TY - JOUR. T1 - Effect of surface treatment on the electron field emission property of nano-diamond films. AU - Lee, Yen Chih. AU - Pradhan, Debabrata. AU - Lin, Su Jien. AU - Chia, Chih Ta. AU - Cheng, Hsiu Fung. AU - Lin, I. Nan. N1 - Funding Information: The authors would like to thank National Science Council, R.O.C. for the support of this research through the project No. NSC 93-2112-M-032-010.. PY - 2005/11. Y1 - 2005/11. N2 - Nano-diamond films having grain size around 20 nm were deposited by bias enhanced growth (BEG) method. Different surface treatments were carried out to increase their field emission properties and their effects are clearly noticed. Surface morphology of different surface treated nano-diamond films was examined. There was no significant change in the curve of Raman spectra of different surface treated samples. Raman spectra were typically of similar nature to nano-diamond film. Field emission results were more interesting. Biased in hydrogen plasma treated ...
A field emission display having an ion pump, for removal of outgassed material, is described. The display has a baseplate and an opposing face plate. A substrate acts as a base for the baseplate. There are parallel, spaced conductors acting as cathode electrodes, over the substrate. An insulating layer covers the cathode electrodes and the substrate, and parallel, spaced conductors act as gate electrodes and overlay the insulating layer. There is a plurality of openings extending through the insulating layer and the gate electrodes. At each of the openings is a field emission microtip connected to and extending up from one of the cathode electrodes. The faceplate has a glass base and is mounted opposite and parallel to the baseplate. A conducting anode electrode covers the glass base. There is a pattern of phosphorescent material over the conducting anode electrode, so that when electrons which are emitted from the field emission microtips strike the pattern of phosphorescent material, light is emitted,
Field electron emission (also known as field emission (FE) and electron field emission) is emission of electrons induced by an electrostatic field. The most common context is field emission from a solid surface into vacuum. However, field emission can take place from solid or liquid surfaces, into vacuum, air, a fluid, or any non-conducting or weakly conducting dielectric. The field-induced promotion of electrons from the valence to conduction band of semiconductors (the Zener effect) can also be regarded as a form of field emission. The terminology is historical because related phenomena of surface photoeffect, thermionic emission (or Richardson-Dushman effect) and cold electronic emission, i.e. the emission of electrons in strong static (or quasi-static) electric fields, were discovered and studied independently from the 1880s to 1930s. When field emission is used without qualifiers it typically means cold emission. Field emission in pure metals occurs in high electric fields: the ...
There is provided a field emission type display which is capable of suppressing deterioration of image quality which otherwise occurs due to stepwise cuts and to the increase of wiring resistance caused by a thin width of a cathode line and which causes less failures. The display includes a plurality of cathode lines having an equal line width within the pixel and is structurally based on a multiple gradation representing a scheme of controlling spatial gradation display by changing the number of field emission type emitters to be driven by changing the number of cathode lines to be selected.
Logos Verlag Berlin, Taryl L. Kirk Near Field Emission Scanning Electron Microscopy, Reihe: Applied Electron Microskopy - Angewandte Elektronenmikroskopie, Bd. 9
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Conjugated polyelectrolyte nano field emission adlayers. . Biblioteca virtual para leer y descargar libros, documentos, trabajos y tesis universitarias en PDF. Material universiario, documentación y tareas realizadas por universitarios en nuestra biblioteca. Para descargar gratis y para leer online.
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High resolution color displays for field emission displays are formed by applying a grille to a screen layer, the grille having a set of holes formed therein exposing areas of the screen layer. A layer of photoresist is applied to the grille and the exposed areas of the screen layer, whereby a plurality of photoresist-covered screen layer areas are defined. One set of the plurality of photoresist-covered screen layer areas is fixed, whereby a fixed set and an unfixed set are defined. The photoresist is removed from the unfixed set and a light emitting substance is deposited on the exposed screen layer area. The fixed set of photoresist is plasma etched.
We report the first observations of field emission/ionisation in liquid helium under pressure. Our preliminary data are presented, and discussed, for pressures, tip potentials and temperatures in the range 0 , P , 25 atm, 0 , V , 3kV, T, 1.5 K.. ...
Looking for interconnecting? Find out information about interconnecting. To attach one device to another. A physical port or wireless port used to attach one device to another Explanation of interconnecting
The first part of this project involves instrumental developments. First, we will demonstrate and characterize laser driven field emission from the customized electron source of a commercial 200kV TEM. The femtosecond cold field emission gun that we have already mounted in a dedicated Ultra High Vacuum (UHV) bench will be completely characterized in terms of brightness, emittance and energy spectrum as a function of laser parameters and extraction voltage. Then, it will be transferred on a TEM column. Its potential for electron microscopy experiments will be thoroughly investigated first on routine TEM applications and later on more demanding experiments. A system allowing light injection and collection on the TEM sample, already installed, will allow us to perform original experiments involving electrons and photons. The principle of an ultrafast TEM is show on the Figure 1. An ultrashort laser pulse excites the sample inserted inside the objective lens. A second laser pulse, delayed, will ...
To create a SEM image a focused primary electron beam scans across a sample surface. Due to the electron bombarding secondary electrons (SE) as well as backscattered electrons (BSE) emit from the sample.. While secondary elecontrons have an energy lower than 50 eV, backscattered electrons show much higher energies.The different electrons are therefore detected by two different, energy selective detectors which convert them into signals, amplifys and visualizes them on a monitor. The result is a tremendously vivid surface image. Since secondary electrons can only be emitted from the surface the resolution of the corresponding image is very good. It ranges between 5 and 10 nm. Backscattered electrons are generated at greater depths. Therefore, the resolution of the corresponding image is significantly lower. SEM have a field depth that is much higher than the one from optical microscopes.. ...
Abstract: It is generally accepted that when multi-component materials are examined with a scanning electron microscope, the contrast differences observed using compositional backscattered electron imaging are due to variations in their average atomic numbers. With increasing atomic number, there is an approximate monotonic increase in backscatter coefficient, which is observed as an increase in the brightness of specimens. However, what seems to be less generally appreciated is that light emitted from cathodoluminescent compounds, especially organic compounds, will also contribute to the brightness in backscattered electron images, and this may result in anomalous compositional contrast. Backscattered electron detectors used with scanning electron microscopes are either a scintillator or a solid state semiconductor and, in addition to detecting high energy backscattered electrons, these detectors also happen to be very sensitive to light. Anomalous contrast had been observed with several ...
The invention is directed to an expandable self-expanding stent for implantation in a body lumen, such as an artery. The stent is made with a plurality of cylindrical elements which are interconnected by a plurality of interconnecting members which connect adjacent cylindrical elements, some of the interconnecting members have one or more bending points formed therein for promoting the bendability of the interconnecting member. The bending point can be formed by reducing the strut wall thickness of the interconnecting member to promote the bending of the strut or it can be formed by reducing the strut width of the interconnecting member, or a combination of both. The bending points on the interconnecting member enhances the bendability and flexibility of the composite stent device by creating mechanical hinges which help to bend the stent as it is delivered through the tortuous anatomy of the patient or conforms to a curved portion of a body vessel, where the stent may be implanted.
The FEI Helios 660 dual-beam microscope combines a monochromated field emission scanning electron microscope (FE-SEM) with an advanced focused ion beam (FIB)
The frequent use of antibiotics against microbial infections may lead the emergence of antibiotic resistant microbial strains. To overcome these microbial strains, we need to fabricate alternative materials which can handle them. It is for this reason, we have fabricated cellulose (CE) based filter paper (FP) composite scaffolds comprising of adsorbed chitosan (CS) and sliver (Ag) nanoparticles (NPs). The AgNPs are incorporated in the CS layer of the composite scaffold. Prior to evaluate the efficacy of the scaffolds against gram positive and gram negative bacterial strains, the scaffolds were characterized for the presence of the Ag NPs with field emission scanning electron microscope (FE-SEM), fourier transform infrared (FTIR) spectroscopy and x-ray diffractometer (XRD ...
The scanning electron microscopy (SEM) image of polyvinylpyrrolidone (PVP) nanofibers electrospun from 15 wt% PVP, 5 wt% wt sucrose in 0.1mg/mL horseradish pero
To enhance our understanding of effects of microbially mediated pyrite dissolution and the influence parameters such as varied metabolism and crystallographic orientation of pyrite surfaces some dissolution experiments were performed. Microbial etching experiments on pyrite surfaces of different orientation, including {111} and {210} were devised. The experiments were performed using two strains ...
In the CrN coating, it can be seen that clear scars were not formed as with the other coatings, instead isolated areas and irregular wear were seen. The dark areas are still coated and the clear areas are where the substrate material has been exposed (figure 8b).. To determine that in some areas the coating was removed it was necessary to test hardness, such as that shown for the steel 4320 with a load of 11.76N (figure 8e), where the wear scar produced by Vickers indentation appears, and whose measurement corresponded to the substrate (700 HV). The SEM micrograph (figure 10c and 10d) shows that wear produced was irregularly shaped in the 4320 steel with a coating of CrN. Figures 10e and 11b show a SEM micrograph and EDS graphic respectively, of 4140 steel with CrN coating, in the first, the clear areas represent removed coating (substrate) and the second shows how the content of Chromium has decreased significantly.. In the WC/C coating, the scar was also produced in a regular form, but ...
Volume I: Principles and Techniques - Provides the foundation for effective use of all particle atlases. It fully describes techniques for particle characterization, handling, and identification and includes detailed presentations of microscope optics, polarized light microscopy, x-ray diffraction camera, and electron and ion microprobes.. Volume II: Light Microscopy Atlas - 711 full-color photomicrographs of 609 particles including complete descriptions in terms of identifying microscopical characteristics. Each particle is also identified morphologically, the vital key to identifying unknown particles with the light microscope.. Volume III: Electron Microscopy Atlas - Shows and describes 1,827 SEM micrographs and EDXRA patterns of the same 609 particles shown in Volume II. This volume details the procedure for the study of samples by both scanning and transmission electron microscopy. This volume includes 27 TEM micrographs and SAED patterns.. Volume IV: The Particle Analysts Handbook - 356 ...
Interconnecting Cisco Network Devices, Part 2 (ICND2) by Stephen McQuerry, 9781587054631, available at Book Depository with free delivery worldwide.
Abstract: A typical dual-beam platform combines a focused ion beam (FIB) microscope with a field emission gun scanning electron microscope (FEGSEM). Using FIB-FEGSEM, it is possible to sequentially mill away > ~ 50 nm sections of a material by FIB and characterize, at high resolution, the crystallographic features of each new surface by electron backscatter diffraction (EBSD). The successive images can be combined to generate 3D crystallographic maps of the microstructure. A useful technique is described for FIB milling that allows the reliable reconstruction of 3D microstructures using EBSD. This serial sectioning technique was used to investigate the recrystallization behaviour of a particle-containing nickel alloy, which revealed a number of features of the recrystallizing grains that are not clearly evident in 2D EBSD micrographs such as clear evidence of particle stimulated nucleation (PSN) and twin formation and growth during PSN ...
Development of docetaxel nanocrystals surface modified with transferrin for tumor targeting Jin-Seok Choi, Jeong-Sook Park College of Pharmacy, Institute of Drug Research and Development, Chungnam National University, Yuseong-gu, Daejeon, South Korea Abstract: The purpose of this study was to develop the surface modification of docetaxel nanocrystals (DTX-NCs) with apo-Transferrin human (Tf) for improving the cellular uptake and cytotoxicity of DTX. DTX-NCs were prepared by a nanoprecipitation method, and the surface modified with Tf by an adsorption method (Tf-DTX-NCs). The morphology and particle size of DTX-NCs and Tf-DTX-NCs were characterized using a field emission scanning electron microscope and zetasizer. An in vitro drug release study was performed in phosphate-buffered saline containing 0.5% (w/v) Tween 80 for 24 hours. Cellular uptake was studied at 0.5, 1, and 2 hours. A cytotoxicity study was performed using the A549 (human lung cancer) cell line after 24-, 48-, and 72-hour
Learn about the newly expanded ZEN technology and new Correlative Microscopy in this interview with John B Yorston, Carl Zeiss. Capabilities of the Sigma VP Field Emission Scanning Electron Microscope are demonstrated and the LSM 700 Scanning Confocal Microscope is shown. These systems combine ultra-resolution with labelling capabilities for a turn-key solution called Shuttle and Find. Filmed by SelectScience at ASCB 2011.
Usually expensive filters and chemicals are used to image bacteria through high resolution scanning electron microscope (Field emission). The substrate developed by this Institute can be used as an ideal, cheap and better substitute of these materials. This technology can be transferred within three months on exclusive basis.. ...
The FEI Quanta 200 ESEM scanning electron microscope is pre-owned and remanufactured to OEM specifications. Click in for more on the scope specs.
SEM images of the fabricated scaffolds (A and B) and the commercial product from BD Bioscience (C). A: HT63, composed the combination of HA and TCP at a 2:1 mas
In one aspect, the invention includes a method of patterning a substrate. A film is formed over a substrate and comprises a plurality of individual molecules. The individual molecules comprise two ends with one of the two ends being directed toward the substrate and the other of the two ends being directed away from the substrate. Particle-adhering groups are bound to said other of the two ends of at least some of the individual molecules and a plurality of particles are adhered to the particle-adhering groups to form a mask over the substrate. The substrate is etched while the mask protects portions of the substrate. In another aspect, the invention encompasses a method of forming a field emission display. A material having a surface of exposed nitrogen-containing groups is formed over the substrate. At least one portion of the material is exposed to radiation while at least one other portion of the material is not exposed. The exposing renders one of the exposed or unexposed portions better at bonding
CHINA SCIENCE AND TECHNOLOGY NEWSLETTER T h e M i n i s t r y o f S c i e n c e a n d T e c h n o l o g y P e o p l e s R e p u b l i c o f C h i n a I N T H I S I S S U E * Six Goals for Space Development * China-Korea Joint Marine Study * China: Largest GEF Recipient * World First GM Cassava * 25-inch VGA Field Emission Display Chinese State Development and Reform Commission an ...
A médiaszakembereknek készített heti eseménynaptár segítségével tájékozódjon az Európai Parlament várható tevékenységeiről.
Gel Serum - All Skin Types - HYDRATION. The Zone Super Smoother is an anti-ageing gel serum, designed to smooth the skins surface, and impart essential moisture into the skin. This formulation boasts a Dual Hyaluronic Action, utilising two different analogues of Hyaluronic Acid for advanced penetration into the skin, which provides unparalleled moisturising capabilities, applying the latest technology in the highest concentrations. Provides immediate and long term ultimate dermal and epidermal moisturisation and plumping but without any oiliness. The serum dries quickly leaving skin feeling tighter, looking smoother.. Super Smoother enhances the action of injectable fillers that are used to plump out wrinkles. A light, cooling Gel Serum formulation that ideally adds a perfect balance of moisture required to feed the dermis and epidermis but without any oily feel. A must for most skins, particularly beneficial for adult acne sufferers as it provides essential moisture but without any oiliness. ...
Scanning Electron Microscopy image of carbon dioxide sequestered in treated serpentine minerals. Crystals shown here are primarily nesquehonite. ...
The present invention describes a patch panel unit including an interface for connecting the patch panel with an electrical node and first and second ports for receiving patch cord connectors. A switch interconnects the first interface with the first and second ports such than when a connector is placed only within the first port, an active connection is provided between the interface and the first port. When a connection is placed within the second port, an active connection is provided between the second port and the first interface despite whether a connection is provided with the first port.
An active switching mechanism is used for diverting paper sheets from a first area (A) to either possible paths (ab or ac). The sheets along the first path (ab) can be directly conveyed to a second area (B), and the sheets along the second path (ac) can be directed through a passive switching mechanism (4) to a third area (C), the direction of the moving sheets being reversed through a reversing mechanism, thereby enabling said sheets to be conveyed in the reverse direction from the third area (C) along a third path (cb) to the second area (B), using a passive switching device (4).
در این پژوهش، امکان به کارگیری پایه های زئولیتی و تاثیر نوع های گوناگون آن بر روی ویژگی های کاتالیستی و عملکرد راکتوری نانوکاتالیست کروم اکسید برای استفاده در فرایند هیدروژن گیری اکسایشی اتان به کمک کربن دی اکسید مورد ارزیابی قرار گرفت. در این راستا، شماری از کاتالیست های کروم اکسید دارای 4/3 % وزنی کروم با تلقیح پایه های زئولیتی انتخاب شده کلینوپتیلولیت، SAPO-34 و HZSM-5 تهیه شدند. بدین منظور، کلینوپتیلولیت خریداری شد و پایه های SAPO-34 و HZSM-5 به روش هیدروترمال تهیه شدند که آنالیزهای XRD، FESEM، BET و EDX تهیه موفقیت آمیز آن ها را تایید کردند. تصویرهای FESEM تشکیل کلوخه های ...
OAK RIDGE, Tenn., Jan. 31, 2019-A new electron microscopy technique that detects the subtle changes in the weight of proteins at the nanoscale-while keeping the sample intact-could open a new pathway for deeper, more comprehensive studies of the basic building blocks of life. ...
Easy to cut and apply, this Weather Strip Tape has a self-adhesive back and is compatible with all types of Silicone Sealants. It will withstand a high level of movement and will conform to irregular surfaces. It resists cracking, is durabble and long-lasting ...
ABSTRACT-In evaluating the effectiveness of consolidants for limestone, difficulty is encountered in the determination of the depth of penetration of consolidants. A simple procedure using iodine vapor for visualizing penetration depth is described. The technique is compared with other methods, such as fluorescent dye indicators, elemental analysis, scanning electron microscopy (SEM) observation, charring in an inert atmosphere, and acid etching, for effectiveness, applicability, and suitability. ...
S of the S8DclpP mutant show increased cell volume and rougher, more irregular surfaces. Preparation of samples was performed as described in Materials and
کاهش بازتابش لیزر به عنوان یک پدافند مؤثر برای محافظت از افراد و تجهیزات حساس حایز اهمیت است. مهم‌ترین استراتژی برای کاهش آسیب‌های تابش لیزر، کاهش میزان بازتابش آن از سطوح است. در این تحقیق از روش‌های ایجاد تخلخل در ساختار رنگدانه برای دستیابی به پایین‌ترین درصد بازتابش و ساخت پوشش‌های ضدبازتاب لیزر استفاده شده است. رنگدانه‌های کربنی متخلخل CMK-1 و CMK-3 تهیه شده و با روش‌های XRD، FE-SEM و DR-UV-Vis-NIR ارزیابی شدند. پوشش حاوی این رنگدانه‌ها روی بستر آلومینیمی اعمال شد و خواص عمومی رنگ و طیف بازتابش پراکنده آنها مورد بررسی قرار گرفت. در نهايت میزان بازتابش آن در برابر
230x350 cm., with 2 femoral adhesive fenestrations of 7x5 cm. Two adhesive areas of 16x16 cm., fenestration of 12,5 cm. and opened incise area of 7,5 cm. Ø (fenestration of ø 7x10 cm. for standart). Transparent lateral panels in both sides of patient and both lateral side reinforced zones. Cat. № 16140600 ...
OsteoAnchor is a new type of surface architecture for improving the lifespan for patients of cementless orthopaedic implants, such as hip and knee replacements.. Download Brochure ...
Energy dispersive X-ray spectroscopy (EDS) Wavelength dispersive X-ray spectroscopy (WDS) 1thickness analysis of thin films by energy dispersive x-ray spectroscopy a thesis submitted to the graduate school of natural and applied sciencesFoot District - tu tienda online de zapatillas. La mejor selección de nike, adidas, NB y muchas otras más. Envío Gratis. Entrega al día siguiente.Energy-Dispersive X-Ray Spectroscopy (EDS) John Goodge, University of Minnesota-Duluth. Interaction of an electron beam with a sample target produces a variety of .edsonsemprimer.pdf - Download as . Energy Dispersive Spectroscopy . The probability of absorption then increases again as the X-ray energy approaches the .CHAPTER 16 X-ray Spectroscopy by Manne Siegbahn 16.1.Energy Dispersive X-Ray Spectroscopy (EDS) Detector . State-of the Art Ethernet X ray Electronic interface 10/100 megabits per .High-resolution X-ray emission spectroscopy with transition-edge sensors: . Download Paper . DOI Link. Keywords . X-ray ...
Field emission properties of single wall carbon nanotubes (SWCNTs) grown on iron catalyst film by plasma enhanced chemical vapour deposition system were studied in diode configuration. The results were analysed in the framework of Fowler-Nordheim theory. The grown SWCNTs were found to be excellent field emitters, having emission current density higher than 20 mA/cm{sup 2} at a turn-on field of 1.3 V/μm. The as grown SWCNTs were further treated with Oxygen (O{sub 2}) plasma for 5 min and again field emission characteristics were measured. The O{sub 2} plasma treated SWCNTs have shown dramatic improvement in their field emission properties with emission current density of 111 mA/cm{sup 2} at a much lower turn on field of 0.8 V/μm. The as grown as well as plasma treated SWCNTs were also characterized by various techniques, such as scanning electron microscopy, high resolution transmission electron microscopy, Raman spectroscopy, and Fourier transform infrared spectroscopy before and after O{sub ...

Energy dispersive X-ray spectroscopy (EDS) Wavelength dispersive X-ray spectroscopy (WDS) 1thickness analysis of thin films by energy dispersive x-ray spectroscopy a thesis submitted to the graduate school of natural and applied sciencesFoot District - tu tienda online de zapatillas. La mejor selección de nike, adidas, NB y muchas otras más. Envío Gratis. Entrega al día siguiente.Energy-Dispersive X-Ray Spectroscopy (EDS) John Goodge, University of Minnesota-Duluth. Interaction of an electron beam with a sample target produces a variety of .edsonsemprimer.pdf - Download as . Energy Dispersive Spectroscopy . The probability of absorption then increases again as the X-ray energy approaches the .CHAPTER 16 X-ray Spectroscopy by Manne Siegbahn 16.1.Energy Dispersive X-Ray Spectroscopy (EDS) Detector . State-of the Art Ethernet X ray Electronic interface 10/100 megabits per .High-resolution X-ray emission spectroscopy with transition-edge sensors: . Download Paper . DOI Link. Keywords . X-ray ...
18 inch complete CNT-FED (Carbon Nanotubes Field Emission Device Technology), Model: FED-18, 18 inch complete CNT-FED (Carbon Nanotubes Field Emission Device Technology) : Granting customers whole new visible effect and showing high quality image & see-through superiority, improving the expe...
This report focuses on the design, fabrication and characterization of vacuum field emission (VFE) devices, specifically on the triode and integrated differential amplifier (diff-amp), utilizing CNTs synthesized by microwave plasma chemical vapor deposition in conjunction with semiconductor microfabrication methods. A consistent and reproducible CNTs synthesis method comprised of plasma pretreatment of the catalysts prior to CNT synthesis was developed to tailor the surface profile of vertically aligned CNTs. CNT triode arrays with a well-controlled convex-shaped emitter profile, designed for optimum field emission, were fabricated and their dc and ac performance evaluated. The triodes demonstrated good transistor characteristics with distinct linear, saturation and cutoff regions of operation. The triode amplifier achieved a low gate turn-on of ~16 V, high current density of ~7 A/cm2, high amplification factor of |400, and a projected 50 dB gain at cutoff frequency of ~26 MHz and 20 dB gain at 1 GHz.
The field emission (FE) properties of sigle-walled carbon nanotubes (SWNTs) are of great importance, especially in applications involving flat panel displa
In this paper, we propose a model of spatial confinement quantization of electron states and of tunneling field emission from these states. The model can a
BioAssay record AID 724374 submitted by ChEMBL: Induction of morphological changes in human erythrocytes at => 60 uM after 1 hr by cold field emission scanning electron microscopic analysis.
Recently, research has established a screening system comprising a combination of two technologies, the MEMS sensor and the field and laboratory emission cell (FLEC), to perform experiments. The aim of our study was to establish MEMS sensor field emission cell technology (MS-FECT) to measure the changes in the pollutant concentration of field emission cells. A building material emission database was created via an Internet of Things (IoT) in order to develop a MEMS sensor field emission modeling platform. Based on the basic information of the building material emission database, and emission and decay models, in this system the MS-FECT, IoT, indoor positioning system (Beacon), and cloud database are integrated. The source of pollution was determined by sensing and data analysis to create a multidimensional map of pollution sources to determine air quality in order to monitor the location of pollutants and flow conditions in the long term to change the indoor air quality efficiently. Moreover, ...
The ability to pattern in the nanoscale to drill holes, to draw lines, to make circles, or more complicated shapes that span a few atoms in width is the main driver behind current efforts in the rapidly growing area of nanomanufacturing. In applications ranging from the microprocessor industry to biomedical science, there is a constant need to develop new tools and processes that enable the shrinking of devices. For this and more applications, nanomanufacturing using electron beams offers a window of opportunity as a top-down approach since electrons, unlike light, have a wavelength that is in the order of the atomic distance. Though the technology based on electron beams has been available for more than twenty years, new concepts are constantly being explored and developed based on fundamental approaches. As such, a tool that utilizes electron field-emission from carbon nanotubes was proposed to accomplish such feats. A full numerical analysis of electron field-emission from carbon nanotubes for
David Nam, Judith Mantell, David Bull, Paul Verkade, Alin Achim. The following work presents a graphical user interface (GUI), for automatic segmentation of granule cores and membranes, in transmission electron microscopy images of beta cells. The system is freely available for academic research. Two test images are also included. The highlights of our approach are:. ...
The opportunities of the hot wall aerosol synthesis, i.e. conventional spray pyrolysis (CSP) method are demonstrated for the generation of highly spherical three-dimensional (3D) nanostructured phosphor particles with uniformly distributed components, phases a The opportunities of the hot wall aerosol synthesis, i.e. conventional spray pyrolysis (CSP) method are demonstrated for the generation of highly spherical three-dimensional (3D) nanostructured phosphor particles with uniformly distributed components, phases and nano-clustered inner structure. With the presumption that certain particle morphology is formed during the evaporation/drying stage, the aerosol transport properties and powder generation are correlated with the particles structural and morphological features. With the help of various analyzing techniques like Field Emission Scanning Electron Microscopy (FE-SEM), Transmission Electron Microscopy (TEM) coupled with energy dispersive X-ray Analysis and STEM mode (TEM/EDS), X-ray ...
This paper reports a change of carbon nanotubes(CNTs) properties by post-treatment process after growth of CNTs. CNTs were treated by thermal method and solution method, and then investigated in detail using field emission scanning electron microscopy(FE-SEM), high resolution transmission scanning e...
Natural chalcopyrite (CuFeS2) specimens from Golden, New Mexico and Transvaal, South Africa were examined by transmission electron microscopy. The defect structure was composed of dislocations,...
This study focuses on the fabrication and electrical characterization of a polymer composite based on nano-sized varistor powder. The polymer composite was fabricated by the melt-blending method. The developed nano-composite was characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), field emission scanning electron microscopy (FeSEM), and energy-dispersive X-ray spectroscopy (EDAX). The XRD pattern revealed the crystallinity of the composite. The XRD study also showed the presence of secondary phases due to the substitution of zinc by other cations, such as bismuth and manganese. The TEM picture of the sample revealed the distribution of the spherical, nano-sized, filler particles throughout the matrix, which were in the 10-50 nm range with an average of approximately 11 nm. The presence of a bismuth-rich phase and a ZnO matrix phase in the ZnO-based varistor powder was confirmed by FeSEM images and EDX spectra. From the current-voltage curves, the non-linear coefficient of
Even small amounts of amorphous materials can have a significant effect on the drug product. Are gravimetric vapour sorption techniques an effective solution to characterize amorphous materials?
Supplément au Journal de Physique Colloques, Journal de Physique Archives représente une mine dinformations facile à consulter sur la manière dont la physique a été publiée depuis 1872.
EBSD is a method for determining the crystallographic orientation of mineral or metal grains relative to one another in a polished thin section. The technique can be used to determine preferred orientations among minerals produced by crystallization and deformation processes.. The method is based on backscattered electrons being channelled by crystalline lattice planes when the angle of an incident electron beam is near 30 degrees (sample tilt 70 degrees). The resulting emission presents an image with a pattern that is characteristic of the minerals crystallography, and which can be captured by a digital camera. The variety of angles within the image, together with the locations where the bands meet (poles) are indicative of the crystals symmetry and orientation. The band widths are a measure of the crystal d-spacing - however the EBSD technique is not as sensitive to d-spacing measurement as is traditional x-ray diffraction. For mineral identification, EBSD can only be used together with ...
TY - JOUR. T1 - A Scanning Electron Microscope Study of the Structural Component of the Bovine Vaginal Fluid at Oestrus. AU - Rutllant, J.. AU - López-Gatius, F.. AU - Camón, J.. AU - López-Plana, C.. AU - López-Béjar, M.. PY - 1997/6/1. Y1 - 1997/6/1. N2 - The ultrastructure of the vaginal fluid of cows at oestrus was analysed by scanning electron microscopy. Samples of vaginal fluid were collected from 7 normally cycling and healthy cows, 3 to 4 years of age, in oestrus. Evaluation of the patterns of crystallization was used as a previous assessment of the quality of the samples. SEM images revealed a structure made up of non-oriented filaments constituting a network with a three-dimensional arrangement. These filaments were of different diameters and ranged between 50 and 400 nm. Mesh size, defined as the minimum distance measurement between strands, ranged between 2 to 8 μm.. AB - The ultrastructure of the vaginal fluid of cows at oestrus was analysed by scanning electron microscopy. ...
The vasculature, made up of vessels of different morphology and function, distributes bloodstream to all or any tissues and maintains physiological tissue homeostasis. endothelial cells present specific morphological features that reveal the necessity for communication between your organs as well as the blood flow. In the mind, the vasculature forms an especially strong hurdle, the bloodCbrain hurdle (BBB) (5), to safeguard the mind parenchyma from harmful edema. In hormone-producing organs, like the endocrine pancreas, endothelial cells screen specific fenestrae on the surface. They are diaphragm-covered openings in the plasma membrane, which enable extremely fast exocytosis of human hormones (6). Generally in most organs, the endothelial cells type a dynamic hurdle between the bloodstream and the tissues. In resting circumstances, the vasculature regularly leakages solute and little substances but restricts extravasation of bigger substances and cells. In lots of diseases, including tumor and ...
The Museums Ultra Plus scanning electron microscope is suitable for high-resolution imaging of biological and non-biological specimens.
The electron microscope is relatively larger and uses a vacuum and electrons to produce a high quality image, by sending electrons through the tiny gaps. (An anode is there to speed it up). This gives an advantage to the electron microscope, a better resolution. As a result if any person wants to see something such as the mitochondrion, the Golgi Body or even a lysosome they are able to. It magnifies up to 200,000 times, which is a huge amount!. There are two types of electron microscope, the Scanning Electron Microscope [SEM] and the Transmission Electron Microscope [TEM]. Scanning Electron Microscope shows the external and whole image of a specimen such as a dust mite, or a nit. The Transmission Electron Microscope is literally the opposite. It gives the image from the interior. These are very exciting options as they give an overview of the entire specimen in question and we are able to study them in great detail and depth.. ...
Although multiple charging in electrospray ionization (ESI) is essential to protein mass spectrometry, the underlying mechanism of multiple charging has not been explicated. Here, we present a new theory to describe ESI of native-state proteins and predict the number of excess charges on proteins in …
The scanning electron microscopy service, equipped with a QUANTA FEI 200 FEG-ESEM offers a powerful imaging tool for both, routine and advanced inspection of materials. The service is intended to offer high resolution facilities (1.2nm @30kV) with a field emission gun, specially suited for the morphological characterization of nanocrystals, nanostructured materials and surfaces. Image contrast proportional to the atomic number is also available with high lateral resolution (2.5 nm @30kV) using an electron backscattered detector. The instrument can be used in high vacuum mode, low-vacuum mode (the chamber pressure is monitored by water vapour injection), and environmental SEM mode (ESEM). This makes possible to study samples in pressures up to 5 Torr. The resolution is kept high at all conditions: 1.2 nm and 1.5 nm at 30kV in the high and low vacuum modes, respectively. The capability to vary the chamber pressure is specially suited for the observation of uncoated non-conducting materials. The ...
Calcium sulfate-bioactive glass (CSBG) composites doped with 5, 10 and 20 mol% Fe were synthesized using quick alkali sol-gel method. X-ray diffraction (XRD) data of samples heated at 700°C revealed the presence of anhydrite, while field emission scanning electron microscopy (FESEM) and energy dispersive X-ray (EDX) characterization confirmed the formation of nano-sized CSBGs. The UV-vis studies confirmed that the main iron species in 5% Fe and 10% Fe doped CSBGs were tetrahedral Fe(III) whereas that in 20% Fe doped CSBG were extra-framework FeOx oligomers or iron oxide phases. Measurement of magnetic properties of the samples by vibrating sample magnetometer (VSM) showed very narrow hysteresis loop with zero coercivity and remanence for 10% Fe and 20% Fe doped CSBG, indicating that they are superparamagnetic in nature. All samples induced the formation of apatite layer with Ca/P ratio close to the stoichiometric HA in simulated body fluid (SBF) assessment. ...
360\,{\text {cm}}^{-1}\) ). Mapping the distribution of FWHM (Fig.? 4 d-f) reveals an overall broadening of the vibrational bands in the laser modified regions with respect to the pristine bulk material. This indicates amorphisation within the structures. The lattice vibrations at $$201.5\,{\text {cm}}^{-1}$$ and $$123.8\,{\text {cm}}^{-1}$$ exhibit the strongest broadening in the core region. In contrast, the internal vibration at $$361.5\,{\text {cm}}^{-1}$$ only features a marginal bandwidth increase in both core and shell. Changes in bandwidths are more pronounced in comparison to peak shifts, which indicates that amorphisation is one of the key initiator for waveguide formation. The field-emission backscattered electron (BSE) image, which gives contrast based on atomic number (Z-contrast) of the same 1,000?mm/min, 90?nJ waveguide reveals strong elemental variation across the waveguides cross-section (Fig.? 5 ). The shell region (bright boundary) shows an increase in heavy elements, whereas ...
Lanthanum nickelate (LNO) is a perovskite oxide material with metallic conductivity in a wide temperature range which makes it suitable for application as electrode material for thin films. In this paper LNO thin films were prepared by polymerizable complex method from the diluted citrate solutions. Precursor solutions were spin coated onto Si-substrates with amorphous layer of SiO2. Deposited layers were thermally treated from the substrate side with low heating rate (1 °/min) up to 700 °C and finally annealed for 10 hours. Results of AFM and FESEM showed that films are very smooth (Ra = 4 nm), dense, crack-free and with large square-shaped grains (170 nm). According to FESEM and TEM results the obtained four-layered film was only 65 nm thin. EBSD and XRD analyses confirmed polycrystalline microstructure of the films without preferential orientation. It was concluded that the presence of SiO2 layer on Si substrate prevents epitaxial or oriented growth of LNO.
Fe-W coatings with 4, 16 and 24 at.% of W were electrodeposited under galvanostatic conditions from a new environmental friendly Fe(III)-based glycolate-citrate bath. This work aims to find correlations between composition including the light elements, internal structure of the electrodeposited Fe-Walloys and functional properties of material. The obtained alloys were characterized by Glow Discharge Optical Emission Spectrometry (GD-OES), Scanning Electron Microscopy (SEM) with Energy Dispersive X-ray Spectroscopy (EDS), Transmission Electron Microscopy (TEM), and X-ray Diffraction (XRD). Compositional depth profiles of 10 mm thick coatings obtained by GD-OES show that the distribution of metals is uniform along the entire film thickness, while SEM imaging depicted the presence of cracks and O- and W-rich areas inside the Fe-Wcoating with 4 at.% W. In the samples with 16 and 24 at.% of W, oxygen and hydrogen are present mostly at the surface about 1 mm from the top while traces of carbon are
Objective(s): This work focuses on preparing an efficient bacterial capture system based on the magnetic polyphenolic nanostructure. For a reason, a one-step hydrothermally route was employed to prepare [email protected] acid - resorcinol nanohybrid. Methods: The nanostructure was characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM) vibration sample magnetometry (VSM) and zeta potential measurement. Bacillus subtilis was employed as a sample pathogen to evaluate bacterial capture efficiency of the nanohybrid. Results: Characterization results confirmed that the hybrid material is in nano scale. Moreover, it has a magnetic saturation of 6.7 emu g-1 which is in right level to be employed for magnetic separation. Effect of relevant variables on capturing efficiency including pH, contact time and adsorbent dosage was investigated, and optimum levels were obtained. Conclusions: It found that the capturing efficiency is
The scanning electron microscopy service, equipped with a QUANTA FEI 200 FEG-ESEM offers a powerful imaging tool for both, routine and advanced inspection of materials. The service is intended to offer high resolution facilities (1.2nm @30kV) with a field emission gun, specially suited for the morphological characterization of nanocrystals, nanostructured materials and surfaces. Image contrast proportional to the atomic number is also available with high lateral resolution (2.5 nm @30kV) using an electron backscattered detector. The instrument can be used in high vacuum mode, low-vacuum mode (the chamber pressure is monitored by water vapour injection), and environmental SEM mode (ESEM). This makes possible to study samples in pressures up to 5 Torr. The resolution is kept high at all conditions: 1.2 nm and 1.5 nm at 30kV in the high and low vacuum modes, respectively. The capability to vary the chamber pressure is specially suited for the observation of uncoated non-conducting materials. The ...
Electrical properties of n-Si/n-Si, p-Si/n-Si, and p{sup −}-Si/n{sup +}-Si junctions fabricated by using surface-activated-bonding are investigated. The transmission electron microscopy/energy dispersive X-ray spectroscopy of the n-Si/n-Si interfaces reveals no evidence of oxide layers at the interfaces. From the current-voltage (I-V) and the capacitance-voltage (C-V) characteristics of the p-Si/n-Si and p{sup −}-Si/n{sup +}-Si junctions, it is found that the interface states, likely to have formed due to the surface activation process using Ar plasma, have a more marked impact on the electrical properties of the p-Si/n-Si junctions. An analysis of the temperature dependence of the I-V characteristics indicates that the properties of carrier transport across the bonding interfaces for reverse-bias voltages in the p-Si/n-Si and p{sup −}-Si/n{sup +}-Si junctions can be explained using the trap-assisted-tunneling and Frenkel-Poole models, respectively. ...
Read the latest amorphous materials journal articles on Materials Today: the gateway for amorphous research, journal articles and more.
Glass-nanocomposites of compositions xAgI − (1 − x)(0.40Ag2O-0.60SeO2) for 0.15 ≤ x ≤ 0.30 were prepared by quenching the melt of the appropriate mixtures of the chemicals AgI, AgNO3 and SeO2. Differential scanning calorimetry (DSC) was employed to determine the glass transition and crystallization temperatures. The as-prepared samples were heat-treated above glass transition temperature to observe the growth of nanoparticles. X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM) were used to explore the microstructure of these samples. These studies revealed the presence of β-AgI and Ag2SeO3 nanocrystals in both the as-prepared and heat-treated samples. The particle size was found to decrease with the increase of AgI content in both cases. The heat-treated samples showed increased tendency of crystallization for the compositions with higher AgI content. The β-α phase transition of AgI crystals was observed at ...
NANOTEM is an open TEM facility located at C2N, which is devoted to the development of nanosciences on the Plateau de Saclay campus. The NANOTEM facility is equipped with a Cs-corrected FEI-THEMIS and a high efficiency EDX detector allowing atomic-scale chemical mapping, plus a FEI- SCIOS focused ion beam machine (FIB) dedicated to fabricating TEM samples.. ...
View details for this PhD Studentship: Understanding Battery Chemistry with In-situ Electron Microscopy job vacancy at University of Oxford in...
Marshak Science Building: The 360,000 sq. ft. Robert E. Marshak Science Building is located in the heart of the CCNY campus and houses various research facilities, laboratories, and equipment. CDI (Center for Discovery and Innovation) Science Building: The CDI building which opened in 2015, has 200,000 square feet of space for advanced research. Imaging Core Facility: State-of-the art microscopes are available in the imaging core facility at Marshak and can be easily reserved for use for a moderate fee. A Zeiss LSM 710 scanning confocal microscope, a Zeiss LSM 800 and a Zeiss 880 Airyscan confocal microscopes, an Ultima 4 multiphoton microscope, and a Nikon N-STORM super-resolution microscope with TIRF, are available in Marshak. Also available in the Marshak building are two electron microscopes; a Jeol JEM2100 200 kV Transmission Electron Microscope (TEM) with a maximum resolution of 0.144 nm and a Zeiss Supra 55VP Field Emission Scanning Electron Microscope (SEM) that has a maximum resolution ...
The frequent use of antibiotics against microbial infections may lead the emergence of antibiotic resistant microbial strains. To overcome these microbial strains, we need to fabricate alternative materials which can handle them. It is for this reason, we have fabricated cellulose (CE) based filter paper (FP) composite scaffolds comprising of adsorbed chitosan (CS) and sliver (Ag) nanoparticles (NPs). The AgNPs are incorporated in the CS layer of the composite scaffold. Prior to evaluate the efficacy of the scaffolds against gram positive and gram negative bacterial strains, the scaffolds were characterized for the presence of the Ag NPs with field emission scanning electron microscope (FE-SEM), fourier transform infrared (FTIR) spectroscopy and x-ray diffractometer (XRD ...
TY - JOUR. T1 - Red cell fragmentation in human disease (a light and scanning electron microscope study). AU - Young, T. W.. AU - Keeney, Gary. AU - Bull, B. S.. PY - 1984. Y1 - 1984. N2 - Although the mechanism of schizocyte formation has been amply documented in animal experiments and in in-vitro models, the fragmentation encounter between flowing red cells and fibrin strands has not previously been successfully demonstrated in human, microangiopathic disease. If blood flow is restored briefly in vitro immediately prior to tissue fixation, the instant of red cell fragmentation can be captured. Examination of tissue specimens fixed in this manner shows a pathophysiologic process that amplifies the findings previously described in other studies. In the patient under study, the microangiopathic process was widespread in all specimens of pulmonary and renal tissue that had been fixed after brief restoration of blood flow. Small arteries as well as the true microcirculation of both organs were ...
Correlative light and electron microscopy is an imaging technique that enables identification and targeting of fluorescently tagged structures with subsequent imaging at near-to-nanometer resolution. We established a novel correlative cryo-fluorescence microscopy and cryo-scanning electron microscopy workflow, which enables imaging of the studied object of interest very close to its natural state, devoid of artifacts caused for instance by slow chemical fixation. This system was tested by investigating the interaction of the zoonotic bacterium Borrelia burgdorferi with two mammalian cell lines of neural origin in order to broaden our knowledge about the cell-association mechanisms that precedes the entry of the bacteria into the cell ...
Mechanical alloying of binary and ternary elemental powder mixtures with the nominal compositions of Mg2Ni and Mg(2-x)MnxNi (x= 0, 0.05, 0.10 and 0.15 at. %) were carried out in a planetary ball mill for various milling times of 5, 10, 15, 20, 30 and 60 h. X-ray diffraction and field emission scanning and transmission electron microscopy were used for the characterization of the milled products. Clusters of Mg2Ni-based nano-crystals were produced after 10 h of milling using the binary powder mixture. However, the formation kinetic of Mg2Ni-based structure was found to increase by increasing Mn content. In addition, Mn was found to decrease Mg2Ni crystallite size during milling; a mean Mg2Ni crystallite size of ~6 nm was achieved by high energy ball milling of the initial ternary powder mixture of Mg1.85 Mn0.15Ni after 60h. The milled product consisted of Mg2Ni-based crystallites surrounded by amorphous regions. Addition of Mn to Mg2Ni resulted in increased electrode discharge capacity of the ternary Mg
This application seeks support for continued development of EMAN, an extensive image processing suite for electron microscopists. Structural biology is the stud...
Adsorption processes are responsible for detection of cancer biomarkers in biosensors (and immunosensors), which can be captured with various principles of detection. In this study, we used a biosensor made with nanostructured films of polypyrrole and p53 antibodies, and image analysis of scanning e …
Cuprous oxide nanoclusters, microcubes and microparticles were successfully synthesized by a simple co-precipitation method. Phase purity and crystallinity of the samples were studied by using X-ray powder diffraction. Transmission electron microscopy (TEM) images show different morphologies like nanoclusters, microcubes and microparticles. For linear and nonlinear optical measurements, the as-synthesized Cu2O with different morphologies were dispersed in isopropanol solution. The absorption spectrum recorded in the visible regions shows peaks that depend on the morphology of the particles and the peak shifts towards red region as one goes from nanoclusters to microparticles. Simple open-aperture Z-scan technique is used to measure nonlinear optical properties of cuprous oxide at 532 nm, 30 ps excitation at 10 Hz repetition rate. Cuprous oxide nanoclusters show reverse saturable absorption (RSA) behaviour, the microcubes and microparticles at a similar concentration exhibit saturable absorption ...
A new pyrene-phosphonate colorimetric receptor 1 has been designed and synthesized in a one-step process via amide bond formation between pyrene butyric acid chloride and phosphonate-appended aniline. The pyrene-phosphonate receptor 1 showed aggregation-induced enhanced emission (AIEE) properties in water/acetonitrile (ACN) solutions. Dynamic light scattering (DLS) characterization revealed that the aggregates of receptor 1 at 80% water fraction have an average size of ≈142 nm. Field emission scanning electron microscopy (FE-SEM) analysis confirmed the formation of spherical aggregates upon solvent evaporation. The sensing properties of receptor 1 were investigated by UV-vis, fluorescence emission spectroscopy, and other optical methods. Among the tested metal ions, receptor 1 is capable of recognizing the Fe3+ ion selectively. The changes in spectral measurements were explained on the basis of complex formation. The composition of receptor 1 and Fe3+ ions was determined by using Jobs plot and found