Polyacrylonitrile/Nafion®/carbon nanotube (PAN/Nafion®/CNT) composite nanofibers were prepared using electrospinning. These electrospun nanofibers were studied as possible substrates for surface-assisted laser desorption/ionization (SALDI) and matrix-enhanced surface-assisted laser desorption/ionization time
In this paper, we report on the functionalization of silicon nanostructured (NanoSi) surface with an organic layer of nitrilotriacetic acid (NTA) and its subsequent use as an affinity surface-assisted laser desorption/ionization mass spectrometry (SA
TY - JOUR. T1 - Magneto-optical properties and size effect of ferromagnetic metal nanoparticles. AU - Kaihara, Terunori. AU - Mizuguchi, Masaki. AU - Takanashi, Koki. AU - Shimizu, Hiromasa. PY - 2013/1/1. Y1 - 2013/1/1. N2 - We investigated the magneto-optical (MO) effect with localized surface plasmon resonance (LSPR) on ferromagnetic metal (Fe and Co) nanoparticles. We estimated the electric-field enhancement of the ferromagnetic metal nanoparticles caused by LSPR based on Mie scattering theory and compared it with that of Au nanoparticles. The electric-field enhancement of the ferromagnetic metal nanoparticles was 15-17, which is half of that of the Au nanoparticles. In order to explain the calculated results, we prepared ferromagnetic metal nanoparticles by a self-assembly process. We measured the optical transmission spectra and Faraday effect of the ferromagnetic nanoparticles. Although remarkable MO enhancement was not observed, we found characteristic MO spectra and a peak shift at ...
The synthesis of noble metal nanoparticles (i.e., silver and gold) for electrochemical applications has been widely studied using mainly wet synthesis chem
download from bioimaging to biosensors noble metal nanoparticles CELL DISEASE AFFECTS PHYSICAL GROWTHR. PANCHALI TARAFDER, KAUSHIK SARKAR, PARTHA P. COMPRISING OF PSEUDOMONAS AND PAENIBACILLUS CELLS, ON THE neighborhood OF properties. audience AND nativity OF DIFFERENT FORMULATIONS OF PSEUDOMONAS FLUORESCENS number FOR THE aut OF PLANT GROWTH AND INDUCTION OF SYSTEMIC RESISTANCE AGAINST PYRICULARIA ORYZAE IN LOWLAND RICEP.
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The understanding of the desorption mechanism in surface-assisted laser desorption/ionization (SALDI) remains incomplete because there are numerous types o
Article Electron-phonon coupling and heat dissipation in metal nanoparticles. This review discusses electron-phonon (e-ph) coupling and heat dissipation in noble metal nanoparticles, specifically, how the time constants for these events depend on siz...
Abstract. Catalysts are crucial for the production of fuels, chemicals and materials and for energy storage and conversion. They often consist of transition metal nanoparticles (,10 nm) as an active phase, supported on a porous material that provides stability to the system, but has 3D open porosity to allow diffusion of reactants and products. The effectiveness of a catalyst is a combination of three qualities: activity, selectivity and stability. All three are not only determined by the composition of the metal nanoparticle, but also greatly depend on factors such as the exact particle size (and particle size distribution), a redistribution of atoms within the nanoparticle under reaction conditions, the interaction between the metal nanoparticle and the support, and small amounts of additives (promoters) which can modify for instance the electronic properties or provide specific sites.. We study the performance of supported metal nanoparticles using 3D model supports (ordered mesoporous ...
A composite with well-dispersed metal nanoparticles at a ceramic surface was produced by partial reduction of solid solution. It was found that a small amount of dopant, such as Al2O3, Cr2O3, or Sc2O3, accelerated the precipitation of the metal nanoparticles during the reduction. Catalytic performance of the composite for methanol reforming was evaluated. In the Ni-based catalysts, the dopant decreased the CO production by promoting a methanation reaction, while in the Co-based catalysts, the dopant did it by inducing a water-gas shift reaction. Co/MgO with Sc2O3 doping showed the most preferable reforming performance, high H2 production, and CO2 selectivity. ...
Descrizione libro Royal Society Of Chemistry, United Kingdom, 2014. Hardback. Condizione libro: New. Language: English . Brand New Book. Catalysis is a central topic in chemical transformation and energy conversion. Thanks to the spectacular achievements of colloidal chemistry and the synthesis of nanomaterials over the last two decades, there have also been significant advances in nanoparticle catalysis. Catalysis on different metal nanostructures with well-defined structures and composition has been extensively studied. Metal nanocrystals synthesized with colloidal chemistry exhibit different catalytic performances in contrast to metal nanoparticles prepared with impregnation or deposition precipitation. Additionally, theoretical approaches in predicting catalysis performance and understanding catalytic mechanism on these metal nanocatalysts have made significant progress. Metal Nanoparticles for Catalysis is a comprehensive text on catalysis on Nanoparticles, looking at both their synthesis ...
The research in this dissertation examines the chemistry and applications of dendrimers in homogeneous catalysis. We examined interactions between dendrimers and charged probe molecules, prepared dendrimer-encapsulated metal nanoparticles in organic solvents, studied size-selectivity of dendrimer-encapsulted catalysts, and designed molecular rulers as in-situ probes to measure the location of dendrimer-encapsulted metal nanoparticles. The intrinsic proton binding constant and a constant that characterizes the strength of electrostatic interactions among occupied binding sites in poly(amidoamine) (PAMAM) dendrimers have been obtained by studying the effect of solution pH on the protonation of the dendrimers. The significant finding is that these two factors are greatly modulated by the unique and hydrophobic microenvironment in the dendrimer interior. Hydrophilic poly(propylene imine) (PPI) dendrimers were modified with various hydrophobic alkyl chains through an amide linkage and were then used ...
The use of biological sources such as microbes and plants can help in synthesizing nanoparticles in a reliable and eco-friendly way. The synthesis of nanoparticles by these natural sources is characterized by processes that take place near to ambient temperature and pressures and also near neutral pH. This edited volume authored by subject specialists, provides all the latest research and builds a database of bioreduction agents to various metal nanoparticles using different precursor systems. The book also highlights the different strategies such as simplicity, cost-effectiveness, environment-friendly and easily scalable, and includes parameters for controlling the size and shape of the materials developed from the various greener methods. In order to exploit the utmost potential metal nanoparticles synthesis from the different sources such as agricultural waste, flora and fauna, food waste, microbes and biopolymer systems, it is also crucial to recognize the biochemical and molecular mechanisms of
The local surface plasmon resonance (LSPR) of noble metal nanoparticles has recently been exploited in numerous applications. The LSPR peak position and linewidth have been studied quite extensively, but the magnitude of the resonance has not received much attention. Analytical solutions to Maxwells Equations cannot predict the scattering cross section of arbitrarily-shaped particles at arbitrary illumination and detection angles. Dark field microscpectroscopy is a powerful tool for studying plasmon resonances of noble metal nanoparticles and for developing their applications in sensing and imaging. We present a technique for calibrating dark field microspectrometer measurements to yield quantitative spectral scattering cross sections for arbitrarily shaped particles. Values for gold nanorods and gold bipyramids are reported. The measurements suggest that, for small elongated particles, the signal can be predicted by approximations based on the total cross section ...
Page contains details about example of metal nanoparticles on titanate carrier . It has composition images, properties, Characterization methods, synthesis, applications and reference articles : nano.nature.com
A combined theoretical and experimental approach has allowed researchers to predict and verify the full structure of a monolayer-coated molecular metal nanoparticle. The methodology was tested on silver-thiolate nanoparticles, expanding on earlier knowledge about gold nanoparticles, and is expected to be applicable to a broad range of sizes of nanoparticles made of different elements.. In a paper published Friday, November 25, 2016, in the journal Science Advances, researchers from the Georgia Institute of Technology and the University of Toledo report on an X-ray-determined structure that authenticates the a priori prediction, and in conjunction with first-principles theoretical analysis, supports the underlying forecasting methodology.. "Metal nanoparticles capped by organic ligands have fundamental and applied significance for understanding the physical and chemical principles controlling the assembly and atomic organization in nanocrystalline materials, and to their potential usage in fields ...
An international team of researchers led by RMIT has investigated alternatives to gold nanoparticles, which have been shown to concentrate radiation used to treat cancer but are highly expensive and mildly toxic.. Doctoral researcher Mamdooh Alqathami said the team had identified bismuth as an ideal option, with tests showing that enhancing radiotherapy by using nanoparticles containing the heavy metal almost doubled the dose of radiation to surrounding cancerous tissue.. "By enhancing radiation in the tumour, doctors may be able to decrease the initial dose of radiotherapy, which will hopefully result in fewer side effects for the patient while having the same impact on the cancer," Mr Alqathami, a researcher in the School of Medical Sciences, said.. "Metal nanoparticles have shown promise in improving the efficacy of radiotherapy but there is a need to find cheaper and safer alternatives for therapeutic use.. "Bismuth-based nanoparticles are an attractive option as they cost only a few dollars ...
TY - JOUR. T1 - Anisotropic metal nanoparticles. T2 - Synthesis, assembly, and optical applications. AU - Murphy, Catherine J.. AU - Sau, Tapan K.. AU - Gole, Anand M.. AU - Orendorff, Christopher J.. AU - Gao, Jinxin. AU - Gou, Linfeng. AU - Hunyadi, Simona E.. AU - Li, Tan. PY - 2005/7/28. Y1 - 2005/7/28. N2 - This feature article highlights work from the authors laboratories on the synthesis, assembly, reactivity, and optical applications of metallic nanoparticles of nonspherical shape, especially nanorods. The synthesis is a seed-mediated growth procedure, in which metal salts are reduced initially with a strong reducing agent, in water, to produce ∼4 nm seed particles. Subsequent reduction of more metal salt with a weak reducing agent, in the presence of structure-directing additives, leads to the controlled formation of nanorods of specified aspect ratio and can also yield other shapes of nanoparticles (stars, tetrapods, blocks, cubes, etc.). Variations in reaction conditions and ...
Conventional Förster resonance energy transfer (FRET) processes involving a pair of fluorophore and organic quencher are restricted to an upper distance limit of ~10 nm. The application of a metal nanoparticle as a quencher can overcome the distance barrier of the traditional FRET technique. However, no standard distance dependence of this resonance energy transfer (RET) process has been firmly established. We have investigated the nonradiative energy transfer process between an organic donor (fluorescein) and gold nanoparticle quencher connected by double stranded (ds) DNA. The quenching efficiency of the gold nanoparticle as a function of distance between the donor and acceptor was determined by time-resolved lifetime analyses of the donor. Our results showed a 1/d 4 distance dependence for the RET process for longer distances (,10 nm) and 1/d 6 distance dependence for shorter distances (,10 nm). Our results clearly indicate the applicability of metal nanoparticle based quenchers for studying ...
Optical Properties of Metal Nanoparticles. Sriharsha Karumuri. Introduction. Why nanoparticles are different from bulk materials? Nanoparticles are different from bulk materials and isolated molecules because of their unique optical, electronic and chemical properties. Slideshow 6716843 by joyceta-bravo
A one step process is described for forming metal nanoparticles in polymers at atmospheric pressure and room temperature or with mild heating and stirring. The inventive process includes addition of nanoparticle precursor salts, e.g. HAuCl 4 or AgNO 3 into a
Metal nanoparticles (also known as colloidal metal) have been around for a very long time, with the original scientific references dating over one hundred and fifty years ago*. Both pure metal and metal oxide colloids are used in a wide variety of applications including catalysts, ferrofluids, biological markers, and many others. Particle size and zeta potential of these suspensions are critical physical parameters that affect functionality and stability. The SZ-100 Nanoparticle Analyzer is an excellent analytical tool for determining particle size and zeta potential of metal colloids. ...
Due to high surface area, supported metal nanoparticles are thermodynamically prone to sintering. The experimental studies of this process exhibit sometimes transient bimodal particle size distributions. Such observations may result from the support heterogeneity. Looking retrospectively, one can also find the prediction that in the case of Ostwald ripening this feature can be related to charge of metal nano particles. In real systems, this charge is often associated with the metal support interaction and can be interpreted in the framework of the Schottky model. Using this model, the author shows that the charge redistribution cannot be behind bimodal particle size distributions. Moreover, the corresponding contribution to the driving force for Ostwald ripening is typically much smaller than the conventional one.
Most metal nanoparticles (NPs), except noble metal NPs, rapidly form a thin surface oxide in ambient conditions. The protective properties of these oxides improve or worsen depending on the environment, e.g., the human lung. Several properties, including the chemical/electrochemical stability and defect density, determine the capacity of these surface oxides to hinder the bulk metal from further oxidation (corrosion). The aim of this study was to investigate whether electrochemical surface oxide characterization of non-functionalized base metal NPs of different characteristics (Al, Mn and Cu) can assist in understanding their bioaccessibility (metal release) in cell media (DMEM+) and their cytotoxic properties following exposure in lung epithelial (A549) cells. The composition and valence states of surface oxides of metal NPs and their electrochemical activity were investigated using an electrochemical technique based on a graphite paste electrode to perform cyclic voltammetry in buffer ...
polarized guided waves that propagate confined to the surface of a two-dimensional array of silver (Ag) nanoparticles of average particle diameter and film thickness of approximately 400 and 154 nm, respectively, and comparable interparticle spacing. We interpret resonant features in the attenuated total reflection angular spectrum as arising from the excitation of guided waves in our discontinuous samples. The excitation of these waves is a direct consequence of the interaction of the light field with the localized resonance of the conduction electrons in the individual metal nanoparticles.. © 2000 Optical Society of America. Full Article , PDF Article ...
A facile and efficient γ-radiation strategy has been developed to incorporate surface-clean metal nanoparticles (NPs) into UiO-66-NH2 in the absence of stabilizing agents and additional reductants. This approach is enabled by metal ion reduction with active e−aq and H˙ species derived from water radiolysis. Inorganic Chemistry Frontiers HOT articles for 2017
Page contains details about example of stabilized metal nanoparticles . It has composition images, properties, Characterization methods, synthesis, applications and reference articles : nano.nature.com
Stabilised Bimetallic Metal Nanoparticles in Tailor-made Carbon Nanoreactors as Catalysts for Continuous-Flow Biomass Valorisation with Supercritical Fluids Dr. R. A. Bourne,a Dr. T. W. Chamberlain,a,b Dr. U. Hintermair,c & Dr. C. D. Smithd aSchool of Process, Environmental and Mechanical Engineering, University of Leeds, bSchool of Chemistry, University of Nottingham, cCentre for Sustainable Chemical Technologies, University of Bath, dSchool…
Western Blot and Immunoblotting Products. Read about how to use gold nanoparticles and other noble metal nanoparticles in immunoblotting in the following tech note: Immunoblotting Using Noble Metal Nanoparticles Probes
Western Blot and Immunoblotting Products. Read about how to use gold nanoparticles and other noble metal nanoparticles in immunoblotting in the following tech note: Immunoblotting Using Noble Metal Nanoparticles Probes
Introduction Functionalized gold nanoparticles (AuNPs) have prospective as antimicrobial products to counter, for example, fungi and bacteria [1]. Increasing efforts have actually been committed to research study in this field, especially in the advancement of metal nanoparticles (such as copper, silver and gold nanoparticles) as anti-bacterial agents [1-4] The most common target for antibacterial agents has been gram-negative germs, owing to the multi-drug resistance phenomena observed in gram-negative bacteria [2-5]. Advancements in this area have actually been influenced by the need to discover the type of metal nanoparticles, and the functionalization of such nanoparticles, that will display the best…. Further Info ...
Introduction Functionalized gold nanoparticles (AuNPs) have prospective as antimicrobial products to counter, for example, fungi and bacteria [1]. Increasing efforts have actually been committed to research study in this field, especially in the advancement of metal nanoparticles (such as copper, silver and gold nanoparticles) as anti-bacterial agents [1-4] The most common target for antibacterial agents has been gram-negative germs, owing to the multi-drug resistance phenomena observed in gram-negative bacteria [2-5]. Advancements in this area have actually been influenced by the need to discover the type of metal nanoparticles, and the functionalization of such nanoparticles, that will display the best…. Further Info ...
Noble metal nanoparticles interact strongly with visible light due to resonant excitation of conduction electron oscillations, an interaction referred to as a local surface plasmon resonance (LSPR) interaction. This LSPR interaction results in an enhancement of the electromagnetic field surrounding the nanoparticle, with a concomitant enhancement of optical signals. Recent interest in SER spectroscopy (SERS) has been rekindled by the observation of single molecule SERS. Nanofabrication provides a method for producing metal substrates for SERS with well-defined size and shape characteristics. Gold nanopillar structures are fabricated for this work by electron beam lithography. Rabbit skeletal-myosin-II HMM and actin can be produced in gram quantities and provide the basis for a highly reproducible in-vitro motility assay system. Using this well established assay linked with SERS we can look at how the heads of myosin interact with filaments of actin to produce steps in greater detail. This ...
Spanish researchers have shown that carbon nanotubes (CNTs) constitute the ideal templates for the formation of one-dimensional strings of metal nanoparticles, with potential uses as waveguides. Professor Luis Liz-Marz n, who heads the Nanoparticles and Nanostructures Group at the University of Vigo in Spain, explained to Nanowerk: "Linear arrays would have extremely interesting applications, for instance, in the construction of nanoelectronic circuits, but could also be used in photonics, since wave guiding via surface plasmons has been predicted for metal nanoparticle chains." Source: ...
Nanomaterials are being increasingly used for the development of electrochemical DNA biosensors, due to the unique electrocatalytic properties found in nanoscale materials. They offer excellent prospects for interfacing biological recognition events with electronic signal transduction and for designing a new generation of bioelectronic devices exhibiting novel functions. In particular, nanomaterials such as noble metal nanoparticles (Au, Pt), carbon nanotubes (CNTs), magnetic nanoparticles, quantum dots and metal oxide nanoparticles have been actively investigated for their applications in DNA biosensors, which have become a new interdisciplinary frontier between biological detection and material science. In this article, we address some of the main advances in this field over the past few years, discussing the issues and challenges with the aim of stimulating a broader interest in developing nanomaterial-based biosensors and improving their applications in disease diagnosis and food safety examination.
Oxide scales are supposed to protect alloys from extensive corrosion, but scientists at U.S. Department of Energys Argonne National Laboratory have discovered metal nanoparticle chinks in this armor.
The ability to study oxidation, reduction, and other chemical transformations of nanoparticles in real time and under realistic conditions is a nontrivial task due to their small dimensions and the often challenging environment in terms of temperature and pressure. For scrutinizing oxidation of metal nanoparticles, visible light optical spectroscopy based on the plasmonic properties of the metal has been established as a suitable method. However, directly relying on the plasmonic resonance of metal nanoparticles as a built-in probe to track oxidation has a number of drawbacks, including the loss of optical contrast in the late oxidation stages. To address these intrinsic limitations, we present a plasmonic heterodimer-based nanospectroscopy approach, which enables continuous self-referencing by using polarized light to eliminate parasitic signals and provides large optical contrast all the way to complete oxidation. Using Au-Cu heterodimers and combining experiments with finite-difference time-domain
The speed of nanoparticle assembly can be accelerated with the assistance of the molecule that carries life s genetic instructions, DNA, a team of researchers at the U.S. Department of Energy s Brookhaven National Laboratory recently found. Nanoparticles, particles with dimensions on the order of billionths of a meter, could potentially be used for more efficient energy generation and data storage, as well as improved methods for diagnosing and treating disease. Source: ...
TY - GEN. T1 - Controlling metal nanoparticle dispersion with nanocavity oxide supports. AU - Bo, Zhenyu. AU - George, Cassie. AU - Gallagher, James R.. AU - Miller, Jeffrey T.. AU - Stair, Peter C.. AU - Notestein, Justin M.. PY - 2014/1/1. Y1 - 2014/1/1. UR - http://www.scopus.com/inward/record.url?scp=84962073938&partnerID=8YFLogxK. UR - http://www.scopus.com/inward/citedby.url?scp=84962073938&partnerID=8YFLogxK. M3 - Conference contribution. AN - SCOPUS:84962073938. T3 - Nanoscale Science and Engineering Forum 2014 - Core Programming Area at the 2014 AIChE Annual Meeting. BT - Nanoscale Science and Engineering Forum 2014 - Core Programming Area at the 2014 AIChE Annual Meeting. PB - AIChE. ER - ...
The chemical industry depends on heterogeneous thermocatalytic processes to satisfy the ever-increasing demand for fuels and fertilizers. High temperatures and high pressures are generally required to accelerate chemical transformations and operate at practical rates. These harsh conditions, however, lead to huge energy consumption and other side effects, such as the lifetime of catalysts and parasitic formation of by-products. Light is used as an alternative energy input to drive chemical reactions on semiconducting photocatalysts, but the slow reaction rates and insufficient control of product selectivity hinder wide adaptation of photocatalysis. Plasmonic metal nanoparticles have been recently proposed as a new type of catalysts with photoactivities. Since metal nanoparticles have been widely used in thermocatalytic reactions, the strong light absorption capability of plasmonic catalysts could combine light and thermal energy to work cooperatively in enhancing rates of chemical reactions. In ...
An additive manufacturing system that produces parts by jetting metal ink has been developed by Israeli firm Xjet. The system is based on the companys so-called NanoParticle Jetting technology, which uses ink jetting to produce complex metal parts from a suspension of nanoscale particles.. The firm claims that the system represents a fundamental breakthrough in additive manufacturing and produced higher quality, more detailed parts than is possible with existing metal additive techniques - most of which build parts from powdered metal.. The technology uses solid metal nanoparticles suspended in liquid "ink" in sealed cartridges. During the printing process, ultra-fine layers of droplets of this ink - which also contains support structure nanoparticles - are deposited onto the build-tray, where extremely high temperatures cause the liquid jacket around the metal nanoparticles to evaporate. After this a sintering process is carried out to fuse the metal particles together.. ...
There is provided novel curable ink compositions comprising surfactant-coated magnetic metal nanoparticles. In particular, there is provided ultraviolet (UV) curable gel inks comprising at least a coated magnetic metal nanoparticles, one curable monomer, a radiation activated initiator that initiates polymerization of curable components of the ink, and optionally a gellant. The inks may also include optional colorants and one or more optional additives. These curable UV ink compositions can be used for ink jet printing in a variety of applications.
Conflicts and discrepancies around nanoparticle (NP) size effect on the optical properties of metal NPs of sizes below the mean free path of electron can be traced to the internal damping effect of the hybrid resonance of the inner band (IB) and the conduction band (CB) electrons of the noble metals. We present a scheme to show how alternative mathematical formulation of the physics of interaction between the CB and the IB electrons of NP sizes ,50 nm justifies this and resolves the conflicts. While a number of controversies exist between classical and quantum theories over the phenomenological factors to attribute to the NP size effect on the absorption bandwidth, this article shows that the bandwidth behavior can be well predicted from a different treatment of the IB damping effect, without invoking any of the controversial phenomenological factors. It finds that the IB damping effect is mainly frequency dependent and only partly size dependent and shows how its influence on the surface ...
When nanomaterials enter biological fluids, they are immediately covered by biomolecules, particularly proteins, forming the so-called protein corona. The dynamic nature and complexity of the protein corona can impact upon the biological effects and distribution of nanomaterials with an organism. Therefore, the protein corona is an important factor in determining the biological impact of any nanomaterials. The protein adsorption pattern is determined by various factors, including the bio-fluids protein composition, the nanomaterials physicochemical properties, as well as the time and type of exposure. Predominantly, research has focused upon spherical nano-objects, however, due to their ever-increasing potential use within human based applications, and, therefore, heightening and inevitable exposure to the human body, little is known regarding how proteins interact with nanofibers. Therefore, the present review focuses on the current knowledge as to how the geometry of man-made (nano)fibers, carbon
Plasmonic metal nanoparticles - including gold, silver, and platinum - are highly efficient at absorbing and scattering light. By adjusting the nanoparticle size, shape, and composition, the color can be tuned from the ultraviolet through the visible to the near-infrared regions of the electromagnetic spectrum. Gold Tagged shape-rods.
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Abstract: The computational study of the interaction between charged, ligand-protected metal nanoparticles and model lipid membranes has been recently addressed both at atomistic and coarse grained level. Here we compare the performance of three versions of the coarse grained Martini force field at describing the nanoparticle-membrane interaction. The three coarse-grained models differ in terms of treatment of long-range electrostatic interactions and water polarizability. The NP-membrane interaction consists in the transition from a metastable NP- membrane complex, in which the NP is only partially embedded in the membrane, to a configuration in which the NP is anchored to both membrane leaflets. All the three coarse grained models provide a description of the metastable NP-membrane complex that is consistent with that obtained using an atomistic force field. As for the anchoring transition, the polarizable- water Martini correctly describes the molecular mechanisms and the energetics of the ...
Self-assembly of nanoparticles is a promising route to form complex, nanostructured materials with functional properties. Nanoparticle assemblies characterized by a crystallographic alignment of the nanoparticles on the atomic scale, i.e. mesocrystals, are commonly found in nature with outstanding functional and mechanical properties. This thesis aims to investigate and understand the formation mechanisms of mesocrystals formed by self-assembling iron oxide nanocubes.. We have used the thermal decomposition method to synthesize monodisperse, oleate-capped iron oxide nanocubes with average edge lengths between 7 nm and 12 nm and studied the evaporation-induced self-assembly in dilute toluene-based nanocube dispersions. The influence of packing constraints on the alignment of the nanocubes in nanofluidic containers has been investigated with small and wide angle X-ray scattering (SAXS and WAXS, respectively). We found that the nanocubes preferentially orient one of their {100} faces with the ...
Early stages of antibacterial damage caused by metallic nanoparticles (NPs) were studied by Transmission Electron Microscopy (TEM) and combined Scanning Transmission Electron Microscopy with High Angle Annular Dark Field (STEM-HAADF), aiming to contribute to the elucidation of the primary antibacterial mechanism of metallic NPs.
Förster primarily concentrated on determining how illuminated plasmons reflect light and at what intensity. His technique employed two very particular thiol isomers, molecules whose structures are arranged as a cage of carbon atoms. Within the cage-like structure of the molecules are two boron atoms. By altering the positions of the boron atoms in the two isomers, the researchers were able to vary the dipole moments, in other words, the spatial charge separation over the cages. This led to an interesting discovery: If they applied the two types of cages to the surface of metal nanoparticles and excited plasmons using light, the plasmons reflected different amounts of light depending on which cage was currently on the surface. In short, the chemical nature of the molecules located on the surface of gold nanoparticles influenced the local resonance of the plasmons because the molecules also alter the electronic structure of the gold nanoparticles. ...