TY - JOUR. T1 - Morphology dependence of radial elasticity in multiwalled boron nitride nanotubes. AU - Chiu, H. C.. AU - Kim, S.. AU - Klinke, C.. AU - Riedo, E.. PY - 2012/9/3. Y1 - 2012/9/3. N2 - We report on the measurement of the radial modulus of boron nitride nanotubes (BN-NTs) with various sizes and thicknesses. These BN-NTs are radially much stiffer than previously reported thinner and smaller BN-NTs. Here, we show the key role of the morphology of the nanotubes in determining their radial rigidity; in particular, we find that the external and internal radii, R ext and R int, have a stronger influence on the radial modulus than the nanotubes thickness. The radial modulus decreases nonlinearly with 1/R ext until reaching, for a large number of layers and a large radius, the transverse elastic modulus of bulk h-BN.. AB - We report on the measurement of the radial modulus of boron nitride nanotubes (BN-NTs) with various sizes and thicknesses. These BN-NTs are radially much stiffer than ...
RGD-tagged helical rosette nanotubes aggravate acute lipopolysaccharide-induced lung inflammation Sarabjeet Singh Suri1, Steven Mills1, Gurpreet Kaur Aulakh1, Felaniaina Rakotondradani2, Hicham Fenniri2, Baljit Singh11Department of Veterinary Biomedical Sciences, University of Saskatchewan, Saskatoon; 2National Institute for Nanotechnology and Department of Chemistry, Edmonton, CanadaAbstract: Rosette nanotubes (RNT) are a novel class of self-assembled biocompatible nanotubes that offer a built-in strategy for engineering structure and function through covalent tagging of synthetic self-assembling modules (GRGDSK-G∧C motif). In this report, the GC motif was tagged with peptide Arg-Gly-Asp-Ser-Lys (RGDSK-G∧C) and amino acid Lys (K-G∧C) which, upon co-assembly, generate RNTs featuring RGDSK and K on their surface in predefined molar ratios. These hybrid RNTs, referred to as Kx/RGDSKy-RNT, where x and y refer to the molar ratios of K-G∧C and RGDSK-G∧C, were designed to target neutrophil integrins
A plasma treatment has been used to modify the surface of BNNTs. In one example, the surface of the BNNT has been modified using ammonia plasma to include amine functional groups. Amine functionalization allows BNNTs to be soluble in chloroform, which had not been possible previously. Further functionalization of amine-functionalized BNNTs with thiol-terminated organic molecules has also been demonstrated. Gold nanoparticles have been self-assembled at the surface of both amine- and thiol-functionalized boron nitride Nanotubes (BNNTs) in solution. This approach constitutes a basis for the preparation of highly functionalized BNNTs and for their utilization as nanoscale templates for assembly and integration with other nanoscale materials.
In the present work, Boron nitride nanotubes (BNNTs) were synthesized and submitted to a functionalization process (coating) with glucosamine. The nanostructures were physicochemical and morphologically characterized by Scanning Electron Microscopy (SEM), X-ray diffraction (XRD), Raman Spectroscopy and Photon Correlation Spectroscopy (PCS). Furthermore, in vitro tests were conducted to evaluate the cytocompatibility of the nanostructures. The results revealed that nanotubes presented size, polydispersity index and Zeta potential adequate to applied in vivo studies. The cytocompatibility test were conducted in normal MRC-5 fibroblast lung cells, through MTT and DAPI assays. The results revealed, in tested concentrations (0.1; 10; 50; 100; 200 µ/mL), that BNNTs no presented a cytotoxic profile and negligible DNA changes. Considering the results obtained, the BNNTs showed adequate characteristic to be applied as novel carrier system for radioisotope and drug delivery.
In the present work, based on extensive fully atomistic molecular dynamics simulations, we discuss the dynamics of neon atoms oscillating inside (5,5) single-walled carbon nanotubes (CNTs) and boron nitride nanotubes (BNNTs). Our results show that sustained high-frequency oscillatory regimes are possible for a large range of temperatures. Our results also show that the general features of the oscillations are quite similar to those observed in CNT and BNNT, in contrast with some speculations in previous works in the literature about the importance of broken symmetry and chirality exhibited by BNNTs ...
We investigate the ultrafast structural dynamics of multi-walled boron nitride nanotubes (BNNTs) upon femtosecond optical excitation using ultrafast electron diffraction in a transmission electron microscope. Analysis of the time-resolved (100) and (002) diffraction profiles reveals highly anisotropic lattic
M. Yamaguchi,A. Pakdel,C. Y. Zhi,et al. Utilization Of Multiwalled Boron Nitride Nanotubes For The Reinforcement Of Lightweight Aluminum Ribbons[J]. Nanoscale Research Letters,2013,8 ...
Our unique plasma synthesis process produces high quality BNNT material. This process does not use consumable electrodes or metallic catalysts, and is therefore completely free from metallic contaminants.. Our BNNT purified is produced using a proprietary process which removes free Boron. It also offers a high concentration of boron nitride nanotubes with small diameter, high crystallinity and high purity.. ...
Boron nitride aerogel is an aerogel made of highly porous boron nitride (BN). It typically consists of a mixture of deformed boron nitride nanotubes and nanosheets. It can have a density as low as 0.6 mg/cm3 and a specific surface area as high as 1050 m2/g, and therefore has potential applications as an absorbent, catalyst support and gas storage medium. BN aerogels are highly hydrophobic and can absorb up to 160 times their mass in oil. They are resistant to oxidation in air at temperatures up to 1200 °C, and hence can be reused after the absorbed oil is burned out by flame. BN aerogels can be prepared by template-assisted chemical vapor deposition at a temperature ~900 °C using borazine as the feed gas. Alternatively it can be produced by ball milling h-BN powder, ultrasonically dispersing it in water, and freeze-drying the dispersion. Song, Yangxi; Li, Bin; Yang, Siwei; Ding, Guqiao; Zhang, Changrui; Xie, Xiaoming (2015). "Ultralight boron nitride aerogels via template-assisted chemical ...
This new market research report forecasts on Wurtzite Boron Nitride Market providing complete market figures, consisting market size and estimation by Wurtzite Boron Nitride Market application and products depending upon geographical location for the forecasting period 2017 to 2025. Further, the Wurtzite Boron Nitride Market research report study also encompasses complete industry background, with Wurtzite Boron Nitride Market drivers, competitive market dynamics, market restraints, market growth opportunities, industry challenges and critical success factors (CSFs). The Wurtzite Boron Nitride Market research report examines top industry competitors, offering organization market share analysis and detailed outlines of these firms, with product benchmarking.. Browse Full Report Visit - http://bit.ly/2eO1ezQ. Reasons to Buy This Report :. ...
Self-organized anodic titania (TiO2) nanotube arrays are an interesting model anode material for use in Li-ion batteries owing to their excellent rate capability, their cycling stability and their enhanced safety compared to graphite. A composite material where carbothermally treated conductive TiO2 nanotubes are used as support for a thin silicon film has been shown to have the additional advantage of high lithium storage capacity. This article presents a detailed comparison of the structure, surface and bulk morphology of self-organized conductive TiO2 nanotube arrays, with and without silicon coating, using a combination of X-ray diffraction, X-ray reflectivity, grazing-incidence small-angle X-ray scattering (GISAXS) and time-of-flight grazing-incidence small-angle neutron scattering (TOF-GISANS) techniques. X-ray diffraction shows that the nanotubes crystallize in the anatase structure with a preferred (004) orientation. GISAXS and TOF-GISANS are used to study the morphology of the nanotube ...
Graphene-Boron Nitride nanohybrid materials are a class of compounds created from graphene and boron nitride nanosheets. Graphene and boron nitride both contain intrinsic thermally conductive and electrically insulative properties. The combination of these two compounds may be useful to advance the development and understanding of electronics. Several efforts have been made to create hybrid nanomaterials to explore their novel properties compared to their individual constituents. Studies have shown that nanohybrid materials distinctively utilize the best aspects of the individual constituents along with their novel functionalities though structural integrity and interfacial chemical bonding of the constituents. Graphene boron nitride nanohybrid materials are created through synthetic methods such as electron beam welding and chemical vapor deposition. Various different heterostructures of graphene and boron nitride can be assembled. Due to their isostructural, nearly lattice matched and ...
Listed below are low site density, vertically aligned carbon nanotube arrays grown on Chromium coated Silicon substrate, which are offered as overstock items. These one-of-a-kind arrays and forests were produced for other customers or for our internal R&D efforts. SEM images are available. If they fit your needs, these aligned nanotube arrays can be shipped to you the same day ...
The purpose of this study was to develop novel nanoscale biosensors using titania nanotubes (TNTs) made by anodization. Titania nanotubes were produced on pure titanium sheets by anodization at room temperature. In this research, the electrolyte composition ethylene glycol 250 mL/NH4F 1.5 g/DI water 20 mL was found to produce the best titania nanotubes array films for application in amperometric biosensors. The amperometric results exhibit an excellent linearity for uric acid (UA) concentrations in the range between 2 and 14 mg/dL, with 23.3 (µA·cm−2)·(mg/dL)−1 UA sensitivity, and a correlation coefficient of 0.993. The glucose biosensor presented a good linear relationship in the lower glucose concentration range between 50 and 125 mg/dL, and the corresponding sensitivity was approximately 249.6 (µA·cm−2)·(100 mg/dL)−1 glucose, with a correlation coefficient of 0.973.
In this work, a chiral hybrid superstructure has been achieved through a hierarchical, cooperative self-assembly/self-organization process in a multiple-component system comprising of gold nanorods, surfactants, and phospholipids film. This chiral hybrid superstructure presented a signate signal in plasmonic circular dichroism with negative collective plasmonic modes on one side of the plasmon resonance and positive modes on the other side. The origin of such an unusual optical activity is fundamentally different from that of chiral metal nanoparticles/nanoclusters in previous studies. We highlight here a possibility that helical alignment of gold nanorods in the hybrid superstructure would resemble mesogenic molecules in a cholesteric liquid crystalline mesophase, and the Coulomb dipole-dipole interactions between gold nanorods in such a chiral liquid crystalline-like mesophase would give rise to the plasmonic circular dichroism effect. This study also demonstrated a facile approach for ...
Nitrogen-doped titania nanotubes exhibiting catalytic activity on exposure to any one or more of ultraviolet, visible, and/or infrared radiation, or combinations thereof are disclosed. The nanotube arrays may be co-doped with one or more nonmetals and may further include co-catalyst nanoparticles. Also, methods are disclosed for use of nitrogen-doped titania nanotubes in catalytic conversion of carbon dioxide alone or in admixture with hydrogen-containing gases such as water vapor and/or other reactants as may be present or desirable into products such as hydrocarbons and hydrocarbon-containing products, hydrogen and hydrogen-containing products, carbon monoxide and other carbon-containing products, or combinations thereof.
Gold nanorods (GNRs) have been widely used for bio-imaging. However, GNRs assisted optical in vivo deep tissue imaging is severely restricted due to signal attenuation, low contrast, complex process or low real-timing. To overcome these problems, we functionalized GNRs with both near-infrared (NIR) fluorescence and surface enhanced Raman scattering (SERS) and utilized these co-functionalized GNRs for purely optical in vivo imaging of live mice. Our proposed technology has the combined advantages of high real-timing, high imaging contrast and deep detection ability. The distribution and excretion of intravenously injected GNRs in deep tissues of live mice were observed in vivo for the first time through purely optical imaging. We also demonstrated successfully in vivo biomedical applications of the co-functionalized GNRs to sentinel lymph node (SLN) mapping and tumor targeting of mice. The present technology has great future potentials for disease diagnosis and clinical therapies.. ...
|p|Ab-initio calculations using density functional theory (DFT) are used to investigate the non-covalent interactions between single wall armchair boron nitride nanotubes (BNNTs) with open ends and several heterocyclic molecules: thiophene (T; C|sub|4|/sub|H|sub|4|/sub|S), benzothiophene (BT; C8H6S) and dibenzothiophene (DBT; C|sub|12|/sub|H|sub|8|/sub|S). In the armchair model the nanotubes exhibit (n, n) chirality; here we consider n = 5. The exchange-correlation energies are treated according to the Hamprecht-Cohen-Tozer-Handy functional in the generalized gradient approximation (HCTH-GGA). A base function with double polarization is used. The geometry optimization of (5,5) BNNT-X; X = T, BT and DBT has been carried out using the minimum energy criterion in 5 different configurations of the molecules adsorbed on the nanotube. Our computer simulations have found that the preferential adsorption site of the molecule on the nanotube surface is the parallel configuration for BT and DBT, and at one
The invention provides a halloysite Ag-carrying antibacterial agent and a preparation method thereof. The preparation method comprises the following steps: (1) activating halloysite: adding the halloysite with the purity of not less than 80wt% to 1-5wt% of nitric acid solution, and stirring for activating at normal temperature, wherein, the solid-to-liquid ratio of a reaction system is 5-10% (mass percent); (2) drying: centrifugally dewatering and drying the activated halloysite to obtain the activated and dried halloysite; (3) loading: preparing 0.5-3wt% of silver nitrate solution, adjusting the pH value of the silver nitrate solution with dilute nitric acid to 5-6, adding the activated and dried halloysite, and stirring at the temperature of 40-60 DEG C for 0.5-2h, wherein, the solid-to-liquid ratio of a reaction system is 5-20% (mass percent); and (4) after reaction is ended, carrying out centrifugal filtration on the product, washing and drying the obtained filter cake to obtain the halloysite
Abstract: Neural prostheses have become ever more acceptable treatments for many different types of neurological damage and disease. Here we investigate the use of two different morphologies of titania nanotube arrays as interfaces to advance the longevity and effectiveness of these prostheses. The nanotube arrays were characterized for their nanotopography, crystallinity, conductivity, wettability, surface mechanical properties and adsorption of key proteins: fibrinogen, albumin and laminin. The loosely packed nanotube arrays fabricated using a diethylene glycol based electrolyte, contained a higher presence of the anatase crystal phase and were subsequently more conductive. These arrays yielded surfaces with higher wettability and lower modulus than the densely packed nanotube arrays fabricated using water based electrolyte. Further the adhesion, proliferation and differentiation of the C17.2 neural stem cell line was investigated on the nanotube arrays. The proliferation ratio of the cells as ...
Abstract: Neural prostheses have become ever more acceptable treatments for many different types of neurological damage and disease. Here we investigate the use of two different morphologies of titania nanotube arrays as interfaces to advance the longevity and effectiveness of these prostheses. The nanotube arrays were characterized for their nanotopography, crystallinity, conductivity, wettability, surface mechanical properties and adsorption of key proteins: fibrinogen, albumin and laminin. The loosely packed nanotube arrays fabricated using a diethylene glycol based electrolyte, contained a higher presence of the anatase crystal phase and were subsequently more conductive. These arrays yielded surfaces with higher wettability and lower modulus than the densely packed nanotube arrays fabricated using water based electrolyte. Further the adhesion, proliferation and differentiation of the C17.2 neural stem cell line was investigated on the nanotube arrays. The proliferation ratio of the cells as ...
Recent observations have revealed that intercellular connections can be formed through membrane nanotubes. These delicate structures could facilitate transport of organelles and membrane proteins between cells. The sharing of cell surface and cytoplasmic components between cells could be commonplace in biology, but an important physiological role for membrane nanotubes between immune cells is difficult to test with current technology.. ...
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Researchers at McGill University have developed a new, low-cost method to build DNA nanotubes block by block -- a breakthrough that could help pave the way for scaffolds made from DNA strands to be used in applications such as optical and electronic devices or smart drug-delivery systems.
From the Science Documentaries website: Productive Nanosystems, Superhydrophobic Carbon Nanotube Array, Nanotechnology at Berkeley, Nanotopia ...
Membrane nanotubes play important functional roles in numerous cell activities such as cellular transport and communication. By exerting an external pulling force over a finite region in a membrane patch, here we investigate the size dependence of the membrane nanotube formation under the continuum and atomistic mo
Page contains details about carbon nanotube array/Fe/Al2O3 . It has composition images, properties, Characterization methods, synthesis, applications and reference articles : nano.nature.com
Page contains details about Ti microwire covered with highly ordered Nb2O5-coated TiO2 nanotube arrays . It has composition images, properties, Characterization methods, synthesis, applications and reference articles : nano.nature.com
Gold nanorods (GNRs) combined with two-photon microscopy were explored for potential application in imaging of oral carcinogenesis. GNRs have been shown to be effective contrast agents for two photon luminescence in that excitation laser powers required for imaging are low compared to traditional fluorophores. Imaging of cells, ex vivo tissues, and in vivo oral mucosa labeled with GNRs was performed to evaluate potential advantages of these agents in molecular imaging of epithelial carcinogenesis. Powers required to elicit a two-photon luminescence signal from GNRs were determined for cells as well as normal and malignant transformed lesions, 24 hours following injection of GNRs in a hamster model for oral cancer. The strength of the detected emission as the function of the average incident laser power was measured in tissues with and without GNRs to compare the sensitivity of GNRs against tissue autofluorescence. Finally, in vivo imaging was performed immediately following GNR injection to ...
A facile strategy to fabricate gold [email protected] acid/calcium phosphate ([email protected]/CaP) yolk-shell nanoparticles (NPs) composed with a PAA/CaP shell and an AuNR yolk is reported. The as-obtained [email protected]/CaP yolk-shell NPs possess ultrahigh doxorubicin (DOX) loading capability (1 mg DOX/mg NPs), superior photothermal conversion property (26%) and pH/near-infrared (NIR) dual-responsive drug delivery performance. The released DOX continuously increased due to the damage of the CaP shell at low pH values. When the DOX-loaded [email protected]/CaP yolk-shell NPs were exposed to NIR irradiation, a burst-like drug release occurs owing to the heat produced by the AuNRs. Furthermore, [email protected]/CaP yolk-shell NPs are successfully employed for synergic dual-mode X-ray computed tomography (CT)/photoacoustic (PA) imaging and chemo-photothermal cancer therapy. Therefore, this work brings new insights for the synthesis of multifunctional nanomaterials and extends theranostic applications.. ...
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In the Johns Hopkins study, these building blocks attached themselves to separate molecular anchor posts, representing where the connecting bridge would begin and end. The segments formed two nanotube chains, each one extending away from its anchor post. Then, like spaghetti in a pot of boiling water, the lengthening nanotube chains wriggled about, exploring their surroundings in a random fashion. Eventually, this movement allowed the ends of the two separate nanotube strands to make contact with one another and snap together to form a single connecting bridge span.. To learn more about how this process occurs, the researchers used microscopes to watch the nanotubes link to their molecular landmarks, which were labeled with different colored fluorescent dyes and attached to transparent glass. The teams video equipment also captured the formation of nanotubes spans, as the two bridge segments lengthened and ultimately connected. Completion of each nanoscale bridge in the accompanying example ...
In another paper, published in the Journal of Physical Chemistry C, a team of investigators led by Paras Prasad, Ph.D., principal investigator of the National Cancer Institutes Cancer Nanotechnology Platform Partnership at the State University of New York at Buffalo, has shown that gold nanorods linked to a protein known as transferrin also target cancer cells and enable them to be detected using optimal imaging. In this case, the nanorods were taken into tumor cells bearing the transferrin receptor, where they accumulate in sufficient numbers to shine brightly when irradiated by light. Healthy cells, which have but a few transferrin receptors on their surfaces, did not accumulate the targeted nanorods ...
Many proteins in the cell sense and induce membrane curvature. We describe a method to pull membrane nanotubes from lipid vesicles to...
Gold nanorods can be optically trapped in aqueous solution and forced to rotate at kilohertz rates by circularly polarized laser light. This enables detailed investigations of local environmental parameters and processes, such as medium viscosity and nanoparticle-molecule reactions. Future applications may include nanoactuation and single-cell analysis. However, the influence of photothermal heating on the nanoparticle dynamics needs to be better understood in order to realize widespread and quantitative use. Here we analyze the hot Brownian motion of a rotating gold nanorod trapped in two dimensions by an optical tweezers using experiments and stochastic simulations. We show that, for typical settings, the effective rotational and translational Brownian temperatures are drastically different, being closer to the nanorod surface temperature and ambient temperature, respectively. Further, we show that translational dynamics can have a non-negligible influence on the rotational fluctuations due to ...
New drug-delivery systems have remained a challenge for pharmaceutical scientists due to the use of expensive polymers and the low loading capacity of prepared nanoparticles. There is pressure to develop formulations that contain not only cheaper materials but also have controlled-release properties. Halloysite nanotubes (HNTs) are a naturally occurring clay mineral similar to kaolin, possessing a special particle shape in the form of an ultramicroscopic multilayered hollow cylinder. Its uses encompass a wide range in anticancer therapy, sustained- and controlled-release drug-delivery systems, cosmetics, delivery of proteins, vaccines and genes. These advantages are due to its biocompatibility, significant mechanical strength and natural availability. The surfaces of the tubules can be modified by coating different polymers for application in the drug-delivery system. This review is focused on the various aspects of HNTs such as structure, properties, loading methods, applications and ...
We investigated the application of titania nanotubes arrays in the form of powders and membranes for water filtration and separation, and for employment in high-performance
Read "Light-driven self-assembly of hetero-shaped gold nanorods, Applied Physics A: Materials Science Processing" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.
A nonenzymatic glucose sensor was fabricated by electrodepositing cobalt rich cobalt-copper alloy nanoparticles (Co-CuNPs) on vertically aligned TiO2 nanotube (TDNT) arrays. For this, TDNT arrays with tube diameter of 60 nm were synthesized by electrochemical anodization. The composition of the electrodeposited alloy was optimized based on the electrocatalytic activity towards glucose oxidation. This is achieved by controlling the concentration of electrolyte and time of deposition. Chemical composition of the optimized Co-Cu alloy nanoparticles is determined to be Cu0.15Co2.84O4 with fcc crystalline structure. The sensor showed two linear range of detection with high sensitivity of 4651.0 μA mM-1 cm-2 up to 5 mM and 2581.70 μA mM-1 cm-2 from 5 mM to 12 mM with a lower detection limit of 0.6 μM (S/N = 3). The sensor is highly selective to glucose in the presence of various exogeneous and endogeneous interfering species and other sugars. The response of the sensor towards blood serum was in ...
Use DiagNano™ Protein A conjugated Gold Nanorods, diameter 10 nm, absorption max 780 nm for fast, easy, and consistent DNA/RNA Purification, Antibody/Protein Purification, Cell Isolation.
Use DiagNano™ Organic Gold Nanorods, diameter 10 nm, absorption max 808 nm for fast, easy, and consistent DNA/RNA Purification, Antibody/Protein Purification, Cell Isolation.
In this study, magnesium composites with nano-size boron nitride (BN) particulates of varying contents were synthesized using the powder metallurgy (PM) technique incorporating microwave-assisted two-directional sintering followed by hot extrusion. The effect of nano-BN addition on the microstructural and the mechanical behavior of the developed Mg/BN composites were studied in comparison with pure Mg using the structure-property correlation. Microstructural characterization revealed uniform distribution of nano-BN particulates and marginal grain refinement. The coefficient of thermal expansion (CTE) value of the magnesium matrix was improved with the addition of nano-sized BN particulates. The results of XRD studies indicate basal texture weakening with an increase in nano-BN addition. The composites showed improved mechanical properties measured under micro-indentation, tension and compression loading. While the tensile yield strength improvement was marginal, a significant increase in compressive
Novel boron nitride agglomerated powders are provided having controlled density and fracture strength features. In addition methods for producing same are provided. One method calls for providing a fe
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Conducting polymer/ halloysite nanotubes (HNTs) composite were synthesized by a mechanochemical reaction in the solid state by milling system. 2, 5- d..
It is important to control the aspect ratio of individual gold nanorod as tiny change in aspect ratio and shape of gold nanorod can lead to different optical properties of gold nanorods. In this work, we report the ...
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Enhanced volume holographic refractive index grating by employing a strong volume holographic absorption grating induced by the periodic spatial distribution of gold nanoparticles due to the polymerization-driven multicomponent diffusion in a bulk gold nanoparticles doped photopolymer is noticeable. Till now most works are only focused on changing the concentration of nanoparticles and the radius of sphere nanoparticles. We propose an approach to improve the volume holographic grating by changing the size and shape of doped nanoparticles. The difference between nanorods and nanospheres is analyzed by the finite difference time domain(FDTD) method and the holographic kinetic model. The simulation results indicate that the nanorods has stronger localized surface plasmon resonance effect. The size and the aspect ratio of gold nanorods are optimized for the best absorption at a certain wavelength of recording light. The experiment results verify that the nanoparticles can be designed to achieve ...