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Journal articles on the topic 'Au nanoshells'

Author: Grafiati

Published: 4 June 2021

Last updated: 15 February 2022

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1

Liu, C. H., A. Yella, B. Q. Li, and K. Bandyopadhyay. "Measurement of Light Attenuation in Phantom Tissue Embedded with Gold Nanoshells." Advanced Materials Research 647 (January 2013): 232–38. http://dx.doi.org/10.4028/www.scientific.net/amr.647.232.

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Light attenuation in phantom tissue embedded with gold nanoshells is measured using a photospectrometer with an integrated sphere system. Gold nanoshells are synthesized and a paste is made by mixing them with agar (or phantom tissue); from which slab samples of different nanoshell concentrations and thicknesses are prepared. Light attenuation is measured as a function of light exciting frequencies, nanoshell concentrations and tissue thickness. The nanoshell particle concentrations are determined by matching the Mie solution for a single nanoshell with the measured attenuation coefficient at the local surface plasma resonance frequency. For the range of the concentrations studied, light attenuation is linearly dependent on the nanoshell concentration, and thus the rule of independent scattering/absorption is observed. The frequency of exciting light strongly affects light attenuation in a nanoshell-populated medium, with the largest attenuation occurring at the local surface plasma resonance frequency of the nanoshells, which is consistent with theoretical predictions. For the measured samples of phantom tissue populated with nanoshells, the optical thickness is about ~8 mm.

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2

Liu, C. H., and B. Q. Li. "Energy Absorption in Gold Nanoshells." Journal of Nano Research 23 (July 2013): 74–82. http://dx.doi.org/10.4028/www.scientific.net/jnanor.23.74.

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A modeling study on energy absorption and transport in an isolated nanoshell and aggregates of nanoshells under localized surface plasma resonance (SPR) conditions is presented. A comprehensive model for multi-scattering of electromagnetic waves by a cluster of multilayered nanoshells is developed, which applies the Wigner-Eckart theorem for the calculation of the total scattering cross sessions of nanoshell aggregates. Absorption by an isolated nanoshell and by nanoshell clusters is studied using the model. Results show that the inter-nanoshell coupling results in strong field enhancement near the particle surface. Energy absorption in a nanoshell can be tuned by varying the structural parameters of the nanoshell. Smaller particles are more absorbing than the large ones, other conditions being equal. Because of the presence of a dielectric cavity, the radial distribution of the absorbed power in the metal shell may differ from the classical skin depth phenomena. The interaction among particles in close proximity causes the energy absorption efficiency and the resonance position of a nanoshell cluster to differ from those of an isolated nanoshell.

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3

Yang, Qinyou, Zailin Yang, Yong Yang, Guowei Zhang, and Yu Zhang. "Mechanical properties of single crystal copper ellipsoidal nanoshells by molecular dynamics." International Journal of Modern Physics B 32, no. 16 (2018): 1850196. http://dx.doi.org/10.1142/s0217979218501965.

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Single crystal copper ellipsoidal nanoshells under outer normal tensile loadings are investigated by the molecular dynamics method. Normal stress and Mises stress are introduced to describe the mechanical properties. The uniform thickness nanoshells, the variable thickness nanoshells and the variable radius nanoshells are simulated to elucidate the effect of thickness on yielding behaviors and other mechanical properties. Potential energies, stresses and dislocations of nanoshells are discussed in the paper. The dislocations of these nanoshells form an octagon or that with an external quadrangle. The variable thickness nanoshells break this shape slightly. The potential energies of nanoshells have stable stages and then increase. The outer normal stresses and Mises stresses of different models differ from eath other. The thickness of nanoshells affects the elastic stage and the variable thickness nanoshell has different mechanical properties with others. When the radiuses of nanoshells with the same thickness are different, their dislocation shapes are the pressed octagon. Thier normal yield stresses are different, but their Mises yield stress are same. Also, the outer shape determines the trend of curves. The structure of a sphere is steadier than that of an ellipsoid.

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4

LEE, JIN HYOUNG, and WOUNJHANG PARK. "THREE-DIMENSIONAL METALLIC PHOTONIC CRYSTAL BASED ON SELF-ASSEMBLED GOLD NANOSHELLS." Functional Materials Letters 01, no. 01 (2008): 65–69. http://dx.doi.org/10.1142/s1793604708000125.

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Three-dimensional metallic photonic crystal is fabricated by self-assembly of gold nanoshells. In order to fabricate highly ordered crystal structure, fabrication parameters such as silica coating thickness, the zeta potential and the concentration of gold nanoshells are carefully controlled and optimized. Highly ordered gold nanoshell opal is fabricated and its structural and optical properties are presented.

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5

Zhang, Peng Fei, and Pei Hong Cheng. "Investigation of Plasmon Resonances of Ag Nanoshells for Sensing Applications." Advanced Materials Research 463-464 (February 2012): 1459–62. http://dx.doi.org/10.4028/www.scientific.net/amr.463-464.1459.

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Sensing with metal nanostructures is one of the most promising applications of nanoplasmonic devices. This paper demonstrated the theoretical simulation studies on the localized surface plasmon (LSP) of Ag nanoshells with a core diameter of 20 nm and 50 nm. The refractive index-sensing properties, such as sensitive band locations of the Ag nanoshells and sensitive spectral features as a function of nanoshell thickness, are investigated. It is found that the thicker Ag nanoshells show higher sensitivity, but the higher-order LSP resonance modes and wide extinction spectra band degrade its response. The optimum thickness is concluded to be 10nm with a sensitivity of 370nm/RIU.

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6

Wang, Yan Qing, Yun Fei Liu, and T. H. Yang. "Nonlinear Thermo-Electro-Mechanical Vibration of Functionally Graded Piezoelectric Nanoshells on Winkler–Pasternak Foundations Via Nonlocal Donnell’s Nonlinear Shell Theory." International Journal of Structural Stability and Dynamics 19, no. 09 (2019): 1950100. http://dx.doi.org/10.1142/s0219455419501001.

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The thermo-electro-mechanical nonlinear vibration of circular cylindrical nanoshells on the Winkler–Pasternak foundation is investigated. The nanoshell is made of functionally graded piezoelectric material (FGPM), which is simulated by the nonlocal elasticity theory and Donnell’s nonlinear shell theory. The Hamilton’s principle is employed to derive the nonlinear governing equations and corresponding boundary conditions. Then, the Galerkin’s method is used to obtain the nonlinear Duffing equation, to which an approximate analytical solution is obtained by the multiple scales method. The results reveal that the system exhibits hardening-spring behavior. External applied voltage and temperature change have significant effect on the nonlinear vibration of the FGPM nanoshells. Moreover, the effect of power-law index on the nonlinear vibration of the FGPM nanoshells depends on parameters such as the external applied voltage, temperature change and properties of the Winkler–Pasternak foundation.

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7

Wu, Han, Haizeng Song, Zixia Lin, Shancheng Yan, and Yi Shi. "Preparation of SnO Nanoshells with Enhanced Lithium-Storage Properties." Journal of Nanoscience and Nanotechnology 20, no. 3 (2020): 1832–37. http://dx.doi.org/10.1166/jnn.2020.17131.

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Tin monoxide is a kind of IV–VI metal monoxides that has attracted great deal of attention due to its wide optical band gap and high field effect mobility in the past decade. On the other hand, nanoshell is a unique porous structure. Its curved shell provides a shelter for the hollow core, as well as a much bigger special surface area. We in this study systematically prepared SnO nanoshells through a facile self-assembly method under different annealing conditions. The lithium ion batteries were fabricated immediately based on the as prepared nanoshells. The capacity of as fabricated lithium ion batteries was 559.3 mAhg-1 at rate performance of 0.1 Ag-1 and 497.5 mAhg-1 at 1 Ag-1 in 30th cycle. This work exhibited high application performance of SnO nanoshells. We hope this work will help study similar structure and applications of IV–VI metal monoxides.

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8

Nika, Denis, Evghenii Pokatilov, Vladimir Fomin, Josef Devreese, and Jacques Tempere. "Resonant Terahertz Light Absorption by Virtue of Tunable Hybrid Interface Phonon–Plasmon Modes in Semiconductor Nanoshells." Applied Sciences 9, no. 7 (2019): 1442. http://dx.doi.org/10.3390/app9071442.

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Metallic nanoshells have proven to be particularly versatile, with applications in biomedical imaging and surface-enhanced Raman spectroscopy. Here, we theoretically demonstrate that hybrid phonon-plasmon modes in semiconductor nanoshells offer similar advantages in the terahertz regime. We show that, depending on tm,n,nhe doping of the semiconductor shells, terahertz light absorption in these nanostructures can be resonantly enhanced due to the strong coupling between interface plasmons and phonons. A threefold to fourfold increase in the absorption peak intensity was achieved at specific values of electron concentration. Doping, as well as adapting the nanoshell radius, allowed for fine-tuning of the absorption peak frequencies.

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9

Zhang, Xing Fang, and Feng Shou Liu. "Multipolar Surface Plasmon Peaks in Gold Nanoshells." Applied Mechanics and Materials 730 (January 2015): 137–40. http://dx.doi.org/10.4028/www.scientific.net/amm.730.137.

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The intensities of the dipole, quadrupole and octupole modes for gold nanoshells have been investigated with various dielectric constants for the embedding medium and with various sizes of the nanoshells by means of Mie theory. With the increase in the dielectric constant of embedding medium, it is found that the intensities of all modes become stronger first, and then the higher mode starts to become weak. We also observe with decreasing the core size of a nanoshell with a fixed outer radius, a larger dielectric constant for the embedding medium is needed corresponding to the change of higher mode intensities from stronger to weaker. We have ascribed the changes of the dipole, quadrupole and octupole modes to the competition among the variations of induced surface charges, conduction electrons and oscillation electrons.

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10

Uchida, Shuhei, Kazuya Yamamura, and Nobuyuki Zettsu. "Fabrication of Precise Asymmetric Nanoshells Array with Nanogaps for a Label-Free Immunoassay Based on NIR-Light Responsive LSPR." Key Engineering Materials 523-524 (November 2012): 680–85. http://dx.doi.org/10.4028/www.scientific.net/kem.523-524.680.

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Localized surface plasmon resonance (LSPR) based sensors are a well established technology utilized for label-free biochemical sensing in immunoassay, medical diagnostics and environmental monitoring. The understanding of asymmetric metal nanoparticles, new object for complex, coupled plasmon systems providing localized significantly enhanced E-field, is central to a wide range of novel applications and processes in science of higher sensitive sensing systems. However, few methods are available for actual characterization of such nanostructures at the single particle level. Here we propose a precise and large sized scale fabrication technique for asymmetric nanoshells array with nanogaps of several tens of nanometers for LSPR sensor through atmospheric pressure plasma etching processes. A nanoshell was simply constructed by laminating thin Au films on periodic isolated polymer nanoparticles template. This nanoshells array was expected to exhibit specific near-infrared plasmonic properties. When measuring the sensitivity, nanoshells array exhibited a high sensitivity to changes of surrounding refractive index and showed a higher sensor figure of merit than the alternative structures. This indicated that the enhanced plasmon E-field in the asymmetric nanostructures improved sensor performance. Our fabrication technique and the optical properties of the arrays will provide useful information for developing new plasmonic applications.

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11

ZHOU, XIN, HONGJIAN LI, SHAOLI FU, SUXIA XIE, HAIQING XU, and JINJUN WU. "OPTICAL PROPERTIES AND PLASMON RESONANCE OF COUPLED GOLD NANOSHELL ARRAYS." Modern Physics Letters B 25, no. 02 (2011): 109–18. http://dx.doi.org/10.1142/s0217984911025523.

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The optical properties and plasmon resonances coupling of ordered gold nanoshell arrays are investigated theoretically by means of finite-difference time-domain (FDTD) theory. We showed that the thickness, size and inter-shell distance of the nanoshells can tune the optical transmission of the system and the highly geometry-dependent plasmon response can be seen as an interaction between the essentially fixed-frequency plasmon response of a nanosphere and that of a nanocavity for the nanoshells. We also revealed the two different resonance modes by analyzing the spatial distributions of electric field component Ez. We proposed that the peaks of the lower energy mainly originate from the sphere plasmons coupling and the peaks of the higher energy are mainly attributed to the coupling between the sphere plasmons and the cavity plasmons.

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12

Hirsch, Leon R., Andre M. Gobin, Amanda R. Lowery, et al. "Metal Nanoshells." Annals of Biomedical Engineering 34, no. 1 (2006): 15–22. http://dx.doi.org/10.1007/s10439-005-9001-8.

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13

Mayle, Kristine M., Kathryn R. Dern, Vincent K. Wong, et al. "Engineering A11 Minibody-Conjugated, Polypeptide-Based Gold Nanoshells for Prostate Stem Cell Antigen (PSCA)–Targeted Photothermal Therapy." SLAS TECHNOLOGY: Translating Life Sciences Innovation 22, no. 1 (2016): 26–35. http://dx.doi.org/10.1177/2211068216669710.

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Currently, there is no curative treatment for advanced metastatic prostate cancer, and options, such as chemotherapy, are often nonspecific, harming healthy cells and resulting in severe side effects. Attaching targeting ligands to agents used in anticancer therapies has been shown to improve efficacy and reduce nonspecific toxicity. Furthermore, the use of triggered therapies can enable spatial and temporal control over the treatment. Here, we combined an engineered prostate cancer–specific targeting ligand, the A11 minibody, with a novel photothermal therapy agent, polypeptide-based gold nanoshells, which generate heat in response to near-infrared light. We show that the A11 minibody strongly binds to the prostate stem cell antigen that is overexpressed on the surface of metastatic prostate cancer cells. Compared to nonconjugated gold nanoshells, our A11 minibody-conjugated gold nanoshell exhibited significant laser-induced, localized killing of prostate cancer cells in vitro. In addition, we improved upon a comprehensive heat transfer mathematical model that was previously developed by our laboratory. By relaxing some of the assumptions of our earlier model, we were able to generate more accurate predictions for this particular study. Our experimental and theoretical results demonstrate the potential of our novel minibody-conjugated gold nanoshells for metastatic prostate cancer therapy.

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14

Sahmani, S., and M. M. Aghdam. "Imperfection sensitivity of the nonlinear axial buckling behavior of FGM nanoshells in thermal environments based on surface elasticity theory." International Journal of Computational Materials Science and Engineering 06, no. 01 (2017): 1750003. http://dx.doi.org/10.1142/s2047684117500038.

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A size-dependent shell model which accounts for geometrical imperfection sensitivity of the axial postbuckling characteristics of a cylindrical nanoshell made of functionally graded material (FGM) is proposed within the framework of the surface elasticity theory. In accordance with a power law, the material properties of the FGM nanoshell are supposed to vary through the shell thickness. In order to eliminate the stretching-bending coupling terms, the change in the position of physical neutral plane corresponding to different volume fractions is taken into account. Based upon the virtual work’s principle, the non-classical governing differential equations are derived and then deduced to boundary layer-type ones. After that, a perturbation-based solution methodology is employed to predict the size dependency in the nonlinear instability of perfect and imperfect axially loaded FGM nanoshells with various values of shell thickness, material property gradient index and different uniform temperature changes. It was seen that for thicker FGM nanoshells in which the surface free energy effects diminish, the influence of the initial geometric imperfection on the critical buckling load is higher than its influence on the minimum load of the postbuckling domain. It is also found that through reduction of the surface free energy effects, the influence of material property gradient index on the critical end-shortening of FGM nanoshell decreases.

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15

Orrill, Michael, Dustin Abele, Michael J. Wagner, and Saniya LeBlanc. "Sterically Stabilized Multilayer Graphene Nanoshells for Inkjet Printed Resistors." Electronic Materials 2, no. 3 (2021): 394–412. http://dx.doi.org/10.3390/electronicmat2030027.

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In the field of printed electronics, there is a pressing need for printable resistors, particularly ones where the resistance can be varied without changing the size of the resistor. This work presents ink synthesis and printing results for variable resistance, inkjet-printed patterns of a novel and sustainable carbon nanomaterial—multilayer graphene nanoshells. Dispersed multilayer graphene nanospheres are sterically stabilized by a surfactant (Triton X100), and no post-process is required to achieve the resistive functionality. A surface tension-based adsorption analysis technique is used to determine the optimal surfactant dosage, and a geometric model explains the conformation of adsorbed surfactant molecules. The energetic interparticle potentials between approaching particles are modeled to assess and compare the stability of sterically and electrostatically stabilized multilayer graphene nanoshells. The multilayer graphene nanoshell inks presented here show a promising new pathway toward sustainable and practical printed resistors that achieve variable resistances within a constant areal footprint without post-processing.

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16

Liu, Chao, Jingwei Lv, Famei Wang, et al. "Analysis of Localized Surface Plasmon Resonance in Ag/ITO/CdS/SiO2 Multilayered Nanostructured Composite." Nano 10, no. 08 (2015): 1550117. http://dx.doi.org/10.1142/s1793292015501179.

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Multilayered nanoshells have attracted much attention due to their unique optical, electronic and magnetic properties. In this work, numerical calculation using discrete dipole approximation (DDA) is conducted to investigate the quad-layered metal nanoshell consisting of a particle with a dielectric silica (SiO2) core, inner cadium sulfide (CdS) shell, middle indium tin oxide (ITO) shell and outer metal silver (Ag) shell. The phenomenon is interpreted by plasmon hybridization theory and the Ag–ITO–CdS–SiO2 multilayered nanoshells are studied by extinction spectra of localized surface plasmon resonance. The variation in the spectrum peak with nanoparticle thickness and refractive index of the surrounding medium is derived. The electric field enhancement contour around the nanoparticles under illumination is analyzed at the plasmon resonance wavelength. The [Formula: see text], [Formula: see text], and [Formula: see text] modes red-shift with the refractive index of the surrounding medium and increase in the layer thickness causes either blue-shift or red-shift as shown by the extinction spectra. The mechanism of the red-shift or blue-shift is discussed. The [Formula: see text] mode blue-shifts and furthermore, the [Formula: see text] and [Formula: see text] modes of the Ag coated multilayered nanostructure are noticeable by comparing the extinction efficiency spectra of the Au–ITO–CdS–SiO2 and Ag–ITO–CdS–SiO2 multilayered nanoshells.

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17

Cowley, J. M., and J. B. Hudis. "Atomic-focuser Imaging by Graphite Crystals in Carbon Nanoshells." Microscopy and Microanalysis 6, no. 5 (2000): 429–36. http://dx.doi.org/10.1007/s100050010049.

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AbstractOne of the atomic-focuser modes for ultra-high resolution electron microscopy is described theoretically and illustrated by the observation of images formed within the diffraction spots of nanodiffraction patterns of carbon nanoshells. In this mode, the specimen is illuminated by the focused probe of a scanning transmission electron microscope and is followed by a thin crystal at a Fourier-image distance. The theory shows that each diffraction spot of the crystal contains a magnified image of the illuminated area of the specimen, having a resolution depending on the width of the intensity peak of electrons channeled along atomic rows in the crystal. A thin graphite crystal, contained within one wall of a carbon nanoshell, can act as an atomic focuser to image part of the other wall of the nanoshell, or tungsten atoms deposited on this wall. Simulations of the transmission of electrons through graphite crystals show that the images formed should have a resolution of about 0.06 nm. Experimental images suggest that this resolution has been attained in the imaging of tungsten atoms or clusters of tungsten atoms.

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18

Pinna, Marco, Xiaohu Guo, and Andrei V. Zvelindovsky. "Block copolymer nanoshells." Polymer 49, no. 12 (2008): 2797–800. http://dx.doi.org/10.1016/j.polymer.2008.04.038.

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19

Tsukerman, Igor. "Superfocusing by nanoshells." Optics Letters 34, no. 7 (2009): 1057. http://dx.doi.org/10.1364/ol.34.001057.

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20

Sanchez-Gaytan, Brenda L., and So-Jung Park. "Spiky Gold Nanoshells." Langmuir 26, no. 24 (2010): 19170–74. http://dx.doi.org/10.1021/la1038969.

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21

Soto, Fernando, Gregory L. Wagner, Victor Garcia-Gradilla, et al. "Acoustically propelled nanoshells." Nanoscale 8, no. 41 (2016): 17788–93. http://dx.doi.org/10.1039/c6nr06603h.

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22

Halas, Naomi. "Playing with Plasmons: Tuning the Optical Resonant Properties of Metallic Nanoshells." MRS Bulletin 30, no. 5 (2005): 362–67. http://dx.doi.org/10.1557/mrs2005.99.

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AbstractNanoshells, concentric nanoparticles consisting of a dielectric core and a metallic shell, are simple spherical nanostructures with unique, geometrically tunable optical resonances. As with all metallic nanostructures, their optical properties are controlled by the collective electronic resonance, or plasmon resonance, of the constituent metal, typically silver or gold. In striking contrast to the resonant properties of solid metallic nanostructures, which exhibit only a weak tunability with size or aspect ratio, the optical resonance of a nanoshell is extraordinarily sensitive to the inner and outer dimensions of the metallic shell layer. The underlying reason for this lies beyond classical electromagnetic theory, where plasmon-resonant nanoparticles follow a mesoscale analogue of molecular orbital theory, hybridizing in precisely the same manner as the individual atomic wave functions in simple molecules. This plasmon hybridization picture provides an essential “design rule” for metallic nanostructures that can allow us to effectively predict their optical resonant properties. Such a systematic control of the far-field optical resonances of metallic nanostructures is accomplished simultaneously with control of the field at the surface of the nanostructure. The nanoshell geometry is ideal for tuning and optimizing the near-field response as a stand-alone surface-enhanced Raman spectroscopy (SERS) nanosensor substrate and as a surface-plasmon-resonant nanosensor.Tuning the plasmon resonance of nanoshells into the near-infrared region of the spectrum has enabled a variety of biomedical applications that exploit the strong optical contrast available with nanoshells in a spectral region where blood and tissue are optimally transparent.

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23

Guan, Bu Yuan, Le Yu, Ju Li, and Xiong Wen (David) Lou. "A universal cooperative assembly-directed method for coating of mesoporous TiO2 nanoshells with enhanced lithium storage properties." Science Advances 2, no. 3 (2016): e1501554. http://dx.doi.org/10.1126/sciadv.1501554.

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TiO2 is exceptionally useful, but it remains a great challenge to develop a universal method to coat TiO2 nanoshells on different functional materials. We report a one-pot, low-temperature, and facile method that can rapidly form mesoporous TiO2 shells on various inorganic, organic, and inorganic-organic composite materials, including silica-based, metal, metal oxide, organic polymer, carbon-based, and metal-organic framework nanomaterials via a cooperative assembly-directed strategy. In constructing hollow, core-shell, and yolk-shell geometries, both amorphous and crystalline TiO2 nanoshells are demonstrated with excellent control. When used as electrode materials for lithium ion batteries, these crystalline TiO2 nanoshells composed of very small nanocrystals exhibit remarkably long-term cycling stability over 1000 cycles. The electrochemical properties demonstrate that these TiO2 nanoshells are promising anode materials.

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24

WANG, CHIH-KUANG, SZU-HSIEN CHEN, WAN-YUN LI, CHERN-HSIUNG LAI, and WEN-CHENG CHEN. "BIOACTIVE GLASS SHELL GROWTH OF A Si–Na–Ca–P LAYER ON GOLD NANOPARTICLES FUNCTIONALIZED WITH MERCAPTOPROPYLTRIMETHYLOXYSILANE–SILICATE–TETRAETHYLOTHOSILICATE." Surface Review and Letters 16, no. 01 (2009): 37–42. http://dx.doi.org/10.1142/s0218625x09012263.

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Calcium phosphate and silicate-modified gold surfaces have potential applications in orthopedic and dental reconstruction, especially when combined with bone cement or dental resins. The aim of this study was to evaluate the formation of a Si – Na – Ca – P glass system nanoshell on functionalized gold nanoparticles. Stable gold nanoparticle suspensions were prepared by controlled reduction of HAuCl 4 using the sodium citrate method to obtain a nanogold-mercaptopropyltrimethyloxysilane (MPTS)–silicate–tetraethylothosilicate (TEOS)-capped particle solution. The nanoshells were formed when directly reacted with a 10-4 M calcium phosphate ion solution. The median nanoparticle diameter was observed to be 15 nm. The MPTS–silicate–TEOS–functionalized nanoshell more effectively formed a glass shell as compared with a nonsilicate nanoshell. The changes in the surface morphology and composition were observed by a scanning transmission electron microscope equipped with energy-dispersive X-ray spectroscopy. As seen using EDS, the nanoshell was in a glass phase with CaO -poor layers.

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Setoura, Kenji, Tetsuro Tsuji, Syoji Ito, Satoyuki Kawano, and Hiroshi Miyasaka. "Opto-thermophoretic separation and trapping of plasmonic nanoparticles." Nanoscale 11, no. 44 (2019): 21093–102. http://dx.doi.org/10.1039/c9nr05052c.

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We have succeeded in the selective trapping of single gold nanoshells with specific sizes and sweeping others out completely, only by irradiating the dense colloidal suspension of gold nanoshells with a focused near infrared continuous-wave laser.

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Cheng, Zhiliang, Gemma D. D'Ambruos, and Craig A. Aspinwall. "Stabilized Porous Phospholipid Nanoshells." Langmuir 22, no. 23 (2006): 9507–11. http://dx.doi.org/10.1021/la061542i.

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27

Troutman, Timothy S., Jennifer K. Barton, and Marek Romanowski. "Biodegradable Plasmon Resonant Nanoshells." Advanced Materials 20, no. 13 (2008): 2604–8. http://dx.doi.org/10.1002/adma.200703026.

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Cohn, Daniel, Hagit Sagiv, Alexandra Benyamin, and Gilad Lando. "Engineering thermoresponsive polymeric nanoshells." Biomaterials 30, no. 19 (2009): 3289–96. http://dx.doi.org/10.1016/j.biomaterials.2009.02.026.

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29

Bryan, William W., Andrew C. Jamison, Pawilai Chinwangso, Supparesk Rittikulsittichai, Tai-Chou Lee, and T. Randall Lee. "Preparation of THPC-generated silver, platinum, and palladium nanoparticles and their use in the synthesis of Ag, Pt, Pd, and Pt/Ag nanoshells." RSC Advances 6, no. 72 (2016): 68150–59. http://dx.doi.org/10.1039/c6ra10717f.

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Seed nanoparticles of Ag, Pt, and Pd (typically ≤4 nm in diameter) were synthesized using tetrakis(hydroxymethyl)phosphonium chloride (THPC) as reducing agent and utilized to prepare Ag, Pt, and Pd nanoshells, as well as hybrid Pt/Ag nanoshells, on silica cores.

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Рудаков, Г. А., А. В. Сосунов, Р. С. Пономарев, В. К. Хеннер, Md Shamin Reza та Gamini Sumanasekera. "Синтез полых углеродных нанооболочек и их применение для суперконденсаторов". Физика твердого тела 60, № 1 (2018): 165. http://dx.doi.org/10.21883/ftt.2018.01.45304.127.

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AbstractThis work is devoted to the study of the synthesis, the description of the structure, and the use of hollow carbon nanoshells 3–5 nm in size. Hollow carbon nanoshells were synthesized by thermolysis of a mixture of nickel acetate and citric acid in the temperature range of 500–700°C. During the chemical reaction, nickel nuclei ~3–5 nm in size are formed, separated from each other by carbon layers. At an annealing temperature of 600°C, the most ordered, close-packed structure is formed, evenly distributed throughout the sample. The etching of nickel with nitric acid resulted in hollow carbon nanoshells with a high specific surface area (~1200 m^2/g) and a homogeneous structure. Raman spectroscopy shows that the graphene-like structure of carbon nanoshells is preserved before and after the etching of nickel, and their defect density does not increase, which enables them to be subjected to new processing (functionalization) in order to obtain additional physical properties. The resulting carbon nanoshells were used as active material of the supercapacitor electrodes. The conducted electrochemical measurements showed that the specific capacitance of the supercapacitor did not fall below 120 F/g at a current density of 0.3 to 3 A after 800 charge/discharge cycles.

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31

Mayle, Kristine M., Kathryn R. Dern, Vincent K. Wong, et al. "Polypeptide-Based Gold Nanoshells for Photothermal Therapy." SLAS TECHNOLOGY: Translating Life Sciences Innovation 22, no. 1 (2016): 18–25. http://dx.doi.org/10.1177/2211068216645292.

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Targeted killing of cancer cells by engineered nanoparticles holds great promise for noninvasive photothermal therapy applications. We present the design and generation of a novel class of gold nanoshells with cores composed of self-assembled block copolypeptide vesicles with photothermal properties. Specifically, poly(L-lysine)60- block-poly(L-leucine)20 (K60L20) block copolypeptide vesicles coated with a thin layer of gold demonstrate enhanced absorption of light due to surface plasmon resonance (SPR) in the near-infrared range. We show that the polypeptide-based K60L20 gold nanoshells have low toxicity in the absence of laser exposure, significant heat generation upon exposure to near-infrared light, and, as a result, localized cytotoxicity within the region of laser irradiation in vitro. To gain a better understanding of our gold nanoshells in the context of photothermal therapy, we developed a comprehensive mathematical model for heat transfer and experimentally validated this model by predicting the temperature as a function of time and position in our experimental setup. This model can be used to predict which parameters of our gold nanoshells can be manipulated to improve heat generation for tumor destruction. To our knowledge, our results represent the first ever use of block copolypeptide vesicles as the core material of gold nanoshells.

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De Matteis, Valeria, Mariafrancesca Cascione, Chiara C. Toma, and Rosaria Rinaldi. "Engineered Gold Nanoshells Killing Tumor Cells: New Perspectives." Current Pharmaceutical Design 25, no. 13 (2019): 1477–89. http://dx.doi.org/10.2174/1381612825666190618155127.

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The current strategies to treat different kinds of cancer are mainly based on chemotherapy, surgery and radiation therapy. Unfortunately, these approaches are not specific and rather invasive as well. In this scenario, metal nano-shells, in particular gold-based nanoshells, offer interesting perspectives in the effort to counteract tumor cells, due to their unique ability to tune Surface Plasmon Resonance in different light-absorbing ranges. In particular, the Visible and Near Infrared Regions of the electromagnetic spectrum are able to penetrate through tissues. In this way, the light absorbed by the gold nanoshell at a specific wavelength is converted into heat, inducing photothermal ablation in treated cancer cells. Furthermore, inert gold shells can be easily functionalized with different types of molecules in order to bind cellular targets in a selective manner. This review summarizes the current state-of-art of nanosystems embodying gold shells, regarding methods of synthesis, bio-conjugations, bio-distribution, imaging and photothermal effects (in vitro and in vivo), providing new insights for the development of multifunctional antitumor drugs.

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Bickford, Lissett R., Robert J. Langsner, Joseph Chang, Laura C. Kennedy, Germaine D. Agollah, and Rebekah Drezek. "Rapid Stereomicroscopic Imaging of HER2 Overexpression inEx VivoBreast Tissue Using Topically Applied Silica-Based Gold Nanoshells." Journal of Oncology 2012 (2012): 1–10. http://dx.doi.org/10.1155/2012/291898.

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Tumor margin detection for patients undergoing breast conservation surgery primarily occurs postoperatively. Previously, we demonstrated that gold nanoshells rapidly enhance contrast of HER2 overexpression inex vivotissue sections. Our ultimate objective, however, is to discern HER2 overexpressing tissue from normal tissue in whole, nonsectioned, specimens to facilitate rapid diagnoses. Here, we use targeted nanoshells to quickly and effectively visualize HER2 receptor expression in intactex vivohuman breast tissue specimens. Punch biopsies of human breast tissue were analyzed after a brief 5-minute incubation with and without HER2-targeted silica-gold nanoshells using two-photon microscopy and stereomicroscopy. Labeling was subsequently verified using reflectance confocal microscopy, darkfield hyperspectral imaging, and immunohistochemistry to confirm levels of HER2 expression. Our results suggest that anti-HER2 nanoshells used in tandem with a near-infrared reflectance confocal microscope and a standard stereomicroscope may potentially be used to discern HER2-overexpressing cancerous tissue from normal tissue in near real time and offer a rapid supplement to current diagnostic techniques.

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Thùy Dương, Vũ Thị, Trịnh Thị Thương, Vũ Dương та ін. "HIỆU ỨNG QUANG NHIỆT CỦA HẠT NANO VÀNG CẤU TRÚC LÕI-VỎ TRONG MÔ". Vietnam Journal of Science and Technology 54, № 1 (2016): 74. http://dx.doi.org/10.15625/0866-708x/54/1/5814.

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This work presents the research results on photothermal effect caused by gold nanoshells Fe3O4/SiO2/Au and SiO2/Au in tissue under illumination of a diode laser continuous light at 808 nm. The results shown that the average temperature of samples injected with 1x108 SiO2/Au and Fe3O4/SiO2/Au nanoshells reach to 58° ± 5°C and 50° ± 5°C, respectively. This temperature can induce the irreversible damage to tissue. The photothermal transduction efficiency h of Fe3O4/SiO2/Au and SiO2/Au shells was determined as 16 % and 22 %, respectively. This study proves that gold nanoshells can be used to destroy the tumor cells by photothermal effect.

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Zhao, Jun, Michael Wallace, and Marites P. Melancon. "Cancer theranostics with gold nanoshells." Nanomedicine 9, no. 13 (2014): 2041–57. http://dx.doi.org/10.2217/nnm.14.136.

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Hao, Encai, Shuyou Li, Ryan C. Bailey, Shengli Zou, George C. Schatz, and Joseph T. Hupp. "Optical Properties of Metal Nanoshells." Journal of Physical Chemistry B 108, no. 4 (2004): 1224–29. http://dx.doi.org/10.1021/jp036301n.

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Lassiter, J. Britt, Javier Aizpurua, Luis I. Hernandez, et al. "Close Encounters between Two Nanoshells." Nano Letters 8, no. 4 (2008): 1212–18. http://dx.doi.org/10.1021/nl080271o.

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Tomchuk, P. M., and V. V. Kulish. "Optical conductivity of metal nanoshells." Journal of Physical Studies 8, no. 2 (2004): 127–36. http://dx.doi.org/10.30970/jps.08.127.

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Abbasi, Jennifer. "Gold Nanoshells Ablate Prostate Tumors." JAMA 322, no. 14 (2019): 1343. http://dx.doi.org/10.1001/jama.2019.15868.

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Karami, Behrouz, Davood Shahsavari, Maziar Janghorban, Rossana Dimitri, and Francesco Tornabene. "Wave Propagation of Porous Nanoshells." Nanomaterials 9, no. 1 (2018): 22. http://dx.doi.org/10.3390/nano9010022.

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This study aims at investigating the wave propagation of porous nanoshells. The Bi-Helmholtz non-local strain gradient theory is employed in conjunction with a higher-order shear deformation shell theory, in order to include the size-dependent effects. The nanoshells are made of a porous functionally graded material (P-FGM), whose properties vary continuously along the thickness direction. A variational approach is here applied to handle the governing equations of the problem, which are solved analytically to compute the wave frequencies and phase velocities as function of the wave numbers. The sensitivity of the wave response is analyzed for a varying porosity volume fraction, material properties, non-local parameters, strain gradient length scales, temperature, humidity, and wave numbers. Based on the results, it is verified that the size-dependence of the response is almost the same to the one of plates, beams and tubes.

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Kustov, E. F. "Molecular Orbital Theory of Nanoshells." Journal of Computational and Theoretical Nanoscience 5, no. 11 (2008): 2144–52. http://dx.doi.org/10.1166/jctn.2008.1111.

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Halas, Naomi. "The Optical Properties of Nanoshells." Optics and Photonics News 13, no. 8 (2002): 26. http://dx.doi.org/10.1364/opn.13.8.000026.

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Hastings, Simon P., Zhaoxia Qian, Pattanawit Swanglap, et al. "Modal interference in spiky nanoshells." Optics Express 23, no. 9 (2015): 11290. http://dx.doi.org/10.1364/oe.23.011290.

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Radloff, Corey, and Naomi J. Halas. "Plasmonic Properties of Concentric Nanoshells." Nano Letters 4, no. 7 (2004): 1323–27. http://dx.doi.org/10.1021/nl049597x.

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Rosemary, M. J., Ian MacLaren, and T. Pradeep. "Carbon onions within silica nanoshells." Carbon 42, no. 11 (2004): 2352–56. http://dx.doi.org/10.1016/j.carbon.2004.05.001.

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Xu, Xianzhen, Behrouz Karami, and Maziar Janghorban. "On the dynamics of nanoshells." International Journal of Engineering Science 158 (January 2021): 103431. http://dx.doi.org/10.1016/j.ijengsci.2020.103431.

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Zhang, Yufei, and Fei Zhang. "Vibration and Buckling of Shear Deformable Functionally Graded Nanoporous Metal Foam Nanoshells." Nanomaterials 9, no. 2 (2019): 271. http://dx.doi.org/10.3390/nano9020271.

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Abstract: This article aims to investigate free vibration and buckling of functionally graded (FG) nanoporous metal foam (NPMF) nanoshells. The first-order shear deformation (FSD) shell theory is adopted and the theoretical model is formulated by using Mindlin’s most general strain gradient theory, which can derive several well-known simplified models. The symmetric and unsymmetric nanoporosity distributions are considered for the structural composition. Hamilton’s principle is employed to deduce the governing equations as well as the boundary conditions. Then, via the Navier solution technique, an analytical solution for the free vibration and buckling of FG NPMF nanoshells is presented. Afterwards, a detailed parametric analysis is conducted to highlight the effects of the nanoporosity coefficient, nanoporosity distribution, length scale parameter, and geometrical parameters on the mechanical behaviors of FG NPMF nanoshells.

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Liu, Yun Fei, and Yan Qing Wang. "Thermo-Electro-Mechanical Vibrations of Porous Functionally Graded Piezoelectric Nanoshells." Nanomaterials 9, no. 2 (2019): 301. http://dx.doi.org/10.3390/nano9020301.

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In this work, we aim to study free vibration of functionally graded piezoelectric material (FGPM) cylindrical nanoshells with nano-voids. The present model incorporates the small scale effect and thermo-electro-mechanical loading. Two types of porosity distribution, namely, even and uneven distributions, are considered. Based on Love’s shell theory and the nonlocal elasticity theory, governing equations and corresponding boundary conditions are established through Hamilton’s principle. Then, natural frequencies of FGPM nanoshells with nano-voids under different boundary conditions are analyzed by employing the Navier method and the Galerkin method. The present results are verified by the comparison with the published ones. Finally, an extensive parametric study is conducted to examine the effects of the external electric potential, the nonlocal parameter, the volume fraction of nano-voids, the temperature rise on the vibration of porous FGPM cylindrical nanoshells.

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Wu, Xingjie, Haitao Zhao, Auginia Natalia, et al. "Exosome-templated nanoplasmonics for multiparametric molecular profiling." Science Advances 6, no. 19 (2020): eaba2556. http://dx.doi.org/10.1126/sciadv.aba2556.

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Exosomes are nanoscale vesicles distinguished by characteristic biophysical and biomolecular features; current analytical approaches, however, remain univariate. Here, we develop a dedicated platform for multiparametric exosome analysis—through simultaneous biophysical and biomolecular evaluation of the same vesicles—directly in clinical biofluids. Termed templated plasmonics for exosomes, the technology leverages in situ growth of gold nanoshells on vesicles to achieve multiselectivity. For biophysical selectivity, the nanoshell formation is templated by and tuned to distinguish exosome dimensions. For biomolecular selectivity, the nanoshell plasmonics locally quenches fluorescent probes only if they are target-bound on the same vesicle. The technology thus achieves multiplexed analysis of diverse exosomal biomarkers (e.g., proteins and microRNAs) but remains unresponsive to nonvesicle biomarkers. When implemented on a microfluidic, smartphone-based sensor, the platform is rapid, sensitive, and wash-free. It not only distinguished biomarker organizational states in native clinical samples but also showed that the exosomal subpopulation could more accurately differentiate patient prognosis.

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WANG, JUN, YUEJIN ZHU, YEJUN WU, CHANGJUN WU, DONGFENG XU, and ZHEN ZHANG. "FABRICATION, ASSEMBLY AND MAGNETIC PROPERTIES OF NICKEL HOLLOW NANOBALLS." Modern Physics Letters B 20, no. 10 (2006): 549–55. http://dx.doi.org/10.1142/s0217984906010469.

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Nanoshells composed of close-packed nickel nanoparticles have been fabricated on sillca spheres via strong interaction between the metallic cations and ions of the support. The nickel hollow nanoballs can be self-assembled via magnetic field-assisted route, which is confirmed by the transmission electron microscopy. The magnetic properties of Ni nanoshells are discussed. It is expected that the prepared method can be extended to the synthesis of other hollow metal spheres.

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