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https://www.readbyqxmd.com/read/28437968/vortex-energy-flows-generated-by-core-shell-nanospheres
#1
Shih-Wen Chen, Jia-Han Li
Investigated in this paper is the interaction of light and the nanospheres composed by a dielectric core with a gold-shell cladding that causes the optical vortices inside the core and the whirlpools around the shell. Different radius ratios, dimensions and the dielectric functions of nanospheres were studied using the finite-difference time-domain method. It was found that optical vortices were most likely to occur in the regions of increased absorption cross section and reduced scattering cross section. Two optical vortices of the opposite polarity, each centered in one of the particles of a dimer are created by a nanoshell dimer...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28428422/quantitative-3d-evolution-of-colloidal-nanoparticle-oxidation-in-solution
#2
Yugang Sun, Xiaobing Zuo, Subramanian K R S Sankaranarayanan, Sheng Peng, Badri Narayanan, Ganesh Kamath
Real-time tracking of the three-dimensional (3D) evolution of colloidal nanoparticles in solution is essential for understanding complex mechanisms involved in nanoparticle growth and transformation. We used time-resolved small-angle and wide-angle x-ray scattering simultaneously to monitor oxidation of highly uniform colloidal iron nanoparticles, enabling the reconstruction of intermediate 3D morphologies of the nanoparticles with a spatial resolution of ~5 angstroms. The in situ observations, combined with large-scale reactive molecular dynamics simulations, reveal the details of the transformation from solid metal nanoparticles to hollow metal oxide nanoshells via a nanoscale Kirkendall process-for example, coalescence of voids as they grow and reversal of mass diffusion direction depending on crystallinity...
April 21, 2017: Science
https://www.readbyqxmd.com/read/28426070/controllable-synthesis-of-ferromagnetic-antiferromagnetic-core-shell-nws-with-tunable-magnetic-properties
#3
M Irfan, C J Wang, U Khan, W J Li, X M Zhang, W J Kong, P Liu, C H Wan, Y W Liu, X F Han
Several nanotechnology applications are based on the promising scheme of highly anisotropic magnetic nanomaterials. Using this idea, we investigated the structure, magnetic properties, and interfacial exchange anisotropy effects of the Ni/Cr2O3 and Fe/Cr2O3 core-shell nanowires (NWs) geometry. A template-based strategy was developed to synthesize Ni (Fe)-Cr2O3 core-shell NWs, which combines a wet-chemical route and electrodeposition within the nanopores of the membranes. Structural determination in correlation with magnetic testing shows that the crystalline Cr2O3-nanoshells (NSs) cause an enhanced exchange bias, providing an extra source of anisotropy that leads to their magnetic stability...
April 20, 2017: Nanoscale
https://www.readbyqxmd.com/read/28423503/rap2b-sirna-significantly-enhances-the-anticancer-therapeutic-efficacy-of-adriamycin-in-a-gold-nanoshell-based-drug-gene-co-delivery-system
#4
Li Ding, Ruonan Sun, Xinyue Zhang
Rap2b is a novel p53 target we have identified recently. Knockdown of Rap2b sensitizes HCT116 cells to adriamycin-induced apoptosis, indicating that Rap2b promotes adriamycin resistance in cancer cells. In the present study, we designed a nanostructure-based drug/gene delivery system to evaluate the potential of Rap2b siRNA as a therapeutic agent against human cancers. Specifically, after co-incubated with HCT116 cells, adriamycin- and Rap2b siRNA-loaded gold nanoshells were internalized. Subsequent laser irradiation promoted release of adriamycin and Rap2b siRNA from the nanoparticles...
March 28, 2017: Oncotarget
https://www.readbyqxmd.com/read/28395484/preparation-and-angle-dependent-optical-properties-of-brown-al-mno2-composite-pigments-in-visible-and-infrared-region
#5
Yunfeng Liu, Jianliang Xie, Mei Luo, Bo Peng, Longjiang Deng
Traditional low infrared emissivity coatings based on aluminum flakes cannot own low IR emissivity and low lightness simultaneously. Herein, a new simple efficient method for the synthesis of brown Al/MnO2 composite pigments with low IR emissivity and low lightness is reported, through forming MnO2 layer on aluminum flakes by thermal cracking, then altering the shape and forming nanoshell by stirring in hot flowing liquid. The results indicate that the MnO2 particles, which have tetragonal structure with high crystallinity, are needlelike and forming a complete shell on the aluminum flakes...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28371376/a-smart-responsive-dual-aptamers-targeted-bubble-generating-nanosystem-for-cancer-triplex-therapy-and-ultrasound-imaging
#6
Feifei Zhao, Jie Zhou, Xiangjie Su, Yuhui Wang, Xiaosa Yan, Shaona Jia, Bin Du
The absence of targeted, single treatment methods produces low therapeutic value for treating cancers. To increase the accumulation of drugs in tumors and improve the treatment effectiveness, near-infrared 808 nm photothermal responsive dual aptamers-targeted docetaxel (DTX)-containing nanoparticles is proposed. In this system, DTX and NH4 HCO3 are loaded in thermosensitive liposomes. The surface of liposomes is coated with gold nanoshells and connected with sulfydryl (SH) modified AS1411 and S2.2 aptamers...
March 30, 2017: Small
https://www.readbyqxmd.com/read/28363771/gold-nanoshell-based-betulinic-acid-liposomes-for-synergistic-chemo-photothermal-therapy
#7
Yanping Liu, Xuwu Zhang, Zhiwei Liu, Longgang Wang, Liyao Luo, Meili Wang, Qianqian Wang, Dawei Gao
A novel synthesis approach is first developed to fabricate a multifunctional smart nanodrug delivery system: gold nanoshell-coated betulinic acid liposomes (AuNS-BA-Lips) mediated by a glutathione. The AuNS-BA-Lips exhibited good size distribution (149.4±2.4nm), preferable photothermal conversion ability and synergistic chemo-photothermal therapy. Additionally, the absorption wavelength of AuNS-BA-Lips showed a significantly red-shifted to near infrared (NIR) region, which can strongly absorbed NIR laser and efficiently convert it into localized heat, thus providing controlled drug release and antitumor thermotherapy...
March 29, 2017: Nanomedicine: Nanotechnology, Biology, and Medicine
https://www.readbyqxmd.com/read/28362735/silicon-gold-core-shell-nanowire-array-for-an-optically-and-electrically-characterized-refractive-index-sensor-based-on-plasmonic-resonance-and-schottky-junction
#8
Linling Qin, Cheng Zhang, Runfeng Li, Xiaofeng Li
This work reports the plasmonically enhanced refractive index sensor consisting of silicon nanowire array (Si-NWA) coated by a conformal gold (Au) nanoshell. Compared to the pure Si or Au NWA system, the Si-Au core-shell setup leads to substantially enhanced optical in-coupling to excite strong surface plasmon resonance (SPR) for highly sensitive sensors. Results indicate that the SPR wavelength can be subtly tuned by manipulating the nanowire radius, and it shows a strong shift with very small variation of the refractive index of the analyte...
April 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28300393/remote-control-and-modulation-of-cellular-events-by-plasmonic-gold-nanoparticles-implications-and-opportunities-for-biomedical-applications
#9
Jiayang Li, Jing Liu, Chunying Chen
Compared to traditional hyperthermia methods, gold nanoparticles (Au NPs) successfully achieve site-specific incremental temperature in deep tissues. By virtue of near-infrared (NIR) laser-mediated photothermal treatment, Au NPs have been widely explored in clinical and preclinical applications, including cancer therapy and tissue engineering. In this issue of ACS Nano, Suzuki, Ciofani, and colleagues demonstrate how gold nanoshells can remotely activate striated muscle cells via inducing myotube contraction and modulating related gene expression by mild heat stimulation under NIR irradiation...
March 28, 2017: ACS Nano
https://www.readbyqxmd.com/read/28251053/laser-triggered-small-interfering-rna-releasing-gold-nanoshells-against-heat-shock-protein-for-sensitized-photothermal-therapy
#10
Zhaohui Wang, Siwen Li, Min Zhang, Yi Ma, Yuxi Liu, Weidong Gao, Jiaqi Zhang, Yueqing Gu
The resistance of cancer cells to photothermal therapy is closely related to the overexpression of heat shock proteins (HSPs), which are abnormally upregulated when cells are under lethal stresses. Common strategies that use small molecule inhibitors against HSPs to enhance hyperthermia effect lack spatial and temporal control of drug release, leading to unavoidable systemic toxicity. Herein, a versatile photothermal platform is developed which is composed of a hollow gold nanoshell core densely packed with small interfering RNAs against heat shock protein 70 (Hsp70)...
February 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/28245425/intra-arterial-delivery-of-superparamagnetic-iron-oxide-nanoshell-and-polyvinyl-alcohol-based-chemoembolization-system-for-the-treatment-of-liver-tumor
#11
Qi Liang, Yi-Xiang Wang, Jin-Song Ding, Wei He, Ling-Ling Deng, Na Li, Yun-Jie Liao, Zhen Li, Bin Ye, Wei Wang
A superparamagnetic iron oxide (SPIO) nanoshell and polyvinyl alcohol (PVA) based chemoembolization system for anti-cancer drug doxorubicin (DOX) delivery has previously been presented. We have also previously confirmed the feasibility and safety of this multifunctional system for carrying both DOX and SPIO nanoparticles in vitro. However, the pharmacokinetic and the therapeutic efficacy of this novel drug-delivery system in vivo is not yet clear, and as such was the subject of this study. A rabbit liver tumor model was utilized, whereby the tumors were targeted by SPIO/DOX/PVA composite infused via a catheter into the hepatic arteries which supplying blood to the tumor...
January 2017: Discovery Medicine
https://www.readbyqxmd.com/read/28244304/synthesis-of-ultrasmall-platinum-nanoparticles-on-polymer-nanoshells-for-size-dependent-catalytic-oxidation-reactions
#12
Licheng Bai, Shumeng Zhang, Qiang Chen, Chuanbo Gao
It is highly desirable for the synthesis and stabilization of noble metal nanoparticles of uniform, precisely tunable sizes, especially in the range of angstroms to a few nanometers, for many catalytic applications in pursuit of optimal activity and selectivity. Herein, we report a novel strategy for the synthesis of uniform platinum (Pt) nanoparticles of ultrasmall sizes (average size: 0.9-2.3 nm), which are stabilized on hollow polymer nanoshells formed by polymerization of sodium dodecyl benzenesulfonate (SDBS) at the interface of an ethanol/water emulsion...
March 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28221348/self-assembly-of-nanoparticles-into-biomimetic-capsid-like-nanoshells
#13
Ming Yang, Henry Chan, Gongpu Zhao, Joong Hwan Bahng, Peijun Zhang, Petr Král, Nicholas A Kotov
Nanoscale compartments are one of the foundational elements of living systems. Capsids, carboxysomes, exosomes, vacuoles and other nanoshells easily self-assemble from biomolecules such as lipids or proteins, but not from inorganic nanomaterials because of difficulties with the replication of spherical tiling. Here we show that stabilizer-free polydispersed inorganic nanoparticles (NPs) can spontaneously organize into porous nanoshells. The association of water-soluble CdS NPs into self-limited spherical capsules is the result of scale-modified electrostatic, dispersion and other colloidal forces...
March 2017: Nature Chemistry
https://www.readbyqxmd.com/read/28217783/controlled-formation-of-uniform-nanoshells-of-manganese-oxide-and-their-potential-in-lithium-ion-batteries
#14
Xiao-Chan Liu, Jun-Yu Piao, De-Shan Bin, Tian-Qi Zhang, Shu-Yi Duan, Zi-Xiao Wu, An-Min Cao, Li-Jun Wan
Uniform nanoshells of manganese oxides have been successfully prepared by controlling their growth kinetics in solution. The prepared manganese oxides show promising electrochemical performance when used as an anode material in lithium ion batteries.
February 20, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28198628/protection-of-photosynthetic-algae-against-ultraviolet-radiation-by-one-step-ceo2-shellization
#15
Pengqiang Duan, Tingting Huang, Wei Xiong, Lei Shu, Yuling Yang, Changyu Shao, Xurong Xu, Weimin Ma, Ruikang Tang
Photosynthetic microalgae play an important role in solar-to-chemical energy conversion on Earth, but the increasing solar ultraviolet (UV) radiation seriously reduces the biological photosynthesis. Here, we developed a one-step approach to construct cell-in-shell hybrid structure by using direct adsorption of CeO2 nanoparticles onto cells. The engineered CeO2 nanoshell can efficiently protect the enclosed Chlorella cell due to its excellent UV filter property, which can also eliminate UV-induced oxidative stress...
February 22, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28197024/nanotechnology-in-urology
#16
REVIEW
Sudhindra Jayasimha
INTRODUCTION: Nanotechnology has revolutionized our approach to medical diagnostics as well as therapeutics and has spanned an entirely new branch of research. This review addresses the potential applications of Nanotechnology in Urology. This article is based on the Dr. Sitharaman Best Essay award of the Urological Society of India for 2016. METHODS: A PubMed search was performed for all relevant articles using the terms, "nanotechnology, nanoparticles, nanoshells, nanoscaffolds, and nanofibers...
January 2017: Indian Journal of Urology: IJU: Journal of the Urological Society of India
https://www.readbyqxmd.com/read/28193331/colorimetric-enumeration-of-bacterial-contamination-in-water-based-on-%C3%AE-galactosidase-gold-nanoshell-activity
#17
Fouzia Tanvir, Atif Yaqub, Shazia Tanvir, William A Anderson
In this study we report a method for the rapid and sensitive estimation of bacterial cell concentration in solution based on a colorimetric enzyme/gold nanoshells conjugate system. The CTAB capped gold nanoshells are electrostatically attracted by both the bacterial surface and the enzyme β-galactosidase. The preferential binding of cationic (CTAB)-functionalized gold nanoshells to the more negative bacterial surfaces leaves active β-galactosidase in solution, providing an enzyme-amplified colorimetric response of the binding event...
April 2017: Enzyme and Microbial Technology
https://www.readbyqxmd.com/read/28150199/fabrication-of-photothermal-stable-gold-nanosphere-mesoporous-silica-hybrid-nanoparticle-responsive-to-near-infrared-light
#18
Bei Cheng, Peisheng Xu
Various gold nanoparticles have been explored in biomedical systems and proven to be promising in photothermal therapy and drug delivery. Among them, nanoshells were regarded as traditionally strong near infrared absorbers that have been widely used to generate photothermal effect for cancer therapy. However, the nanoshell is not photo-thermal stable and thus is not suitable for repeated irradiation. Here, we describe a novel discrete gold nanostructure by mimicking the continuous gold nanoshell-gold/mesoporous silica hybrid nanoparticle (GoMe)...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28150198/multifunctionalization-of-gold-nanoshells
#19
Sandra W Bishnoi, Yujen Lin
Gold silica nanoshells have found many applications within the field of molecular biology, including as nanoscale sensors, the detection of biomarkers, and in the treatment of solid tumors using photothermal ablation. In order for them to be targeted to specific biomarkers while also remaining stable in biological media, it is often necessary to modify their surfaces with more than one functional group. Here, we describe how to create multifunctional gold nanoshells that can be used to either target specific tumor types in vivo or for the detection of biomarkers using biological specimen...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28107625/gold-nanoshell-mediated-remote-myotube-activation
#20
Attilio Marino, Satoshi Arai, Yanyan Hou, Andrea Degl'Innocenti, Valentina Cappello, Barbara Mazzolai, Young-Tae Chang, Virgilio Mattoli, Madoka Suzuki, Gianni Ciofani
Mild heat stimulation of muscle cells within the physiological range represents an intriguing approach for the modulation of their functions. In this work, photothermal conversion was exploited to remotely stimulate striated muscle cells by using gold nanoshells (NSs) in combination with near-infrared (NIR) radiation. Temperature increments of approximately 5 °C were recorded by using an intracellular fluorescent molecular thermometer and were demonstrated to efficiently induce myotube contraction. The mechanism at the base of this phenomenon was thoroughly investigated and was observed to be a Ca(2+)-independent event directly involving actin-myosin interactions...
March 28, 2017: ACS Nano
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