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Silicon nanoparticles

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https://www.readbyqxmd.com/read/28080070/solution-synthesis-of-iodine-doped-red-phosphorus-nanoparticles-for-lithium-ion-battery-anodes
#1
Wei-Chung Chang, Kuan-Wei Tseng, Hsing-Yu Tuan
Red Phosphorus (RP) is a promising anode material for lithium-ion battery due to its earth abundance and a high theoretical capacity of 2596 mA h g-1. Although RP-based anodes for lithium-ion batteries have been reported, they were all in the form of carbon/P composites, including P-graphene, P-graphite, P-CNTs and P-carbon black, in order to improve P's extremely low conductivity and large volume change during cycling process. Here we report the large-scale synthesis of red phosphorus nanoparticles (RPNPs) with sizes ranging from 100 to 200 nm by reacting PI3 with ethylene glycol in the presence of cetyltrimethylammonium bromide (CTAB) in ambient environment...
January 12, 2017: Nano Letters
https://www.readbyqxmd.com/read/28079975/edge-states-and-topological-phase-transitions-in-chains-of-dielectric-nanoparticles
#2
Sergey Kruk, Alexey Slobozhanyuk, Denitza Denkova, Alexander Poddubny, Ivan Kravchenko, Andrey Miroshnichenko, Dragomir Neshev, Yuri Kivshar
Recently introduced field of topological photonics aims to explore the concepts of topological insulators for novel phenomena in optics. Here polymeric chains of subwavelength silicon nanodisks are studied and it is demonstrated that these chains can support two types of topological edge modes based on magnetic and electric Mie resonances, and their topological properties are fully dictated by the spatial arrangement of the nanoparticles in the chain. It is observed experimentally and described how theoretically topological phase transitions at the nanoscale define a change from trivial to nontrivial topological states when the edge mode is excited...
January 12, 2017: Small
https://www.readbyqxmd.com/read/28078888/low-temperature-wet-conformal-nickel-silicide-deposition-for-transistor-technology-through-an-organometallic-approach
#3
Tsung-Han Lin, Tigran Margossian, Michele De Marchi, Maxime Thammasack, Dmitry Y Zemlyanov, Sudhir Kumar, Jakub Jagielski, Li-Qing Zheng, Chih-Jen Shih, Renato Zenobi, Giovanni De Micheli, David Baudouin, Pierre-Emmanuel Gaillardon, Christophe Copéret
The race for performant integrated circuits is nowadays facing a downscale limitation. To overpass this nanoscale limit, modern transistors with complex geometries have flourished allowing higher performance and energy efficiency. Accompany with this breakthrough, challenges toward high-performance devices have emerged on each key preparation step, such as the inhomogeneous coverage issue and thermal-induced short circuit issue of metal silicide formation. In this respect, we developed a two-step organometallic approach for nickel silicide formation under near-ambient temperature...
January 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28078340/biocompatible-cus-based-nanoplatforms-for-efficient-photothermal-therapy-and-chemotherapy-in-vivo
#4
Shuwen Peng, Yuanyuan He, Murat Er, Yuanzhi Sheng, Yueqing Gu, Haiyan Chen
Near-infrared (NIR) photothermal therapy (PTT) is a new approach to ablate cancer without affecting normal tissues. A pivotal concern of PPT is to develop photo-responsive agents with high biocompatibility as well as effective photothermal conversion efficiency. Copper sulfide (CuS) nanoparticles prepared are characterized by their low synthesis cost, wide NIR absorption range, good biocompatibility and favorable NIR photothermal conversion efficiency. CuS nanoparticles were then coated with mesoporous silicon dioxide (SiO2) by the Stober method, and further loaded with anticancer drug doxorubicin (DOX)...
January 12, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28075114/unveiling-the-critical-role-of-polymeric-binders-for-silicon-negative-electrodes-in-lithium-ion-full-cells
#5
Jiagang Xu, Long Zhang, Yikai Wang, Tao Chen, Mohanad Al-Shroofy, Yang-Tse Cheng
Because of its natural abundance and high theoretical specific capacity (3579 mAh g-1, based on Li15Si4), silicon and its composites have been extensively studied as the negative electrode for future high energy density lithium-ion batteries. While the rapid failure due to significant volumetric strain of lithium-silicon reactions makes bulk silicon unsuitable for practical applications, silicon nanoparticles can sustain the large volume changes without fracturing. However, polymeric binders are usually required to maintain the structural integrity of electrodes made of particles...
January 11, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28069501/photothermal-and-biodegradable-polyaniline-porous-silicon-hybrid-nanocomposites-as-drug-carriers-for-combined-chemo-photothermal-therapy-of-cancer
#6
Bing Xia, Bin Wang, Jisen Shi, Yu Zhang, Qi Zhang, Zhenyu Chen, Jiachen Li
: To develop photothermal and biodegradable nanocarriers for combined chemo-photothermal therapy of cancer, polyaniline/porous silicon hybrid nanocomposites had been successfully fabricated via surface initiated polymerization of aniline onto porous silicon nanoparticles in our experiments. As-prepared polyaniline/porous silicon nanocomposites could be well dispersed in aqueous solution without any extra hydrophilic surface coatings, and showed a robust phototherml effect under near-infrared (NIR) laser irradiation...
January 6, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28069231/fabrication-of-redox-and-ph-dual-responsive-magnetic-graphene-oxide-microcapsules-via-sonochemical-method
#7
Linlin Dong, Chao Shi, Lanlan Guo, Ting Yang, Yuexin Sun, Xuejun Cui
In this study, the biocompatible redox and pH dual-responsive magnetic graphene oxide microcapsules (MGOMCs) were prepared by a simple sonochemical method. The disulfide bonds cross-linked the wall of MGOMCs were formed from the hydrosulfuryl on the surface of thiolated graphene oxide, which was synthesized by functionalizing graphene oxide with cysteine, showed an excellent redox-responsive property to control drugs release. Moreover, oleic acid modified Fe3O4 nanoparticles were encapsulated into the microcapsules successfully with the hydrophobic drugs dispersed in the hydroxy silicone oil...
May 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28068318/magnesium-silicide-nanoparticles-as-a-deoxygenation-agent-for-cancer-starvation-therapy
#8
Chen Zhang, Dalong Ni, Yanyan Liu, Heliang Yao, Wenbo Bu, Jianlin Shi
A material that rapidly absorbs molecular oxygen (known as an oxygen scavenger or deoxygenation agent (DOA)) has various industrial applications, such as in food preservation, anticorrosion of metal and coal deoxidation. Given that oxygen is vital to cancer growth, to starve tumours through the consumption of intratumoral oxygen is a potentially useful strategy in fighting cancer. Here we show that an injectable polymer-modified magnesium silicide (Mg2Si) nanoparticle can act as a DOA by scavenging oxygen in tumours and form by-products that block tumour capillaries from being reoxygenated...
January 9, 2017: Nature Nanotechnology
https://www.readbyqxmd.com/read/28066544/controlling-deposition-of-nanoparticles-by-tuning-surface-charge-of-sio2-by-surface-modifications
#9
Johnas Eklöf, Tina Gschneidtner, Samuel Lara-Avila, Kim Nygård, Kasper Moth-Poulsen
The self-assembly of nanoparticles on substrates is relevant for a variety of applications such as plasmonics, sensing devices and nanometer-sized electronics. We investigate the deposition of 60 nm spherical Au nanoparticles onto silicon dioxide (SiO2) substrates by changing the chemical treatment of the substrate and by that altering the surface charge. The deposition is characterized by scanning electron microscopy (SEM). Kelvin probe force microscopy (KPFM) was used to characterize the surface workfunction...
November 13, 2016: RSC Advances
https://www.readbyqxmd.com/read/28064420/iron-incorporation-in-biosilica-of-the-marine-diatom-stephanopyxis%C3%A2-turris-dispersed-or-clustered
#10
Janine Kaden, Stephan I Brückner, Susanne Machill, Christoph Krafft, Andreas Pöppl, Eike Brunner
Iron incorporation into diatom biosilica was investigated for the species Stephanopyxis turris. It is known that several "foreign" elements (e.g., germanium, titanium, aluminum, zinc, iron) can be incorporated into the siliceous cell walls of diatoms in addition to silicon dioxide (SiO2). In order to examine the amount and form of iron incorporation, the iron content in the growth medium was varied during cultivation. Fe:Si ratios of isolated cell walls were measured by ICP-OES. SEM studies were performed to examine of a possible influence of excess iron during diatom growth upon cell wall formation...
January 7, 2017: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/28057421/preparation-and-biological-evaluation-of-ethionamide-mesoporous-silicon-nanoparticles-against-mycobacterium-tuberculosis
#11
Nuno Vale, Alexandra Correia, Sara Silva, Patrícia Figueiredo, Ermei Mäkilä, Jarno Salonen, Jouni Hirvonen, Jorge Pedrosa, Hélder A Santos, Alexandra Fraga
Ethionamide (ETH) is an important second-line antituberculosis drug used for the treatment of patients infected with multidrug-resistant Mycobacterium tuberculosis. Recently, we reported that the loading of ETH into thermally carbonized-porous silicon (TCPSi) nanoparticles enhanced the solubility and permeability of ETH at different pH-values and also increased its metabolization process. Based on these results, we synthesized carboxylic acid functionalized thermally hydrocarbonized porous silicon nanoparticles (UnTHCPSi NPs) conjugated with ETH and its antimicrobial effect was evaluated against Mycobacterium tuberculosis strain H37Rv...
December 26, 2016: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/28052201/rice-husk-silica-derived-nanomaterials-for-battery-applications-a-literature-review
#12
Yafei Shen
Silica-rich rice husk (RH) is an abundant and sustainable agricultural waste. The recovery of value added products from RH or its ash to explore an economic way for the valorization of agricultural wastes have attracted wide attention. For instance, RH can be converted to biofuels and biochars simultaneously via thermochemical processes. In general, the applications of RH biochars include soil remediation, pollutants removal, silicon battery materials, etc. This review article concludes recent progresses in the synthesis of RH-derived silicon materials for lithium-ion batteries (LIBs) applications...
January 4, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28047137/su-g-iep3-10-molecular-imaging-with-clinical-x-ray-sources-and-compton-cameras
#13
D Vernekohl, M Ahmad, G Chinn, L Xing
PURPOSE: The application of Compton cameras (CC) is a novel approach translating XFCT to a practical modality realized with clinical CT systems without the restriction of pencil beams. The dual modality design offers additional information without extra patient dose. The purpose of this work is to investigate the feasibility and efficacy of using CCs for volumetric x-ray fluorescence (XF) imaging by Monte Carlo (MC) simulations and statistical image reconstruction. METHODS: The feasibility of a CC for imaging x-ray fluorescence emitted from targeted lesions is examined by MC simulations...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046374/su-g-iep3-07-high-resolution-high-sensitivity-imaging-and-quantification-of-intratumoral-distributions-of-gold-nanoparticles-using-a-benchtop-l-shell-xrf-imaging-system
#14
N Manohar, F Reynoso, P Diagaradjane, S Krishnan, S Cho
PURPOSE: To demonstrate the ability to perform high-resolution imaging and quantification of sparse distributions of gold nanoparticles (GNPs) within ex vivo tumor samples using a highly-sensitive benchtop L-shell x-ray fluorescence (XRF) imaging system. METHODS: An optimized L-shell XRF imaging system was assembled using a tungsten-target x-ray source (operated at 62 kVp and 45 mA). The x-rays were filtered (copper: 0.08 mm & aluminum: 0.04 mm) and collimated (lead: 5 cm thickness, 3 cm aperture diameter) into a cone-beam in order to irradiate small samples or objects...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28045497/giant-temperature-coefficient-of-resistivity-and-cryogenic-sensitivity-in-silicon-with-galvanically-displaced-gold-nanoparticles-in-freeze-out-region
#15
Seung-Hoon Lee, Seongpil Hwang, Jae-Won Jang
The temperature coefficient of resistivity (TCR) and cryogenic sensitivity (Sv) of p-type silicon (p-Si) in the low-temperature region (10-30 K) are remarkably improved by increasing the coverage of galvanically displaced Au nanoparticles (NPs). By increasing the galvanic displacement time from 10 s to 30 s, the average surface roughness (Ra) of the samples increases from 0.31 to 2.31 nm, and the coverage rate of Au NPs increases from 3.1% to 21.9%. In the freeze-out region of the sample, an up to 35% increase of TCR and dramatically improved Sv of p-Si (~ 5785%) are observed with Au coverage of 21...
January 3, 2017: ACS Nano
https://www.readbyqxmd.com/read/28042335/targeting-of-magnetic-nanoparticle-coated-microbubbles-to-the-vascular-wall-empowers-site-specific-lentiviral-gene-delivery-in-vivo
#16
Yvonn Heun, Staffan Hildebrand, Alexandra Heidsieck, Bernhard Gleich, Martina Anton, Joachim Pircher, Andrea Ribeiro, Olga Mykhaylyk, Dietmar Eberbeck, Daniela Wenzel, Alexander Pfeifer, Markus Woernle, Florian Krötz, Ulrich Pohl, Hanna Mannell
In the field of vascular gene therapy, targeting systems are promising advancements to improve site-specificity of gene delivery. Here, we studied whether incorporation of magnetic nanoparticles (MNP) with different magnetic properties into ultrasound sensitive microbubbles may represent an efficient way to enable gene targeting in the vascular system after systemic application. Thus, we associated novel silicon oxide-coated magnetic nanoparticle containing microbubbles (SO-Mag MMB) with lentiviral particles carrying therapeutic genes and determined their physico-chemical as well as biological properties compared to MMB coated with polyethylenimine-coated magnetic nanoparticles (PEI-Mag MMB)...
2017: Theranostics
https://www.readbyqxmd.com/read/28028929/molecular-genetic-and-biochemical-responses-in-human-airway-epithelial-cell-cultures-exposed-to-titanium-nanoparticles-in-vitro
#17
Elanur Aydın, Hasan Türkez, Fazıl Hacımüftüoğlu, Abdulgani Tatar, Fatime Geyikoğlu
Titanium nanoparticles (NPs) have very wide application areas such as paint, cosmetics, pharmaceuticals and biomedical applications. And, to translate these nanomaterials to the clinic and industrial domains, their safety needs to be verified, particularly in terms of genotoxicity and cytotoxicity. Therefore, in this study, we aimed to investigate of cytotoxicity and changes in gene expression profiles influenced by commonly titanium (as titanium carbide, titanium carbo-nitride, titanium (II) oxide, titanium (III) oxide, titanium (IV) oxide, titanium nitride, titanium silicon oxide) NPs in human alveolar epithelial (HPAEpiC) and pharynx (HPPC) cell lines in vitro since inhalation is an important pathway for exposure to these nanoparticles...
December 28, 2016: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/28026186/the-use-of-graphene-and-its-derivatives-for-liquid-phase-transmission-electron-microscopy-of-radiation-sensitive-specimens
#18
Hoduk Cho, Matthew R Jones, Son C Nguyen, Matthew R Hauwiller, Alex Zettl, A Paul Alivisatos
One of the key challenges facing liquid-phase transmission electron microscopy (TEM) of biological specimens has been the damaging effects of electron beam irradiation. The strongly ionizing electron beam is known to induce radiolysis of surrounding water molecules, leading to the formation of reactive radical species. In this study, we employ DNA-assembled Au nanoparticle superlattices (DNA-AuNP superlattices) as a model system to demonstrate that graphene and its derivatives can be used to mitigate electron beam-induced damage...
December 28, 2016: Nano Letters
https://www.readbyqxmd.com/read/28024346/multifunctional-silicon-optoelectronics-integrated-with-plasmonic-scattering-color
#19
Long Wen, Qin Chen, Xin Hu, Huacun Wang, Lin Jin, Qiang Su
Plasmonic scattering from metallic nanoparticles has been used for centuries to create the colorful appearance of stained glass. Besides their use as passive spectral filtering components, multifunctional optoelectronic applications can be achieved by integrating the nanoscatters with semiconductors that generate electricity using the complementary spectral components of plasmonic colors. To suppress the usual degradation of both efficiency and the gamut of plasmonic scattering coloration in highly asymmetric index configurations like a silicon host, aluminum nanodisks on indium tin oxide (ITO) coated silicon were experimentally studied and demonstrated color sorting in the full visible range along with photocurrent generation...
December 27, 2016: ACS Nano
https://www.readbyqxmd.com/read/28010112/peptide-engineered-microcantilevers-for-selective-chemical-force-microscopy-and-monitoring-of-nanoparticle-capture
#20
Martin Munz, Angelo Bella, Santanu Ray, Nia C Bell, Alexander G Shard, Caterina Minelli
Engineered peptides capable of binding to silica have been used to provide contrast in chemical force microscopy and tested for their capacity to selectively capture silica nanoparticles (NPs). Gold coated atomic force microscopy (AFM) microcantilevers with integrated tips and colloidal probes were functionalized with engineered peptides through a thiol group of a terminal cysteine which was linked via a glycine trimer to a 12-mer binding sequence. The functionalized probes demonstrated a significantly increased binding force on silicon oxide areas of a gold-patterned silicon wafer, whereas plain gold probes, and those functionalized with a random permutation of the silica binding peptide motif or an all-histidine sequence displayed similar adhesion forces to gold and silicon oxide...
December 23, 2016: Biointerphases
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