Read by QxMD icon Read

Silicon nanoparticles

Xiaoning Li, Canan Schumann, Hassan A Albarqi, Christopher J Lee, Adam W G Alani, Shay Bracha, Milan Milovancev, Olena Taratula, Oleh Taratula
Fluorescence image-guided surgery combined with intraoperative therapeutic modalities has great potential for intraoperative detection of oncologic targets and eradication of unresectable cancer residues. Therefore, we have developed an activatable theranostic nanoplatform that can be used concurrently for two purposes: (1) tumor delineation with real-time near infrared (NIR) fluorescence signal during surgery, and (2) intraoperative targeted treatment to further eliminate unresected disease sites by non-toxic phototherapy...
2018: Theranostics
Suyun Tian, Guannan Zhu, Yanping Tang, Xiaohua Xie, Qian Wang, Yufei Ma, Gu Qiao Ding, Xiaoming Xie
Various graphene-based Si nanocomposites have been reported to improve the performance of active materials in Li ion battery. However, these candidates still yield severe capacity fading due to the electrical disconnection and fracture caused by huge volume changes with extended cycles.Therefore, we design a novel three-dimensional cross-linking structure of graphene and single-wall carbon nanotube to encapsulate Si nanoparticles. The synthesized three-dimensional structure is ascribed to the excellent self-assembly of carbon nanotube with graphene oxide and a thermal treatment process at 900 ºC...
January 17, 2018: Nanotechnology
Huitian Liu, Zhongqiang Shan, Wenlong Huang, Dongdong Wang, Zejing Lin, Zongjie Cao, Peng Chen, Shuxian Meng, Li Chen
The utilization of silicon/carbon composites as anode materials to replace the commercial graphite is hampered by their tendency to huge volumetric expansion, costly raw materials, and complex synthesis processes in lithium-ion batteries. Herein, self-assembly method is successfully applied to prepare hierarchical silicon nanoparticles@oxidized mesocarbon microbeads/carbon (Si@O-MCMB/C) composites for the first time, in which O-MCMB core and low-cost sucrose-derived carbon shell not only effectively enhance the electrical conductivity of the anode, but also mediate the dramatic volume change of silicon during cycles...
January 16, 2018: ACS Applied Materials & Interfaces
Franz Wegner, Thomas Friedrich, Nikolaos Panagiotopoulos, Sarah Vaalma, Jan Peter Goltz, Florian M Vogt, Martin A Koch, Thorsten M Buzug, Joerg Barkhausen, Julian Haegele
Magnetic Particle Imaging (MPI) is a three-dimensional imaging method which visualizes the spatial distribution of Superparamagnetic Iron Oxide Nanoparticles (SPIOs) with oscillating and static magnetic fields. It is a quantitative method as the intensity of its signal is proportional to the concentration of the SPIOs. Due to its quantitativeness, high temporal resolution and kidney-safe tracers it is proposed to be a very promising noninvasive method for cardiovascular imaging. In this regard MPI in the presence of endovascular stents and assessment of stent patency with MPI has to be evaluated...
January 15, 2018: Physics in Medicine and Biology
Uroš Prah, Irena Kozjek Škofic
The temperature dependence of the anatase-to-rutile phase transition of TiO2 powders and thin films was studied. In order to shift the phase transition to higher temperature, samples were doped with a different amount of phosphate ions and their influence on the structure and thermal stability of the anatase phase was investigated. In addition, the effect of the catalyst form (powders or thin films) on the temperature of the anatase-to-rutile phase transition was observed. TiO2 thin films and powders were prepared using a simple sol-gel method with an alkoxide precursor and citric acid...
December 2017: Acta Chimica Slovenica
Minh Tran, Alison Whale, Sonal Padalkar
Noble transition metals, like palladium (Pd) and platinum (Pt), have been well-known for their excellent catalytic and electrochemical properties. However, they have been considered non-active for surface enhanced Raman spectroscopy (SERS). In this work, we explore the scattering contributions of Pd and Pt for the detection of organic molecules. The Pd and Pt nanostructures were synthesized on silicon substrate using a modified galvanic displacement method. The results show Pt nanoparticles and dendritic Pd nanostructures with controlled density and size...
January 7, 2018: Sensors
Yi Hou, Zhen Wang, Chao Cai, Xi Hao, Dongdong Li, Ning Zhao, Yiping Zhao, Li Chen, Hongwei Ma, Jian Xu
Assembling nanoparticles (NPs) on various surfaces are intensively investigated for the construction of functional nanocoatings; however, it is still a challenge to fabricate conformal nanocoatings uniformly on surfaces having micro- or nanostructures. Herein, it is demonstrated that the negatively charged SiO2 NPs and the positively charged silicon coupling agent can be assembled layer-by-layer on the microstructures based on the combination of electrostatic interaction and condensation reaction. Conformal nanocoatings with controllable thickness are formed on the microstructured surfaces with different compositions and morphologies...
January 5, 2018: Advanced Materials
P Sela, S Peukert, J Herzler, M Fikri, C Schulz
The decomposition of tetramethylsilane was studied in shock-tube experiments in a temperature range of 1270-1580 K and pressures ranging from 1.5 to 2.3 bar behind reflected shock waves combining gas chromatography/mass spectrometry (GC/MS) and high-repetition-rate time-of-flight mass spectrometry (HRR-TOF-MS). The main observed products were methane (CH4), ethylene (C2H4), ethane (C2H6), and acetylene (C2H2). In addition, the formation of a solid deposit was observed, which was identified to consist of silicon- and carbon-containing nanoparticles...
January 5, 2018: Physical Chemistry Chemical Physics: PCCP
Katharina Theis-Broehl, Erika C Vreeland, Andrew Gomez, Dale L Huber, Apurve Saini, Max Wolff, Brian Maranville, Erik Brok, Kathryn L Krycka, Joseph A Dura, Julie A Borchers
This article describes the 3D self-assembly of monodisperse colloidal magnetite nanoparticles from a dilute water-based ferrouid onto a silicon surface and the dependence of the resultant magnetic structure with applied field. The nanoparticles assemble into close-packed layers at the surface followed by more loosely-packed ones. The magnetic field-dependent magnetization of the individual nanoparticle layers depends on both the rotational freedom of the layer and the magnetization of the adjacent layers. For layers in which the nanoparticles are more free to rotate, the easy axis of the nanoparticle can readily orient along the field direction...
January 4, 2018: ACS Applied Materials & Interfaces
Qinqin Huang, Yin Wang, Xingxiang Chen, Yimeng Wang, Zhiqiang Li, Shiming Du, Lianrong Wang, Shi Chen
Circulating tumor cells (CTCs) are cancer cells that shed from a primary tumor and circulate in the bloodstream. As a form of "tumor liquid biopsy", CTCs provide important information for the mechanistic investigation of cancer metastasis and the measurement of tumor genotype evolution during treatment and disease progression. However, the extremely low abundance of CTCs in the peripheral blood and the heterogeneity of CTCs make their isolation and characterization major technological challenges. Recently, nanotechnologies have been developed for sensitive CTC detection; such technologies will enable better cell and molecular characterization and open up a wide range of clinical applications, including early disease detection and evaluation of treatment response and disease progression...
2018: Nanotheranostics
Alexander Davis, Salvatore Surdo, Gianvito Caputo, Ilker S Bayer, Athanassia Athanassiou
Superhydrophobic materials hold an enormous potential in sectors as important as aerospace, food industries or biomedicine. Despite this great promise, the lack of environmentally friendly production methods and limited robustness remain the two most pertinent barriers to the scalability, large-area production and widespread use of superhydrophobic materials. In this work, highly robust superhydrophobic silicone monoliths are produced through a scalable and environmentally friendly emulsion technique. It is first found that stable and surfactantless water-in-polydimethylsiloxane (PDMS) emulsions can be formed through mechanical mixing...
December 29, 2017: ACS Applied Materials & Interfaces
Ting Song, Piyong Zhang, Tingting Wang, Atif Ali, Heping Zeng
Exploiting solar power for hydrogen production from seawater is a great challenge owing to the corrosive properties of seawater and inadequate visible-light conversion capabilities. Here we report an uncomplicated post-processing method to construct Ti3+ self-doped titanium-silicon material with corrosion resistance. This is a new experimental method to regulate the electrical, optical, and photocatalytic performances of titanium-containing photocatalysts in a controlled way. Moreover, we demonstrate that Ti-O-Si materials with different calcination temperatures can serve as a highly efficient and convenient catalyst for photogeneration of hydrogen from water and simulated seawater...
December 20, 2017: Nanoscale
R L Yang, Y P Zheng, T Y Wang, P P Li, Y D Wang, D D Yao, L X Chen
A series of core/shell nanoparticle organic/inorganic hybrid materials (NOHMs) with different weight ratios of two components, consisting of multi-walled carbon nanotubes (MWCNTs) and silicon dioxide (SiO2) as the core were synthesized. The NOHMs display a liquid-like state in the absence of solvent at room temperature. Five NOHMs were categorized into three kinds of structure states based on different weight ratio of two components in the core, named the power strip model, the critical model and the collapse model...
December 15, 2017: Nanotechnology
Nicasio R Geraldi, Linzi E Dodd, Ben Xu, David Wood, Gary Wells, Glen McHale, Michael I Newton
Much of the inspiration for the creation of superhydrophobic surfaces has come from nature, from plant such as the Sacred Lotus (Nulembo nucifera), where the micro-scale papillae epidermal cells on the surfaces of the leaves are covered with nano-scale epicuticular wax crystalloids. The combination of the surface roughness and the hydrophobic wax coating produces a superhydrophobic wetting state on the leaves allowing them to self-clean and easily shed water. Here a simple scale-up carbon nanoparticle spray coating is presented that mimics the surface of the Sacred Lotus leaves and can be applied to a wide variety of materials, complex structures, and flexible substrates, rendering them superhydrophobic, with contact angles above 160°...
December 14, 2017: Bioinspiration & Biomimetics
Meng-Hsuen Chiu, Zafir A Khan, Santiago G Garcia, Andre D Le, Agnes Kagiri, Javier Ramos, Shih-Ming Tsai, Hunter W Drobenaire, Peter H Santschi, Antonietta Quigg, Wei-Chun Chin
Engineered nanoparticles (ENPs), products from modern nanotechnologies, can potentially impact the marine environment to pose serious threats to marine ecosystems. However, the cellular responses of marine phytoplankton to ENPs are still not well established. Here, we investigate four different diatom species (Odontella mobiliensis, Skeletonema grethae, Phaeodactylum tricornutum, Thalassiosira pseudonana) and one green algae (Dunaliella tertiolecta) for their extracellular polymeric substances (EPS) release under model ENP treatments: 25 nm titanium dioxide (TiO2), 10-20 nm silicon dioxide (SiO2), and 15-30 nm cerium dioxide (CeO2)...
December 13, 2017: Nanoscale Research Letters
Zheng Chang, Yinghao Mi, Xingwang Zheng
In this paper, polyethylenimine (PEI) and Chitosan were simultaneously one-step doped into silicon dioxide (SiO2 ) nanoparticles to synthesize PEI/Chitosan/SiO2 composite nanoparticles. The polymer PEI contained a large amount of amino groups, which can realize the amino functionalized SiO2 nanoparticles. And, the good pore forming effect of Chitosan was introduced into SiO2 nanoparticles, and the resulting composite nanoparticles also had a porous structure. In pH 7.4 phosphate buffer solution (PBS), the amino groups of PEI had positive charges, and therefore the fluorescein sodium dye molecule can be loaded into the channels of PEI/Chitosan/SiO2 composite nanoparticles by electrostatic adsorption...
December 12, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
Pey-Shiuan Wu, Yi-Ching Lee, Yi-Ching Kuo, Chih-Chien Lin
Although octyl methoxy cinnamates (OMC) is the most used Ultraviolet B (UVB) filter in sunscreen, it has poor light stability in emulsion system. In this study, OMC/SiO₂ nanoparticles were prepared via sol-gel emulsion method. Tetraethoxy silane (TEOS) was used as the silica source to encapsulate OMC. Modification of experimental parameters such as stirring speed of condensation reaction and emulsion condition, pH value of acid-catalyzed, surfactant and different percentage of TEOS and OMC, adding of OMC and surfactant to different phase may affect the particle size, and yield and entrapment efficiency in preparation process of OMC/SiO₂ nanoparticles...
December 7, 2017: Nanomaterials
Joong Hyun Kim, HyeungWoo Park, Soo Won Seo
We developed a straightforward method to fabricate antibacterial silicon films via the in situ synthesis of silver nanoparticles (AgNPs) on a polydimethylsiloxane (PDMS) film. To grow AgNPs attached on the film, AgNP seeds were synthesized through the reduction of silver ions electrostatically bound to hydroxyl groups formed on the surface of the film after treatment with air plasma. In the growth reaction, silver ions were reduced on the seeds of AgNPs by sodium citrate in a solution of AgNO3, which allowed for the formation of AgNPs with sizes of up to ~ 500 nm, which The formed AgNPs on the films were characterized using UV-vis spectrophotometer, scattering electron microscope and induced coupled mass spectrometer...
2017: Nano Convergence
Guangxin Lv, Bin Zhu, Xiuqiang Li, Chuanlu Chen, Jinlei Li, Yan Jin, Xiaozhen Hu, Jia Zhu
Silicon nanostructures have served as promising building blocks for various applications, such as lithium ion battery, thermoelectrics and solar energy conversions. Particularly, controls of porosity and doping are critical for fine tuning the mechanical, optical and electrical properties of these silicon nanostructures. However, perforation and doping are usually separated processes, both of which are complicated and expensive. Here, we demonstrate that the porous nano-Si particles with controllable dopant can be massively produced through a facile and scalable method, combining ball milling and acid etching...
December 6, 2017: ACS Applied Materials & Interfaces
Tesfalem Geremariam Welearegay, Umut Cindemir, Lars Österlund, Radu Ionescu
Here we report for the first time the fabrication of ligand functionalised ultrapure monodispersed metal nanoparticles (Au, Cu, and Pt) from their pure metal precursors using the Advanced Gas Deposition technique. The experimental conditions during nanoparticles formation were adjusted in order to obtain ultrafine isolated nanoparticles on different substrates. The morphology and surface analysis of the as-deposited metal nanoparticles were investigated using Scanning Electron Microscopy, X-ray Diffraction and Fourier Transform Infrared Spectroscopy, which demonstrated the formation of highly ordered pure crystalline nanoparticles with a relatively uniform size distribution of ~10 nm (Au), ~ 4 nm (Cu) and ~ 3 nm (Pt), respectively...
December 5, 2017: Nanotechnology
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"