Ultra-long SiC nanowires synthesized by a simple method

RSC Advances ◽  
2015 ◽  
Vol 5 (81) ◽  
pp. 66403-66408 ◽  
Author(s):  
Ping Hu ◽  
Shun Dong ◽  
Kaixuan Gui ◽  
Xianzhu Deng ◽  
Xinghong Zhang
Keyword(s):  
Simple Method ◽  
Sic Nanowires ◽  
Vs Mechanism

Ultra-long SiC nanowires synthesized by alumina-assisted growth of the vapor–solid (VS) mechanism.

Synthesis of SiC Nanowires with Silica Sol and Carbon Black

2011 ◽  
Vol 287-290 ◽  
pp. 449-452
Author(s):  
Yi Wei ◽  
Fu Wang ◽  
Wen Bin Cao
Keyword(s):  
Carbon Black ◽  
Carbothermal Reduction ◽  
Graphite Crucible ◽  
Silica Sol ◽  
Sic Nanowires ◽  
Graphite Plate ◽  
Vs Mechanism ◽  
Acetylene Carbon ◽  
Acetylene Carbon Black ◽  
Sic Particle

Nanometer-sized β-SiC were synthesized by carbothermal reduction of silica sol with acetylene carbon black at 1600 °C for 2h. Three kinds (straight, bamboo-like, branch-like) of SiC nanowires were deposited on the graphite plate, while SiC particle agglomerates and nanowires were formed in the graphite crucible. All the nanowires were formed via VS mechanism through the reaction between gaseous SiO and CO produced from the process of carbothermal reduction.

SILICON CARBIDE NANOWIRES FROM POLYVINYL ALCOHOL/SILICA ELECTROSPUN NANOFIBERS

NANO ◽  
2011 ◽  
Vol 06 (01) ◽  
pp. 41-45 ◽  
Author(s):  
H. DELAVARI H. ◽  
M. KOKABI
Keyword(s):  
Electron Microscopy ◽  
Silicon Carbide ◽  
Polyvinyl Alcohol ◽  
Gas Flow ◽  
Electrospun Nanofibers ◽  
Average Diameter ◽  
Sic Nanowires ◽  
Transmission Electron ◽  
Temperature Scanning ◽  
Vs Mechanism

The catalyst-free synthesis of silicon carbide (SiC) nanowires was carried out from polyvinyl alcohol (PVA)/silica electrospun nanofibers at high temperature. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray powder diffraction (XRD), and thermogravimetery analysis (TGA) were employed to study morphology and formation of SiC nanowires. Based on the TGA analysis, the carbon yield was increased when inert gas flow rate and heating rate decreased and polymeric nanofibers has been stabilized. The XRD and TEM results showed that the produced nanowires were crystalline β- SiC and rather homogeneous in thickness with an average diameter around 50 to 70 nm and a length of more than 10 μm. Finally, a possible growth mechanism of β- SiC nanowire based on a vapor–solid (VS) mechanism was proposed.

The preparation of SiC nanowires reinforced porous carbon nanocomposites by a simple method

2018 ◽  
Vol 219 ◽  
pp. 258-262 ◽  
Author(s):  
Hongmei Chen ◽  
Sien Liao ◽  
Xuan Lu ◽  
Nannan Wang ◽  
Zhuxian Yang ◽  
...  
Keyword(s):  
Porous Carbon ◽  
Simple Method ◽  
Carbon Nanocomposites ◽  
Sic Nanowires

scholarly journals In-Situ Fabrication of ZrB2-ZrC-SiCnws Hybrid Nanopowders With Tunable Morphologies of SiCnws

2021 ◽  
Author(s):  
Changqing Liu ◽  
Xiaoxiao Yuan ◽  
Wanting Wang ◽  
Hulin Liu ◽  
Chengxin Li ◽  
...  
Keyword(s):  
Ceramic Materials ◽  
In Situ Synthesis ◽  
Strengthening Effect ◽  
Preparation Process ◽  
Ceramic Powders ◽  
Simple Method ◽  
Sic Nanowires ◽  
In Situ Fabrication ◽  
Local Supersaturation

Abstract SiC nanowires (SiCnws) with different morphologies have great potential for the reinforcement of ceramic materials. But it is a big challenge in the in-situ synthesis of SiCnws in the ceramic powders which is critical to ensure high reinforcing effects. For the reinforcement of ZrB2-ZrC composites, a simple method is developed to in-situ fabricate SiCnws with various morphologies in nano-sized ZrB2-ZrC powders through pyrolyzing ZrB2-ZrC-SiC gel precursors. The prepared ZrB2-ZrC ceramic powders have mean diameter of about 100 nm with uniformly distributed SiCnw in morphologies of nanocylider, bead-like, bamboo-shape with tunable nodes, chain-like and hexagonal prisms were prepared by optimizing the preparation process. Moreover, the SiCnws were in a diameter of ranging from 100 to 400 nm, while the length was controlled from tens to hundreds of microns. The generation of ZrB2/ZrC can determine the formation of SiCnws with specific morphologies by producing CO gas to affect the local supersaturation of the SiO and CO vapors. The study provides an opportunity for fabricating SiCnw reinforced ceramic materials with enhanced strengthening effect and also overcome its critical fabrication process.

A simple way for producing holographic filters suitable for image improvement

1978 ◽  
Vol 36 (1) ◽  
pp. 226-227
Author(s):  
K.-H. Herrmann ◽  
E. Reuber ◽  
P. Schiske
Keyword(s):  
Transfer Functions ◽  
Diffraction Order ◽  
Lateral Position ◽  
Simple Method ◽  
Spatial Frequencies ◽  
Resolution Electron ◽  
Wiener Filters ◽  
Image Improvement ◽  
Optical Reconstruction ◽  
Set Up

Aposteriori deblurring of high resolution electron micrographs of weak phase objects can be performed by holographic filters [1,2] which are arranged in the Fourier domain of a light-optical reconstruction set-up. According to the diffraction efficiency and the lateral position of the grating structure, the filters permit adjustment of the amplitudes and phases of the spatial frequencies in the image which is obtained in the first diffraction order.In the case of bright field imaging with axial illumination, the Contrast Transfer Functions (CTF) are oscillating, but real. For different imageforming conditions and several signal-to-noise ratios an extensive set of Wiener-filters should be available. A simple method of producing such filters by only photographic and mechanical means will be described here.A transparent master grating with 6.25 lines/mm and 160 mm diameter was produced by a high precision computer plotter. It is photographed through a rotating mask, plotted by a standard plotter.

Rotary Beveling for In Situ Thin-Section Microscopy of Cell Cultures

1981 ◽  
Vol 39 ◽  
pp. 550-551
Author(s):  
Dean A. Handley ◽  
Jack T. Alexander ◽  
Shu Chien
Keyword(s):  
Cell Growth ◽  
Cell Cultures ◽  
Molecular Interactions ◽  
Convenient Method ◽  
Petri Dish ◽  
Simple Method ◽  
Thin Section Microscopy ◽  
Thin Sectioning ◽  
Organic Fluids

In situ preparation of cell cultures for ultrastructural investigations is a convenient method by which fixation, dehydration and embedment are carried out in the culture petri dish. The in situ method offers the advantage of preserving the native orientation of cell-cell interactions, junctional regions and overlapping configurations. In order to section after embedment, the petri dish is usually separated from the polymerized resin by either differential cryo-contraction or solvation in organic fluids. The remaining resin block must be re-embedded before sectioning. Although removal of the petri dish may not disrupt the native cellular geometry, it does sacrifice what is now recognized as an important characteristic of cell growth: cell-substratum molecular interactions. To preserve the topographic cell-substratum relationship, we developed a simple method of tapered rotary beveling to reduce the petri dish thickness to a dimension suitable for direct thin sectioning.

Development of a simple method for the determination of single nucleotide polymorphisms

2010 ◽  
Vol 34 (8) ◽  
pp. S75-S75
Author(s):  
Weifeng Zhu ◽  
Zhuoqi Liu ◽  
Daya Luo ◽  
Xinyao Wu ◽  
Fusheng Wan
Keyword(s):  
Single Nucleotide Polymorphisms ◽  
Nucleotide Polymorphisms ◽  
Simple Method ◽  
Single Nucleotide
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