scholarly journals Centimetric-Sized Chromium (III) Oxide Object Synthesized by Means of the Carbon Template Replication

Ceramics ◽  
2020 ◽  
Vol 3 (1) ◽  
pp. 92-100
Author(s):  
Pierre GIBOT
Keyword(s):  
Material Surface ◽  
Efficient Synthesis ◽  
X Ray Diffraction ◽  
Replica Technique ◽  
X Ray ◽  
Ceramic Oxide ◽  
Carbon Template ◽  
Synthesis Approach ◽  
Scanning Electron ◽  
Salt Coating

A simple, efficient synthesis approach for designing large ceramic pieces, herein termed chromium (III) oxide (Cr2O3) material, is provided. The process can be called the replica technique, or replication. The elaboration of a material with a unique morphology is a result of a ceramic salt coating that has been previously dissolved in ethylene glycol as the solvent; this process is performed on a carbon material surface that is selected as a template. Here, the carbon template was carbon fiber. After a heat treatment to convert the ceramic precursor to the corresponding ceramic oxide followed by the removal of the template, hollow ceramic oxide wires were obtained. The resulting material was characterized by X-ray diffraction, Raman and Fourier transform infrared spectroscopies, and scanning electron microscopy. The material exhibited a multiscale architecture, assembling nanosized nodules to form micron-sized tubes that assemble themselves into a centimetric structure. Objects with such tailored architectures can be used in a large variety of applications in fields as diverse as pyrotechnics, adsorption, and catalysis.

Biomorphic SiC Prepared from Carbonized Millet by Sol-Gel and Carbothermal Reduction Processing

2010 ◽  
Vol 152-153 ◽  
pp. 1683-1686
Author(s):  
Qing Wang ◽  
Ya Hui Zhang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Silicon Carbide ◽  
Phase Composition ◽  
Carbothermal Reduction ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
X Ray ◽  
Carbon Template ◽  
Scanning Electron

Biomorphic silicon carbide (bioSiC) was prepared by high temperature pyrolysis and sol-gel and carbothermal reduction processing at 1600 oC. The morphology and microstructure of carbon-silica composites and purified bioSiC samples were characterized by scanning electron microscopy. The phase composition of the resulting sample was analyzed by X-ray diffraction. The results suggest that the bioSiC mainly consists of cubic ß-SiC, and principally replicates the shape and microstructure of the carbon template.

Biomorphic TiO2 Ceramics Prepared from Cotton Stalk

2012 ◽  
Vol 602-604 ◽  
pp. 526-529
Author(s):  
Qing Wang ◽  
Lin Zhang ◽  
Ya Hui Zhang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Phase Composition ◽  
High Temperature ◽  
Sol Gel ◽  
Cotton Stalk ◽  
X Ray Diffraction ◽  
X Ray ◽  
Carbon Template ◽  
Scanning Electron

Biomorphic TiO2 was prepared by high temperature pyrolysis and a modified sol-gel route. The morphology and microstructure of TiO2 samples were characterized by scanning electron microscopy. The phase composition of the resulting sample was analyzed by X-ray diffraction. The results suggest that the biomorphic TiO2 mainly consists of rutile TiO2, and replicates the shape and part microstructure of the carbon template.

Preparation of Biomorphic SiC by Reactive Infiltration of Gaseous Si into Carbonized Millet

2010 ◽  
Vol 152-153 ◽  
pp. 1673-1676
Author(s):  
Qing Wang ◽  
Ya Hui Zhang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Silicon Carbide ◽  
Phase Composition ◽  
Pyrolysis Process ◽  
X Ray Diffraction ◽  
X Ray ◽  
Reactive Infiltration ◽  
Carbon Template ◽  
Scanning Electron

Biomorphic silicon carbide (bioSiC) was prepared at 1800 oC by reactive infiltration of gaseous silicon into a carbon template derived from millet. The pyrolysis process of millet was measured by thermogravimetric analysis. The morphology and microstructures of carbon template and purified bioSiC samples were characterized by scanning electron microscopy. The phase composition of bioSiC was analyzed by X-ray diffraction. The results suggest that the bioSiC consists of major cubic ß-SiC and a few α-SiC, and principally replicates the shape and microstructure of the carbon template.

Obtaining of Nanoapatite in Ti-7.5Mo Surface after Nanotube Growth

2012 ◽  
Vol 727-728 ◽  
pp. 1199-1204 ◽  
Author(s):  
A.L.A. Escada ◽  
João Paulo Barros Machado ◽  
Roberto Zenhei Nakazato ◽  
Ana Paula Rosifini Alves Claro
Keyword(s):  
Thin Film ◽  
Biomedical Applications ◽  
Melting Furnace ◽  
Material Surface ◽  
X Ray Diffraction ◽  
X Ray ◽  
Arc Melting ◽  
Cold Worked ◽  
Nanotube Growth ◽  
Scanning Electron

Titanium and their alloys have been used for biomedical applications due their excellent mechanical properties, corrosion resistance and biocompatibility. However, they are considered bioinerts materials because when they are inserted into the human body they are cannot form a chemical bond with bone. In several studies, the authors have attempted to modify their characteristic with treatments that changes the material surface. The purpose of this work was to evaluate obtaining of nanoapatite after growing of the nanotubes in surface of Ti-7.5Mo alloy. Alloy was obtained from c.p. titanium and molibdenium by using an arc-melting furnace. Ingots were submitted to heat treatment and they were cold worked by swaging. Nanotubes were processed using anodic oxidation of alloy in electrolyte solution. Surfaces were investigated using scanning electron microscope (SEM), FEG-SEM and thin-film x-ray diffraction. The results indicate that nanoapatite coating could form on surface of Ti-7.5Mo experimental alloy after nanotubes growth.

scholarly journals Microwave Assisted Expeditious and Green Cu(II)-Clay Catalyzed Domino One-Pot Three Component Synthesis of 2H-indazoles

2018 ◽  
Vol 13 (1) ◽  
pp. 82
Author(s):  
Bashir Ahmad Dar ◽  
Syed Wasim Safvi ◽  
Masood Ahmad Rizvi
Keyword(s):  
Reaction Engineering ◽  
Primary Amines ◽  
Efficient Synthesis ◽  
X Ray Diffraction ◽  
Title Reaction ◽  
One Pot ◽  
X Ray ◽  
Microwave Assisted ◽  
Clay Catalyst ◽  
Scanning Electron

A simple and efficient synthesis of 2H-indazoles is achieved from 2-primary amines, bromobenzaldehydes and sodium azide through domino condensation, C–N and N–N bond formations, catalyzed by a heterogeneous Cu(II)-Clay catalyst. The recyclable heterogeneous Cu(II)-Clay catalyst exhibited a remarkable activity for the title reaction without any additives. An assortment of structurally diverse 2H-indazoles were prepared in good to excellent yields from easily available starting materials by using this protocol. The Cu(II)-Clay catalyst was characterized by using X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), and Brunauer-Emmett-Teller (BET) techniques.  Copyright © 2018 BCREC Group. All rights reservedReceived: 24th February 2017; Revised: 8th August 2017; Accepted: 23rd August 2017; Available online: 22nd January 2018; Published regularly: 2nd April 2018How to Cite: Dar, B.A., Safvi, S.W., Rizvi, M.A. (2018). Microwave Assisted Expeditious and Green Cu(II)-Clay Catalyzed Domino One-Pot Three Component Synthesis of 2H-indazoles. Bulletin of Chemical Reaction Engineering & Catalysis, 13 (1): 82-88 (doi:10.9767/bcrec.13.1.963.82-88) 

scholarly journals Continuous-Flow Synthesis of Perovskite Particles for Optical Application

2021 ◽  
Vol 2015 (1) ◽  
pp. 012072
Author(s):  
Irina Koryakina ◽  
S Bikmetova ◽  
K Arabuli ◽  
A Evstrapov ◽  
A Pushkarev ◽  
...  
Keyword(s):  
Continuous Flow ◽  
Physicochemical Parameters ◽  
Synthesis Methods ◽  
X Ray Diffraction ◽  
Controllable Synthesis ◽  
X Ray ◽  
Scaling Down ◽  
Synthesis Approach ◽  
Scanning Electron

Abstract Conventional chemical synthesis methods for nanomaterials fabrication do not always provide precise reproducible synthesis with controllable physicochemical parameters. A better control over the resultant properties of nanomaterials can be achieved by scaling down the synthesis approach to the microlevel. This can be realized by means of microfluidics. In this work, a microfluidic approach is applied for the controllable synthesis of perovskite particles with defined cubic morphology. The structural characterization of perovskite particles is performed using scanning electron microscopy and X-ray diffraction. All the synthesized particles demonstrate photoluminescence.

scholarly journals Synthesis of biomorphic Si-based ceramics

2009 ◽  
Vol 3 (4) ◽  
pp. 197-201
Author(s):  
Adela Egelja ◽  
Aleksandar Devecerski ◽  
Jelena Gulicovski ◽  
Milena Rosic ◽  
Biljana Babic ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Mercury Porosimetry ◽  
X Ray Diffraction ◽  
X Ray ◽  
Carbon Preform ◽  
Carbon Template ◽  
Cellular Wall ◽  
Biomorphic Ceramics ◽  
Scanning Electron

Tilia wood was transformed by pyrolysis into carbon preform. This porous carbon preform was infiltrated with TEOS (Si(OC2H5)4), as a source of silica. In situ reaction between the silica and the carbon template occurred in the cellular wall at a hight temperature. Depending on the applied atmosphere, non-oxide (SiC) or oxide (SiO2) ceramics were obtained. Scanning electron microscopy (SEM), X-ray diffraction (XRD), infrared (IR) spectroscopy, mercury porosimetry and BET measurements were employed to characterize the phases and crystal structure of biomorphic ceramics. The experimental results showed that the biomorphic cellular morphology of the wood maintained in both the SiC and SiO2 ceramics, wich consisted of ?-SiC with trace of ?-SiC and SiO2, respectively. .

Preparation and Properties Study of Porous Carbon Template Based on SLA

2011 ◽  
Vol 474-476 ◽  
pp. 320-324
Author(s):  
Jie Jin ◽  
Hao Li ◽  
Shen Hao Wang
Keyword(s):  
Electron Microscope ◽  
Porous Carbon ◽  
Phenolic Resin ◽  
Wood Flour ◽  
Three Dimensional ◽  
X Ray Diffraction ◽  
Pore System ◽  
X Ray ◽  
Carbon Template ◽  
Scanning Electron

Prototypes with micro-pore structure were manufactured by stereolithography technology. The prototypes were injected with mixture of wood flour as porogen and thermosetting phenolic resin as raw, then were pyrolysed after curing and prepared porous carbon templates. X-ray diffraction and scanning electron microscope were employed to analyze the phase and microstructures of the carbon templates. The pyrolysis reaction is analyzed, and the causes of the three-dimensional pore system in porous carbon template are given.

The Use of Advanced Analytical Techniques for Characterization of the Chemical, Physical, and Crystallographic Nature of a Surface

1973 ◽  
Vol 31 ◽  
pp. 132-133 ◽  
Author(s):  
R. E. Herfert
Keyword(s):  
Surface Characterization ◽  
Analytical Techniques ◽  
X Ray Diffraction ◽  
Depth Of Penetration ◽  
X Ray ◽  
The Past ◽  
Transmission Electron ◽  
Scanning Electron

Studies of the nature of a surface, either metallic or nonmetallic, in the past, have been limited to the instrumentation available for these measurements. In the past, optical microscopy, replica transmission electron microscopy, electron or X-ray diffraction and optical or X-ray spectroscopy have provided the means of surface characterization. Actually, some of these techniques are not purely surface; the depth of penetration may be a few thousands of an inch. Within the last five years, instrumentation has been made available which now makes it practical for use to study the outer few 100A of layers and characterize it completely from a chemical, physical, and crystallographic standpoint. The scanning electron microscope (SEM) provides a means of viewing the surface of a material in situ to magnifications as high as 250,000X.

Identification of calcium oxalate crystals in dried or fixed tobacco leaf

1984 ◽  
Vol 42 ◽  
pp. 288-289
Author(s):  
Vicki L. Baliga ◽  
Mary Ellen Counts
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Calcium Oxalate ◽  
Growth And Development ◽  
Polarized Light ◽  
Calcium Oxalate Crystals ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Scanning Electron

Calcium is an important element in the growth and development of plants and one form of calcium is calcium oxalate. Calcium oxalate has been found in leaf seed, stem material plant tissue culture, fungi and lichen using one or more of the following methods—polarized light microscopy (PLM), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and x-ray diffraction.Two methods are presented here for qualitatively estimating calcium oxalate in dried or fixed tobacco (Nicotiana) leaf from different stalk positions using PLM. SEM, coupled with energy dispersive x-ray spectrometry (EDS), and powder x-ray diffraction were used to verify that the crystals observed in the dried leaf with PLM were calcium oxalate.

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