Sol-gel synthesis and densification of aluminoborosilicate powders. by Jeffrey Bull

Cover of: Sol-gel synthesis and densification of aluminoborosilicate powders. | Jeffrey Bull

Published by National Aeronautics and Space Administration, Ames Research Center, For sale by the National Technical Information Service in Moffett Field, Calif, [Springfield, Va .

Written in English

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Subjects:

  • Inorganic compounds -- Synthesis.

Edition Notes

Book details

StatementJeffrey Bull, Guna Selvaduray, Daniel Leiser.
SeriesNASA technical memorandum -- 103969.
ContributionsSelvaduray, Guna S., Leiser, Daniel., Ames Research Center.
The Physical Object
FormatMicroform
Pagination1 v.
ID Numbers
Open LibraryOL15368209M

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Aluminoborosilicate (ABS) powders, high in alumina content, were synthesized by the sol-gel process utilizing four different methods of synthesis. The effect of these methods on the densification. Get this from a library. Sol-gel synthesis and densification of aluminoborosilicate powders.

Part 2, Densification. [Jeffrey Bull; Sol-gel synthesis and densification of aluminoborosilicate powders. book Selvaduray; Daniel Leiser; Ames Research Center.]. SOL-GEL SYNTHESIS AND DENSIFICATION OF ALUMINOBOROSILICATE POWDERS PART II--DENSIFICATION Jeffrey Bull, Guns Selvaduray,* and Daniel Leiser NASA Ames Research Center Summary Aluminoborosilicate(ABS) powders, highinalumina content,were synthesizedby the sol-gelprocessuti-lizingfour di_erentmethods ofsynthesis.

The ef. Online shopping from a great selection at Books Store. Preparation and Novel Characterization Ways of Mesoporous Metal Oxides: sol-gel synthesis of mesoporous metal oxides and their characterization scattering and gas physisorption methods. Sol–gel synthesis of barium titanate powders of various compositions The rate of densification (which considers the green densities, BaTiO and BaTiO can be synthesized by a sol–gel method at low temperatures.

The reaction between barium acetate solutions and titanium() isopropoxide leads to the formation of barium titanate gels. Lithium aluminum silicate (LAS) powders were synthesized through sol–gel technique by using three different sources of silica, i.e., TEOS, fumed silica and rice husk ash and their effects on the characteristics of the powders were wrcch2016.com by: Sol-gel synthesis and characterization of Nb2O5 powders Article in Materials Letters · August with Reads How we measure 'reads'.

Synthesis and characterization of alumina nano-powder obtained by sol-gel method 71 Debye-Scherrer relation was used to calculate cristallite average dimensions of alumina powders obtained by sol-gel process using inorganic and organic precursors (Table 1).

Table 1 Dimensions of α-Al2O3 crystallites calculated with Debye-Scherrer relation. Ultrafine ceria-doped zirconia powders with the general formula Ce x Zr 1−x O 2 oriented for functional ceramic materials for different purposes were prepared by modified sol–gel synthesis with use of monoethanolamine or tetraethylammonium hydroxide.

All powders were high crystallized single-phase systems with average crystallite size 8–11 wrcch2016.com by: Sol-gel and polymer photonic devices / Mark P. Andrews, S. Iraj Najafi, editors; Sol-gel synthesis and densification of aluminoborosilicate powders. Part 1, Sol-gel synthesis and densification of aluminoborosilicate powders.

book [microform] / Jeff Deposition of electrochromic window coatings using sol-gel technology / J.M. Bell, G.B. Smith. Abstract. BaTi 2 O 5 powders were synthesized using a sol–gel method and characterized. Phase evolution and characteristics of the samples were studied using differential scanning calorimetry, thermogravimetric analysis and X-ray wrcch2016.com by: Synthesis of sol-gel derived alumina powder, Effect of milling and calcination temperatures on sintering behaviour Sathiyakumar, M, and all, British ceramic transactions.

98, N° 2, (), 87 Study of the sol-gel processing of glass-ceramic powders in the SiO2-A12O3-CaO-CaF2 system.I. Effect of powder composition on gel time and temperature. Jul 17,  · A novel sol-gel processing was developed to synthesize polycrystalline cerium-doped lutetium pyrosilicate (Lu 2 Si 2 O 7:Ce, LPS:Ce) powders under low wrcch2016.com was found that the addition of propylene oxide (PPO) could promote the formation of Lu-O-Si bonds in precursor, which was beneficial to the formation of LPS wrcch2016.com by: 5.

Sol–gel synthesis and characterization of V 2O 5 powders M. Gotic´a, S. Popovic´b, M. Ivandaa, S. Music´a,* aDivision of Materials Chemistry, Rudjer Bosˇkovic´ Institute, P.O. Box Bijenicka Cesta 54, HR Zagreb, Croatia bFaculty of Sciences, Department of Physics, University of Zagreb, P.O. BoxHR Zagreb, Croatia Received 23 December ; accepted 28 December SearchWorks Catalog Stanford Libraries.

Sol-gel synthesis and densification of aluminoborosilicate powders. Part 1, Synthesis [microform] [] Bull, Jeffrey. Sol-gel synthesis and densification of aluminoborosilicate powders. Part 2, Densification [microform] []. Yttrium silicate (Y 2 SiO 5) powders of high purity have been synthesized using the sol–gel wrcch2016.comde precursors were used with commercial tetraethyl orthosilicate as the silica source and yttrium propoxide synthesized from YCl wrcch2016.coms calcined.

Synthesis of SiO 2 Nanostructures 2 Nanostructures Using Sol-Gel Method catalystandthehydrolyzingagent,respectively. Ethanol FESEM evaluation of powders reveals that the powders consist of fine particle agglomerates, the parti-clesappeartoadheretoeachother,formingaggregateof.

H.N. Azlina et al. Apr 01,  · High purity ZrSiO4 powder were synthesized using Si (C2H5O)4 and ZrOCl2·8H2O as raw materials by the sol-gel method, LiCl was added as mineralizer to promote crystallization of zircon. The influences of molar ratio of Zr:Si, calcined time and calcined temperature on the synthesis of ZrSiO4 powder were investigated.

XRD, SEM and TEM were used to characterize the wrcch2016.com: Zhen Quan Li, Qiang Zhen, Ya Li Wang. The influence of solvent and the rate of addition of water on the characteristics of alumina-zirconia powders obtained by sol-gel method were investigated.

The Al2O3-ZrO2 powders ( molar ratio) were prepared using aluminum tri-sec-butoxide and zirconium n-propoxide as precursors. Ethanol (EtOH), isopropanol (iPrOH) and isobutanol (iBuOH) were used as wrcch2016.com by: 9. Sol-gel technology has been used for investigation the synthesis and structure of gels in the Al 2 O 3-TiO 2-SiO 2-MgO system [22].

Taking into account that the main advantages of sol-gel method can contribute to improve the proper-ties and applications of cordierite/tialite glass-ceramics, this method has been used for their synthesis, as well as. Jul 01,  · CeO2 nano-sized crystalline powders were prepared by sol-gel combustion method from ammonium cerium nitrate and citric acid, and the dependences of the particle size of synthesized powder on the precursor gel were investigated.

The precursor gels and the synthesized powders were characterized by field emission scanning electron microscopy (FE-SEM) and X-ray scattering (XRD).Cited by: 1. New approaches for β-cyclodextrin-containing silicas synthesis were demonstrated. Materials with hexagonally ordered mesoporous structure were prepared by postsynthesis grafting and by co-condensation methods.

β-Cyclodextrin activated by a N,N′-carbonyldiimidazole was employed for postsynthesis treatment of 3-aminopropyl-modified MCM support as well as for sol-gel synthesis Cited by: 7.

Sol-Gel science and technology. The way of making materials in any form including fibers, films, particles and monolithic solids starting with liquids and molecular precursors. Glass, Ceramics and organic-inorganic materials can be processed by Sol- Gel techniques.

SYNTHESIS OF CORDIERITE POWDERS BY WATER-BASED SOL-GEL METHOD respectively. As can be seen in the figure, an amorphous phase was formed at the sintering temperature lower than oC. When the temperature rose to C, µ-cordierite and some Mg-Al spinel appeared.

According to DSC and XRD figures, when the temperature. Synthesis and Characterization of Crystalli ne Zirconium Titanate Obtained by Sol-Gel Actually the sol-gel processes were developed both in academic research and in industry, producing glasses by straightforward polymerization of molecular precursors in solution.

Basically, sol Cited by: 4. 13 October Sol-gel synthesis of cadmium tin oxide powder. Jayachandran; Cadmium tin oxide powder has been synthesized by the sol-gel route using the polyacrylamide gel. Details of the preparation and preliminary characterization of the product are reported.

Gas sensing properties of nanocrystalline metal oxide powders prepared Cited by: 1. Molybdenum oxide (MoO3) thin films were prepared by sol–gel methods at room temperature from the precursors of MoO3 powder mixing into NH3 or H2O2 solution and then directly treated by UV-ozone instead of widely used high-temperature annealing.

Atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), and ultraviolet photoelectron spectroscopy (UPS) characteristics demonstrated. Sol-gel synthesis of ordered mesoporous alumina Krisztian Niesz, Peidong Yang and Gabor A.

Somorjai* Received (in Cambridge, UK) 23rd DecemberAccepted 3rd February First published as an Advance Article on the web 16th February DOI: /bd Well-ordered mesoporous alumina materials with high surface. the synthesis of nanometric ceramic particles in com-mercial quantities.

These include: (i) sol-gel and chemical wet methods for precipita-tion of oxides mainly from salt solutions (ii) flame and spray pyrolysis of both oxide and non-oxide powders, using inorganic solutions (iii) chemical vapour techniques for nanopowder synthesis.

Sol–gel synthesized zinc oxide nanorods and their structural and optical investigation for optoelectronic application Kai Loong Foo, 1 Uda Hashim, 1 Kashif Muhammad, 1 and Chun Hong Voon 1 1 Nano Biochip Research Group, Institute of Nano Electronic Engineering (INEE), Universiti Malaysia Perlis (UniMAP), Kangar, PerlisMalaysiaCited by: the synthesis of powders, porous particulates and mesoporous glasses for scaffold development, bone regeneration, drug delivery, and treatment of hypersensitive teeth, etc.

[9–15]. One important drawback of the sol–gel synthesis over the melt process is that it is very difficult to obtain crack-free glass. 3 Powder Prepared by Sol-Gel Process † Fig. 2 Sample preparation procedures.

Fig. 3 XRD patterns of the sol-gel derived powders of A/C = 90/10, A/C = 70/30 and A/C = 50/50 calcined at °−°C. Solid lines indicate the position of respective () plane in pure Cr 2. SOI-QJ ecnnZUU5 Z/ 62 el SCI.

and 1 7. Cuerda, C. M "Effect of calcination temperature on the textural properties of 3 mol% yttria-stabilized zirconia powders". The most common procedures for preparing the titania powders have been based on the hydrolysis ofacidic solutions ofTi(IV) salts, ,or by gas-phase oxidation reaction of TiCl4 at high temperatures.

Alternative methods like vapour-phasehydrolysis, pyrolysis, and sol-gel synthesis I. dataofsilicapowderssynthesizedwithTMOS,which are plotted as a log-log plot. The measured fractal dimension iswhich follows the diffusion-limited. Mesoporous silica was synthesised by sol–gel mineralisation using nematic liquid crystalline templates consisting of partially ordered suspensions of cellulose rod-like nanocrystals, ca.

× 13 nm in size. The nanorods were prepared by acid hydrolysis of cellulose powder and concentrated droplets evaporateCited by: Jul 20,  · 9.

A method for the solid state synthesis of mixed metal oxide crystalline powders, as set forth in claim 1, wherein said material is a spinel. A method for the solid state synthesis of mixed metal oxide crystalline powders, as set forth in claim 1, wherein said material is a phenacite.

sol-gel methods involve the condensation of silica alkox-ides with β-cyclodextrin [41] or β-cyclodextrin-containing silanes [42–44]. The predominant majority of these works relates to the synthesis of functionalized silica materials with disordered porous structure.

However, usage of aggressive solvents and activating agents in multistep pro-Cited by: 7. Preparation of nano-scale α-Al 2 O3 powder by the sol-gel method Ceramics – Silikáty 55 (4) () net charge of the powder surface which causes a weak dispersion system [9,11].

the sol-gel method, based on molecular precursors, usually utilizes metal alkoxides as raw materials with a good control over the stoichio. SYNTHESIS AND CHARACTERIZATION OF ZEOLITES FROM SODIUM ALUMINOSILICATE SOLUTION by Schematic diagram showing the synthesis route of zeolite via sol gel using the hydrothermal treatment 54 SYNTHESIS AND CHARACTERIZATION OF ZEOLITES FROM SODIUM.

Anatase titanium dioxide nanoparticles (TiO 2 -NPs) were synthesized by sol-gel method using rice straw as a soft biotemplate. Rice straw, as a lignocellulosic waste material, is a biomass feedstock which is globally produced in high rate and could be utilized in an innovative approach to manufacture a value-added product.

Rice straw as a reliable biotemplate has been used in the sol-gel Cited by: THE USE OF BORON-CONTAINING ADDITIVES FOR SYNTHESIS OF ANORTHITE CERAMIC POWDERS Anorthite ceramics have a great potential as a substrate material due to their low thermal expansion coefficient and low dielectric constant.

For lowering the sintering temperature of anorthite ceramics several routes like employing additives, sol-gel.Synthesis of quality silica gel; Optimization of parameters Hafiz Asghar Ali, Arshad Chughtai and Abdul Sattar.

Engineering Research Division, Institute of Chemical Engineering and Technology, University of the Punjab Lahore. ABSTRACT Silica gels were prepared by acidifying the aqueous solution of sodium silicate. In the investigations,Cited by: 2.

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