Hydrolysis Process and Mechanism of Magnesium Aluminate Alkoxides

2012 ◽  
Vol 197 ◽  
pp. 740-744
Author(s):  
Xiu Hui Wang ◽  
Jian Long Yin ◽  
Wei Liu ◽  
Hong Gao ◽  
Jin Long Yang
Keyword(s):  
Particle Size ◽  
Sol Gel ◽  
Butyl Alcohol ◽  
Magnesium Aluminate ◽  
Metal Alkoxides ◽  
Magnesium Aluminate Spinel ◽  
Gel Time ◽  
Hydrolysis Process ◽  
Particle Size Analyzer ◽  
Hydrolysis Temperature

Superfine, high-purity and well-distributed magnesium aluminate spinel powders were fabricated by controlling alkoxides hydrolysis process. Magnesium aluminate alkoxides were prepared by sol-gel with magnesium, aluminum and n-butyl alcohol as starting materials. Magnesium aluminate spinel powders were fabricated by double alkoxides sintering at 1200 °C for 1h. Controlling hydrolyzing process could obtain the optimum gel time and spinel powders were analyzed by OMEC LS-800 type Laser Particle Size Analyzer. Integrated gel time and particle size, the optimum hydrolyzing parameters are obtained for double metal alkoxides: the concentration of the double metal alkoxides is below 0.3 mol/L, hydrolysis temperature is 20 °C, the molar rate of alkoxides and water is 1: 10 and the mechanism of the hydrolysis is investigated. Nicolet Avatar 360 type FTIR spectrometer shows that acetylacetone and alkoxides can form a stable hexatomic ring which restrains hydrolysis reaction and controls particle size.

Effect of segregation on particle size stability and SPS sintering of Li2O-Doped magnesium aluminate spinel

2019 ◽  
Vol 39 (10) ◽  
pp. 3213-3220 ◽  
Author(s):  
L.B. Caliman ◽  
D. Muche ◽  
A. Silva ◽  
C.A. Ospina R. ◽  
I.F. Machado ◽  
...  
Keyword(s):  
Particle Size ◽  
Magnesium Aluminate ◽  
Magnesium Aluminate Spinel ◽  
Size Stability ◽  
Sps Sintering

Facile Synthesis and Characterization of Fe-Co Nanoparticles Supported Silica Rice Husk

2016 ◽  
Vol 709 ◽  
pp. 66-69
Author(s):  
Jeyashelly Andas ◽  
Rahmah Atikah Rosdi ◽  
Nur Izzati Mohd Anuar
Keyword(s):  
Particle Size ◽  
Rice Husk ◽  
Sol Gel ◽  
Average Particle Size ◽  
Average Particle ◽  
Silica Source ◽  
Transmission Electron ◽  
Particle Size Analyzer ◽  
Bimetallic Materials ◽  
Co Nanoparticles

A series of Fe-Co nanoparticles were synthesized via sol-gel route at acidic, neutral and basic condition using rice husk as the silica source. The synthesized nanomaterials were designated as Fe-Co3, Fe-Co7 and Fe-Co9 and characterized by Fourier Transform Infrared (FTIR), Transmission Electron Microscope (TEM) and particle size analyzer. The great effect of pH was clearly evidenced from the shifting in the siloxane bond in the FTIR spectrum. TEM investigation confirmed the existence of discrete and almost sphere like nanoparticles. The particle size decreased with an increase in the pH, registering the smallest average particle size at pH 9. In brief, this study promises a fast, rapid and promising method for the conversion of silica rice husk into nanoscale bimetallic materials.

Templated epitaxial coatings on magnesium aluminate spinel using the sol-gel method

2009 ◽  
Vol 44 (5) ◽  
pp. 1180-1186 ◽  
Author(s):  
David Browne ◽  
Hongwei Li ◽  
Edoardo Giorgi ◽  
Sreya Dutta ◽  
Jeffrey Biser ◽  
...  
Keyword(s):  
Sol Gel ◽  
Magnesium Aluminate ◽  
Magnesium Aluminate Spinel ◽  
Gel Method ◽  
Sol Gel Method

Magnesium-Aluminate Spinel Fibers Obtained by the Sol-Gel Method

2019 ◽  
Vol 76 (7-8) ◽  
pp. 302-306
Author(s):  
Yu. A. Balinova ◽  
G. Yu. Lyulyukina ◽  
S. G. Kolyshev
Keyword(s):  
Sol Gel ◽  
Magnesium Aluminate ◽  
Magnesium Aluminate Spinel ◽  
Gel Method ◽  
Sol Gel Method

scholarly journals Characterization and photocatalytic study of tantalum oxide nanoparticles prepared by the hydrolysis of tantalum oxo-ethoxide Ta8(μ3-O)2(μ-O)8(μ-OEt)6(OEt)14

2014 ◽  
Vol 5 ◽  
pp. 1082-1090 ◽  
Author(s):  
Subia Ambreen ◽  
N D Pandey ◽  
Peter Mayer ◽  
Ashutosh Pandey
Keyword(s):  
Particle Size ◽  
Sol Gel ◽  
Tantalum Oxide ◽  
Organic Dye ◽  
Oxide Nanoparticles ◽  
Tauc Plot ◽  
Particle Size Analyzer ◽  
Bet Method ◽  
Hydrolysis Of ◽  
Controlled Hydrolysis

Ta8(μ3-O)2(μ-O)8(μ-OEt)6(OEt)14 (1) was obtained by the controlled hydrolysis of tantalum ethoxide Ta(OEt)5 in the presence of ammonia. Compound 1 is considered as the intermediate building block in the sol–gel polymerization of Ta(OEt)5. Further hydrolysis of compound 1 yielded nanoparticles of Ta2O5, which were characterized by various techniques such as TGA-DTA-DSC, UV–vis DRS, XRD, SEM, TEM, particle size analyzer (DLS) and the Brunauer–Emmett–Teller (BET) method. The band gap of the particles was calculated by using the Tauc plot. The photocatalytic activity of Ta2O5 nanoparticles was tested by the degradation of the organic dye rhodamine B.

Particle Size Distribution of Cerate-Zirconate Powder Prepared via Three Different Methods

2015 ◽  
Vol 1108 ◽  
pp. 67-72 ◽  
Author(s):  
Najwa Adni Ibarahim ◽  
Nafisah Osman ◽  
Mohd Azlan Mohd Ishak
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Supercritical Fluids ◽  
Particle Distribution ◽  
Sol Gel ◽  
Spherical Shape ◽  
Particle Size Analyzer ◽  
Powder Density ◽  
Sem Micrograph

Ceramics powder of BaCe0.54Zr0.36Y0.1O2.95 (BCZY) was synthesized using three different methods namely sol-gel (SG), supercritical fluid (SC) and sol-gel assisted supercritical fluids (SGSF).The respective prepared samples were denoted as S1, S2 and S3. The calcined powder (T= 1100 °C) was analyzed using particle size analyzer (PSA), Pcynometer and scanning electron microscope (SEM). PSA showed a single particle size distribution (PSD) for all samples except for S3 which exhibits bimodial particle distribution. PSD of the samples were in the range of 295-396 nm for the primary powder and 712-820 nm for secondary powder. High relative powder density for S1, S2, S3 were recorded at 95 %, 93 % and 99 %, respectively. Morphology of the calcined powders by SEM micrograph revealed that S1 is in spherical shape, S2 is in cubic structure and S3 showed a mixture of spherical and rod-like structure. It was found that SG and SC produce a single shape of powder with lower density compared with SGSF.

scholarly journals Electric polarization properties of BaTiO3-BiFeO3 as nanomultiferroic material produced by sol-gel method

2018 ◽  
Vol 204 ◽  
pp. 05005 ◽  
Author(s):  
Dwita Suastiyanti ◽  
Maykel T.E. Manawan ◽  
Marlin Wijaya
Keyword(s):  
Particle Size ◽  
Sol Gel ◽  
Sinter Time ◽  
Weight Ratio ◽  
Electric Polarization ◽  
X Ray Diffraction ◽  
Gel Method ◽  
Sol Gel Method ◽  
Particle Size Analyzer ◽  
Dominant Phase

The nanomultiferroic material which is synthesized in this research used sol-gel method. The research used weight ratio of BaTiO3: BiFeO3 of 2: 1. Gel formed after heating at 80-90°C was calcined at 350°C for 4 hours and then sintered at 700,750 and 800°C for 2, 4 and 6 hours respectively. Powder produced after sintering was characterized by X-Ray Diffraction (XRD) test using XRD Phillips PW 1835 type, 20°-100° diffraction angle and CuKα, electric polarization properties test and particle size measurement using Particle Size Analyzer of Beckman Coulter DelsaTM Nano instrument. From the characterization results, it is obtained that the dominant phase is Barium Bismuth Iron (III) Oxide (BaBiFe2O5). Electrical polarization properties such as remanent, coersivity and saturation reach maximum value at sinter temperature of 750° C and sinter time of 6 hours. This result is supported by the smallest particle size of powder (54-57 nm) and also supported by the largest number of dominant phase (98.79%) at same condition.

Synthesis of magnesium aluminate spinel nanopowder by sol–gel and low-temperature processing

2017 ◽  
Vol 85 (1) ◽  
pp. 110-120 ◽  
Author(s):  
L. Zarazúa-Villalobos ◽  
L. Téllez-Jurado ◽  
N. Vargas-Becerril ◽  
G. Fantozzi ◽  
H. Balmori-Ramírez
Keyword(s):  
Low Temperature ◽  
Sol Gel ◽  
Magnesium Aluminate ◽  
Magnesium Aluminate Spinel ◽  
Low Temperature Processing

Preparation and Stability Characterization of Copper Oxide Nanofluid by Two Step Method

2015 ◽  
Vol 832 ◽  
pp. 139-143 ◽  
Author(s):  
A.L. Subramaniyan ◽  
Arun Kumar ◽  
Sethupathi ◽  
T. Sorna Kumar ◽  
R. Ilangovan
Keyword(s):  
Particle Size ◽  
Copper Oxide ◽  
Copper Chloride ◽  
Sol Gel ◽  
Cuo Nanoparticles ◽  
Step Method ◽  
Sem Image ◽  
Particle Size Analyzer ◽  
Negative Zeta Potential

Copper oxide (CuO) nanofluids are prepared by two step method. CuO nanoparticles are prepared by sol gel method with Copper chloride as precursor and NaOH as a reducing agent. The prepared CuO nanoparticles are characterized by XRD, SEM and Particle size analyzer. XRD measurements reveal a grain size of 72nm .SEM image reveals an inhomogenous mixture of particles from 500 nm to 3500 nm with irregular morphology and few traces of CuO cones.. The particle size distribution of CuO particles is in the range of 1000-1600nm which is in accordance with the SEM results.CuO –Ethylene Glycol nanofluids are prepared by two step method by ultrasonication of obtained CuO particles.The stability of CuO nanofluid is given with a negative zeta potential of-22.5 mv.

Sign in / Sign up

Export Citation Format

Share Document