Synthesis and Characterization of Nanocrystalline Anatase by Microwave Hydrothermal Method

2012 ◽  
Vol 500 ◽  
pp. 104-107
Author(s):  
Zhi Qin Chen ◽  
Xiang Liang Chen ◽  
Shu Juan Zhang ◽  
Jun Xi Hu ◽  
Wen Kui Li
Keyword(s):  
Hydrothermal Method ◽  
Average Particle Size ◽  
Butyl Alcohol ◽  
Molar Ratio ◽  
Tetrabutyl Titanate ◽  
Average Particle ◽  
Synthesis Conditions ◽  
Microwave Hydrothermal ◽  
Microwave Hydrothermal Method

Uniform nanocrystalline pure anatase has been synthesized and characterized using tetrabutyl titanate aqueous solution as starting precursors by microwave hydrothermal method. The influences of synthesis conditions (reaction time and temperature) on the formation, crystal phase and crystallite size of TiO2has been investigated. A mixture solution of tetrabutyl titanate and normal butyl alcohol in 1:4 molar ratio is processed in a microwave hydrothermal autoclave at low temperature 120°C for different durations, at 200°C for 20 min to precipitate titania powders, respectively. It was revealed that uniformly dispersed and granulous single phase anatase prepared at 120°C for 180 min with the average particle size of 10 nm was formed by means of XRD and TEM.

Study on Hydrothermal Synthesis of Flower-Sphere MoS2

2011 ◽  
Vol 311-313 ◽  
pp. 566-570
Author(s):  
Jun Zhou ◽  
Xin Zhe Lan ◽  
Ping Ren ◽  
Lei Wu
Keyword(s):  
Reaction Time ◽  
Aging Time ◽  
Self Assembly ◽  
Average Particle Size ◽  
Molar Ratio ◽  
Average Particle ◽  
X Ray Diffraction ◽  
X Ray ◽  
Synthesis Conditions ◽  
Effective Technology

An effective technology of hydrothermal synthesizing flower-sphere MoS2 by reaction of Na2MoO4 and CS(NH2)2 with NH2OH•HCl as reductant was researched. The effect of the molar ratio of Mo to S, reaction temperature, reaction time, aging time on the yield, purity and morphology of the product was explored by means of X-ray diffraction (XRD) and scanning electron microscope (SEM). The results show that the optimal synthesis conditions are as follows: the molar ratio of Mo to S of 1:7, the temperature of 220°C, the reaction time of 24h and the aging time of 16h. Under these conditions, the inerratic and pure flower-sphere MoS2 was obtained. Its average particle size is about 2μm and the petal is self-assembly growth. The yield of the product can reach 88%.

SYNTHESIS AND CHARACTERIZATION OF n-BUTYL 4-(3,4-DIMETHOXYPHENYL)-6-METHYL-2-THIOXO-1,2,3,4 TETRAHYDROPYRIMIDINE-5-CARBOXYLATE NANOCRYSTALLINE PARTICLES BY WATER/OIL MICROEMULSION METHOD

2011 ◽  
Vol 10 (06) ◽  
pp. 1237-1244 ◽  
Author(s):  
POORVESH M. VYAS ◽  
MIHIR J. JOSHI ◽  
AKSHAY M. PANSURIYA ◽  
YOGESH T. NALIAPARA
Keyword(s):  
Average Particle Size ◽  
Butyl Alcohol ◽  
Average Particle ◽  
Dielectric Study ◽  
Xrd Pattern ◽  
Transmission Electron ◽  
Nanocrystalline Particles ◽  
Ft Ir ◽  
Biginelli Condensation

Various pyrimidine derivatives are well known for their different pharmaceutical applications. The n-butyl 4-(3, 4-dimethoxyphenyl)-6-methyl-2-thioxo-1,2,3,4 tetrahydropyrimidine-5-carboxylate (n-butyl THPM) was synthesized by using n-butylacetoacetate. The n-butyl acetoacetate was obtained by transesterification of ethyl acetoacetate with n-butyl alcohol using Biginelli condensation. The synthesized powder was used to obtain the nanoparticles of n-butyl THPM by using water/oil microemulsion technique. The average particle size was calculated from the powder XRD pattern by applying Scherrer's formula. The nanoparticles of n-butyl THPM were observed by Transmission Electron Microscope (TEM). The diameter of the nanoparticles varied from 15 nm to 65 nm. The nanoparticles were also characterized by FT–IR spectroscopy, TG–DTA–DSC and mass spectroscopy. The n-butyl THPM nanoparticles were stable up to 280°C. Thermodynamic and kinetic parameters of decomposition were obtained by applying Coats and Redfern relation to the thermogram. The dielectric study was carried out in the frequency range of 50 Hz to 5 MHz. The dielectric constant, dielectric loss and ac conductivity decreased as the frequency of applied field increased.

Microwave Hydrothermal Synthesis of Nanosize TiO2

2008 ◽  
Vol 368-372 ◽  
pp. 1461-1462
Author(s):  
Ze Hua Zhou ◽  
Wen Kui Li ◽  
Zhi Qin Chen
Keyword(s):  
Butyl Alcohol ◽  
Molar Ratio ◽  
Tetrabutyl Titanate ◽  
Microwave Hydrothermal ◽  
Heat Treated ◽  
Nanocrystalline Titanium ◽  
Nanocrystalline Titanium Dioxide ◽  
20 Nm ◽  
Nanosized Tio2 ◽  
Hydrothermal Methods

Nanocrystalline titanium dioxide was synthesized by microwave hydrothermal (MH) using tetrabutyl titanate and normal butyl alcohol as start materials. The mixture solution of tetrabutyl titanate and normal butyl alcohol in 1:1.5 molar ratio was processed in a microwave hydrothermal digestion system at 200oC for 20 min to prepare nanosized TiO2 powders. The results showed that the microwave assisted reactions proceed at a faster rate than the traditional hydrothermal methods. The powder was heat treated at 500oC and the final products is ~20 nm in size and well dispersed.

scholarly journals ALKALIZING AGENT INFLUENCE ON THE CeO2 CATALYST SYNTHESIS AND PROPERTIES

2016 ◽  
Vol 13 (25) ◽  
pp. 23-29
Author(s):  
Matheus José Cunha DE OLIVEIRA ◽  
Max Rocha QUIRINO ◽  
Magna Silmara Oliveira DE ARAÚJO ◽  
Oscar Borges MELO ◽  
Lucianna GAMA
Keyword(s):  
Fuel Cells ◽  
Hydrothermal Method ◽  
Surface Area ◽  
Pore Volume ◽  
Oxygen Sensors ◽  
Catalyst Synthesis ◽  
Synthesis Conditions ◽  
Uv Absorber ◽  
Microwave Hydrothermal ◽  
Microwave Hydrothermal Method

Cerium oxide is an important catalyst used in several reactions as electrolytes in fuel cells, UV absorber and oxygen sensors. The objective of the present work is CeO2 catalyst synthesis by microwave hydrothermal method and then evaluate the influence of NaOH, NH4OH and urea as alkalizing agents in the catalyst properties. The results showed that it was possible to obtain the monophasic catalyst only when using NaOH and NH4OH as precursors; the first presenting greater surface area (141.09 m2.g-1) and higher pore volume. It was concluded that using urea as alkalizing agent synthesis conditions were not sufficient for monophasic cerium production.

Preparation and characterization of ceria nanospheres by microwave-hydrothermal method

2008 ◽  
Vol 62 (30) ◽  
pp. 4509-4511 ◽  
Author(s):  
M.L. Dos Santos ◽  
R.C. Lima ◽  
C.S. Riccardi ◽  
R.L. Tranquilin ◽  
P.R. Bueno ◽  
...  
Keyword(s):  
Hydrothermal Method ◽  
Microwave Hydrothermal ◽  
Microwave Hydrothermal Method

Microstructure Characterization of Ag Nanoparticles Prepared by Hydrothermal Method

2012 ◽  
Vol 476-478 ◽  
pp. 1138-1141
Author(s):  
Zhi Qiang Wei ◽  
Qiang Wei ◽  
Li Gang Liu ◽  
Hua Yang ◽  
Xiao Juan Wu
Keyword(s):  
Crystal Structure ◽  
Particle Size ◽  
Hydrothermal Method ◽  
Ag Nanoparticles ◽  
Average Particle Size ◽  
Average Particle ◽  
Face Centered Cubic ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
Face Centered

Ag nanoparticles were successfully synthesized by hydrothermal method under the polyol system combined with traces of sodium chloride, Silver nitrate(AgNO3) and polyvinylpyrrolidone (PVP) acted as the silver source and dispersant respectively. The samples by this process were characterized via X-ray powder diffraction (XRD), Brunauer–Emmett–Teller (BET) adsorption equation, transmission electron microscopy (TEM) and the corresponding selected area electron diffraction (SAED) to determine the chemical composition, particle size, crystal structure and morphology. The experiment results indicate that the crystal structure of the samples is face centered cubic (FCC) structure as same as the bulk materials, The specific surface area is 24 m2/g, the particle size distribution ranging from10 to 50 nm, with an average particle size about 26 nm obtained by TEM and confirmed by XRD and BET results.

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