scholarly journals Low Temperature Synthesis of Hexagonal Shapedα-Al2O3Using a Solvothermal Method

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
A-Young Kim ◽  
Hyun Soo Kim ◽  
No-Kuk Park ◽  
Tae Jin Lee ◽  
Won Gun Lee ◽  
...  
Keyword(s):  
Particle Size ◽  
Low Temperature ◽  
Zeta Potential ◽  
Specific Surface ◽  
Acidic Solution ◽  
Solvothermal Method ◽  
Solvothermal Reaction ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
Ph Conditions

This study demonstrates the low temperature synthesis ofα-Al2O3by solvothermal method using gibbsite alumina precursor in 1, 4-butanediol solvent according to various pH conditions. In acidic solution, an orthorhombic boehmite (AlOOH) structure was obtained after solvothermal reaction. A significant result in this study was that the solvothermally synthesized alumina inpH=9at 300 °C for 36 h represented a rhombohedralα-Al2O3structure hexagonal shaped with about 1.5~2.0 μm of particle size. Otherwise, theα-Al2O3structure was rather changed to the mixture of a boehmite andα-Al2O3structures abovepH=11. In the case ofα-Al2O3synthesized atpH=9, the specific surface area was 26.18 m2/g, and the particles that were stable in acidic solution resulted in 61.80 mV of zeta potential.

scholarly journals Low temperature synthesis and characterization of Mn3O4 nanoparticles

2007 ◽  
Vol 5 (1) ◽  
pp. 169-176 ◽  
Author(s):  
Abdülhadi Baykal ◽  
Yüksel Köseoğlu ◽  
Mehmet Şenel
Keyword(s):  
Particle Size ◽  
Infrared Spectroscopy ◽  
Low Temperature ◽  
Synthesis And Characterization ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
X Ray ◽  
Peak Broadening ◽  
Mn3o4 Nanoparticles

AbstractHeating hydrous manganese (II) hydroxide gel at 85 °C for 12 hours produces Mn3O4 nanoparticles. They were characterized by X-ray powder diffraction (XRD) and infrared spectroscopy (FTIR). The particle size estimated from the SEM and X-ray peak broadening is approximately 32 nm, showing them to be nanocrystalline. EPR measurements confirm a typical Mn2+signal with a highly resolved hyperfine structure.

scholarly journals LOW-TEMPERATURE SYNTHESIS OF SUPERPARAMAGNETIC Zn0.8Ni0.2Fe2O4 FERRITE NANOPARTICLES

2018 ◽  
Vol 56 (1) ◽  
pp. 31
Author(s):  
Luong Thi Quynh Anh ◽  
Nguyen Van Dan ◽  
Do Minh Nghiep
Keyword(s):  
Particle Size ◽  
Magnetic Properties ◽  
Oleic Acid ◽  
Low Temperature ◽  
Coercive Force ◽  
Saturation Magnetization ◽  
Ferrite Nanoparticles ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
Co Precipitation

The crystalline nanoparticles of Ni0.2Zn0.8Fe2O4 ferrite were synthesized by chemical co-precipitation with precursor concentration of 0.1M, then modified by 0.25M solution of oleic acid in pentanol, finally heated at temperatures 120, 140, 160 and 180oC for 6h in autoclave. The XRD, EDS and TEM confirmed that all of samples are crystalline and their particle size are 6, 6.5, 7 and 8 nm. The magnetic properties showed that the coercive force, the remanence of samples are about zero, the saturation magnetization Ms has values from 14.20 to 27.12 emu/g.

scholarly journals Low-temperature synthesis of zeolite from perlite waste — Part II: characteristics of the products

2014 ◽  
Vol 32 (4) ◽  
pp. 526-532 ◽  
Author(s):  
Magdalena Król ◽  
Justyna Morawska ◽  
Włodzimierz Mozgawa ◽  
Waldemar Pichór
Keyword(s):  
Phase Composition ◽  
Low Temperature ◽  
Specific Surface ◽  
Cation Exchange ◽  
Cation Exchange Capacity ◽  
Exchange Capacity ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
Synthesis Parameters ◽  
Autogenous Pressure

AbstractThe paper investigates the properties of sodium zeolites synthesized using the hydrothermal method under autogenous pressure at low temperature with NaOH solutions of varying concentrations. During this modification, zeolites X, Na-P1 and hydroxysodalite were synthesized. The synthesis parameters, and thus, phase composition of resulting samples, significantly affected the specific surface area (SSA) and cation exchange capacity (CEC). SSA increased from 2.9 m2/g to a maximum of 501.2 m2/g, while CEC rose from 16 meq/100 g to a maximum of 500 meq/100 g. The best properties for use as a sorbent were obtained for perlite waste modified with 4.0 M NaOH at 70 °C or 80 °C.

L3xLa2/3-XTiO3 Nanoparticles Obtained from a Low Temperature Synthesis Route

2011 ◽  
Vol 14 ◽  
pp. 105-111 ◽  
Author(s):  
Teobaldo Mariño Otero ◽  
Yodalgis Mosqueda Laffita ◽  
Carlos Ricardo Milian Pila ◽  
Eduardo Pérez Cappe
Keyword(s):  
Thermal Decomposition ◽  
Particle Size ◽  
Low Temperature ◽  
Chemical Compound ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
Electrochemical Application ◽  
Citrate Precursor ◽  
Very Low Temperature

In this work, the synthesis of Li3xLa2/3-xTiO3 oxide is studied by thermal decomposition of citrate precursor at very low temperature which has not been yet reported in the literature for these compounds. The characterization of oxides and its precursor was realized by DRX, IR, ATD and TEM techniques. The results show the formation of a new chemical compound (precursor) as well as several advantages of the citrate method in relation to reported ones in the literature: the ostensible decreasing of temperature Li3xLa2/3-xTiO3 formation and the decreasing of particle size on the nanometric scale which is very desirable for the electrochemical application.

Low-temperature synthesis of β-Ga2O3 nanorods on SBA-15 microparticles by solvothermal method

2006 ◽  
Vol 17 (23) ◽  
pp. 5858-5861 ◽  
Author(s):  
Ligang Gai ◽  
Haihui Jiang ◽  
Yan tian ◽  
Deliang Cui ◽  
Qilong Wang
Keyword(s):  
Low Temperature ◽  
Solvothermal Method ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis

Low temperature synthesis of monodisperse nanoscaled ZrO2with a large specific surface area

2013 ◽  
Vol 42 (2) ◽  
pp. 432-440 ◽  
Author(s):  
Nicole Zink ◽  
Franziska Emmerling ◽  
Tobias Häger ◽  
Martin Panthöfer ◽  
Muhammad Nawaz Tahir ◽  
...  
Keyword(s):  
Low Temperature ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Large Specific Surface Area ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis

scholarly journals LOW-TEMPERATURE SYNTHESIS OF BARIUM TITANITE IN AQUEOUS SOLUTION

2018 ◽  
Vol 61 (12) ◽  
pp. 56-62 ◽  
Author(s):  
Alexandr V. Agafonov ◽  
Konstantin V. Ivanov ◽  
Olga V. Alekseeva
Keyword(s):  
Heat Treatment ◽  
Barium Titanate ◽  
Thermal Treatment ◽  
Low Temperature ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Temperature Phase ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis

Barium titanate powder with average particle size near 300 nm was produced using the low-temperature synthesis. It was established using scanning electron microscopy that at the thermal treatment, the particles gradually decrease with the formation of polydisperse aggregates. Based on the thermogravimetric analysis of the synthesized powder held in air for 4 months, it was shown that along with the low-temperature phase, the sample contains a high-temperature phase of carbonates, which removes at ~ 900 °C. Sorption characteristics of barium titanate thermally treated at various temperatures were obtained from the results of adsorption-desorption of nitrogen vapors. The specific surface area of the BaTiO3 powder was 76 m2/g. It was found that further heat treatment leads to a decrease in the specific surface area. The X-ray diffraction analysis of barium hydroxotitanil annealed at temperatures from 120 °C to 800 °C showed that the thermal treatment of the sample leads to the formation of a completely formed phase of barium titanate. The DSC temperature was used to determine the Curie temperatures for a HTB powder thermally treated in the temperature range from 120 to 800 °C. Dielectric spectra of suspensions of the synthesized powder were obtained during the heat treatment. <span style="opacity: 0;"> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . </span>

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