scholarly journals The preparation of MgO nanopowders synthesized via an improved polyacrylamide gel method

RSC Advances ◽  
2019 ◽  
Vol 9 (26) ◽  
pp. 14893-14898 ◽  
Author(s):  
Xiaojun Zhao ◽  
Haitang Yang ◽  
Pengfei Wu ◽  
Xiaozhong Huang ◽  
Xiaofeng Wang
Keyword(s):  
Citric Acid ◽  
Metal Ion ◽  
Chelating Agent ◽  
Polyacrylamide Gel ◽  
Gel Method ◽  
Polyacrylamide Gel Route ◽  
Polyacrylamide Gel Method ◽  
Ion Incorporation

In order to address the issue of metal ion incorporation during polymerization, citric acid was used as a chelating agent to improve the polyacrylamide gel route.

Rapid Synthesis of Bi Substituted Ca3Co4O9 by a Polyacrylamide Gel Method and its High-Temperature Thermoelectric Power Factor

2010 ◽  
Vol 434-435 ◽  
pp. 393-396 ◽  
Author(s):  
Ying Song ◽  
Qiu Sun ◽  
Li Rong Zhao ◽  
Fu Ping Wang
Keyword(s):  
High Temperature ◽  
Thermoelectric Power ◽  
Power Factor ◽  
Solid State Reaction Method ◽  
Polyacrylamide Gel ◽  
Measured Temperature ◽  
Thermoelectric Power Factor ◽  
Gel Method ◽  
Plasma Sintering ◽  
Polyacrylamide Gel Method

A series of polycrystalline (Ca1-xBix)3Co4O9 ( x = 0.0 ~ 0.075 ) powders were synthesized rapidly by a polyacrylamide gel method. The dense ceramics were fabricated using the spark plasma sintering ( SPS ) technique. Effects of Bi substitution on high temperature thermoelectric properties of Ca3Co4O9 were evaluated. Both the electrical conductivity and Seebeck coefficient increased with increasing Bi content up to x = 0.05, thus leading to an enhanced thermoelectric power factor. The Bi substituted sample with x = 0.05 obtained in this study has the highest thermoelectric power factor in the measured temperature range. It reaches 4.810-4 Wm-1K-2 at 700 °C, which is 26 % higher than that of Ca3Co4O9 without Bi substitution, and is by up to 15 % larger as compared to the Bi substituted sample synthesized by the solid state reaction method and the SPS technique due to the high chemical homogeneous powder prepared by the polyacrylamide gel method.

Preparation of nano-TiO 2 powder by polyacrylamide gel method

2009 ◽  
Author(s):  
Xiaowei Fan ◽  
Xiaoping Liang ◽  
Guanqun Guo ◽  
Rongtao Wang ◽  
Jianxin Li
Keyword(s):  
Polyacrylamide Gel ◽  
Gel Method ◽  
Polyacrylamide Gel Method

Effect of excess Ca2+ on the formation of CaZrO3 powders via polyacrylamide gel method

2019 ◽  
Vol 9 (4) ◽  
pp. 310-318 ◽  
Author(s):  
Kuo Huang ◽  
Bin Xie ◽  
Xiaoyang Chen ◽  
Yi Zhang ◽  
Taolan Mo ◽  
...  
Keyword(s):  
Polyacrylamide Gel ◽  
Gel Method ◽  
Polyacrylamide Gel Method

Preparation and Characterization of Cordierite Powder via Tween-80 Modified Citrate Sol-Gel Method

2010 ◽  
Vol 148-149 ◽  
pp. 929-933
Author(s):  
Yu Yue Wang ◽  
Juan Juan Feng ◽  
Yi Liu
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Citric Acid ◽  
Metal Ion ◽  
Sol Gel ◽  
Chelating Agent ◽  
Particle Morphology ◽  
Tween 80 ◽  
Solvent Evaporation Process ◽  
Scanning Electron

In this paper, cordierite (2MgO•2Al2O3•5SiO2) precursors are synthesized using TEOS and aluminum and magnesium nitrates as starting materials, citric acid as chelating agent and Tween-80 as dispersant. The effect of citric acid and Tween-80 on the formation mechanism of α-cordierite phase is investigated by using X-ray diffraction (XRD), while the effect of citric acid and Tween-80 on the particle morphology of α-cordierite is examined by using scanning electron microscopy (SEM) and field emission scanning electron microscopy (FESEM). The results show that citric acid used as chelating agent can reduce the formation temperature of α-cordierite to 1150°C by forming stable salt of citric acid with all the metal ion to avoid composition deviation from the sample components during solvent evaporation process and sub-micron cordierite particles without hard agglomeration can be obtained. Nano-sized α-cordierite can be obtained with the introduction of Tween-80 as dispersant by modifying the surfaces of the colloidal sol particles.

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