Jiahai Bai

Name:

Organization: Shandong University of Technology

Department: School of Materials Science and Engineering

Title:

Chemicals
References

Fabrication of porous Al2O3–MgAl2O4 ceramics using combustion-synthesized powders containing in situ produced pore-forming agents

Co-reporter:JiaHai Bai, Chuncheng Wei, Fantao Meng, Juncheng Liu, Ping Wang, Qingyang Du, Zhuxing Tang

Materials Letters 2011 Volume 65(Issue 11) pp:1559-1561

Publication Date(Web):15 June 2011

DOI:10.1016/j.matlet.2011.02.069

Novel pore-forming agents as well as other starting materials were produced in situ via a solution combustion process and were used to fabricate porous Al2O3–MgAl2O4 ceramics. The relative fuel-to-oxidant ratios (φe) of 1.06, 1.28, 1.49 and 1.70 were achieved by varying the amount of starch in the precursors. Effects of φe on the weight percent of the pore-forming agents in the powders, open porosity and Vickers hardness of the as-prepared porous ceramics were investigated. Experimental results revealed that the weight percent of the pore-forming agents in the powders increased significantly, while porosity of the as-prepared ceramics first increased and then decreased as φe rose from 1.06 to 1.70. Meanwhile, pore size distribution became far narrower and the Vickers hardness of the porous ceramics increased as φe increased.

Mixture of fuels approach for solution combustion synthesis of nanoscale MgAl2O4 powders

Co-reporter:Jiahai Bai, Juncheng Liu, Chengfeng Li, Guochang Li, Qingyang Du

Advanced Powder Technology 2011 Volume 22(Issue 1) pp:72-76

Publication Date(Web):January 2011

DOI:10.1016/j.apt.2010.03.013

Abstract

Nanoscale MgAl₂O₄ powders were synthesized via a microwave-assisted solution combustion process using various mixtures of urea, glycine and starch as fuel. The effects of starch addition on characteristics (e.g. specific surface area and crystallite size) of the as-resulted powders were also investigated. The experimental results revealed that the specific surface area of the powders was significantly increased as the starch content rose from 0 to 35.6 wt.%, followed by a slight decrease when it was further raised to 54.7 wt.%. The scanning electron microscope micrographs disclosed that starch addition also affected the morphology of porous nanoparticles’ agglomerates and was remarkably beneficial to dissipate the as-produced nanoparticles. Higher degree of dissipation and larger specific surface area of the powders resulted from starch addition were mainly attributed to a larger amount of gases evolved during combustion and/or lower combustion temperature.

Synthesis and photocatalytic activity of cobalt oxide doped ZnFe2O4–Fe2O3–ZnO mixed oxides

Co-reporter:Jiahai Bai

Materials Letters 2009 Volume 63(Issue 17) pp:1485-1488

Publication Date(Web):15 July 2009

DOI:10.1016/j.matlet.2009.03.052

Novel cobalt oxide doped ZnFe2O4–Fe2O3–ZnO mixed oxides with the Zn/Fe molar ratio of 1/2 were synthesized with a citric acid complex method. The effects of cobalt oxide and calcination temperature on phase composition and photocatalytic activity of the mixed oxides were investigated. X-ray diffraction (XRD) analysis revealed that there were mainly ZnFe2O4, α-Fe2O3, amorphous ZnO and Fe2O3 in the 6 mol% cobalt oxide doped products calcined at 500 °C. 5–10 mol% cobalt oxide doping could significantly enhance the formation of ZnFe2O4 and altered the phase composition of the mixed oxides. Experimental results showed that cobalt oxide doping could remarkably improve the photocatalytic activity of the mixed oxides for phenol degradation. The 6 mol% cobalt oxide doped mixed oxides calcined at 500 °C exhibited better photocatalytic activity as compared with other samples.

CAS:12408-02-5

Hydrogen cation

CAS:3227-63-2

ZIRCONIUM(2+);DIACETATE

3',6'-Dihydroxy-3H-spiro[isobenzofuran-1,9'-xanthen]-3-one

CAS:2321-07-5

3',6'-Dihydroxy-3H-spiro[isobenzofuran-1,9'-xanthen]-3-one