scholarly journals A Comparative Study on the Addition Methods of TiO2 Sintering Aid to the Properties of Porous Alumina Membrane Support

Membranes ◽  
2018 ◽  
Vol 8 (3) ◽  
pp. 49 ◽  
Author(s):  
Yulong Yang ◽  
Qibing Chang ◽  
Zhiwen Hu ◽  
Xiaozhen Zhang
Keyword(s):  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Bending Strength ◽  
Porous Alumina ◽  
Alumina Membrane ◽  
Sintering Aid ◽  
Hydrolysis Method ◽  
Porous Alumina Membrane

TiO2 is usually used as a sintering aid to lower the sintering temperature of porous alumina membrane support. Two ways of the addition of TiO2 are chosen: in-situ precipitation and in-situ hydrolysis. The results show that the distribution status of TiO2 has an important effect on the property of porous alumina membrane support. In in-situ hydrolysis method, the nano-meter scale TiO2 distributes evenly on the alumina particles’ surface. The bending strength of the support increases sharply and the pore size distribution changes more sharply along with the content of TiO2 which slightly increases from 0.3 wt.% to 0.4 wt.%. The distribution of the nano-meter scale TiO2 is not so even added by in-situ precipitation method. Neither the bending strength nor the pore size distribution of the support is worse than that of the support added by in-situ hydrolysis even if the content of TiO2 is high to 2 wt.%. The permeating flux has a similar tendency. Consequently, the porous alumina membrane support has the porosity of 30.01% and the bending strength of 77.33 MPa after sintering at 1650 °C for 2 h with the optimized TiO2 content of 0.4 wt.% added by the in-situ hydrolysis method.

Preparation of SiC Nanoporous Membrane for Hydrogen Separation at High Temperature

2006 ◽  
Vol 510-511 ◽  
pp. 926-929 ◽  
Author(s):  
Y. Kim ◽  
Soo Ryong Kim ◽  
Kun Hang Cho ◽  
Seong Youl Bae ◽  
Woo Teck Kwon
Keyword(s):  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Porous Alumina ◽  
Amorphous State ◽  
Hydrogen Separation ◽  
Preceramic Polymer ◽  
Preceramic Polymers ◽  
Coating Method ◽  
Ft Ir

Nanoporous SiC membrane was developed on the porous alumina plate for the hydrogen separation using preceramic polymers such as polyphenylcarbosilane. The prepared preceramic polymers were characterized with FT-IR, TGA, GPC and XRD. Nanoporous SiC membrane was derived from the preceramic polymer using a spin coating method. The SiC membrane spin coated using 20 wt.% of polyphenylcarbosilane solution in cyclohexane does not show any cracks on the surface after heat treatment at 800oC. The average thickness of the SiC membrane is about 1µm. SiC coated porous alumina possesses asymmetric pore size distribution. There are micropores that originated from porous alumina substrate, and nanopores that derived from amorphous state of SiC membranes. The pore size distribution measurement showed that the sample contains 1-3 nm sized nano pores.

Carbon-Doped Hollow Titania with Tuneable Shell Architecture for Supercapacitors

2016 ◽  
Vol 69 (2) ◽  
pp. 183 ◽  
Author(s):  
Juanrong Chen ◽  
Fengxian Qiu ◽  
Ying Zhang ◽  
Shunsheng Cao
Keyword(s):  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
High Performance ◽  
Electrode Materials ◽  
Carbon Doping ◽  
Narrow Pore Size Distribution ◽  
Carbon Doped

A new trend in supercapacitor research has focussed on the construction of inexpensive electrode materials with high capacitor performances. In this study, we demonstrate the successful preparation of carbon-doped hollow titania spheres. The as-prepared titania spheres not only exhibit an advantage over existing methods because they are created in situ by directly carbonizing cationic polystyrene templates without the addition of carbon precursors, but also feature a narrow pore size distribution and a tuneable shell architecture. When the materials were applied as supercapacitor anodes, the electrochemical results reveal the superior performances of the supercapacitors over that of commercial P25. The higher performances were attributed to carbon doping. Thus, the reported C-doped hollow titania shows more potential as electrode materials for high-performance supercapacitors.

Water Adsorption in Nanoporous Carbon Characterized by in Situ NMR: Measurements of Pore Size and Pore Size Distribution

2014 ◽  
Vol 118 (16) ◽  
pp. 8474-8480 ◽  
Author(s):  
Hai-Jing Wang ◽  
Alfred Kleinhammes ◽  
Thomas P. McNicholas ◽  
Jie Liu ◽  
Yue Wu
Keyword(s):  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Water Adsorption ◽  
Nanoporous Carbon ◽  
In Situ Nmr

Biphasic calcium phosphate scaffolds with controlled pore size distribution prepared by in-situ foaming

2019 ◽  
Vol 95 ◽  
pp. 363-370 ◽  
Author(s):  
Lenka Novotna ◽  
Lukas Kucera ◽  
Ales Hampl ◽  
Daniel Drdlik ◽  
Jaroslav Cihlar ◽  
...  
Keyword(s):  
Calcium Phosphate ◽  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Biphasic Calcium Phosphate

scholarly journals In-Situ Pore Structure Analysis During Aging and Drying of Gels

1990 ◽  
Vol 180 ◽  
Author(s):  
Douglas M. Smith ◽  
Pamela J. Davis ◽  
C. Jeffrey Brinker
Keyword(s):  
Pore Structure ◽  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Surface Area ◽  
Pore Fluid ◽  
Structure Evolution ◽  
High Ph ◽  
Drying Rates

ABSTRACTThe use of NMR relaxation measurements for the in-situ study of pore structure evolution during gel aging and drying is illustrated. The change in the pore size distribution and surface area of both wet and dried gels is examined as a function of aging conditions including temporal aging, thermal aging, changing pH, and changing pore fluid. The effect of pore fluid pH on dissolution/reprecipitation in ordered packings of monodisperse silica spheres is also examined as a model system for particulate gels. As expected, the pore size distribution narrows with increasing time of treatment in high pH pore fluids. Interpretation of high pH results for the wet state is complicated by a microporous layer which forms on colloidal silica resulting in significantly larger wet surface area as compared to the final dried material. Narrowing of the pore size distribution, which is of interest for maximizing drying rates, is maximized in the least time by using either high pH or repeated ethanol washes for the base-catalyzed gel (B2) used.

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