Pore Size Distribution off "in situ" Coated Silica Gels Determined by Exclusion Chromatography

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.

Download Full-text

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

The Journal of Physical Chemistry C ◽

10.1021/jp501518f ◽

2014 ◽

Vol 118 (16) ◽

pp. 8474-8480 ◽

Cited By ~ 19

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

Download Full-text

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

Materials Science and Engineering C ◽

10.1016/j.msec.2018.03.022 ◽

2019 ◽

Vol 95 ◽

pp. 363-370 ◽

Cited By ~ 7

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

Download Full-text

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

MRS Proceedings ◽

10.1557/proc-180-235 ◽

1990 ◽

Vol 180 ◽

Cited By ~ 2

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.

Download Full-text