Pore size distribution of unsupported SnO2 membranes prepared by sol-gel process

1994 ◽  
Vol 2 (1-3) ◽  
pp. 575-579 ◽  
Author(s):  
Giancarlo Espósito de Souza Brito ◽  
Sandra Helena Pulcinelli ◽  
Celso Valentim Santilli
Keyword(s):  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Sol Gel ◽  
Sol Gel Process

Control of pore size distribution of silica gel through sol-gel process using inorganic salts and surfactants as additives

1992 ◽  
Vol 27 (6) ◽  
pp. 1567-1574 ◽  
Author(s):  
Tadahiro Murakata ◽  
Shimio Sato ◽  
Takashi Ohgawara ◽  
Tetushi Watanabe ◽  
Tohru Suzuki
Keyword(s):  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Silica Gel ◽  
Sol Gel ◽  
Inorganic Salts ◽  
Sol Gel Process

Thermal Conductivity of Sol-Gel Bonded Castables

2008 ◽  
Vol 368-372 ◽  
pp. 1146-1148
Author(s):  
Feng Cao ◽  
C.Y. Wang ◽  
P.S. Tang ◽  
C.Y. Lu ◽  
H.F. Chen ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Glassy Phase ◽  
Size Structure ◽  
Sol Gel ◽  
Refractory Castables ◽  
Silica Alumina ◽  
Alumina Sol

The silica-alumina sol bonding agent, prepared by the sol gel route from ethyl silicate and aluminium isopropanol, was utilized in the refractory castables. The influence of structure on the heat transfer has been investigated using different sorts of refractory matrix. The results indicated that the heat conductivity of sol-gel bonded castables was considerably affected by their structure. The phase composition of matrix, porosity, pore size distribution and pore size structure were the most important factors. Thermal conductivity has been measured from the ambient temperature up to 1250 °C. The influence of crystalline phases and the glassy phase formation and the influence of the pore size distribution on the thermal conductivity were also described in this work.

Theory of Nuclear Relaxation in Confining Systems. Application to Non Wetting Liquids in Porous Silica Glasses

1992 ◽  
Vol 290 ◽  
Author(s):  
J.-P. Korb ◽  
A. Delville ◽  
Shu Xu ◽  
J. Jonas
Keyword(s):  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Sol Gel ◽  
Porous Silica ◽  
Nuclear Relaxation ◽  
Narrow Pore Size Distribution ◽  
Silica Glasses ◽  
Frequency Dependences ◽  
Wetting Liquid

AbstractThis work shows how the geometrical confinements enhances the nuclear relaxation of a non wetting liquid in a model porous systems. Application of the proposed theory is made to interpret the size and frequency dependences of the 1H relaxation of methylcyclohexane liquid in sol-gel porous silica glasses with narrow pore-size distribution.

scholarly journals Conducting Membranes and Coatings made from Redispersable Nanoscaled Crystalline SnO2:Sb Particles

1998 ◽  
Vol 520 ◽  
Author(s):  
C. Goebbert ◽  
M. A. Aegerter ◽  
D. Burgard ◽  
R. Nass ◽  
H. Schmidt
Keyword(s):  
Thermal Treatment ◽  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Sol Gel ◽  
Total Porosity ◽  
Solid Content ◽  
Visible Range ◽  
Inorganic Membranes ◽  
Separation Processes

ABSTRACTInorganic membranes prepared by the sol gel method are promising candidates for use as filters in separation processes. Conducting supported membranes and coatings have been produced from redispersable nanoscaled crystalline Sb-doped SnO2 powders with a Sb content up to 5 mole % (with respect to Sn). The crystalline particles are monosized (≅4 nm) and fully redispersable in aqueous solution at pH ≥ 8 with a solid content up to 70 wt. %. By thermal treatment at different temperatures and times, the pore size diameter of the material can be adjusted from 4 to 20 nm with a very narrow pore size distribution (∼ ±1 nm) and a total porosity of 63 %, practically independent of the sintering parameters. Uniaxial pressed substrates present similar characteristics with however larger pore size distribution (±5 nm) and 80 % total porosity. Their resistance decreases with sintering temperature and time down to 4 Ω (800 °C 8 h). Fully dispersed aqueous solutions of the powder (25 wt. %) were used to prepare transparent conducting coatings on glass or ceramics by spin-coating. After thermal treatment (1 hour at 550 °C) single layers 200 nm thick exhibited a typical specific electrical resistance ρ = 2.5·10−2 ωcm with transmission in the visible range measured against air of 90%.

Quantitative stereological analysis of the pore-size distribution in a colloidal silica sol-gel

1990 ◽  
Vol 48 (4) ◽  
pp. 1078-1079
Author(s):  
Helen M. Kerch ◽  
Rosario Gerhardt
Keyword(s):  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Pore Diameter ◽  
Sol Gel ◽  
Image Analyzer ◽  
Average Pore ◽  
Thin Sections ◽  
Stereological Analysis ◽  
Colloidal Gel

The pore size distribution of an unsintered colloidal gel has been determined by stereological analysis of ultramicrotomed thin sections (70 nm) of the gel. This is a novel use of the ultramicrotomy technique as the epoxy represents the porous phase of the microstructure rather than just the medium used to maintain a coherent structure during thinning. In order to obtain statistically significant pore size information a nested sampling scheme was carried out, and a total of 36 two-dimensional fields taken at 19,000 X were examined. Pore diameters were measured with a digital image analyzer which measured 15 projected diameters every 12° from the center of the feature. Stereological quantities obtained were average pore diameter (Davg), number of pores per unit area (NA), and number of pores per unit volume (NV).

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