Showing papers on "BET theory published in 1971"
TL;DR: In this paper, American coals and chars have been compared with commercially available active carbons for dye adsorption, showing that the amount of dye removed from solution by raw coals is made up of two parts, one due to interaction with some mineral constituents and the other due to adorption on the porous surface.
37 citations
TL;DR: The Carlo Erba Sorptomatic has been used to determine reproducible nitrogen adsorption/desorption isotherms which are fully comparable with those obtained from conventional apparatus.
11 citations
TL;DR: In this paper, the same authors presented an analysis of adsorption isotherms and isosteric heat data for various nonpolar gases on oxide, metal, salt and graphite adsorbents, and showed that the electric field emanating from the surface and/or the structure of the surface still strongly affects the molecular interactions in the higher adsorbed layers.
10 citations
TL;DR: The effect of heat treatment and fluoridation of the surface on the adsorption of n-butane on porous glass was studied in this paper, where a cylindrical pore model inadequately correlated changes in specific surface, mean pore radius and porosity.
Abstract: The effect of heat treatment and fluoridation of the surface on the adsorption of n-butane on porous glass was studied. The BET surface area, pore-size distribution, and porosity were obtained from N2 isotherms of samples successively heated at temperatures from 350° to 865°C. Deformation of the bulk structure began at 700°C. A cylindrical pore model inadequately correlated changes in specific surface, mean pore radius, and porosity. Surface heterogeneity was decreased to some extent by heat treatment at 865°C. Treatment of the surface with HF caused no significant change in the heat of adsorption from that of the untreated sample. Adsorption sites other than surface silanol groups are proposed to explain the results.
5 citations
Patent•
18 Mar 1971
TL;DR: Paste consists of liquid cleaning agent (e.g. dilute H2SO4) with very finely dispersed SiO2 of highest possible degree of purity as paste former.
Abstract: Paste consists of liquid cleaning agent (e.g. dilute H2SO4) with very finely dispersed SiO2 of highest possible degree of purity as paste former. Pref. 6-20, esp. 10 wt. % SiO2 with BET surface area 100-300, esp. 150 - 20 m2/g. are used. This SiO2 has extremely high ab- and ad-sorptive power, so that strong uniform cleaning occurs. Paste is suitable for cleaning and picking steel, Fe, light and non-ferrous metals, esp. high-grade steel. Unlike other pastes, it does not fume.
1 citations
TL;DR: The surface roughness of 304 stainless steel by Brunauer-Emmett-Teller measurements, using ethylene as adsorbate, was measured by as mentioned in this paper, using the same method.
Abstract: Surface roughness of 304 stainless steel by Brunauer-Emmett-Teller measurements, using ethylene as adsorbate
1 citations
01 Jan 1971
TL;DR: A modified Gravimat, which is a sorption apparatus that includes the Gast microbalance, has been used to measure sorption isotherms of nitrogen, krypton, methane, propane, and 2,2-dimethylpropane on glass, gold, aluminum, and polytetrafluoroethylene (PTFE) as mentioned in this paper.
Abstract: A modified Gravimat, which is a sorption apparatus that includes the Gast microbalance, has been used to measure sorption isotherms of nitrogen, krypton, methane, propane, and 2,2-dimethylpropane on glass, gold, aluminum, and polytetrafluoroethylene (PTFE). Cross-sectional areas of the adsorbates derived from the Isotherms on the basis of the BET theory are compared for the different adsorbents.