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Comparison of nitrogen adsorption isotherms of porous carbons before and after exposure to proteins yields information on the pore landscape that is unobtainable from small angle neutron scattering (SANS) [Carbon 2016; 106:142–151]. Two globular proteins, bovine serum albumin (BSA), and bovine pancreatic trypsin inhibitor (BPTI), are studied, with two different porous carbon substrates: a hydrophobic...
This article reports measurements of the concentration distribution of two model proteins adsorbed from aqueous solution by two different high surface area carbons, using small angle neutron and X-ray scattering (SANS and SAXS). The proteins investigated were bovine serum albumin (67 kDa), and bovine pancreatic trypsin inhibitor (BPTI), also known under the name aprotinin (6.5 kDa). The two carbon...
Mo-doped carbon aerogels were obtained in the polycondensation reaction of aqueous resorcinol and formaldehyde by adding Mo-salt at two different stages of the synthesis: (i) to the initial sol; (ii) by incipient wetting impregnation of the supercritically dried polymer gel. Molybdenum added during the polymerization yielded a more compact gel structure with practically no mesoporosity. With post-impregnation,...
Small angle neutron scattering is used to study the simultaneous adsorption of toluene and water vapor by a commercial high surface area carbon, oxidized to enhance its affinity for polar molecules. Owing to the smaller size of the molecule, water on its own penetrates the smallest defects in the carbon matrix more efficiently than does toluene, as revealed by the density of the carbon determined...
We studied the development of graphitization in carbonaceous materials derived from poly(p-phenylene benzobisoxazole) (PBO) pre-activated with carbon dioxide to burn-off degrees of 15 and 51wt.%. The activated materials were subsequently heat-treated at various temperatures comprised between 1600 and 2700°C. The changes in porous texture, structure and nanostructure were characterized by gas adsorption...
Structural changes in poly(p-phenylene benzobisoxazole) (PBO) derived carbon fibres (CFs), treated in the range 900°C⩽T⩽2700°C, are investigated by small- and wide-angle X-ray scattering (SAXS and WAXS), and by high-resolution transmission electron microscopy (HRTEM). SAXS detects rough interfaces within the fibres, normal to the fibre axis and belonging to a fibril structure. HRTEM and SAXS also...
The adsorption of water vapour in a high surface area commercial carbon, as-received and after different surface chemical treatments was investigated as a function of relative humidity by three separate techniques. While gravimetry and small and wide angle X-ray scattering measurements are in reasonable agreement, volumetric observations yielded isotherms with substantially lower values for the water...
The adsorption of non-polar and polar molecules, n-hexane and water, on activated carbons, functionalized by oxidation with concentrated nitric acid, is investigated by small angle X-ray scattering. A relative mass density function p(q) is introduced in order to trace the filling characteristics of these probe molecules in the pore structure. Inspection of p(q) shows that while the pores affected...
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