Surface area enhancement of silica fibers by sol-gel processes.Journal of Non-Crystalline Solids (1995)
Non-porous silica fibers, 1 μm in diameter and up to 100 μm long, have been coated by dispersion in silica sols in order to increase their specific surface area and improve the adsorption capacity for chromatographic bioseparations. Both acid- and base-catalyzed sols were investigated. Coatings with an acid-catalyzed sol resulted in a hundredfold increase in the specific surface area of the fiber. However, formation of fiber flocks by this method caused problems in packing chromatographic columns with these fibers. By contrast, coatings by dispersion in base-catalyzed sols resulted in looser flocks that facilitated column packing. Various sol compositions and fiber mass concentrations in base-catalyzed sols increased the specific surface area of the fibers by up to 30 times. Washing with acetone or ethanol reduced the specific surface area of the coated fibers by about 80%.
Publication DateApril, 1995
Citation InformationGeorge P. Fotou, Sotiris E. Pratsinis and Neville G. Pinto. "Surface area enhancement of silica fibers by sol-gel processes." Journal of Non-Crystalline Solids Vol. 183 Iss. 1-2 (1995) p. 135 - 143
Available at: http://works.bepress.com/neville-pinto/19/