Chemisorption of diborane of silica gel: a study of the changes in pore structure

Abstract

The chemisorption of diborane on silica gel strongly influences the porosity of the structure. A method, based on a cylindrical pore model, is proposed to probe the pore-narrowing as well as the pore-blocking of a mesoporous silica gel. It was observed that pore-narrowing increases linearly with the averge pore diameter, while poreblocking decreases with an increasing pore diameter. The proposed method proved to be suitable for semiquantitative ap pl ication.

Porous Materials

“…Although the reactivity of the silica gel with various compounds was investigated extensively, there are only a few attempts to determine their effect on the pore structure of the silica gels [113]. Gillis-D'Hamers et al [113] investigated the role of chemisorption of diborane on the changes in pore structure of three silica gels with surface areas of 593, 416 and 317 m 2 / g and pore diameters of 4.1,6.9 and 12.9nm, respectively.…”

“…Gillis-D'Hamers et al [113] investigated the role of chemisorption of diborane on the changes in pore structure of three silica gels with surface areas of 593, 416 and 317 m 2 / g and pore diameters of 4.1,6.9 and 12.9nm, respectively. Their results showed: surface area decreased with increasing diborane loading (Figure 4.47), the extent of pore-blocking was inversely proportional to the average pore diameter and ends at an average pore diameter of ~ 12 nm, and pore-narrowing exhibited a positive linear dependence on the average pore diameter (Figure 4.48).…”

“…Interconnected continuous pores oflength 0.1 to 100{1m were prepared in silica gel with TMOS and poly(sodium styrenesulfonate) (NaPSS) depending upon various reaction parameters [118]. Table 4.26 shows typical Reproduced with permission from [113] © 1992 Royal Society of Chemistry.…”