The spatial distribution of poly(methyloctylsiloxane) deposited by solvent evaporation in the pores of HPLC silica particles |
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Authors: | K E Collins M L M M Granja R G Pereira Filho T A Anazawa I C S F Jardim |
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Institution: | (1) Instituto de Química, UNICAMP, Caixa Postal 6154, 13083-970 Campinas, SP, Brazil |
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Abstract: | Summary Poly(methyloctylsiloxane) (PMOS), sorbed into the pores of HPLC silica particles by solvent evaporation, can function as a
useful stationary phase for reversed-phase chromatography. The present work addresses the question of how the PMOS is distributed
in the pores. Measurements of the surface area (BET, N2) of a series of partially loaded samples (0–40% PMOS, m/m) using a typical batch of HPLC silica (10 μm irregular particles
with 6 nm pores) show that the specific surface area of the samples decreases linearly with the specific loading (mass of
PMOS per gram of silica). This result is not consistent with a “film” model in which the PMOS is deposited uniformly on the
pore walls, but is consistent with a model in which long segmented “plugs” of PMOS are deposited within the pore system.
Presented at the 21st ISC held in Stuttgart, Germany, 15th–20th September, 1996 |
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Keywords: | Column liquid chromatography Porous silica Poly(methyloctylsiloxane) Polymer sorption Polymer distribution |
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