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|Type:||Artigo de evento|
|Title:||The Spatial Distribution Of Poly(methyloctylsiloxane) Deposited By Solvent Evaporation In The Pores Of Hplc Silica Particles|
|Abstract:||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, N 2) 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.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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