A physicochemical study of polypyrrole-silica nanocomposites by inverse gas chromatography

被引:35
作者
Perruchot, C [1 ]
Chehimi, MM [1 ]
Delamar, M [1 ]
Lascelles, SF [1 ]
Armes, SP [1 ]
机构
[1] UNIV SUSSEX, SCH CHEM PHYS & ENVIRONM SCI, BRIGHTON BN1 9QJ, E SUSSEX, ENGLAND
关键词
polypyrrole; silica; nanocomposites; inverse gas chromatography; surface energy; dispersive interactions; microporosity;
D O I
10.1006/jcis.1997.5049
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Three polypyrrole-silica nanocomposites were characterized by inverse gas chromatography (IGC) at 60 and 80 degrees C using both linear and branched alkane probes. The IGC data for these materials were compared with those obtained for the ultrafine silica sol and polypyrrole (PPB) bulk powder reference materials, The London components of the surface energies (gamma(s)(d)) of the nanocomposites were in the range 115-225 mJ m(-2) at 60 degrees C. These values are much higher than those obtained for either the polypyrrole powders or the colloidal silica sol, which suggests that the nanocomposites have significant microporosity. The gamma(s)(d) values for the nanocomposites decrease in the order chloride-doped PPy > sulfate-doped PPy > tosylate-doped PPy, which is the same trend as that found for the heat of adsorption (Delta H-a) of a given n-alkane. Delta H-a values of the linear and branched alkanes are up to three times higher than the heats of vaporization, which confirms that the nanocomposites (and, to a lesser extent, the polypyrrole powders) have high adsorption capacities for these solutes. For a series of alkane isomers (e.g., C7H16 or C8H18), the difference between the Delta H-a values for the nanocomposites and the corresponding polypyrrole powders decreased as the degree of branching for these probes was increased, These observations suggest that the more sterically hindered probes are excluded from the microporous interior of the nanocomposites. (C) 1997 Academic Press.
引用
收藏
页码:190 / 199
页数:10
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