Effect of Silica on the Structure of Cetyltrimethylammonium Bromide

被引:36
作者
Zhang, Tan [1 ]
Xu, Gu [2 ]
Puckette, Jim [3 ]
Blum, Frank D. [1 ]
机构
[1] Oklahoma State Univ, Dept Chem, Stillwater, OK 74078 USA
[2] Brewer Sci Inc, Rolla, MO 65401 USA
[3] Oklahoma State Univ, Boone Pickens Sch Geol, Stillwater, OK 74078 USA
基金
美国国家科学基金会;
关键词
CATIONIC SURFACTANT; HEXADECYLTRIMETHYLAMMONIUM BROMIDE; PHASE-TRANSITIONS; WATER INTERFACE; ALKYL CHAINS; H-2; NMR; ADSORPTION; MICA; MONOLAYERS; MECHANISM;
D O I
10.1021/jp303338t
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
The association structures of cetyltrimethylammonium bromide (CTAB) in the presence of fumed silica nanoparticles were studied by temperature-modulated differential scanning calorimetry (TMDSC), thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR), and powder X-ray diffraction. CTAB association structures were found for the adsorption of surfactant on the silica surface namely: a monolayer, a second layer that completed a bilayer, and multilayer structures. The silica surface was found to lower both the melting and crystallization temperatures of the CTAB tails. Higher decomposition temperatures were observed for the near-surface structures compared to bulk CTAB. The enthalpy and entropy changes for CTAB during the melting and crystallization indicate that the CTAB molecules underwent significant structural changes, from surface to bulk-like structures. The enthalpies of melting and crystallization over a wide range of compositions were well modeled with the contributions from a surface monolayer (very small enthalpy of melting, less than 5 J/g, which increased linearly with adsorbed amount), a second layer corresponding to completion of a bilayer (small enthalpy of melting, around 58 J/g), and multilayers whose enthalpy increased exponentially from the bilayer to near the bulk value with an exponential constant of 1.2 mg/m(2).
引用
收藏
页码:11626 / 11634
页数:9
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