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- W2058743476 abstract "Excess intercalation of cationic surfactants into Na+-montmorillonites (MMTs) was investigated in organically modified silicates (OMSs), synthesized with MMTs and octadecylammonium chloride (OAC) by systematically varying the surfactant loading level from 0.625 to 1, 1.25, 1.56, 2, and 2.5 with respect to the cation exchange capacity (CEC) of MMTs. Wide-angle X-ray diffraction and thermogravimetric analysis results indicated that the continuous increase of interlayer distances came from the entering of surfactants into the interlayer of MMTs. Excess surfactants were extracted with a Soxhlet apparatus, which showed two kinds of intercalation states of surfactants in the interlayer when the surfactant loading level was beyond the CEC. Fourier transform infrared spectroscopy and differential scanning calorimetry were used to explore the microstructures of OMSs. It was found that the surfactants arranged more orderly as the loading level increased and the excess surfactants piled up in the interlayer together with counterions, forming a sandwiched surfactant layer. On the basis of the results, the layer structures of OMSs and the mechanism by which the surfactants entered the interlayer were expounded: surfactant cations entered the interlayer through cation exchange reactions and were tightly attracted to the silicate platelet surfaces when the surfactant loading level was below the CEC; however, excess cationic surfactants entered the interlayer together with counterions through hydrophobic bonding and formed a sandwiched layer in the interlayers, leading to a continuous increase of the interlayer distance, when the surfactant loading level was beyond the CEC." @default.
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- W2058743476 date "2003-09-24" @default.
- W2058743476 modified "2023-10-03" @default.
- W2058743476 title "Relationship between the Continually Expanded Interlayer Distance of Layered Silicates and Excess Intercalation of Cationic Surfactants" @default.
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- W2058743476 doi "https://doi.org/10.1021/la030056h" @default.
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