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Unusual Interfacial Freezing Phenomena in Hexacontane/Silica Composites
Gao, Xia1,2; Su, Yunlan1,2; Zhao, Weiwei1,2; Qian, Qingyun3; Chen, Xin3; Wittenbrink, Robert3; Wang, Dujin1,2
AbstractThe crystallization behaviors of n-hexacontane (C60H122)/Stober silica (SiO2) composites with various compositions were investigated by a combination of differential scanning calorimetry (DSC), solid-state C-13 nuclear magnetic resonance (solid-state C-13 NMR), and proton NMR. relaxation experiments. By means of DSC, C60H122 molecules in C60H122/silica composites were observed to be involved in the interfacial freezing not present in the free bulk C60H122 The orientation of C60H122 molecules, being preferentially normal to silica surface, was confirmed by grazing incidence X-ray diffraction experiments on thin n-hexacontane film adsorbed on the silicon wafer with a native SiO2 layer. Inferred from the solid C-13 NMR data, the interfacial monolayer is in orthorhombic phase with certain chain disorders. It is speculated that the "interfacial freezing" of C60H122 formed in the presence of silica particles is driven by the combination of the strong, attraction between the molecules and the enhanced number of interfacial molecules on the silica surface.
Indexed BySCI
Document Type期刊论文
Affiliation1.Chinese Acad Sci, Beijing Natl Lab Mol Sci, Key Lab Engn Plast, Inst Chem, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.ExxonMobil Asia Pacific Res & Dev Co Ltd, 1099 Zixing Rd, Shanghai 200241, Peoples R China
Recommended Citation
GB/T 7714
Gao, Xia,Su, Yunlan,Zhao, Weiwei,et al. Unusual Interfacial Freezing Phenomena in Hexacontane/Silica Composites[J]. JOURNAL OF PHYSICAL CHEMISTRY B,2017,121(27):6659-6666.
APA Gao, Xia.,Su, Yunlan.,Zhao, Weiwei.,Qian, Qingyun.,Chen, Xin.,...&Wang, Dujin.(2017).Unusual Interfacial Freezing Phenomena in Hexacontane/Silica Composites.JOURNAL OF PHYSICAL CHEMISTRY B,121(27),6659-6666.
MLA Gao, Xia,et al."Unusual Interfacial Freezing Phenomena in Hexacontane/Silica Composites".JOURNAL OF PHYSICAL CHEMISTRY B 121.27(2017):6659-6666.
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