Two fluoroalkyl end-capped vinyltrimethoxysilane oligomer/methyltrimethoxysilane nanocomposites [RF-(VM-SiO3/2)n-RF/MeSiO3/2] were prepared through the acid-base sol-gel reactions of the corresponding fluorinated oligomer [RF-(CH2-CHSi(OMe)3)n-RF: n = 2, 3; RF = CF(CF3)OC3F7: RF-(VM)n-RF] and methyltrimethoxysilane [MeSi(OMe)3: MTMS] under acidic (acetic acid) and successively under alkaline (ammonium carbonate or aqueous ammonia) conditions. FE-SEM (field emission scanning electron micrographs) measurements showed that the RF-(VM-SiO3/2)n-RF/MeSiO3/2 nanocomposites thus obtained consist of clear monolithic structures, affording a lower bulk specific gravity value (~ 0.06 g/cm3) than that (0.49 g/cm3) of the corresponding original RF-(VM-SiO3/2)n-RF oligomeric nanoparticles, which were prepared in the absence of MTMS under similar acid-base sol-gel conditions. Interestingly, the obtained monolithic fluorinated oligomeric silica nanocomposite powders were found to form the corresponding lipogels toward the traditional organic media, such as methanol, ethanol, 2-propanol (IPA), tetrahydrofuran (THF), 1,2-dichloroethane (DE), N,N-dimethylformamide (DMF), and ethyl isopropyl sulfone except for water. It was demonstrated that the RF-(VM-SiO3/2)n-RF/MeSiO3/2 nanocomposite lipogels can provide a superoleophilic/superhydrophobic characteristic on the modified glass surface, although the corresponding RF-(VM-SiO3/2)n-RF oligomeric nanoparticles afforded an oleophobic/superhydrophobic property on the surface. Such unique surface wettability enabled these fluorinated nanocomposite lipogels to apply to not only the packing material for the column chromatography to separate the water-in-oil (W/O) emulsions but also the selective adsorbent for the fluorinated organic aromatic compounds from aqueous methanol solution.

中文翻译：

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具有超亲油/超疏水特性的氟烷基封端乙烯基三甲氧基硅烷低聚物/甲基三甲氧基硅烷纳米复合脂凝胶的简便制备和应用

通过相应的氟化低聚物[RF-(CH2-)的酸碱溶胶-凝胶反应制备了两种氟烷基封端的乙烯基三甲氧基硅烷低聚物/甲基三甲氧基硅烷纳米复合材料[RF-(VM-SiO3/2)n-RF/MeSiO3/2]。 CHSi(OMe)3)n-RF: n = 2, 3; RF = CF(CF3)OC3F7: RF-(VM)n-RF] 和甲基三甲氧基硅烷 [MeSi(OMe)3: MTMS] 在酸性（乙酸）和碱性（碳酸铵或氨水）条件下依次进行。FE-SEM（场发射扫描电子显微照片）测量表明，由此获得的 RF-(VM-SiO3/2)n-RF/MeSiO3/2 纳米复合材料由清晰的整体结构组成，具有较低的体积比重值（~0.06 g /cm3) 比相应的原始 RF-(VM-SiO3/2)n-RF 低聚纳米粒子 (0.49 g/cm3) 它们是在没有 MTMS 的情况下在类似的酸碱溶胶凝胶条件下制备的。有趣的是，发现获得的整体氟化低聚二氧化硅纳米复合粉末形成了针对传统有机介质的相应脂凝胶，如甲醇、乙醇、2-丙醇（IPA）、四氢呋喃（THF）、1,2-二氯乙烷（DE）、 N,N-二甲基甲酰胺 (DMF) 和乙基异丙基砜（水除外）。结果表明，RF-(VM-SiO3/2)n-RF/MeSiO3/2 纳米复合脂凝胶可以在改性玻璃表面提供超亲油/超疏水特性，尽管相应的 RF-(VM-SiO3/2)n- RF 低聚纳米粒子在表面上提供了疏油/超疏水特性。