Preparation and properties of fluorinated carboxylic acid/silica nanocomposite-encapsulated low molecular weight compounds
Sumino, E; Ise, S; Saito, T; Nishida, M; Noguchi, T; Sawada, H
| HERO ID | 3859950 |
|---|---|
| In Press | No |
| Year | 2014 |
| Title | Preparation and properties of fluorinated carboxylic acid/silica nanocomposite-encapsulated low molecular weight compounds |
| Authors | Sumino, E; Ise, S; Saito, T; Nishida, M; Noguchi, T; Sawada, H |
| Journal | Colloid and Polymer Science |
| Volume | 292 |
| Issue | 2 |
| Page Numbers | 369-379 |
| Abstract | Perfluoro-2-methyl-3-oxahexanoic acid/silica nanocomposites [R-F-CO2H/SiO2] were prepared by the sol-gel reaction of tetraethoxysilane in the presence of silica nanoparticles and the corresponding fluorinated carboxylic acid under alkaline conditions. R-F-CO2H/SiO2 nanocomposites were found to exhibit no weight loss in proportion to the contents of fluorinated carboxylic acid in the composites even after calcination at 800 A degrees C. The modified glass surface treated with the R-F-CO2H/SiO2 nanocomposites was shown to give a good oleophobicity with superhydrophilicity imparted by fluorinated carboxylic acid in the composites. R-F-CO2H/SiO2 nanocomposites were also applied to the encapsulation of a variety of low molecular weight aromatic and aliphatic compounds such as bisphenol AF [BPAF], bisphenol A [BPA], 4,4'-biphenol [BPOH], octafluoro-4,4'-biphenol [FBPOH], 4,4'-bis(triethoxysilyl)-1,1'-biphenyl [BTSBP], 3-(trihydroxysilyl)propane-1-sulfonic acid [THSP], alpha-cyclodextrin (alpha-CD), beta-cyclodextrin (beta-CD), and gamma-cyclodextrin (gamma-CD). Encapsulated aromatic compounds possessing acidic hydroxyl groups such as BPAF, BPA, and FBPOH in the R-F-COOH/SiO2 nanocomposites were found to exhibit no weight loss corresponding to the contents of aromatic compounds in the composites even after calcination at 800 A degrees C. On the other hand, encapsulated aromatic compounds possessing no acidic hydroxyl groups such as BTSBP and aliphatic compounds (THSP, alpha-, beta-, and gamma-CD) gave a clear weight loss corresponding to the contents of these compounds in the composites after calcination. In addition, the fluorinated silica nanocomposite-encapsulated these compounds were applied to the surface modification of glass to exhibit a good oleophobicity with superhydrophilicity imparted by fluorinated carboxylic acid on the surface. |
| Doi | 10.1007/s00396-013-3078-7 |
| Wosid | WOS:000331207200009 |
| Is Certified Translation | No |
| Dupe Override | No |
| Is Public | Yes |
| Keyword | Fluorinated carboxylic acid; Silica nanocomposite; Low molecular weight aromatic and aliphatic compound; Nonflammability; H-1 MAS NMR; UV-vis spectra |