Preparation of perfluoro-1,3-propanedisulfonic acid/silica nanocomposites-encapsulated low molecular weight aromatic compounds possessing a nonflammable characteristic

• Published in: Journal of colloid and interface science Vol. 356; no. 1; pp. 8 - 15
• Main Authors: Sawada, Hideo, Liu, Xinlai, Goto, Yuki, Kikuchi, Mieko, Tashima, Tsukasa, Nishida, Masakazu
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier Inc 01.04.2011; Elsevier
• Subjects: Aromatic compounds; bisphenol A; Calcination; Chemistry; Colloidal gels. Colloidal sols; Colloidal state and disperse state; Encapsulation; Exact sciences and technology; Fluorescence; Fluorinated silica nanocomposites; General and physical chemistry; high performance liquid chromatography; Low molecular aromatic compounds; molecular weight; Nanocomposites; Nanomaterials; nanoparticles; Nanostructure; Nonflammable characteristic; nuclear magnetic resonance spectroscopy; Parents; Perfluoro-1,3-propanedisulfonic acid; Physical and chemical studies. Granulometry. Electrokinetic phenomena; silica; Silicon dioxide; Spectra; weight loss; Encapsulation; Perfluoro-1,3-propanedisulfonic acid; Nonflammable characteristic; Fluorinated silica nanocomposites; Low molecular aromatic compounds; Binary compound; Nanoparticle; Fluorescence; Fluorine compound; NMR spectrometry; Condensed benzenic compound; Silica; Composite material; Bisphenol A; Acids; Silicon oxides; Sol gel process; Preparation; Aromatic compound; Nanocomposite; Naphthol; Molecular mass
• ISSN: 0021-9797; 1095-7103
• DOI: 10.1016/j.jcis.2010.12.037

PFPS/SiO2/ Ar-H nanocomposites after calcination can exhibit an extremely red-shifted and enhanced fluorescent. [Display omitted] ► Fluorinated disulfonic acid/silica nanocomposites. ► Encapsulation of low molecular weight aromatic compounds. ► Nonflammable characteristic toward aromatic compounds. ► No weight loss behavior after calcination at 800°. Perfluoro-1,3-propanedisulfonic acid/silica [PFPS/SiO 2] nanocomposites were prepared by the sol–gel reactions of the corresponding disulfonic acid [PFPS] with tetraethoxysilane and silica nanoparticles under alkaline conditions. These fluorinated nanocomposites thus obtained can exhibit no weight loss behavior corresponding to the contents of PFPS in the composites after calcination at 800 °C, although the parent PFPS can decompose completely around 270 °C. In addition, we succeeded in encapsulation of a variety of low molecular weight aromatic compounds such as bisphenol-A, bisphenol-AF, bisphenol-F, 4,4′-biphenol and 1,1′-bi-2-naphthol into PFPS/SiO 2 nanocomposite cores. 1H MAS NMR spectra, UV–vis spectra, fluorescence spectra and HPLC measurements of PFPS/SiO 2 nanocomposites-encapsulated bisphenol-A showed the presence of encapsulated bisphenol-A in the composites before and even after calcination at 800 °C. Interestingly, it was verified that fluorescence spectra of PFPS/SiO 2 nanocomposites-encapsulated bisphenol-A after calcination at 800 °C can exhibit an extremely red-shifted and enhanced fluorescence peak, compared to that before calcination or parent bisphenol-A.