Catalytic Sol–Gel Co-Polycondensation of Para-Substituted Phenylsilanes and Bis(silyl)phenylene to Robust Organosilicas Using Colloidal Nickel Nanoparticles
Abstract:The dry sol–gel co-polycondensation at toluene in ambient air atmosphere of p-X-C6H4SiH3 (X = H, CH3, CH3O, F, Cl) and p-H3Si-C6H4SiH3 (9:1 mole ratio) to co-silicas (p-X-C6H4SiO1.5)9(p-O1.5Si-C6H4SiO1.5)1 in high yield, catalyzed by colloidal nickel nanoparticles in-situ generated from nickelocene(II) is described. The co-gels (p-X-C6H4SiO1.5)9(p-O1.5Si-C6H4SiO1.5)1 with higher molecular weights and TGA residue yield were obtained when compared to the homogels p-X-C6H4SiO1.5. Some degree of unreacted Si–H bonds still remained in the gel matrix because of steric bulkiness. All the insoluble gels adopt an amorphous structure with a smooth surface. A plausible mechanism for the dry sol–gel reaction was provided.
Keywords: BIS(CYCLOPENTADIENYL)NICKEL; BIS(SILYL)PHENYLENES; CATALYSIS; CO-GEL; CO-POLYCONDENSATION; COLLOIDAL NICKEL NANOPARTICLE; HOMOGEL; HYDROLYSIS; PARA-SUBSTITUTED PHENYLSILANES; ROBUST ORGANOSILICA; SOL-GEL PROCESS; TGA CERAMIC YIELD
Document Type: Research Article
Publication date: 2010-05-01
- Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
- Editorial Board
- Information for Authors
- Subscribe to this Title
- Terms & Conditions
- Ingenta Connect is not responsible for the content or availability of external websites