One-step preparation of organosiloxane-derived silica particles

Song Chen, Akiyoshi Osaka, Satoshi Hayakawa, Yuki Shirosaki, Akihiro Matsumoto, Eiji Fujii, Koji Kawabata, Kanji Tsuru

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Silica particles and their derivatives with meso-structure attracted much attention, but they were synthesized through complicated multi-step procedure. Considering biomedical application, no surfactants, used in almost all cases above, should be employable due to fear of their toxicity. The present study explored one-step sol-gel preparation of silica particles with biomedical functionalities, starting from Stöber-type systems, and characterized by Transmission Electron Micrograph or 29Si MAS NMR spectroscopy. The Ca-containing particles, derived from the precursor system tetraethoxysilane (TEOS)-H2O-C2H5OH (EtOH)-CaCl 2-NH4OH, consisted of primary particles of - IO nm, and were spherical in shape with the diameter of - 1000 nm, where Ca bridged Si-O- on the opposite particle surface. In contrast, the Ca-free particles were smaller with 400-500 nm in size due to the absence of such bridging effects. In addition, the Ca-containing ones deposited petal-like apatite within one week in Kokubo's simulated body fluid (SBF), which was interpreted in terms of the Ca release from the particles. Amino-modified silica particles were derived from the sol-gel precursor system aminopropyltriethoxysilane (APTES)-TEOS-H 2O-EtOH where APTES behaved not only as the catalyst but also a reactant; i.e., this was a self-catalyzed sol-gel system. Hydrogen bonding among the amino group of APTES on one particle surface and with Si-O- on the other was suggested to work in agglomeration of the primary particles. Bovine serum albumin was covalently fixed on the APTES-silica surface, suggesting their applicability of proteins or other growth factor delivery.

Original languageEnglish
Title of host publicationAdvances in Bioceramics and Porous Ceramics II - A Collection of Papers Presented at the 33rd International Conference on Advanced Ceramics and Composites
Number of pages13
Publication statusPublished - 2010
EventAdvances in Bioceramics and Porous Ceramics II - 33rd International Conference on Advanced Ceramics and Composites - Daytona Beach, FL, United States
Duration: Jan 18 2009Jan 23 2009

Publication series

NameCeramic Engineering and Science Proceedings
ISSN (Print)0196-6219


OtherAdvances in Bioceramics and Porous Ceramics II - 33rd International Conference on Advanced Ceramics and Composites
Country/TerritoryUnited States
CityDaytona Beach, FL

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry


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