Dendritic, nanosized building block for Siloxane-based materials

A spherosilicate dendrimer

Kazufumi Kawahara, Yoshiaki Hagiwara, Kazuyuki Kuroda

    Research output: Contribution to journalArticle

    14 Citations (Scopus)

    Abstract

    A spherosilicate dendrimer (DMS-1) with closely spaced reaction sites (Si-H groups) on the dendrimer surface has been synthesized by stepwise silylation of double-four-ring silicate with chlorotriethoxysilane (ClSi(OEt)3) and subsequently with chlorodimethylsilane (ClSiHMe2). DMS-1 consists of a maximum of 40 Si atoms in the interior frameworks and 24 reactive Si-H groups on the surface. Because DMS-1 is spherical and about 1.5 nm in diameter, it can be regarded as the smallest well-defined silica-based nanoparticle. DMS-1 also forms molecular crystals and is soluble in typical organic solvents. A molecularly ordered silica-based hybrid can be prepared by heating a cast film of DMS-1 at 180 °C for 5 days. The surface of DMS-1 can be modified by hydrosilylation with 1-hexadecene, triethoxyvinylsilane, and allylic-terminated tetraethylene glycol monomethyl ether. More than 20 Si-H groups out of 24 react with these reagents. The solubilities of the products depend on the modification. DMS-1 is not only a building block for nanohybrids, but also the smallest and most precisely designed siloxane-based nanoparticle.

    Original languageEnglish
    Pages (from-to)13188-13196
    Number of pages9
    JournalChemistry - A European Journal
    Volume17
    Issue number47
    DOIs
    Publication statusPublished - 2011 Nov 18

    Fingerprint

    Siloxanes
    Dendrimers
    Silicon Dioxide
    Silica
    Nanoparticles
    Molecular crystals
    Hydrosilylation
    Silicates
    Glycols
    Ether
    Organic solvents
    Ethers
    Solubility
    Heating
    Atoms

    Keywords

    • dendrimers
    • nanoparticles
    • organic-inorganic hybrid composites
    • silanes
    • silicates

    ASJC Scopus subject areas

    • Chemistry(all)

    Cite this

    Dendritic, nanosized building block for Siloxane-based materials : A spherosilicate dendrimer. / Kawahara, Kazufumi; Hagiwara, Yoshiaki; Kuroda, Kazuyuki.

    In: Chemistry - A European Journal, Vol. 17, No. 47, 18.11.2011, p. 13188-13196.

    Research output: Contribution to journalArticle

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