Preparation of core-shell mesoporous silica nanoparticles with bimodal pore structures by regrowth method

Hirotaka Ishii, Takaaki Ikuno, Atsushi Shimojima, Tatsuya Okubo

    Research output: Contribution to journalArticle

    14 Citations (Scopus)

    Abstract

    Core-shell structured mesoporous silica nanoparticles (MSNs) with different pore characteristics in the cores and shells have been prepared by the regrowth method. Adding a silica source to a dispersion of presynthesized silica-surfactant composite nanoparticles with two-dimensional hexagonal mesostructures results in regrowth in preference to generation of new particles. Core-shell MSNs with bimodal porosities are easily obtained by adding a pore-expanding agent, 1,3,5-trimethylbenzene, in either the core or shell formation step. Detailed characterization of the core-shell MSNs reveals that the shells consist of disordered arrangements of relatively large or small pores and that the pore sizes in the cores change when the shells formed. Core-shell MSNs will be useful for controlling the release rates of the encapsulated guest molecules and for protecting internal pores from being plugged by other species.

    Original languageEnglish
    Pages (from-to)57-64
    Number of pages8
    JournalJournal of Colloid and Interface Science
    Volume448
    DOIs
    Publication statusPublished - 2015 Jun 5

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    Keywords

    • Core-shell structure
    • Mesoporous silica nanoparticles
    • Pore size control

    ASJC Scopus subject areas

    • Surfaces, Coatings and Films
    • Electronic, Optical and Magnetic Materials
    • Biomaterials
    • Colloid and Surface Chemistry

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