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

15 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

Keywords

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

ASJC Scopus subject areas

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

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