Dendritic silica nanoparticles synthesized by a block copolymer-directed seed-regrowth approach

Junzheng Wang, Ayae Sugawara-Narutaki, Atsushi Shimojima, Minoru Osada, Renzhi Ma, Tatsuya Okubo

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

A facile seed regrowth method is presented for the preparation of a new type of colloidal dendritic silica nanoparticles (DSNPs) with unique Konpeito-like morphology and high surface area (â4400 m2 g-1). Growth of silica nanoprotrusions on the surfaces of colloidal silica nanoparticles proceeds by hydrolysis and polycondensation of tetraethoxysilane (TEOS) in the presence of a PEO-PPO-PEO-type block copolymer (Pluronic F127) under controlled pH conditions. The polymers adsorbed on the seed surface play a crucial role in the formation of DSNPs. DSNPs with controllable size (28-85 nm) and narrow size distributions can be obtained by using monodisperse silica nanoparticles with various sizes as seeds. The surface morphology of DSNPs is tunable by changing the concentration of TEOS. Additionally, novel dendritic silica nanochains are prepared using one-dimensionally assembled silica nanoparticles as the seeds.

Original languageEnglish
Pages (from-to)1610-1614
Number of pages5
JournalLangmuir
Volume31
Issue number5
DOIs
Publication statusPublished - 2015 Feb 10

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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