Monodisperse Magnetic Silica Hexapods

Jae Hyun Kim, Hye Jeong Hwang, Joon Suk Oh, Stefano Sacanna, Gi Ra Yi

Research output: Contribution to journalArticle

Abstract

A simple yet versatile solution-based process to produce colloidal silica hexapods is developed in which various shapes of silica rods are grown on the faces of cubes in a controlled manner. In the presence of hematite cubic particles, water droplets nucleate on the surface of hematite by phase separation in pentanol. By adjusting the water concentration, six droplets can form on each face of the hematite cube. A silica precursor is then administered into the system, which gradually diffuses into the water droplets through the oil phase. Within the droplets, hydrolysis and condensation of the precursors take place, leading to formation of silica rods. As a result, silica hexapods on a magnetic hematite cubic seed are produced. Furthermore, when the emulsions are aged at 60 °C prior to the silica growth, the water content in the solution decreases gradually due to evaporation and spiky sharp hexapods are produced. On the other hand, when organosilane precursor is added, pancake-like hexapods are formed due to the reduction of interfacial tension. These colloidal hexapods can further be utilized as new building blocks for self-assembly to construct functional materials or as a model system to understand collective behaviors.

Original languageEnglish (US)
Pages (from-to)9230-9235
Number of pages6
JournalJournal of the American Chemical Society
Volume140
Issue number29
DOIs
StatePublished - Jul 25 2018

Fingerprint

Silicon Dioxide
Hematite
Silica
Water
Pentanols
Surface Tension
Functional materials
Emulsions
Phase separation
Self assembly
Water content
Surface tension
Seed
Condensation
Hydrolysis
Seeds
Oils
Evaporation
ferric oxide
Growth

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this

Monodisperse Magnetic Silica Hexapods. / Kim, Jae Hyun; Hwang, Hye Jeong; Oh, Joon Suk; Sacanna, Stefano; Yi, Gi Ra.

In: Journal of the American Chemical Society, Vol. 140, No. 29, 25.07.2018, p. 9230-9235.

Research output: Contribution to journalArticle

Kim, Jae Hyun ; Hwang, Hye Jeong ; Oh, Joon Suk ; Sacanna, Stefano ; Yi, Gi Ra. / Monodisperse Magnetic Silica Hexapods. In: Journal of the American Chemical Society. 2018 ; Vol. 140, No. 29. pp. 9230-9235.
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