Anisotropic lattice expansion of three-dimensional colloidal crystals and its impact on hypersonic phonon band gaps

Songtao Wu, Gaohua Zhu, Jin S. Zhang, Debasish Banerjee, Jay D. Bass, Chen Ling, Kazuhisa Yano

Research output: Contribution to journalArticle

Abstract

We report anisotropic expansion of self-assembled colloidal polystyrene-poly(dimethylsiloxane) crystals and its impact on the phonon band structure at hypersonic frequencies. The structural expansion was achieved by a multistep infiltration-polymerization process. Such a process expands the interplanar lattice distance 17% after 8 cycles whereas the in-plane distance remains unaffected. The variation of hypersonic phonon band structure induced by the anisotropic lattice expansion was recorded by Brillouin measurements. In the sample before expansion, a phononic band gap between 3.7 and 4.4 GHz is observed; after 17% structural expansion, the gap is shifted to a lower frequency between 3.5 and 4.0 GHz. This study offers a facile approach to control the macroscopic structure of colloidal crystals with great potential in designing tunable phononic devices. This journal is

Original languageEnglish (US)
Pages (from-to)8921-8926
Number of pages6
JournalPhysical Chemistry Chemical Physics
Volume16
Issue number19
DOIs
StatePublished - May 21 2014

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hypersonics
Hypersonic aerodynamics
Crystal lattices
Energy gap
Crystals
expansion
crystals
Band structure
Polystyrenes
infiltration
Infiltration
polystyrene
polymerization
Polymerization
low frequencies
cycles

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

Anisotropic lattice expansion of three-dimensional colloidal crystals and its impact on hypersonic phonon band gaps. / Wu, Songtao; Zhu, Gaohua; Zhang, Jin S.; Banerjee, Debasish; Bass, Jay D.; Ling, Chen; Yano, Kazuhisa.

In: Physical Chemistry Chemical Physics, Vol. 16, No. 19, 21.05.2014, p. 8921-8926.

Research output: Contribution to journalArticle

Wu, Songtao ; Zhu, Gaohua ; Zhang, Jin S. ; Banerjee, Debasish ; Bass, Jay D. ; Ling, Chen ; Yano, Kazuhisa. / Anisotropic lattice expansion of three-dimensional colloidal crystals and its impact on hypersonic phonon band gaps. In: Physical Chemistry Chemical Physics. 2014 ; Vol. 16, No. 19. pp. 8921-8926.
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