Issue 19, 2014

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

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.

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

Supplementary files

Article information

Article type
Paper
Submitted
03 Feb 2014
Accepted
13 Mar 2014
First published
14 Mar 2014

Phys. Chem. Chem. Phys., 2014,16, 8921-8926

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

S. Wu, G. Zhu, J. S. Zhang, D. Banerjee, J. D. Bass, C. Ling and K. Yano, Phys. Chem. Chem. Phys., 2014, 16, 8921 DOI: 10.1039/C4CP00498A

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