Long-wavelength transverse modes in charged colloidal crystals

B. V.R. Tata; P. S. Mohanty; M. C. Valsakumar; J. Yamanaka

doi:10.1103/PhysRevLett.93.268303

Long-wavelength transverse modes in charged colloidal crystals

B. V.R. Tata, P. S. Mohanty, M. C. Valsakumar, J. Yamanaka

Research output: Contribution to journal › Article › peer-review

14 Citations (Scopus)

Abstract

The volume fraction dependence of overdamped transverse modes turning propagative in the range of small wave numbers was demonstrated in closely index matched colloidal crystal (CC) of charged silica particles dispersed in ethylene glycol-water (EGW) mixture. The CCs were found to be free from multiple scattering due to close matching of refractive index of the particles with that of medium and were also free from the wall effects due to large size. A dispersion curve for the displacement modes of the blue phase of liquid crystals in the low wave number region was obtained without the hydrodynamic interaction. Experiments suggested a need for a hydrodynamic theory of CCs with polydispersity and anharmonicity.

Original language	English
Article number	268303
Journal	Physical Review Letters
Volume	93
Issue number	26 I
DOIs	https://doi.org/10.1103/PhysRevLett.93.268303
Publication status	Published - 31 Dec 2004
Externally published	Yes

ASJC Scopus subject areas

General Physics and Astronomy

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10.1103/PhysRevLett.93.268303

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AU - Tata, B. V.R.

AU - Mohanty, P. S.

AU - Valsakumar, M. C.

AU - Yamanaka, J.

PY - 2004/12/31

Y1 - 2004/12/31

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AB - The volume fraction dependence of overdamped transverse modes turning propagative in the range of small wave numbers was demonstrated in closely index matched colloidal crystal (CC) of charged silica particles dispersed in ethylene glycol-water (EGW) mixture. The CCs were found to be free from multiple scattering due to close matching of refractive index of the particles with that of medium and were also free from the wall effects due to large size. A dispersion curve for the displacement modes of the blue phase of liquid crystals in the low wave number region was obtained without the hydrodynamic interaction. Experiments suggested a need for a hydrodynamic theory of CCs with polydispersity and anharmonicity.

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VL - 93

JO - Physical Review Letters

JF - Physical Review Letters

IS - 26 I

M1 - 268303

ER -

Long-wavelength transverse modes in charged colloidal crystals

Abstract

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