Vibrational and structural signatures of the crossover between dense glassy and sparse gel-like attractive colloidal packings

M.A. Lohr, T. Still, R. Ganti, M.D. Gratale, Z.S. Davidson, K.B. Aptowicz, C.P. Goodrich, D.M. Sussman, A.G. Yodh, Physical Review E 90 (2014) 062305.

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Journal Article | Published | English
Author
Lohr, Matthew A.; Still, Tim; Ganti, Raman; Gratale, Matthew D.; Davidson, Zoey S.; Aptowicz, Kevin B.; Goodrich, Carl PeterIST Austria ; Sussman, Daniel M.; Yodh, A. G.
Abstract
We investigate the vibrational modes of quasi-two-dimensional disordered colloidal packings of hard colloidal spheres with short-range attractions as a function of packing fraction. Certain properties of the vibrational density of states (vDOS) are shown to correlate with the density and structure of the samples (i.e., in sparsely versus densely packed samples). Specifically, a crossover from dense glassy to sparse gel-like states is suggested by an excess of phonon modes at low frequency and by a variation in the slope of the vDOS with frequency at low frequency. This change in phonon mode distribution is demonstrated to arise largely from localized vibrations that involve individual and/or small clusters of particles with few local bonds. Conventional order parameters and void statistics did not exhibit obvious gel-glass signatures as a function of volume fraction. These mode behaviors and accompanying structural insights offer a potentially new set of indicators for identification of glass-gel transitions and for assignment of gel-like versus glass-like character to a disordered solid material.
Publishing Year
Date Published
2014-12-05
Journal Title
Physical Review E
Volume
90
Issue
6
Article Number
062305
IST-REx-ID

Cite this

Lohr MA, Still T, Ganti R, et al. Vibrational and structural signatures of the crossover between dense glassy and sparse gel-like attractive colloidal packings. Physical Review E. 2014;90(6):062305. doi:10.1103/physreve.90.062305
Lohr, M. A., Still, T., Ganti, R., Gratale, M. D., Davidson, Z. S., Aptowicz, K. B., … Yodh, A. G. (2014). Vibrational and structural signatures of the crossover between dense glassy and sparse gel-like attractive colloidal packings. Physical Review E, 90(6), 062305. https://doi.org/10.1103/physreve.90.062305
Lohr, Matthew A., Tim Still, Raman Ganti, Matthew D. Gratale, Zoey S. Davidson, Kevin B. Aptowicz, Carl Peter Goodrich, Daniel M. Sussman, and A. G. Yodh. “Vibrational and Structural Signatures of the Crossover between Dense Glassy and Sparse Gel-like Attractive Colloidal Packings.” Physical Review E 90, no. 6 (2014): 062305. https://doi.org/10.1103/physreve.90.062305.
M. A. Lohr et al., “Vibrational and structural signatures of the crossover between dense glassy and sparse gel-like attractive colloidal packings,” Physical Review E, vol. 90, no. 6, p. 062305, 2014.
Lohr MA, Still T, Ganti R, Gratale MD, Davidson ZS, Aptowicz KB, Goodrich CP, Sussman DM, Yodh AG. 2014. Vibrational and structural signatures of the crossover between dense glassy and sparse gel-like attractive colloidal packings. Physical Review E. 90(6), 062305.
Lohr, Matthew A., et al. “Vibrational and Structural Signatures of the Crossover between Dense Glassy and Sparse Gel-like Attractive Colloidal Packings.” Physical Review E, vol. 90, no. 6, American Physical Society, 2014, p. 062305, doi:10.1103/physreve.90.062305.

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