Vibrational properties of quasi-two-dimensional colloidal glasses with varying interparticle attraction
| Autor: | Zoey S. Davidson, Piotr Habdas, Matthew Gratale, Tim Still, Xiaoguang Ma, Arjun G. Yodh |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Condensed matter physics Interaction strength 01 natural sciences Attraction Measure (mathematics) 010305 fluids & plasmas Condensed Matter::Soft Condensed Matter Colloid Colloidal particle Particle dynamics Molecular vibration 0103 physical sciences Particle 010306 general physics |
| Zdroj: | Physical review. E. 94(4-1) |
| ISSN: | 2470-0053 |
| Popis: | We measure the vibrational modes and particle dynamics of quasi-two-dimensional colloidal glasses as a function of interparticle interaction strength. The interparticle attractions are controlled via a temperature-tunable depletion interaction. Specifically, the interparticle attraction energy is increased gradually from a very small value (nearly hard-sphere) to moderate strength (∼4k_{B}T), and the variation of colloidal particle dynamics and vibrations are concurrently probed. The particle dynamics slow monotonically with increasing attraction strength, and the particle motions saturate for strengths greater than ∼2k_{B}T, i.e., as the system evolves from a nearly repulsive glass to an attractive glass. The shape of the phonon density of states is revealed to change with increasing attraction strength, and the number of low-frequency modes exhibits a crossover for glasses with weak compared to strong interparticle attraction at a threshold of ∼2k_{B}T. This variation in the properties of the low-frequency vibrational modes suggests a new means for distinguishing between repulsive and attractive glass states. |
| Databáze: | OpenAIRE |
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