, Volume 45, Issue 1, pp 117
First online:
Diffusing wave spectroscopy of dense colloids: Liquid, crystal and glassy states
 Subrata SanyalAffiliated withDepartment of Physics, Indian Institute of Science
 , Ajay K SoodAffiliated withDepartment of Physics, Indian Institute of ScienceJawaharlal Nehru Centre for Advanced Scientific Research
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Using intensity autocorrelation of multiply scattered light, we show that the increase in interparticle interaction in dense, binary colloidal fluid mixtures of particle diameters 0.115µm and 0.089µm results in freezing into a crystalline phase at volume fractionφ of 0.1 and into a glassy state atφ=0.2. The functional form of the field autocorrelation functiong ^{(1)}(t) for the binary fluid phase is fitted to exp[−γ(6k _{0} ^{2} D _{eff} t)^{1/2}] wherek _{0} is the magnitude of the incident light wavevector andγ is a parameter inversely proportional to the photon transport mean free pathl*. TheD _{eff} is thel* weighted average of the individual diffusion coefficients of the pure species. Thel* used in calculatingD _{eff} was computed using the Mie theory. In the solid (crystal or glass) phase, theg ^{(1)}(t) is fitted (only with a moderate success) to exp[−γ(6k _{0} ^{2} W(t))^{1/2}] where the meansquared displacementW(t) is evaluated for a harmonically bound overdamped Brownian oscillator. It is found that the fitted parameterγ for both the binary and monodisperse suspensions decreases significantly with the increase of interparticle interactions. This has been justified by showing that the calculated values ofl* in a monodisperse suspension using Mie theory increase very significantly with the interactions incorporated inl* via the static structure factor.
Keywords
Colloids dynamic light scattering crystal and glass transitionsPACS Nos
82.70 64.70 42.20 05.40 Title
 Diffusing wave spectroscopy of dense colloids: Liquid, crystal and glassy states
 Journal

Pramana
Volume 45, Issue 1 , pp 117
 Cover Date
 199507
 DOI
 10.1007/BF02848093
 Print ISSN
 03044289
 Online ISSN
 09737111
 Publisher
 Springer India
 Additional Links
 Topics
 Keywords

 Colloids
 dynamic light scattering
 crystal and glass transitions
 82.70
 64.70
 42.20
 05.40
 Industry Sectors
 Authors

 Subrata Sanyal ^{(1)}
 Ajay K Sood ^{(1)} ^{(3)}
 Author Affiliations

 1. Department of Physics, Indian Institute of Science, 560 012, Bangalore, India
 3. Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur Campus, P O Jakkur, 560 064, Bangalore, India