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Issue 27, 2019
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Concentration dependence of the dynamics of microgel suspensions investigated by dynamic light scattering

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Abstract

The dynamics of colloidal gel particle suspensions, i.e., microgel suspensions, has been investigated by dynamic light scattering (DLS) over a wide concentration range from the (I) dilute (φ < φcp) to the (II) intermediate (φφcp) and (III) high concentration regions (φφcp), where φ and φcp are the volume fraction of the gel particles in the suspension and the random close packing fraction, φcp ≈ 0.64, respectively. The time–intensity correlation function exhibited a distinct change with increasing φ, i.e., from ergodic behaviour (region I and II) to nonergodic behaviour (region III). A mode transition from translational (region I) to cooperative diffusion (the so-called gel mode) (region II) was also observed due to the soft and deformable nature of the microgels. Different from the dynamics of hard colloidal glass suspensions, the gel mode remained even at φφcp. By using the ensemble-averaged time–correlation function, 〈IE, we quantify the relationship between φ and their dynamics, and show that the soft microgels are deswollen in the densely packed state.

Graphical abstract: Concentration dependence of the dynamics of microgel suspensions investigated by dynamic light scattering

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Publication details

The article was received on 23 May 2019, accepted on 06 Jun 2019 and first published on 07 Jun 2019


Article type: Paper
DOI: 10.1039/C9SM01030K
Soft Matter, 2019,15, 5390-5399

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    Concentration dependence of the dynamics of microgel suspensions investigated by dynamic light scattering

    T. Kureha, H. Minato, D. Suzuki, K. Urayama and M. Shibayama, Soft Matter, 2019, 15, 5390
    DOI: 10.1039/C9SM01030K

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