Distinct elastic properties and their origins in glasses and gels

Wang, Yinqiao; Tateno, Michio; Tanaka, Hajime

doi:10.1038/s41567-024-02456-6

Nat. Phys.

2024

DOI: 10.1038/s41567-024-02456-6

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Distinct elastic properties and their origins in glasses and gels

Yinqiao Wang,

Michio Tateno,

Hajime Tanaka

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Cited by 3 publications

References 62 publications

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Polymer gels for aqueous metal batteries

Zhang,

Wang,

Wang

et al. 2025

Progress in Materials Science

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Polymer gels for aqueous metal batteries

Zhang,

Wang,

Wang

et al. 2025

Progress in Materials Science

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Formation dynamics of branching structure in the slippery DLCA model

Hirata,

Araki

2024

The Journal of Chemical Physics

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We numerically investigated the aggregation dynamics and resulting network structures of colloidal gels using the slippery diffusion-limited cluster aggregation (DLCA) model. In this model, bonds are irreversibly formed upon the particle contacts, but the angles among them are not fixed, unlike the conventional DLCA. This allows clusters to be deformed in the process of aggregation. By characterizing the aggregation dynamics and using a reduced network scheme, our simulation revealed two distinct branching structure formation routes depending on the particle volume fraction ϕ. In lower volume fraction systems (ϕ ≤ 8%), the deformations of small-size clusters proceed prior to the percolation. When the Maxwell criterion is satisfied and the clusters become mechanically stable, the formation of the branching structure is nearly completed. After forming the branching structures, they aggregate and form a larger percolating network. Then, the aggregation proceeds through the elongation and straightening of the chain parts of the network. In higher volume fraction systems (ϕ > 8%), on the other hand, the clusters percolate, and a fine and homogeneous branching structure is formed at the early stage of the aggregation. In the aging stage, it collapses into a denser and more heterogeneous structure and becomes more stable. Our quantitative analyses of the branching structure will shed light on a new strategy for describing the network formation and elasticity of colloidal gels.

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Filled colloidal gel rheology: Strengthening, stiffening, and tunability

Jiang,

Cui,

et al. 2025

Journal of Rheology

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Filler-induced strengthening is ubiquitous in materials science and is particularly well-established in polymeric nanocomposites. Despite having similar constituents, colloidal gels with solid filling exhibit distinct rheology, which is of practical interest to industry (e.g., lithium-ion batteries) yet remains poorly understood. We show, using experiments and simulations, that filling monotonically enhances the yield stress (i.e., strength) of colloidal gels while the elastic modulus (i.e., stiffness) first increases and then decreases. The latter softening effect results from a frustrated gel matrix at dense filling, evidenced by a growing interphase pressure. This structural frustration is, however, not detrimental to yielding resistance. Instead, fillers offer additional mechanical support to the gel backbone via percolating force chains, decreasing the yield strain at the same time. We develop a mechanistic picture of this phenomenology that leads us to a novel “filler-removal protocol,” making possible individual control over the strength and brittleness of a composite gel.

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Distinct elastic properties and their origins in glasses and gels

Cited by 3 publications

References 62 publications

Polymer gels for aqueous metal batteries

Polymer gels for aqueous metal batteries

Formation dynamics of branching structure in the slippery DLCA model

Filled colloidal gel rheology: Strengthening, stiffening, and tunability

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