Liquid, glass, gel: The phases of colloidal Laponite

Cummins, H. Z.

doi:10.1016/j.jnoncrysol.2007.02.066

Cited by 209 publications

(218 citation statements)

References 59 publications

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“…The same identical protocol has been strictly followed for the preparation of each sample, fundamental condition to obtain reliable and reproducible results 23 . All our samples after a few minutes reach a constant value of pHC10, as measured in 42,43 . At this pH the rim charges are positive 44 .…”

Section: Discussionsupporting

confidence: 54%

Glass–glass transition during aging of a colloidal clay

et al. 2014

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Colloidal suspensions are characterized by a variety of microscopic interactions, which generate unconventional phase diagrams encompassing fluid, gel and glassy states and offer the possibility to study new phase and/or state transitions. Among these, glass-glass transitions are rare to be found, especially at ambient conditions. Here, through a combination of dilution experiments, X-ray photon correlation spectroscopy, small angle X-ray scattering, rheological measurements and Monte Carlo simulations, we provide evidence of a spontaneous glass-glass transition in a colloidal clay. Two different glassy states are distinguished with evolving waiting time: a first one, dominated by long-range screened Coulombic repulsion (Wigner glass) and a second one, stabilized by orientational attractions (Disconnected House of Cards glass), occurring after a much longer time. These findings may have implications for heterogeneously charged systems out-of-equilibrium and for applications where a fine control of the local order and/or long term stability of the amorphous materials are required.

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Section: Discussionsupporting

confidence: 54%

Glass–glass transition during aging of a colloidal clay

et al. 2014

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“…Similar conclusions regarding the experimental history were reported by Cummins et al 51 in a work on the synthetic smectite laponite. In general memory effects are incorporated in the value of the fractional derivative γ and this has been reported to become more important, the smaller the value of γ 41 .…”

Section: Discussion Sectionsupporting

confidence: 90%

Transições entre estados de hidratação em nanossilicatos sintéticos

Altoé¹

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“…4) 56,57 . For the ultrasmall PVA-coated LAP nanoclay, the behaviour is however less self-evident, as the cationic rim regions can in principle interact with the anionic basal planes to form edge-on-plane structures, also known as 'house of cards' structure 48,58 . Therefore, we carefully analysed the mesoscale order using SEM, TEM and 1D/2D X-ray diffraction (XRD).…”

Section: Strategy and Building Blocks And Structural Characterizationmentioning

confidence: 99%

Nacre-mimetics with synthetic nanoclays up to ultrahigh aspect ratios

et al. 2015

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Nacre-mimetics hold great promise as mechanical high-performance and functional materials. Here we demonstrate large progress of mechanical and functional properties of self-assembled polymer/nanoclay nacre-mimetics by using synthetic nanoclays with aspect ratios covering three orders in magnitude (25-3,500). We establish comprehensive relationships among structure formation, nanostructuration, deformation mechanisms and mechanical properties as a function of nanoclay aspect ratio, and by tuning the viscoelastic properties of the soft phase via hydration. Highly ordered, large-scale nacre-mimetics are obtained even for low aspect ratio nanoplatelets and show pronounced inelastic deformation with very high toughness, while those formed by ultralarge nanoplatelets exhibit superb stiffness and strength, previously only reachable for highly crosslinked materials. Regarding functionalities, we report formerly impossible glass-like transparency, and excellent gas barrier considerably exceeding earlier nacre-mimetics based on natural nanoclay. Our study enables rational design of future high-performance nacre-mimetic materials and opens avenues for ecofriendly, transparent, self-standing and strong advanced barrier materials.

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Liquid, glass, gel: The phases of colloidal Laponite

Cited by 209 publications

References 59 publications

Glass–glass transition during aging of a colloidal clay

Glass–glass transition during aging of a colloidal clay

Transições entre estados de hidratação em nanossilicatos sintéticos

Nacre-mimetics with synthetic nanoclays up to ultrahigh aspect ratios

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