More on the Phase Diagram of Laponite

Ruzicka, Barbara; Zulian, Laura; Ruocco, G.

doi:10.1021/la0524418

Cited by 133 publications

(160 citation statements)

References 23 publications

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“…Ten Brinke et al 90 found the sol-gel transition for hectorite was lower at $1.5 wt%. Mourchid et al [91][92][93][94] and other workers 22,95,96 found very similar state diagrams for Laponite RD, with the sol-repulsive gel transition at $0.5 wt%. In all these cases the gel transition occurs at a concentration at which the effective hydrodynamic volumes of the particles, extended by the range of the electrical double layer, begin to overlap.…”

Section: Sol-gel Transitionsmentioning

confidence: 66%

Smectite clay – inorganic nanoparticle mixed suspensions: phase behaviour and rheology

2015

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Smectite clay minerals and their suspensions have long been of both great scientific and applications interest and continue to display a remarkable range of new and interesting behaviour. Recently there has been an increasing interest in the properties of mixed suspensions of such clays with nanoparticles of different size, shape and charge. This review aims to summarize the current status of research in this area focusing on phase behaviour and rheological properties. We will emphasize the rich range of data that has emerged for these systems and the challenges they present for future investigations. The review starts with a brief overview of the behaviour and current understanding of pure smectite clays and their suspensions. We then cover the work on smectite clay-inorganic nanoparticle mixed suspensions according to the shape and charge of the nanoparticles -spheres, rods and plates either positively or negatively charged. We conclude with a summary of the overarching trends that emerge from these studies and indicate where gaps in our understanding need further research for better understanding the underlying chemistry and physics.

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Section: Sol-gel Transitionsmentioning

confidence: 66%

Smectite clay – inorganic nanoparticle mixed suspensions: phase behaviour and rheology

2015

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“…%, and depending on the ionic strength, Laponite suspensions evolve from a low-viscosity liquid to various solid-like "arrested" states. The sol-gel transition in Laponite has been investigated mostly using light scattering [27,28,29,30,31]. The ageing properties of Laponite have triggered lots of effort and debate about the exact nature of these nonergodic states, in particular, about whether the material is actually a "gel" or a (Wigner) "glass" [30,32,33,34,35,36,37,38].…”

Section: Structure and Rheology Of Laponite Suspensionsmentioning

confidence: 99%

Shear-induced fragmentation of laponite suspensions

et al. 2009

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Simultaneous rheological and velocity profile measurements are performed in a smooth Couette geometry on Laponite suspensions seeded with glass microspheres and undergoing the shear-induced solid-to-fluid (or yielding) transition. Under these slippery boundary conditions, a rich temporal behaviour is uncovered, in which shear localization is observed at short times, that rapidly gives way to a highly heterogeneous flow characterized by intermittent switching from plug-like flow to linear velocity profiles. Such a temporal behaviour is linked to the fragmentation of the initially solid sample into blocks separated by fluidized regions. These solid pieces get progressively eroded over time scales ranging from a few minutes to several hours depending on the applied shear ratė γ. The steady-state is characterized by a homogeneous flow with almost negligible wall slip. The characteristic time scale for erosion is shown to diverge below some critical shear rateγ ⋆ and to scale as (γ −γ ⋆ ) −n with n ≃ 2 aboveγ ⋆ . A tentative model for erosion is discussed together with open questions raised by the present results.

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“…Numerous investigations have been addressed to define the state diagram of aqueous Laponite dispersions in the ionic strength vs clay concentration plane, i.e. to individuate the different regions of isotropic liquids, disordered (gels and glasses), ordered (nematic phases), flocculated states (Cummins, 2007;Gabriel, Sanchez, & Davidson, 1996;Jabbari-Farouji, Tanaka, Wegdam, & Bonn, 2008;Levitz, Lécolier, Mourchid, Delville, & Lyonnard, 2000;Mourchid, Lécolier, Van Damme, & Levitz, 1998;Mourchid, Delville, Lambard, Lécolier, & Levitz, 1995;Mongondry, Tassin, & Nicolai, 2005;Ruzicka, Zulian, & Ruocco, 2004;Ruzicka, Zulian, & Ruocco, 2006;Tanaka, Meunier, & Bonn, 2004;Tanaka, Jabbari-Farouji, Meunier, & Bonn, 2005). The various contradictions emerging from the comparison of the proposed Laponite dispersion state diagrams are partly apparent and can be mainly ascribed to different aging times and, secondarily, to different protocols of samples preparation or Laponite type .…”

Section: Introductionmentioning

confidence: 99%

Rheology of Laponite-scleroglucan hydrogels

Lapasin

Abrami

Grassi

et al. 2017

Carbohydrate Polymers

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a b s t r a c tBoth Laponite and scleroglucan can find several applications in various fields (from industrial to biomedical one) in virtue of their peculiar features and rheological properties displayed in aqueous phases. Structural states of Laponite dispersions strongly depend on concentration and ionic strength. When attractive and repulsive interparticle interactions are so effective that they lead to arrested states (attractive gel or repulsive glass), the rheological behavior of the dispersion undergoes a sharp transition, from quasi-Newtonian to markedly shear thinning and viscoelastic. Conversely, scleroglucan solutions gradually change to weak gels with increasing polymer concentration. The present work is concerned with aqueous Laponite-scleroglucan mixed systems, obtained according to different preparation modes, and is aimed at examining how much the content and proportion of both components affect the viscoelastic and flow properties of the mixed system.

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More on the Phase Diagram of Laponite

Cited by 133 publications

References 23 publications

Smectite clay – inorganic nanoparticle mixed suspensions: phase behaviour and rheology

Smectite clay – inorganic nanoparticle mixed suspensions: phase behaviour and rheology

Shear-induced fragmentation of laponite suspensions

Rheology of Laponite-scleroglucan hydrogels

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