An experimental study of aqueous suspensions containing dissolved polymer

Patel, Prakash D.; Russel, William B.

doi:10.1016/0021-9797(89)90158-6

Cited by 67 publications

(23 citation statements)

References 18 publications

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“…Based on this suggested interpretation of the MCT nonergodicity transitions, several features of the computed HCAY density-temperature diagrams agree qualitatively with experimental observations made on colloid-polymer mixtures and sterically stabilized suspensions [6][7][8][9][10][11][12][13][14]16,17]. First, the gel transitions appear to lie at lower temperatures than, but otherwise track, the freezing line when present.…”

Section: Discussionsupporting

confidence: 83%

“…It is by now well established that when the range of the colloidal attraction is decreased the phase diagram undergoes a progression from gas-liquid-solid to fluid-solid coexistence, the latter with a subcooled critical point which is metastable with respect to fluid-solid coexistence [1][2][3][4][5]. Numerous experimental studies show that suspensions often form incompletely equilibrated solids with the appearance of gels where one expects a fluid-solid [6][7][8][9][10][11][12][13][14] or gas-liquid [15] phase separation from equilibrium theory. The systems studied include mixtures of colloids and non-adsorbing polymer [6][7][8][9][10][11] and sterically stabilized colloids in marginal solvents [12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

“…Numerous experimental studies show that suspensions often form incompletely equilibrated solids with the appearance of gels where one expects a fluid-solid [6][7][8][9][10][11][12][13][14] or gas-liquid [15] phase separation from equilibrium theory. The systems studied include mixtures of colloids and non-adsorbing polymer [6][7][8][9][10][11] and sterically stabilized colloids in marginal solvents [12][13][14][15][16][17]. In the former case, the attractions stem from depletion of the polymer coils from the regions between closely spaced particles [18,19], and in the latter they are caused by surface grafted chain-chain interactions [20].…”

Section: Introductionmentioning

confidence: 99%

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Nonergodicity transitions in colloidal suspensions with attractive interactions

1999

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The colloidal gel and glass transitions are investigated using the idealized mode coupling theory (MCT) for model systems characterized by short-range attractive interactions. Results are presented for the adhesive hard sphere and hard core attractive Yukawa systems. According to MCT, the former system shows a critical glass transition concentration that increases significantly with introduction of a weak attraction. For the latter attractive Yukawa system, MCT predicts low temperature nonergodic states that extend to the critical and subcritical region. Several features of the MCT nonergodicity transition in this system agree qualitatively with experimental observations on the colloidal gel transition, suggesting that the gel transition is caused by a low temperature extension of the glass transition. The range of the attraction is shown to govern the way the glass transition line traverses the phase diagram relative to the critical point, analogous to findings for the fluid-solid freezing transition.

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Section: Discussionsupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nonergodicity transitions in colloidal suspensions with attractive interactions

1999

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“…Mixtures of colloidal hard spheres and non-adsorbing polymer show interesting phase behavior, as several experimental studies have revealed [1][2][3][4][5][6][7][8][9][10][11][12][13]. The starting point for theoretical models describing this phase behavior is the notion that the polymers are excluded from a depletion zone surrounding the particles, since they cannot penetrate the colloidal spheres [14,15].…”

Section: Introductionmentioning

confidence: 99%

Fluid-fluid phase separation in colloid-polymer mixtures studied with small angle light scattering and light microscopy

Verhaegh

Duijneveldt

Dhont

et al. 1996

Physica A: Statistical Mechanics and its Applications

104

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Mixtures of colloidal silica spheres and polydimethylsiloxane in cyclohexane with a colloid-polymer size ratio of about one were found to phase separate into two fluid phases, one which is colloid-rich and one which is colloid-poor. In this work the phase separation kinetics of this fluid-fluid phase separation is studied for different compositions of the colloid-polymer mixtures, and at several degrees of supersaturation, with small angle light scattering and with light microscopy. The small angle light scattering curve exhibits a peak that grows in intensity and that shifts to smaller wave vector with time. The characteristic length scale that is obtained from the scattering peak is of the order of a few p.m, in agreement with observations by light microscopy. The domain size increases with time as t 1/3, which might be an indication of coarsening by diffusion and coalescence, like in the case of binary liquid mixtures and polymer blends. For sufficiently low degrees of supersaturation the angular scattering intensity curves satisfy dynamical scaling behavior.

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“…The nature of the coexisting phases depends on the size ratio of the polymers and the colloids [3]. For size ratios larger than R e /r c = 0.3 (R e is the radius of gyration of the polymer and r c is the radius of the colloid) and moderate colloidal volume fractions one finds coexistence between a colloidal-gas and a colloidal-liquid phase as is predicted by the theory [3][4][5] and confirmed by experiments [3,4,[6][7][8].…”

Section: Introductionmentioning

confidence: 65%