Colloid–polymer mixtures in solution with refractive index matched acrylate colloids

Krämer, Thomas; Scholz, S.; Maskos, Michael; Huber, Klaus

doi:10.1016/j.jcis.2004.06.102

Cited by 16 publications

(28 citation statements)

References 43 publications

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“…Polymer coils, on the other hand, have been predicted to start to collapse in solution upon addition of colloids once the size ratio (R poly g /R C ) enters the PL. 7,10 Inspired by these predictions, Kramer et al 11,12 2 experimentally studied three systems in the PL: polystyrene chains mixed with either octa-n-propylsilsesquioxane (SILS) (R C = 0.7nm), crosslinked poly (ethyl methacrylate) (R C = 8-42 nm), or hydroxyl functionalized silica nanoparticles (R C = 11 nm). Significant (≈50%) coil contraction was found in the presence of high enough (≳8wt%) colloid concentration by means of viscosimetry, light scattering and small angle neutron scattering.…”

Section: Introductionmentioning

confidence: 99%

Conformation and Interactions of Polystyrene and Fullerenes in Dilute to Semidilute Solutions

Dattani¹,

Michels

Nedoma³

et al. 2014

Macromolecules

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We report the polymer conformation and fullerene aggregation in a ternary system containing polystyrene, C 60 and toluene measured by small angle neutron, static and dynamic light scattering. We investigate polymer concentrations across the dilute and semidilute regime for five polymer molecular weights (M w =20k-1Mg/mol), and fullerene concentrations below and above its miscibility threshold in toluene.We find that the polymer radius of gyration (R poly g ), hydrodynamic radius (R h ) * To whom correspondence should be addressed † Centre for Plastic Electronics, Imperial College London, London, SW7 2AZ, United Kingdom ‡ Department of Chemical Engineering, Imperial College London, London, SW7 2AZ, United Kingdom ¶ Physikalische Chemie, Universität Paderborn, 33098 Paderborn, Germany § Institut Laue-Langevin, DS/LSS, F-38 042 Grenoble, France Materials Department, Imperial College London, London, SW7 2AZ, United Kingdom 1 and the mixture correlation length (ξ) remain unchanged upon addition of C 60 .The miscibility of C 60 in toluene, however, decreases upon addition of polystyrene forming aggregates with a time-dependent radius on the order of 100 nm, and this effect is amplified with increasing polymer M w . Our findings are relevant to the solution processing of organic photovoltaics, which generally require the effective solubilisation of fullerene derivatives and polymer pairs in this concentration range.

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Section: Introductionmentioning

confidence: 99%

Conformation and Interactions of Polystyrene and Fullerenes in Dilute to Semidilute Solutions

Dattani¹,

Michels

Nedoma³

et al. 2014

Macromolecules

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“…[1][2][3][4][5][6] for recent reviews, Refs. [7][8][9][10][11][12][13][14][15][16] for experiments, and Refs. for theoretical investigations.…”

Section: Introductionmentioning

confidence: 99%

Fluid–fluid demixing curves for colloid–polymer mixtures in a random colloidal matrix

Annunziata

Pelissetto

2011

Molecular Physics

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We study fluid-fluid phase separation in a colloid-polymer mixture adsorbed in a colloidal porous matrix close to the θ point. For this purpose we consider the Asakura-Oosawa model in the presence of a quenched matrix of colloidal hard spheres. We study the dependence of the demixing curve on the parameters that characterize the quenched matrix, fixing the polymer-to-colloid size ratio to 0.8. We find that, to a large extent, demixing curves depend only on a single parameter f , which represents the volume fraction which is unavailable to the colloids. We perform Monte Carlo simulations for volume fractions f equal to 40% and 70%, finding that the binodal curves in the polymer and colloid packing-fraction plane have a small dependence on disorder. The critical point instead changes significantly: for instance, the colloid packing fraction at criticality increases with increasing f . Finally, we observe for some values of the parameters capillary condensation of the colloids: a bulk colloid-poor phase is in chemical equilibrium with a colloid-rich phase in the matrix. PACS: 61.25. Hq, 82.35.Lr

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“…The choice fell on hydroxy-functionalized silica particles, denoted as OHSil. The system was recently introduced by Mori et al 23 Compared to the two colloid components used in the preceding work, [20][21][22] it provides the following advantages: (i) the OHSil colloids are only slightly larger than the SILS particles, 22 thus still giving rise to values of R g /R c . 1, yet being more like a typical colloid than SILS; (ii) OHSil particles are smaller and less prone to a swelling under good solvent conditions than are PEMA particles.…”

Section: Introductionmentioning

confidence: 99%

Coil Dimensions of Polystyrene Chains in Colloid−Polymer Mixtures at the Protein Limit: A SANS Study

2005

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A new combination of polymer chains and small colloids is presented in order to investigate the behavior of colloid-polymer mixtures in solution (CP) in the protein limit. To this end, hydroxyfunctionalized silica particles (OHSil) were prepared according to a procedure [J. Am. Chem. Soc. 2003, 125, 3712], which led to colloid radii as small as 1.2 nm. Compared to this small size, the coil dimensions of the polystyrene (PS) chains used as the polymer component were larger by more than an order of magnitude. Investigation of the CP focused on the dimension of the PS chains in the presence of a varying amount of OHSil colloids. Chain size and shape were characterized by means of light scattering, viscosity experiments, and small-angle neutron scattering (SANS). Two solvents have been used. A mixture of dimethylformamide (DMF) with toluene was isorefractive to the OHSil particles, giving access to single chain behavior of PS. Pure DMF, on the other hand, allowed an efficient contrast matching of OHSil suitable for SANS experiments on fully deuterated PS. All characterization techniques provided clear evidence for a shrinking of the coil dimensions with increasing OHSil content in the solution. Particle scattering factors from SANS yielded a detailed picture of this chain compaction. The smallest coil dimensions were recorded close to the liquid-liquid phase boundary, occurring at an OHSil volume fraction of ∼0.17. This is considered to be a first experimental evidence for a shift of the liquid-liquid phase boundary toward lower colloid volume fractions if the colloid size increases. Altogether, present data extend earlier measurements on two chemically different CP in the protein limit, thus establishing the observed shrinking to be a universally valid feature of these systems. The results are in qualitative agreement with theoretical predictions.

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Colloid–polymer mixtures in solution with refractive index matched acrylate colloids

Cited by 16 publications

References 43 publications

Conformation and Interactions of Polystyrene and Fullerenes in Dilute to Semidilute Solutions

Conformation and Interactions of Polystyrene and Fullerenes in Dilute to Semidilute Solutions

Fluid–fluid demixing curves for colloid–polymer mixtures in a random colloidal matrix

Coil Dimensions of Polystyrene Chains in Colloid−Polymer Mixtures at the Protein Limit: A SANS Study

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