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- W763239736 abstract "In this thesis, we examine the structure and the phase behavior of binary mixtures of soft-colloids in equilibrium. By employing coarse-grained models, we systematically study the properties of soft mixtures and contrast them with those of “hard” colloids. The work is divided in two sections, each considering a particular system. The first part is devoted to the study of the effects of the addition of small linear (chain) polymer to star polymer suspensions. We commence with a coarse-graining approach that allows us to reduce the system complexity and to describe it by means of effective interactions between the central monomer. Thereafter, in a full two-component integral-equation approach we describe the demixing transition in the fluid phase of star/linear polymer mixtures for low and intermediate functionalities and several chain-to-star size ratios. In order to compare the one- and the two-component descriptions, we resort to the depletion interaction. For both hard sphere mixtures and colloid/non-adsorbing polymer mixtures the range of the depletion interaction increases with the size ratio. For the considered system, the range of the depletion potential is insensitive to the size of the depletant polymer. We discuss the physical origin of this and associated effects, as well as a mapping of the mixtures onto a one-component system. Finally, we offer a robust comparison to experimental results, showing the accuracy of the coarse-graining procedure for developing effective interactions between star-like micelles and polymer chains, in a wide range of concentrated mixtures. Without any adjustable parameter we find quantitative agreement between experiments and theory for the influence of the added chains on the inter-micelle structure and on the phase behavior. In the second part, we focus on the so-called GEM particles, representing, e.g., amphiphilic dendrimers or ring polymers in solution. We apply density functional theory to study the interfacial and wetting properties of a phase-separating binary fluid within the mean-field approximation. The studied system can lead to firstorder wetting transition which is characterized by a layering-like behavior due to the clustering properties of GEM particles. Finally, we describe the dynamic behavior of the crystal phase of GEM mixtures by means of extensive molecular dynamics simulations. In particular, we investigate the effect of the addition of non-clustering particles on the dynamic scenario of one-component cluster crystals." @default.
- W763239736 created "2016-06-24" @default.
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- W763239736 date "2011-01-01" @default.
- W763239736 modified "2023-09-27" @default.
- W763239736 title "Structure and Dynamics of Binary Soft-Colloid mixtures" @default.
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