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- W2489274311 abstract "The structure formation in films of charged, colloidal suspensions confined by uncharged and charged slit pores is investigated in the present thesis. The colloids in such systems are characterized by a surface charge corresponding to their size. The counterions, which dissolve from their surface into the solvent, yield an effective screening of the electrostatic repulsion between the particles. The aim of this work is to understand the impact of the system parameters on characteristic lengths, correlations, freezing and melting phenomena. Such parameters are salt concentration, density, particle size, and surface charges of the confining walls. Colloidal suspensions and their structural properties receive great attention in nature sciences and technology as, e. g., the preparation of membranes and photonic crystals. We consider the system on a theoretical level by employing MonteCarlo simulations where the particle-particle interactions are modeled via the Derjaguin-Landau-Verwey-Overbeek theory. A special focus in this work is the influence of surface charges of the confinement, providing additional counterions, on the structure formation. Our theoretical predictions for small particle densities are verified by colloidal-probe atomic-force microscope experiments. A prominent effect of confined colloidal and molecular particles is the particle layering parallel to the surfaces yielding the so-called structural forces. This effect exhibits a significant dependence on the system parameters. It involves the decrease of the amplitudes of the oscillating forces by increasing the salt concentration and a force enhancement by increasing the wall charge in a parameter range relevant for the experiment. Furthermore, we show that freezing and melting phenomena are influenced by confinement. In this context, we discuss the onset of crystallization for increasing density and the alternation of (staggered) hexagonaland square-like structures for narrowing the confinement. These phenomena, affected crucially by wall charges, show a surface-charge-induced reentrant freezing. Finally, the investigations are extended to charged, binary mixtures where we find a so-called structural crossover in homogeneous systems and discuss the impact of the confinement on the composition of the mixture. Our results contribute to the fundamental understanding of the structure formation in colloidal suspensions as well as in other systems like dusty plasmas and molecular systems. They are a base for further theoretical and experimental studies providing the knowledge for future applications and for understanding nature." @default.
- W2489274311 created "2016-08-23" @default.
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- W2489274311 date "2012-02-01" @default.
- W2489274311 modified "2023-09-27" @default.
- W2489274311 title "Structure formation of charged colloidal particles in confined geometry" @default.
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- W2489274311 doi "https://doi.org/10.14279/depositonce-3102" @default.
- W2489274311 hasPublicationYear "2012" @default.
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