Collapse of polymer brushes grafted onto planar ... - Wageningen UR

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INTERFACES, WETTING, AND CAPILLARY NEMATISATION IN COLLOIDAL ROD SUSPENSIONS R. van Roij Institute for Theoretical Physics, Utrecht University, Postbus 80.195, 3508 TD, Utrecht, The Netherlands email: r.vanroij@phys.uu.nl ABSTRACT We study the thermodynamics and structure of interfaces and films in colloidal hard-rod fluids within an Onsager-like density functional theory. For a one-component system, we find complete wetting near a hard wall and capillary nematisation (with a capillary critical point) in a slit confined by two hard walls. For binary mixtures of hard rods we study the planar interfaces of coexisting isotropic and nematic phases. We calculate the surface tension, the interface-induced biaxiality, and the density and order parameter profiles through the interface. In the case that the bulk phase diagram exhibits an isotropic-nematic-nematic (I-N1-N2) triple point, we find complete wetting of the I-N2 interface by N1 upon approach of the triple point. This triple-point wetting is an entropy-driven analogue of e.g. surface melting of a metal upon approach of the melting temperature. References 1. Van Roij, R., Dijkstra, M. and Evans, R., 2000. Europhys. Lett. 49, 350. 2. Shundyak, K. and van Roij, R., 2002. Phys. Rev. Lett. 88, 205501.
SPINODAL DECOMPOSITION IN BINARY POLYMERIC BLENDS M.E. Velázquez-Sánchez, P.D. Anderson, P.G.T. van der Varst, G. de With Technische Universiteit Eindhoven, Postbus 513, 5600 MB Eindhoven, The Netherlands email: M.velazquez-sanchez@tue.nl ABSTRACT This work aims to predict the morphology development in films, on a substrate, made from binary polymeric blends that undergo phase separation via a spinodal decomposition mechanism. From thermodynamics it is possible to predict the spinodal and binodal regions of a system, once the Flory-Huggins interaction parameter is known; however to know how the morphology develops as a function of time, the diffusion equation must be solved. A diffuse-interface model that couples the thermodynamics and the hydrodynamics of a binary system is used. As an input, this model uses a chemical potential where the wall interaction and the non-local effects in the enthalpy and the entropy are taken into account. Preliminary results show that the introduction of the wall potential plays an important role in the development of the spinodal decomposition, resulting in a more complex morphology, where formation of macroscopic layers close to the substrate is obtained. Additionally, the growth rate of concentration fluctuations is significantly influenced by the wall.
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Frontis - Wageningen International
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Prof. dr. Hans Fraaije Leiden Unive
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Prof. Ullrich Steiner University of
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Preface Self-consistent field model
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covered by polymers), and R. Rajago
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FIRST-ORDER WETTING TRANSITION AT F
Page 13 and 14: MOLECULAR SCF MODELLING OF PORES IN
Page 15 and 16: COLLAPSE OF POLYMER BRUSHES GRAFTED
Page 17 and 18: SURFACE FORCES, SUPRAMOLECULAR POLY
Page 19 and 20: SWEET BRUSHES: SYNTHESIS AND INTERF
Page 21 and 22: EFFECT OF MIXING OF TWO CHARGED PHO
Page 23 and 24: Figure 2 show a semi-log comparison
Page 25 and 26: MODELING OF STATIONARY POLYMER DIFF
Page 27 and 28: THEORY AND SIMULATION OF BILAYER ME
Page 29 and 30: Figure 1. Time evolution of the she
Page 31 and 32: SALT EFFECT TO RAYLEIGH DROPLETS OF
Page 33 and 34: MACROMOLECULES AT INTERFACES, A FLE
Page 35 and 36: APPLICATION OF HETEROGENEOUS LATTIC
Page 37 and 38: 8. Linse, P., 1993b. Phase behavior
Page 39 and 40: MODELING INTERFACIAL EFFECTS ON THE
Page 41 and 42: Using this patterned electrode, we
Page 43 and 44: span the gap between the electrodes
Page 45 and 46: desirable to use a probe with a muc
Page 47 and 48: span the gap between the electrodes
Page 49 and 50: MEMBRANE FUSION: RESULTS FROM SIMUL
Page 51 and 52: the transition temperature T * when
Page 53 and 54: PROTEIN ADSORPTION ON SURFACES WITH
Page 55 and 56: MODELLING STRUCTURE AND ADHESION AT
Page 57 and 58: References 1. Fischel, L.B. and The
Page 59 and 60: MULTIDOMAIN CONFORMATIONS OF RANDOM
Page 61 and 62: SUPRAMOLECULAR COORDINATION POLYMER
Page 63: INFLUENCE OF POLYMERS ON THE BENDIN
Page 67 and 68: PERSISTENCE LENGTH OF WORM-LIKE MIC
Page 69 and 70: For small particles with radius R <
Page 71: MEAN-FIELD THEORY FOR THE ADSORPTIO
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