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

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EXPERIMENTAL AND THEORETICAL BEHAVIOUR OF END-TETHERED POLYMERS FROM THE MUSHROOM TO THE BRUSH LIMITS M.D. Whitmore 1) , M. Pépin 1) , M.S. Kent 2) , G. Grest 2) , J. Douglas 3) 1) Dept. of Physics and Physical Oceanography, Memorial University of Newfoundland, St. John's, NF, Canada, A1B 3X7 2) Sandia National Laboratory, Albuquerque, NM 87185, U.S.A. 3) Polymers Division, National Institute of Science and Technology, Gaithersburg, MD 20899, U.S.A. email: markw@physics.mun.ca ABSTRACT We present systematic experimental results on the thickness of end-tethered polymer layers in good and Θ solvents. These results clearly show that most experimental systems fall between the mushroom and brush regimes. We then show that numerical self-consistent field theory, which uses appropriate values for monomer and solvent volumes and statistical segment lengths, provides quantitative agreement with experiment in these ranges. We go on to introduce a new parameter for characterizing the tethered-layer coverage, and use it to propose a unified description of these systems that applies from the mushroom regime, through the intermediate regime where most experiments occur, to deep into the brush limit, for layers in both good and Θ solvents. The analysis is based on a generalization of the asymptotic SCF theory, numerical SCF theory, Monte Carlo and molecular dynamics simulations, and the experimental data.
PERSISTENCE LENGTH OF WORM-LIKE MICELLES OF NON-IONIC SURFACTANTS Y. Lauw, F.A.M. Leermakers Laboratory of Physical Chemistry and Colloid Science, Wageningen University, Dreijenplein 6, 6703 HB Wageningen, The Netherlands email: yansen@fenk.wau.nl ABSTRACT The persistence length of worm-like micelles is calculated by using two-gradient self-consistent field (SCF) theory within a cylindrical coordinates system. The CnEm non-ionic surfactants are used and forced into a toroidal-shaped micelles. This leads to a persistent length l p which scales with the tail length n as l x p ∞ n in which x is about 2.5. Furthermore the calculated bending energy at high total curvatures J, shows a deviation that can be attributed to a higher order term proportional to J 3 .
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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
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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 and 64: INFLUENCE OF POLYMERS ON THE BENDIN
Page 65: SPINODAL DECOMPOSITION IN BINARY PO
Page 69 and 70: For small particles with radius R <
Page 71: MEAN-FIELD THEORY FOR THE ADSORPTIO
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Collapse of polymer brushes grafted onto planar ... - Wageningen UR

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