Polymer Brushes for Molecular Transport - Paul Braun Research ...

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polymer regions, and possible explanations are rotational diffusion and a combination of fast surface diffusion and slow bulk diffusion. PNIPAAm chains are tethered onto silica particles via surface-initiated polymerization. Thermal annealing slightly improved the crystallinity of the colloidal assembly. Video microscopy of the two-dimensional diffusion of these colloids suggested that PNIPAAm brushes greatly improve the stability of the colloidal system. A three-fold increase in diffusion coefficient is observed when the temperature is increased from 22 ºC to 39 ºC. The LCST transition of PNIPAAm plays an important role in the diffusion of the colloids, and the interdigitation between PNIPAAm chains may have slowed down the colloidal diffusion at room temperature.
© 2005 by Huilin Tu. All rights reserved.
Page 1: POLYMER BRUSHES FOR MOLECULAR TRANS
Page 5 and 6: ABSTRACT This thesis studies 2-dime
Page 7 and 8: For my family v
Page 9 and 10: from a vision to concrete plans, an
Page 11 and 12: TABLE OF CONTENTS LIST OF ABBREVIAT
Page 13 and 14: 4.3.6.2 FRAP of Prodan in the patte
Page 15 and 16: CHAPTER 1 INTRODUCTION 1.1 Objectiv
Page 17 and 18: fundamentally different from most o
Page 19 and 20: 1.1.2 General experimental approach
Page 21 and 22: 1.2.1 “Grafting to” approach
Page 23 and 24: mechanism at the later stage, and t
Page 25 and 26: laboratory), sometimes rough,[36] a
Page 27 and 28: (a) (b) Figure 1.4. Schematic repre
Page 29 and 30: 31. S.-J. Ahn, W.-K. Lee, S. Zausch
Page 31 and 32: CHAPTER 2 PRODAN DIFFUSION ON SELF-
Page 33 and 34: tested under continuous flow of nit
Page 35 and 36: coverslips. Water contact angle dat
Page 37 and 38: (a) 0 s 10 s 30 s 120 µm 60 s 120
Page 39 and 40: also sometimes observe bright dots
Page 41 and 42: and the dye, and thus recovery due
Page 43 and 44: 2.5 References 1. C. E. Heitzman, P
Page 45 and 46: formed on gold through microcontact
Page 47 and 48: organic solvents.) for 30 minutes f
Page 49 and 50: Scheme 3.1. SiO2 OH SiO2 O Si 3.2.4
Page 51 and 52: sp 3 hybridized carbon peak confirm
Page 53 and 54:
Reflectivity Figure 3.5. X-ray refl
Page 55 and 56:
The AFM images of the patterned PNI
Page 57 and 58:
3.3.7 Fluorescence studies 3.3.7.1
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FRAP images and corresponding fluor
Page 61 and 62:
advancing water contact angles for
Page 63 and 64:
ushes was in the range of 446-450 n
Page 65 and 66:
of interest to inside, and so the e
Page 67 and 68:
observed are rotational diffusion a
Page 69 and 70:
38. D. Hall, J. Torkelson, Macromol
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energy-density battery applications
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4.1.3 Oligoethylene glycol containi
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was used to test the thickness chan
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The samples are sonicated in aceton
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ToF SIMS characterization of POEGA
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0 = f where fp and fH2O are volume
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T gp temperature over solvent glass
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elative humidity), 25% relative hum
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(a) 15s 30s 60s 120s Figure 4.8. FR
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of 2.5 nm (as measured by AFM on a
Page 91 and 92:
4.3.5.2 Diffusion of Prodan in the
Page 93 and 94:
(a) (b) (c) (d) 500 nm 0 25 nm 0 0
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Another possibility is that the nak
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ToF SIMS, and the physical properti
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26. L. Lavielle, in Polymer Surface
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presence of a flat wall, and (4) mo
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ultrasonication. After two centrifu
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silicone solution holder (GRACE Bio
Page 107 and 108:
5.3.3 Temperature-response of the c
Page 109 and 110:
more frequently within its “cage
Page 111 and 112:
From the trajectories presented in
Page 113 and 114:
described by Equation 5.5. And then
Page 115 and 116:
3. D. Rosenbaum, P. C. Zamora, C. F
Page 117 and 118:
XPS and FTIR confirmed the chemical
Page 119 and 120:
developed in this thesis have intri
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