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Biomimetic functionalization of SiO_1tn2 surfaces by membranes supported on polymeric tethers [Elektronische Ressource] / Christian Daniel

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Published 01 January 2010
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Biomimetic Functionalization of SiO Surfaces by 2
Membranes Supported on Polymeric Tethers

Christian Daniel

Technische Universität München
Physik Department
Lehrstuhl für Biophysik E22

Biomimetic Functionalization of SiO Surfaces by 2
Membranes Supported on Polymeric Tethers

Christian Daniel

Vollständiger Abdruck der von der Fakultät für Physik der Technischen Universität
München zur Erlangung des akademischen Grades eines

Doktors der Naturwissenschaften (Dr. rer. nat.)

genehmigten Dissertation.

Vorsitzender: Univ.-Prof. Dr. R. Netz

Prüfer der Dissertation: 1. Univ.-Prof. Dr. E. Sackmann

2. Univ.-Prof. Dr. J. O. Rädler,
Ludwig-Maximilians-Universität München

Die Dissertation wurde am 29.06.2010 bei der Technischen Universität München eingereicht und
durch die Fakultät für Physik am 13.07.2010 angenommen.

Meinen Eltern


Table of Contents

Zusammenfassung 1

Abstract 5

Introduction and Motivation 7

Chapter 1 Materials and Methods 11
1.1 Chemicals 11
1.2 Substrate 12
1.3 Lipid bilayer deposition 13
1.4 Experimental setup 13
1.4.1 Microfluidic chamber setup 14
1.4.2 Fluorescence Microscopy setup 16
1.4.3 X-ray reflectometer 17
1.5 Methods 17
1.5.1 X-ray Reflectometry (XRR) measurements 17
1.5.2 X-ray Photoelectron Spectroscopy (XPS) 19
1.5.3 Diffusion measurements with Fluorescence Microscopy 19

Chapter 2 Surface Functionalization 21
2.1 Introduction 21
2.2 Surface chemistry 23
2.3 X-ray Photoelectron Spectroscopy (XPS) results 25
2.4 X-Ray Reflectivity (XRR) of the surface in ambient conditions 28
2.4.1 VTS-PEGylated (PEG2000 and PEG750) 29
2.4.2 High and low PEG2000-DSPE tether grafting density 30
2.4.3 Low PEG2000-DSPE tether grafting density subsequently
backfilled with PEG750 and PEG2000 polymers 31
2.5 Discussion 34 TABLE OF CONTENTS 2

2.6 Outlook 35
2.7 Conclusion 36

Chapter 3 Tethered Lipid Bilayers 37
3.1 Introduction 37
3.2 X-ray Reflectivity and Fluorescence Microscopy characterization 39
3.2.1. X-ray Reflectivity of tethered lipid bilayers in water 39 Bilayers cushioned on tethers 40 Bilayers cushioned on tethers and backfilled polymers 41
3.2.2. Discussion of membrane reflectivity data 43
3.2.3. Fluorescence Imaging of tethered lipid membranes. 45
3.2.4. Discussion of fluorescence data 47
3.3 Conclusion and outlook 49

Appendix I Motility gliding assay: Myosin V anchored on a fluid solid
supported membrane 53
A1.1 Introduction and summary 53
A1.2 Results 54
A1.3 Conclusion and outlook 57

Foreword to Appendices II–IV 59

Appendix II The potential of the horizontal reflectometer REFSANS/FRM-II
for measuring low reflectivity and diffuse surface scattering 65

Appendix III Measurement of neutron flux and beam divergence at the cold
neutron guide system of the new Munich research reactor FRM-II 69

Appendix IV Horizontal ToF-neutron reflectometer REFSANS at FRM-II
Munich/Germany: First tests and status 79

Abbreviations 83

Bibliography 85

Publications 91

Acknowledgements 93

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