Photomechanical Materials, Composites, and Systems Wireless Transduction of Light into Work

Timothy J. White, PhD, lives and works in Dayton, OH. Dr. White is a leading researcher in the soft materials community, recently recognized by awards from the MRS, ACS, and SPIE. His research has generally focused on photoinduced effects in materials. Dr. White has published more than 100 peer-reviewed papers.

List of Contributors xi

Preface xv

1 A Historical Overview of Photomechanical Effects in Materials, Composites, and Systems 1
Toru Ube and Tomiki Ikeda

1.1 Introduction 1

References 25

2 Photochromism in the Solid State 37
Oleksandr S. Bushuyev and Christopher J. Barrett

2.1 Molecular Photoswitches in the Solid State 37

2.2 Molecular and Macroscopic Motion of Azobenzene Chromophores 39

2.3 Photomechanical Effects 41

2.4 Solid-State Photochromic Molecular Machines 54

2.5 Surface Mass Transport and Phase Change Effects 62

2.6 Photochromic Reactions in Framework Architectures 65

2.7 Summary and Outlook 68

References 69

3 Photomechanics: Bend, Curl, Topography, and Topology 79
Daniel Corbett, Carl D. Modes, and Mark Warner

3.1 The Photomechanics of Liquid-Crystalline Solids 81

3.2 Photomechanics and Its Mechanisms 82

3.3 A Sketch of Macroscopic Mechanical Response in LC Rubbers and Glasses 92

3.4 Photo- and Heat-Induced Topographical and Topological Changes 97

3.5 Continuous Director Variation, Part 1 97

3.6 Mechanico-Geometric Effects, Part 1 100

3.7 Continuous Director Variation, Part 2 100

3.8 Continuous Director Variation, Part 3 103

3.9 Mechanico-Geometric Effects, Part 2 106

3.10 Director Fields with Discontinuities–Advanced Origami! 107

3.11 Mechanico-Geometric Consequences of Nonisometric Origami 110

3.12 Conclusions 110

References 112

4 Photomechanical Effects in Amorphous and Semicrystalline Polymers 117
Jeong JaeWie

4.1 Introduction 117

4.2 Polymeric Materials 119

4.3 The Amorphous Polymer State 119

4.4 The Semicrystalline Polymer State 121

4.5 Absorption Processes 124

4.6 Photomechanical Effects in Amorphous and Semicrystalline Azobenzene-Functionalized Polymers 126

4.7 Molecular Alignment 132

4.8 Annealing and Aging 138

4.9 Sub-Tg SegmentalMobility 142

4.10 Cross-Link Density 145

4.11 Concluding Remarks 146

References 148

5 Photomechanical Effects in Liquid-Crystalline Polymer Networks and Elastomers 153
Timothy J. White

5.1 Introduction 153

5.2 Optically Responsive Liquid Crystal Polymer Networks 159

5.3 Literature Survey 165

5.4 Outlook and Conclusion 169

References 171

6 Photomechanical Effects in Polymer Nanocomposites 179
Balaji Panchapakesan, Farhad Khosravi, James Loomis, and Eugene M. Terentjev

6.1 Introduction 179

6.2 Photomechanical Actuation in Polymer–Nanotube Composites 180

6.3 Fast Relaxation of Carbon Nanotubes in Polymer Composite Actuators 186

6.4 Highly Oriented Nanotubes for Photomechanical Response and Flexible Energy Conversion 191

6.5 Photomechanical Actuation Based on 2-D Nanomaterial (Graphene)–Polymer Composites 205

6.6 Applications of Photomechanical Actuation in Nanopositioning 213

6.7 Future Outlook 224

Acknowledgments 225

References 225

7 Photomechanical Effects in Photochromic Crystals 233
Lingyan Zhu, Fei Tong, Rabih O. Al-Kaysi, and Christopher J. Bardeen

7.1 Introduction 233

7.2 General Principles for Organic Photomechanical Materials 234

7.3 History and Background 234

7.4 Modes of Mechanical Action 240

7.5 Photomechanical Molecular Crystal Systems 242

7.6 Future Directions 260

7.7 Conclusion 264

Acknowledgments 264

References 264

8 Photomechanical Effects in Piezoelectric Ceramics 275
Kenji Uchino

8.1 Introduction 275

8.2 Photovoltaic Effect 276

8.3 Photostrictive Effect 288

8.4 Photostrictive Device Applications 294

8.5 Concluding Remarks 299

References 300

9 Switching Surface Topographies Based on Liquid Crystal Network Coatings 303
Danqing Liu and Dirk J. Broer

9.1 Introduction 303

9.2 Liquid Crystal Networks 304

9.3 Conclusions 322

References 322

10 Photoinduced Shape Programming 327
Taylor H.Ware

10.1 One-Way Shape Memory 329

10.2 Two-Way Shape Memory 343

10.3 Summary and Outlook 358

References 358

11 Photomechanical Effects to Enable Devices 369
M. Ravi Shankar

11.1 Introduction 369

11.2 Analog Photomechanical Actuators 371

11.3 Discrete-State (Digital) Photomechanical Actuators 373

11.4 Photomechanical Mechanisms and Machines 387

References 388

12 Photomechanical Effects in Materials, Composites, and Systems: Outlook and Future Challenges 393
Timothy J.White

12.1 Introduction 393

12.2 Outlook and Challenges 393

12.3 Conclusion 401

References 401

Index 405

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