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Emerse, M, 2023. Investigating the curvature effects of substrates on wrinkling patterns through an innovative imaging technique. PhD, Nottingham Trent University.
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Abstract
Patterns are ubiquitous in the world around us, often arising from underlying physical, chemical, or biological processes. Wrinkling patterns on thin elastic shells, such as dried fruits, are examples of such patterns, and can result from mechanical instabilities driven by differences in lengths and strains. Controlling these wrinkles on flat and curved surfaces made from various materials is vital for customising material properties and strengthening structures. The wrinkling of thin surfaces also has practical applications across a range of research fields, including flexible electronic sensors and displays, solar cells, optical gratings etc., and understanding the process of wrinkling is important for better control of such systems. This thesis aims to investigate the influence of substrate curvature on the characteristics of wrinkling patterns, and also involves the development of a novel imaging technology. The innovative imaging approach involves measuring surface topography using patterns of projected dots, and is implemented in MAT-LAB; accuracy and reliability are enabled through rigorous validation procedures. The research meticulously analyses key wrinkle characteristics, such as wavelength and amplitude, under both positive and negative substrate curvatures. A further segment of the work explores patterns on photonic wafers induced by laser annealing, and demonstrates the link of these patterns to the thermal treatments involved. Additionally, the study also includes an effort to obtain insights into pattern formation resulting from swelling in hydrogel materials like gelatin and polyacrylamide. Through this comprehensive exploration of wrinkling patterns and their dependencies on substrate curvature, this research contributes valuable insights to our understanding and manipulation of pattern formation. These findings have broad applications across scientific and engineering disciplines, enhancing the understanding of the intricate interplay between form and function in the natural world.
| Item Type: | Thesis |
|---|---|
| Creators: | Emerse, M. |
| Contributors: | Name Role NTU ID ORCID |
| Date: | 30 September 2023 |
| Rights: | The copyright in this work is held by the author. You may copy up to 5work for private study, or personal, non-commercial research. Any re-use of the information contained within this document should be fully referenced, quoting the author, title, university, degree level and pagination. Queries or requests for any other use, or if a more substantial copy is required, should be directed to the author. |
| Divisions: | Schools > School of Science and Technology |
| Record created by: | Laura Ward |
| Date Added: | 23 Aug 2024 10:24 |
| Last Modified: | 23 Aug 2024 10:24 |
| URI: | https://irep.ntu.ac.uk/id/eprint/52079 |
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