Ordered nanostructures through colloidal self assembly
The fabrication of ordered nanostructures plays an important role in the realization of the potential of nanotechnology and consequently, it has become an intense field of research in recent years. One promising method of fabrication is the self assembly process of colloidal particles into ordered s...
Saved in:
Main Author: | |
---|---|
Other Authors: | |
Format: | Theses and Dissertations |
Language: | English |
Published: |
2008
|
Subjects: | |
Online Access: | https://hdl.handle.net/10356/13617 |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Institution: | Nanyang Technological University |
Language: | English |
id |
sg-ntu-dr.10356-13617 |
---|---|
record_format |
dspace |
spelling |
sg-ntu-dr.10356-136172020-11-01T11:29:45Z Ordered nanostructures through colloidal self assembly Koh, Yaw Koon Wong Chee Cheong Chiang Yet-Ming School of Materials Science & Engineering Singapore-MIT Alliance Programme DRNTU::Engineering::Materials::Nanostructured materials DRNTU::Engineering::Nanotechnology The fabrication of ordered nanostructures plays an important role in the realization of the potential of nanotechnology and consequently, it has become an intense field of research in recent years. One promising method of fabrication is the self assembly process of colloidal particles into ordered structures. The process is highly efficient but suffers from the drawback that defective structures form under most experimental conditions. This is due to the lack of understanding of the underlying mechanism. In this thesis, the process is investigated in order to help in the understanding. This is achieved by monitoring the structural changes in-situ during the process. The method of monitoring makes use of a property of the nanostructure known as the photonic bandgap. The bandgap is strongly dependent on the quality of the structure and can be monitored easily by simple optical methods. One important result of the experiments is the identification of a transition structure during the self assembly process. The driving force for the transition structure is the microscopic interaction forces between the particles in suspension. This observation highlights the inadequacies of previous studies where the driving force for colloidal self assembly is solely attributed to capillary forces. By combining both the interaction and capillary forces, the mechanism of self assembly is elucidated. With the new understanding, the origin of defects can be identified. Finally, conditions for growth of high quality nanostructures by colloidal self assembly are also identified. Doctor of Philosophy (AMM and NS) 2008-10-20T10:02:13Z 2008-10-20T10:02:13Z 2007 2007 Thesis Koh, Y. K. (2007). Ordered nanostructures through colloidal self assembly. Doctoral thesis, Nanyang Technological University, Singapore. https://hdl.handle.net/10356/13617 10.32657/10356/13617 en 136 p. application/pdf |
institution |
Nanyang Technological University |
building |
NTU Library |
continent |
Asia |
country |
Singapore Singapore |
content_provider |
NTU Library |
collection |
DR-NTU |
language |
English |
topic |
DRNTU::Engineering::Materials::Nanostructured materials DRNTU::Engineering::Nanotechnology |
spellingShingle |
DRNTU::Engineering::Materials::Nanostructured materials DRNTU::Engineering::Nanotechnology Koh, Yaw Koon Ordered nanostructures through colloidal self assembly |
description |
The fabrication of ordered nanostructures plays an important role in the realization of the potential of nanotechnology and consequently, it has become an intense field of research in recent years. One promising method of fabrication is the self assembly process of colloidal particles into ordered structures. The process is highly efficient but suffers from the drawback that defective structures form under most experimental conditions. This is due to the lack of understanding of the underlying mechanism. In this thesis, the process is investigated in order to help in the understanding. This is achieved by monitoring the structural changes in-situ during the process. The method of monitoring makes use of a property of the nanostructure known as the photonic bandgap. The bandgap is strongly dependent on the quality of the structure and can be monitored easily by simple optical methods. One important result of the experiments is the identification of a transition structure during the self assembly process. The driving force for the transition structure is the microscopic interaction forces between the particles in suspension. This observation highlights the inadequacies of previous studies where the driving force for colloidal self assembly is solely attributed to capillary forces. By combining both the interaction and capillary forces, the mechanism of self assembly is elucidated. With the new understanding, the origin of defects can be identified. Finally, conditions for growth of high quality nanostructures by colloidal self assembly are also identified. |
author2 |
Wong Chee Cheong |
author_facet |
Wong Chee Cheong Koh, Yaw Koon |
format |
Theses and Dissertations |
author |
Koh, Yaw Koon |
author_sort |
Koh, Yaw Koon |
title |
Ordered nanostructures through colloidal self assembly |
title_short |
Ordered nanostructures through colloidal self assembly |
title_full |
Ordered nanostructures through colloidal self assembly |
title_fullStr |
Ordered nanostructures through colloidal self assembly |
title_full_unstemmed |
Ordered nanostructures through colloidal self assembly |
title_sort |
ordered nanostructures through colloidal self assembly |
publishDate |
2008 |
url |
https://hdl.handle.net/10356/13617 |
_version_ |
1688665249336524800 |