Synthesis and properties of two photochromic dyes
Photochromic dyes have been extensively studied due to their demands and applications especially in the ophthalmic lens industry. Photochromic lenses respond reversibly to the light intensity; darkens with ultraviolet exposure and changes back to its original state with reduced exposure....
| Main Author: | |
|---|---|
| Other Authors: | |
| Format: | Final Year Project (FYP) |
| Language: | English |
| Published: |
2012
|
| Subjects: | |
| Online Access: | http://hdl.handle.net/10356/48810 |
| _version_ | 1826120087181983744 |
|---|---|
| author | Ng, Shihui. |
| author2 | School of Materials Science and Engineering |
| author_facet | School of Materials Science and Engineering Ng, Shihui. |
| author_sort | Ng, Shihui. |
| collection | NTU |
| description | Photochromic dyes have been extensively studied due to their demands and applications especially in the ophthalmic lens industry. Photochromic lenses respond reversibly to the light intensity; darkens with ultraviolet exposure and changes back to its original state with reduced exposure.
Two photochromic dyes are synthesized and properties in colour change are observed. Photochromic dyes when exposed to ultraviolet light, it experiences a transformation from its colourless closed form isomer to the coloured opened form isomer.
Identification of intermediate products in the synthesis of Dye 1 and 2 are carried out using techniques such as Electrospray ionization mass spectrometry (MS-ESI), Proton Nuclear Magnetic Resonance (H-NMR), Mass Spectrometry Time -of-Flight (MS-TOF).
Finally, Ultraviolet-Visible (UV-Vis) Spectroscopy is conducted on both Dye 1 and 2, and properties are observed. However, transition time of the dyes from coloured to its colourless state, need to be shortened for applications. |
| first_indexed | 2024-10-01T05:10:28Z |
| format | Final Year Project (FYP) |
| id | ntu-10356/48810 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T05:10:28Z |
| publishDate | 2012 |
| record_format | dspace |
| spelling | ntu-10356/488102023-03-04T15:30:53Z Synthesis and properties of two photochromic dyes Ng, Shihui. School of Materials Science and Engineering Zhang Qichun DRNTU::Engineering::Materials::Photonics and optoelectronics materials Photochromic dyes have been extensively studied due to their demands and applications especially in the ophthalmic lens industry. Photochromic lenses respond reversibly to the light intensity; darkens with ultraviolet exposure and changes back to its original state with reduced exposure. Two photochromic dyes are synthesized and properties in colour change are observed. Photochromic dyes when exposed to ultraviolet light, it experiences a transformation from its colourless closed form isomer to the coloured opened form isomer. Identification of intermediate products in the synthesis of Dye 1 and 2 are carried out using techniques such as Electrospray ionization mass spectrometry (MS-ESI), Proton Nuclear Magnetic Resonance (H-NMR), Mass Spectrometry Time -of-Flight (MS-TOF). Finally, Ultraviolet-Visible (UV-Vis) Spectroscopy is conducted on both Dye 1 and 2, and properties are observed. However, transition time of the dyes from coloured to its colourless state, need to be shortened for applications. Bachelor of Engineering (Materials Engineering) 2012-05-10T01:12:15Z 2012-05-10T01:12:15Z 2012 2012 Final Year Project (FYP) http://hdl.handle.net/10356/48810 en Nanyang Technological University 35 p. application/pdf |
| spellingShingle | DRNTU::Engineering::Materials::Photonics and optoelectronics materials Ng, Shihui. Synthesis and properties of two photochromic dyes |
| title | Synthesis and properties of two photochromic dyes |
| title_full | Synthesis and properties of two photochromic dyes |
| title_fullStr | Synthesis and properties of two photochromic dyes |
| title_full_unstemmed | Synthesis and properties of two photochromic dyes |
| title_short | Synthesis and properties of two photochromic dyes |
| title_sort | synthesis and properties of two photochromic dyes |
| topic | DRNTU::Engineering::Materials::Photonics and optoelectronics materials |
| url | http://hdl.handle.net/10356/48810 |
| work_keys_str_mv | AT ngshihui synthesisandpropertiesoftwophotochromicdyes |