Study on photobleaching of methylene blue doped in PMMA, PVA and gelatin using photoacoustic technique
The photobleaching of Methylene blue embedded in the solid matrix PMMA (poly(methylmethacrylate)), PVA (poly(vinyl alcohol)) and gelatin has been investigated using a photoacoustic technique. Photoacoustic signals were measured as a function of time, chopping frequency, and the beam power. Experimen...
| Main Authors: | , , |
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| Format: | Article |
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World Scientific Publishing Co. Pte Ltd
2003
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| Online Access: | http://psasir.upm.edu.my/id/eprint/118901/ |
| _version_ | 1848867818473259008 |
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| author | Mat Yunus, W. Mahmood Chan, Kok Sheng W. Yunus, Wan Md. Zin |
| author_facet | Mat Yunus, W. Mahmood Chan, Kok Sheng W. Yunus, Wan Md. Zin |
| author_sort | Mat Yunus, W. Mahmood |
| building | UPM Institutional Repository |
| collection | Online Access |
| description | The photobleaching of Methylene blue embedded in the solid matrix PMMA (poly(methylmethacrylate)), PVA (poly(vinyl alcohol)) and gelatin has been investigated using a photoacoustic technique. Photoacoustic signals were measured as a function of time, chopping frequency, and the beam power. Experimental results indicate that the photobleaching rate is proportional to the incident laser power (260-300 mW) and decreased with increasing the concentration of dopant molecules. Methylene blue embedded in PVA shows the highest photobleaching rate then followed by gelatin and PMMA. The increase of photobleaching rate in PVA is also noticed when the beam power is increased. The thermal diffusivity values obtained for bleached PMMA, PVA and gelatin are 1.46 × 10-3 cm2/s, 0.83 × 10-3 cm2/s and 1.10 × 10-3 cm2/s respectively. Spectrophotometer and Raman spectroscopy were used to confirm the photoacoustic results. |
| first_indexed | 2025-11-15T14:42:32Z |
| format | Article |
| id | upm-118901 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-15T14:42:32Z |
| publishDate | 2003 |
| publisher | World Scientific Publishing Co. Pte Ltd |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | upm-1189012025-07-29T03:52:32Z http://psasir.upm.edu.my/id/eprint/118901/ Study on photobleaching of methylene blue doped in PMMA, PVA and gelatin using photoacoustic technique Mat Yunus, W. Mahmood Chan, Kok Sheng W. Yunus, Wan Md. Zin The photobleaching of Methylene blue embedded in the solid matrix PMMA (poly(methylmethacrylate)), PVA (poly(vinyl alcohol)) and gelatin has been investigated using a photoacoustic technique. Photoacoustic signals were measured as a function of time, chopping frequency, and the beam power. Experimental results indicate that the photobleaching rate is proportional to the incident laser power (260-300 mW) and decreased with increasing the concentration of dopant molecules. Methylene blue embedded in PVA shows the highest photobleaching rate then followed by gelatin and PMMA. The increase of photobleaching rate in PVA is also noticed when the beam power is increased. The thermal diffusivity values obtained for bleached PMMA, PVA and gelatin are 1.46 × 10-3 cm2/s, 0.83 × 10-3 cm2/s and 1.10 × 10-3 cm2/s respectively. Spectrophotometer and Raman spectroscopy were used to confirm the photoacoustic results. World Scientific Publishing Co. Pte Ltd 2003 Article PeerReviewed Mat Yunus, W. Mahmood and Chan, Kok Sheng and W. Yunus, Wan Md. Zin (2003) Study on photobleaching of methylene blue doped in PMMA, PVA and gelatin using photoacoustic technique. Journal of Nonlinear Optical Physics and Materials, 12 (1). pp. 91-100. ISSN 0218-8635; eISSN: 0218-8635 https://www.worldscientific.com/doi/abs/10.1142/S0218863503001237 10.1142/S0218863503001237 |
| spellingShingle | Mat Yunus, W. Mahmood Chan, Kok Sheng W. Yunus, Wan Md. Zin Study on photobleaching of methylene blue doped in PMMA, PVA and gelatin using photoacoustic technique |
| title | Study on photobleaching of methylene blue doped in PMMA, PVA and gelatin using photoacoustic technique |
| title_full | Study on photobleaching of methylene blue doped in PMMA, PVA and gelatin using photoacoustic technique |
| title_fullStr | Study on photobleaching of methylene blue doped in PMMA, PVA and gelatin using photoacoustic technique |
| title_full_unstemmed | Study on photobleaching of methylene blue doped in PMMA, PVA and gelatin using photoacoustic technique |
| title_short | Study on photobleaching of methylene blue doped in PMMA, PVA and gelatin using photoacoustic technique |
| title_sort | study on photobleaching of methylene blue doped in pmma, pva and gelatin using photoacoustic technique |
| url | http://psasir.upm.edu.my/id/eprint/118901/ http://psasir.upm.edu.my/id/eprint/118901/ http://psasir.upm.edu.my/id/eprint/118901/ |