Citation
Abstract
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.
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Official URL or Download Paper: https://www.worldscientific.com/doi/abs/10.1142/S0...
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Additional Metadata
| Item Type: | Article |
|---|---|
| Divisions: | Faculty of Science |
| DOI Number: | https://doi.org/10.1142/S0218863503001237 |
| Publisher: | World Scientific Publishing Co. Pte Ltd |
| Keywords: | Photobleaching; Methylene blue; PMMA; PVA; Gelatin; Photoacoustic technique; Laser power; Dopant concentration; Thermal diffusivity; Spectrophotometry; Raman spectroscopy |
| Depositing User: | Ms. Azian Edawati Zakaria |
| Date Deposited: | 29 Jul 2025 03:52 |
| Last Modified: | 29 Jul 2025 03:52 |
| Altmetrics: | http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1142/S0218863503001237 |
| URI: | http://psasir.upm.edu.my/id/eprint/118901 |
| Statistic Details: | View Download Statistic |
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