Optical trapping of organic solvents in the form of microdroplets in water
This research aimed to develop a procedure to optically trap organic solvents in the form ofmicrodroplet and to evaluate its optical stiffness based on the corner frequency,??. The selected organic solvents were 1,2-dichlorobenzene, acetonitrile, chloroform, ethanol,ethyl acetate and toluene. Microd...
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| Format: | thesis |
| Language: | eng |
| Published: |
2020
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| Subjects: | |
| Online Access: | https://ir.upsi.edu.my/detailsg.php?det=6256 |
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| Summary: | This research aimed to develop a procedure to optically trap organic solvents in the form ofmicrodroplet and to evaluate its optical stiffness based on the corner frequency,??. The selected organic solvents were 1,2-dichlorobenzene, acetonitrile, chloroform, ethanol,ethyl acetate and toluene. Microdroplets in water solution were prepared by ultrasonication for 2minutes. Microdroplets in the range of 2 to 3 m in diameter were then trapped by using 915 nmlaser at power densities of 6.3, 7.4 and 8.4 MW/cm with laser spot size 1.1 m. A quadrantphotodiode (QPD) was used to collect the scattered light from the single trapped microdroplet. Thesignal was analysed using custom made software named OSCal to determine ?? of the opticaltrap. The results showed that 1,2-dichlorobenzene, chloroform and toluene formed stablemicrodroplets in water. Thus, these microdroplets can be optical trapped. The optical stiffnessas judged by ?? is within 1 to 10 pN/m. To conclude, only solvent with very low water solubilitycan form microdroplet solution and ?? depends on the laser power density, type of solvent andmicrodroplet size. This research implies that it can provide the information needed by otherresearchers in choosi g the suitable organic solvent for applications requiringan optical trapping technique. |
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