Pyrene fluorescence measurements of metastable oil droplets in surfactant-free oil-in-water emulsions |
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| Authors: | T Sakai K Kamogawa K O Kwon H Sakai M Abe |
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| Institution: | (1) Faculty of Science and Technology Tokyo University of Science 2641 Yamazaki, Noda Chiba 278-8510, Japan e-mail: abemasa@ci.noda.sut.ac.jp Tel.: +81-471-248650 Fax: +81-471-248650, JP;(2) Ele. & Sec Ed. Bureau, The Ministry of Education, Sports, Culture and Science Kasumigaseki, Chiyoda Tokyo 100-0013, Japan, JP;(3) Institute of Colloid and Interface Science Tokyo University of Science 1-3 Kagurazaka, Shinjuku Tokyo 162-8601, Japan, JP;(4) Korea Fire Equipment Inspection Corporation, 29-16, Shinheung-dong 3ga, Chung-ku, Inchon City Seoul, Korea, KR |
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| Abstract: | The fluorescence behavior of pyrene in oil droplets of a surfactant-free oil-in-water emulsion was studied for benzene, fluorobenzene,
n-hexane and cyclohexane droplets in water. The excimer–monomer fluorescence ratio immediately after sonication, I
E/I
M(0), of the benzene/water emulsion was 8–10 times larger than for the benzene solution. The ratio I
E/I
M(t) increased in the first 10–20 min before it decreased to zero. Similar behavior was observed for the fluorobenzene/water
emulsion, while I
E/I
M(0) for emulsions with n-hexane and cyclohexane was smaller than for benzene and fluorobenzene/water emulsions. I
E/I
M(t) hardly changed with time for the n-hexane and cyclohexane/water emulsions. This different behavior was attributed to the increased solubility of nanometer-size
droplets with benzene and fluorobenzene.
Received: 20 June 2001 Accepted: 19 April 2001 |
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| Keywords: | Molecular diffusion Ostwald ripening Surfactant-free oil-in-water emulsion Pyrene fluorescence IE/IM and I1/I3 ratios |
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