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2000-2002 S&T e-Digest Contents


Vol. 38, Issue 12, December 2003, pp. 67-73




Measurements of Critical Micelle Concentration (CMC) Using U-shaped

Optical Fiber Doped Porous Sol-Gel Cladding


C. D. Singh*, H. Isobe*, H. Katsumata* and M. Ogita**


* Graduate School of Electronics Science and Technology, Sizuoka University,

3-5-1 Johoku, Hamamatsu 432-8561, Shizuoka, Japan

** Electrical and Electronic Engineering Dept, Faculty of Engineering, Shizuoka University,

3-5-1 Johoku, Hamamatsu 432-8561, Shizuoka, Japan



Received: 17 November 2003    /Accepted: 12 December 2003    /Published: 18 December 2003


Abstract: We present a sol-gel derived coating U-shaped optical fiber sensors for measurement of critical micelle concentration of surfactants. A sol-gel process for making porous silica and doping the U-shaped fiber core with sensing material is described. The doped sol-gel cladding fiber was used to construct an active cladding U-shaped optical fiber CMC measurement sensor. The porous sol-gel film was deposited a 1000 mm core plastic clad silica fiber after removing the cladding of the fiber at the middle portion nearly 6 cm and bending in U-shaped design. CMC detection is based on an adsorption effect in sample solution mainly of sodium dodecylbenzenesulfonate. Three different particles size of sol-gel porous cladding were tested in our lab. Test results show that the sensitivity of the small particle size porous sol-gel cladding U-shaped optical fiber in sensing region is higher than that of large particle size sol-gel cladding based U-shaped. It was also found that measurement of CMC point using this method is very accurate and cost effective.


Keywords: optical fiber; surfactants; adsorption effect; Sol-Gel


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