Inexpensive Wilhelmy balace based on a fiber optic sensor for the study of Langmuir films

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Título :	Inexpensive Wilhelmy balace based on a fiber optic sensor for the study of Langmuir films
Autor :	Gutiérrez, Héctor Chirinos, José Castillo, Jimmy Caetano, Manuel
Palabras clave :	fiber optic sensor Langmuir films Wilhelmy balance
Fecha de publicación :	1-abr-2005
Editorial :	Review of Scientific Instruments
Citación :	Rev. of Sci. Instr., 76, 045112 (Abril 2005)
Resumen :	An inexpensive Wilhelmy balance based on a fiber optic sensor capable of sensitive surface tensionmeasurements has been designed and implemented. The system consists of a leaf spring conforming a cantilever structure and a bifurcated optical fiber acting as a laser beam deflection detector. Operated in a static way, it achieves a force measurement sensitivity of 0.154 V by N and a tension surface resolution of 0.1 mN/m. π-A isotherms of Langmuir films from insoluble amphiphiles 5 hexadecanoylaminofluorescein (fluorescein H-110) in water, were followed as a model system to characterize this instrument.
URI :	http://hdl.handle.net/10872/6393
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