TAILIEUCHUNG - Fang et al. Nanoscale Research Letters 2011, 6:237

Fang et al. Nanoscale Research Letters 2011, 6:237 NANO REVIEW Open Access Measurement of the extinction coefficients of magnetic fluids Xiaopeng Fang, Yimin Xuan*, Qiang Li Abstract A novel spectral transmittance approach for measuring the extinction coefficient of magnetic fluids is proposed. The measuring principle and accuracy of the approach are analysed. Experiments are conducted to measure the extinction coefficient of magnetic fluids with different particle volume fractions. The relative uncertainty of experimental data is less than . The experimental results indicate that the extinction coefficient of magnetic fluids increases with increase of the volume fraction of suspended magnetic nanoparticles and the optical properties. | Fang et al. Nanoscale Research Letters 2011 6 237 http content 6 1 237 o Nanoscale Research Letters a SpringerOpen Journal NANO REVIEW Open Access Measurement of the extinction coefficients of magnetic fluids Xiaopeng Fang Yimin Xuan Qiang Li Abstract A novel spectral transmittance approach for measuring the extinction coefficient of magnetic fluids is proposed. The measuring principle and accuracy of the approach are analysed. Experiments are conducted to measure the extinction coefficient of magnetic fluids with different particle volume fractions. The relative uncertainty of experimental data is less than . The experimental results indicate that the extinction coefficient of magnetic fluids increases with increase of the volume fraction of suspended magnetic nanoparticles and the optical properties of the particle material have a significant effect on the extinction coefficient of the magnetic fluids. Introduction Magnetic fluid is a kind of colloidal suspension containing surfactant-coated magnetic nanoparticles dispersed in carrier liquids such as water and oil. Since the emergence of magnetic fluid in the 1960s researchers have conducted many investigations on the characters of magnetic fluids. When light is incident into the magnetic fluid the magnetic nanoparticles suspended in the base fluid will interact with the incident light and affect the propagation of the incident light. Magnetic fluid presents some special optical characters such as birefringence 1-5 and magnetochromatics 6 7 . Recently the remarkable magneto-optical characters of magnetic fluids have attracted enormous attention of researchers who tried to apply magnetic fluids to optical devices such as fabricating optical switches 8 tunable filters 9 magnetic-field sensors 10 and tunable optical grating 11 12 . Although the optical characters of the magnetic fluids have been studied for decades and novel phenomena have been discovered there are few reports on the .

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