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Measurement of the extinction coefficients of magnetic fluids.

Fang X, Xuan Y, Li Q - Nanoscale Res Lett (2011)

Bottom Line: The measuring principle and accuracy of the approach are analysed.The relative uncertainty of experimental data is less than 1.8%.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.

View Article: PubMed Central - HTML - PubMed

Affiliation: School of Power Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China. ymxuan@mail.njust.edu.cn.

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 1.8%. 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.

No MeSH data available.


Spectral transmittance of water films with two different thicknesses.
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Figure 3: Spectral transmittance of water films with two different thicknesses.

Mentions: In order to validate the accuracy of this method, the extinction coefficient of water was measured at 25°C. First, two water films of different thicknesses were fabricated. Then, the transmittivity values of the two films were measured using a Lambda 950 spectrophotometer, and the results are illustrated in Figure 3. Consequently, the two transmittivity equations of the water films could be established according to Equations 1-10. These equations are solved using Levanberg-Marquardt arithmetic and global optimization method, and the extinction coefficients of the water film are obtained. As shown in Figure 4, the results obtained from the present method are in good concurrence with those obtained from Hale and Querry's approach [16].


Measurement of the extinction coefficients of magnetic fluids.

Fang X, Xuan Y, Li Q - Nanoscale Res Lett (2011)

Spectral transmittance of water films with two different thicknesses.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211297&req=5

Figure 3: Spectral transmittance of water films with two different thicknesses.
Mentions: In order to validate the accuracy of this method, the extinction coefficient of water was measured at 25°C. First, two water films of different thicknesses were fabricated. Then, the transmittivity values of the two films were measured using a Lambda 950 spectrophotometer, and the results are illustrated in Figure 3. Consequently, the two transmittivity equations of the water films could be established according to Equations 1-10. These equations are solved using Levanberg-Marquardt arithmetic and global optimization method, and the extinction coefficients of the water film are obtained. As shown in Figure 4, the results obtained from the present method are in good concurrence with those obtained from Hale and Querry's approach [16].

Bottom Line: The measuring principle and accuracy of the approach are analysed.The relative uncertainty of experimental data is less than 1.8%.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.

View Article: PubMed Central - HTML - PubMed

Affiliation: School of Power Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China. ymxuan@mail.njust.edu.cn.

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 1.8%. 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.

No MeSH data available.