Light absorption and light scattering in magnetic fluids with different aggregative stability

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The optical effects of dichroism, static scattering and light extinction of under the action of a magnetic field in magnetic fluids with an average particle size of 6.7 and 13.7 nm have been studied. Significant differences were found both in the magnitude of the effects and in their spectral behavior, which can be associated with the formation of aggregates in the sample with larger particles, which significantly change the optical properties of the system. The appearance of aggregates under the action of the field was confirmed by the method of dynamic light scattering.

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作者简介

C. Yerin

North Caucasus Federal University

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Email: exiton@inbox.ru
俄罗斯联邦, Stavropol

V. Vivchar

North Caucasus Federal University

Email: exiton@inbox.ru
俄罗斯联邦, Stavropol

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2. Fig. 1. Transmission spectra of samples No. 1 and No. 2 of the same concentration of 0.5% in cuvettes of the same thickness.

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3. Fig. 2. Change in the transmission spectrum of sample No. 1 (a) and sample No. 2 (b) when exposed to a magnetic field.

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4. Fig. 3. Spectra of the dichroism effect in samples No. 1 (a) and No. 2 (b).

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5. Fig. 4. Change in the intensity of scattered light at an angle of 90° for sample No. 1 and sample No. 2 when exposed to a magnetic field.

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6. Fig. 5. Calculation of the cross-sections of attenuation (1), scattering σs (3) and absorption of light σa (2) by particles of arbitrary size according to the Mie theory.

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7. Fig. 6. Particle size distribution by contribution to scattered light intensity in sample No. 1 (a) and sample No. 2 (b).

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