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- 저자 : MADHULEKHA GOGOI (검색결과 1 건)
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MADHULEKHA GOGOI,PRITAM DEB 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2012 NANO Vol.7 No.4
The magnetic control on scattering of light by ultra¯ne iron oxide (?-Fe2O3) nanoparticles suspended in a carrier liquid was investigated. The light scattering behavior was studied using laser light under the in°uence of a permanent magnet over a rotating frame of reference. When the magnet is rotated continuously from 0? to 360? with respect to the direction of the incident laser beam, the scattered light pattern from the sample has the same angular displacement but in counter direction to the magnetic ¯eld rotation. When external ¯eld is not applied to the ferro°uid, no other preferred directional scattering of light is observed. The applied magnetic ¯eld induces directional self assembly of magnetic nanoparticles through dipole?dipole interactions. This ¯nally leads to the formation of \nanoparticle grating" and the optical geometry of diffraction grating clearly describes the anomalous scattering behavior of the ferro°uid. Most interestingly, for each complete orientation of the ¯eld from 0? to 360?, the transmitted light intensity switches between maxima and minima for longitudinal and transverse applied magnetic ¯elds.
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