Response of colloidal liquids containing magnetic holes of different volume densities to magnetic field characterized by transmission measurement

doi:10.1088/1674-1056/19/10/107503

Abstract This paper systematically investigates the response of colloidal liquids containing magnetic holes of different volume densities to magnetic field by conventional transmission measurements. It finds that the enhancement in the transmission of such a colloidal liquid under a magnetic field exhibits a strong dependence on the volume density of magnetic holes. A linear increase in the maximum enhancement factor is observed when the volume density of magnetic holes is below a critical level at which a maximum enhancement factor of ～150 is achieved in the near infrared region. Once the volume density of magnetic holes exceeds the critical level, a sharp drop of the maximum enhancement factor to ～2 is observed. After that, the maximum enhancement factor increases gradually till a large volume density of ～9%. By monitoring the arrangement of magnetic holes under a magnetic field, it reveals that the colloidal liquids can be classified into three different phases, i.e., the gas-like, liquid-like and solid-like phases, depending on the volume density of magnetic holes. The response behaviour of colloidal liquids to magnetic field is determined by the interaction between magnetic holes which is governed mainly by their volume density. A phase transition, which is manifested in the dramatic reduction in the maximum enhancement factor, is clearly observed between the liquid-like and solid-like phases. The optical switching operations for colloidal liquids in different phases are compared and the underlying physical mechanisms are discussed.

Keywords: magnetic holes phases change optical switching operations

Received: 02 February 2010
Revised: 20 April 2010
Accepted manuscript online:

PACS:	75.50.Mm	(Magnetic liquids)
	75.60.Ej	(Magnetization curves, hysteresis, Barkhausen and related effects)
	82.70.Dd	(Colloids)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 10974060 and 10774050), the Program for Innovative Research Team of the Higher Education of Guangdong Province of China (Grant No. 06CXTD005) and President Foundation of South China Agricultural University (Grant No. 2009K018).

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Deng Hai-Dong(邓海东), Sun Ting(孙婷), Zhao Wei-Ren(赵韦人), Fu Zhi-Cheng(符志成), Dai Qiao-Feng(戴峭峰), Wu Li-Jun(吴立军), Lan Sheng(兰胜), and Achanta Venu Gopal Response of colloidal liquids containing magnetic holes of different volume densities to magnetic field characterized by transmission measurement 2010 Chin. Phys. B 19 107503

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Response of colloidal liquids containing magnetic holes of different volume densities to magnetic field characterized by transmission measurement

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