title: A magnetically tunable colloidal crystal film for reflective display.
abstract: A general approach to fabricate a magnetic field responsive colloidal crystal film has been developed. This is carried out by depositing monodisperse Fe(3) O(4) /PS composite magnetic nanospheres on the surface of an agarose-gel coated substrate. The optical properties of the resultant film can be easily controlled by an external magnetic field, which is caused by assembly of the magnetic nanospheres and alteration of the interparticle distance. With the help of a designed array of small magnets, both the color and pattern of the film can be conveniently modulated and the tuning range covers almost the whole visible spectrum. This work will be important for the potential application of monodisperse magnetic nanospheres in fabricating novel sensors, displays and optoelectronic devices.
authors.affiliation: State Key Laboratory of Bioelectronics, Southeast University, Nanjing 210096, P. R. China; School of Chemistry and Chemical Engineering, Southeast University, Nanjing 210096, P. R. China.
authors.forename: Cun
authors.initials: C
authors.lastname: Zhu
authors.forename: Liangshui
authors.initials: L
authors.lastname: Chen
authors.forename: Hua
authors.initials: H
authors.lastname: Xu
authors.forename: Zhongze
authors.initials: Z
authors.lastname: Gu