Colloidal crystal is one kind of photonic band gap material which can self-assemble into ordered periodical structure and has the ability to reflect some definite light to make the colloidal crystal brilliant. Especially photonic crystals with magnetic properties have received much attention in recent years because of their good responsibility to the external magnetic field. This novel kind of material has potential applications not only in traditional separation, purification of biomolecules and drug delivery system, but also in optical devices and sensors.
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