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Honolulu, HI, United States, 2006/09/08 - Colloidal crystals constructed by monodispersed microspheres packed in ordered arrays represent a new class of advanced materials that are useful in many areas.
For example, due to their novel light diffraction and photonic bandgap properties, colloidal crystals are promising elements in the fabrication of devices such as optical filters and switches, chemical and biochemical sensors, and photonic chips. Various self-assembly techniques have been developed to form colloidal crystals on different substrates, including the flow-cell methods, vertical deposition, micromolding in capillaries and so on. Although existing methods can provide colloidal crystals of different structures and quality, efficient approaches to high stability and large scale colloidal crystals are increasingly attracting attention. Generating ordered microstructures in the colloidal crystal films and colloidal crystals with different structures and configurations are particularly important in the fabrication of optical devices.
Professor Bai Yang, director of the The Key Laboratory for Supramolecular Structure and Materials of Ministry of Education at Jilin University/PR China, and his group have developed a number of methods to organize polymeric, inorganic, even composite microspheres into various structures, generating various properties and functions.
"Using these methods" Yang explains to Nanowerk, "we prepared various colloidal crystals with different structures. These included colloidal crystals with ordered voids and two- or three-dimensional (2D or 3D) patterned arrays, colloidal crystals on non-planar surfaces, heterogeneous colloidal crystals of different building blocks, colloidal crystals composed of non-spherical polyhedrons, and particularly colloidal crystals of non-close-packed (ncp) colloidal microspheres."
Read the full article on the Nanowerk website.
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By Michael Berger, Copyright 2006 Nanowerk LLC