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c) colloidal micro arrays on surfaces

In functional colloidal micro-arrays on surfaces, We utilize the functionality and the topography of the particle arrays on surfaces to develop opto-electronic devices, photonic band gap materials, and biochip devices and sensors.  Here the precise positioning of colloidal particles in complex two- and three- dimensional structures has attracted a great deal of attention for potential applications described above.  A number of methods have been successfully used to direct the assembly of colloidal particles onto patterned surfaces.  One is flow-induced packing into cavities of controlled dimensions and shape to create highly ordered particle arrays with precise cluster sizes.  Another is assembly at air-water interface and adsorption on self-assembled monolayers (SAMs) with alternately charged regions formed via micro-contact printing (mCP).  A surface templating approach is attractive as it allows the use of a simple processing step on a planar surface to direct colloid deposition. The surfaces used for traditional self-assembled monolayers (SAMs) are often restricted to metal and metal oxide surfaces.   The ability to use common flexible polymer substrates without metallization or other surface treatments can be greatly limited for these reasons.  Further, arrays templated via physisorption on SAMs surfaces are often not stable to mechanical shear or handling due to limited adhesion at the interface.

Figure 4. Controlled cluster size in 2-D colloidal microarrays on patterned polyelectrolyte platforms [ref. 4].

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