the present invention relates to a systematic process for the creation of functionally organized , spatially patterned assemblies polymer - microparticle composites including the ac electric field - mediated assembly of patterned , self supporting organic films and organic - polymer - microparticle composites of tailored composition and morphology . the present invention further relates to the incorporation of said assemblies into other structures . the present invention . also relates to the application of such functional assemblies in materials science and biology . additional areas of application include sensors , catalysts , membranes , and micro - reactors , and miniaturized format for generation of multifunctional thin films . this invention also provides simple methods and apparatus for synthesizing thin films of tailored composition and morphology :