Supporting Information for Electrostatic Self-Assembly of Polystyrene Microspheres Using Chemically-Directed Contact Electrification
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Electrostatic self-assembly of polystyrene microspheres by using chemically directed contact electrification.
Herein we describe a process—based on contact electrification and electrostatic interactions—that directs the selfassembly of chemically modified polystyrene microspheres to form three-dimensional microstructures. When two solid surfaces are brought into contact and separated, charge is often transferred from one surface to the other in a process known as contact electrification. 2] We can pred...
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Contact electrification measurements using atomic force microscopy techniques were performed using micrometer-sized spheres made of polystyrene and flat substrates of either freshly cleaved, highly oriented pyrolytic graphite ~HOPG! or a 0.2-mm-thick Au@111# film grown on mica. The polystyrene/HOPG interaction exhibited significant electrostatic charging when compared to the polystyrene/Au syst...
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This paper describes the fabrication and characterization of ionic electrets-materials that bear a long-lived electrostatic charge because of an imbalance between the number of cationic and anionic charges in the material. Crosslinked polystyrene microspheres that contain covalently bound ions and mobile counterions transfer some of their mobile ions in air, in the absence of bulk liquid, to an...
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Self-assembly of components larger than molecules into ordered arrays is an efficient way of preparing microstructured materials with interesting mechanical and optical properties. Although crystallization of identical particles or particles of different sizes or shapes can be readily achieved, the repertoire of methods to assemble binary lattices of particles of the same sizes but with differe...
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Hexagonally ordered arrays of polystyrene (PS) microspheres were prepared by a modified air-water self-assembly method. A detailed analysis of the air-water interface self-assembly process was conducted. Several parameters affect the quality of the monolayer colloidal crystals, i.e., the colloidal microsphere concentration on the latex, the surfactant concentration, the polystyrene microsphere ...
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تاریخ انتشار 2006