Abstract
Self-assembly1,2,3,4 of components larger than molecules into ordered arrays is an efficient way of preparing microstructured materials with interesting mechanical5,6 and optical7,8 properties. Although crystallization of identical particles9,10 or particles of different sizes11 or shapes12 can be readily achieved, the repertoire of methods to assemble binary lattices of particles of the same sizes but with different properties is very limited13,14. This paper describes electrostatic self-assembly15,16,17 of two types of macroscopic components of identical dimensions using interactions that are generated by contact electrification18,19,20. The systems we have examined comprise two kinds of objects (usually spheres) made of different polymeric materials that charge with opposite electrical polarities when agitated on flat, metallic surfaces. The interplay of repulsive interactions between like-charged objects and attractive interactions between unlike-charged ones results in the self-assembly of these objects into highly ordered, closed arrays. Remarkably, some of the assemblies that form are not electroneutral—that is, they possess a net charge. We suggest that the stability of these unusual structures can be explained by accounting for the interactions between electric dipoles that the particles in the aggregates induce in their neighbours.
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Acknowledgements
This work was supported by the Department of Energy (award 00ER45852). J.A.W. was supported by the Natural Sciences and Engineering Research Council of Canada. A.W. was supported by the Biophysics Training Grant. Y.B. was supported by the National Science Foundation. The authors would like to thank A. Epstein (The Ohio State University) for useful discussions.
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Grzybowski, B., Winkleman, A., Wiles, J. et al. Electrostatic self-assembly of macroscopic crystals using contact electrification. Nature Mater 2, 241–245 (2003). https://doi.org/10.1038/nmat860
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DOI: https://doi.org/10.1038/nmat860
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