Abstract
As engineers strive to mimic the form and function of naturally occurring materials with synthetic alternatives, the challenges and costs of processing often limit creative innovation. Here we describe a powerful yet economical technique for developing multiple coatings of different morphologies and functions within a single textile membrane, enabling scientists to engineer the properties of a material from the nanoscopic level in commercially viable quantities. By simply varying the flow rate of charged species passing through an electrospun material during spray-assisted layer-by-layer deposition, individual fibres within the matrix can be conformally functionalized for ultrahigh-surface-area catalysis, or bridged to form a networked sublayer with complimentary properties. Exemplified here by the creation of selectively reactive gas purification membranes, the myriad applications of this technology also include self-cleaning fabrics, water purification and protein functionalization of scaffolds for tissue engineering.
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Acknowledgements
This research was supported in part by the US Army through the Institute for Soldier Nanotechnologies under contract DAAD-19-02-0002 with the US Army Research Office, and by the G. Nicholas and Dorothea K. Dumbros Scholarship and Fellowship Fund. The content does not necessarily reflect the position of the government, and no official endorsement should be inferred. The authors would like to thank H. Schreuder-Gibson and P. Gibson of the US Army Soldier Systems Center for assistance with water-vapour permeation testing.
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Krogman, K., Lowery, J., Zacharia, N. et al. Spraying asymmetry into functional membranes layer-by-layer. Nature Mater 8, 512–518 (2009). https://doi.org/10.1038/nmat2430
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DOI: https://doi.org/10.1038/nmat2430
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