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Aerosol impaction-driven assembly produces evenly dispersed nanoparticle coating on polymeric water treatment membranes

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Abstract

Nano-enabled water treatment membranes are finding new applications and commercial opportunities, but the commonly used methods for embedding or coating the membranes with nanoparticles have limitations. There is an increasing need for controllable and high-throughput methods for applying nanoparticles uniformly across membrane surfaces in ways that preserve their unique nano-properties while assuring stable attachment. We demonstrate proof-of-concept for the use of aerosol impaction-driven assembly (AIDA) to coat polymeric water treatment membranes. AIDA is a dry-coating technique that has been demonstrated on other substrates. It involves using a pressure differential to accelerate aerosolized (premade or in situ-formed) nanoparticles onto a moving sample. The nanoparticles stick by chemical bonding or van der Waals interactions. To provide a proof-of-concept and comparison with other techniques, PVDF membranes with 0.1 μm pore size were coated with functionalized 50-nm-diameter silver and gold nanoparticles using AIDA, spray-coating, and in situ synthesis, and then were characterized. The AIDA coating method produces controllable (i.e., proportional to deposition time) loadings of evenly dispersed, non-agglomerated nanoparticles on the membrane. The method is relatively agnostic to nanoparticle type. The loading efficiency varies with the surface functionality of the nanoparticles, but not their elemental composition. The method has no substantial effect on water flux and produces stable coatings with low nanoparticle release. The AIDA nanoparticle coating method is shown to have inherent flexibility, controllability, and other major advantages (i.e., dispersion, stability) in the quality of the coatings produced.

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Acknowledgments

Laurel Passantino provided technical editing.

Funding

This work was partially funded by the National Science Foundation Nanosystems Engineering Research Center on Nanotechnology-Enabled Water Treatment (NEWT) Cooperative Agreement ERC-1449500, the Engineering Research Center Program of the National Science Foundation and the Office of Energy Efficiency and Renewable Energy of the Department of Energy under NSF Cooperative Agreement EEC-1041895, and the US Environmental Protection Agency through the STAR program (RD83558001).

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Correspondence to Ariel J. Atkinson or Zachary C. Holman.

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The authors declare that they have no conflict of interest.

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This article is part of the topical collection: Nanotechnology Convergence in Africa, Guest Editors: Mamadou Diallo, Abdessattar Abdelkefi, and Bhekie Mamba

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Atkinson, A.J., Bi, Y., Firth, P. et al. Aerosol impaction-driven assembly produces evenly dispersed nanoparticle coating on polymeric water treatment membranes. J Nanopart Res 22, 102 (2020). https://doi.org/10.1007/s11051-020-04814-w

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  • DOI: https://doi.org/10.1007/s11051-020-04814-w

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