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Shear-induced 1-D alignment of alumina nanoparticles in coatings

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Abstract

Atomic Force Microscopy and Scanning Electron Microscopy were used to study shear-induced alignment of alumina and silica nanoparticles in two-component polyurethane clear coatings. 1-D strings of nanoparticles, formed in an extended pearl-necklace fashion were observed near the surfaces of cured films at nanoparticle volume fractions less than 0.05. This alignment is affected by the shear conditions of the application method. When applied by spraying, linear particle strings as long as 5 cm were observed in the direction of shear. Nanoparticle strings were also found, to a lesser extent, when coatings were applied by a drawdown method. The phenomenon was not observed in coatings applied with minimal shear. These particle string formations, in addition to affecting the performance of coatings, may have broader implications in the field of nanomaterials. Our literature searches so far have not uncovered reports of stable, 1-D nanoparticle arrangements with same degree of linearity produced under simple shear with compositions having very low particle loadings.

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Acknowledgments

The authors would like to acknowledge Cal Poly State University’s Bill Moore Endowment for financial support and BYK-Chemie Company for providing the nanoparticle samples used in this study.

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Authors and Affiliations

  1. Polymers and Coatings Program, Department of Chemistry and Biochemistry, California Polytechnic State University, San Luis Obispo, CA, 93407, USA

    Lucas J. Brickweg, Bryce R. Floryancic, Erik D. Sapper & Raymond H. Fernando

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  1. Lucas J. Brickweg
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  2. Bryce R. Floryancic
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  3. Erik D. Sapper
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  4. Raymond H. Fernando
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Corresponding author

Correspondence to Raymond H. Fernando.

Additional information

Presented at the 2006 FutureCoat! conference, sponsored by the Federation of Societies for Coatings Technology, in New Orleans, LA, on November 1–3, 2006.

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Brickweg, L.J., Floryancic, B.R., Sapper, E.D. et al. Shear-induced 1-D alignment of alumina nanoparticles in coatings. J Coat Technol Res 4, 107–110 (2007). https://doi.org/10.1007/s11998-007-9002-7

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  • DOI: https://doi.org/10.1007/s11998-007-9002-7

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