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Thursday, 09 July 2020
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Raw materials & technologies, Technologies, Nanotechnology

Characterising cellulose nanocrystals dispersion in varnishes

Tuesday, 28 July 2015

Cellulose nanocrystals were mixed into an aqueous UV-cured coating formulation in order to improve the mechanical properties of a coating.

A characterisation method based on atomic force microscopy (AFM) and backscattering of laser light is applied to characterise nanocomposite coatings. Source: Peter Eggermann/Fotolia
A characterisation method based on atomic force microscopy (AFM) and backscattering of laser light is applied to characterise nanocomposite coating...

One of the key aspects in the technology of nanocomposites remains the dispersion of the nanoparticles within the matrix. To quantify the dispersion, efficient methods of characterisation are needed.

Method can be used in quality control

In this study, a new characterisation method based on atomic force microscopy (AFM) and backscattering of laser light (He–Ne 632.8 nm) is applied to characterise such nanocomposite coatings. The angular distribution of backscattered light intensity was approximated by Gaussian distribution, and its standard deviation was used for the surface roughness analyses. A strong correlation between surface nano-roughness of coatings and angular distribution (half-width of the angular spread) of backscattered laser light was found. This laser characterisation is faster and may be done without direct contact over a wider surface than AFM and may give us an idea about mechanical properties of coatings. This method can advance our fundamental understanding of dispersion of the nanoparticles in coatings and could be of use in quality control in industry.

The study is published in: Journal of Coatings Technology and Research, July 2015, Volume 12, Issue 4, pp 647-656.

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