Crack formation and prevention in colloidal drops

Crack formation is a frequent result of residual stress release from colloidal films made by the evaporation of colloidal droplets containing nanoparticles. Crack prevention is a significant task in industrial applications such as painting and inkjet printing with colloidal nanoparticles. Here, we i...

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Bibliographic Details
Published in:Scientific reports 2015-08, Vol.5 (1), p.13166-13166, Article 13166
Main Authors: Kim, Jin Young, Cho, Kun, Ryu, Seul-a, Kim, So Youn, Weon, Byung Mook
Format: Article
Language:English
Subjects:
639/301/923/614
639/301/923/916
639/766/189
Colloids
Drying
Evaporation
Gelation
Humanities and Social Sciences
Industrial applications
multidisciplinary
Nanoparticles
Particle size
Polymers
Prevention
Printing
Science
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Summary:Crack formation is a frequent result of residual stress release from colloidal films made by the evaporation of colloidal droplets containing nanoparticles. Crack prevention is a significant task in industrial applications such as painting and inkjet printing with colloidal nanoparticles. Here, we illustrate how colloidal drops evaporate and how crack generation is dependent on the particle size and initial volume fraction, through direct visualization of the individual colloids with confocal laser microscopy. To prevent crack formation, we suggest use of a versatile method to control the colloid-polymer interactions by mixing a nonadsorbing polymer with the colloidal suspension, which is known to drive gelation of the particles with short-range attraction. Gelation-driven crack prevention is a feasible and simple method to obtain crack-free, uniform coatings through drying-mediated assembly of colloidal nanoparticles.
ISSN:2045-2322
2045-2322
DOI:10.1038/srep13166