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Monday, 14 October 2019
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Raw materials & technologies, Technologies, Functional coatings

IR radiative heating creates topographic hard films

Thursday, 8 December 2011

Recently, a new processing method, called infrared radiation-assisted sintering (IRAS), was demonstrated to be an effective means of processing hard latex films

IR radiative heating creates topographic hard films Source: Denis Babenko - Fotolia.com

IR radiative heating creates topographic hard films Source: Denis Babenko - Fotolia.com

The topography or texture of a surface —at the micrometre and nanometre length scales—has a profound influence on its properties. A team of researcher form the Surrey Materials Institute, BP Institute and Akzo Nobel Decorative, all in UK, created polymer coatings with periodic topographic patterns, repeating over millimetre length scales from lateral flows in an aqueous dispersion of colloidal particles. The flow is driven by differences in evaporation rate across the wet film surface created by IR radiative heating through a shadow mask. This new process, which the researcher call IR radiation-assisted evaporative lithography (IRAEL), combines IR particle sintering with the concept of evaporative lithography. They show that the height of the surface features increases with an increase in several key parameters: the initial thickness of the film, the volume fraction of particles, and the pitch of the pattern. The results are interpreted by using models of geometry and particle transport. The patterned coatings can function as "paintable" microlens arrays, applicable to nearly any surface. Compared with existing methods for creating textured coatings, IRAEL is simpler, inexpensive, able to create a wide variety of bespoke surfaces, and applicable to nearly any substrate without prior preparation.
Published on 13 October 2011 under doi 10.1039/C1SM06527K here

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