The news reporters obtained a quote from the research, "Monodisperse, nanosuspension sessile drops formed a variety of patterns, at the macro-scale, consisting of sets of rings, concentric rings and irregularly distributed stains. 'Stick-slip' motion of the triple line (TL), constantly pinned TL and very rapid evolution of the evaporation were the reasons for each of the observed patterns respectively. At the particle level (nano-scale), the promotion of close-packed, hexagonal particle structures was observed as a result of the enhanced evaporation rate and hence increased particle velocity. Beyond an optimal/critical pressure, a combination of further enhanced particle velocity with very limited space (for particles to find their most thermodynamically favourable positions) led to the formation of a disordered region at the exterior region and, as expected, to more defects. Lastly, inside the rings, particles formed random groups of particle aggregates, resembling branches, following TL motion during the 'slip' phase. On the other hand, particle structures resembling ripples formed on top of a particle monolayer with increasing surface coverage as pressure was reduced."
According to the news reporters, the research concluded: "This was a direct result of fluid flow being too weak to reach the TL but strong enough to carry particles over smaller distances during the last stages of the evaporation process."
For more information on this research see: The effect of evaporation kinetics on nanoparticle structuring within contact line deposits of volatile drops. Colloids and Surfaces A-Physicochemical and Engineering Aspects, 2014;441():855-866. Colloids and Surfaces A-Physicochemical and Engineering Aspects can be contacted at: Elsevier Science Bv, PO Box 211, 1000 Ae
Our news correspondents report that additional information may be obtained by contacting A. Askounis, Arts & Metiers ParisTech, I2M, UMR 5295, F-33400 Talence,
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Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC
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