Requirements for the Formation and Shape of Microscopic Precursors in Droplet Spreading
| العنوان: | Requirements for the Formation and Shape of Microscopic Precursors in Droplet Spreading |
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| المؤلفون: | Ahmed E. Ismail, Rolf E. Isele-Holder |
| المصدر: | Langmuir. 32:4472-4478 |
| بيانات النشر: | American Chemical Society (ACS), 2016. |
| سنة النشر: | 2016 |
| مصطلحات موضوعية: | Mass transport, Work (thermodynamics), 010304 chemical physics, Chemistry, Nanotechnology, 02 engineering and technology, Surfaces and Interfaces, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Physics::Geophysics, Molecular dynamics, Chemical physics, 0103 physical sciences, Monolayer, Electrochemistry, General Materials Science, 0210 nano-technology, Layer (electronics), Spectroscopy |
| الوصف: | While the mass transport mechanisms and dynamics of molecular precursors, ultrathin films that precede spreading droplets, are well understood, the requirements for their formation and the reasons for the occurrence of different precursor shapes remain unclear. In this work, we study these requirements using molecular dynamics simulations of spreading droplets and extensive free energy computations. For a simple simulation model, we demonstrate that with growing droplet-substrate attraction, spreading passes succesively through regimes with no precursor, a monolayer precursor, and a continuously growing precursor. We show that the onset of layer formation and the changes in the precursor shape correlate with the free energy of layer formation. On the basis of these findings, we show that a positive spreading coefficient is sufficient but not necessary for precursor formation. |
| تدمد: | 1520-5827 0743-7463 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a3a32dbfd8a6b28d775470b75942302e https://doi.org/10.1021/acs.langmuir.6b00807 |
| رقم الأكسشن: | edsair.doi.dedup.....a3a32dbfd8a6b28d775470b75942302e |
| قاعدة البيانات: | OpenAIRE |
Find this issue from the American Chemical Society | تدمد: | 15205827 07437463 |
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