Transport of Mass at the Nanoscale during Evaporation of Droplets: the Hertz–Knudsen Equation at the Nanoscale

Autor:	Marek Litniewski, M. Zientara, Daniel Jakubczyk, Robert Hołyst
Rok vydání:	2013
Předmět:	Surface (mathematics) Tension (physics) Chemistry Evaporation Thermodynamics Evaporation coefficient Surfaces Coatings and Films Electronic Optical and Magnetic Materials Surface tension Knudsen equation Molecular dynamics General Energy Physical and Theoretical Chemistry Nanoscopic scale
Zdroj:	The Journal of Physical Chemistry C. 117:1146-1150
ISSN:	1932-7455 1932-7447
DOI:	10.1021/jp3091478
Popis:	The applicability of the Hertz–Knudsen equation to the evolution of droplets at the nanoscale was investigated upon analysis of existing molecular dynamics (MD) simulations ( Holyst; Phys. Rev. Lett. 2008, 100, 055701; Yaguchi; J. Fluid Sci. Technol. 2010, 5, 180–191; Ishiyama; Phys. Fluids 2004, 16, 2899–2906). The equation was found satisfactory for radii larger than ∼4 nm. Concepts of the Gibbs equimolecular dividing surface and the surface of tension were utilized in order to accommodate the surface phase density and temperature profiles, clearly manifesting at the nanoscale. The equimolecular dividing surface was identified as the surface of the droplet. A modification to the Tolman formula was proposed in order to describe surface tension for droplet radii smaller than ∼50 nm. We assumed that the evaporation coefficient for a system in and out of equilibrium may differ. We verified that this difference might be attributed to surface temperature change only. The empirical dependencies of the evaporat...
Databáze:	OpenAIRE
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