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Issue 36, 2009
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Measurements and simulations of the near-surface composition of evaporating ethanolwater droplets

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Abstract

The evolving composition of evaporating ethanolwater droplets (initially 32.6 or 45.3 μm radius) is probed by stimulated Raman scattering over the period 0.2 to 3 ms following droplet generation and with a surrounding nitrogen gas pressure in the range 10 to 100 kPa. The dependence of the evaporation rate on the relative humidity of the surrounding gas phase is also reported. The measured data are compared with both a quasi-steady state model and with numerical simulations of the evaporation process. Results from the numerical simulations are shown to agree closely with the measurements when the stimulated signal is assumed to arise from an outer shell with a probe depth of 2.9 ± 0.4% of the droplet radius, consistent with a previous determination. Further, the time-dependent measurements are shown to be sensitive to the development of concentration gradients within evaporating droplets. This represents the first direct measurement of the spatial gradients in composition that arise during the evaporation of aerosol droplets and allows the influence of liquid phase diffusion within the condensed phase on droplet evaporation to be examined.

Graphical abstract: Measurements and simulations of the near-surface composition of evaporating ethanol–water droplets

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Publication details

The article was received on 26 Feb 2009, accepted on 07 May 2009 and first published on 03 Jun 2009


Article type: Paper
DOI: 10.1039/B904070F
Citation: Phys. Chem. Chem. Phys., 2009,11, 7780-7791
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    Measurements and simulations of the near-surface composition of evaporating ethanolwater droplets

    C. J. Homer, X. Jiang, T. L. Ward, C. J. Brinker and J. P. Reid, Phys. Chem. Chem. Phys., 2009, 11, 7780
    DOI: 10.1039/B904070F

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