Water Evaporation from Acoustically Levitated Aqueous Solution Droplets,The Journal of Physical Chemistry A

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Water Evaporation from Acoustically Levitated Aqueous Solution Droplets
The Journal of Physical Chemistry A ( IF 2.7 ) Pub Date : 2017-09-13 00:00:00 , DOI: 10.1021/acs.jpca.7b08050
Nicole A. Combe ₁ , D. James Donaldson _{1,

2}

Affiliation

We present a systematic study of the effect of solutes on the evaporation rate of acoustically levitated aqueous solution droplets by suspending individual droplets in a zero-relative humidity environment and measuring their size as a function of time. The ratios of the early time evaporation rates of six simple salts (NaCl, NaBr, NaNO₃, KCl, MgCl₂, CaCl₂) and malonic acid to that of water are in excellent agreement with predictions made by modifying the Maxwell equation to include the time-dependent water activity of the evaporating aqueous salt solution droplets. However, the early time evaporation rates of three ammonium salt solutions (NH₄Cl, NH₄NO₃, (NH₄)₂SO₄) are not significantly different from the evaporation rate of pure water. This finding is in accord with a previous report that ammonium sulfate does not depress the evaporation rate of its solutions, despite reducing its water vapor pressure, perhaps due to specific surface effects. At longer evaporation times, as the droplets approach crystallization, all but one (MgCl₂) of the solution evaporation rates are well described by the modified Maxwell equation.

中文翻译：

声悬浮水溶液中的水蒸发

我们通过悬浮零相对湿度环境中的单个液滴并测量其大小随时间的变化，对溶质对声悬浮水溶液液滴的蒸发速率的影响进行了系统的研究。六种简单盐（NaCl，NaBr，NaNO ₃，KCl，MgCl ₂，CaCl ₂）和丙二酸的早期蒸发速率与水的蒸发速率之比与通过修改麦克斯韦方程将其包括在内的预测值非常一致蒸发的盐水溶液小滴的时间依赖性水活度。但是，三种铵盐溶液（NH ₄ Cl，NH ₄ NO ₃，（NH ₄）₂ SO ₄）与纯水的蒸发速率没有显着差异。这一发现与先前的报告一致，尽管可能由于特定的表面效应，尽管硫酸铵降低了水蒸气压力，但它并未降低其溶液的蒸发速率。在更长的蒸发时间下，随着液滴接近结晶，通过修正的麦克斯韦方程很好地描述了溶液蒸发速率中只有一个（MgCl ₂）。

更新日期：2017-09-14

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