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Efflorescence relative humidity for ammonium sulfate particles

机译:硫酸铵颗粒的风化相对湿度

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摘要

The classical homogeneous nucleation theory was employed to calculate the efflorescence relative humidity (ERH) of airborne ammonium sulfate particles with a wide size range (8 nm to 17 mu m) at room temperature. The theoretical predictions are in good agreement with the experimentally measured values. When the ammonium sulfate particle is decreased in size, the ERH first decreases, reaches a minimum around 30% for particle diameter equal to about 30 nm, and then increases. It is for the first time that the Kelvin effect is theoretically verified to substantially affect the ERH of ammonium sulfate particles smaller than 30 nm, while the aerosol size is the dominant factor affecting the efflorescent behavior of ammonium sulfate particles larger than 50 nm.
机译:采用经典的均相成核理论,计算了室温下宽尺寸范围(8nm至17μm)的机载硫酸铵颗粒的风化相对湿度(ERH)。理论预测与实验测量值非常吻合。当硫酸铵颗粒尺寸减小时,ERH首先减小,对于等于约30 nm的粒径,其最小值达到约30%,然后增大。首次从理论上证明了开尔文效应实质上影响小于30 nm的硫酸铵颗粒的ERH,而气溶胶尺寸是影响大于50 nm的硫酸铵颗粒的风化行为的主要因素。

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