Institute of Physics of the Polish Academy of Sciences, 02-668 Warsaw, Poland.
J Phys Chem A. 2010 Mar 18;114(10):3483-8. doi: 10.1021/jp911466e.
Evaporation of motionless, levitating droplets of pure, low-volatility liquids was studied with interferometric methods. Experiments were conducted on charged droplets in the electrodynamic trap in nitrogen at atmospheric pressure at 298 K. Mono-, di-, tri-, and tetra(ethylene glycols) and 1,3-dimethyl-2-imidazolidinone were studied. The influence of minute impurities (<0.1%) upon the process of droplet evaporation was observed and discussed. The gas phase diffusion and evaporation coefficients were found from droplet radii evolution under the assumption of known vapor pressure. Diffusion coefficients were compared with independent measurements and calculations (in air). Good agreement was found for mono- and di(ethylene glycols), and for 1,3-dimethyl-2-imidazolidinone, which confirmed the used vapor pressure values. The value of equilibrium vapor pressure for tri(ethylene glycol) was proposed to be 0.044 +/- 0.008 Pa. The evaporation coefficient was found to increase from 0.035 to 0.16 versus the molecular mass of the compound.
利用干涉法研究了静止、悬浮的纯低挥发性液体液滴的蒸发。实验在大气压 298 K 下的氮中，在电动力学阱中对带电液滴进行。研究了单、二、三、四（乙二醇）和 1,3-二甲基-2-咪唑烷酮。观察并讨论了微量杂质（<0.1%）对液滴蒸发过程的影响。根据已知蒸气压假设，从液滴半径的演化中找到了气相扩散和蒸发系数。将扩散系数与独立测量和计算（在空气中）进行了比较。对于单（乙二醇）和二（乙二醇），以及 1,3-二甲基-2-咪唑烷酮，得到了很好的一致性，这证实了所使用的蒸气压值。提出了三（乙二醇）的平衡蒸气压值为 0.044 +/- 0.008 Pa。发现蒸发系数从 0.035 增加到 0.16，相对于化合物的分子量。
