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首页> 外文期刊>Journal of Physical and Chemical Reference Data >Correlations for vapor nucleating critical embryo parameters
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Correlations for vapor nucleating critical embryo parameters

机译：蒸汽成核关键胚胎参数的相关性

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Condensation nucleation light scattering detection in principle works by converting the effluent of the chromatographic separation into an aerosol and then selectively evaporating the mobile phase, leaving less volatile analytes and nonvolatile impurities as dry aerosol particles. The dry particles produced are then exposed to an environment that is saturated with the vapors of an organic solvent (commonly n-butanol). The blend of aerosol particles and organic vapor is then cooled so that conditions of vapor supersaturation are achieved. In principle, the vapor then condenses onto the dry particles, growing each particle (ideally) from as small as a few nanometers in diameter into a droplet with a diameter up to about 10 mum. The grown droplets are then passed through a beam of light, and the light scattered by the droplets is detected and used as the detector response. This growth and detection step is generally carried out using commercial continuous-flow condensation nucleus counters. In the present research, the possibility of using other fluids than the commonly used n-butanol is investigated. The Kelvin equation and the Nucleation theorem [Anisimov (1978)] are used to evaluate a range of fluids for efficacy of growing small particles by condensation nucleation. Using the available experimental data on vapor nucleation, the correlations of Kelvin diameters (the critical embryo sizes) and the bulk surface tension with dielectric constants of working liquids are found. A simple method for choosing the most efficient fluid, within a class of fluids, for growth of small particles is suggested. (C) 2003 American Institute of Physics. [References: 76]
机译：冷凝成核光散射检测原则上是通过将色谱分离的流出物转化为气溶胶，然后选择性地蒸发流动相而工作的，剩下的挥发性分析物和非挥发性杂质较少，为干燥的气溶胶颗粒。然后将产生的干燥颗粒暴露于有机溶剂（通常为正丁醇）蒸汽饱和的环境中。然后将气溶胶颗粒和有机蒸气的混合物冷却，以便达到蒸气过饱和的条件。原则上，蒸汽然后凝结在干燥的颗粒上，使每个颗粒（理想情况下）从直径小至几纳米长成直径最大为10微米的液滴。然后使生长的液滴穿过光束，并检测由液滴散射的光并将其用作检测器响应。该生长和检测步骤通常使用商业连续流凝结核计数器进行。在本研究中，研究了使用除常用正丁醇以外的其他液体的可能性。开尔文方程和成核定理[Anisimov（1978）]用于评估一系列流体通过凝结成核生长小颗粒的功效。使用有关蒸汽成核的可用实验数据，发现开尔文直径（临界胚胎尺寸）和体表张力与工作液体介电常数之间的相关性。建议一种简单的方法来选择一类流体中最有效的流体来生长小颗粒。 （C）2003美国物理研究所。 [参考：76]

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