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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Hygroscopic Growth and Deliquescence of NaCI Nanoparticles Coated with Surfactant AOT
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Hygroscopic Growth and Deliquescence of NaCI Nanoparticles Coated with Surfactant AOT

机译：表面活性剂AOT包覆的NaCl纳米粒子的吸湿生长和潮解

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摘要

Aerosolized nanoparticles of NaCl coated with variable amounts of surfactant AOT were generated by electrospraying AOT/NaCl aqueous solutions, followed by neutralizing and drying the resulting particles. A tandem differential mobility analyzer was used to select a narrow size distribution of particles with mobility equivalent diameters below 20 nm and monitor their hygroscopic growth as a function of relative humidity. Effects of the particle size and relative amount of surfactant on the hygroscopic growth of NaCI were studied. For pure NaCl nanoparticles, the deliquescence relative humidity (DRH) increased as the particle size was decreased, in full agreement with previous measurements. Below the DRH the NaCl nanoparticles had an equivalent of one— four monolayers of water adsorbed on the surface. The addition of a sub-monolayer AOT coating reduced the DRH and suppressed the hygroscopic growth of the NaCl core. At AOT coverage levels exceeding one monolayer, a clear deliquescence transition was no longer discernible. The Zdanovskii—StokesRobinson (ZSR) model failed to predict the observed growth factors of mixed AOT/NaCl nanoparticles reflecting a large contribution of the interfacial interactions between NaCl and AOT to the total free energy of the particles. There were indications that AOT/NaCl nanoparticles prepared by the electrospray aerosol source were enhanced in the relative mass fraction of AOT in comparison with the solution from which they were electrosprayed.
机译：通过电喷雾AOT / NaCl水溶液，然后中和并干燥所得颗粒，可以生成涂有可变量表面活性剂AOT的NaCl气雾化纳米颗粒。串联差动迁移率分析仪用于选择迁移率当量直径低于20 nm的颗粒的窄尺寸分布，并监测其吸湿性随相对湿度的变化。研究了表面活性剂的粒径和相对量对NaCl吸湿性生长的影响。对于纯NaCl纳米颗粒，潮解相对湿度（DRH）随着粒径的减小而增加，与先前的测量完全一致。在DRH以下，NaCl纳米颗粒的表面相当于一到四个单层水吸附。添加亚单层AOT涂层可减少DRH，并抑制NaCl芯的吸湿性生长。在AOT覆盖水平超过一个单层的情况下，不再可以看到明显的潮解转变。 Zdanovskii-StokesRobinson（ZSR）模型无法预测观察到的混合AOT / NaCl纳米颗粒的生长因子，这反映了NaCl和AOT之间的界面相互作用对颗粒的总自由能的巨大贡献。有迹象表明，与电喷雾气溶胶源制备的AOT / NaCl纳米颗粒相比，电喷雾气溶胶源制备的AOT / NaCl纳米颗粒的AOT相对质量分数有所提高。

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