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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Uptake of Pyrene onto Fatty Acid Coated NaCl Aerosol Particles
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Uptake of Pyrene onto Fatty Acid Coated NaCl Aerosol Particles

机译：Fat在脂肪酸包覆的NaCl气溶胶颗粒上的吸收

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摘要

Photoelectric charging experiments monitor the uptake of pyrene onto NaCl aerosol particles coated with either 6 oleic acid or myristic acid. In both cases, thin coatings produce a small net decrease in pyrene uptake. In the larger coverage limit, the uptake of the myristic acid coated particles remains nearly constant whereas the oleic acid coated particles exhibit greater uptake rates than the bare NaCl particles. Fitting the results with a multilayer kinetic model yields uptake rate coefficients as well as parameters that describe the distribution of organic molecules on the aerosol particle surface. The model accounts for the decrease in uptake associated with thin coatings of oleic acid through a concomitant reduction in surface area. The adsorption rate constants for the myristic and oleic acid coated surfaces are 50 and 80 times faster, respectively, than for NaCl. The desorption rates for pyrene on the fatty acid surfaces are faster, as well. For myristic acid coatings, the fast desorption (over 400 times the rate of desorption from NaCl) results in slower net adsorption, whereas for oleic acid (approximately 12 times the desorption rate from NaCl), the net uptake rate increases with coverage. The results also suggest that both myristic acid and oleic acid spread incompletely on the aerosol surfaces under the conditions of these experiments. In the optimized kinetic model, the fatty acids cover approximately 50% of the surface when the nominal coating thickness is approximately 6 nm. The surface is over 90% covered with a nominal coating thickness of 20 nm, which is approximately 10% of particle diameter in these experiments. Very thin oleic acid coatings reduce the surface area of particles consistent with the preferential coverage of highly corrugated or porous regions.
机译：光电充电实验监测monitor在涂有6油酸或肉豆蔻酸的NaCl气溶胶颗粒上的吸收。在这两种情况下，薄涂层都会使net的吸收量有所减少。在更大的覆盖范围内，肉豆蔻酸涂覆的颗粒的吸收几乎保持恒定，而油酸涂覆的颗粒比裸露的NaCl颗粒具有更高的吸收率。用多层动力学模型拟合结果会产生吸收速率系数以及描述有机分子在气溶胶颗粒表面分布的参数。该模型解释了通过同时减少表面积来减少与油酸薄涂层相关的吸收。肉豆蔻酸和油酸涂层表面的吸附速率常数分别比NaCl快50倍和80倍。 pyr在脂肪酸表面的解吸速率也更快。对于肉豆蔻酸涂层，快速脱附（超过NaCl脱附速率的400倍）导致较慢的净吸附，而对于油酸（大约是NaCl脱附速率的12倍），净吸收速率随覆盖率而增加。结果还表明，在这些实验条件下，肉豆蔻酸和油酸均未完全散布在气溶胶表面上。在优化的动力学模型中，当标称涂层厚度约为6 nm时，脂肪酸约覆盖表面的50％。该表面被90％以上的涂层覆盖，其标称涂层厚度为20 nm，在这些实验中约为颗粒直径的10％。非常薄的油酸涂层会减少颗粒的表面积，这与高度波纹或多孔区域的优先覆盖区一致。

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