首页|Surface tension of single suspended aerosol microdroplets
Surface tension of single suspended aerosol microdroplets
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The surface tension of troposphere aerosols can significantly influence their atmospheric processes and key properties,particularly on the morphology,the phase transition,the activation as cloud condensa-tion nuclei,and the gas-particle partitioning.However,directly measuring the surface tension of single ambient aerosol is quite challenging,due to the limitations of their picolitre volumes and thermal mo-tion.Here,we developed a dual laser tweezers Raman spectroscopy(DLT-RS)system to directly sense the surface tension of single airborne microdroplets(PM10 particles).A pair of aerosol droplets were trapped and driven to coalesce by the laser tweezers.Meanwhile,the backscattering light intensity and bright-field images during the coalescence process were recorded to characterize the aerosol surface tension.A remarkable advantage of directly sensing aerosol surface tension is that the solutes in aerosols are of-ten supersaturated,which is common in atmospheric aerosols but almost unavailable in bulk solutions.We experimentally measured the surface tension of aerosols composed of nitrates or oxalic acid/nitrate mixture.Besides,the variation of surface tension during aerosol aging process was also explored,which brings possible implications on the surface evolution of actual ambient aerosol during their atmospheric lifetime.
Key Laboratory for the Physics and Chemistry of Nanodevices,School of Electronics,Peking University,Beijing 100871,China
State Key Joint Laboratory of Environmental Simulation and Pollution Control,College of Environmental Sciences and Engineering,Peking University,Beijing 100871,China
Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100094,China
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