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Chinese Science Bulletin

, Volume 57, Issue 6, pp 591–594

First Online: 03 January 2012Received: 09 May 2011Accepted: 14 September 2011

Abstract

Morphological changes with decreasing relative humidity RH of supersaturated sea-salt aerosol droplets on a quartz substrate were observed using a high-speed video-camera. Stable gypsum CaSO4·2H2O or the metastable hemihydrate CaSO4·0.5H2O were precipitated as the RH decreased. The dynamic process of crystal growth under steady-state humidity was studied by controlling the RH; the metastable hemihydrate was precipitated at 70.5%–77.1% RH, and the apparent crystal growth rate was between 1.42 and 2.33 μm-s. Stable gypsum was formed at 80.7%–82.2% RH, and the apparent crystal growth rate was between 0.70 and 0.81 μm-s.

Keywordshigh-speed photography sea-salt aerosols crystallization dynamics This article is published with open access at Springerlink.com

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Autor: ZhengGang Qian - Feng Wang - YuXia Zheng - JunYing Yu - YunHong Zhang

Fuente: https://link.springer.com/article/10.1007/s11434-011-4907-z







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