15 , 25 During the post-deliquescence stage, Δ f showed an increasing trend with RH and might reach a stable value under the applied condition.
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Water Adsorption vs Phase Transition of Aerosols Monitored by a Quartz Crystal Microbalance.
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The sentences
In the RH decreasing cycle where the efflorescence occurred, Δ f showed a gradually decreasing trend first, then a sudden drop phenomenon, and a slightly increasing trend afterward.