Effects of the Biosurfactant Rhamnolipid on the hygroscopicity and cloud condensation nuclei activity (CCN) of ammonium sulfate aerosols - Wenxu Fang; Zhijun Wu; Taomou Zong; Yanting Qiu; Xiangxinyue Meng; Jingchuan Chen; Zeyu Feng; Junrui Wang; Linghan Zeng; Zheng Chen; Zirui Zhang; Yu Xie; et al. (Atmospheric Research, 2026)