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oai:figshare.com:article/34047267 2026-10-01T17:09:56Z category_915 category_8 category_24 category_69 category_113 category_132 category_135 portal_63 item_type_6 month_year_10_2026

Continuous Single-Droplet Tracking Reveals Scaling Laws of Surface-Confined Mn(II)-Catalyzed SO₂ Oxidation Xiaowu Zhang (575737) Jiuyi Sun (753371) Qishen Huang (6112481) Xu Wu (318848) Jiayi Yin (5545859) Yu-Xin Liu (1551646) Longxue Deng (25157559) Shu-Feng Pang (1557811) Pai Liu (631732) Xiuhui Zhang (537250) Yun-Hong Zhang (460470) Maofa Ge (1406647) Physical Sciences not elsewhere classified Microbiology Evolutionary Biology Inorganic Chemistry Plasma Physics Infectious Diseases Computational Biology underlying scaling law ii )- catalyzed broad size range driven hygroscopic growth specific mn catalysis scale radius precision 2 </ sub droplet scaling analysis droplet growth oxidation size growth trajectory ph 5 ph 3 oxidation showed often used long tracking interfacial reaction evolving microdroplet ensemble measurements dependent kinetics continuously tracked continuous single continuous one confined mn compositional evolution central advance catalyst dilution bulk reaction bulk liquid broadband light Size-dependent kinetics in microdroplets are often used to infer whether reactions occur in the bulk liquid or at the air–water interface, but ensemble measurements can obscure the underlying scaling law. Here, we continuously tracked the radius of one optically levitated droplet to determine reaction location directly from its growth trajectory of the same evolving microdroplet. Benchmark SO₂ autoxidation experiments recovered distinct scaling behaviors for bulk reaction at pH 5.0 and interfacial reaction at pH 3.8. Applying the same analysis to Mn(II)-catalyzed SO₂ oxidation showed that the catalytically effective Mn inventory is diluted with droplet surface area rather than volume, providing direct dynamic evidence for surface-specific Mn catalysis during sulfate-driven hygroscopic growth. Broadband light-scattering aerosol optical tweezers enabled week-long tracking with nanometer-scale radius precision over a broad size range. The central advance is therefore the continuous one-droplet scaling analysis, which resolves how reaction kinetics evolve together with droplet growth, compositional evolution, and catalyst dilution. 2026-10-01T00:00:00Z Text Journal contribution 10.1021/acs.jpclett.6c02596.s001 https://figshare.com/articles/journal_contribution/Continuous_Single-Droplet_Tracking_Reveals_Scaling_Laws_of_Surface-Confined_Mn_II_-Catalyzed_SO_sub_2_sub_Oxidation/34047267 CC BY-NC 4.0