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Proposed reasons include strong electric fields at the surface, partial drying of reactants and evaporation that concentrates them.","posed_since":"","precise":"For bimolecular reactions in aqueous microdroplets of radius 1 to 50 micrometers, determine the true acceleration factor of the rate constant relative to bulk after correcting for evaporation, concentration changes, gas-phase reactions in the mass spectrometer inlet and ion-source chemistry, and identify the dominant cause (interfacial electric field, partial solvation, interfacial pH, charge). An answer is a corrected acceleration factor for benchmark reactions plus a mechanism that predicts it.","problem_ref":null,"references":"","settled_by":"In situ, inlet-free kinetic measurements (for example fluorescence or Raman in levitated droplets) matched to simulations of interfacial reaction free energies.","status_note":"","title":"Mechanism of reaction acceleration in 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