Effect of mixing structure on the hygroscopic behavior of ultrafine ammonium sulfate particles mixed with succinic acid and levoglucosan

- Hygroscopic properties of core-shell and well-mixed particles were measured.
- The shell hindered complete dissolution of the core-shell particles during hydration.
- Growth of core-shell particles was smaller than well-mixed particles under high RH.
- Mixing structure of particles affects their hygroscopic behavior.