The aerosol optical tweezers apparatus utilized in our present work has been described elsewhere, and thus it is only briefly described here. A CW laser emitting at 532 nm was used as a trapping laser. After entering the microscope, the laser beam was focused by a high numerical aperture oil-immersion objective into an aerosol trapping chamber. When For the measurements of binary aqueous STS aerosols, the sample solutions for generating aerosols contained 0.6 M or 0.9 M STS. For the measurements of ternary component aerosols containing water, STS and sucrose, the sample solutions were prepared at several mass ratios, for example, STS : sucrose : water = 2 : 4 : 15.