Nakamura Nobutomo, Sakamoto Yuto, Ogi Hirotsugu
Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka, 560-8531, Japan.
Graduate School of Engineering, Osaka University, Suita, Osaka, 565-0871, Japan.
Sci Rep. 2021 Apr 26;11(1):8929. doi: 10.1038/s41598-021-87626-9.
Nucleation by sedimentation of colloidal particles on a flat surface is experimentally observed, and effect of attractive depletion force generated by polymers on nucleation is investigated. Sedimentation forms polycrystalline colloidal crystal on a flat surface, and above the threshold polymer concentration, ratio of the spontaneous nucleation increases, resulting in a decrease in the grain size, whereas dependence of the contact angle on the polymer concentration was not observed. We show that the interaction between particles and the flat surface mainly affects the spontaneous nucleation, not the interaction between the particles, and it is demonstrated that the nucleation process can be numerically reproduced using the rate equations.
通过实验观察到胶体颗粒在平面上沉降成核，并研究了聚合物产生的吸引性耗尽力对成核的影响。沉降在平面上形成多晶胶体晶体，在聚合物浓度高于阈值时，自发成核的比例增加，导致晶粒尺寸减小，而未观察到接触角对聚合物浓度的依赖性。我们表明，颗粒与平面之间的相互作用主要影响自发成核，而非颗粒之间的相互作用，并且证明可以使用速率方程对成核过程进行数值再现。
