大连理工大学肖武团队报道了用于冷却结晶晶种的聚合物中空纤维膜，基于热传递的诱导成核机理研究。相关研究成果于2024年1月4日发表在国际顶尖学术期刊《颗粒学报》。

冷却结晶是一种重要的分离过程和颗粒学技术，需要精确的成核控制策略。

该文中，研究人员介绍了具有适当热性能的聚合物中空纤维膜，作为冷却结晶过程中的有效成核诱导界面。基于经典形核理论和传热过程，介绍了非均匀形核控制机理。用所建立的模型对聚四氟乙烯（PTFE）和聚醚砜（PES）两种聚合物膜的，界面性质和导热系数进行了测量和模拟。

这两种膜具有不同的成核诱导期、成核速率和结晶性能，验证了与传统的冷却结晶相比，中空纤维膜组件由于缩短了成核诱导周期和降低了溶液表面张力，可以有效地加速成核过程。由于PTFE膜具有较高的疏水性和较低的膜表面粗糙度，与PES膜相比，PTFE膜在产生稳定的非均匀成核方面具有更温和的性能。因此，可调节的膜性能使中空纤维膜辅助冷却结晶，能够具有精确的成核控制和所需的最终颗粒产物。

附：英文原文

Title: Polymeric hollow fiber membrane for cooling crystallization seeding: On the mechanism of induced nucleation based on thermal transfer

Author: Zeman He, Shaofu Du, Guanying Shao, Peiyu Li, Lei Sheng, Gaohong He, Xiaobin Jiang, Wu Xiao

Issue&Volume: 2024/01/04

Abstract: Cooling crystallization is an important separation process and particuology technology that requires accurate nucleation control strategies. Herein, we introduced the polymeric hollow fiber membrane with proper thermal properties as the effective nucleation induction interface during cooling crystallization. The heterogeneous nucleation control mechanism was introduced based the classical nucleation theory and thermal transfer process. Interfacial properties and the thermal conductivity of two kinds of polymeric membranes, polytetrafluoroethylene (PTFE) and polyethersulfone (PES), were measured and simulated with the developed model. These two membranes possessed different nucleation induction period, nucleation rate and crystallization performance, which validated that the hollow fiber membrane module could effectively accelerate the nucleation process compared to the conventional cooling crystallization owing to the shorten nucleation induction period and the reduced solution surface tension. Due to the higher hydrophobicity and the lower roughness of the membrane surface, PTFE membrane possessed a more moderate performance on generating stable heterogeneous nucleation than the one of PES membrane. Thus, the adjustable membrane property enabled the hollow fiber membrane-assisted cooling crystallization to possess the accurate nucleation control and desired terminal particle products.

DOI: 10.1016/j.partic.2023.12.014

Source: https://www.sciencedirect.com/science/article/abs/pii/S1674200124000026