限域传质过程中的介尺度结构  

Mesoscale structures in confined mass transfer processes

作　　者：曹健 覃瑶 潘雪玲 冯新[1] 朱育丹[1,2] 陆小华 Jian Cao;Yao Qin;Xueling Pan;Xin Feng;Yudan Zhu;Xiaohua Lu(Sate Key Laboratory of Materials-Oriented Chemical Engineering,Nanjing Tech University,Nanjing 211816,China;Suzhou Laboratory,Suzhou 215000,China)

机构地区：[1]材料化学工程国家重点实验室,南京工业大学,南京211816 [2]苏州实验室,苏州215000

出　　处：《中国科学：化学》2024年第11期1967-1975,共9页SCIENTIA SINICA Chimica

基　　金：国家自然科学基金资助项目(编号:22327809,91934302,222378182,21921006)。

摘　　要：现代化工研究聚焦介观尺度,多尺度、非线性、多目标等复杂性难以通过经典“三传一反”理论进行描述.本文应用介科学方法,对多相反应、膜分离等领域所涉及的限域传质过程进行分析,针对含界面限域孔道(系统)和受非对称相互作用流体分子集群(单元)之间的介尺度问题,发现介尺度结构可以通过粘性阻力和摩擦阻力定量描述;限域度和润湿性可用于分别描述宏尺度和微尺度结构参数,是定量液-液粘性控制(机制A)和固-液摩擦控制(机制B)之间竞争与协调的关键变量;通过亚纳米限域膜溶剂通量预测、二维石墨烯基膜中醇水分离选择性预测和氢氧直接合成双氧水多相反应三个案例讨论了限域传质引入介尺度非均匀结构的重要性,有望为多孔材料的理性设计提供重要理论依据.Modern chemical engineering research focuses on the mesoscale,where it is difficult to be described by classical theory of transfer and reaction due to the complexities of multi-scale,nonlinear,and multi-objective.Mesoscience was used in this work to study the confined mass transfer involved in the heterogeneous reaction,membrane separation,and other fields.Focusing on the mesoscale problems between pore channels under nanoconfinement(under system scale)and clusters of fluid molecules with asymmetric interactions(under unit scale),it is found that the mesoscale structures can be quantitatively described by viscous and frictional resistances.The confined degree and wetting parameter,as macro scale and micro scale structural parameters respectively,can be used to describe the compromise of competition between the liquid-liquid viscous-dominated mechanism and the solid-liquid frictional-dominated mechanism.In addition,the importance of mesoscale structures on confined mass transfer was discussed based on three cases:predicting the flux of solvents in sub nano confined membranes,predicting the selectivity of alcohol/water in two-dimensional graphene-based membrane separation,and the heterogeneous reaction of synthesizing H2O2 by H2 and O2 directly.This work is expected to provide a new perspective for the rational design of porous materials.

关 键 词：介观尺度 介科学 限域传质 介尺度结构 理性设计 

分 类 号：TQ021.4[化学工程]