Can secondary nucleation exist in ice banding of freezing colloidal suspensions?  

作　　者：游家学 王锦程 王理林 王志军 李俊杰 林鑫 

机构地区：[1]State Key Laboratory of Solidification Processing,Northwestern Polytechnical University [2]School of Materials Science and Engineering,Xi'an University of Technology

出　　处：《Chinese Physics B》2016年第12期481-484,共4页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.51371151 and 51571165);the Free Research Fund of State Key Laboratory of Solidification Processing,China(Grant No.100-QP-2014);the Fund of State Key Laboratory of Solidification Processing in Northwestern Polytechnical University(NWPU),China(Grant No.13-BZ-2014);the Fundamental Research Funds for the Central Universities,China(Grant No.3102015ZY020)

摘　　要：The formation mechanism of ice banding in the system of freezing colloidal suspensions, which is of significance in frost heaving, ice-templating porous materials and biological materials, is still a mystery. Recently, the theory of secondary nucleation and growth of ice has been proposed to explain the emergence of a new ice lens. However, this theory has not been quantitatively examined. Here, we quantitatively measure the initial interfacial undercooling of a new ice lens and the nucleation undercoolings of suspensions. We find that the interfacial nndercooling cannot satisfy the nucleation undercooling of ice and hence disprove the secondary nucleation mechanism for ice banding.The formation mechanism of ice banding in the system of freezing colloidal suspensions, which is of significance in frost heaving, ice-templating porous materials and biological materials, is still a mystery. Recently, the theory of secondary nucleation and growth of ice has been proposed to explain the emergence of a new ice lens. However, this theory has not been quantitatively examined. Here, we quantitatively measure the initial interfacial undercooling of a new ice lens and the nucleation undercoolings of suspensions. We find that the interfacial nndercooling cannot satisfy the nucleation undercooling of ice and hence disprove the secondary nucleation mechanism for ice banding.

关 键 词：colloidal suspensions FREEZING NUCLEATION ice banding 

分 类 号：O648.22[理学—物理化学]