文献类型：期刊文献

英文题名：Abnormal gas-liquid-solid phase transition behaviour of water observed with in situ environmental SEM

作者：Chen, Xin[1,2,3];Shu, Jiapei[4,5,6];Chen, Qing[4,5]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Minist Educ, Key Lab Ultrafine Mat, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai Key Lab Adv Polymer Mat, Shanghai 200237, Peoples R China;[3]Chinese Acad Sci, Shanghai Inst Microsyst & Informat Technol, State Key Lab Funct Mat Informat, 865 Changning Rd, Shanghai 200050, Peoples R China;[4]Peking Univ, Key Lab Phys & Chem Nanodevices, Beijing 100871, Peoples R China;[5]Peking Univ, Dept Elect, Beijing 100871, Peoples R China;[6]Peking Univ, Acad Adv Interdisciplinary Studies, Beijing 100871, Peoples R China

年份：2017

卷号：7

外文期刊名：SCIENTIFIC REPORTS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000400057400001)】；

基金：The supports from the Shanghai Leading Academic Discipline Project (B502), the Shanghai Key Laboratory Project (08DZ2230500), the State Key Laboratory of Functional Materials for Informatics Open Project (SKL201306), and the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry are acknowledged. The authors are also especially thankful for the financial support from Beijing Harmony Resources Mechanical Equipment Co., LTD. J. P. Shu and Q. Chen are supported by the MOST of China (Grant No. 2016YFA0200802) and NSF of China (Grant No. 61321001).

语种：英文

摘要：Gas-liquid-solid phase transition behaviour of water is studied with environmental scanning electron microscopy for the first time. Abnormal phenomena are observed. At a fixed pressure of 450 Pa, with the temperature set to -7 degrees C, direct desublimation happens, and ice grows continuously along the substrate surface. At 550 Pa, although ice is the stable phase according to the phase diagram, metastable liquid droplets first nucleate and grow to similar to 100-200 mu m sizes. Ice crystals nucleate within the large sized droplets, grow up and fill up the droplets. Later, the ice crystals grow continuously through desublimation. At 600 Pa, the metastable liquid grows quickly, with some ice nuclei floating in it, and the liquid-solid coexistence state exists for a long time. By lowering the vapour pressure and/or increasing the substrate temperature, ice sublimates into vapour phase, and especially, the remaining ice forms a porous structure due to preferential sublimation in the concave regions, which can be explained with surface tension effect. Interestingly, although it should be forbidden for ice to transform into liquid phase when the temperature is well below 0 degrees C, liquid like droplets form during the ice sublimation process, which is attributed to the surface tension effect and the quasiliquid layers.