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

doi:10.1038/srep46680

CORC > 北京大学 > 信息科学技术学院

	Abnormal gas-liquid-solid phase transition behaviour of water observed with in situ environmental SEM
	Chen, Xin ; Shu, Jiapei ; Chen, Qing
刊名	SCIENTIFIC REPORTS
	2017
关键词	SUPERCOOLED WATER ELECTRON-MICROSCOPY MOLECULAR-DYNAMICS ICE CRYSTALS SURFACE NUCLEATION CONDENSATION
DOI	10.1038/srep46680
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.; Shanghai Leading Academic Discipline Project [B502]; Shanghai Key Laboratory Project [08DZ2230500]; State Key Laboratory of Functional Materials for Informatics Open Project [SKL201306]; Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry; Beijing Harmony Resources Mechanical Equipment Co., LTD; MOST of China [2016YFA0200802]; NSF of China [61321001]; SCI(E); ARTICLE; 7
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/473900]
专题	信息科学技术学院
推荐引用方式 GB/T 7714	Chen, Xin,Shu, Jiapei,Chen, Qing. Abnormal gas-liquid-solid phase transition behaviour of water observed with in situ environmental SEM[J]. SCIENTIFIC REPORTS,2017.
APA	Chen, Xin,Shu, Jiapei,&Chen, Qing.(2017).Abnormal gas-liquid-solid phase transition behaviour of water observed with in situ environmental SEM.SCIENTIFIC REPORTS.
MLA	Chen, Xin,et al."Abnormal gas-liquid-solid phase transition behaviour of water observed with in situ environmental SEM".SCIENTIFIC REPORTS (2017).