报告题目：How freezing breaks soft materials
报告时间：2024 年9月6日(周五) 下午15:00
报告地点：3号楼307会议室
报告人：Rober Style
邀请人：土井正男 研究员
简介：Dr. Rober Style did his Phd studying the physics of ice growth at Cambridge University in the UK. He then had postdoctoral positions at Oxford (UK) and Yale (USA) working on freezing and the mechanical properties of soft solids, before taking a post as a Lecturer at Oxford, and subsequently moving to his current post as a Group Leader in the Department of Materials at ETH Zurich.
报告摘要：Most people think that damage caused by freezing is due to water's expansion as it freezes. However, in most soft materials, this actually plays a rather insignificant role. Indeed, liquids that shrink as they freeze also cause damage. Instead, freezing damage is typically caused by unfrozen water being sucked towards existing ice crystals, and feeding their growth. This can lead to huge amounts of ice expansion inside soft, wet materials. Surprisingly, this process is still not well understood. We study freezing by 3d imaging of soft materials as they cool. Although the results appear complex, I will show how damage caused by freezing can be understood in terms of well-known concepts from fracture and adhesion. Furthermore, I will show how unexpected factors, such as the polycrystallinity of ice, can play an important role in the freezing process.
