Probing hydrophilic interface of solid/liquid-water by nanoultrasonics

Pierre Adrien Mante, Chien Cheng Chen, Yu Chieh Wen, Hui Yuan Chen, Szu Chi Yang, Yu Ru Huang, I. J. Chen, Yun Wen Chen, Vitalyi Gusev, Miin Jang Chen, Jer Lai Kuo, Jinn Kong Sheu, Chi Kuang Sun

Research output: Journal article publicationJournal articleAcademic researchpeer-review

42 Citations (Scopus)


Despite the numerous devoted studies, water at solid interfaces remains puzzling. An ongoing debate concerns the nature of interfacial water at a hydrophilic surface, whether it is more solid-like, ice-like, or liquid-like. To answer this question, a complete picture of the distribution of the water molecule structure and molecular interactions has to be obtained in a non-invasive way and on an ultrafast time scale. We developed a new experimental technique that extends the classical acoustic technique to the molecular level. Using nanoacoustic waves with a femtosecond pulsewidth and an ångström resolution to noninvasively diagnose the hydration structure distribution at ambient solid/water interface, we performed a complete mapping of the viscoelastic properties and of the density in the whole interfacial water region at hydrophilic surfaces. Our results suggest that water in the interfacial region possesses mixed properties and that the different pictures obtained up to now can be unified. Moreover, we discuss the effect of the interfacial water structure on the abnormal thermal transport properties of solid/liquid interfaces.

Original languageEnglish
Article number6249
JournalScientific Reports
Publication statusPublished - 1 Sept 2014
Externally publishedYes

ASJC Scopus subject areas

  • General


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