Hydrophobicity at a Janus interface

Xueyan Zhang, Yingxi Zhu, Steve Granick

Research output: Contribution to journalArticlepeer-review


Water confined between adjoining hydrophobic and hydrophilic surfaces (a Janus interface) is found to form stable films of nanometer thickness whose responses to shear deformations are extraordinarily noisy. The power spectrum of this noise is quantified. In addition, the frequency dependence of the complex shear modulus is a power law with slope one-half, indicating a distribution of relaxation processes rather than any dominant one. The physical picture emerges that whereas surface energetics encourage water to dewet the hydrophobic side of the interface, the hydrophilic side constrains water to be present, resulting in a flickering, fluctuating complex.

Original languageEnglish (US)
Pages (from-to)663-666
Number of pages4
Issue number5555
StatePublished - Jan 25 2002

ASJC Scopus subject areas

  • General


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