Title

Theoretical contact angles on a nano-heterogeneous surface composed of parallel apolar and polar strips

Document Type

Article

Publication Date

6-30-2004

Department

Department of Materials Science and Engineering

Abstract

Neumann−Good's parallel strip model (J. Colloid Interface Sci. 1972, 38, 341) was used to analyze the contact angle hysteresis for a liquid on a heterogeneous surface composed of alternatively aligned horizontal apolar (θ = 70°) and polar (θ = 0°) strips. The critical size of the strip width, below which the contact angle hysteresis disappears, was determined on the basis of the analysis of the activation energy for wetting to be from 6 to 12 nm. This calculated value of the critical strip size is 1 order of magnitude smaller than that of 0.1 μm, which has been commonly considered as the limit of heterogeneity size causing the appearance of the contact angle hysteresis.

Publisher's Statement

© 2004 American Chemical Society. Publisher's version of record: https://doi.org/10.1021/la0364587

Publication Title

Langmuir

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