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Materials 2016, 9(8), 664; doi:10.3390/ma9080664

Effect of Geometric and Chemical Anisotropy of Janus Ellipsoids on Janus Boundary Mismatch at the Fluid–Fluid Interface

Department of Chemical Engineering, Kyung Hee University, Yongin, Gyeonggi-do 17104, Korea
These authors contributed equally to this work.
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Author to whom correspondence should be addressed.
Academic Editor: To Ngai
Received: 20 June 2016 / Revised: 20 July 2016 / Accepted: 4 August 2016 / Published: 6 August 2016
(This article belongs to the Special Issue Pickering Emulsion and Derived Materials)
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Abstract

We investigated the geometric and chemical factors of nonspherical Janus particles (i.e., Janus ellipsoids) with regard to the pinning and unpinning behaviors of the Janus boundary at the oil–water interface using attachment energy numerical calculations. The geometric factors were characterized by aspect ratio (AR) and location of the Janus boundary (α) separating the polar and apolar regions of the particle. The chemical factor indicated the supplementary wettability (β) of the two sides of the particle with identical deviations of apolarity and polarity from neutral wetting. These two factors competed with each other to determine particle configurations at the interface. In general, the critical value of β (βc) required to preserve the pinned configuration was inversely proportional to the values of α and AR. From the numerical calculations, the empirical relationship of the parameter values of Janus ellipsoids was found; that is, λ = Δ β c / Δ α 0.61 A R 1.61 . Particularly for the Janus ellipsoids with AR > 1, the βc value is consistent with the boundary between the tilted only and the tilted equilibrium/upright metastable region in their configuration phase diagram. We believe that this work performed at the single particle level offers a fundamental understanding of the manipulation of interparticle interactions and control of the rheological properties of particle-laden interfaces when particles are used as solid surfactants. View Full-Text
Keywords: Janus particle; fluid–fluid interface; attachment energy; configuration; Janus boundary Janus particle; fluid–fluid interface; attachment energy; configuration; Janus boundary
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Kang, D.W.; Ko, W.; Lee, B.; Park, B.J. Effect of Geometric and Chemical Anisotropy of Janus Ellipsoids on Janus Boundary Mismatch at the Fluid–Fluid Interface. Materials 2016, 9, 664.

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