Jump to main content
Jump to site search

Issue 13, 2013
Previous Article Next Article

Capillary interactions between spherical Janus particles at liquid–fluid interfaces

Author affiliations

Abstract

We study the interactions of spherical Janus particles at non-equilibrium orientations adsorbed at flat oil–water interfaces. At equilibrium, the orientation of Janus spheres results in each hemisphere being exposed to its more favored fluid. Experimental observations suggest that some of these particles may take a tilted orientation at the interface, giving rise to energetic inter-particle interactions. The interface shape around the particles is obtained numerically by minimizing the total surface energy of the system comprising the interface and particle-fluid regions. We quantify these interactions through evaluation of capillary energy variation as a function of the separation distance between the particles. Depending on the relative orientations of neighboring particles, attractive or repulsive forces appear between Janus spheres. The interactions are found to be dipolar in nature, with a pair potential inversely proportional to the third power of the inter-particle distance. We find that Janus spheres with similar orientations undergo a relative realignment in the interface plane in order to minimize the capillary energy. We also evaluate the dependence of capillary forces on the size and degree of amphiphilicity between two sides of the particle. This study can provide new insight into understanding the interactions and assembly of Janus particles of random orientations at liquid–fluid interfaces.

Graphical abstract: Capillary interactions between spherical Janus particles at liquid–fluid interfaces

Back to tab navigation

Publication details

The article was received on 15 Oct 2012, accepted on 30 Jan 2013 and first published on 21 Feb 2013


Article type: Paper
DOI: 10.1039/C3SM27380F
Citation: Soft Matter, 2013,9, 3640-3650
  •   Request permissions

    Capillary interactions between spherical Janus particles at liquid–fluid interfaces

    H. Rezvantalab and S. Shojaei-Zadeh, Soft Matter, 2013, 9, 3640
    DOI: 10.1039/C3SM27380F

Search articles by author

Spotlight

Advertisements