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@ARTICLE{Dasgupta:171706,
      author       = {Dasgupta, Sabyasachi and Katava, Marina and Faraj, Mohammed
                      and Auth, Thorsten and Gompper, Gerhard},
      title        = {{C}apillary {A}ssembly of {M}icroscale {E}llipsoidal,
                      {C}uboidal, and {S}pherical {P}articles at {I}nterfaces},
      journal      = {Langmuir},
      volume       = {30},
      number       = {40},
      issn         = {0743-7463},
      address      = {Washington, DC},
      publisher    = {ACS Publ.},
      reportid     = {FZJ-2014-05275},
      pages        = {11873-11882},
      year         = {2014},
      abstract     = {Micron-sized anisotropic particles with homogeneous surface
                      properties at a fluid interface can deform the interface due
                      to their shape. The particles thereby create excess
                      interfacial area and interact in order to minimize this
                      area, which lowers the total interfacial energy. We present
                      a systematic investigation of the interface deformations
                      around single ellipsoidal particles and cuboidal particles
                      with rounded edges in the near field for various contact
                      angles and particle aspect ratios. The correlation of these
                      deformations with capillary bond energies—the interaction
                      energies of two particles at contact—quantifies the
                      relation between the interactions and the near-field
                      deformations. We characterize the interactions using
                      effective power laws and investigate how anisotropic
                      particles self-assemble by capillary forces. Interface
                      deformations and particle interactions for cuboidal
                      particles are weaker compared with those for ellipsoidal
                      particles with the same aspect ratios. For both particle
                      shapes, the bound state in side-by-side orientation is most
                      stable, while the interaction in tip-to-side orientation is
                      repulsive. Furthermore, we find capillary attraction between
                      spherical and ellipsoidal particles. Our calculations
                      therefore suggest cluster formation of spherical and
                      ellipsoidal particles, which elucidates the role of
                      spherical particles as stoppers for the growth of worm-like
                      chains of ellipsoidal particles. The interaction between
                      spherical and ellipsoidal particles might also explain the
                      suppression of the “coffee-ring effect” that has been
                      observed for evaporating droplets with mixtures of spherical
                      and ellipsoidal particles. In general, our calculations of
                      the near-field interactions complement previous calculations
                      in the far field and help to predict colloidal assembly and
                      rheological properties of particle-laden interfaces.},
      cin          = {IAS-2 / ICS-2},
      ddc          = {670},
      cid          = {I:(DE-Juel1)IAS-2-20090406 / I:(DE-Juel1)ICS-2-20110106},
      pnm          = {451 - Soft Matter Composites (POF2-451)},
      pid          = {G:(DE-HGF)POF2-451},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000343195800005},
      pubmed       = {pmid:25226046},
      doi          = {10.1021/la502627h},
      url          = {https://juser.fz-juelich.de/record/171706},
}