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Branching of colloidal chains in capillary-confined nematics | | Pavel Kossyrev
; Miha Ravnik
; Slobodan Zumer
; | | Date: |
3 Feb 2006 | | Journal: | Phys Rev Lett, 96 (4), 048301 | | Abstract: | We report on the observation of colloidal chain assembly and branching inside capillaries filled with a nematic liquid crystal. Because of the homeotropic anchoring of liquid crystalline molecules on the capillary and colloidal droplet surfaces, the assembly of droplets along the capillary axis is expected, producing a transformation of the nematic director field from an escape-radial to quasiradial configuration. However, the subsequent over time branching of the straight colloidal chains is counterintuitive. By numerical simulations, we demonstrate that chain branching can occur by overcoming an energy barrier and can at least dwell as a metastable configuration. Moreover, manipulation of colloidal chains by electric fields and their gradients demonstrates various regimes of chain behavior in electric fields. | | Source: | PubMed, pmid16486901 | | Services: | Forum | Review | Favorites | |
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