These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Colloids in cholesterics: size-dependent defects and non-stokesian microrheology.
    Author: Lintuvuori JS, Stratford K, Cates ME, Marenduzzo D.
    Journal: Phys Rev Lett; 2010 Oct 22; 105(17):178302. PubMed ID: 21231085.
    Abstract:
    We simulate a colloidal particle (radius R) in a cholesteric liquid crystal (pitch p) with tangential order parameter alignment at the particle surface. The local defect structure evolves from a dipolar pair of surface defects (boojums) at small R/p to a pair of twisted disclination lines wrapping around the particle at larger values. On dragging the colloid with small velocity v through the medium along the cholesteric helix axis (an active microrheology measurement), we find a hydrodynamic drag force that scales linearly with v but superlinearly with R-in striking violation of Stokes' law, as generally used to interpret such measurements.
    [Abstract] [Full Text] [Related] [New Search]