期刊
PHYSICAL REVIEW LETTERS
卷 105, 期 17, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.105.178302
关键词
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资金
- EPSRC [EP/E030173, EP/E045316]
- Royal Society
- EPSRC [EP/E030173/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/E030173/1] Funding Source: researchfish
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.
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