Nonlinear chiral rheology of phospholipid monolayers

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Microbutton rheometry reveals that the chiral morphology of dipalmitoylphosphatidylcholine (DPPC) monolayers imparts a chiral nonlinear rheological response. The nonlinear elastic modulus and yield stress of DPPC monolayers are greater when sheared clockwise (C), against the natural winding direction of DPPC domains, than counter-clockwise (CC). Under strong CC shear strains, domains deform plastically; by contrast, domains appear to fracture under strong C shearing. After CC shearing, extended LC domains develop regular patterns of new invaginations as they recoil, which we hypothesize reflect the nucleation and growth of new defect lines across which the tilt direction undergoes a step change in orientation. The regular spacing of these twist-gradient defects is likely set by a competition between the molecular chirality and the correlation length of the DPPC lattice. The macroscopic mechanical consequences of DPPC's underlying molecular chirality are remarkable, given the single-component, non-cross-linked nature of the monolayers they form.
Publisher
ROYAL SOC CHEMISTRY
Issue Date
2018-04
Language
English
Article Type
Article
Keywords

AIR-WATER-INTERFACE; LIQUID-CRYSTAL; LANGMUIR MONOLAYERS; PHASE; TRANSITIONS; VISCOSITY; BOUNDARY; SHAPES; FLOW

Citation

SOFT MATTER, v.14, no.13, pp.2476 - 2483

ISSN
1744-683X
DOI
10.1039/c8sm00184g
URI
http://hdl.handle.net/10203/244330
Appears in Collection
CBE-Journal Papers(저널논문)
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