Direct Observation of a Defect-Mediated Viscoelastic Transition in a Hydrogel of Lipid Membranes and Polymer Lipids

S. L. Keller, H. E. Warriner, C. R. Safinya, Joseph A Zasadzinski

Research output: Contribution to journalArticlepeer-review

Abstract

We present the first direct imaging of a new hydrogel of lipid membranes containing polymer lipids. Freeze-fracture electron microscopy shows unambiguously that the hydrogel's surprisingly large viscoelasticity is explained by a novel defect topology of interconnections between defects. The defects are spherulites with high membrane curvatures which are either isotropic or cylinderlike. A lower concentration of dislocation-type defects was also observed. The interconnections between the defects distinguish the hydrogel from simple “onion” phases of multilamellar vesicles with a smaller viscoelasticity.

Original languageEnglish (US)
Pages (from-to)4781-4784
Number of pages4
JournalPhysical review letters
Volume78
Issue number25
DOIs
StatePublished - Jun 23 1997
Externally publishedYes

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