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Volume and porosity thermal regulation in lipid mesophases by coupling mobile ligands to soft membranes.

Abstract：

:Short DNA linkers are increasingly being exploited for driving-specific self-assembly of Brownian objects. DNA-functionalized colloids can assemble into ordered or amorphous materials with tailored morphology. Recently, the same approach has been applied to compliant units, including emulsion droplets and lipid vesicles. The liquid structure of these substrates introduces new degrees of freedom: the tethers can diffuse and rearrange, radically changing the physics of the interactions. Unlike droplets, vesicles are extremely deformable and DNA-mediated adhesion causes significant shape adjustments. We investigate experimentally the thermal response of pairs and networks of DNA-tethered liposomes and observe two intriguing and possibly useful collective properties: negative thermal expansion and tuneable porosity of the liposome networks. A model providing a thorough understanding of this unexpected phenomenon is developed, explaining the emergent properties out of the interplay between the temperature-dependent deformability of the vesicles and the DNA-mediated adhesive forces.

journal_name

Nat Commun

journal_title

Nature communications

authors

Parolini L,Mognetti BM,Kotar J,Eiser E,Cicuta P,Di Michele L

doi

10.1038/ncomms6948

subject

Has Abstract

pub_date

2015-01-07 00:00:00

pages

5948

issn

2041-1723

pii

ncomms6948

journal_volume

6

pub_type

杂志文章

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