Volume and porosity thermal regulation in lipid mesophases by coupling mobile ligands to soft membranes
Mognetti, Bortolo M
Di, Michele Lorenzo
Nature Publishing Group
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Parolini, L., Mognetti, B. M., Kotar, J., Eiser, E., Cicuta, P., & Di, M. L. (2015). Volume and porosity thermal regulation in lipid mesophases by coupling mobile ligands to soft membranes. Nature Communications, 6 5948. https://doi.org/10.1038/ncomms6948
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.
Funding was provided by the Ernest Oppenheimer Fund and Emmanuel College Cambridge (L.D.M.), EPSRC Programme Grant CAPITALS number EP/J017566/1 (L.P., J.K., P.C. and L.D.M.) and the Winton Fund for Physics of Sustainability (E.E.).
External DOI: https://doi.org/10.1038/ncomms6948
This record's URL: https://www.repository.cam.ac.uk/handle/1810/246836
Attribution 2.0 UK: England & Wales
Licence URL: http://creativecommons.org/licenses/by/2.0/uk/
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