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Bae, Sung Chul
Multiscale Optical Imaging Lab
Research Interests
  • Multiscale optical imaging, laser spectroscopy, laser microscopy, laser sensing, soft matter physics, surface and interfacial science, laser Matter Interaction

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Nanoparticle-induced surface reconstruction of phospholipid membranes

Cited 154 times inthomson ciCited 124 times inthomson ci
Title
Nanoparticle-induced surface reconstruction of phospholipid membranes
Author
Wang, BoZhang, LiangfangBae, Sung ChulGranick, Stev
Keywords
Adsorption; Fluorescence; Phase transition
Issue Date
200811
Publisher
NATL ACAD SCIENCES
Citation
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, v.105, no.47, pp.18171 - 18175
Abstract
The nonspecific adsorption of charged nanoparticles onto single-component phospholipid bilayers bearing phosphocholine head-groups is shown, from fluorescence and calorimetry experiments, to cause surface reconstruction at the points where nanoparticles adsorb. Nanoparticles of negative charge induce local gelation in otherwise fluid bilayers; nanoparticles of positive charge induce otherwise gelled membranes to fluidize locally. Through this mechanism, the phase state deviates from the nominal phase transition temperature by tens of degrees. This work generalizes the notions of environmentally induced surface reconstruction, prominent in metals and semiconductors. Bearing in mind that chemical composition in these single-component lipid bilayers is the same everywhere, this offers a mechanism to generate patchy functional properties in phospholipid membranes.
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DOI
http://dx.doi.org/10.1073/pnas.0807296105
ISSN
0027-8424
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