Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2002-05-04
Eur. Phys. J. E 8, 59 (2002)
Physics
Condensed Matter
Soft Condensed Matter
22 pages, 6 eps figures, to be published in EPJE (2002)
Scientific paper
10.1140/epje/i2002-10008-2
Biomimetic membranes in contact with a planar substrate or a second membrane are studied theoretically. The membranes contain specific adhesion molecules (stickers) which are attracted by the second surface. In the absence of stickers, the trans--interaction between the membrane and the second surface is assumed to be repulsive at short separations. It is shown that the interplay of specific attractive and generic repulsive interactions can lead to the formation of a potential barrier. This barrier induces a line tension between bound and unbound membrane segments which results in lateral phase separation during adhesion. The mechanism for adhesion--induced phase separation is rather general, as is demonstrated by considering two distinct cases involving: (i) stickers with a linear attractive potential, and (ii) stickers with a short--ranged square--well potential. In both cases, membrane fluctuations reduce the potential barrier and, therefore, decrease the tendency of phase separation.
Andelman David
Komura Shigeyuki
Lipowsky Reinhard
Weikl Thomas R.
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