Lipid and lipid-polymer mixtures at an interface

Kim, Joon Heon; Kim, Mahn Won
June 2000
AIP Conference Proceedings;2000, Vol. 519 Issue 1, p446
Academic Journal
The surface pressure (Π) and surface area/molecule (A) isotherms of a mixture of DMPC (DL-α-phosphatidylcholine,Dimyristoyl) and PEG-DMPE (1,2-Diacyl-sn-Glycero-3Phosphoethanolamine-N-[Poly(ethylene glycol)5000]) system were measured at various compositions by the Langmuir surface balance technique at an air/water interface. In the range where the surface pressure is less than about 8 dynes/cm, a PEG polymer chain of PEG-DMPE molecules remains on the surface and the isotherm can be explained by the 2-D power law behavior of chains in a good solvent. In the range above 8 dynes/cm, a part of the PEG polymer segment is dissolved into the water phase, and the surface pressure can be explained as the sum of the 2-D component and 3-D component. Furthermore, the mixing energy is negative, which indicates an attractive interaction between DMPC and PEG-DMPE.


Related Articles

  • Effects of Surface Tension on the Stability of Dynamical Liquid-Vapor Interfaces. Benzoni-Gavage, S.; Freistühler, H. // Archive for Rational Mechanics & Analysis;Oct2004, Vol. 174 Issue 1, p111 

    The persistence of sharp and flat interfaces under multidimensional perturbations is investigated from a viewpoint analogous to Majda’s treatment of classical shocks. The main novelty here is that jump conditions for the free interfaces take into account surface tension. This means that,...

  • Liquid-Vapor Interfaces and Surface Tension in a Mesoscopic Model of Fluid with Nonlocal Interactions. De Masi, A.; Gobron, T. // Journal of Statistical Physics;Apr2004, Vol. 115 Issue 1/2, p643 

    We analyze the problem of phase coexistence, surface tension and the interface patterns between liquid and vapour for the nonlocal free energy functional derived by Lebowitz, Mazel, and Presutti from a system of particles interacting through Kac potentials in the continuum. We study the sharp...

  • The Effect of Finiteness in the Saffman—Taylor Viscous Fingering Problem. Crowdy, Darren; Tanveer, Saleh // Journal of Statistical Physics;Mar2004, Vol. 114 Issue 5/6, p1501 

    We derive a family of exact time-evolving solutions for the the evolution of a finite blob of fluid confined to a channel in a Hele–Shaw cell. We show rigorously that, for large fluid volume, there are solutions for which one of the interfaces approaches the steady Saffman–Taylor...

  • Two-particle microrheology at oil-water interfaces. Chih-yuan Wu; Yanmei Song; Dai, Lenore L. // Applied Physics Letters;10/5/2009, Vol. 95 Issue 14, p144104 

    We have explored and validated two-particle (2P) microrheology at polydimethylsiloxane (oil)-water interfaces using confocal laser scanning microscopy. The loss and storage moduli of the oil-water interfaces as a function of frequency are quantified using different tracer particles. In contrast...

  • Contact line dynamics on heterogeneous surfaces. Ren, Weiqing; Weinan E // Physics of Fluids;Jul2011, Vol. 23 Issue 7, p072103 

    Contact line dynamics on rough or chemically heterogeneous surfaces has been a subject of great interest. Most previous work focused on the issue of contact angle hysteresis in the static limit. This paper is devoted to the study of contact line dynamics on a chemically patterned surface over a...

  • Discrete set selection of Saffman—Taylor fingers. Kessler, David A.; Levine, Herbert // Physics of Fluids (00319171);May87, Vol. 30 Issue 5, p1246 

    A study of the linear stability of the discrete set of steady-state Saffman-Taylor finger solutions at finite surface tension is presented. It is shown by explicit computation that members of the set aside from the lowest width finger are linearly unstable. This completes the demonstration that...

  • The magnitude and location of the surface tension of curved interfaces. Baus, M.; Lovett, R. // Journal of Chemical Physics;7/1/1995, Vol. 103 Issue 1, p377 

    A thermodynamic definition is given for the spatial distribution of the force in a curved interface that manifests itself macroscopically as the ‘‘surface tension.’’ A general thermodynamic characterization of a curved interface requires a complete knowledge of this...

  • Surface tension in terms of direct correlation function c(r,r'): Proposed modelling of c(r,r')... March, N.H.; Tosi, M.P. // Journal of Chemical Physics;7/22/1999, Vol. 111 Issue 4, p1786 

    Proposes a model for the function K[sub 2](z,z') for the surface tension associated with the liquid-vapor interface. Quantity characterizing the low-order density gradient method; Alternative formula for the surface tension.

  • The influence of interface profile on the onset of long-wavelength Marangoni cenvection. Becerril, Ricardo; Van Hook, Stephen J. // Physics of Fluids;Dec98, Vol. 10 Issue 12, p3230 

    Studies the influence of interface profile on the onset of long-wavelength Marangoni convection. Long-wavelength surface-tension-driven rupture of thin liquid layers; Observance of deformed interfaces even with no imposed temperature gradient; Deviations from standard linear stability theory.


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics