Title

Release and Formation of Surface-Localized Ionic Clusters (SLICs) Into Phospholipid Rafts From Colloidal Solutions During Coalescence

Document Type

Article

Publication Date

3-15-2005

Department

Polymers and High Performance Materials

Abstract

Stimuli-responsive behavior of phospholipids in the presence of ionic surfactants utilized in synthesis of MMA/nBA colloidal particles was investigated. Utilizing 1-myristoyl-2-hydroxy-sn-glycero-phosphocholine (MHPC) phospholipid, and sodium dioctyl sulfosuccinate (SDOSS) surfactant as dispersing media in H2O, narrow unimodal particle size distributions of methyl methacrylate (MMA)/n-butylacrylate (nBA) copolymers were synthesized. The particle diameters were 154 nm when a SDOSS/MHPC mixture was used and 161 nm using MHPC as the only surface-stabilizing species. When such colloidal dispersions are exposed to 1.7, 3.3, and 6.7 mM aqueous CaCl2 and KCl electrolyte solutions, surface-localized ionic clusters are generated at the film-air interface that may serve as lipid rafts composed of crystalline phases of MHPC deposited on poly(MMA)/nBA films. These studies illustrate that it is possible to control release and morphology developments of surface phospholipid rafts on artificial surfaces.

Publication Title

Langmuir

Volume

21

Issue

6

First Page

2150

Last Page

2157