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Titolo:
Influence of water-soluble polymers on the shear-induced structure formation in lyotropic lamellar phases
Autore:
Berghausen, J; Zipfel, J; Lindner, P; Richtering, W;
Indirizzi:
Univ Kiel, Inst Phys Chem, D-24098 Kiel, Germany Univ Kiel Kiel Germany D-24098 el, Inst Phys Chem, D-24098 Kiel, Germany Univ Freiburg, Inst Makromol Chem, D-79104 Freiburg, Germany Univ Freiburg Freiburg Germany D-79104 l Chem, D-79104 Freiburg, Germany Inst Max Von Laue Paul Langevin, Grenoble, France Inst Max Von Laue Paul Langevin Grenoble France gevin, Grenoble, France
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 45, volume: 105, anno: 2001,
pagine: 11081 - 11088
SICI:
1520-6106(20011115)105:45<11081:IOWPOT>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
MULTILAMELLAR VESICLES; NEUTRON-SCATTERING; BLOCK-COPOLYMERS; X-RAY; FLUID MEMBRANES; SURFACTANT; SYSTEM; POLY(N-ISOPROPYLACRYLAMIDE); POLYELECTROLYTE; TRANSITION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
52
Recensione:
Indirizzi per estratti:
Indirizzo: Richtering, W Univ Kiel, Inst Phys Chem, Olshaussenstr 40, D-24098 Kiel, Germany Univ Kiel Olshaussenstr 40 Kiel Germany D-24098 el, Germany
Citazione:
J. Berghausen et al., "Influence of water-soluble polymers on the shear-induced structure formation in lyotropic lamellar phases", J PHYS CH B, 105(45), 2001, pp. 11081-11088

Abstract

The shear-induced structure formation in lyotropic lamellar phases containing water-soluble polymers is investigated. The lyotropic phases consisted of sodium dodecyl sulfate/ 1-decanol/D2O and were mixed either with poly(n-isopropylacrylamide) (PNIPAM), hydroxyethyl starch (HES), poly(vinyl caprolactame) (PVCa), or poly(ethylenglycol)distearate (PEG-DS). Rheo-optical experiments (flow birefringence and small-angle light scattering, SALS) as well as small-angle neutron scattering (SANS) combined with a commercial rheometer were used to observe structural changes, e.g., layer reorientation or formation of multilamellar vesicles (liposomes). Equilibrium properties of the lamellar phases were investigated using quasi elastic light scattering (QELS) and static SANS, the latter was analyzed using a model proposed by Nallet et al. The polymer addition led to a viscosity increase but the flipping of aligned lamellae from parallel to perpendicular orientation was hardly affected by the polymers. The shear-induced formation of multilamellar vesicles (MLV), however, was strongly influenced by the macromolecules. The addition of small amounts of PNIPAM shifted the region where vesicles are formed to samples with higher decanol contents whereas HES, PVCa, and PEG-DSsuppressed the MLV formation in all cases. Results from SANS and QELS indicate a possible correlation between the shear-induced vesicle formation andthe viscoelastic properties of the surfactant bilayer.

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Documento generato il 30/05/20 alle ore 15:01:15