Rheological behaviour of polyoxometalate-doped lyotropic lamellar phases.
We study the influence of nanoparticle doping on the lyotropic liquid crystalline phase of the industrial surfactant Brij®30 (C₁₂E₄) and water, doped with spherical polyoxometalate nanoparticles smaller than the characteristic dimensions of the host lamellar phase. We present viscometry and in situ rheology coupled with small-angle X-ray scattering data that show that, with increasing doping concentration, the nanoparticles act to decrease the shear viscosity of the lamellar phase, and that a shear-induced transition to a multilamellar vesicle "onion" phase is pushed to higher shear rates, and in some cases completely suppressed. X-ray data reveal that the nanoparticles remain encapsulated within the membranes of the vesicles, thus indicating a viable method for the fabrication of nanoparticle incorporating organic vesicles.
Laboratoire de Physique des Solides-UMR 8502-Université Paris-Sud, F-91405, Orsay, France. j.desilva@physics.org
J P
JP
de Silva
A S
AS
Poulos
B
B
Pansu
P
P
Davidson
B
B
Kasmi
D
D
Petermann
S
S
Asnacios
F
F
Meneau
M
M
Impéror
D050866:Liquid Crystals / Q000737:chemistry*; D008560:Membrane Fluidity; D053758:Nanoparticles / Q000737:chemistry*; D010316:Particle Size; D012212:Rheology / Q000379:methods*; D053838:Scattering, Small Angle; D013499:Surface Properties; D013501:Surface-Active Agents / Q000737:chemistry*; D017973:Tungsten Compounds / Q000737:chemistry*; D014783:Viscosity; D014867:Water / Q000737:chemistry; D014961:X-Ray Diffraction; D000099294:Polyoxometalates
D013501:Surface-Active Agents; D017973:Tungsten Compounds; D014867:Water; C102296:polyoxometalate I; D000099294:Polyoxometalates
Langmuir. 2004 May 11;20(10):3947-53
15969384
Eur Phys J E Soft Matter. 2007 Oct;24(2):129-37
17985074
Phys Rev E Stat Nonlin Soft Matter Phys. 2004 Feb;69(2 Pt 1):021504
14995446
Langmuir. 2007 May 8;23(10):5270-4
17439163
Science. 1996 Feb 16;271(5251):969-73
8584932
Langmuir. 2010 Mar 16;26(6):3835-42
20214389
Langmuir. 2008 Jun 17;24(12):6285-91
18479154
Phys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics. 1995 Apr;51(4):3296-3299
9963007
Eur Phys J E Soft Matter. 2008 Jan;25(1):91-101
18309459
J Phys Chem B. 2010 Jan 14;114(1):220-7
19968315