Influence of the Shear Rate on the Small-Angle Neutron Scattering Pattern of Polyelectrolyte Solutions:  The Xanthan Example

1996 ◽  
Vol 29 (1) ◽  
pp. 473-474 ◽  
Author(s):  
M. Milas ◽  
P. Lindner ◽  
M. Rinaudo ◽  
R. Borsali
Keyword(s):  
Shear Rate ◽  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Scattering Pattern ◽  
Polyelectrolyte Solutions

Effects of Shear on the Structures in a System of Small Rodlike Micelles

1994 ◽  
Vol 376 ◽  
Author(s):  
Paul D. Butler ◽  
L.J. Magid ◽  
William A. Hamilton ◽  
P.J. Kreke ◽  
Johnb. Hayter
Keyword(s):  
Shear Rate ◽  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Supporting Electrolyte ◽  
Type Ii ◽  
Spherical Micelles ◽  
Shear Induced Structure ◽  
Induced Structure

ABSTRACTWe have used small angle neutron scattering (SANS) to study solutions of cetyltrimethylammonium 2,6-dichlorobenzoate (2,6) at rest and as a function of shear. These solutions are Newtonian, and up to a concentration of at least 100mM contain spherical micelles. Comparison with viscoelastic solutions of the closely related, and much studied, cetyltrimethylammonium 3,5-dichlorobenzoate (3,5) is made. While spheres are not expected to align under shear, a shear induced sphere to rod transition has been postulated for this system. In the results presented here, no shear induced sphere to rod transition was observed even at the highest accessible shear rate. Addition of sufficient supporting electrolyte (up to 1M NaCl) does cause such a transition in the quiescent solution. Hoffmann et al. have seen what they refer to as the formation of a shear induced structure (SIS or type II micelles) on similar systems where short rods form in the absence of supporting electrolyte. Shearing of the salted system produces rapid though not spectacular alignment, with no evidence of a SIS forming.

Small Angle Neutron Scattering from Polyelectrolyte Solutions: From Disordered to Ordered Xanthan Chain Conformation

1995 ◽  
Vol 28 (9) ◽  
pp. 3119-3124 ◽  
Author(s):  
Michel Milas ◽  
Marguerite Rinaudo ◽  
Robert Duplessix ◽  
Redouane Borsali ◽  
Peter Lindner
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Chain Conformation ◽  
Polyelectrolyte Solutions

A Method for Interpreting Small Angle Neutron Scattering Data from Quasi-Spherical Objects

1994 ◽  
Vol 376 ◽  
Author(s):  
T.M. Sabine ◽  
W.K. Bertram ◽  
L.P. Aldridge
Keyword(s):  
Neutron Scattering ◽  
Multiple Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Small Angle Scattering ◽  
Scattering Data ◽  
Type Function ◽  
Scattering Pattern ◽  
Angle Scattering

ABSTRACTSmall angle scattering data are traditionally interpreted in terms of scattering patterns at the Porod and the Guinier limits. It is difficult to fit the entire scattering pattern to account for scattering from spheres because Rayleigh's formula contains oscillatory terms which are smeared out in practice by perturbations in the sizes of the scattering agents.It is proposed that a Lorenztian type function be used instead of Rayleigh's function. By using this equation it is possible to fit the entire small angle scattering pattern and obtain the correct forms of the Guinier and Porod limits.The effects of correlation and multiple scattering are also explored.

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