scholarly journals The growth of micelles, and the transition to bilayers, in mixtures of a single-chain and a double-chain cationic surfactant investigated with small-angle neutron scattering

Soft Matter ◽  
2011 ◽  
Vol 7 (22) ◽  
pp. 10935 ◽  
Author(s):  
L. Magnus Bergström ◽  
Sara Skoglund ◽  
Katrin Danerlöv ◽  
Vasil M. Garamus ◽  
Jan Skov Pedersen
Keyword(s):  
Neutron Scattering ◽  
Cationic Surfactant ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Single Chain ◽  
Double Chain

VESICLE TO MICELLE TRANSITION DRIVEN BY SURFACE SOLID-FLUID TRANSITION

2002 ◽  
Vol 16 (01n02) ◽  
pp. 375-382 ◽  
Author(s):  
JANAKY NARAYANAN ◽  
E. MENDES ◽  
C. MANOHAR
Keyword(s):  
Small Angle ◽  
Fluorescence Anisotropy ◽  
Small Angle Neutron Scattering ◽  
Unique Feature ◽  
Ion Pair ◽  
Single Chain ◽  
Double Chain ◽  
Micellar Phase ◽  
Curvature Energy ◽  
Oppositely Charged

This paper reviews the solution behavior of cetyltrimethylammonium hydroxynaphthalene carboxylate (CTAHNC), which has the unique feature of undergoing a transition from vesicle to worm-like micellar phase in three different ways, namely, increase in temperature, addition of a surfactant and on shearing. Fluorescence anisotropy, NMR, rheology, small angle neutron scattering studies etc gave evidence of the vesicle-micelle transition. CTAHNC can be looked upon as a complex formed by two oppositely charged surfactants (CTA+ and HNC-). This ion pair effectively acts as a double-chain lipid and has a tendency to form vesicles. On increasing the temperature, and/or adding single chain surfactants of shearing, the complex dissociates which changes the curvature energy of the surface. This leads to a 'surface melting' that brings forth the vesicle-micelle transition.

scholarly journals Morphology of crystalline–amorphous olefin block copolymers in solution characterized by small-angle neutron scattering and microscopy

2015 ◽  
Vol 48 (6) ◽  
pp. 1860-1869 ◽  
Author(s):  
Aurel Radulescu ◽  
Günter Goerigk ◽  
Lewis Fetters ◽  
Dieter Richter
Keyword(s):  
Block Copolymers ◽  
Neutron Scattering ◽  
Small Angle ◽  
Self Assembly ◽  
Small Angle Neutron Scattering ◽  
Chain Structure ◽  
Hierarchical Organization ◽  
Single Chain ◽  
Scanning Calorimetry ◽  
Assembly Behavior

The single-chain properties and self-assembly behavior in dilute solution of olefin block copolymers obtained by chain-shuttling technology and consisting of alternating crystallizable and amorphous ethylene/1-octene blocks were investigated by pinhole and focusing small-angle neutron scattering techniques, optical microscopy in bright-field and crossed-polarizer modes, and differential scanning calorimetry. The complex hydrocarbon soluble (precipitant free) macro-aggregates formed with decreasing temperature are characterized by spherulitic textures. The spherulites yield, on one hand, a morphology that depends on the chain structure properties and, on the other hand, multiple structural levels with a hierarchical organization that ranges from 10 Å up to tens of micrometres. This morphology displays peculiarities dictated by the polydisperse character of these materials.

Small-Angle Neutron Scattering (SANS) Study of Vesicles and Lamellar Sheets Formed from Mixtures of an Anionic and a Cationic Surfactant

1999 ◽  
Vol 103 (45) ◽  
pp. 9888-9897 ◽  
Author(s):  
Magnus Bergström ◽  
Jan Skov Pedersen ◽  
Peter Schurtenberger ◽  
Stefan U. Egelhaaf
Keyword(s):  
Neutron Scattering ◽  
Cationic Surfactant ◽  
Small Angle ◽  
Small Angle Neutron Scattering

Single-chain dimensions in semidilute ionomer solutions: small-angle neutron scattering study

1989 ◽  
Vol 22 (9) ◽  
pp. 3746-3751 ◽  
Author(s):  
B. Gabrys ◽  
J. S. Higgins ◽  
C. W. Lantman ◽  
W. J. MacKnight ◽  
A. M. Pedley ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Single Chain ◽  
Scattering Study ◽  
Neutron Scattering Study

Small-Angle Neutron Scattering Studies of Low Polarity Telechelic Ionomer Solutions. 2. Single Chain Scattering

1997 ◽  
Vol 30 (24) ◽  
pp. 7444-7455 ◽  
Author(s):  
Eleni Karayianni ◽  
Robert Jérôme ◽  
Stuart L. Cooper
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Single Chain
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