Neutron Reflection Study of Phenol Adsorbed at the Surface of Its Aqueous Solutions:  An Unusual Adsorbed Layer

1998 ◽  
Vol 102 (1) ◽  
pp. 185-192 ◽  
Author(s):  
Z. X. Li ◽  
R. K. Thomas ◽  
A. R. Rennie ◽  
J. Penfold
Keyword(s):  
Aqueous Solutions ◽  
Adsorbed Layer ◽  
Neutron Reflection

Irreversible Adsorption of Polymer Melts

1996 ◽  
Vol 464 ◽  
Author(s):  
U. Sawhney ◽  
C.J. Durning ◽  
B. O'Shaughnessy ◽  
G.S. Smith ◽  
J. Majewski
Keyword(s):  
Room Temperature ◽  
Adsorbed Layer ◽  
Equilibrium Structure ◽  
Pmma Film ◽  
Irreversible Adsorption ◽  
Equilibrium Conditions ◽  
Melt Structure ◽  
Neutron Reflection ◽  
Reflection Data ◽  
Adsorbed Layers

ABSTRACTWe studied the equilibrium architecture of polymer layers strongly adsorbed from the melt. Immobilized layers of poly-(methyl methacrylate) (PMMA) were produced by the following method: 1) The polymer was spin-coated onto silanol bearing surfaces of single crystal and fused quartz, and annealed at melt conditions, 2) The annealed layer was quenched to room temperature (below the glass transition temperature) in order to “freeze in” the melt structure near the substrate, 3) Unbound material was leached away in good solvent (benzene) to leave a residual, strongly-adsorbed layer. The architecture of this layer was studied by neutron reflection. Data on dried adsorbed layers indicates a dense PMMA film whose thickness gradually increases with annealing time in the melt from a minimal value. Evidently, annealing gradually relaxes a rather flat non-equilibrium structure produced by spin-coating. The thicknesses, h, in a series of dry layers annealed long enough to achieve equilibrium conditions in the melt scale as h ∼ N1/2. Data on swollen layers suggest a dilute, extended layer, but the preliminary results cannot give a definitive confirmation of the brush structure predicted by Guiselin.11

Structure of an Adsorbed Layer ofn-Dodecyl-N,N-dimethylamino Acetate at the Air/Solution Interface As Determined by Neutron Reflection

1997 ◽  
Vol 101 (36) ◽  
pp. 7121-7126 ◽  
Author(s):  
J. D. Hines ◽  
P. R. Garrett ◽  
G. K. Rennie ◽  
R. K. Thomas ◽  
J. Penfold
Keyword(s):  
Adsorbed Layer ◽  
Neutron Reflection ◽  
Solution Interface

Direct characterization of adsorbed surfactant layers

Surfactants ◽  
2019 ◽  
pp. 156-174
Author(s):  
Bob Aveyard
Keyword(s):  
Refractive Index ◽  
Layer Thickness ◽  
Quartz Crystal Microbalance ◽  
Adsorbed Layer ◽  
Phase Behaviour ◽  
Aqueous Systems ◽  
Brewster Angle Microscopy ◽  
Physical Investigation ◽  
Neutron Reflection

Some widely used techniques for the direct physical investigation of the structure of adsorbed surfactant films are introduced. Neutron reflection has yielded very detailed information about adsorbed surfactant films, although it is not readily accessible to many researchers. There are however commercial instruments available for a number of other techniques which are to be found in numerous laboratories. Scanning probe microscopies (STM and AFM) are capable of producing quite remarkable images of surfactant layers on solids and clearly show how surfactants form aggregates at surfaces. Ellipsometry is capable of yielding adsorbed layer thickness and refractive index from which composition with respect to solvent and surfactant can be deduced. The quartz crystal microbalance (QCM) and its variant, QCM-D, can give adsorbed amounts (including hydration in aqueous systems). Brewster angle microscopy (BAM) is a useful tool for the visualization of phase behaviour in surfactant films.

Structure and Composition of Dodecane Layers Spread on Aqueous Solutions of Dodecyl- and Hexadecyltrimethylammonium Bromides Studied by Neutron Reflection

1995 ◽  
Vol 99 (12) ◽  
pp. 4113-4123 ◽  
Author(s):  
J. R. Lu ◽  
R. K. Thomas ◽  
B. P. Binks ◽  
P. D. I. Fletcher ◽  
J. Penfold
Keyword(s):  
Aqueous Solutions ◽  
Neutron Reflection

Adsorption of Sodium Dodecyl Sulfate at the Surface of Aqueous Solutions of Poly(vinylpyrrolidone) Studied by Neutron Reflection

Langmuir ◽  
1998 ◽  
Vol 14 (7) ◽  
pp. 1637-1645 ◽  
Author(s):  
I. P. Purcell ◽  
J. R. Lu ◽  
R. K. Thomas ◽  
A. M. Howe ◽  
J. Penfold
Keyword(s):  
Sodium Dodecyl Sulfate ◽  
Aqueous Solutions ◽  
Sodium Dodecyl ◽  
Neutron Reflection ◽  
Dodecyl Sulfate

Adsorption of proteins from aqueous solutions on hydrophobic surfaces studied by neutron reflection

2000 ◽  
Vol 2 (22) ◽  
pp. 5214-5221 ◽  
Author(s):  
G. Fragneto ◽  
T. J. Su ◽  
J. R. Lu ◽  
R. K. Thomas ◽  
A. R. Rennie
Keyword(s):  
Aqueous Solutions ◽  
Hydrophobic Surfaces ◽  
Neutron Reflection

Neutron reflection study of butanol and hexanol adsorbed at the surface of their aqueous solutions

1996 ◽  
Vol 92 (4) ◽  
pp. 565 ◽  
Author(s):  
Z. X. Li ◽  
J. R. Lu ◽  
R. K. Thomas ◽  
A. R. Rennie ◽  
J. Penfold
Keyword(s):  
Aqueous Solutions ◽  
Neutron Reflection
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