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

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

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.

Adsorption of poly(ethylene oxide) at the air-solution interface studied by neutron reflection

1989 ◽  
Vol 22 (8) ◽  
pp. 3466-3475 ◽  
Author(s):  
A. R. Rennie ◽  
R. J. Crawford ◽  
E. M. Lee ◽  
R. K. Thomas ◽  
T. L. Crowley ◽  
...  
Keyword(s):  
Ethylene Oxide ◽  
Neutron Reflection ◽  
Solution Interface ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

Phase Transition in the Adsorbed Layer of Catanionic Surfactants at the Air/Solution Interface

Langmuir ◽  
2000 ◽  
Vol 16 (7) ◽  
pp. 3200-3205 ◽  
Author(s):  
Tibor Gilányi ◽  
Róbert Mészáros ◽  
Imre Varga
Keyword(s):  
Phase Transition ◽  
Adsorbed Layer ◽  
Catanionic Surfactants ◽  
Solution Interface

Neutron Reflection from the Liquid−Liquid Interface:  Adsorption of Hexadecylphosphorylcholine to the Hexadecane−Aqueous Solution Interface

Langmuir ◽  
2005 ◽  
Vol 21 (25) ◽  
pp. 11704-11709 ◽  
Author(s):  
Ali Zarbakhsh ◽  
Aránzazu Querol ◽  
James Bowers ◽  
M. Yaseen ◽  
Jian R. Lu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Liquid Interface ◽  
Neutron Reflection ◽  
Solution Interface

The Structure of Monododecyl Pentaethylene Glycol Monolayers with and without Added Dodecane at the Air/Solution Interface:  A Neutron Reflection Study

1998 ◽  
Vol 102 (30) ◽  
pp. 5785-5793 ◽  
Author(s):  
J. R. Lu ◽  
Z. X. Li ◽  
R. K. Thomas ◽  
B. P. Binks ◽  
D. Crichton ◽  
...  
Keyword(s):  
Neutron Reflection ◽  
Solution Interface ◽  
Pentaethylene Glycol

Template mediated crystal engineering

1994 ◽  
Vol 52 ◽  
pp. 480-481
Author(s):  
Brigid R. Heywood ◽  
S. Champ
Keyword(s):  
Crystal Engineering ◽  
Electrostatic Interactions ◽  
Alkyl Chain ◽  
Crystallographic Axis ◽  
Two Dimensional ◽  
Engineering Process ◽  
Solution Interface ◽  
Extensive Program ◽  
Geometric Homology ◽  
Long Alkyl Chain

Recent work on the crystallisation of inorganic crystals under compressed monomolecular surfactant films has shown that two dimensional templates can be used to promote the oriented nucleation of solids. When a suitable long alkyl chain surfactant is cast on the crystallisation media a monodispersied population of crystals forms exclusively at the monolayer/solution interface. Each crystal is aligned with a specific crystallographic axis perpendicular to the plane of the monolayer suggesting that nucleation is facilitated by recognition events between the nascent inorganic solid and the organic template.For example, monolayers of the long alkyl chain surfactant, stearic acid will promote the oriented nucleation of the calcium carbonate polymorph, calcite, on the (100) face, whereas compressed monolayers of n-eicosyl sulphate will induce calcite nucleation on the (001) face, (Figure 1 & 2). An extensive program of research has confirmed the general principle that molecular recognition events at the interface (including electrostatic interactions, geometric homology, stereochemical complementarity) can be used to promote the crystal engineering process.

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