Structure of aqueous decyltrimethylammonium bromide solutions at the air water interface studied by the specular reflection of neutrons

1989 ◽  
Vol 93 (1) ◽  
pp. 381-388 ◽  
Author(s):  
E. M. Lee ◽  
R. K. Thomas ◽  
J. Penfold ◽  
R. C. Ward
Keyword(s):  
Specular Reflection ◽  
Water Interface ◽  
Decyltrimethylammonium Bromide ◽  
Air Water Interface ◽  
Bromide Solutions

The Study of Surfaces and Interfaces on the Reflectometer Crisp at the Isis Pulsed Neutron Source

1989 ◽  
Vol 166 ◽  
Author(s):  
J Penfold
Keyword(s):  
Neutron Source ◽  
Specular Reflection ◽  
Experimental Results ◽  
Water Interface ◽  
Surfaces And Interfaces ◽  
Air Water Interface ◽  
Pulsed Neutron ◽  
Pulsed Neutron Source

ABSTRACTThe study of surfaces and interfaces using the specular reflection of neutrons on the reflectometer CRISP at the ISIS pulsed neutron source is discussed. The instrumentation, is briefly described, and the performance of the spectrometer being illustrated by some standard examples. Recent experimental results on the adsorption of surfactants at the air-water interface will be presented.

Surface Ordering in Dilute Dihexadecyl Dimethyl Ammonium Bromide Solutions at the Air−Water Interface

Langmuir ◽  
2004 ◽  
Vol 20 (6) ◽  
pp. 2265-2269 ◽  
Author(s):  
J. Penfold ◽  
D. S. Sivia ◽  
E. Staples ◽  
I. Tucker ◽  
R. K. Thomas
Keyword(s):  
Ammonium Bromide ◽  
Water Interface ◽  
Surface Ordering ◽  
Air Water Interface ◽  
Dimethyl Ammonium ◽  
Bromide Solutions

The structure of aqueous tetramethylammonium dodecylsulphate solutions at the air-water interface studied by the specular reflection of neutrons

1989 ◽  
Vol 68 (1) ◽  
pp. 33-47 ◽  
Author(s):  
J. Penfold ◽  
E.M. Lee ◽  
R.K. Thomas
Keyword(s):  
Specular Reflection ◽  
Water Interface ◽  
Air Water Interface

Sampling and analysis of the air-water interface with SEM and EDS of microlayers

1989 ◽  
Vol 47 ◽  
pp. 1004-1005
Author(s):  
Randall W. Smith ◽  
John Dash
Keyword(s):  
Heavy Metals ◽  
Surface Microlayer ◽  
Surface Films ◽  
Water Interface ◽  
Physical Processes ◽  
Infrared Spectroscopic Analysis ◽  
Eds Analysis ◽  
Air Water Interface ◽  
Significant Area ◽  
Bulk Chemical

The structure of the air-water interface forms a boundary layer that involves biological ,chemical geological and physical processes in its formation. Freshwater and sea surface microlayers form at the air-water interface and include a diverse assemblage of organic matter, detritus, microorganisms, plankton and heavy metals. The sampling of microlayers and the examination of components is presently a significant area of study because of the input of anthropogenic materials and their accumulation at the air-water interface. The neustonic organisms present in this environment may be sensitive to the toxic components of these inputs. Hardy reports that over 20 different methods have been developed for sampling of microlayers, primarily for bulk chemical analysis. We report here the examination of microlayer films for the documentation of structure and composition.Baier and Gucinski reported the use of Langmuir-Blogett films obtained on germanium prisms for infrared spectroscopic analysis (IR-ATR) of components. The sampling of microlayers has been done by collecting fi1ms on glass plates and teflon drums, We found that microlayers could be collected on 11 mm glass cover slips by pulling a Langmuir-Blogett film from a surface microlayer. Comparative collections were made on methylcel1ulose filter pads. The films could be air-dried or preserved in Lugol's Iodine Several slicks or surface films were sampled in September, 1987 in Chesapeake Bay, Maryland and in August, 1988 in Sequim Bay, Washington, For glass coverslips the films were air-dried, mounted on SEM pegs, ringed with colloidal silver, and sputter coated with Au-Pd, The Langmuir-Blogett film technique maintained the structure of the microlayer intact for examination, SEM observation and EDS analysis were then used to determine organisms and relative concentrations of heavy metals, using a Link AN 10000 EDS system with an ISI SS40 SEM unit. Typical heavy microlayer films are shown in Figure 3.

Chemical reactivity of organized monolayers at the air-water interface

1988 ◽  
Vol 85 ◽  
pp. 1041-1045 ◽  
Author(s):  
Rolf Loschek ◽  
Dietmar Mobius
Keyword(s):  
Chemical Reactivity ◽  
Water Interface ◽  
Air Water Interface

Adsorption kinetics of nonanediol and nonane dicarbonic acid at the air/water interface

1982 ◽  
Vol 79 ◽  
pp. 387-393 ◽  
Author(s):  
P. Joos ◽  
G. Bleys ◽  
G. Petre
Keyword(s):  
Adsorption Kinetics ◽  
Water Interface ◽  
Air Water Interface ◽  
Kinetics Of ◽  
Dicarbonic Acid

Temperature Dependence of the Air/Water Interface Revealed by Polarization Sensitive Sum-Frequency Generation Spectroscopy

2018 ◽  
Author(s):  
Daniel R. Moberg ◽  
Shelby C. Straight ◽  
Francesco Paesani
Keyword(s):  
Temperature Dependence ◽  
Low Frequency ◽  
Potential Energy Function ◽  
Md Simulations ◽  
Sum Frequency Generation ◽  
Water Molecules ◽  
Water Interface ◽  
Sum Frequency ◽  
Air Water Interface ◽  
Frequency Generation

<div> <div> <div> <p>The temperature dependence of the vibrational sum-frequency generation (vSFG) spectra of the the air/water interface is investigated using many-body molecular dynamics (MB-MD) simulations performed with the MB-pol potential energy function. The total vSFG spectra calculated for different polarization combinations are then analyzed in terms of molecular auto-correlation and cross-correlation contributions. To provide molecular-level insights into interfacial hydrogen-bonding topologies, which give rise to specific spectroscopic features, the vSFG spectra are further investigated by separating contributions associated with water molecules donating 0, 1, or 2 hydrogen bonds to neighboring water molecules. This analysis suggests that the low frequency shoulder of the free OH peak which appears at ∼3600 cm−1 is primarily due to intermolecular couplings between both singly and doubly hydrogen-bonded molecules. </p> </div> </div> </div>

Cadmium-based nanocrystals and nanocomposites at the air-water interface

2009 ◽  
Author(s):  
Matthew Dave Goodman
Keyword(s):  
Water Interface ◽  
Air Water Interface

Surface Activity of Newly Nonionic Surfactants at Air/Water Interface and their Interaction with Clay and Teflon

2008 ◽  
Vol 45 (3) ◽  
pp. 137-143 ◽  
Author(s):  
R. Abdel-Rahem ◽  
A. S. Ayesh
Keyword(s):  
Surface Activity ◽  
Nonionic Surfactants ◽  
Water Interface ◽  
Air Water Interface
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