Thermodynamics of Ionized Monolayers: Surface Manometry on Very Low Density Spread Monolayers of Sodium Octadecyl Sulfate at the Air/Water Interface and Analysis of Ionic Double Layer Contributions to the Isotherms

2011 ◽  
Vol 115 (16) ◽  
pp. 8056-8063 ◽  
Author(s):  
S. R. Middleton ◽  
N. R. Pallas ◽  
J. Mingins ◽  
B. A. Pethica
Keyword(s):  
Double Layer ◽  
Low Density ◽  
Water Interface ◽  
Air Water Interface ◽  
Ionic Double Layer

Low-density hydrogen-bonded networks in crystals and at the air/water interface

2000 ◽  
pp. 769-770 ◽  
Author(s):  
David J. Plaut ◽  
Kristian M. Lund ◽  
Michael D. Ward
Keyword(s):  
Low Density ◽  
Water Interface ◽  
Air Water Interface ◽  
Hydrogen Bonded

Surface properties of hen egg yolk low-density lipoproteins spread at the air–water interface

2003 ◽  
Vol 31 (1-4) ◽  
pp. 185-194 ◽  
Author(s):  
Virginie Martinet ◽  
Patrick Saulnier ◽  
Valérie Beaumal ◽  
Jean-Luc Courthaudon ◽  
Marc Anton
Keyword(s):  
Surface Properties ◽  
Egg Yolk ◽  
Low Density Lipoproteins ◽  
Low Density ◽  
Water Interface ◽  
Air Water Interface ◽  
Hen Egg Yolk ◽  
Hen Egg

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.

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