Interactions between Nonpolar Surfaces Coated with the Nonionic Surfactant Hexaoxyethylene Dodecyl Ether C12E6and the Origin of Surface Charges at the Air/Water Interface

Langmuir ◽  
2004 ◽  
Vol 20 (12) ◽  
pp. 4977-4988 ◽  
Author(s):  
Cosima Stubenrauch ◽  
Orlando J. Rojas ◽  
Judith Schlarmann ◽  
Per M. Claesson
Keyword(s):  
Nonionic Surfactant ◽  
Water Interface ◽  
Surface Charges ◽  
Air Water Interface ◽  
Dodecyl Ether

scholarly journals Surfactant/biosurfactant mixing: Adsorption of saponin/nonionic surfactant mixtures at the air-water interface

2020 ◽  
Vol 574 ◽  
pp. 385-392 ◽  
Author(s):  
I.M. Tucker ◽  
A. Burley ◽  
R.E. Petkova ◽  
S.L. Hosking ◽  
R.K. Thomas ◽  
...  
Keyword(s):  
Nonionic Surfactant ◽  
Water Interface ◽  
Surfactant Mixtures ◽  
Air Water Interface

Temperature Resistant Binary SLES/Nonionic Surfactant Mixtures at the Air/Water Interface

Langmuir ◽  
2018 ◽  
Vol 34 (32) ◽  
pp. 9442-9452
Author(s):  
Charles Smith ◽  
Jian R. Lu ◽  
Ian M. Tucker ◽  
David Grainger ◽  
Peixun Li ◽  
...  
Keyword(s):  
Nonionic Surfactant ◽  
Water Interface ◽  
Surfactant Mixtures ◽  
Air Water Interface

Forces between a monolayer at an air/water interface and a particle in solution: influence of the sign of the surface charges and the subphase salt concentration

Soft Matter ◽  
2011 ◽  
Vol 7 (21) ◽  
pp. 10182 ◽  
Author(s):  
Cathy E. McNamee ◽  
Michael Kappl ◽  
Hans-Jürgen Butt ◽  
Javed Ally ◽  
Hayato Shigenobu ◽  
...  
Keyword(s):  
Salt Concentration ◽  
Water Interface ◽  
Surface Charges ◽  
Air Water Interface

The Determination of the Structure and Coverage of Nonionic Surfactant Monolayers at the Air-Water Interface Using Neutron Reflection Technique

1994 ◽  
Vol 376 ◽  
Author(s):  
Jian R. Lu ◽  
Robert K. Thomas
Keyword(s):  
Nonionic Surfactant ◽  
Gaussian Distribution ◽  
Water Interface ◽  
Surfactant Monolayers ◽  
Neutron Reflection ◽  
Air Water Interface ◽  
Oligoethylene Glycols

ABSTRACTThe coverage and structure of the monododecyl ethers of oligoethylene glycols, C12Em where m = 2, 4, 6 and 8, adsorbed at the air-water interface have been studied by neutron reflection. At their c.m.c.s, the area per molecule is 33 ± 3 Å2 for C12E2, 44 ± 3 Å2 for C12E4 55 ± 3 Å2 for C12E6 and 62 ± 3 Å2 for C12E8. In terms of the width of a Gaussian distribution at 1/e of its height the thicknesses of the dodecyl chains are found to be constant at 16 ± 2 Å and those of the heads to vary from 11 to 19±2Å from m = 2 to 8. There is also found to be some overlap between the two chains at the interface.

Hydration of DPPC Monolayers at the Air/Water Interface and Its Modulation by the Nonionic Surfactant C12E4: A Neutron Reflection Study

Langmuir ◽  
1995 ◽  
Vol 11 (10) ◽  
pp. 3948-3952 ◽  
Author(s):  
C. Naumann ◽  
T. Brumm ◽  
A. R. Rennie ◽  
J. Penfold ◽  
T. M. Bayerl
Keyword(s):  
Nonionic Surfactant ◽  
Water Interface ◽  
Neutron Reflection ◽  
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.

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