Neutron Reflectivity Studies of the Adsorption of Aerosol-OT at the Air/Water Interface:  The Surface Excess

Langmuir ◽  
1997 ◽  
Vol 13 (14) ◽  
pp. 3681-3685 ◽  
Author(s):  
Z. X. Li ◽  
J. R. Lu ◽  
R. K. Thomas
Keyword(s):  
Neutron Reflectivity ◽  
Water Interface ◽  
Surface Excess ◽  
Aerosol Ot ◽  
Air Water Interface

In situ neutron reflectivity studies of the adsorption of DNA by charged diblock copolymer monolayers at the air–water interface

Soft Matter ◽  
2012 ◽  
Vol 8 (27) ◽  
pp. 7161 ◽  
Author(s):  
Po-Wei Yang ◽  
Tsang-Lang Lin ◽  
I-Ting Liu ◽  
Yuan Hu ◽  
Michael James
Keyword(s):  
Diblock Copolymer ◽  
Neutron Reflectivity ◽  
Water Interface ◽  
Air Water Interface

scholarly journals Smart nanogels at the air/water interface: structural studies by neutron reflectivity

Nanoscale ◽  
2016 ◽  
Vol 8 (9) ◽  
pp. 4951-4960 ◽  
Author(s):  
Katarzyna Zielińska ◽  
Huihui Sun ◽  
Richard A. Campbell ◽  
Ali Zarbakhsh ◽  
Marina Resmini
Keyword(s):  
Neutron Reflectivity ◽  
Water Interface ◽  
Structural Studies ◽  
Air Water Interface ◽  
Interfacial Behaviour ◽  
Cross Linker

Structure of the NIPAM-based nanogels at the air/water interface. Nanogel interfacial behaviour was correlated with and their morphology determined mostly by the amount of cross-linker.

Specular and Off-Specular Neutron Reflectivity of a Low Molecular Weight Polystyrene Surfactant at the Air-Water Interface

1994 ◽  
Vol 98 (23) ◽  
pp. 5935-5942 ◽  
Author(s):  
P. M. Saville ◽  
I. R. Gentle ◽  
J. W. White ◽  
J. Penfold ◽  
J. R. P. Webster
Keyword(s):  
Molecular Weight ◽  
Low Molecular Weight ◽  
Neutron Reflectivity ◽  
Water Interface ◽  
Air Water Interface

scholarly journals Specific Ion Effects of Dodecyl Sulfate Surfactants with Alkali Ions at the Air–Water Interface

Molecules ◽  
2019 ◽  
Vol 24 (16) ◽  
pp. 2911 ◽  
Author(s):  
Weißenborn ◽  
Braunschweig
Keyword(s):  
Electric Field ◽  
Resonance Frequency ◽  
Sodium Dodecyl ◽  
Head Group ◽  
Water Interface ◽  
Surface Excess ◽  
Layer Potential ◽  
Air Water Interface ◽  
Dodecyl Sulfate ◽  
Na Ions

The influence of Li+, Na+ and Cs+ cations on the surface excess and structure of dodecyl sulfate (DS−) anions at the air–water interface was investigated with the vibrational sum-frequency generation (SFG) and surface tensiometry. Particularly, we have addressed the change in amplitude and frequency of the symmetric S-O stretching vibrations as a function of electrolyte and DS− concentration in the presence of Li+, Na+ and Cs+ cations. For the Li+ and Na+ ions, we show that the resonance frequency is shifted noticeably from 1055 cm−1 to 1063 cm−1 as a function of the surfactants’ surfaces excess, which we attribute to the vibrational Stark effect within the static electric field at the air–water interface. For Cs+ ions the resonance frequency is independent of the surfactant concentration with the S-O stretching band centered at 1063 cm−1. This frequency is identical to the frequency at the maximum surface excess when Li+ and Na+ ions are present and points to the ion pair formation between the sulfate headgroup and Cs+ counterions, which reduces the local electric field. In addition, SFG experiments of the O-H stretching bands of interfacial H2O molecules are used in order to calculate the apparent double layer potential and the degree of dissociation between the surfactant head group and the investigated cations. The latter was found to be 12.0%, 10.4% and 7.7% for lithium dodecyl sulfate (LiDS), sodium dodecyl sulfate (SDS) and cesium dodecyl sulfate (CsDS) surfactants, which is in agreement with Collins ‘rule of matching water affinities’.

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