A Study of Nonionic Surfactants at the Air−Water Interface by Sum-Frequency Spectroscopy and Ellipsometry

Goates, Steven R.; Schofield, Andreas Vigand; Bain, Colin D.

doi:10.1021/la9809675

Cited by 107 publications

(131 citation statements)

References 33 publications

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“…Already at low SDS concentrations, two CH oscillators were found, at 2873 cm −1 and 2934 cm −1 , respectively. In agreement with other studies [27,69,105,107,108], these bands were assigned to the symmetric stretch of the terminal CH 3 , split by Fermi resonance with an overtone of the CH 3 bending mode. Interestingly, the CH band amplitudes were found to be much smaller compared with those of the alkyl carboxylate monolayers [51] discussed before.…”

Section: Bilayer Formationsupporting

confidence: 92%

In situnon-linear spectroscopic approaches to understanding adsorption at mineral–water interfaces

Schrödle¹,

Richmond²

2008

J. Phys. D: Appl. Phys.

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Over the last decades, significant advances have been made in the study of adsorption processes at mineral-water interfaces. In particular, surface-enhanced infrared (IR) techniques, and, more recently, non-linear vibrational sum-frequency spectroscopy have provided novel insights into the structure and dynamics of these interfaces. The driving forces behind adsorption at mineral substrates are as diverse as the set of commonly encountered adsorbates, which range from simple inorganic ions to organic molecules from the smallest to the largest polymers. Electrostatics, cooperative processes, self-assembly into mesoscopically ordered aggregates and specific chemical interactions all play an important role. In this topical review, particular consideration is given to organic adsorbates including surfactants, because of their eminent technological importance for the modification of surface properties and their omnipresence in the environment. This review demonstrates that non-linear optical methods greatly extend the well-established linear IR techniques and provide many opportunities for surface science to advance our understanding of the structure and dynamics of mineral-water interfaces.

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Section: Bilayer Formationsupporting

confidence: 92%

In situnon-linear spectroscopic approaches to understanding adsorption at mineral–water interfaces

Schrödle¹,

Richmond²

2008

J. Phys. D: Appl. Phys.

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“…Monolayers of nonionic surfactants poly(ethylene glycol) monodecyl ethers (C 12 E m ; m = 2-8) have been examined at the air-water interface (107). The results show an increase in conformational disorder with increasing area per molecule and an apparent decrease in the angle of tilt of the methyl group.…”

Section: Surfactants At the Air-water Interfacementioning

confidence: 99%

STRUCTURE AND BONDING OF MOLECULES AT AQUEOUS SURFACES

Richmond

2001

Annu. Rev. Phys. Chem.

246

211

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Significant advances toward understanding the structure of aqueous surfaces on a molecular level have been made in recent years. This review focuses on the recent contributions of surface vibrational sum frequency spectroscopy (VSFS) to this field of study. An overview of recent VSFS studies of the molecular structure and orientation of molecules at the vapor-water interface and the interface between water and an immiscible organic liquid is presented, with particular emphasis on studies that compare the molecular properties and adsorbate behavior at these two different but related interfaces. This discussion is preceded by a general introduction to VSFS studies at aqueous surfaces and a description of the fundamental principles underlying the technique.

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“…With a detailed neutron reflectivity study not only the surface excess but also the monolayer thickness and its roughness were obtained [36]. Moreover, by using sum-frequency spectroscopy and ellipsometry the conformation of the C 12 E 6 molecules at the air/water surface is known [37]. What is still missing, however, is the corresponding data for the adsorption (adsorption isotherms) of C 12 E 6 at a silanated glass and a thiolated gold surfaces, respectively.…”

Section: Final Remarksmentioning

confidence: 99%

Comparison between Interaction Forces at Air/Liquid and Solid/Liquid Interfaces in the Presence of Non-Ionic Surfactants

Schlarmann

Rojas

Claesson

2004

Tenside Surfactants Detergents

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Interactions in thin liquid foam films and between solid/liquid surfaces coated with the non-ionic surfactant hexaoxyethylene dodecylether (C 12 E 6) were investigated with a TFPB (thin film pressure balance) and the MASIF (Measurement and Analysis of Surface Interaction Forces) technique, respectively. For foam films the formation of common black films (CBF) and Newton black films (NBF) was observed depending on the surfactant concentration and the applied pressure. With increasing surfactant concentration and increasing pressure the CBF is destabilized, whereas a stabilization of the NBF is observed. In addition, MASIF measurements with two different hydrophobic surfaces were made. In one case silanated glass surfaces and in the other case thiolated gold surfaces were used. Differences and similarities of the interactions between these two surfaces are shown and discussed. Furthermore, the results of the MASIF measurements are compared with the ones of the thin film pressure balance measurements and the influence of the surfactant concentration on the interactions is discussed.

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A Study of Nonionic Surfactants at the Air−Water Interface by Sum-Frequency Spectroscopy and Ellipsometry

Cited by 107 publications

References 33 publications

In situnon-linear spectroscopic approaches to understanding adsorption at mineral–water interfaces

In situnon-linear spectroscopic approaches to understanding adsorption at mineral–water interfaces

STRUCTURE AND BONDING OF MOLECULES AT AQUEOUS SURFACES

Comparison between Interaction Forces at Air/Liquid and Solid/Liquid Interfaces in the Presence of Non-Ionic Surfactants

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