Kinetics of Triton-X100 Transfer Across the Water/Dodecane Interface: Analysis of the Interfacial Tension Variation

Gassin, Pierre-Marie; Martin-Gassin, Gaëlle; Meyer, Daniel; Dufrêche, Jean‐François; Diat, Olivier

doi:10.1021/jp302514k

Cited by 26 publications

(23 citation statements)

References 44 publications

(71 reference statements)

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“…We do note that this analysis is oversimplified. A kinetically limited adsorption relating the surface coverage of surfactant molecules and the contact time has been resolved. − However, lacking the relationship between the dynamic surface tension and the surface coverage prevents us from fitting the results here.…”

Section: Resultsmentioning

confidence: 99%

Coassembly Kinetics of Graphene Oxide and Block Copolymers at the Water/Oil Interface

et al. 2017

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The coassembly kinetics of graphene oxide (GO) nanosheets and diblock copolymers at the water/toluene interface is probed by tracking the dynamic interfacial tension using pendant drop tensiometry. The diblock copolymer significantly enhances the surfactancy of the GO nanosheets at the interface. It is found that diblock copolymers rapidly adsorb to the water/toluene interface and enhance the adsorption affinity of GO nanosheets to the interface. The continuous adsorption of GO at the interface leads to a random loose packing state, at which the adsorbed GO and diblock copolymers start to form an elastic film. After this transition, GO continues to adsorb to the interface, however, at a much slower speed, yielding a more solidlike elastic film in the long time equilibrium limit.

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Section: Resultsmentioning

confidence: 99%

Coassembly Kinetics of Graphene Oxide and Block Copolymers at the Water/Oil Interface

et al. 2017

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“…Interface specific experimental probes, such as vibrational sum frequency generation (VSFG) spectroscopy, [37][38][39] x-ray reflectivity (XR), [27][28][29][30][31] grazing incidence x-ray diffraction (GID), [33][34]40 second harmonic generation (SHG) spectroscopy, 35 and neutron reflectivity (NR) 36 have been shown to be very useful to investigate interfacial amphiphile ion interactions. The combination of VSFG, XR, and GID is especially useful in elucidating complementary aspects of the interfacial solute and solvent structures.…”

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confidence: 99%

The Role of Specific Ion Effects in Ion Transport: The Case of Nitrate and Thiocyanate

et al. 2019

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Selective transport of trivalent rare earth metals from aqueous into organic environments with the help of amphiphilic "extractants" is an industrially important process. When the amphiphilic extractant is positively charged or neutral, the co-extracted background anions are not only necessary for the charge balance but also have a large impact on the extraction efficiency and selectivity. Particularly, the opposite selectivity trends observed throughout the lanthanides series in the presence of nitrate and thiocyanate ions have not been explained. To understand the role of background anions in the phase transfer of lanthanide cations, we use a positively-charged longchain aliphatic molecule, modeling a common extractant, and gain molecular level insight into interfacial headgroup-anion interactions. By combining surface sensitive sum frequency generation spectroscopy with x-ray reflectivity and grazing incidence x-ray diffraction, we observed qualitative differences in the orientational and overall interfacial structure of nitrate and thiocyanate solutions at a positively charged Langmuir monolayer. Though nitrate adsorbs without dramatic changes to the solvation structure at the interface or the monolayer ordering, thiocyanate significantly alters water structure and reduces monolayer ordering. We suggest that these qualitatively different adsorption trends help explain a reversal in system selectivity towards lighter or heavier lanthanides in solvent extraction systems in the presence of nitrate or thiocyanate anions.The effect of ions at interfaces has been of interest since Franz Hofmeister observed the differential abilities of ions to precipitate proteins. 1-3 The implications of the Hofmeister series extends well beyond biological systems; specific ion effects (SIE) are important in a wide range of fields, including geochemistry, 4-5 atmospheric chemistry, 6-8 and chemical separations, [9][10][11][12][13] where ion adsorption and/or transfer at aqueous interfaces play significant roles. Due to this broad applicability, the Hofmeister series and similar empirical trends in SIE have been extensively studied to understand the effects of ions that cannot be simply explained by their charge and ionic concentration. [3][4][5][14][15][16][17] The majority of these studies use the concept of "series" to explain certain physicochemical effects of ions being "more" or "less" for one ion compared to another one.Although useful in many cases, this language inevitably implies a possible single underlying mechanism to explain SIE. However, with the advancement of molecular-scale probes that can directly observe SIE at interfaces, it has become evident that such simple and universal explanation, possibly, does not exist. [2][3][18][19] Instead, SIE needs to be considered in a multidimensional parameter space, considering all the possible factors, such as surface functionalization and hydrophobicity, and ion-ion and ion-solvent correlations that are enhanced at interfaces and in confinement. 3,7

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“…The IFT steady-state values between system (a) and crude oil are less than 0.05 mN/m in the investigated surfactant concentration range. Notably, we can also see a distinct phenomenon that the IFT value for LDEA concentration at 0.3% first decreases and then increases to a steady state, which may be due to a mass transfer across the interface [19]. Nevertheless, the IFT values of system (b)/ crude oil are only less than 0.05 mN/m at a concentration of 0.2-0.3 wt%.…”

Section: Structural Characterizationmentioning

confidence: 81%

Effect of Thermal Stability of Alkanolamide on Oil/Water Interfacial Tensions

Guo

Feng

et al. 2017

J Surfact & Detergents

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In order to investigate the effect of thermal stability of alkanolamide on oil/water interfacial tensions (IFT), lauric diethanolamide (LDEA) was synthesized. The effects of temperature and standing time on the composition and oil/water IFT was studied in detail. The results showed that the changes in composition and oil/water IFT at the same conditions were essentially in agreement. The best standing temperature range was from 30 to 60 °C with a standing time of more than 10 days. The inherent cause of thermal stability on oil/water IFT was revealed through structure characterization and composition analysis with FTIR spectrometry and GC–MS spectrometry. It was found that the composition's change of mixed LDEA systems disturbed the hydrophilic‐lipophilic balance, which influenced the ability to reduce the interfacial tension.

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Kinetics of Triton-X100 Transfer Across the Water/Dodecane Interface: Analysis of the Interfacial Tension Variation

Cited by 26 publications

References 44 publications

Coassembly Kinetics of Graphene Oxide and Block Copolymers at the Water/Oil Interface

Coassembly Kinetics of Graphene Oxide and Block Copolymers at the Water/Oil Interface

The Role of Specific Ion Effects in Ion Transport: The Case of Nitrate and Thiocyanate

Effect of Thermal Stability of Alkanolamide on Oil/Water Interfacial Tensions

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