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doi:10.14294/water.2009.2

Cited by 18 publications

(25 citation statements)

References 104 publications

(148 reference statements)

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“…It is commonly argued that it is too implausible for this effect to arise from the presence of contaminants due to the reproducibility of the result. [89,11,101] Indeed, it would be surprising if contaminants are the explanation, but similarly such a large hydroxide adsorption would be equally surprising given the above arguments. In addition, hydrophobic interfaces with no zeta potential have been observed.…”

Section: Hydroxide Adsorptionmentioning

confidence: 98%

“…A common explanation is to assert that this adsorption force only acts at very low salt concentration. This argument has been made [2,89] in response to evidence from molecular dynamics simulation that hydroxide is repelled from the air-water interface, because these simulations must necessarily be performed at high-concentration due to system size limitations. In contrast the calculations we have performed here are valid at the infinite dilution limit, so this criticism does not apply.…”

Section: Hydroxide Adsorptionmentioning

confidence: 99%

“…[105,106,107] Other potential explanations may be charge transfer effects, [73] or dynamic effects combined with an enhancement of autolysis at the interface. [89] …”

Section: Hydroxide Adsorptionmentioning

confidence: 99%

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Hydronium and hydroxide at the air–water interface with a continuum solvent model

Duignan

Parsons

Ninham

2015

Chemical Physics Letters

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The distribution of hydronium and hydroxide ions at the air-water interface has been a problem of much interest in recent years. Here we explore what insights can be gained from a continuum solvent model. We extend our model of ionic solvation free energies and surface interaction free energies to include hydronium and hydroxide. The hydronium cation is attracted to the air-water interface, whereas the hydroxide anion is repelled. If the cavity size parameters required by the model are adjusted to reproduce solvation energies, quantitative agreement with experimental surface tensions is achieved. To the best of our knowledge, this is the most accurate theoretical prediction of this property so far. The results indicate that even if 'water structure' is important, its effects can be captured with a relatively simple model. They also contradict the inference from electrophoresis that there is strong hydroxide enhancement at the air-water interface.

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Section: Hydroxide Adsorptionmentioning

confidence: 98%

Section: Hydroxide Adsorptionmentioning

confidence: 99%

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Hydronium and hydroxide at the air–water interface with a continuum solvent model

Duignan

Parsons

Ninham

2015

Chemical Physics Letters

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“…Since single ion hydration free energies are not measurable in a condensed phase experiment, proper execution of such a fit requires the use of a number of correction terms. Even the sign of some of the correction terms is being debated. , …”

Section: Introductionmentioning

confidence: 99%

Accurate Prediction of the Hydration Free Energies of 20 Salts through Adaptive Force Matching and the Proper Comparison with Experimental References

Wang

2017

J. Phys. Chem. B

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Simple pairwise potentials for five alkali ions and four halide ions were developed by only fitting to ab initio MP2 forces with the adaptive force matching (AFM) method. Without fitting to any experimental information, the AFM models predict the hydration free energies of all 10 fluoride and chloride salts formed by these ions within 1.5% of experimental references. The predicted hydration free energies for the 10 bromide and iodide salts are within 5–6% of experimental references with the larger error likely due to the neglect of explicit treatment of polarization and charge transfer. An inconsistency in the treatment of the gas phase entropy term between experimental and theoretical approaches is discussed. A new simplified hydration free energy for the ions is reported for use as a more appropriate experimental reference for further theoretical studies. The simulations show different dipole alignments for the hydration waters of cations and anions. While hydration waters of small cations tend to align their molecular dipole toward the ion, the dipole of one of the water OH bonds is aligned with the field of an anion.

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“…8. The negative potential was caused by HCO 3 − generated from the carbon dioxide dissolved in water (Chaplin, 2009). Accordingly, a high absolute value of zeta potential was attributed to the water content.…”

Section: Particle Sizing and Zeta (ζ) Potentialmentioning

confidence: 99%

Preparation of Water‐in‐Oil Microemulsion from the Mixtures of Castor Oil and Sunflower Oil as Makeup Remover

Pakkang

Uraki

Koda

et al. 2018

J Surfact & Detergents

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Cosmetics accumulated in facial skin are difficult to remove by ordinary cleansers because they normally contain highly waterproof ingredients. Therefore, development of makeup remover products is necessary for the efficient removal of cosmetics without irritation to the skin. Current commercial makeup removers are emulsions produced from mineral oil and water with surfactants sometimes cause allergies and acne. To overcome these problems, vegetable oils seem to be promising ingredients for makeup removers. In this study, such makeup removers were prepared as water‐in‐oil (w/o) microemulsion from a mixture of castor oil and sunflower oil at ratios from 1:9 to 5:5 and water with nonionic surfactants, Span®80 and Dehydol LS®TH. The remover candidates were selected with respect to transparency of emulsion and cleansing efficiency. As a result, an emulsion was prepared from a mixture of castor oil and sunflower oil with the ratio of 3:7, Dehydol LS®TH with 7 repeating units of ethylene oxide, and 7.0% (w/w) of water. It was found that the stability of transparency and a high cleansing efficiency were attributed to the hydrophilicity of the surfactant and castor oil. Dynamic light‐scattering analysis demonstrated that the emulsion consisted of nanoscale micelles, resulting in a microemulsion.

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Untitled

Cited by 18 publications

References 104 publications

Hydronium and hydroxide at the air–water interface with a continuum solvent model

Hydronium and hydroxide at the air–water interface with a continuum solvent model

Accurate Prediction of the Hydration Free Energies of 20 Salts through Adaptive Force Matching and the Proper Comparison with Experimental References

Preparation of Water‐in‐Oil Microemulsion from the Mixtures of Castor Oil and Sunflower Oil as Makeup Remover

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