Dihedral Angle of Lens and Interfacial Tension of Air/Long Chain Alcohol/Water Systems. 2

Aratono, Makoto; Toyomasu, Takayuki; SHINODA, Takeo; Ikeda, Norihiro; Takiue, Takanori

doi:10.1021/la9804233

Cited by 9 publications

(20 citation statements)

References 30 publications

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“…[12] to [14] are independent of the position of the two dividing surfaces. Let us call this choice of dividing surfaces the H convention.…”

Section: Thermodynamic Equations As a Function Of Temperature Pressumentioning

confidence: 96%

“…Then the interfacial tension is given as a function of the independent variable in the H convention by [19] where the quantities with the superscript H are, respectively, defined from Eqs. [12] to [14] as…”

Section: Thermodynamic Equations As a Function Of Temperature Pressumentioning

confidence: 99%

“…In our previous papers, the new apparatus and procedure for dihedral angle measurements have been shown to be very successful (11), and the state and phase transition of the interfacial films, the wetting behavior, the intruding phenomena, and the mutual relation among them have been discussed thoroughly with respect to the air/long-chain alcohol/water systems with a floating alcohol lens (12). In the thermodynamic analysis of the experimental interfacial tension data, however, only the resulting equations have been used without description of the detail formulation and convention employed.…”

Section: Introductionmentioning

confidence: 99%

“…In the course of this, we employ the H convention and introduce newly the P convention in order to define the surface excess thermodynamic quantities unequivocally and then claim that the P convention brings in a kind of thickness of a reference lens phase in the interfacial region. Second, the equations are simplified so as to be applicable to the experimental systems such as the air/long-chain alcohol/ water with an alcohol lens (12), the air/oil solution of oilsoluble long-chain alcohol/water with an oil solution lens (20), and air/oil/aqueous solution of a surfactant with an oil lens (21), where the effect of curvatures of the interfaces seems to be not so influential for a lens in our usual experiments.…”

Section: Introductionmentioning

confidence: 99%

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Thermodynamics of Formation of and Adsorption at Interfaces with a Floating Lens

Aratono

Toyomasu

Ikeda

et al. 1999

Journal of Colloid and Interface Science

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“…[12] to [14] are independent of the position of the two dividing surfaces. Let us call this choice of dividing surfaces the H convention.…”

Section: Thermodynamic Equations As a Function Of Temperature Pressumentioning

confidence: 96%

Section: Thermodynamic Equations As a Function Of Temperature Pressumentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Thermodynamics of Formation of and Adsorption at Interfaces with a Floating Lens

Aratono

Toyomasu

Ikeda

et al. 1999

Journal of Colloid and Interface Science

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“…[37,38] The interfacial tension was calculated from the equation , and H are the density difference between the a and b phases, the acceleration due to gravity, the maximum diameter of the equatorial plane of the drop, and the correction factor, respectively. [39] For further details, see ref.…”

Section: à5mentioning

confidence: 99%

Wetting of Surfactant Solutions by Alkanes

et al. 2005

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Ellipsometry, surface tensiometry, and contact-angle measurement have been used to study the transition between partial wetting and pseudo-partial wetting of surfactant solutions by alkanes. In the partial wetting regime, the air-water surface tension is the same with and without alkane. In the pseudo-partial wetting regime, the air-water surface tension is lowered by the presence of alkane, showing that oil is solubilised into the surfactant monolayer. A discontinuous change in the coefficient of ellipticity with increasing surfactant concentration provides unequivocal evidence for the first-order nature of the wetting transitions. Ellipsometry has been used to explore the generality of wetting transitions of alkanes (dodecane, hexadecane, and squalane) on surfactant solutions [dodecyltrimethylammonium bromide, tetredecyltrimethylammonium bromide, dibucaine hydrochloride, and Aerosol OT (AOT)]. Of the systems studied, only hexadecane on AOT solutions did not show a wetting transition. Excess alkane remains as a lens on the surface of the surfactant solutions at all concentrations, but the contact angle is a minimum at the wetting transition. A semiquantitative model for the variation of the contact angle with surfactant concentration is provided.

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Integrated organic–aqueous biocatalysis and product recovery for quinaldine hydroxylation catalyzed by living recombinant Pseudomonas putida

Ütkür

Tran

Collins

et al. 2012

Journal of Industrial Microbiology and Biotechnology

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In an earlier study, biocatalytic carbon oxyfunctionalization with water serving as oxygen donor, e.g., the bioconversion of quinaldine to 4-hydroxyquinaldine, was successfully achieved using resting cells of recombinant Pseudomonas putida, containing the molybdenum-enzyme quinaldine 4-oxidase, in a two-liquid phase (2LP) system (Ütkür et al. J Ind Microbiol Biotechnol 38:1067-1077, 2011). In the study reported here, key parameters determining process performance were investigated and an efficient and easy method for product recovery was established. The performance of the whole-cell biocatalyst was shown not to be limited by the availability of the inducer benzoate (also serving as growth substrate) during the growth of recombinant P. putida cells. Furthermore, catalyst performance during 2LP biotransformations was not limited by the availability of glucose, the energy source to maintain metabolic activity in resting cells, and molecular oxygen, a possible final electron acceptor during quinaldine oxidation. The product and the organic solvent (1-dodecanol) were identified as the most critical factors affecting biocatalyst performance, to a large extent on the enzyme level (inhibition), whereas substrate effects were negligible. However, none of the 13 alternative solvents tested surpassed 1-dodecanol in terms of toxicity, substrate/product solubility, and partitioning. The use of supercritical carbon dioxide for phase separation and an easy and efficient liquid-liquid extraction step enabled 4-hydroxyquinaldine to be isolated at a purity of >99.9% with recoveries of 57 and 84%, respectively. This study constitutes the first proof of concept on an integrated process for the oxyfunctionalization of toxic substrates with a water-incorporating hydroxylase.

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Dihedral Angle of Lens and Interfacial Tension of Air/Long Chain Alcohol/Water Systems. 2

Cited by 9 publications

References 30 publications

Thermodynamics of Formation of and Adsorption at Interfaces with a Floating Lens

Thermodynamics of Formation of and Adsorption at Interfaces with a Floating Lens

Wetting of Surfactant Solutions by Alkanes

Integrated organic–aqueous biocatalysis and product recovery for quinaldine hydroxylation catalyzed by living recombinant Pseudomonas putida

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