Interfacially Controlled Transport of Micelle-Solubilized Sterols across an Oil/ Water Interface in Two Ionic Surfactant Systems

1972 ◽  
Vol 61 (3) ◽  
pp. 375-379 ◽  
Author(s):  
Vijay Surpuriya ◽  
W.I. Higuchi
Keyword(s):  
Ionic Surfactant ◽  
Water Interface ◽  
Oil Water ◽  
Surfactant Systems

Molecular dynamics study of nanoparticles and non-ionic surfactant at an oil–water interface

Soft Matter ◽  
2011 ◽  
Vol 7 (15) ◽  
pp. 6942 ◽  
Author(s):  
R. J. K. Udayana Ranatunga ◽  
Chuong T. Nguyen ◽  
Blake A. Wilson ◽  
Wataru Shinoda ◽  
Steven O. Nielsen
Keyword(s):  
Molecular Dynamics ◽  
Ionic Surfactant ◽  
Water Interface ◽  
Oil Water

scholarly journals Stabilisation of Emulsified Agarwood Oil in an Aqueous System Using Non-Ionic Surfactant

2019 ◽  
Vol 797 ◽  
pp. 186-195
Author(s):  
Boon Yih Tien ◽  
Mohd Nazli Naim ◽  
Rabitah Zakaria ◽  
Noor Fitrah Abu Bakar ◽  
Noraini Ahmad ◽  
...  
Keyword(s):  
Zeta Potential ◽  
Droplet Size ◽  
Ostwald Ripening ◽  
Alkaline Condition ◽  
Ionic Surfactant ◽  
Water Interface ◽  
Oil Droplets ◽  
Emulsified Oil ◽  
Oil Water ◽  
Agarwood Oil

Owing to the annually increasing market value of pure agarwood oil, the extracted agarwood oil from Aquilaria malaccensis was emulsified in an aqueous solution using non-ionic surfactant (Tween 80). The surfactant concentration of 0.0167% was determined as the critical micelle concentration (CMC) with an interfacial tension value of 0.014 mNm-1. The adsorption of surfactant at the oil/water interface at the CMC value, however, reduced the zeta potential of the emulsified oil from –45 to –43 mV, and increased its size from 85 to 89 nm. Outside of the CMC value, the emulsified oil droplets tended to coalesce, owing to insufficient coverage of the surfactant at oil/water interface and Ostwald ripening. The droplet size distribution and zeta potential value of the emulsified oil droplets produced at the CMC were the most stable over a month of storage. No significant changes in the emulsified droplet size occurred when the pH conditions varied from pH 3 to 10. The emulsified droplets images obtained from transmission electron microscopy analysis showed a reduction in the layer thickness of the surfactant from 30 to 10 nm in acidic condition and 30 to 19 nm in alkaline condition. The agarwood oil emulsification at CMC value enhance the stability of chemically unstable compounds from degradation.

Porous materials from cellulose nanocrystal and mxene surfactants at the oil/water interface

2020 ◽  
Author(s):  
Bingqing qian ◽  
Haiqiao Wang ◽  
Dong Wang ◽  
Hao-Bin Zhang ◽  
Jessica Wu ◽  
...  
Keyword(s):  
Porous Materials ◽  
Cellulose Nanocrystal ◽  
Water Interface ◽  
Oil Water

Polarizability and nonpolarizability of oil-water interfaces with relevance to a.c. impendance measurements

1991 ◽  
Vol 56 (1) ◽  
pp. 112-129 ◽  
Author(s):  
Takashi Kakiuchi ◽  
Mitsugi Senda
Keyword(s):  
Charge Transfer ◽  
Numerical Calculation ◽  
Supporting Electrolyte ◽  
Water Interface ◽  
Migration Effect ◽  
Ac Current ◽  
Stationary Interface ◽  
Oil Water ◽  
Anion Transfer

We have estimated the degree of polarizability of a polarized oil-water interface used as a working interface and that of the nonpolarizability of a nonpolarized interface used as a reference oil-water interface from the numerical calculation of dc and ac current vs potential behavior at both interfaces. Theoretical equations of dc and ac currents for simultaneous cation and anion transfer of supporting electrolytes have been derived for the planar stationary interface for reversible and quasi-reversible cases. In the derivation, the migration effect and the coupling of the cation and anion transfer have been incorporated. The transfer of ions constituting a supporting electrolyte contributes to the total admittance of the interface even in the region where the interface may be considered as polarized in dc sense, as pointed out first by Samec et al. (J. Electroanal. Chem. 126, 121 (1981)). Moreover, the reference oil-water interface is not ideally reversible, so that the contribution from this interface to the measured admittance cannot be negligible, unless the area of the reference oil-water interface is much larger than that of the working oil-water interface. The effect of non-ideality of the reference oil-water interface on the determination of double layer capacitances and kinetic parameters of charge transfer at the working oil-water interface has been estimated.

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