Interactions of hydrophilic silica nanoparticles and classical surfactants at non-polar oil–water interface

Previous studies of the effect of monolayers on the electrical potential difference across polar oil/water interfaces have produced only conflicting data about the existence, magnitude and stability of the so-called adsorption or surface potentials (∆ V ). It is now shown that, with carefully defined experiments, remarkably stable values for ∆ V can often be obtained whose rates of decay are so slow that ∆ V -surface density isotherms similar to those established for air/water or non-polar oil/water interfaces can be obtained. The rapid decays found previously are attributed to inadequate electrical or surface chemical controls.

Download Full-text

Interfacial rheology of novel functional silica nanoparticles adsorbed layers at oil-water interface and correlation with Pickering emulsion stability

Journal of Molecular Liquids ◽

10.1016/j.molliq.2019.111500 ◽

2019 ◽

Vol 293 ◽

pp. 111500 ◽

Cited By ~ 5

Author(s):

Hongda Zhou ◽

Caili Dai ◽

Qingsheng Zhang ◽

Yuyang Li ◽

Wenjiao Lv ◽

...

Keyword(s):

Silica Nanoparticles ◽

Emulsion Stability ◽

Pickering Emulsion ◽

Interfacial Rheology ◽

Water Interface ◽

Adsorbed Layers ◽

Oil Water

Download Full-text

Silica nanoparticles catalyse the formation of silica nanocapsules in a surfactant-free emulsion system

Journal of Materials Chemistry A ◽

10.1039/c5ta06947e ◽

2015 ◽

Vol 3 (48) ◽

pp. 24428-24436 ◽

Cited By ~ 14

Author(s):

Yongliang Zhao ◽

Zhi Chen ◽

Xiaomin Zhu ◽

Martin Möller

Keyword(s):

Silica Nanoparticles ◽

Water Interface ◽

Emulsion System ◽

System P ◽

Silica Capsule ◽

Oil Water ◽

Silica Nanocapsules

Interplay between methylated silica nanoparticles and polyethoxysiloxane at oil/water interface leads to a variety of silica capsule structures.

Download Full-text

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

10.1021/scimeetings.0c07366 ◽

2020 ◽

Author(s):

Bingqing qian ◽

Haiqiao Wang ◽

Dong Wang ◽

Hao-Bin Zhang ◽

Jessica Wu ◽

...

Keyword(s):

Porous Materials ◽

Cellulose Nanocrystal ◽

Water Interface ◽

Oil Water

Download Full-text

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

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19910112 ◽

1991 ◽

Vol 56 (1) ◽

pp. 112-129 ◽

Cited By ~ 14

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.

Download Full-text