Distribution of phase transfer biocatalyst at the oil/water interface by membrane emulsifier and evaluation of enantiocatalytic performance

Desalination ◽  
2006 ◽  
Vol 199 (1-3) ◽  
pp. 182-184
Author(s):  
Lidietta Giorno ◽  
Emma Piacentini ◽  
Rosalinda Mazzei ◽  
Enrico Drioli
Keyword(s):  
Phase Transfer ◽  
Water Interface ◽  
Oil Water

Microemulsion Mediated Organic Synthesis and the Possible Reaction Site

2016 ◽  
Vol 32 (1-2) ◽  
pp. 7 ◽  
Author(s):  
Prasanjit Ghosh ◽  
Barnali Kar ◽  
Soumik Bardhan ◽  
Kaushik Kundu ◽  
Swapan Kumar Saha ◽  
...  
Keyword(s):  
Organic Synthesis ◽  
Phase Transfer ◽  
Heterogeneous Systems ◽  
Short Review ◽  
Water Soluble ◽  
Organic Reactions ◽  
Polar Component ◽  
Water Interface ◽  
Oil Water ◽  
Reaction Media

Microemulsions (mEs), being thermodynamically stable, single phasic transparent mixtures of oil, water, surfactant ( either individually or in mixed state) and/or co-surfactant, are exemplary and multi dimensional reaction media in organic synthesis. They can act as an alternative of the phase transfer catalysis and influence the rate of the reaction due to the presence of charged carriers (amphiphiles) at the oil/water interface. The regioselectivity of many organic reactions can also be induced by employing mEs as templates. In particular, organic molecules with different degrees of polarity tend to accumulate at the oil/water interface of mEs. Subsequently, they orient themselves at the interface in such a way that the polar component extends into the water domain and the nonpolar component protrudes towards hydrocarbon domain. In view of this, a water-soluble reagent attacks the polar part of the amphiphile, and a reagent soluble in hydrocarbon reacts at the nonpolar part of the amphiphile. Because of this unique feature, use of mEs (or micro heterogeneous systems) as templates for studying organic reactions, have increased manifolds. In this short review, we mainly exemplify (i) mEs as reaction media, (ii) effect of microstructure of mEs on organic transformations and (iii) the most possible reaction location/site in mEs.

Structural properties of polymer-brush-grafted gold nanoparticles at the oil–water interface: insights from coarse-grained simulations

Soft Matter ◽  
2016 ◽  
Vol 12 (14) ◽  
pp. 3352-3359 ◽  
Author(s):  
Xuebo Quan ◽  
ChunWang Peng ◽  
Jiaqi Dong ◽  
Jian Zhou
Keyword(s):  
Gold Nanoparticles ◽  
Structural Properties ◽  
Phase Transfer ◽  
Polymer Brush ◽  
Coarse Grained ◽  
Water Interface ◽  
Oil Water ◽  
Coarse Grained Simulations

Phase transfer of polymer brush-grafted gold nanoparticles across the oil–water interface.

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.

Metal–Phenolic Network Covering on Zein Nanoparticles as a Regulator on the Oil/Water Interface

2020 ◽  
Vol 68 (31) ◽  
pp. 8471-8482
Author(s):  
Di Wu ◽  
Yalei Dai ◽  
Yunan Huang ◽  
Jin Gao ◽  
Hongshan Liang ◽  
...  
Keyword(s):  
Water Interface ◽  
Oil Water
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