scholarly journals Spatial localization of charged molecules by salt ions in oil-confined water microdroplets

2020 ◽  
Vol 6 (41) ◽  
pp. eaba0181 ◽  
Author(s):  
SangMoon Lhee ◽  
Jae Kyoo Lee ◽  
Jooyoun Kang ◽  
Shota Kato ◽  
Sunhee Kim ◽  
...  
Keyword(s):  
Spatial Localization ◽  
Cellular Membrane ◽  
Bulk Water ◽  
Water Interface ◽  
Confined Water ◽  
Local Distribution ◽  
Salt Ions ◽  
Oil Water ◽  
Positively Charged ◽  
Hydrocarbon Oil

Cells contain more than 100 mM salt ions that are typically confined to dimensions of 5 to 10 micrometers by a hydrophobic cellular membrane. We found that in aqueous microdroplets having the same size as cells and that are confined in hydrocarbon oil, negatively charged molecules were distributed rather uniformly over the interior of the microdroplet, whereas positively charged molecules were localized at and near the surface. However, the addition of salt (NaCl) to the microdroplet caused all charged molecules to be localized near the oil-water interface. This salt-induced relocalization required less salt concentration in microdroplets compared to bulk water. Moreover, the localization became more prominent as the size of the microdroplet was reduced. The relocatization also critically depended on the type of oil. Our results imply that salt ions and different hydrophobic interfaces together may govern the local distribution of charged biomolecules in confined intracellular environments.

Supramolecular Nanotube Hosts for Encapsulation of 10-nm-Scale Objects

2006 ◽  
Vol 922 ◽  
Author(s):  
Toshimi Shimizu
Keyword(s):  
Self Assembly ◽  
Solvent Polarity ◽  
Bulk Water ◽  
Confined Water ◽  
Time Resolved ◽  
Capillary Action ◽  
Aqueous Dispersions ◽  
Hydrogen Bond Networks ◽  
Lipid Nanotube ◽  
Positively Charged

AbstractSupramolecular nanotube hosts with precisely controlled inner or outer diameters have been synthesized by self-assembly of cardanol-based glycolipids, glucopyranosylamide lipids, or glucose-based unsymmetrical bolaamphiphiles. Time-resolved fluorescent measurement using 8-anilinonaphtahalene-1-sulfonate (ANS) as a probe revealed that the water confined in a cardanol-based glycolipid nanotube has relatively lower solvent polarity than bulk water, which corresponds to that of 1-propanol. Extensively developed hydrogen bond networks also characterize the confined water in comparison to the case in bulk water. Encapsulation ability of the glucopyranosylamide lipid nanotube, which depends on capillary action, has been examined by filling the lyophilized lipid nanotubes with aqueous dispersions of gold or silver nanocrystals, ferritin, or magnetic crystals. We have also succeeded in filling the unsymmetrical bolaamphiphile nanotube, which possesses positively charged inner surfaces, with negatively charged polymer beads or ferritin without depending on capillary action.

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.

Investigation on hydrate growth at the oil–water interface: In the presence of asphaltene

2021 ◽  
Author(s):  
Guangchun Song ◽  
Yuanxing Ning ◽  
Yuxing Li ◽  
Wuchang Wang
Keyword(s):  
Water Interface ◽  
Oil Water

scholarly journals The hydrophobic surface of colipase influences lipase activity at an oil–water interface

1998 ◽  
Vol 39 (9) ◽  
pp. 1759-1767 ◽  
Author(s):  
Richard A. Cordle ◽  
Mark E. Lowe
Keyword(s):  
Lipase Activity ◽  
Hydrophobic Surface ◽  
Water Interface ◽  
Oil Water

Coalescence Dynamic Response of an Aqueous Droplet at an Oil-Water Interface Under a Steady Electric Field

2021 ◽  
pp. 103628
Author(s):  
Bin Li ◽  
Xiaohui Dou ◽  
Kai Yu ◽  
Yujie Huang ◽  
Wei Zhang ◽  
...  
Keyword(s):  
Electric Field ◽  
Dynamic Response ◽  
Water Interface ◽  
Oil Water ◽  
Aqueous Droplet

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

Nanosheets of copolymerized ionic liquid-based polyelectrolyte complexes regulated at oil-water interface and their emulsification capability

2021 ◽  
Author(s):  
He Zhang ◽  
Jun Bo Zhang ◽  
Qing Bo Meng ◽  
Wei Guo ◽  
Ming Yang ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Water Interface ◽  
Polyelectrolyte Complexes ◽  
Oil Water

Structure and interfacial adsorption behavior of soy hull polysaccharide at the oil/water interface as influenced by pH

2021 ◽  
Vol 116 ◽  
pp. 106638
Author(s):  
Danni Qu ◽  
Shengnan Wang ◽  
Hekai Zhao ◽  
He Liu ◽  
Danshi Zhu ◽  
...  
Keyword(s):  
Adsorption Behavior ◽  
Water Interface ◽  
Soy Hull ◽  
Oil Water ◽  
Interfacial Adsorption
Sign in / Sign up

Export Citation Format

Share Document