Interplay of Interfacial Viscosity, Specific-Ion, and Impurity Adsorption Determines Zeta Potentials of Phospholipid Membranes

AbstractThis work investigates the effect of the surface charges of oil droplets and carbonate rocks in brine and in surfactant solutions on oil production. The influences of the cations in brine and the surfactant types on the zeta-potentials of both oil droplets and carbonate rock particles are studied. It is found that the addition of anionic and cationic surfactants in brine result in both negative or positive zeta-potentials of rock particles and oil droplets respectively, while the zwitterionic surfactant induces a positive charge on rock particles and a negative charge on oil droplets. Micromodels with a CaCO3 nanocrystal layer coated on the flow channels were used in the oil displacement tests. The results show that when the oil-water interfacial tension (IFT) was at 10−1 mN/m, the injection of an anionic surfactant (SDS-R1) solution achieved 21.0% incremental oil recovery, higher than the 12.6% increment by the injection of a zwitterionic surfactant (SB-A2) solution. When the IFT was lowered to 10−3 mM/m, the injection of anionic/non-ionic surfactant SMAN-l1 solution with higher absolute zeta potential value (ζoil + ζrock) of 34 mV has achieved higher incremental oil recovery (39.4%) than the application of an anionic/cationic surfactant SMAC-l1 solution with a lower absolute zeta-potential value of 22 mV (30.6%). This indicates that the same charge of rocks and oil droplets improves the transportation of charged oil/water emulsion in the porous media. This work reveals that the surface charge in surfactant flooding plays an important role in addition to the oil/water interfacial tension reduction and the rock wettability alteration.

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Ultrafast vibrational dynamics of the tyrosine ring mode and its application to enkephalin insertion into phospholipid membranes as probed by two-dimensional infrared spectroscopy

The Journal of Chemical Physics ◽

10.1063/5.0054428 ◽

2021 ◽

Vol 155 (3) ◽

pp. 035102

Author(s):

Ilya Vinogradov ◽

Yuan Feng ◽

S. K. Karthick Kumar ◽

Chenxu Guo ◽

Nina Saki Udagawa ◽

...

Keyword(s):

Infrared Spectroscopy ◽

Phospholipid Membranes ◽

Two Dimensional ◽

Vibrational Dynamics ◽

Ring Mode ◽

Two Dimensional Infrared Spectroscopy

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Cationic specificity of double-layer phospholipid membranes modified with macrocyclic polyethers

Chemistry of Natural Compounds ◽

10.1007/bf00570817 ◽

1979 ◽

Vol 15 (2) ◽

pp. 212-213

Author(s):

U. Z. Mirkhodzhaev ◽

P. B. Usmanov ◽

A. K. Tashmukhamedova

Keyword(s):

Double Layer ◽

Phospholipid Membranes ◽

Macrocyclic Polyethers ◽

Cationic Specificity

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Influence of monometallic and bimetallic phytonanoparticles on physiological status of mezquite

Open Life Sciences ◽

10.1515/biol-2019-0008 ◽

2019 ◽

Vol 14 (1) ◽

pp. 62-68 ◽

Cited By ~ 3

Author(s):

Daniel Gonzalez-Mendoza ◽

Benjamín Valdez-Salas ◽

Erick Bernardo-Mazariegos ◽

Olivia Tzintzun-Camacho ◽

Federico Gutiérrez-Miceli ◽

...

Keyword(s):

Bimetallic Nanoparticles ◽

Positive Impact ◽

Photochemical Efficiency ◽

Localized Surface Plasmon ◽

Physiological Status ◽

Ag Nps ◽

Zeta Potentials ◽

Minimum Particle Size ◽

Ag Particles ◽

The Impact

AbstractThe present study was conducted to evaluate the impact of monometallic and bimetallic nanoparticles (NPs) of copper (Cu) and silver (Ag) from Justicia spicigera on the photochemical efficiency and phenol pattern of Prosopis glandulosa. In this study, the existence of localized surface plasmon resonance absorption associated with the nano-sized nature of Ag, Cu and Cu/Ag particles was confirmed by the presence of a single peak around 487, 585, and 487/580 nm respectively. Zeta potential and electrophoretic mobility were found to be 0.2 mV and 0.02 μmcm/(Vs) for synthesized NPs indicating less stability and thus tendency to agglomerate, and broad distribution of particles. Cu-NPs and Cu/Ag-NPs demonstrate that the dispersed phase is stable and has a minimum particle size at zeta potentials above –30 mV. Changes in phenolic compounds, total chlorophyll, and photochemical efficiency in leaves exposed to Ag, Cu and Cu/Ag phyto-nanoparticles were evaluated up to 72 hours. The results revealed that Ag-NP and Cu-NP from J. spicigera at 100 mg/L showed significant reduction in chlorophyll, epidermal polyphenol content and photochemical efficiency of P. glandulosa. In contrast, the application of bimetallic Cu/Ag-NP from J. spicigera showed a positive impact on physiological parameters of P. glandulosa after 72 h of exposure.

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