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Title: Surface Polarization Effects on Ion-Containing Emulsions

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Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 119; Journal Issue: 13; Related Information: CHORUS Timestamp: 2017-09-28 10:32:08; Journal ID: ISSN 0031-9007
American Physical Society
Country of Publication:
United States

Citation Formats

Shen, Meng, Li, Honghao, and Olvera de la Cruz, Monica. Surface Polarization Effects on Ion-Containing Emulsions. United States: N. p., 2017. Web. doi:10.1103/PhysRevLett.119.138002.
Shen, Meng, Li, Honghao, & Olvera de la Cruz, Monica. Surface Polarization Effects on Ion-Containing Emulsions. United States. doi:10.1103/PhysRevLett.119.138002.
Shen, Meng, Li, Honghao, and Olvera de la Cruz, Monica. 2017. "Surface Polarization Effects on Ion-Containing Emulsions". United States. doi:10.1103/PhysRevLett.119.138002.
title = {Surface Polarization Effects on Ion-Containing Emulsions},
author = {Shen, Meng and Li, Honghao and Olvera de la Cruz, Monica},
abstractNote = {},
doi = {10.1103/PhysRevLett.119.138002},
journal = {Physical Review Letters},
number = 13,
volume = 119,
place = {United States},
year = 2017,
month = 9

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on September 28, 2018
Publisher's Accepted Manuscript

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  • This article examines the effects of various emulsifiers on the electrical conductivity (EC) of emulsions of water in crude oil under conditions approaching the conditions prevailing in crude oil demulsification in electrocoalescing vessels. It is assumed that the EC of inverse hydrocarbon emulsions depends on the strength of the electric field. Beginning at a field strength of some hundreds of V/cm, the character of this relationship is determined mainly by the formation of conducting chains of water drops, which greatly increase the emulsion EC. It is determined that from the values of the EC measured in a low-strength field, itmore » is impossible to judge the mechanism of electrical conduction of an emulsion in high-strength fields that are characteristic for the electrocoalescence process. Measurements were conducted at intermediate field strengths with average values E /SUB av/ of 2 and 6kV/cm, with a 50-Hz ac field, an emulsion flow velocity of 5.1 cm/sec, and an aqueous disperse phase content of 4%, using a coaxial cylindrical cell. The results from the measurements show that the presence of a demulsifier in the W/O emulsion affects its EC, with this effect depending to different degrees on the type of demulsifier, the concentration of demulsifier, and the field strength. It is established that the EC drops off with increasing demulsifier concentration in the emulsion.« less
  • The influence of lipolytic mechanisms on the transfer of phospholipids and unesterified cholesterol from artificial emulsions, serving as chylomicron models to other plasma lipoproteins, mainly high density lipoproteins (HDL) were tested in vivo. The emulsions labeled with radioactive lipids were injected into the bloodstream of rats (controls) and the results were compared with those obtained from rats that had previously been treated with Triton WR 1339 or heparin. Plasma clearance and the distribution of cholesteryl esters, phospholipids and unesterified cholesterol in the different plasma lipoprotein fractions were then determined. Whereas virtually no cholesteryl esters were found in d greater thanmore » 1.006 g/mL density fraction of the three experimental groups, 2.8 +/- 1.3% of the injected phospholipids were in the 1.063-1.210 g/L density fraction of the Triton treated rats, and 12.6 +/- 5.4% of the heparin treated rats, as compared to 10.1 +/- 1.7% in controls. This indicates that lipolysis directly influences phospholipid transfer to HDL. In contrast, free-cholesterol transfer to HDL, besides being less pronounced than phospholipid transfer, was enhanced by Triton and diminished by heparin, indicating that lipolytic mechanisms were not important determinants in this process.« less
  • Orientation of a nematic liquid crystal, E-7, was investigated using coumarin-containing polymethacrylates to elucidate the roles played by the dilution of coumarin and the polarization ratio of irradiation. Dilution of coumarin by inert moieties had adverse effects on a nematic cell’s number density of disclinations and its orientational order parameter in the parallel but not the perpendicular regime. In addition, both dilution of coumarin and a decreasing polarization ratio resulted in a lower extent of coumarin dimerization at crossover, Xc. The significantly reduced Xc in a homopolymer comprising triphenylamine and coumarin was attributed to the dilution of coumarin and themore » diminished polarization ratio caused by competing absorption with simultaneous triplet energy transfer from triphenylamine to coumarin moieties.« less