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Title: Dielectric Properties of Organic Solvents in an Electric Field

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Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Molecularly Engineered Energy Materials (MEEM)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
DOE Contract Number:
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Physical Chemistry. C; Journal Volume: 121; Journal Issue: 2; Related Information: MEEM partners with University of California, Los Angeles (lead); University of California, Berkeley; Eastern Washington University; University of Kansas; National Renewable Energy Laboratory
Country of Publication:
United States

Citation Formats

Daniels, Isaak N., Wang, Zhenxing, and Laird, Brian B.. Dielectric Properties of Organic Solvents in an Electric Field. United States: N. p., 2017. Web. doi:10.1021/acs.jpcc.6b10896.
Daniels, Isaak N., Wang, Zhenxing, & Laird, Brian B.. Dielectric Properties of Organic Solvents in an Electric Field. United States. doi:10.1021/acs.jpcc.6b10896.
Daniels, Isaak N., Wang, Zhenxing, and Laird, Brian B.. Thu . "Dielectric Properties of Organic Solvents in an Electric Field". United States. doi:10.1021/acs.jpcc.6b10896.
title = {Dielectric Properties of Organic Solvents in an Electric Field},
author = {Daniels, Isaak N. and Wang, Zhenxing and Laird, Brian B.},
abstractNote = {},
doi = {10.1021/acs.jpcc.6b10896},
journal = {Journal of Physical Chemistry. C},
number = 2,
volume = 121,
place = {United States},
year = {Thu Jan 19 00:00:00 EST 2017},
month = {Thu Jan 19 00:00:00 EST 2017}
  • We report on the observation of reversible and immediate resistance switching by high-k oxide Ta{sub 2}O{sub 5}/organic parylene-C hybrid dielectric-gated VO{sub 2} thin films. Resistance change ratios at various temperatures in the insulating regime were demonstrated to occur in the vicinity of phase transition temperature. We also found an asymmetric hole-electron carrier modulation related to the suppression of phase transition temperature. The results in this research provide a possibility for clarifying the origin of metal-insulator transition in VO{sub 2} through the electrostatic field-induced transport modulation.
  • When it is assumed that organic solvents do not interfere with the binding process nor with the catalytic mechanism, the contribution of substrate-solvent interactions to enzyme kinetics can be accounted for by just replacing substrate concentrations in the equations by thermodynamic activities. It appears from the transformation that only the affinity parameters (K{sub m},k{sub sp}) are affected by this. Thus, in theory, the values of these corrected, intrinsic parameters (K{sub m}{sup int}, k{sub sp}{sup int}) and the maximal rate (V{sub 1}) should be equal for all media. This was tested for hydrolysis, transesterification, and esterification reactions catalyzed by pig pancreasmore » lipase and Pseudomonas cepacia lipase in various organic solvents. Correction was carried out via experimentally determined activity coefficients for the substrates in these solvents or, if not feasible, from values in data bases. However, although the kinetic performances of each enzyme in the solvents became much more similar after correction, differences still remained. Analysis of the enzyme suspensions revealed massive particles, which explains the low activity of enzymes in organic solvents. However, no correlation was found between estimates of the amount of catalytically available enzyme (present at the surface of suspended particles or immobilized on beads) and the maximal rates observed. Moreover, the solvents had similar effects on the intrinsic parameters of suspended and immobilized enzyme. The possible causes for the effects of the solvents on the catalytic performance of the enzymes, remaining after correction for solvent-substrate interactions and the amount of participating enzyme, are discussed with respect to the premises on which the correction method is based.« less
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