Universal Temperature Crossover Behavior of Electrical Conductance in a Single Oligothiophene Molecular Wire

ACS Nano ◽  
2012 ◽  
Vol 6 (6) ◽  
pp. 5078-5082 ◽  
Author(s):  
See Kei Lee ◽  
Ryo Yamada ◽  
Shoji Tanaka ◽  
Gap Soo Chang ◽  
Yoshihiro Asai ◽  
...  
Keyword(s):  
Electrical Conductance ◽  
Molecular Wire ◽  
Crossover Behavior

scholarly journals Ab initio electrical conductance of a molecular wire

2002 ◽  
Vol 91 (3) ◽  
pp. 524-532 ◽  
Author(s):  
Roi Baer ◽  
Daniel Neuhauser
Keyword(s):  
Ab Initio ◽  
Electrical Conductance ◽  
Molecular Wire

New Molecular Scaffolds for Fluorescent Voltage Indicators

2018 ◽  
Author(s):  
Steven Boggess ◽  
Shivaani Gandhi ◽  
Brian Siemons ◽  
Nathaniel Huebsch ◽  
Kevin Healy ◽  
...  
Keyword(s):  
Membrane Potential ◽  
Action Potentials ◽  
Induced Pluripotent Stem Cell ◽  
Molecular Wire ◽  
Voltage Sensing ◽  
Design Synthesis ◽  
Cardiac Action ◽  
Action Potential Waveform ◽  
Induced Pluripotent ◽  
Voltage Sensing Domain

<div> <p>The ability to non-invasively monitor membrane potential dynamics in excitable cells like neurons and cardiomyocytes promises to revolutionize our understanding of the physiology and pathology of the brain and heart. Here, we report the design, synthesis, and application of a new class of fluorescent voltage indicator that makes use of a fluorene-based molecular wire as a voltage sensing domain to provide fast and sensitive measurements of membrane potential in both mammalian neurons and human-derived cardiomyocytes. We show that the best of the new probes, fluorene VoltageFluor 2 (fVF 2) readily reports on action potentials in mammalian neurons, detects perturbations to cardiac action potential waveform in human induced pluripotent stem cell (hiPSC)-derived cardiomyocytes, shows a substantial decrease in phototoxicity compared to existing molecular wire-based indicators, and can monitor cardiac action potentials for extended periods of time. Together, our results demonstrate the generalizability of a molecular wire approach to voltage sensing and highlights the utility of fVF 2 for interrogating membrane potential dynamics.</p> </div>

The Structure of a Biological Insulated Transmembrane Molecular Wire

2019 ◽  
Author(s):  
Marcus Edwards ◽  
Gaye White ◽  
Julea Butt ◽  
David J. Richardson ◽  
Thomas A. Clarke
Keyword(s):  
Molecular Wire

On the nature of the electrical conductance of organic polyethynylpolyarene-base semiconductors

1969 ◽  
Vol 18 (4) ◽  
pp. 856-858
Author(s):  
V. G. Kostrovskii ◽  
E. D. Litman ◽  
T. G. Shishmakova ◽  
I. L. Kotlyarevskii ◽  
M. I. Bardamova
Keyword(s):  
Electrical Conductance

Electrical conductance for the detection of dental caries

2021 ◽  
Author(s):  
Richard Macey ◽  
Tanya Walsh ◽  
Philip Riley ◽  
Anne-Marie Glenny ◽  
Helen V Worthington ◽  
...  
Keyword(s):  
Dental Caries ◽  
Electrical Conductance

scholarly journals Behavior and properties of water in silicate melts under deep mantle conditions

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Bijaya B. Karki ◽  
Dipta B. Ghosh ◽  
Shun-ichiro Karato
Keyword(s):  
Electrical Conductivity ◽  
Molar Volume ◽  
Water Solution ◽  
Pure Water ◽  
Electrical Conductance ◽  
Water Structure ◽  
Bulk Water ◽  
Silicate Melts ◽  
Pressure Regime ◽  
Low Pressures

AbstractWater (H2O) as one of the most abundant fluids present in Earth plays crucial role in the generation and transport of magmas in the interior. Though hydrous silicate melts have been studied extensively, the experimental data are confined to relatively low pressures and the computational results are still rare. Moreover, these studies imply large differences in the way water influences the physical properties of silicate magmas, such as density and electrical conductivity. Here, we investigate the equation of state, speciation, and transport properties of water dissolved in Mg1−xFexSiO3 and Mg2(1−x)Fe2xSiO4 melts (for x = 0 and 0.25) as well as in its bulk (pure) fluid state over the entire mantle pressure regime at 2000–4000 K using first-principles molecular dynamics. The simulation results allow us to constrain the partial molar volume of the water component in melts along with the molar volume of pure water. The predicted volume of silicate melt + water solution is negative at low pressures and becomes almost zero above 15 GPa. Consequently, the hydrous component tends to lower the melt density to similar extent over much of the mantle pressure regime irrespective of composition. Our results also show that hydrogen diffuses fast in silicate melts and enhances the melt electrical conductivity in a way that differs from electrical conduction in the bulk water. The speciation of the water component varies considerably from the bulk water structure as well. Water is dissolved in melts mostly as hydroxyls at low pressure and as –O–H–O–, –O–H–O–H– and other extended species with increasing pressure. On the other hand, the pure water behaves as a molecular fluid below 15 GPa, gradually becoming a dissociated fluid with further compression. On the basis of modeled density and conductivity results, we suggest that partial melts containing a few percent of water may be gravitationally trapped both above and below the upper mantle-transition region. Moreover, such hydrous melts can give rise to detectable electrical conductance by means of electromagnetic sounding observations.

Electrical Conductance of the LiCl–KCl Eutectic Melt Containing Halides and Alkali Titanium Fluorides as Solutes

1958 ◽  
Vol 62 (12) ◽  
pp. 1479-1482 ◽  
Author(s):  
George J. Janz ◽  
C. T. Brown ◽  
H. J. Gardner ◽  
C. Solomons
Keyword(s):  
Electrical Conductance ◽  
Eutectic Melt
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