Static Dielectric Constants of Pure Liquids and Binary Liquid Mixtures

Wohlfarth, Ch.

doi:10.1007/978-3-662-48168-4

Cited by 71 publications

(67 citation statements)

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“…The dielectric constants for MC, DMF, and acetonitrile are 8.51, 37.65, and 36.69, respectively. [32,33] As it is possible to see, MC has the lowest dielectric constant, and it is 4.3 times lower than the value for acetonitrile. This means the higher diameter of the PLA fibers was caused by the low dielectric constant of MC, which led to low electric flux density.…”

Section: Curcumin-loaded Biodegradable Electrospun Fibersmentioning

confidence: 92%

Curcumin-Loaded Biodegradable Electrospun Fibers: Preparation, Characterization, and Differences in Fiber Morphology

Luz¹,

Silva²,

Hinestroza³

2013

International Journal of Polymer Analysis and Characterization

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This article relates curcumin incorporation into poly(latic acid) and poly(lactic-co-glycolic acid) fibers by electrospinning. The fibers were characterized by field emission scanning electron microscopy and Fourier transform-infrared spectroscopy, performed in attenuated total reflection, and the actual curcumin content was evaluated by electronic absorption spectroscopy. The poly(latic acid)=curcumin fibers were malleable, had rough surface, and an average diameter of 3.6 mm. On the other hand, poly(lactic-co-glycolic acid)=curcumin fibers were rigid and porous and had an average diameter of 123.6 nm. The bigger diameter of the poly(latic acid) fibers was responsible for a higher percentage of curcumin=milligram of fiber.

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Section: Curcumin-loaded Biodegradable Electrospun Fibersmentioning

confidence: 92%

Curcumin-Loaded Biodegradable Electrospun Fibers: Preparation, Characterization, and Differences in Fiber Morphology

Luz¹,

Silva²,

Hinestroza³

2013

International Journal of Polymer Analysis and Characterization

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“…As the PB approach intrinsically averages over solvent degrees of freedom, and the solvent field is largely independent of the solute configuration, we carried out single-point calculations. The solute molecule was enclosed by a surface defined by the atomic radii parameters optimized by Swanson et al for smoothed surfaces, 54 inside of which an internal (solute) dielectric of 2 was designated, and outside of which was designated a medium whose dielectric was set equal to the experimental static dielectric constant 55 of each of the seven solvents examined. The full PB equation was solved numerically on a cubic grid with a mesh spacing of 0.25 Å using the APBS software package 4 with point charges smoothed via cubic B-splines, while the dielectric bounding surface was smoothed with a 7 th order polynomial.…”

Section: Methodsmentioning

confidence: 99%

Calculations of the Electric Fields in Liquid Solutions

et al. 2013

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The electric field created by a condensed phase environment is a powerful and convenient descriptor for intermolecular interactions. Not only does it provide a unifying language to compare many different types of interactions, but it also possesses clear connections to experimental observables, such as vibrational Stark effects. We calculate here the electric fields experienced by a vibrational chromophore (the carbonyl group of acetophenone) in an array of solvents of diverse polarities using molecular dynamics simulations with the AMOEBA polarizable force field. The mean and variance of the calculated electric fields correlate well with solvent-induced frequency shifts and band broadening, suggesting Stark effects as the underlying mechanism of these key solution phase spectral effects. Compared to fixed-charge and continuum models, AMOEBA was the only model examined that could describe non-polar, polar, and hydrogen bonding environments in a consistent fashion. Nevertheless, we found that fixed-charge force fields and continuum models were able to replicate some results of the polarizable simulations accurately, allowing us to clearly identify which properties and situations require explicit polarization and/or atomistic representations to be modeled properly, and for which properties and situations simpler models are sufficient. We also discuss the ramifications of these results for modeling electrostatics in complex environments, such as proteins.

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“…The absorptivity at about 400 nm increases considerably in the series toluene>CH 3 CN>DMSO>THF (Figure ). The trend is not reflected by standard solvent properties such as dielectric constants (toluene 2.38; CH 3 CN 36.64; DMSO 47.24; THF 7.52) and hence, it is suggested that an indirect effect through the metal‐ion coordination (O donor, N donor, π donor) is involved, which shifts the intense π–π* band to lower energy.…”

Section: Resultsmentioning

confidence: 99%

Alkali Blues: Blue‐Emissive Alkali Metal Pyrrolates

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Förster

Basché

et al. 2019

Chemistry A European J

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2‐Iminopyrroles [HtBuL, 4‐tert‐butyl phenyl(pyrrol‐2‐ylmethylene)amine] are non‐fluorescent π systems. However, they display blue fluorescence after deprotonation with alkali metal bases in the solid state and in solution at room temperature. In the solid state, the alkali metal 2‐imino pyrrolates, M(tBuL), aggregate to dimers, [M(tBuL)(NCR)]2 (M=Li, R=CH3, CH(CH3)CNH2), or polymers, [M(tBuL)]n (M=Na, K). In solution (solv=CH3CN, DMSO, THF, and toluene), solvated, uncharged monomeric species M(tBuL)(solv)m with N,N′‐chelated alkali metal ions are present. Due to the electron‐rich pyrrolate and the electron‐poor arylimino moiety, the M(tBuL) chromophore possesses a low‐energy intraligand charge‐transfer (ILCT) excited state. The chelated alkali cations rigidify the chromophore, restricting intramolecular motions (RIM) by the chelation‐enhanced fluorescence (CHEF) effect in solution and, consequently, switch‐on a blue fluorescence emission.

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Static Dielectric Constants of Pure Liquids and Binary Liquid Mixtures

Cited by 71 publications

References 0 publications

Curcumin-Loaded Biodegradable Electrospun Fibers: Preparation, Characterization, and Differences in Fiber Morphology

Curcumin-Loaded Biodegradable Electrospun Fibers: Preparation, Characterization, and Differences in Fiber Morphology

Calculations of the Electric Fields in Liquid Solutions

Alkali Blues: Blue‐Emissive Alkali Metal Pyrrolates

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