Dielectric properties of normal supercooled water obtained in alcohol/water mixtures

Noyel, G.; Jorat, L.; Derriche, O.; Huck, J.

doi:10.1109/14.204864

Cited by 11 publications

(3 citation statements)

References 16 publications

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“…Typical rate constants for the ␤-relaxation are larger than 10 6 s Ϫ1 . 48,49 Similar linear dependencies have also been found for triphenylmethane dyes, 7,27 which are also present in the class of TICT molecules. 15,16 In all these cases, the rate constants for the formation of the photochemical product states are all situated on a nanosecond time scale, and a linear Arrhenius behavior was found for these compounds.…”

Section: Discussion Of Free Volume Effectssupporting

confidence: 50%

“…48 In this region, mainly the ␤-relaxation process of the solvent is monitored by the probe molecule. The ␤-relaxation corresponds to a relaxation of chain segments or clusters within a solvent or polymer, 49 and it shows usually a linear Arrhenius behavior. Typical rate constants for the ␤-relaxation are larger than 10 6 s Ϫ1 .…”

Section: Discussion Of Free Volume Effectsmentioning

confidence: 99%

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Photophysical properties of fluorescence probes I: dialkylamino stilbazolium dyes

Strehmel¹,

Rettig

1996

J. Biomed. Opt.

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The photophysical and photochemical behavior of different isomers of dimethylamino-stilbazolium dyes was investigated in n-alcohols at different temperatures by stationary and time-resolved fluorescence measurements. At room temperature, an efficient nonradiative deactivation k nr was observed, which increases in high-polarity and low-viscosity solvents. For viscosities р 10 cP, k nr possesses a linear viscosity dependence. At low temperatures, the fluorescence spectra show considerable blue shifts, which are absent in solvent polarity changes relative to room temperature, and a spectral narrowing. From the combined quantum yield and lifetime measurements, k nr is shown to decrease strongly with decreasing temperature, by more than two orders of magnitude, and k f is shown to increase. These facts and the observation of an initial lifetime lengthening by increasing the temperature from 77 K indicate several simultaneously emitting states with a temperature-dependent population efficiency. These states were tentatively assigned to several possible single-bond twisted excited conformers. This assignment is supported by the near absence of isomerization.

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Section: Discussion Of Free Volume Effectssupporting

confidence: 50%

Section: Discussion Of Free Volume Effectsmentioning

confidence: 99%

Photophysical properties of fluorescence probes I: dialkylamino stilbazolium dyes

Strehmel¹,

Rettig

1996

J. Biomed. Opt.

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“…Many data have been measured just for this work (specifically for the water–methanol solutions ( Figure 1 a) at

for

K; in the water–glycerol case ( Figure 1 b), the measured concentrations are

for

K). All other data come from the literature: for the methanol solutions, References [ 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 ] and, for those of glycerol, References [ 48 , 57 , 58 , 59 , 60 , 61 ]. For water, the reported data come from different experimental approaches: the bulk water data (reported as fully blue symbols) come from NMR experiments [ 62 , 63 ]; fused amorphous water (dark blue squares [ 22 ]) and MCM confined (actually measured NMR data are illustrated as dark blue squares and as open blue triangles [ 32 ]; and finally, the dielectric relaxation data [ 64 ] are illustrated as blue open circles).…”

Section: Data and Data Analysismentioning

confidence: 99%

Hydrophilic and Hydrophobic Effects on the Structure and Themodynamic Properties of Confined Water: Water in Solutions

Mallamace

Chen

et al. 2021

IJMS

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NMR spectroscopy is used in the temperature range 180–350 K to study the local order and transport properties of pure liquid water (bulk and confined) and its solutions with glycerol and methanol at different molar fractions. We focused our interest on the hydrophobic effects (HE), i.e., the competition between hydrophilic and hydrophobic interactions. Nowadays, compared to hydrophilicity, little is known about hydrophobicity. Therefore, the main purpose of this study is to gain new information about hydrophobicity. As the liquid water properties are dominated by polymorphism (two coexisting liquid phases of high and low density) due to hydrogen bond interactions (HB), creating (especially in the supercooled regime) the tetrahedral networking, we focused our interest to the HE of these structures. We measured the relaxation times (T1 and T2) and the self-diffusion (DS). From these times, we took advantage of the NMR property to follow the behaviors of each molecular component (the hydrophilic and hydrophobic groups) separately. In contrast, DS is studied in terms of the Adam–Gibbs model by obtaining the configurational entropy (Sconf) and the specific heat contributions (CP,conf). We find that, for the HE, all of the studied quantities behave differently. For water–glycerol, the HB interaction is dominant for all conditions; water–methanol, two different T-regions above and below 265 K are observable, dominated by hydrophobicity and hydrophilicity, respectively. Below this temperature, where the LDL phase and the HB network develops and grows, with the times and CP,conf change behaviors leading to maxima and minima. Above it, the HB becomes weak and less stable, the HDL dominates, and hydrophobicity determines the solution.

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Static permittivity of normal supercooled water by study of alkylhydrazines/water mixtures

Noyel

Jorat

Ferriol

et al. 1994

Journal of Molecular Liquids

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Dielectric properties of normal supercooled water obtained in alcohol/water mixtures

Cited by 11 publications

References 16 publications

Photophysical properties of fluorescence probes I: dialkylamino stilbazolium dyes

Photophysical properties of fluorescence probes I: dialkylamino stilbazolium dyes

Hydrophilic and Hydrophobic Effects on the Structure and Themodynamic Properties of Confined Water: Water in Solutions

Static permittivity of normal supercooled water by study of alkylhydrazines/water mixtures

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