C10

Wohlfarth, Ch.; Wohlfahrt, B.

doi:10.1007/10639283_11

Cited by 2 publications

(3 citation statements)

References 189 publications

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“…The following correlations give the temperature dependence of the physicochemical properties of alkanes 19,20,21,22,23,24 :…”

Section: Theorymentioning

confidence: 99%

“…The modified Stokes–Einstein relation gives the temperature dependence of the diffusion coefficient, D , through the temperature dependence of the dynamic viscosity, η. The following correlations give the temperature dependence of the physicochemical properties of alkanes − The saturation ratio is obtained as , where T 0 is the initial temperature (ambient temperature in the experiments), for which f = 1. The values of the coefficients a i for the dynamic viscosity, b i for the surface tension, and c i for Henry’s constant ( i = 0–3) are given in Table .…”

Section: Theorymentioning

confidence: 99%

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Stability of Clay Particle-Coated Microbubbles in Alkanes against Dissolution Induced by Heating

et al. 2017

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We investigated the dissolution and morphological dynamics of air bubbles in alkanes stabilized by fluorinated colloidal clay particles when subjected to temperature changes. A model for bubble dissolution with time-dependent temperature reveals that increasing the temperature enhances the bubble dissolution rate in alkanes, opposite to the behavior in water, due to the differing trends in gas solubility. Experimental results for uncoated air bubbles in decane and hexadecane confirm this prediction. Clay-coated bubbles in decane and hexadecane are shown to be stable in air-saturated oil at constant temperature, where dissolution is driven mainly by the Laplace pressure. When the temperature increases from ambient, the particle-coated bubbles are prone to dissolution as the oil phase becomes under-saturated. The interfacial layer of particles is observed to undergo buckling and crumpling, without shedding of clay particles. Increasing the concentration of particles is shown to enhance the bubble stability by providing a higher resistance to dissolution. When subjected to complex temperature cycles, for which the effect of the time-dependent temperature is dominant, the clay-coated bubbles can resist long-term dissolution in conditions for which uncoated bubbles dissolve completely. These results underpin the design of ultra-stable oil foams stabilized by solid particles with improved shelf life under changing environmental conditions. † These authors contributed equally 2/21

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“…The following correlations give the temperature dependence of the physicochemical properties of alkanes 19,20,21,22,23,24 :…”

Section: Theorymentioning

confidence: 99%

Section: Theorymentioning

confidence: 99%

Stability of Clay Particle-Coated Microbubbles in Alkanes against Dissolution Induced by Heating

et al. 2017

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“…As expected, for all the studied NADES, the viscosity decreases exponentially with increasing temperature and increases with increasing flavonoid content. For the NADES with flavone or flavanone, the viscosity has similar values when the composition is the same for the NADES composed of either thymol or carvacrol, which may be because these two compounds are isomers, as the pure compounds also have similar viscosities (thymol = 26 mPa.s and carvacrol = 28.7 mPa.s at 298 K). However, for NADES containing 2′-hydroxychalcone that is not the case: for the same compositions of thymol or carvacrol, there are some differences in the viscosity.…”

Section: Results and Discussionmentioning

confidence: 94%

Diving into Natural Solvents: A Comprehensive Analysis of Deep Eutectic Systems Based on Terpenes and Flavonoids

Jeremias,

Marques,

Afonso

et al. 2024

J. Chem. Eng. Data

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Terpenes and flavonoids are secondary metabolites present in plants that display interesting biological properties. In this work, we study six nonionic (type V) natural deep eutectic solvents (NADES), in a total of nine studied, based on three terpenes (d,l-menthol, thymol, and carvacrol), used as hydrogen-bond donors, combined with three flavonoids (flavone, flavanone, and 2′-hydroxychalcone), which act as hydrogen-bond acceptors. These NADES were characterized in terms of their solid–liquid phase diagrams to evaluate their liquid window. The collected data were modeled using the universal quasichemical (UNIQUAC) model, providing a detailed correlation with the nonidealities of these systems. All systems, except for those containing α-terpineol, present large deviations from the ideal behavior, which justifies the use of an excess Gibbs energy model such as UNIQUAC. Thermophysical properties, including mutual water solubility, density, and viscosity, were measured. The three flavonoid-based NADES present very similar densities but very different viscosities, with the flavone-based being the most viscous and the 2′-hydroxychalcone-based being the most fluid, with viscosity increasing with the increase in the flavonoid content. All the studied NADES are hydrophobic, and generally, the water solubility decreases with the flavonoid proportion, with the exception of the flavone:thymol (0.4) NADES. The solubility of water in the selected terpenes and flavonoids is much lower than the solubility of water in the corresponding NADES. For all NADES the eutectic points occurred at small molar fractions of flavonoids. Cytotoxicity assays demonstrate safe use, with a toxicity level like those of starting components.

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C10

Cited by 2 publications

References 189 publications

Stability of Clay Particle-Coated Microbubbles in Alkanes against Dissolution Induced by Heating

Stability of Clay Particle-Coated Microbubbles in Alkanes against Dissolution Induced by Heating

Diving into Natural Solvents: A Comprehensive Analysis of Deep Eutectic Systems Based on Terpenes and Flavonoids

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