Dielectric Constant of Mixtures of Carbon Dioxide and n-Dodecane Between 283 K and 343 K

Sedrez, Paulo C.; Sánchez, Carlos Alberto Pacheco; Silva, Marco J. da; Barbosa, Jader R.

doi:10.1007/s10765-019-2597-y

Cited by 7 publications

(3 citation statements)

References 26 publications

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“…The alcohol concentrations used in the current study are small (∼4% v/v) and do not result in changes in ε o that are large enough to result in significant changes in the barrier height or well depth in the thermodynamic model. Additionally, the ε o of the oil phases used are very similar to one another (range from ∼1.84 to 2.01) and also do not result in significant changes to the driving force in the model. − Furthermore, the AuNPs used in the current study are only partially charged, which further diminishes the effect that ε o has on their adsorption. Therefore, in this system, it seems that the only possible mechanisms that alcohol could use to drive interfacial adsorption are through its interaction with the oil–water interface to vary γ ow or through interactions with NPs.…”

Section: Resultsmentioning

confidence: 79%

Tunable Approach to Induce the Formation of Flexible Nanofilms from Small (3 nm) Gold Nanoparticles at Oil–Water Interfaces

Cameron,

Zhang,

Curtis

et al. 2024

J. Phys. Chem. B

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The self-assembly of gold nanoparticles (AuNPs) into thin films at the liquid−liquid interface has promising applications in industries such as catalysis, optics, and sensors. However, precise control over their formation is complex, influenced by several factors which scale differently with core size. Due to their small free energy of adsorption, there are few examples of AuNPs with core diameters <10 nm. The present research evaluates the adsorption of ∼3 nm AuNPs from either side of the oil−aqueous interface with variations in ligand shell composition, the oil phase composition, and the structure of alcohol additives to best drive thin-film formation. Film formation and quality are evaluated, and a recent thermodynamic model is used to gain insight into the primary forces promoting this adsorption. Results demonstrate that longer-chain alcohol additives (namely, n-butanol and n-hexanol) induced adsorption more efficiently than shorter-chain alcohols (ethanol). The volume of alcohol additive needed to induce adsorption was dependent upon the ligand composition, suggesting that the mechanism for induced interfacial adsorption is via interaction with the AuNP ligand shell. Comparison with the thermodynamic model indicates that the driving force for this induced adsorption is the alteration of the three-phase contact angle. Additionally, the use of various oils demonstrates that as oil−water interfacial tension increases, more AuNPs adsorb to the interface. This relationship is also supported by the model. Insight gained for favorable conditions of adsorption for AuNPs < 10 nm as well as the underlying thermodynamic mechanism is important in working toward the ability to fine-tune such films for industrial applications.

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Section: Resultsmentioning

confidence: 79%

Tunable Approach to Induce the Formation of Flexible Nanofilms from Small (3 nm) Gold Nanoparticles at Oil–Water Interfaces

Cameron,

Zhang,

Curtis

et al. 2024

J. Phys. Chem. B

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“…The dielectric constants of the P(PFS-b-AA) copolymers were calculated using the reported values for PPFS (k PPFS = 2.28) and PAA (k PAA = 5) homopolymers and dodecane (k C12 = 2.01) from the literature. 30,[39][40][41][42] In Fig. 5b, the predicted dielectric permittivity calculated using the Lichtenecker model is plotted with the experimental dielectric permittivity data at 1000 Hz.…”

Section: Resultsmentioning

confidence: 99%

Control over microphase separation and dielectric properties via para-fluoro thiol click reaction

et al. 2022

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“…Significant deviations may occur in correlations of ε r,mix by empirical models parametrized by volumetric compositions, which only represent ideal two-phase bulk mixing state but not molecular mixing state and interactions between the components. 52 When the mixture is subjected to MW irradiation, part of the absorbed MW energy is utilized for polarization of the fluid that varies the chemical potentials of the components. Thus, the Gibbs free energy change (ΔG m ) by MW polarization is expressed by…”

Section: Methodsmentioning

confidence: 99%

Determining Dielectric Constants for Complex Solvent Mixtures by Microwave Sensing and Model Prediction

et al. 2021

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The frequency-dependent dielectric constant is a basic fluid property that is currently challenging to determine for complex liquid mixtures. Here, we report the determination of effective dielectric constants for various solvent mixtures under flow conditions using a simple in-line microwave Fabry–Pérot interferometer cable sensor. An ideal solution model-based mixing rule has been established and demonstrated for significantly improved prediction of dielectric constants for single-phase solvent mixtures. However, the current mixing rules exhibit large deviations for immiscible water/oil dispersions apparently because of the effects of strong interfacial polarizations on the overall mixture polarizability that are not accounted for by the models.

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Dielectric Constant of Mixtures of Carbon Dioxide and n-Dodecane Between 283 K and 343 K

Cited by 7 publications

References 26 publications

Tunable Approach to Induce the Formation of Flexible Nanofilms from Small (3 nm) Gold Nanoparticles at Oil–Water Interfaces

Tunable Approach to Induce the Formation of Flexible Nanofilms from Small (3 nm) Gold Nanoparticles at Oil–Water Interfaces

Control over microphase separation and dielectric properties via para-fluoro thiol click reaction

Determining Dielectric Constants for Complex Solvent Mixtures by Microwave Sensing and Model Prediction

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