Effective Polarizability Models

Fiedler, Johannes; Thiyam, Priyadarshini; Kurumbail, Anurag; Burger, Friedrich Anton; Walter, Michael; Persson, Clas; Brevik, Iver; Parsons, Drew F.; Boström, Mathias; Buhmann, Stefan Yoshi

doi:10.1021/acs.jpca.7b10159

Cited by 40 publications

(58 citation statements)

References 50 publications

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“…A 5-mode fit has previously been found to describe the dynamic polarisability accurately to a 0.02% relative error [41]. The adjusted parameters for a 5-mode model for CO 2 , CH 4 , N 2 , and H 2 S are given in our recent work [42]. Quantum Table 1: Hydrate mass densities (ρ h ) and number densities of water (n wh ) and gas molecules (n M ) in different gas hydrates.…”

Section: Materials Modellingmentioning

confidence: 99%

Dispersion Forces Stabilize Ice Coatings at Certain Gas Hydrate Interfaces That Prevent Water Wetting

Boström

Corkery

Lima

et al. 2019

ACS Earth Space Chem.

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Gas hydrates formed in oceans and permafrost occur in vast quantities on Earth representing both a massive potential fuel source and a large threat in climate forecasts. They have been predicted to be important on other bodies in our solar systems such as Enceladus, a moon of Saturn. CO 2 -hydrates likely drive the massive gas-rich water plumes seen and sampled by the spacecraft Cassini, and the source of these hydrates is thought to be due to buoyant gas hydrate particles. Dispersion forces cause gas hydrates to be coated in a 3-4 nm thick film of ice, or to contact water directly, depending on which gas they contain. These films are shown to significantly alter the properties of the gas hydrate clusters, for example, whether they float or sink. It is also expected to influence gas hydrate growth and gas leakage.

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Section: Materials Modellingmentioning

confidence: 99%

Dispersion Forces Stabilize Ice Coatings at Certain Gas Hydrate Interfaces That Prevent Water Wetting

Boström

Corkery

Lima

et al. 2019

ACS Earth Space Chem.

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“…with the relative coordinate ̺ = ̺e ̺ , into Eq. (1) and applying the local-field corrections [26][27][28], the van der Waals potential between two particles separated by a distance ̺ embedded in a medium with permittivity ε reads…”

Section: Medium-assisted London-van-der-waals Interactionsmentioning

confidence: 99%

“…and the hard-sphere model for interactions through a medium [27] α with a being the particle radius. Figure 1 shows the resulting van der Waals potentials for both the vacuum and the medium-assisted cases compared with the asymptotic expressions of Eqs.…”

Section: Medium-assisted London-van-der-waals Interactionsmentioning

confidence: 99%

“…Further, we use the finite-size model of Refs. [26,27] to describe the excess polarisability that arises when taking into account the finitesize effects of the particles and a vacuum layer surrounding the particle to avoid the contact between particle and solvent [35]. The calculated potentials and the corresponding asymptotes are depicted in Fig.…”

Section: Medium-assisted Casimir-polder Interactionmentioning

confidence: 99%

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Nontrivial retardation effects in dispersion forces: From anomalous distance dependence to novel traps

et al. 2020

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In the study of dispersion forces, nonretarded, retarded and thermal asymptotes with their distinct scaling laws are regarded as cornerstone results governing interactions at different separations. Here, we show that when particles interact in a medium, the influence of retardation is qualitatively different, making it necessary to consider the non-monotonous potential in full. We discuss different regimes for several cases and find an anomalous behaviour of the retarded asymptote. It can change sign, and lead to a trapping potential.

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“…Due to the presence of the particle, a Pauli exclusion cavity is formed [13] This has given rise to the development of a cavity model [14] describing the boundaries of both medium and particle as hard discontinuous changes in the permittivity. For the resulting excess polarisabilities, a spherical two-or three-layer system is considered for Onsager's real cavity model and the finite-size model, respectively.…”

Section: Introductionmentioning

confidence: 99%

Dispersion forces in inhomogeneous planarly layered media: A one-dimensional model for effective polarizabilities

et al. 2019

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Dispersion forces such as van der Waals forces between two microscopic particles, the Casimir-Polder forces between a particle and a macroscopic object or the Casimir force between two dielectric objects are well studied in vacuum. However, in realistic situations the interacting objects are often embedded in an environmental medium. Such a solvent influences the induced dipole interaction. With the framework of macroscopic quantum electrodynamics, these interactions are mediated via A PREPRINT -JUNE 5, 2019Figure 1: Sketch of the considered setups for the spherical problem and the one dimensional analogon: a) Two particles embedded in a medium creating an Onsager's real cavity with inhomogeneous dielectric profile; b) one-dimensional analogon with planarly inhomogeneous profile; c) Two spherical nano-particles embedded in a medium with an inhomogeneous cavity; d) the corresponding one-dimensional problem with two dielectric plates of finite thickness embedded in a medium with inhomogeneous profile.an exchange of virtual photons. Via this method the impact of a homogeneous solvent medium can be expressed as local-field corrections leading to excess polarisabilities which have previously been derived for hard boundary conditions. In order to develop a more realistic description, we investigate on a one-dimensional analog system illustrating the influence of a continuous dielectric profile.

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Effective Polarizability Models

Cited by 40 publications

References 50 publications

Dispersion Forces Stabilize Ice Coatings at Certain Gas Hydrate Interfaces That Prevent Water Wetting

Dispersion Forces Stabilize Ice Coatings at Certain Gas Hydrate Interfaces That Prevent Water Wetting

Nontrivial retardation effects in dispersion forces: From anomalous distance dependence to novel traps

Dispersion forces in inhomogeneous planarly layered media: A one-dimensional model for effective polarizabilities

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