Now showing items 1-11 of 11

• #### Anisotropic contribution to the van der Waals and the Casimir-Polder energies for CO2 and CH4 molecules near surfaces and thin film ﻿

(Journal article; Peer reviewed, 2015)
In order to understand why carbon dioxide ( CO 2 ) and methane ( CH 4 ) molecules interact differently with surfaces, we investigate the Casimir-Polder energy of a linearly polarizable CO 2 molecule and an isotropically ...
• #### Dispersion forces in inhomogeneous planarly layered media: A one-dimensional model for effective polarizabilities ﻿

(Journal article; Peer reviewed, 2019)
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 ...
• #### Distance-dependent sign reversal in the Casimir-Lifshitz torque ﻿

(Journal article; Peer reviewed, 2018)
The Casimir-Lifshitz torque between two biaxially polarizable anisotropic planar slabs is shown to exhibit a nontrivial sign reversal in its rotational sense. The critical distance $a_c$ between the slabs that marks this ...
• #### Effect of excess charge carriers and fluid medium on the magnitude and sign of the Casimir-Lifshitz torque ﻿

(Journal article; Peer reviewed, 2019)
Last year, we reported a perturbative theory of the Casimir-Lifshitz torque between planar biaxially anisotropic materials in the retarded limit [Thiyam et al., Phys. Rev. Lett. 120, 131601 (2018)], which is applied here ...
• #### Effective polarisability models ﻿

(Journal article; Peer reviewed, 2017)
Theories for the effective polarizability of a small particle in a medium are presented using different levels of approximation: we consider the virtual cavity, real cavity, and the hard-sphere models as well as a continuous ...
• #### Finite-size-dependent dispersion potentials between atoms and ions dissolved in water ﻿

(Journal article; Peer reviewed, 2014)
A non-expanded theory is used for dispersion potentials between atoms and ions dissolved in a medium. The first-order dispersion interaction between two atoms in an excited state must account for the fact that the two atoms ...
• #### Ice particles sink below the water surface due to a balance of salt, van der Waals and buoyancy forces ﻿

(Journal article; Peer reviewed, 2018)
According to the classical Archimedes’ principle, ice floats in water and has a fraction of its volume above the water surface. However, for very small ice particles, other competing forces such as van der Waals forces due ...
• #### Lifshitz interaction can promote ice growth at water-silica interfaces ﻿

(Journal article; Peer reviewed, 2017)
At air-water interfaces, the Lifshitz interaction by itself does not promote ice growth. On the contrary, we find that the Lifshitz force promotes the growth of an ice film, up to 1–8 nm thickness, near silica-water ...
• #### Non-perturbative theory of dispersion interactions ﻿

(Journal article; Peer reviewed, 2015)
Some open questions exist with fluctuation-induced forces between extended dipoles. Conventional intuition derives from large-separation perturbative approximations to dispersion force theory. Here, we present a full ...
• #### Nonperturbative theory for the dispersion self-energy of atoms ﻿

(Journal article; Peer reviewed, 2014)
We go beyond the approximate series expansions used in the dispersion theory of finite-size atoms. We demonstrate that a correct, and nonperturbative, theory dramatically alters the dispersion self-energies of atoms. The ...
• #### The influence of Lifshitz forces and gas on premelting of ice within porous materials ﻿

(Journal article; Peer reviewed, 2016)
Premelting of ice within pores in earth materials is shown to depend on the presence of vapor layers. For thick vapor layers between ice and pore surfaces, a nanosized water sheet can be formed due to repulsive Lifshitz ...