Van der Waals Attraction of Hydrogen Atoms

Journal of Experimental and Theoretical Physics - The potential energy of attraction between hydrogen atoms spaced by distance R on the order of aB/α, where aB is the Bohr radius and α =...     

Increase in Axial Compressibility in a Spinning Van der Waals Gas

We investigated the adiabatic compression along the axial direction of a spinning Van der Waals gas by applying theoretical analysis and molecular dynamics (MD) simulations. Based on the analytical results, the rotation-induced compressibility increase effect is significant in a Van der Waals gas, while the attraction term in the Van der Waals equation of states (EOS) contributes significantly to the compressibility increase in a spinning system. We conducted MD simulations to the axial compression of a spinning gas, whose state is far from the ideal gas state, and further demonstrated that the rotation-induced compressibility increase effect in a dense state is robust, implying that such a phenomenon can be detected in experiments under high-energy-density conditions.     

Van der Waals interaction of membranes

The van der Waals interaction of hydrocarbon films in water is calculated using the exact expression derived by Parsegian and Ninham. The results are compared to an often used approximation, which fails for this system due to the large difference between the static dielectric constants of hydrocarbons and water. For large membrane separations the correct value of the van der Waals interaction is about a hundred times larger than the approximate result. The consequences for predicting unbinding transitions and interpreting experiments are discussed.Dedicated to Prof. Herbert Wagner on the occasion of his 60th birthday     

Self-diffusion in Kr compared with Van der Waals model

The predictions of the Van der Waals model for the self-diffusion in Kr are compared with the experimental results at 220 K and for 0.7ρ_c ? ρ ? 2.1ρ_c. The Van der Waals model fails to represent the Kr data while at the same temperature in the case of CH₄ this model works quite well for ρ_c < ρ ? 3ρ_c.     

Van der Waals forces in electrolyte solutions

In this article we study van der Waals forces in electrolyte solutions from a local point of view. It is shown for arbitrary geometry that the classical limit of the force density exerted on the ions, as found in the macroscopic theory of van der Waals forces, is identical with the force density calculated from electrostatics and thermodynamic fluctuation theory. Thus neither retardation, nor the Lorentz force affect the average force density.     

Geometrothermodynamics of Van der Waals black hole

We study the geometrothermodynamics of a special asymptotically AdS black hole, i.e. Van der Waals \(\left( VdW\right) \) black hole, in the extended phase space where the negative cosmological constant \(\Lambda \) can be regarded as thermodynamic pressure. Analysing some special conditions of this black hole with geometrothermodynamical method, we find a good correlation with ordinary cases according to the state equation.     

Role of Van der Waals Forces in Graphene Adsorption over Pd, Pt, and Ni

We report ab initio computations with the Vienna Ab initio Simulation Package (VASP) aimed at elucidating the adsorption mechanism of graphene-like structures on (111) Pd, Pt, and Ni surfaces. To study the adsorption properties, we simulate an already-formed graphene layer. We present a comparative discussion of the graphene interactions with the three metals, focusing on the very particular adsorption of graphene over Pd.     

动力学压缩真空中的Van der Waals力

基于参数动力学过程产生的压缩效应,利用Millonni源理论方法研究了 动力学压缩真空中Van der Waals力的性质及其与真空压缩的关系。所得结果表明：Van der Waals力的性质依赖于真空压缩的程度;在一定的临界条件下,Van der Waals力由通常的 吸引性作用转化为排斥性作用。当压缩系数为零时,所得结果与通常文献完全一致。     

Improved description of the Van der Waals interaction in physisorption

The attractive interaction between an atom and a metal surface is calculated, taking into account the d-electron contribution to the metal response, together with an atomic polarizability going beyond the dipole approximation. A numerical calculation is presented for helium on noble metals, giving a slightly deeper physiosorption well compared to the “standard” treatment.     

Van der Waals interactions in DFT made easy by Wannier functions

Ubiquitous van der Waals interactions between atoms and molecules are important for many molecular and solid structures. These systems are often studied from first principles using the density functional theory (DFT). However, the commonly used DFT functionals fail to capture the essence of van der Waals effects. Most attempts to correct for this problem have a basic semiempirical character, although computationally more expensive first principles schemes have been recently developed. We here describe a novel approach, based on the use of the maximally localized Wannier functions, that appears to be promising, being simple, efficient, accurate, and transferable (charge polarization effects are naturally included). The results of test applications to small molecules and bulk graphite are presented.     

范德瓦耳斯和他的状态方程

在物理学发展史上，范德瓦耳斯对气—液流体系统做了开创性的研究工作，建立了人类历史上第一个既能反映气、液各相性质，又能描述相交和临界现象的状态方程。范德瓦耳斯的理论成就和研究方法对热力学、统计力学和低温物理学的发展产生了重要而深远的影响。文章系统探讨了范德瓦耳斯方程产生的历史背景、科学意义和局限性，讨论了范德瓦耳斯的理论和方法对当代物理学的启发意义。     

范德瓦尔斯方程的分子平均场理论推导

利用气体分子动理论和分子平均场理论,导出了真实气体物态方程--范德瓦尔斯方程,并与统计力学严格的理论推导结果作比较,得到了反映真实气体分子作用域大小的一个较为具体的参考值.     

Van der Waals broadening of argon absorption lines

Van der Waals broadening coefficients for Ar absorption lines have been measured using the resonant Faraday effect. These coefficients have the values of 2·9 ± 0·8, 2·4 ± 0·3, 1·9 ± 0·2 (in units of 10^?20 cm^?1 ?cm^?3) for the lines 6965 Å, 7067 Å, 7635 Å and 8115 Å, respectively, respectively. The measured coefficients are in reasonable agreement with measurements carried out on Ar emission lines and with theoretical calculations.     

On the self-diffusion coefficient of the Van der Waals fluid

We have calculated the first non-vanishing correction (∝γ²) to the self-diffusion coefficient D of a Van der Waals fluid, where the attractive forces are characterized by the inverse range γ, taken as a smallness parameter.     

On the macroscopic theory of retarded Van der Waals forces

The Lifshitz formula for the retarded dispersion force between two dielectric media at zero temperature is derived by a simple macroscopic method.     

Van der Waals interaction between flux lines in high- superconductors

In anisotropic or layered superconductors thermal fluctuations as well as impurities induce a van der Waals (vdW) attraction between flux lines, as has recently been shown by Blatter and Geshkenbein in the thermal case [#!BlatterGeshkenbein!#] and by Mukherji and Nattermann in the disorder dominated case [#!NattermannMukherji!#]. This attraction together with the entropic or disorder induced repulsion has interesting consequences for the low field phase diagram. We present two derivations of the vdW attraction, one of which is based on an intuitive picture, the other one following from a systematic expansion of the free energy of two interacting flux lines. Both the thermal and the disorder dominated case are considered. In the thermal case in the absence of disorder, we use scaling arguments as well as a functional renormalization of the vortex-vortex interaction energy to calculate the effective Gibbs free energy on the scale of the mean flux line distance. We discuss the resulting low field phase diagram and make quantitative predictions for pure BiSCCO (Bi₂Sr₂CaCu₂O₈). In the case with impurities, the Gibbs free energy is calculated on the basis of scaling arguments, allowing for a semi-quantitative discussion of the low-field, low-temperature phase diagram in the presence of impurities. Received: 9 February 1998 / Accepted: 17 April 1998