Related Experiment Video
Updated: Mar 17, 2026
10:38
Label-free Isolation and Enrichment of Cells Through Contactless Dielectrophoresis
Published on: September 3, 2013
16.7K
van der Waals torque and force between dielectrically anisotropic layered media
Bing-Sui Lu1, Rudolf Podgornik1
1Department of Theoretical Physics, J. Stefan Institute, 1000 Ljubljana, Slovenia.
The Journal of Chemical Physics
|August 1, 2016
Summary
This study explores van der Waals interactions in layered media. Researchers developed a transfer matrix method to analyze how layer properties influence forces and torques, offering insights into tuning these interactions.
Area of Science:
- Physics
- Materials Science
- Physical Chemistry
Background:
- Van der Waals interactions are crucial in nanoscale systems.
- Dielectric anisotropy in layered media significantly influences these interactions.
- Understanding these forces is key for designing advanced materials and devices.
Purpose of the Study:
- To develop a general formalism for analyzing van der Waals forces and torques.
- To investigate interactions between anisotropic layered media separated by an isotropic solvent.
- To explore how structural parameters affect these interactions.
Main Methods:
- Utilized a transfer matrix formalism.
- Analyzed systems with single and multilayered anisotropic/isotropic media.
- Investigated scenarios with varying optic axis orientations and angular mismatches.
Main Results:
- Developed a method to calculate van der Waals torque and force.
- Showcased how layer thickness and angular configurations tune interactions.
- Identified key parameters controlling the behavior of van der Waals forces and torques.
Conclusions:
- The transfer matrix method provides a versatile tool for studying van der Waals interactions.
- Structural and orientational parameters offer significant control over interaction forces and torques.
- Findings are applicable to systems involving anisotropic layered materials.
Related Concept Videos
01:17Gauss's Law in Dielectrics
5.3K
Consider a polar dielectric placed in an external field. In such a dielectric, opposite charges on adjacent dipoles neutralize each other, such that the net charge within the dielectric is zero. When a polar dielectric is inserted in between the capacitor plates, an electric field is generated due to the presence of net charges near the edge of the dielectric and the metal plates interface. Since the external electrical field merely aligns the dipoles, the dielectric as a whole is neutral. An...
5.3K
01:31Dielectric Polarization in a Capacitor
6.4K
The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
6.4K
01:27Electrostatic Boundary Conditions in Dielectrics
2.0K
When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's permittivity....
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's permittivity....
2.0K
01:30The Electrical Double Layer
105
In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
105
01:29Potential Due to a Polarized Object
885
A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
885
01:24Van der Waals Interactions
72.9K
Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.
72.9K