Calculations of van der Waals forces across films of liquid helium using Lifshitz theory

1971 ◽  
Vol 5 (2) ◽  
pp. 177-189 ◽  
Author(s):  
P. Richmond ◽  
B. W. Ninham
Keyword(s):  
Liquid Helium ◽  
Van Der Waals ◽  
Van Der Waals Forces ◽  
Lifshitz Theory

scholarly journals Calculation of Hamaker Constants in Nonaqueous Fluid Media

2000 ◽  
Vol 624 ◽  
Author(s):  
Nelson Bell ◽  
Duane Dimos
Keyword(s):  
Van Der Waals ◽  
Van Der Waals Forces ◽  
Dielectric Materials ◽  
Van Der Waals Interactions ◽  
Experimental Measurements ◽  
Dielectric Data ◽  
Fluid Media ◽  
Lifshitz Theory ◽  
Hamaker Constants

ABSTRACTCalculations of the Hamaker constants representing the van der Waals interactions between conductor, resistor and dielectric materials are performed using Lifshitz theory. The calculation of the parameters for the Ninham-Parsegian relationship for several non-aqueous liquids has been derived based on literature dielectric data. Discussion of the role of van der Waals forces in the dispersion of particles is given for understanding paste formulation. Experimental measurements of viscosity are presented to show the role of dispersant truncation of attractive van der Waals forces

scholarly journals Calculation of Hamaker Constants in Nonaqueous Fluid Media

2000 ◽  
Vol 625 ◽  
Author(s):  
Nelson Bell ◽  
Duane Dimos
Keyword(s):  
Van Der Waals ◽  
Van Der Waals Forces ◽  
Dielectric Materials ◽  
Van Der Waals Interactions ◽  
Experimental Measurements ◽  
Dielectric Data ◽  
Fluid Media ◽  
Lifshitz Theory ◽  
Hamaker Constants

AbstractCalculations of the Hamaker constants representing the van der Waals interactions between conductor, resistor and dielectric materials are performed using Lifshitz theory. The calculation of the parameters for the Ninham-Parsegian relationship for several non-aqueous liquids has been derived based on literature dielectric data. Discussion of the role of van der Waals forces in the dispersion of particles is given for understanding paste formulation. Experimental measurements of viscosity are presented to show the role of dispersant truncation of attractive van der Waals forces.

Self-Assembly of a Chiral Cubic Three-Connected Net from the High Symmetry Molecules C60 and SnI4

2020 ◽  
Author(s):  
Daniel B. Straus ◽  
Robert J. Cava
Keyword(s):  
Organic Synthesis ◽  
Self Assembly ◽  
Van Der Waals ◽  
Van Der Waals Forces ◽  
High Symmetry ◽  
Molecular Chirality ◽  
Chiral Materials ◽  
Self Assembled ◽  
Chiral Centers

The design of new chiral materials usually requires stereoselective organic synthesis to create molecules with chiral centers. Less commonly, achiral molecules can self-assemble into chiral materials, despite the absence of intrinsic molecular chirality. Here, we demonstrate the assembly of high-symmetry molecules into a chiral van der Waals structure by synthesizing crystals of C<sub>60</sub>(SnI<sub>4</sub>)<sub>2</sub> from icosahedral buckminsterfullerene (C<sub>60</sub>) and tetrahedral SnI4 molecules through spontaneous self-assembly. The SnI<sub>4</sub> tetrahedra template the Sn atoms into a chiral cubic three-connected net of the SrSi<sub>2</sub> type that is held together by van der Waals forces. Our results represent the remarkable emergence of a self-assembled chiral material from two of the most highly symmetric molecules, demonstrating that almost any molecular, nanocrystalline, or engineered precursor can be considered when designing chiral assemblies.

scholarly journals Nanotube‐Based 1D Heterostructures Coupled by van der Waals Forces

Small ◽  
2021 ◽  
pp. 2102585
Author(s):  
Sofie Cambré ◽  
Ming Liu ◽  
Dmitry Levshov ◽  
Keigo Otsuka ◽  
Shigeo Maruyama ◽  
...  
Keyword(s):  
Van Der Waals ◽  
Van Der Waals Forces
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