INTERACTION ENERGIES OF ORGANIC MOLECULES WITH RUTILE AND GRAPHON SURFACES FROM HEATS OF IMMERSION

1955 ◽  
Vol 33 (2) ◽  
pp. 251-258 ◽  
Author(s):  
J. J. Chessick ◽  
A. C. Zettlemoyer ◽  
F. H. Healey ◽  
G. J. Young
Keyword(s):  
Dipole Moment ◽  
Adsorption Energy ◽  
Organic Molecules ◽  
Average Distance ◽  
Van Der Waals ◽  
Surface Force ◽  
Organic Liquids ◽  
Heat Of Immersion ◽  
Heats Of Immersion ◽  
Wetting Liquid

The heats of immersion of rutile in a series of short chain organic liquids are found experimentally to be an approximate linear function of the dipole moment of the wetting liquid. The significance of the relation is discussed in terms of the polar van der Waals force contribution which is primarily dependent on dipole moment. The average distance of approach of a dipole to the rutile surface and the effective surface force field extending from the rutile surface are calculated.The net adsorption energy, which is calculated directly from heat of immersion data, is related to the energy contributions resulting from the various polar and nonpolar van der Waals forces active in the adsorption process: These energy contributions which make up the total adsorption energy are calculated for the interaction of an alcohol and a hydrocarbon with both a heteropolar (rutile) and a homopolar (Graphon) surface. On the basis of the results obtained, the effects of chain length and functionality of the liquids on the heat of immersion are discussed.

Adhesion Force Between High Energy Surfaces in Vapor Atmosphere

1994 ◽  
Vol 366 ◽  
Author(s):  
Jerome Crassous ◽  
Jean-Luc Loubet ◽  
Elisabeth Charlaix
Keyword(s):  
Liquid Bridge ◽  
Adhesion Force ◽  
Van Der Waals ◽  
Surface Force ◽  
High Energy ◽  
Attractive Force ◽  
Experimental Measurements ◽  
Metallic Substrates ◽  
Energy Surfaces ◽  
Good Agreement

ABSTRACTWe report experimental measurements of the adhesion force between metallic substrates in undersaturated heptane vapor atmosphere, with a surface force apparatus. The attractive force between the substrates is strongly dependant of the condensation of a liquid bridge connecting the surfaces. The results show the importance of wetting phenomena for the maximum attractive force: we find that this maximum attraction varies as the power two-third of the curvature of the meniscus connecting the surfaces, in good agreement with the theory of Van der Waals wetting.

Packing of Planar Organic Molecules: Interplay of van der Waals and Electrostatic Interaction

2008 ◽  
Vol 8 (8) ◽  
pp. 3053-3057 ◽  
Author(s):  
Daniel Käfer ◽  
Mira El Helou ◽  
Christian Gemel ◽  
Gregor Witte
Keyword(s):  
Electrostatic Interaction ◽  
Organic Molecules ◽  
Van Der Waals

scholarly journals The growth and assembly of organic molecules and inorganic 2D materials on graphene for van der Waals heterostructures

Carbon ◽  
2018 ◽  
Vol 131 ◽  
pp. 246-257 ◽  
Author(s):  
Akinola D. Oyedele ◽  
Christopher M. Rouleau ◽  
David B. Geohegan ◽  
Kai Xiao
Keyword(s):  
Organic Molecules ◽  
2D Materials ◽  
Van Der Waals ◽  
Van Der Waals Heterostructures

Enhanced van der Waals epitaxy of germanium by out-of-plane dipole moment induced from transferred graphene on TiN/AlN multilayers

2021 ◽  
Vol 130 (20) ◽  
pp. 205301
Author(s):  
Xuejing Wang ◽  
Yeonhoo Kim ◽  
Jon K. Baldwin ◽  
Andrew C. Jones ◽  
Jeeyoon Jeong ◽  
...  
Keyword(s):  
Dipole Moment ◽  
Van Der Waals ◽  
Out Of Plane

Demarcation boundary between region dominated by elastohydrodynamic lubrication and that by the surface force action for different elliptical ratios

2017 ◽  
Vol 69 (2) ◽  
pp. 215-224
Author(s):  
Mohamed Abd Al-Samieh
Keyword(s):  
Van Der Waals ◽  
Elastohydrodynamic Lubrication ◽  
Hydrodynamic Pressure ◽  
Surface Force ◽  
Van Der Waals Force ◽  
Line Contact ◽  
Force Action ◽  
Content Type ◽  
Combined Action ◽  
Ellipticity Ratio

Purpose This paper aims to investigate the effect of changing speed of the entraining motion on the formation of ultra-thin lubricating films under different elliptical ratios. The ellipticity parameter (K) varied from 1 (a ball-on-plate configuration) to 6 (a configuration approaching line contact). The influence of the ellipticity parameters, the dimensionless speed and the effects of surface forces on the formation of the minimum film thickness has been demonstrated. The demarcation boundary between region dominated by elastohydrodynamic lubrication (EHL) and that by the surface force action has been demonstrated for different elliptical ratios. Design/methodology/approach The numerical solution has been carried out, using the Newton–Raphson iteration technique, applied for the convergence of the hydrodynamic pressure. The film thickness and pressure distribution are obtained by simultaneous solution of the Reynolds’ equation, the elastic deformation (caused by hydrodynamic pressure, surface force of solvation and Van der Waals force) and the load balance equation. The operating conditions, load and speed of entraining motion, promote formation of ultra-thin films that are formed under the combined action of EHL, surface contact force of solvation and molecular interactions due to presence of Van der Waals force. Findings The paper provides insights about the transition between region dominated by EHL and that by the surface force action for changing ellipticity ratio (K) from 1 (a ball-on-plate configuration) to 6 (a configuration approaching line contact). Originality/value This paper fulfils an identified need to study the effect of changing ellipticity ratio on the formation of ultra-thin films that are formed under the combined action of EHL, surface contact force of solvation and molecular interactions due to presence of Van der Waals force.

Dramatic vapor-phase modulation of the characteristics of graphene field-effect transistors

2015 ◽  
Vol 17 (28) ◽  
pp. 18426-18430 ◽  
Author(s):  
Barrett C. Worley ◽  
Seohee Kim ◽  
Saungeun Park ◽  
Peter J. Rossky ◽  
Deji Akinwande ◽  
...  
Keyword(s):  
Dipole Moment ◽  
Vapor Phase ◽  
Phase Modulation ◽  
Field Effect ◽  
Organic Molecules ◽  
Field Effect Transistors

Graphene FETs exposed to vapor-phase, polar, organic molecules exhibit shifts in Dirac voltage, the magnitude of which obviously increase with increasing dipole moment of each type of polar vapor.

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