scholarly journals Competition between Born solvation, dielectric exclusion, and Coulomb attraction in spherical nanopores

2021 ◽  
Vol 104 (4) ◽  
Author(s):  
Théo Hennequin ◽  
Manoel Manghi ◽  
John Palmeri
Keyword(s):  
Coulomb Attraction

Particle dynamics under Coulomb attraction and radiation pressure

1989 ◽  
Vol 40 (7) ◽  
pp. 3769-3776 ◽  
Author(s):  
H. A. Zachariades ◽  
E. A. Jackson
Keyword(s):  
Radiation Pressure ◽  
Particle Dynamics ◽  
Coulomb Attraction

Micro Mechanism of BaTiO3 Ferroelectric Phase Transition Described by Electron Cloud Model

2012 ◽  
Vol 479-481 ◽  
pp. 619-622
Author(s):  
Chao Fang ◽  
Liang Yan Chen
Keyword(s):  
Phase Transition ◽  
Dielectric Constant ◽  
Equilibrium Position ◽  
Ferroelectric Phase Transition ◽  
Ferroelectric Phase ◽  
Cloud Model ◽  
Electron Cloud ◽  
Oxygen Ions ◽  
Expansion Effect ◽  
Coulomb Attraction

In this paper the micro mechanism of BaTiO3 ferroelectric phase transition is studied based on the thermodynamic model using electron cloud model, and further the Curie - Weiss law is explained. The results indicate that the contraction of the electron cloud, as the temperature decreased through Curie temperature, causes oxygen ions shift the equilibrium position, and the Coulomb attraction makes Ti ion shift the equilibrium position causing phase transition; With temperature rising, the ion displacement polarization decreases owing to the electron cloud expansion effect, and the variation of dielectric constant with temperature follows the Curie - Weiss law.

Short and long range contributions to the inductive effect in π electron systems

1966 ◽  
Vol 291 (1425) ◽  
pp. 224-234 ◽  
Keyword(s):  
Long Range ◽  
Field Effect ◽  
Short Range ◽  
Inductive Effect ◽  
Electron Systems ◽  
Methyl Group ◽  
Range Type ◽  
Coulomb Type ◽  
Exchange Repulsion ◽  
Coulomb Attraction

It is shown that the inductive effect of a substituent can have contributions of both exchange and Coulomb type, but that the exchange terms can be treated empirically as though they arise from a short-range field effect. Calculations of the exchange terms for the halogens and the methyl group are in accord with the empirical values of inductive parameters deduced from spectroscopy. Evidence is given that for a methyl group the inductive perturbation is almost entirely of short range type and is probably dominated by the exchange terms but for a chloro substituent both the short range exchange repulsion and the long range Coulomb attraction are important.

Symmetry between Coulomb attraction and repulsion in radiative processes

1974 ◽  
Vol 9 (8) ◽  
pp. 2330-2339 ◽  
Author(s):  
P. J. Brussaard ◽  
S. Klarsfeld
Keyword(s):  
Radiative Processes ◽  
Coulomb Attraction

Ferromagnetic Intermolecular Interaction and Crystal Structure of α-Nitronyl Nitroxide

1989 ◽  
Vol 173 ◽  
Author(s):  
Kunio Awaga ◽  
Tamotsu Inabe ◽  
Yusei Maruyama
Keyword(s):  
Crystal Structure ◽  
Temperature Dependence ◽  
Intermolecular Interaction ◽  
Magnetic Coupling ◽  
Two Dimensional ◽  
Nitronyl Nitroxide ◽  
Magnetic Susceptibilities ◽  
X Ray ◽  
Nitronyl Nitroxides ◽  
Coulomb Attraction

ABSTRACTThe temperature dependence of the magnetic susceptibilities for several ±-nitronyl nitroxides have been measured. It is found that the intermolecular magnetic coupling in these radical crystals changes from antiferromagnetic to ferromagnetic depending on the substituents at ±-position. X-Ray crystal analysis and MO calculation have been carried out on the ferromagnetic ±-nitronyl nitroxide, 2-(4-nitrophenyl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazolyl-1-oxy 3-oxide, revealing a two-dimensional ferromagnetic network linked by the Nδ+...0δ− Coulomb attraction.

Local coulomb attraction for enhanced H2 evolution stability of metal sulfide photocatalysts

2018 ◽  
Vol 221 ◽  
pp. 152-157 ◽  
Author(s):  
Jun Jie Zhao ◽  
Yu Hang Li ◽  
Peng Fei Liu ◽  
Yu Lei Wang ◽  
Xu Lei Du ◽  
...  
Keyword(s):  
Metal Sulfide ◽  
H2 Evolution ◽  
Coulomb Attraction

Electroreflectance Study of Light-Emitting Porous Silicon

2000 ◽  
Vol 609 ◽  
Author(s):  
Toshihiko Toyama ◽  
Akihito Shimode ◽  
Hiroaki Okamoto
Keyword(s):  
Interband Transitions ◽  
Light Emitting ◽  
Transition Energies ◽  
Mass Approximation ◽  
Structure Changes ◽  
Energy Distance ◽  
Transmission Electron ◽  
Quantum Confined ◽  
Electroreflectance Spectroscopy ◽  
Coulomb Attraction

ABSTRACTElectroreflectance spectroscopy measurements have been performed on light-emitting porous Si (LEPSi). The transmission electron microscope measurements reveal that LEPSi includes Si nanocrystals with a mean crystal size of 1–2 nm. The ER features are observed at a transition energy of 3.4 eV in all of the samples, giving that LEPSi still keeps the threedimensional (3D) electronic structure. Changes in the transition energies are not found for LEPSi with the different mean crystal sizes. Furthermore, we directly observed interband transitions of quantized states due to quantum-confined electron-hole (e-h) pairs in LEPSi as two or three extra ER features being located between 1.2 and 3.1 eV which are never observed in bulk crystalline Si. Employing a simple effective mass approximation model, we have evaluated the reduced mass, the kinetic energies and the Coulomb attraction energies of the quantumconfined e-h pairs. We also found that the energy distance between the transition energies at the ground state and the photoluminescence (PL) peak energies basically corresponds to the Coulomb attraction energies. Finally, we propose a new luminescent model based on interband transitions involving the quantum-confined dense e-h plasma.

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