نتایج جستجو برای: electrostatic interaction

تعداد نتایج: 584666  

Journal: :Applied Mathematics and Computation 2015
Krassimir D. Danov

The electrostatic interactions between charged particles immersed in an ionic solution play an important role for the stability of colloidal dispersions. The distribution of the electrostatic potential in the continuous phase obeys the nonlinear Poisson–Boltzmann equation. This study aims to calculate the asymptotic expressions for the interaction force and torque between two parallel charged c...

2014
P. L. Anderson J. C. Lee V. Ristic T. D. Rognlien

This report describes a program of work in which both electrostatic and electromagnetic wave amplifying mechanisms are under investigation. For the former, studies in the absence of a static magnetic field are direcced towards verifying the theory for beam/surface wave amplification. Two distinctly different lines are being followed for interaction in the presence of a static magnetic iield: El...

1997
F. Spears

Gravity is electrostatic. This paper substantiates this claim by deriving, through basic electrostatic relationships, a simple equation for gravity forces that includes an expression for the gravity constant G in terms of electrostatic parameters. Applied to interaction between two separated sub-atomic particles in open space, the derivation of G results in a value that falls within the range o...

2017
P. VIDHYA V. SATHYANARAYANAMOORTHI V. KANNAPPAN

Oxindole derivatives which are commercially available have got antiviral, antifungal, antibacterial, anticancer, anti-inflammatory, antihypertensive, and anticonvulsant activities. The solvation analysis of oxindole derivatives has been carried out using B3LYP procedure with 6-311++G basis set using ten solvents to compute the electrostatic interaction, repulsive, dispersive energy and cavitati...

Journal: :Physical chemistry chemical physics : PCCP 2009
Cao Li Jing Zhang Shuo Yang Bo-Lan Li Yong-Yong Li Xian-Zheng Zhang Ren-Xi Zhuo

Layer-by-layer (LbL) assembly of chitosan-graft-phenyl (CHI-g-Ph) and poly(aspartic-graft-octadecyl) chain (PASP-g-OD) with multiple interactions, i.e. electrostatic interaction and hydrophobic interaction, was studied and the growth rate of multilayered films was found to be strongly dependent on the concentration of NaCl in the aqueous solution. LbL assembly of phenyl chitosan-graft-cyclodext...

Journal: :Genetics and molecular research : GMR 2007
W Rocchia G Neshich

STING and Java Protein Dossier provide a collection of physical-chemical parameters, describing protein structure, stability, function, and interaction, considered one of the most comprehensive among the available protein databases of similar type. Particular attention in STING is paid to the electrostatic potential. It makes use of DelPhi, a well-known tool that calculates this physical-chemic...

2014
Paolo Mereghetti Michael Martinez Rebecca C Wade

BACKGROUND Brownian dynamics (BD) simulations can be used to study very large molecular systems, such as models of the intracellular environment, using atomic-detail structures. Such simulations require strategies to contain the computational costs, especially for the computation of interaction forces and energies. A common approach is to compute interaction forces between macromolecules by pre...

Journal: :Chemistry 2006
James D Crowley Ian M Steele Brice Bosnich

Ferrocene has been investigated as a platform for developing protonmotive electrostatic drivers for molecular motors. When two 3-pyridine groups are substituted to the (rapidly rotating) cyclopentadienyl (Cp) rings of ferrocene, one on each Cp, it is shown that the (Cp) eclipsed, pi-stacked rotameric conformation is preferred both in solution and in the solid state. Upon quaternization of both ...

Journal: :Physical review letters 2005
Jordi Faraudo Fernando Bresme

We study the electrostatic interaction between two ionic surfactant layers by performing molecular dynamic simulations of salt-free thin water films coated by surfactants (Newton black films). We find a strong exponentially decaying short-range repulsion not explained by classical Poisson-Boltzmann theory. This electrostatic force is shown to be mainly due to the anomalous dielectric response o...

Journal: :Langmuir : the ACS journal of surfaces and colloids 2014
James Kurniawan Nai-Ning Yin Gang-yu Liu Tonya L Kuhl

Interaction force-distance profiles between substrate-supported membranes composed of equimolar ternary mixtures of unsaturated phosphotidylcholine (PC) lipid, saturated PC lipid, and cholesterol were determined using the surface force apparatus. Both double and single unsaturated PC lipids were studied. In all cases, the membranes were slightly negatively charged, resulting in a weak, long-ran...

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