Journal ArticleDOI
Attraction between negatively charged surfaces mediated by spherical counterions with quadrupolar charge distribution
Jasna Urbanija,Klemen Bohinc,Alfredo Bellen,Stefano Maset,Aleš Iglič,Veronika Kralj-Iglič,P. B. Sunil Kumar +6 more
TLDR
For high enough charge densities of the interacting surfaces and large enough l, the interaction between surfaces turns repulsive as the distance between charges is reduced, and within a mean field approach an attractive interaction between like-charged surfaces originating from orientational ordering of quadrupolar counterions is obtained.Abstract:
We observed monoclonal antibody mediated coalescence of negatively charged giant unilamellar phospholipid vesicles upon close approach of the vesicles. This feature is described, using a mean field density functional theory and Monte Carlo simulations, as that of two interacting flat electrical double layers. Antibodies are considered as spherical counterions of finite dimensions with two equal effective charges spatially separated by a fixed distance l inside it. We calculate the equilibrium configuration of the system by minimizing the free energy. The results obtained by solving the integrodifferential equation and by performing the Monte Carlo simulation are in excellent agreement. For high enough charge densities of the interacting surfaces and large enough l, we obtain within a mean field approach an attractive interaction between like-charged surfaces originating from orientational ordering of quadrupolar counterions. As expected, the interaction between surfaces turns repulsive as the distance between charges is reduced.read more
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Titanium nanostructures for biomedical applications
Mukta Kulkarni,Anca Mazare,Ekaterina Gongadze,Šárka Perutková,Veronika Kralj-Iglič,Ingrid Milošev,Patrik Schmuki,Aleš Iglič,Miran Mozetič +8 more
TL;DR: Perhaps the most spectacular and surprising one-dimensional structures and their unique biomedical applications for increased osseointegration, protein interaction and antibacterial properties are focused on.
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Adhesion of osteoblasts to a nanorough titanium implant surface
Ekaterina Gongadze,Doron Kabaso,Sebastian Bauer,Tomaž Slivnik,Patrik Schmuki,Ursula van Rienen,Aleš Iglič +6 more
TL;DR: It is suggested that osteoblasts are most strongly bound along the sharp convex edges or spikes of nanorough titanium surfaces where the magnitude of the negative surface charge density is the highest and it is plausible that nanorough regions of titanium surfaces with sharp edges and spikes promote the adhesion of osteoblast.
Journal ArticleDOI
Excluded volume effect and orientational ordering near charged surface in solution of ions and Langevin dipoles.
TL;DR: The influence of a finite volume of ions and orientational ordering of water Langevin dipoles on the dielectric permittivity profile in the vicinity of charged surface is studied theoretically via a numerical solution of the modified Poisson-Boltzmann equation.
Journal ArticleDOI
Mechanics and electrostatics of the interactions between osteoblasts and titanium surface.
Doron Kabaso,Ekaterina Gongadze,Šárka Perutková,Claudia Matschegewski,Veronika Kralj-Iglič,Ulrich Beck,U. van Rienen,Aleš Iglič +7 more
TL;DR: It is suggested that the synergy between these two processes is responsible for successful osteointegration along the titanium surface implant.
Journal ArticleDOI
Steric-effect-induced enhancement of electrical-double-layer overlapping phenomena
Siddhartha Das,Suman Chakraborty +1 more
TL;DR: It is demonstrated that nontrivial interactions between steric effect and electrical-double-layer (EDL) overlap phenomena may augment the effective extent of EDL overlap in narrow fluidic confinements to a significant extent by virtue of rendering the channel centerline potential tending to the ζ potential in a limiting sense as the stericEffect progressively intensifies.
References
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Direct Observation of Charge Inversion by Multivalent Ions as a Universal Electrostatic Phenomenon
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Free energy of closed membrane with anisotropic inclusions
TL;DR: In this paper, a phenomenological expression for the energy of the interaction between an inclusion and local curvature of the surrounding membrane is proposed, and assuming thermodynamic equilibrium, the free energy of inclusions, and the consistently related lateral and orientational distributions of the inclusions are obtained using statistical mechanical methods.
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Human beta2-glycoprotein I as an anticardiolipin cofactor determined using mutants expressed by a baculovirus system
Makoto Igarashi,Eiji Matsuura,Yoshiko Igarashi,Hisato Nagae,Kenji Ichikawa,Douglas A. Triplett,Takao Koike +6 more
TL;DR: It is concluded that monoclonal anti-CL antibodies derived from NZW x BXSB (WB) F1 mice or from patients with antiphospholipid syndrome bound directly to the domain V-deleted mutant protein (DI-IV) absorbed not only on an oxygenated but also on a plain polystyrene surface.
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Non-Abelian holonomies, charge pumping, and quantum computation with Josephson junctions.
TL;DR: It is demonstrated that a device where the non-Abelian operations are related to the adiabatic charge dynamics of the Josephson network can be applied both for adiABatic charge pumping and as an implementation of a quantum computer.
Journal ArticleDOI
Density Functional Theory of Ionic Screening: When Do Like Charges Attract?
TL;DR: In this article, a simple local density functional theory for screened interactions between macroions and apply it to electric double layers is described, incorporating the strong correlations between screening ions at high densities, and reducing to the Poisson-Boltzmann equations at low densities.