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
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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.
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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.
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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.
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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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Journal ArticleDOI
Dipolar Poisson-Boltzmann equation: ions and dipoles close to charge interfaces.
TL;DR: An extension to the Poisson-Boltzmann model where the dipolar features of solvent molecules are taken explicitly into account is presented and can be extended to any order in a systematic expansion.
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Simulations of counterions at charged plates
A.G. Moreira,Roland R. Netz +1 more
TL;DR: The counterion density profile is obtained and compared with both the Poisson-Boltzmann theory and the strong-coupling theory and with previously calculated correction terms to both theories for different values of the coupling parameter, establishing the domain of validity of the asymptotic limits.
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Direct Observation of Charge Inversion by Multivalent Ions as a Universal Electrostatic Phenomenon
TL;DR: The observed reversal of the polarity of charged surfaces in water upon the addition of trivalent and quadrivalent ions using atomic force microscopy supports the theoretical proposal that spatial correlations between ions are the driving mechanism behind charge inversion.
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Double-layer ion correlation forces restrict calcium-clay swelling
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Electric double layer forces in the presence of polyelectrolytes
TL;DR: In this paper, an electric double layer is studied by means of Monte Carlo simulations and mean field theory, and the counterions of the uniformly charged surfaces are modeled as flexible polyelectrolytes.