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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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.
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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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How Homogeneous Are “Homogeneous Dispersions”? Counterion-Mediated Attraction between Like-Charged Species†
TL;DR: In this article, the lattice constant and direction of a single bcc crystal were determined for a homogeneous dispersion of ionic latex particles in a confocal laser scanning microscope (CLSM) image.
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Coalescence of phospholipid membranes as a possible origin of anticoagulant effect of serum proteins.
Jasna Urbanija,Nejc Tomšič,Maruša Lokar,A Ambrozic,Saša Čučnik,Blaz Rozman,Maša Kandušer,Aleš Iglič,Veronika Kralj-Iglič +8 more
TL;DR: A (new) possible anticoagulant mechanism for some serum proteins is proposed by preventing the release of prothrombogenic microexovesicles into circulation by the presence of anti-beta2GPIs.
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Surface forces mediated by charged polymers: Effects of intrinsic chain stiffness
TL;DR: Comparisons with predictions by a correlation-corrected polyelectrolyte Poisson-Boltzmann theory are made, and the quantitative agreement is satisfactory.
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Direct observation of cations and polynucleotides explains polyion adsorption to like-charged surfaces.
TL;DR: X-ray standing waves generated by Bragg diffraction from a d = 20 nm Si/Mo multilayer substrate are used to measure the distinct distribution profiles of the polyanions and simple cations along the surface normal direction with subnanometer resolution.
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Orientation of multivalent ions near charged planar surfaces
TL;DR: In this paper, a simple three-state model for the orientation of the multivalent ions in the gradient of an electric field and applying the methods of statistical physics was used to show that the internal charge distribution within a single multivalent ion with the charges located at well-separated positions may lead to the orientational ordering of multi-ivalent ions near the charged planar surface.