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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Ions and water molecules in an electrolyte solution in contact with charged and dipolar surfaces
Ekaterina Gongadze,Aljaž Velikonja,Šárka Perutková,Peter Kramar,Alenka Maček-Lebar,Veronika Kralj-Iglič,Aleš Iglič +6 more
TL;DR: In this article, the Langevin-Poisson-Boltzmann (LPB) and Langevin -Bikerman (LBP) models were used to model the electrolyte-charged surface interface and the space dependence of relative permittivity.
Journal ArticleDOI
Pore-free matrix with cooperative chelating of hyperbranched ligands for high-performance separation of uranium.
Yang Li,Lei Wang,Bo Li,Meicheng Zhang,Rui Wen,Xinghua Guo,Xing Li,Ji Zhang,Shoujian Li,Lijian Ma +9 more
TL;DR: The experimental results demonstrate that the proposed pore-free, amidoxime-terminated hyperbranched nanodiamond (ND-AO) could provide an optional approach for the design and fabrication of other new high-performance sorbing materials with prospective applications in selective separation of other interested metal ions.
Journal ArticleDOI
Generalized stern models of the electric double layer considering the spatial variation of permittvity and finite size of ions in saturation regime.
TL;DR: The present mini review is focused on introducing the generalized Stern theory of an EDL, which takes into account the orientational ordering of water molecules, and introduces two Langevin models for spatial variation of the relative permittivity for point-like and finite sized ions.
Journal ArticleDOI
Adhesion of osteoblasts to a vertically aligned TiO2 nanotube surface.
TL;DR: It is shown that adhesion and spreading of osteoblasts on vertically aligned TiO2 nanotube surfaces depend on the diameter of the nanotubes, which apparently has on average more sharp convex edges per unit area than a large one, leading to stronger binding affinity on its surface.
Journal ArticleDOI
Mechanisms for the formation of membranous nanostructures in cell-to-cell communication
Karin Schara,Karin Schara,Vid Janša,Vid Šuštar,Drago Dolinar,Drago Dolinar,J.I. Pavlic,Maruša Lokar,Veronika Kralj-Iglič,Peter Veranič,Aleš Iglič +10 more
TL;DR: Two physical mechanisms involved in the formation of microvesicles and nanotubes are described: curvature-mediated lateral redistribution of membrane components with the formationof membrane nanodomains; and plasmamediated attractive forces between membranes.
References
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TL;DR: The forces between atoms and molecules are discussed in detail in this article, including the van der Waals forces between surfaces, and the forces between particles and surfaces, as well as their interactions with other forces.
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