Browsing by Author "Leontidis, Epameinondas"
Now showing items 1-20 of 61
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Amphiphilic Polymer Conetworks Based on End-Linked "core-First" Star Block Copolymers: Structure Formation with Long-Range Order
Kepola, Eleni J.; Loizou, Elena; Patrickios, Costas S.; Leontidis, Epameinondas; Voutouri, Chrysovalantis; Stylianopoulos, Triantafyllos; Schweins, R.; Gradzielski, M.; Krumm, C.; Tiller, J. C.; Kushnir, M.; Wesdemiotis, Chrystostomos (2015)Amphiphilic polymer conetworks are cross-linked polymers that swell both in water and in organic solvents and can phase separate on the nanoscale in the bulk or in selective solvents. To date, however, this phase separation ...
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Attraction of iodide ions by the free water surface, revealed by simulations with a polarizable force field based on drude oscillators
Archontis, Georgios Z.; Leontidis, Epameinondas; Andreou, Georgia (2005)Recent theoretical and experimental studies have shown that polarizable anions, such as iodide and bromide, preferentially accumulate close to the surface of electrolyte solutions. This finding is in sharp contrast to the ...
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Bis(hydroxylamino)triazines: High Selectivity and Hydrolytic Stability of Hydroxylamine-Based Ligands for Uranyl Compared to Vanadium(V) and Iron(III)
Hadjithoma, Sofia; Papanikolaou, Michael G.; Leontidis, Epameinondas; Kabanos, Themistoklis A.; Keramidas, Anastasios D. (2018)The development of ligands with high selectivity and affinity for uranium is critical in the extraction of uranium from human body, radioactive waste, and seawater. A scientific challenge is the improvement of the selectivity ...
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Bound states in a nonlinear Kronig-Penney model
Theodorakis, Stavros; Leontidis, Epameinondas (1997)We study the bound states of a Kronig Penney potential for a nonlinear one-dimensional Schrödinger equation. This potential consists of a large, but not necessarily infinite, number of equidistant δ-function wells. We show ...
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Bound states in a nonlinear Kronig-Penney model
Theodorakis, Stavros; Leontidis, Epameinondas (1997)We study the bound states of a Kronig Penney potential for a nonlinear one-dimensional Schrödinger equation. This potential consists of a large, but not necessarily infinite, number of equidistant δ-function wells. We show ...
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Can we use area per surfactant as a quantitative test model of specific ion effects?
Zemb, Th; Belloni, L.; Dubois, M.; Aroti, Andria; Leontidis, Epameinondas (2004)The three main currently proposed approaches for understanding specific ion effects are briefly described. In some experimentally well defined and simplified situations, one can decouple ion specificity effects from all ...
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Chaotropic salts interacting with soft matter: Beyond the lyotropic series
Leontidis, Epameinondas (2016)The effects of the chaotropic ions of the Hofmeister series on many systems and phenomena are typically quite pronounced. What happens, however, when one uses chaotropic ions beyond SCN−, ClO4 −, or guanidinium, which are ...
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Composite nanotubes formed by self-assembly of PbS nanoparticles
Leontidis, Epameinondas; Orphanou, M.; Kyprianidou-Leodidou, Tasoula; Krumeich, F.; Caseri, Walter (2003)Unusual arrangements of nanoparticles were observed during the synthesis and subsequent dissolution of PbS particles under the action of the surfactant sodium dodecyl sulfate (SDS) in solutions containing hydrophilic ...
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Controlled production of ZnO nanoparticles from zinc glycerolate in a sol-gel silica matrix
Moleski, R.; Leontidis, Epameinondas; Krumeich, F. (2006)The controlled production of ZnO nanoparticles within an amorphous silica matrix is achieved using a new methodology consisting of four stages. First, precursor zinc glycerolate nanoparticles are produced within reversed ...
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A critical evaluation of novel algorithms for the off-lattice Monte Carlo simulation of condensed polymer phases
Leontidis, Epameinondas; De Pablo, J. J.; Laso, M.; Suter, U. W. (1994)Novel composite algorithms for efficient off-lattice simulations of dense polymer phases are implemented and evaluated in the case of polyethylene in the united and explicit atom approximations. The simulation algorithms ...
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Dissecting the stabilization of iodide at the air-water interface into components: A free energy analysis
Archontis, Georgios Z.; Leontidis, Epameinondas (2006)Recent experiments and simulations show that large chaotropic anions favor solvation at the water surface, mainly due to induction interactions dominated by ionic polarizabilities. We compare the solvation free-energy ...
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Double Networks Based on Amphiphilic Cross-Linked Star Block Copolymer First Conetworks and Randomly Cross-Linked Hydrophilic Second Networks
Rikkou-Kalourkoti, Maria D.; Kitiri, E. N.; Patrickios, Costas S.; Leontidis, Epameinondas; Constantinou, Martha; Constantinides, G.; Zhang, X. K.; Papadakis, Christine M. (2016)This study presents the preparation and characterization of double networks (DN) based on a first amphiphilic polymethacrylate conetwork (APCN) and a second polyacrylamide network. The APCN first network comprised ...
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Effects of hofmeister anions on DPPC langmuir monolayers at the air-water interface
Aroti, Andria; Leontidis, Epameinondas; Maltseva, E.; Brezesinski, G. (2004)In this work we investigated the effect of sodium salts of different monovalent anions belonging to the Hofmeister series on Langmuir monolayers of DPPC (1,2-dipalmitoyl phosphatidylcholine). The salts used were NaCl, NaBr, ...
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Effects of monovalent anions of the Hofmeister series on DPPC lipid bilayers part I: Swelling and in-plane equations of state
Aroti, Andria; Leontidis, Epameinondas; Dubois, M.; Zemby, T. (2007)Aiming to improve understanding of the mechanisms behind specific anion effects in biological systems we have studied the effects of sodium salts of simple monovalent anions belonging to the Hofmeister series on the bilayers ...
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Effects of monovalent anions of the Hofmeister series on DPPC lipid bilayers part II: Modeling the perpendicular and lateral equation-of-state
Leontidis, Epameinondas; Aroti, Andria; Belloni, L.; Dubois, M.; Zemby, T. (2007)The effects of Hofmeister anions on the perpendicular and lateral equation-of-state (EOS) of the dipalmitoylphosphatidylcholine lamellar phase discussed in the companion article are here examined using appropriate free ...
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Effects of sodium salts of lyotropic anions on low-temperature, ordered lipid monolayers
Christoforou, Maria; Leontidis, Epameinondas; Brezesinski, G. (2012)Electrolytes are known to impart considerable disorder to lipid assemblies, including monolayers at the air-water interface, bilayers, and vesicles. In the present work, we have investigated the disordering effect of sodium ...
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Equilibrium in soft-matter systems under the influence of competing forces
Zemb, T.; Leontidis, Epameinondas (2013)
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Equilibrium in soft-matter systems under the influence of competing forces: Part II
Zemb, T.; Leontidis, Epameinondas (2014)
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Formation mechanism of nanotubes comprising layers of PbS nanoparticles in polymer-surfactant solutions
Orphanou, M.; Leontidis, Epameinondas; Kyprianidou-Leodidou, Tasoula; Caseri, Walter; Krumeich, F.; Kyriacou, Kyriacos C. (2006)The crystallization of PbS in aqueous solutions containing the surfactant sodium dodecyl sulfate (SDS) and hydrophilic polymers resulted in a novel type of metastable nanotubes, the walls of which consist of layers of ...
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From beads-on-a-string to colloidal aggregation: novel crystallization phenomena in the PEO-SDS system
Leontidis, Epameinondas; Kyprianidou-Leodidou, Tasoula; Caseri, Walter; Kyriacou, Kyriacos C. (1999)The anionic surfactant sodium dodecyl sulfate (SDS) interacts strongly with poly(ethylene oxide) (PEO) in aqueous solution, forming micellar aggregates attached to the polymer chains above the so-called critical association ...