A5077409466- Spectroscopy and Quantum Chemical Studies
- Surfactants and Colloidal Systems
- Lipid Membrane Structure and Behavior
- Crystallization and Solubility Studies
- Photochemistry and Electron Transfer Studies
- Electrostatics and Colloid Interactions
- X-ray Diffraction in Crystallography
- Material Dynamics and Properties
- Molecular spectroscopy and chirality
- Polymer Surface Interaction Studies
- Quantum Dots Synthesis And Properties
- Thermodynamic properties of mixtures
- Chemical and Physical Properties in Aqueous Solutions
- Molecular Junctions and Nanostructures
- Advanced Polymer Synthesis and Characterization
- ZnO doping and properties
- Electrochemical Analysis and Applications
- Protein Structure and Dynamics
- Theoretical and Computational Physics
- Radioactive element chemistry and processing
- Chalcogenide Semiconductor Thin Films
- Mesoporous Materials and Catalysis
- Block Copolymer Self-Assembly
- Polymer crystallization and properties
- Covalent Organic Framework Applications
University of Cyprus
2012-2024
Institut de Chimie Séparative de Marcoule
2014
Max Planck Institute of Colloids and Interfaces
2004-2009
University of Crete
2005
Cyprus Institute of Neurology and Genetics
1999-2004
University of Patras
2002-2004
Foundation for Research and Technology Hellas
2004
ETH Zurich
1994-2003
École Polytechnique Fédérale de Lausanne
2000
In this work we investigated the effect of sodium salts different monovalent anions belonging to Hofmeister series on Langmuir monolayers DPPC (1,2-dipalmitoyl phosphatidylcholine). The used were NaCl, NaBr, NaNO3, NaI, NaBF4, NaClO4, and NaSCN. monolayer phase behavior morphology structure lipid phases studied by surface pressure−area isotherms, Brewster Angle Microscopy (BAM), Grazing Incidence X-ray Diffraction (GIXD), Infrared Reflection−Absorption Spectroscopy (IRRAS). presence...
Amphiphilic polymer conetworks are cross-linked polymers that swell both in water and organic solvents can phase separate on the nanoscale bulk or selective solvents. To date, however, this separation has only been reported with short-range order, characterized by disordered morphologies. We now report first example of amphiphilic conetworks, based end-linked "core-first" star block copolymers, form a lamellar long-range order. These mesoscopically ordered systems be produced simple fashion...
The mechanism of formation gold particles by reduction AuIII in solutions alcyltrimethylammonium chloride surfactants was studied the absence and presence NaCl. anions interact strongly with trimethylammonium cations forming insoluble ion pairs (Torigoe et al. Langmuir 1992, 8, 59). Above surfactant critical micelle concentration, are solubilized micelles returning to solution. Gold were produced photochemical clear micellar solutions. coupling between aggregation inorganic crystallization...
Unusual arrangements of nanoparticles were observed during the synthesis and subsequent dissolution PbS particles under action surfactant sodium dodecyl sulfate (SDS) in solutions containing hydrophilic polymers. At selected polymer concentrations, forms insoluble lead salt (Pb(DS)2), which competes with formation particles. Under form bending self-assembled layers; a novel type metastable nanotubes arises then, walls consist layers ordered are, most likely, separated by bilayers molecules.
In this work, we use Langmuir monolayers of dipalmitoyl phosphatidylcholine (DPPC) as model systems to enhance the understanding specific anion effects in physicochemical and biological systems. The 298 K isotherms (equation state, EOS) DPPC over solutions a range sodium salts depend strongly on type concentration salt subphase. We focus particular liquid expanded phase region EOS assume that deviation electrolyte from pure water is due entirely charging lipid monolayer by ions. then examine...
Recent theoretical and experimental studies have shown that polarizable anions, such as iodide bromide, preferentially accumulate close to the surface of electrolyte solutions. This finding is in sharp contrast previously prevailing idea salts are dielectrically excluded from free water opens up new avenues for research specific salt effects. In this work, we verified ability a recently introduced model, SWM4-DP, reproduce behavior, by simulations NaI/water slab, corresponding 1.2 M...
In the preceding paper of this series [ Leontidis , E. ; Aroti A. Belloni L. J. Phys. Chem. B 2009 113 1447 ], we considered and modeled increase surface pressure dipalmitoyl phosphatidylcholine (DPPC) monolayers over electrolyte solutions various monovalent sodium salts. The experimental results for salts with large, less hydrophilic anions can be successfully described by models treating ionic specificity either as specific partitioning in interfacial lipid layer or a result ion-lipid...
Thiocyanate (SCN−) is a highly chaotropic anion of considerable biological significance, which interacts quite strongly with lipid interfaces. In most cases it not exactly known if this interaction involves direct binding to groups, or some type indirect association partitioning. Since thiocyanate linear ion, dipole moment and nonspherical polarizability tensor, one should also consider its capability adopt different preferential orientations at the present work, anions zwitterionic...
This study presents the preparation and characterization of double networks (DN) based on a first amphiphilic polymethacrylate conetwork (APCN) second polyacrylamide network. The APCN network comprised interconnected "in–out" star copolymers 2-(dimethylamino)ethyl methacrylate (DMAEMA, hydrophilic ionizable monomer) 2-ethylhexyl (EHMA, hydrophobic comonomer) or lauryl (LauMA, comonomer), synthesized using group transfer polymerization, following one-pot, sequential, monomer, cross-linker...
Significant progress has been made recently in the field of atomistic simulation polymer melts through advent new powerful Monte Carlo methods. This article reviews state art area. Sampling configurational space a dense system is difficult, because complications introduced by high density and connectivity chain molecules. We describe how some novel algorithms attempt to solve problem, compare them using set stringent performance criteria discuss their strengths weaknesses, successes...
A series of seven dynamic covalent networks based on pentaerythritol tetra(benzohydrazide) and 1,10‐decanediol dibenzaldehyde were prepared in N , ‐dimethylformamide ( DMF ). The equilibrium degree swelling the sol fraction displayed a minimum at or near hydrazide–benzaldehyde stoichiometric ratio. composition changed according to feed composition, with dibenzaldehyde‐rich preparations exhibiting extractables composed star oligomers cores. Finally, network reversibility self‐healing...
Electrolytes are known to impart considerable disorder lipid assemblies, including monolayers at the air–water interface, bilayers, and vesicles. In present work, we have investigated disordering effect of sodium salts monovalent anions that span lyotropic series on 1,2-dipalmitoyl-sn-glycero-phosphocholine (DPPC) 12 °C. Pressure–area isotherms, Brewster-angle microscopy (BAM), grazing-incidence X-ray diffraction (GIXD), infrared absorption–reflection spectroscopy (IRRAS) were used...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Mechanism of Spectral Shift and Inhomogeneous Broadening an Aromatic Chromophore in a Polymer GlassEpameinondas Leontidis, Ulrich W. Suter, Martin Schuetz, Hans-Peter Luethi, Alois Renn, Urs P. WildCite this: J. Am. Chem. Soc. 1995, 117, 28, 7493–7507Publication Date (Print):July 1, 1995Publication History Published online1 May 2002Published inissue 1 July...
In this work, we examine the rich crystallization behavior that occurs in PbII/S-II/poly(ethylene oxide) (PEO)/sodium dodecyl sulfate (SDS) systems, which anionic surfactant interacts strongly with polymer molecules, forming micellar aggregates attached to chains above critical association concentration. Lead sulfide crystallites are formed vicinity of polymer-bound micelles by adding lead and ions polymer−surfactant solution. Surfactant-stabilized inorganic particles adsorbed on combine...