A5018971401- Mesoporous Materials and Catalysis
- Phase Equilibria and Thermodynamics
- Hydrocarbon exploration and reservoir analysis
- Membrane Separation and Gas Transport
- Nuclear Physics and Applications
- Ionic liquids properties and applications
- Magnetic and transport properties of perovskites and related materials
- Theoretical and Computational Physics
- High-pressure geophysics and materials
- Enhanced Oil Recovery Techniques
- Membrane Separation Technologies
- Material Dynamics and Properties
- Zeolite Catalysis and Synthesis
- Graphene research and applications
- CO2 Sequestration and Geologic Interactions
- Catalysis and Oxidation Reactions
- NMR spectroscopy and applications
- Advancements in Transdermal Drug Delivery
- Clay minerals and soil interactions
- Aerogels and thermal insulation
- Nuclear Materials and Properties
- Covalent Organic Framework Applications
- Graphite, nuclear technology, radiation studies
- Heat and Mass Transfer in Porous Media
- Adsorption, diffusion, and thermodynamic properties of materials
National Centre of Scientific Research "Demokritos"
2012-2024
University of Ioannina
2010
University of Salford
1994-1999
Supported ionic liquid phase (SILP) systems were prepared by immobilizing a methylimidazolium cation based onto the pore surface of two types support, MCM-41 and Vycor. The "grafting to" method was applied, involving (3-chloropropyl)-trialkoxysilane anchoring on supports' silanol groups, followed treatment with 1-methylimidazole ion exchange PF(6)(-). Optimum pretreatment procedures reaction conditions for enhanced (IL) loading properly defined applied all modifications. A study effect...
Shale is an increasingly viable source of natural gas and a potential candidate for geologic CO2 sequestration. Understanding the adsorption behavior on shale necessary design optimal recovery sequestration projects. In present study neutron diffraction small-angle scattering measurements adsorbed in Marcellus samples were conducted Near InterMediate Range Order Diffractometer (NIMROD) at ISIS Pulsed Neutron Muon Source, STFC Rutherford Appleton Laboratory along isotherm 22 °C pressures 25...
This work examines important physicochemical and thermophysical properties of ultrathin ionic liquid (IL) layers under confinement into the pore structure siliceous supports brings significant advances toward understanding effects these on gas separation catalytic performance developed supported phase (SILP) solid catalysts with (SCILL). SILPs were by making use functionalized nonfunctionalized ILs, such as 1-(silylpropyl)-3-methyl-imidazolium hexafluorophosphate 1-butyl-3-methyl-imidazolium...
Small-angle neutron scattering (SANS), contrast-matching SANS, and nitrogen adsorption have been utilized to investigate the confined ionic liquid (IL) [bmim][PF6] phase in ordered mesoporous silica MCM-41 SBA-15. The results suggest that pores of SBA-15 are completely filled with IL whereas a small fraction pore volume, "core", is empty. SANS measurements confirm enhanced solubility water IL. In addition, they provide strong evidence does not enter empty core MCM-41, possibly because...
Small-angle neutron scattering (SANS) has been used to study the adsorption and desorption behavior of a ${\mathrm{D}}_{2}$O/${\mathrm{H}}_{2}$O water mixture in porous materials. When solid is partially saturated, feature appears having fractal-like power-law form ${\mathit{Q}}^{\mathrm{\ensuremath{-}}\mathit{D}}$ (where Q wave vector) very-low-Q region, extending below limit instruments which covers maximum range about one one-half orders magnitude Q. The gradient measured during D, being...
The behavior of molecules confined in a nanoporous material was studied by adsorption from the gas phase with situ neutron diffraction, aid high-pressure apparatus and General Materials diffractometer (GEM, ISIS). aim this work is to establish combined adsorption/neutron diffraction technique as unique tool elucidate both mechanism structure materials. For reason, well-defined mesoporous system (MCM-41) selected adsorbent carbon dioxide adsorbate, while measurements have been carried out...
We study sorption and transport processes in dry wet (preadsorbed with CH2Br2) Vycor glass by combining small angle scattering three-dimensional (3D) stochastic reconstruction methods. Three-phase systems of solid, condensate, void space, are generated for the first time, combination above The resulting 3D images can visualize evolution adsorption process show how alters pore space characteristics material. Desorption is modeled this system additional employment an invasion percolation...
The magnetic properties together with the crystal and structures of cobaltites La(1-x)Ba(x)CoO(3) (for x = 0.2 0.3) are determined by DC magnetization, AC susceptibility neutron powder diffraction measurements over a broad spectrum temperatures. For 0.3 rhombohedral structure space group [Formula: see text] is maintained at all temperatures below 300 K. On other hand, for refinement data 150 K indicates coexistence two structures, (rhombohedral) Pbnm (orthorhombic), respectively, in ratio...
ABSTRACT Fabrication, morphology evaluation , and permeance/selectivity properties of three asymmetric BTDA‐TDI/MDI copolyimide hollow fiber membranes (HFM s ) are reported. The HFM were spun using the dry/wet phase inversion process. effect one major spinning parameters, air gap, on produced was investigated. Scanning e lectron m icroscopy used to evaluate morphological characteristics macroscopic structure developed HFM. permeance values He, H 2 CH 4 CO O N gases measured by variable...
In situ neutron diffraction measurements of adsorbed carbon dioxide in an ordered mesoporous silica (MCM-41) have been carried out along isotherm slightly above the critical point (308 K) and at a range pressures below one (30-125 bar). The experiment has performed with aid novel high-pressure adsorption apparatus GEM diffractometer (ISIS, Rutherford Appleton Laboratory, UK). Diffraction both bulk supercritical liquid also out. structure factors total differential correlation functions...
Abstract Vycor porous glass has long served as a model mesoporous material. During the physical adsorption of halogenated hydrocarbon vapours, such dibromomethane, isotherm exhibits an hysteresis loop; gradual ascent is observed at higher pressures during and sharp drop lower desorption. For fully wetting fluids, early hypothesis attributed to mechanistic differences between capillary condensation (adsorption) evaporation (desorption) processes occurring in wide bodies narrow necks,...
Neutron scattering experiments indicate that CO${}_{2}$ confined in nanopores does not freeze when cooled below the triple point but instead vacates pores and solidifies bulk. Upon reheating refills nanopores.