A5047917357- Membrane Separation and Gas Transport
- Membrane Separation Technologies
- Graphene research and applications
- Ionic liquids properties and applications
- Muon and positron interactions and applications
- Carbon Dioxide Capture Technologies
- Membrane-based Ion Separation Techniques
- Advanced Welding Techniques Analysis
- Fuel Cells and Related Materials
- Catalysts for Methane Reforming
- Synthesis and properties of polymers
- Aluminum Alloys Composites Properties
- Aluminum Alloy Microstructure Properties
- Carbon dioxide utilization in catalysis
- Catalytic Processes in Materials Science
- Concrete Corrosion and Durability
- Covalent Organic Framework Applications
- Carbon Nanotubes in Composites
- Chemical Synthesis and Reactions
- Advancements in Battery Materials
- Electrocatalysts for Energy Conversion
- Block Copolymer Self-Assembly
- Dielectric materials and actuators
- Superconducting Materials and Applications
- Electrochemical Analysis and Applications
National Centre of Scientific Research "Demokritos"
2015-2024
University of the Aegean
2023
Carbonized cellulose -based hollow fiber membranes were prepared by dry-wet spinning phase inversion method, followed carbonization and evaluated in terms of gas separation performance for CO2/N2 CO2/CH4 mixtures, under flow conditions. Permeability real selectivity measured both mentioned a temperature range 25 °C to 60 °C, differential pressure 8 bar(a) 20 CO2 concentration from 5% v/v 15% v/v. The highest yielding mixture values 42 at 10% CO2, & around 150 the same conditions, whereas...
Biogas is an increasingly attractive renewable resource that needs to be upgraded meet either the natural gas pipeline quality or biomethane requirement. The use of carbon membranes a promising alternative conventional separation technologies, but, up now, few attempts have been made systematically investigate their performance under real biogas upgrading conditions, for instance, presence water vapor and H2S in feed stream. In this work, first time literature, performances as-prepared...
In the present work, Pebax-1657, a commercial multiblock copolymer (poly(ether-block-amide)), consisting of 40% rigid amide (PA6) groups and 60% flexible ether (PEO) linkages, was selected as base polymer for preparing dense flat sheet mixed matrix membranes (MMMs) using solution casting method. Carbon nanofillers, specifically, raw treated (plasma oxidized) multi-walled carbon nanotubes (MWCNTs) graphene nanoplatelets (GNPs) were incorporated into polymeric in order to improve...
Abstract Three different types of carbon nanomaterials, SWCNTs, MWCNTs and GNPs were prepared, modified, characterized, their dispersibility behavior in three solvents was evaluated. The nanotubes synthesized by using the well-known chemical vapor deposition method graphene nanoplatelets wet physicochemical treatment techniques. Their characterization accomplished various advanced techniques, such as powder X-ray diffraction Raman spectroscopy, photoelectron scanning electron microscopy N 2...
Based on its low cost and water adsorption capacity, compared to synthetic zeolites (A-type, X-type Y-type), natural, untreated clinoptilolite was examined as a potential adsorbent for separation process targeting removal of CO2 from flue gas. Taking into consideration typical gas composition temperature, adsorptive properties binary CO2/N2 mixtures were tested in the temperature range 268 403 K with literature data. The results showed that concentration, total pressure, strongly affect...
This investigation explores the potential of electrochemical impedance spectroscopy (EIS) in evaluating graphene-based cementitious nanocomposites, focusing on their physical and structural properties, i.e., electrical resistivity, porosity, fracture toughness. EIS was employed to study cement mixtures with varying graphene nanoplatelet (xGnP) concentrations (0.05-0.40% per dry weight), whereas flexural tests assessed toughness porosimetry analyses investigated characteristics. The research...
This work reports on the astonishing high capacity of inverse supported ionic liquid absorbents, hereinafter denoted as "inverse SILPs" to remove acidic gases (SO2 and CO2) from flue gas streams. These nonconventional SILPs are easily prepared in form flowing powder via a phase inversion technique consist tiny (IL) droplets enclosed into an ultrathin, porous solid sleeve pyrogenic silica nanoparticles. The CO2/N2 SO2/CO2 separation performance regeneration efficiency developed six different...
In this work, the successful fabrication of polymeric hollow fiber (HF) and flat sheet (FS) membranes was examined by employing γ-butyrolactone (GBL)-a green environmentally friendly solvent- for polymer's dissolution following principles chemistry sustainability regarding membrane preparation. addition, ternary phase diagram P84/GBL/water constructed viscosity dope solution measured different concentrations temperatures. Their morphological characteristics prepared polyimide were...
The main scope of this work is to develop nano-carbon-based mixed matrix cellulose acetate membranes (MMMs) for the potential use in both gas and liquid separation processes. For purpose, a variety membranes, consisting (CA) polymer carbon nanotubes as additive material were prepared, characterized, tested. Multi-walled (MWCNTs) used filler diacetone alcohol (DAA) solvent. first objective towards highly efficient composite was proper preparation agglomerate-free MWCNTs dispersions....
Aligned with the recent trend and imperative to reduce separation layer thickness in gas membranes nanometer scale order raise permeance levels that can render them competitive respect other technologies, a novel approach device for fabricating defect-free composite hollow fiber (HF) by dip-coating is described. The presented method avoids fundamental drawbacks of state-of-the-art techniques applying thin onto porous HF substrate, providing safe but, at same time, easily up-scalable way...
Molecular dynamics simulations were applied to investigate the formation of P84 polyimide membranes through non-solvent induced phase separation (NIPS) process, considering two scenarios: one using a conventional organic solvent like n-methyl-2-pyrrolidone (NMP) and other greener alternative, γ-butyrolactone (GBL), with water serving as non-solvent. Different compositions polymer solutions established along binodal boundaries respective systems, derived from experimental cloud point data on...
A novel and innovative method was developed to fabricate defect-free composite hollow fiber (HF) membranes using drop-casting under continuous flow. The synthesized Pebax-1657—based were examined for gas separation processes, focusing on the of CO2 from CH4 CO gases. performance rigorously assessed realistic binary mixture conditions evaluate their selectivity performance. effect pressure systematically investigated, with transmembrane pressures up 10 bar being applied at a temperature 298...
Biomass gasification is a viable solution for generating H2; however, the syngas produced must be upgraded to make H2-containing streams suitable other applications, such as renewable methanol production, by adjusting H2/CO ratio. In this study, first time in literature, separation properties of carbon hollow fiber membranes binary and quaternary mixtures with varying compositions were systematically explored. It was found that developed exhibit relatively good selectivity (H2+CO2) gases N2...
In this work, supported cellulose acetate (CA) mixed matrix membranes (MMMs) were prepared and studied concerning their gas separation behaviors. The dispersion of carbon nanotube fillers as a factor polymer filler concentrations using the mixing methods rotor-stator system (RS) three-roll-mill (TRM). Compared to quality achieved by RS, samples TRM seem have slightly bigger, but fewer more homogenously distributed, agglomerates. green γ-butyrolactone (GBL) was chosen polyimide (PI)...