Browsing Τμήμα Χημείας / Department of Chemistry by Title
Now showing items 31-50 of 1302
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A novel QSPR model for predicting θ (lower critical solution temperature) in polymer solutions using molecular descriptors
(2007)In this study, we present a new model that has been developed for the prediction of θ, (lower critical solution temperature) using a database of 169 data points that include 12 polymers and 67 solvents. For the characterization ...
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Ab Initio Calculations of the Barriers to Rotation in 1,1-Difluoroallyl Radical and an Analysis of the Factors That Govern Rotational Barriers in Fluorinated Allylic Radicals
(1992)The energies required to rotate the CF2 and the CH2 group out of conjugation in 1,1-difluoroallyl radical have been calculated at the SD-CI/6–31G*//UHF/6–31G* level of theory. In agreement with experiment, the barrier to ...
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Ab Initio Calculations of the Relative Strengths of the π Bonds in Acetylene and Ethylene and of Their Effect on the Relative Energies of π-Bond Addition Reactions
(1991)Energies at the CI-SD/6-31G* level have been calculated for acetylene, ethylene, ethane, and the vinyl and ethyl anions, radicals, and cations (classical and hydrogen-bridged). From these energies, the differences between ...
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ABA triblock copolymer-based model networks in the bulk: Effect of the number of arms on microphase behavior
(2005)The microphase separation behavior in the strong segregation limit of model networks based on cross-linked ABA triblock copolymers in the bulk was investigated by calculating analytically the Gibbs free energies of the ...
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ABC triblock polymethacrylates: Group transfer polymerization synthesis of the ABC, ACB, and BAC topological isomers and solution characterization
(1998)ABC triblock copolymers of methyl methacrylate (MMA), (dimethylamino)-ethyl methacrylate (DMAEMA), and tetrahydropyranyl methacrylate (THPMA) consisting of 12 units of each type of monomer were synthesized by group transfer ...
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ABC Triblock Terpolymers with Orthogonally Deprotectable Blocks: Synthesis, Characterization, and Deprotection
(2015)The development and availability of new protecting groups are vital for all branches of synthetic chemistry. Equally vital is the facile and selective removal of these groups, leaving intact other protecting groups which ...
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Article
Absorption-enhanced reforming of phenol by steam over supported Fe catalysts
(2006)Supported Fe catalysts of varying support chemical composition prepared by sol-gel and incipient wetness impregnation methods were studied for the steam reforming of phenol (one of the main constituents of tar produced ...
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Abstract - A Microporous Co(II)-Based 3-D Metal Organic Framework Built from Magnetic Infinite Rod-Shaped Secondary Building Units
(2019)Abstract Invited for the cover of this issue is Anastasios Tasiopoulos from the University of Cyprus. The cover image shows photos from the southwestern Cyclades island group of the Aegean Sea, which contain a wealth of ...
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The Acid and/or Thermal Mediated Ring Contraction of 4H-1,2,6-Thiadiazines to Afford 1,2,5-Thiadiazoles
(2016)A near-quantitative acid and/or thermal mediated ring contraction of 3′,5′-diarylspiro(benzo[d][1,3]dioxole-2,4′-[1,2,6]thiadiazines) affords 3-aryl-4-(2-arylbenzo[d][1,3]dioxol-2-yl)-1,2,5-thiadiazoles. The reaction scope ...
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Acid mine drainage treatment with dunite
(2010)This paper reports the efficiency of dunite as an alternative alkalinity generating material and adsorbent for the passive treatment of acid mine drainage (AMD). The acid neutralization capacity (ANC) of dunite has been ...
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Article
Actinide Ion (Americium-241 and Uranium-232) Interaction with Hybrid Silica–Hyperbranched Poly(ethylene imine) Nanoparticles and Xerogels
(MDPI, 2023)The binding of actinide ions (Am(III) and U(VI)) in aqueous solutions by hybrid silica–hyperbranched poly(ethylene imine) nanoparticles (NPs) and xerogels (XGs) has been studied by means of batch experiments at different ...
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Activated biochar derived from cactus fibres - Preparation, characterization and application on Cu(II) removal from aqueous solutions
(2014)The adsorption efficiency of activated biochar prepared from cactus fibres regarding the removal of Cu(II) from aqueous solutions has been investigated as a function of various physicochemical parameters (e.g. pH, initial ...
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The Active Site Structure of Heme a3 3+-C≡N-CuB2+ of Cytochrome aa 3 Oxidase as Revealed from Resonance Raman Scattering
(2003)Resonance Raman and FTIR spectroscopies have been employed to investigate the structure of the heme a3-C≡N-CuB complex of oxidized cytochrome aa3 oxidase. The characterization of this complex is essential since a central ...
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Article
Addition of Electron-Rich Aromatics to Azafullerenium Carbocation. A Stepwise Electrophilic Substitution Mechanism
(2003)(Matrix presented) The reaction between the C59N+ carbocation and the electron-rich aromatic compounds toluene and anisole has been mechanistically studied. The measured intermolecular kinetic isotope effects are consistent ...
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Addition of tetraethylthiuram disulfide to antimony(III) iodide
(2016)Three new antimony(III) iodide complexes with the N,N-diethylcarbamodithioic acid of formulae {[(SbI(Et2DTC)2)(I2)]n} (1), {[(Sb(Et2DTC)2)4 (SbI6) (I3)]n} (2) and {[SbI(Et2DTC)2]2} (3), (Et2DTCH: N,N-diethylcarbamodithioic ...
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Adsorption of boron on iron-oxide in aqueous solutions
(2012)The adsorption of boron on iron-oxide (FeO(OH)) has been investigated in aqueous solutions as a function of pH, ionic strength, temperature, boron concentration and amount of the adsorbent. Analysis of the experimental ...
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Adsorption of hexavalent chromium on dunite
(2011)The paper presents and discusses the effect of various physicochemical parameters (e.g. pH, ionic strength, Cr(VI) initial concentration, amount of the adsorbent, temperature and contact time between metal ion and adsorbent) ...
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Adsorption of hexavalent uranium on biomass by-product
(2007)The effectiveness of the uranium removal by olive cake from aqueous solutions has been demonstrated in batch type experiments under normal atmospheric conditions. The adsorption capacity has been evaluated by using both ...
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Article
Adsorption of nitrogen and water vapour by activated Kevlar® chars
(1993)Fibrous activated carbons were prepared from Kevlar® (i.e. poly (p-phenylene terephthalamide), in the form of a commercially available woven textile. The cloth was carbonised in nitrogen and activated in either steam or ...
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Adsorption of nitrogen and water vapour by activated Nomex® chars
(1995)Fibrous activated carbons were prepared from Nomex® poly(m-phenylene isophthalamide), in the form of a commercially available woven textile. After carbonisation in nitrogen and activation in either carbon dioxide or steam ...