Browsing Τμήμα Χημείας / Department of Chemistry by Title

Article

Sample preparation: A critical step in the analysis of cholesterol oxidation products

Georgiou, Christiana A.; Constantinou, Michalis S.; Kapnissi‐Christodoulou, Constantina P. (2014)

In recent years, cholesterol oxidation products (COPs) have drawn scientific interest, particularly due to their implications on human health. A big number of these compounds have been demonstrated to be cytotoxic, mutagenic, ...

Article

SAXS Investigation of ABC Triblock Star Terpolymers in Aqueous Solution

Castelletto, V.; Hamley, I. W.; Triftaridou, Aggeliki I.; Patrickios, Costas S. (2004)

The structure of three different ABC triblock star terpolymers in aqueous solution has been investigated by small-angle x-ray scattering (SAXS). The form factor was modeled using an analytical expression for a Gaussian ...

Article

A scale-up field experiment for the monitoring of a burning process using chemical, audio, and video sensors

Stavrakakis, P.; Agapiou, Agapios; Mikedi, Katerina; Karma, Sofia; Statheropoulos, Miltiades K.; Pallis, George C.; Pappa, Athina A. (2014)

Fires are becoming more violent and frequent resulting in major economic losses and long-lasting effects on communities and ecosystems

Article

Scaling dimensions of nitrogen adsorption characteristics in modulated mesoporous aluminophosphates

Petrakis, Dimitrios E.; Pashalidis, Ioannis; Theocharis, Charis R.; Hudson, M. J.; Pomonis, Phillippos J. (1997)

Mesoporous alumina-aluminophosphates (MAAP) of the general formula Al100P(x)M20 (M = Al, Fe, Cr, and Ni and X = 0, 4.5, 9, 18, 36, 72, and 144) were tested for their pore size distribution by nitrogen adsorption. The ...

Conference Object

Seaonal variations of tritium, uranium and stable isotopes in groundwater and spring waters in the Anthemountas basin, Northern Greece

Kazakis, Nerantzis; Krajcar Bronić, Ines; Barešić, Jadranka; Philippou, Katerina; Pashalidis, Ioannis; Kalaitzidou, Kyriaki; Mitrakas, Manasis; Ioannidou, Alexandra (2019)

Article

The search for cobalt single-molecule magnets: A disk-like Co IIICoII 6 cluster with a ligand derived from a novel transformation of 2-acetylpyridine

Kitos, Alexandros A.; Efthymiou, Constantinos G.; Papatriantafyllopoulou, Constantina; Nastopoulos, Vassilios; Tasiopoulos, Anastasios J.; Manos, Manolis J.; Wernsdorfer, W.; Christou, George; Perlepes, Spyros P. (2011)

The initial employment of 2-acetylpyridine, (py)(Me)CO, in Co cluster chemistry is reported, and the synthesis, crystal structure, and full magnetic study of [Co7(OH)6(L)6](ClO4) 3·1.6H2O (1·1.6H2O) are described

Article

Seasonal variation of the alpha-radioactivity concentration in natural water systems in Cyprus

Tsiaili, A.; Kiliari, T.; Pashalidis, Ioannis (2011)

The study deals with the seasonal variation of the total alpha-radioactivity and the U-238/234 radioactivity concentration of ground waters in Cyprus. The radiometric measurements were performed after pre-concentration and ...

Article

Seasonal variation, chemical behavior and kinetics of uranium in an unconfined groundwater system

Efstathiou, Maria; Aristarchou, T.; Kiliari, T.; Demetriou, Antri; Pashalidis, Ioannis (2014)

The seasonal changes in the concentration of uranium in an unconfined groundwater system in Cyprus have been investigated and compared to corresponding changes of boron and salinity, to better understand the chemical ...

Article

Selective catalytic reduction of nitric oxide by methane in the presence of oxygen over CaO catalyst

Fliatoura, K. D.; Verykios, Xenophon E.; Costa, Costas N.; Efstathiou, Angelos M. (1999)

The selective catalytic reduction of nitric oxide by methane in the presence of oxygen was studied over CaO catalyst in the temperature range 550-850°C. The nitric oxide conversion-versus-temperature profile was found to ...

Article

Selective catalytic reduction of nitric oxide with ammonia overV2O5/TiO2 catalyst: A steady-state and transient kinetic study

Efstathiou, Angelos M.; Fliatoura, K. (1995)

The kinetics of the selective catalytic reduction (SCR) of nitric oxide with ammonia over an 8 mol-% V2O5/TiO2 catalyst was studied in the temperature range 180-380°C, nitric oxide and ammonia feed concentrations in the ...

Article

The selective catalytic reduction of nitric oxide with methane over La2O3-CaO systems: Synergistic effects and surface reactivity studies of NO, CH4, O2, and CO2 by transient techniques

Costa, Costas N.; Anastasiadou, T.; Efstathiou, Angelos M. (2000)

Dispersing La2O3 crystallites in a 5 wt% La2O3-CaO mixed oxide system significantly enhances the intrinsic rate of NO reduction by CH4 in the presence of 5% O2 at 550°C compared to pure La2O3 and CaO phases. A synergistic ...

Article

Selective catalytic reduction of NO by H2/C3H6 over Pt/Ce1-xZrxO2-Δ: The synergy effect studied by transient techniques

Kalamaras, Christos M.; Olympiou, G. G.; Pârvulescu, V. I.; Cojocaru, B.; Efstathiou, Angelos M. (2017)

A series of Pt/CexZr1-xO2-δ(x = 0.4–0.6) solids were synthesized and evaluated for the SCR of NO under lean burn conditions (2.5 vol% O2) using C3H6and H2as reducing agents. SSITKA-Mass Spectrometry, SSITKA-DRIFTS and other ...

Article

Selective catalytic reduction of NOx by hydrogen (H2-SCR) on WOx-promoted CezZr1-zO2 solids

Väliheikki, A.; Petallidou, Klito C.; Kalamaras, Christos M.; Kolli, T.; Huuhtanen, M.; Maunula, T.; Keiski, R. L.; Efstathiou, Angelos M. (2014)

The selective catalytic reduction of NOx by H2 (H2-SCR) under strongly oxidizing conditions (520ppm NOx/1% H2/5% O2/10% CO2/He

Article

Selective CO2 adsorption in water-stable alkaline-earth based metal–organic frameworks

Tang, Yiwen; Kourtellaris, Andreas; Tasiopoulos, Anastasios J.; Teat, Simon J.; Dubbeldam, David; Rothenberg, Gadi; Tanase, Stefania (2018)

Four novel metal–organic frameworks (MOFs) built from alkaline-earth metal ions and the flexible tetrahedral carboxylate ligand tetrakis[4-(carboxyphenyl)oxamethyl]methane acid (H4L) were synthesized using solvothermal ...

Article

The Selective Oxidation of Methane to C2-hydrocarbons over Li+-Doped TiO2: Catalytic and Mechanistic Studies

Efstathiou, Angelos M.; Papageorgiou, D.; Verykios, Xenophon E. (1994)

This chapter presents the performance of Li+-doped TiO2 catalysts and mechanistic conclusions derived from various transient experiments related to the reactivity of C2–hydrocarbons with the lattice oxygen of the catalyst. ...

Article

The selective oxidation of methane to C2-hydrocarbons over lithium-doped TiO2 catalysts

Papageorgiou, D.; Efstathiou, Angelos M.; Verykios, Xenophon E. (1994)

The oxidative coupling of methane (OCM) to C2-hydrocarbons was studied on a series of lithiumdoped titania catalysts by cofeeding methane (PCH4 = 0.5 bar) and oxygen (Po2 = 0.07-0.16 bar) at 1 bar total pressure in the ...

Article

Selective separation and determination of uranium in calcite and gypsum after EDTA-mediated sample dissolution and cation-exchange

Paschalidou, Polyxeni; Pashalidis, Ioannis (2019)

The present paper describes a relatively simple, effective, very selective and economic method for the determination of uranium in calcite and (phospho)gypsum samples. The analysis is performed by alpha-spectroscopy after ...

Article

Selective separation of actinyl(V,VI) cations from aqueous solutions by Chelex-100

Kiliari, T.; Pashalidis, Ioannis (2012)

Experimental studies on the selectivity of Chelex-100 resin for the separation of actinide cations at different oxidation states (III, IV, V and VI) from aqueous solution have shown that Chelex-100 presents increased ...

Article

Selective separation of radium and uranium from aqueous solutions by Chelex-100

Kiliari, T.; Pashalidis, Ioannis; Symeopoulos, B. D. (2012)

The affinity of Chelex-100 for radium has been investigated as a function of pH and salinity compared to the Chelex-100 affinity for uranium to assess possible application of the resin for the selective separation of the ...

Article

Selective stille coupling reactions of 3-chloro-5-halo(pseudohalo)-4 H -1,2,6-thiadiazin-4-ones

Ioannidou, Heraklidia A.; Kizas, Christos M.; Koutentis, Panayiotis Andreas (2011)

A series of 3-chloro-5-halo(pseudohalo)-4H-1,2,6-thiadiazin-4-ones (halo/pseudohalo = Br, I, OTf) are prepared from 3,5-dichloro-4H-1,2,6- thiadiazin-4-one (3) in good yields. Of these the triflate reacts with tributyltin ...