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Dr. Konstantinos Simeonidis
Department of Solid State Physics, Aristotle University of Thessaloniki, Thessaloniki, Greece

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Research Keywords & Expertise

0 Heavy Metals
0 magnetism
0 drinking water treatment
0 Adsorption processes
0 Nanoparticle synthesis and characterization

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Journal article
Published: 02 April 2021 in Magnetochemistry
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Magnetic nanoparticles can generate heat when exposed to an alternating magnetic field. Their heating efficacy is governed by their magnetic properties that are in turn determined by their composition, size and morphology. Thus far, iron oxides (e.g., magnetite, Fe3O4) have been the most popular materials in use, though recently bimagnetic core-shell structures are gaining ground. Herein we present a study on the effect of particle morphology on heating efficiency. More specifically, we use zero waste impact methods for the synthesis of metal/metal oxide Fe/Fe3O4 nanoparticles in both spherical and cubic shapes, which present an interesting venue for understanding how spin coupling across interfaces and also finite size effects may influence the magnetic response. We show that these particles can generate sufficient heat (hundreds of watts per gram) to drive hyperthermia applications, whereas faceted nanoparticles demonstrate superior heating capabilities than spherical nanoparticles of similar size.

ACS Style

Carlos Martinez-Boubeta; Konstantinos Simeonidis; Judit Oró; Antonios Makridis; David Serantes; Lluis Balcells. Finding the Limits of Magnetic Hyperthermia on Core-Shell Nanoparticles Fabricated by Physical Vapor Methods. Magnetochemistry 2021, 7, 49 .

AMA Style

Carlos Martinez-Boubeta, Konstantinos Simeonidis, Judit Oró, Antonios Makridis, David Serantes, Lluis Balcells. Finding the Limits of Magnetic Hyperthermia on Core-Shell Nanoparticles Fabricated by Physical Vapor Methods. Magnetochemistry. 2021; 7 (4):49.

Chicago/Turabian Style

Carlos Martinez-Boubeta; Konstantinos Simeonidis; Judit Oró; Antonios Makridis; David Serantes; Lluis Balcells. 2021. "Finding the Limits of Magnetic Hyperthermia on Core-Shell Nanoparticles Fabricated by Physical Vapor Methods." Magnetochemistry 7, no. 4: 49.

Journal article
Published: 22 October 2020 in Minerals
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The importance of magnesite for the EU economy and industry is very high, making the understanding of their genesis for the exploration for new deposits a priority for the raw materials scientific community. In this direction, the study of the magnesite-hosting ultramafic rocks can be proved very useful. For the present study, ultramafic rock samples were collected from the magnesite ore-hosting ophiolite of the Gerakini mining area (Chalkidiki, Greece) to investigate the consecutive alteration events of the rocks which led to the metallogenesis of the significant magnesite ores of the area. All samples were subjected to a series of analytical methods for the determination of their mineralogical and geochemical characteristics: optical microscopy, XRD, SEM, EMPA, ICP–MS/OES and CIPW normalization. The results of these analyses revealed that the ultramafic rocks of the area have not only all been subjected to serpentinization, but these rocks have also undergone carbonation, silification and clay alteration. The latter events are attributed to the circulation of CO2-rich fluids responsible for the formation of the magnesite ores and locally, the further alteration of the serpentinites into listvenites. The current mineralogy of these rocks was found to be linked to one or more alteration event that took place, thus a significant contribution to the metallo- and petrogenetic history of the Gerakini ophiolite has been made. Furthermore, for the first time in literature, Fe inclusions in olivines from Greece were reported.

ACS Style

Evangelos Tzamos; Micol Bussolesi; Giovanni Grieco; Pietro Marescotti; Laura Crispini; Andreas Kasinos; Niccolò Storni; Konstantinos Simeonidis; Anastasios Zouboulis. Mineralogy and Geochemistry of Ultramafic Rocks from Rachoni Magnesite Mine, Gerakini (Chalkidiki, Northern Greece). Minerals 2020, 10, 934 .

AMA Style

Evangelos Tzamos, Micol Bussolesi, Giovanni Grieco, Pietro Marescotti, Laura Crispini, Andreas Kasinos, Niccolò Storni, Konstantinos Simeonidis, Anastasios Zouboulis. Mineralogy and Geochemistry of Ultramafic Rocks from Rachoni Magnesite Mine, Gerakini (Chalkidiki, Northern Greece). Minerals. 2020; 10 (11):934.

Chicago/Turabian Style

Evangelos Tzamos; Micol Bussolesi; Giovanni Grieco; Pietro Marescotti; Laura Crispini; Andreas Kasinos; Niccolò Storni; Konstantinos Simeonidis; Anastasios Zouboulis. 2020. "Mineralogy and Geochemistry of Ultramafic Rocks from Rachoni Magnesite Mine, Gerakini (Chalkidiki, Northern Greece)." Minerals 10, no. 11: 934.

Journal article
Published: 09 April 2020 in Materials
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The surface configuration of tetravalent manganese feroxyhyte (TMFx) was appropriately modified to achieve higher negative surface charge density and, hence, to improve its efficiency for the removal of dissolved Cd and Pb mostly cationic species from water at pH values commonly found in surface or ground waters. This was succeeded by the favorable engagement of Ca2+ cations onto the surface of a mixed Mn-Fe oxy-hydroxide adsorbent during the preparation step, imitating an ion-exchange mechanism between H+ and Ca2+; therefore, the number of available negatively-charged adsorption sites was increased. Particularly, the calcium coverage can increase the deprotonated surface oxygen atoms, which can act as adsorption centers, as well as maintain them during the subsequent drying procedure. The developed Ca-modified adsorbent (denoted as TMFx-Ca) showed around 10% increase of negative surface charge density, reaching 2.0 mmol [H+]/g and enabling higher adsorption capacities for both Cd and Pb aquatic species, as was proved also by carrying out specific rapid small-scale column tests, and it complied with the corresponding strict drinking water regulation limits. The adsorption capacity values were found 6.8 μg·Cd/mg and 35.0 μg·Pb/mg, when the restructured TMFx-Ca adsorbent was used, i.e., higher than those recorded for the unmodified material.

ACS Style

Evgenios Kokkinos; Chasan Chousein; Konstantinos Simeonidis; Sandra Coles; Anastasios Zouboulis; Manassis Mitrakas. Improvement of Manganese Feroxyhyte’s Surface Charge with Exchangeable Ca Ions to Maximize Cd and Pb Uptake from Water. Materials 2020, 13, 1762 .

AMA Style

Evgenios Kokkinos, Chasan Chousein, Konstantinos Simeonidis, Sandra Coles, Anastasios Zouboulis, Manassis Mitrakas. Improvement of Manganese Feroxyhyte’s Surface Charge with Exchangeable Ca Ions to Maximize Cd and Pb Uptake from Water. Materials. 2020; 13 (7):1762.

Chicago/Turabian Style

Evgenios Kokkinos; Chasan Chousein; Konstantinos Simeonidis; Sandra Coles; Anastasios Zouboulis; Manassis Mitrakas. 2020. "Improvement of Manganese Feroxyhyte’s Surface Charge with Exchangeable Ca Ions to Maximize Cd and Pb Uptake from Water." Materials 13, no. 7: 1762.