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Papers by Athanasios Konstandopoulos PhD

Research paper thumbnail of Optimized filter design and selection criteria for continuously regenerating diesel particulate traps

Sae Transactions, 1999

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Research paper thumbnail of Development and Verification of a Two-Step Thermochemical Process for Solar Hydrogen Production from Water

A two-step thermo-chemical cycle process for solar hydrogen production from water has been develo... more A two-step thermo-chemical cycle process for solar hydrogen production from water has been developed. By using mixed iron-oxide-based redox systems at moderate temperatures the cycle offers promising properties concerning thermodynamics and efficiency and affords pure ...

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Research paper thumbnail of Ceramic Particulate Traps for Diesel Emissions Control - Effects of a Manganese-Copper Fuel Additive

SAE Technical Paper Series, 1988

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Research paper thumbnail of Improved kinetic model for water splitting thermochemical cycles using Nickel Ferrite

International Journal of Hydrogen Energy, Apr 1, 2014

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Research paper thumbnail of The optimum cell density for wall-flow monolithic filters : Effects of filter permeability, soot cake structure and ash loading

Sae Transactions, 2005

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Research paper thumbnail of Study of Oxidation and Combustion Characteristics of Iron Nanoparticles under Idealized and Enginelike Conditions

Energy & Fuels, 2016

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Research paper thumbnail of Catalyst supporting honeycomb and method of manufacturing the same

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Research paper thumbnail of Multi-channel simulation of regeneration in honeycomb monolithic diesel particulate filters

Chemical Engineering Science, Jul 31, 2003

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Research paper thumbnail of Hydrogen production in solar reactors

Catalysis Today, Sep 30, 2007

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Research paper thumbnail of Hydrogen production via sulfur-based thermochemical cycles: Part 2: Performance evaluation of Fe 2O

Fuel and Energy Abstracts, 2011

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Research paper thumbnail of On the Transient Heat Transfer through the Solid Phase in Aggregates and Deposits

Industrial Engineering Chemistry Research, Jun 3, 2002

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Research paper thumbnail of Aerosol spray pyrolysis synthesis of water-splitting ferrites for solar hydrogen production

Granul Matter, 2008

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Research paper thumbnail of Thermische Wasserstoffherstellung in einer Gas-Festphasenreaktion

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Research paper thumbnail of Flow Resistance Descriptors for Diesel Particulate Filters: Definitions, Measurements and Testing

Sae Transactions, Mar 3, 2003

... Auteur(s) / Author(s). KONSTANDOPOULOS Athanasios G. ; Résumé / Abstract. In the present work... more ... Auteur(s) / Author(s). KONSTANDOPOULOS Athanasios G. ; Résumé / Abstract. In the present work a practice for conducting experiments and analyzing the fundamental descriptors of DieselParticulate Filter (DPF) flow resistance behavior is described. ...

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Research paper thumbnail of Toxicity assessment and comparison between two types of iron oxide nanoparticles in Mytilus galloprovincialis

Aquatic Toxicology, 2016

Nanoparticles (NPs), due to their increased application and production, are being released into t... more Nanoparticles (NPs), due to their increased application and production, are being released into the environment with unpredictable impact on the physiology of marine organisms, as well as on entire ecosystems and upcoming effects on human health. The aim of the present study was to evaluate and compare the oxidative responses of the mussel Mytilus galloprovincialis after exposure to iron oxide NPs and to iron oxide NPs incorporated into zeolite for 1, 3 and 7 days. Our results showed that both effectors induced changes on animal physiology by causing oxidative stress in hemocytes of exposed mussels compared to control animals. This was shown by the significant increase in reactive oxygen species (ROS) production, protein carbonylation, lipid peroxidation, ubiquitin conjugates and DNA damage. In addition an increase in prooxidant levels as measured by the prooxidant-antioxidant balance (PAB) assay was observed in exposed mussels' hemolymph. The results show that ROS, DNA damage, protein and lipid oxidation, ubiquitin conjugates and PAB could constitute, after further investigation, reliable biomarkers for the evaluation of pollution or other environmental stressors. In addition, more studies are needed in order to ensure the safety of these NPs on various biomedical applications, since it is critical to design NPs that they meet the demands of application without causing cellular toxicity.

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Research paper thumbnail of Gas/Solid Phase Reaction

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Research paper thumbnail of The initial sticking fraction of inertially impacting particles on cylindrical and spherical collectors

J Aerosol Sci, 1997

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Research paper thumbnail of New routes for ferrite powders synthesis

... 2002. [4] Z. Yue, L. Li, J. Zhou, H. Zhang and Z. Gui, Preparation and characterization of Ni... more ... 2002. [4] Z. Yue, L. Li, J. Zhou, H. Zhang and Z. Gui, Preparation and characterization of NiCuZn ferrite nanocrystalline powders by auto-combustion of nitrate-citrate gels, Materials Science and Engineering B, 64, 68-72, 1999. [5 ...

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Research paper thumbnail of Stability of catalyst materials and porous absorbers for decomposition of sulphuric acid in a solar reactor

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Research paper thumbnail of Assessing the axonal translocation of CeO2 and SiO2 nanoparticles in the sciatic nerve fibers of the frog: an ex vivo electrophysiological study

International Journal of Nanomedicine, 2015

The axonal translocation of two commonly used nanoparticles in medicine, namely CeO2 and SiO2, is... more The axonal translocation of two commonly used nanoparticles in medicine, namely CeO2 and SiO2, is investigated. The study was conducted on frog sciatic nerve fibers in an ex vivo preparation. Nanoparticles were applied at the proximal end of the excised nerve. A nerve stimulation protocol was followed for over 35 hours. Nerve vitality curve comparison between control and exposed nerves showed that CeO2 has no neurotoxic effect at the concentrations tested. After exposure, specimens were fixed and then screen scanned every 1 mm along their length for nanoparticle presence by means of Fourier transform infrared microscopy. We demonstrated that both nanoparticles translocate within the nerve by formation of narrow bands in the Fourier transform infrared spectrum. For the CeO2, we also demonstrated that the translocation depends on both axonal integrity and electrical activity. The speed of translocation for the two species was estimated in the range of 0.45-0.58 mm/h, close to slow axonal transportation rate. Transmission electron microscopy provided direct evidence for the presence of SiO2 in the treated nerves.

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Research paper thumbnail of Optimized filter design and selection criteria for continuously regenerating diesel particulate traps

Sae Transactions, 1999

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Research paper thumbnail of Development and Verification of a Two-Step Thermochemical Process for Solar Hydrogen Production from Water

A two-step thermo-chemical cycle process for solar hydrogen production from water has been develo... more A two-step thermo-chemical cycle process for solar hydrogen production from water has been developed. By using mixed iron-oxide-based redox systems at moderate temperatures the cycle offers promising properties concerning thermodynamics and efficiency and affords pure ...

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Research paper thumbnail of Ceramic Particulate Traps for Diesel Emissions Control - Effects of a Manganese-Copper Fuel Additive

SAE Technical Paper Series, 1988

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Research paper thumbnail of Improved kinetic model for water splitting thermochemical cycles using Nickel Ferrite

International Journal of Hydrogen Energy, Apr 1, 2014

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Research paper thumbnail of The optimum cell density for wall-flow monolithic filters : Effects of filter permeability, soot cake structure and ash loading

Sae Transactions, 2005

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Research paper thumbnail of Study of Oxidation and Combustion Characteristics of Iron Nanoparticles under Idealized and Enginelike Conditions

Energy & Fuels, 2016

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Catalyst supporting honeycomb and method of manufacturing the same

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Multi-channel simulation of regeneration in honeycomb monolithic diesel particulate filters

Chemical Engineering Science, Jul 31, 2003

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Research paper thumbnail of Hydrogen production in solar reactors

Catalysis Today, Sep 30, 2007

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Research paper thumbnail of Hydrogen production via sulfur-based thermochemical cycles: Part 2: Performance evaluation of Fe 2O

Fuel and Energy Abstracts, 2011

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Research paper thumbnail of On the Transient Heat Transfer through the Solid Phase in Aggregates and Deposits

Industrial Engineering Chemistry Research, Jun 3, 2002

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Research paper thumbnail of Aerosol spray pyrolysis synthesis of water-splitting ferrites for solar hydrogen production

Granul Matter, 2008

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Thermische Wasserstoffherstellung in einer Gas-Festphasenreaktion

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Flow Resistance Descriptors for Diesel Particulate Filters: Definitions, Measurements and Testing

Sae Transactions, Mar 3, 2003

... Auteur(s) / Author(s). KONSTANDOPOULOS Athanasios G. ; Résumé / Abstract. In the present work... more ... Auteur(s) / Author(s). KONSTANDOPOULOS Athanasios G. ; Résumé / Abstract. In the present work a practice for conducting experiments and analyzing the fundamental descriptors of DieselParticulate Filter (DPF) flow resistance behavior is described. ...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Toxicity assessment and comparison between two types of iron oxide nanoparticles in Mytilus galloprovincialis

Aquatic Toxicology, 2016

Nanoparticles (NPs), due to their increased application and production, are being released into t... more Nanoparticles (NPs), due to their increased application and production, are being released into the environment with unpredictable impact on the physiology of marine organisms, as well as on entire ecosystems and upcoming effects on human health. The aim of the present study was to evaluate and compare the oxidative responses of the mussel Mytilus galloprovincialis after exposure to iron oxide NPs and to iron oxide NPs incorporated into zeolite for 1, 3 and 7 days. Our results showed that both effectors induced changes on animal physiology by causing oxidative stress in hemocytes of exposed mussels compared to control animals. This was shown by the significant increase in reactive oxygen species (ROS) production, protein carbonylation, lipid peroxidation, ubiquitin conjugates and DNA damage. In addition an increase in prooxidant levels as measured by the prooxidant-antioxidant balance (PAB) assay was observed in exposed mussels' hemolymph. The results show that ROS, DNA damage, protein and lipid oxidation, ubiquitin conjugates and PAB could constitute, after further investigation, reliable biomarkers for the evaluation of pollution or other environmental stressors. In addition, more studies are needed in order to ensure the safety of these NPs on various biomedical applications, since it is critical to design NPs that they meet the demands of application without causing cellular toxicity.

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Research paper thumbnail of Gas/Solid Phase Reaction

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Research paper thumbnail of The initial sticking fraction of inertially impacting particles on cylindrical and spherical collectors

J Aerosol Sci, 1997

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Research paper thumbnail of New routes for ferrite powders synthesis

... 2002. [4] Z. Yue, L. Li, J. Zhou, H. Zhang and Z. Gui, Preparation and characterization of Ni... more ... 2002. [4] Z. Yue, L. Li, J. Zhou, H. Zhang and Z. Gui, Preparation and characterization of NiCuZn ferrite nanocrystalline powders by auto-combustion of nitrate-citrate gels, Materials Science and Engineering B, 64, 68-72, 1999. [5 ...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Stability of catalyst materials and porous absorbers for decomposition of sulphuric acid in a solar reactor

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Assessing the axonal translocation of CeO2 and SiO2 nanoparticles in the sciatic nerve fibers of the frog: an ex vivo electrophysiological study

International Journal of Nanomedicine, 2015

The axonal translocation of two commonly used nanoparticles in medicine, namely CeO2 and SiO2, is... more The axonal translocation of two commonly used nanoparticles in medicine, namely CeO2 and SiO2, is investigated. The study was conducted on frog sciatic nerve fibers in an ex vivo preparation. Nanoparticles were applied at the proximal end of the excised nerve. A nerve stimulation protocol was followed for over 35 hours. Nerve vitality curve comparison between control and exposed nerves showed that CeO2 has no neurotoxic effect at the concentrations tested. After exposure, specimens were fixed and then screen scanned every 1 mm along their length for nanoparticle presence by means of Fourier transform infrared microscopy. We demonstrated that both nanoparticles translocate within the nerve by formation of narrow bands in the Fourier transform infrared spectrum. For the CeO2, we also demonstrated that the translocation depends on both axonal integrity and electrical activity. The speed of translocation for the two species was estimated in the range of 0.45-0.58 mm/h, close to slow axonal transportation rate. Transmission electron microscopy provided direct evidence for the presence of SiO2 in the treated nerves.

Bookmarks Related papers MentionsView impact