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001-es BibID:	BIBFORM088388
035-os BibID:	(cikkazonosító)7063 (Scopus)85092778560 (WOS)000585101300001
Első szerző:	Hajdu Péter (gyorsító üzemeltető mérnök)
Cím:	Optimized Size and Distribution of Silver Nanoparticles on the Surface of Titanium Implant Regarding Cell Viability / Hajdu Péter, Lampé István, Rácz Richárd, Biri Sándor, Csík Attila, Tóth Ferenc, Szalóki Melinda, Hegedűs Viktória, Dombrádi Zsuzsanna, Varga István, Csarnovics István, Kökényesi Sándor, Beke Dezső László, Hegedűs Csaba
Dátum:	2020
ISSN:	2076-3417
Megjegyzések:	Though the antibacterial effect is advantageous, silver and silver nanoparticles can negatively affect the viability of human tissues. This study aims to check the viability of cells on surfaces with different particle size and to find the biologically optimal configuration. We investigated the effect of modified thickness of vaporized silver and applied heat and time on the physical characteristics of silver nanoparticle covered titanium surfaces. Samples were examined by scanning electron microscopy, mass spectrometry, and drop shape analyzer. To investigate how different physical surface characteristics influence cell viability, Alamar Blue assay for dental pulp stem cells was carried out. We found that different surface characteristics can be achieved by modifying procedures when creating silver nanoparticle covered titanium. The size of the nanoparticles varied between 60 to 368 nm, and hydrophilicity varied between 63 and 105 degrees of contact angle. Investigations also demonstrated that different physical characteristics are related to a different level of viability. Surfaces covered with 60 nm particle sizes proved to be the most hydrophilic, and the viability of the cells was comparable to the viability measured on the untreated control surface. Physical and biological characteristics of silver nanoparticle covered titanium, including cell viability, have an acceptable level to be used for antibacterial effects to prevent periimplantitis around implants.
Tárgyszavak:	Orvostudományok Klinikai orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk silver nanoparticles antibacterial effect periimplantitis cell viability
Megjelenés:	Applied Sciences-Basel. - 10 : 20 (2020), p. 1-13. -
További szerzők:	Lampé István (1960-) (fogszakorvos) Rácz Richárd (1985-) (fizikus) Biri Sándor Csik Attila (1975-) (fizikus) Tóth Ferenc (1980-) (molekuláris biológus) Szalóki Melinda (1981-) (vegyész) Hegedűs Viktória (1986-) (fogorvos) Dombrádi Zsuzsanna Rita (1983-) (molekuláris biológus, mikrobiológus) Varga István (1974-) (fogszakorvos) Csarnovics István (1986-) (fizikus) Kökényesi Sándor (1946-) (fizikus) Beke Dezső László (1945-) (fizikus) Hegedűs Csaba (1953-) (fogszakorvos)
Pályázati támogatás:	GINOP-2.3.2-15-2016-00011 GINOP GINOP-2.3.2-15-2016-00022 GINOP GINOP-2.3.2-15-2016-00041 GINOP GINOP-2.3.3-15-2016-00029 GINOP NKFIH-1150-6/2019 NKFIH
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001-es BibID:	BIBFORM094624
035-os BibID:	(cikkazonosító)4943 (WOS)000659635900001 (Scopus)85107914481
Első szerző:	Lakatos Ákos (fizikus, környezetmérnök, létesítménymérnök)
Cím:	Systematic analysis of micro-fiber thermal insulations from thermal properties point of view / Ákos Lakatos, István Csarnovics, Attila Csík
Dátum:	2021
ISSN:	2076-3417
Megjegyzések:	This paper contains laboratory measurements of four different micro-fiber thermal insulation materials to reveal their applicability limits under various environmental conditions. On the samples, scanning electron microscope investigations were executed to disclose the structure of the fibers. The study also investigated the most important thermal parameters of the samples, namely, the thermal conductivity and the calorific value with the specific heat capacity. Humidity measurements and hydrophobic tests were also conducted and the sorption isotherm of the samples was registered. To reveal the thermal stability as well as the applicability limits, differential scanning calorimetry and Raman spectroscopy measurements have also been performed. As a result of these comprehensive measurements, one can predict the behavior of the samples in various external circumstances. The results can generate further studies and are very useful for both designers, planners, and researchers. In the European Union, almost 40% of all energy consumption comes from buildings, while another 20-25% comes from transport. In the European Union, including Hungary, only buildings with almost-zero energy demand could be built after 2020, and the use of renewable energies must be strengthened. The Renewable Directive stipulated that by 2020, the share of renewable energy in buildings must be 25%, and in transport it must be 10%; the use of electric vehicles is vital. There are about four million dwellings in Hungary, of which approximately three million need to be renovated, and only some of these (a few hundred) meet the cost-optimized level of the 2020 directive. The use of insulation materials is very important in the transport sector, too. Insulation materials are also used by aircraft and electric vehicles. To reduce the energy loss from buildings, different insulation materials can be used; investigations of insulation materials are very important. This paper presents a comprehensive research report on insulation materials which could be used for building elements, HVAC (heating, ventilation, and air conditioning appliances) equipment, and vehicles. In this paper, laboratory investigations will be presented along with calculations to better understand the properties and behavior of these materials. For this, firstly structural analysis with scanning electron microscope will be presented. Moreover, the paper will present thermal conductivity and combustion heat measurement results. The sorption and hydrophobic behavior of the materials will be also revealed. Finally, the article will also display differential scanning calorimetry measurements and Raman spectroscopy results of the samples. The research was conducted on four different types of colorized microfiber lightweight wool insulation.
Tárgyszavak:	Műszaki tudományok Anyagtudományok és technológiák idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk thermal properties fibrous insulation sthermal insulation
Megjelenés:	Applied Sciences-Basel. - 11 : 11 (2021), p. 1-18. -
További szerzők:	Csarnovics István (1986-) (fizikus) Csik Attila (1975-) (fizikus)
Internet cím:	Intézményi repozitóriumban (DEA) tárolt változat DOI
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001-es BibID:	BIBFORM097529
035-os BibID:	(cikkazonosító)9838 (Scopus)85117861846 (WOS)000720035400001
Első szerző:	Pál Petra (anyagkutató)
Cím:	An Investigation of Surface-Enhanced Raman Scattering of Different Analytes Adsorbed on Gold Nanoislands / Pál Petra, Bonyár Attila, Veres Miklós, Juhász Laura, Szalóki Melinda, Csarnovics István
Dátum:	2021
ISSN:	2076-3417
Megjegyzések:	In this study, metallic nanoislands were prepared by thermal annealing of gold thin film produced by vacuum evaporation on a glass substrate to investigate the surface-enhanced Raman scattering (SERS) effect on them. The influence of the analyte on the enhancement factor of SERS was studied with riboflavin and rhodamine 6G dye. Two laser excitation sources at 532 and 633 nm wavelengths were used for SERS measurements. We found that the enhancement factors of the gold nanoisland SERS substrates were influenced by the analytes' adsorption tendency onto their surfaces. The SERS amplification was also found to be dependent on the electronic structure of the molecules; higher enhancement factors were obtained for rhodamine 6G with 532 nm excitation, while for riboflavin the 633 nm source performed better
Tárgyszavak:	Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk
Megjelenés:	Applied Sciences-Basel. - 11 : 21 (2021), p. 1-12. -
További szerzők:	Bonyár Attila Veres Miklós Juhász Laura (1993-) (fizikus) Szalóki Melinda (1981-) (vegyész) Csarnovics István (1986-) (fizikus)
Pályázati támogatás:	GINOP-2.3.2-15-2016-00041 GINOP [ÚNKP-21-5-DE-464 Egyéb BO/348/20 MTA
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