Porous carbon-based supercapacitor has been regarded as a promising candidate for powering wearab... more Porous carbon-based supercapacitor has been regarded as a promising candidate for powering wearable electronics. To improve its energy density and mechanical flexibility, great efforts have been ma...
The synthesis of the presented nanotubes is done by a substitution reaction with single wall (SW)... more The synthesis of the presented nanotubes is done by a substitution reaction with single wall (SW) or multi wall carbon nanotubes (MWCNT) as starting material. The source for boron is B2O3 powder which melts at about 460°C. The nitrogen is offered by a N2 or NH3 atmosphere in the furnace. In some experiments for BN nanotube (BNNT) growth a MoO3 catalyst was used in addition [2]. The TEM examinations were carried out by a 300 kV microscope (FEI, Tecnai F30) with an energy filter (GATAN GIF 200) mounted post column. For sample preparation the NTs were simply glued to a copper support grid.
In this study, the core–shell silica nanospheres modified with titanium dioxide were tested in th... more In this study, the core–shell silica nanospheres modified with titanium dioxide were tested in the photocatalytic decomposition of dyes. The presented data underlines the advantages and shortcomings in the potential application of silica-based catalysts to neutralize organic pollutants. During the photocatalytic reaction in distilled water, catalysts showed decreased efficiency due to a carbon layer deposited on its surface. This finding set an additional goal to investigate the possibility of regenerating the photocatalyst. Studies have shown that the catalyst could be successfully reused following the thermal removal of deposited carbon. Furthermore, the reactivated silica−titania catalysts exhibited comparable photocatalytic performance to the newly made nanomaterial. Surprisingly, catalyst application in the river water eventually resulted in the permanent deactivation of silica−titania nanospheres, which was caused by the interchangeable silica dissolution/precipitation process on the surface of the studied nanomaterial. In environmental water, silica dissolves and precipitates on titanium dioxide’s surface, blocking the interaction between organic compounds and TiO2. The deactivation occurring in the environmental samples is irreversible. In distilled water, the decomposition of organic compounds leads to photocatalysts’ deactivation by forming a carbon layer on their surface. Reactivation of the silica-based photocatalyst after distilled water is achievable by annealing at a high temperature. In light of our findings, the combination of the photocatalytic properties of TiO2 and the silica template shows no prospects in the purification of polluted waste or environmental water.
In this study, the core–shell silica nanospheres modified with titanium dioxide were tested in th... more In this study, the core–shell silica nanospheres modified with titanium dioxide were tested in the photocatalytic decomposition of dyes. The presented data underlines the advantages and shortcomings in the potential application of silica-based catalysts to neutralize organic pollutants. During the photocatalytic reaction in distilled water, catalysts showed decreased efficiency due to a carbon layer deposited on its surface. This finding set an additional goal to investigate the possibility of regenerating the photocatalyst. Studies have shown that the catalyst could be successfully reused following the thermal removal of deposited carbon. Furthermore, the reactivated silica−titania catalysts exhibited comparable photocatalytic performance to the newly made nanomaterial. Surprisingly, catalyst application in the river water eventually resulted in the permanent deactivation of silica−titania nanospheres, which was caused by the interchangeable silica dissolution/precipitation process on the surface of the studied nanomaterial. In environmental water, silica dissolves and precipitates on titanium dioxide’s surface, blocking the interaction between organic compounds and TiO2. The deactivation occurring in the environmental samples is irreversible. In distilled water, the decomposition of organic compounds leads to photocatalysts’ deactivation by forming a carbon layer on their surface. Reactivation of the silica-based photocatalyst after distilled water is achievable by annealing at a high temperature. In light of our findings, the combination of the photocatalytic properties of TiO2 and the silica template shows no prospects in the purification of polluted waste or environmental water.
A cable-like photocatalyst, TiBs@MCN, with a larger specific surface area and higher visible-ligh... more A cable-like photocatalyst, TiBs@MCN, with a larger specific surface area and higher visible-light photocatalytic activity, is successfully fabricated by an in situ hydrothermal self-assembly approach.
A cable-like photocatalyst, TiBs@MCN, with a larger specific surface area and higher visible-ligh... more A cable-like photocatalyst, TiBs@MCN, with a larger specific surface area and higher visible-light photocatalytic activity, is successfully fabricated by an in situ hydrothermal self-assembly approach.
The effect of magnetic fields (MFs) on mammalian cells in vitro has been studied to clarify in gr... more The effect of magnetic fields (MFs) on mammalian cells in vitro has been studied to clarify in greater details potential influence on biological systems. In spite of the numerous and valuable experiments, the MF molecular mechanisms that affect cells still remain unclear. Thus, the aim of the study was to evaluate the cellular response of L929 fibroblast cell line to a rotating magnetic field (RMF) for 8-h exposure incubation period. We conclude that the exposure of L929 fibroblasts to the rotating magnetic field (RMF) in tested magnetic flux density range alerted the cellular dehydrogenases metabolism in a dose-dependent manner, with the highest values in dehydrogenases activity for cells incubated at 10.06 mT and lowest incubated at 1.23 mT of RMF.
Porous carbon-based supercapacitor has been regarded as a promising candidate for powering wearab... more Porous carbon-based supercapacitor has been regarded as a promising candidate for powering wearable electronics. To improve its energy density and mechanical flexibility, great efforts have been ma...
The synthesis of the presented nanotubes is done by a substitution reaction with single wall (SW)... more The synthesis of the presented nanotubes is done by a substitution reaction with single wall (SW) or multi wall carbon nanotubes (MWCNT) as starting material. The source for boron is B2O3 powder which melts at about 460°C. The nitrogen is offered by a N2 or NH3 atmosphere in the furnace. In some experiments for BN nanotube (BNNT) growth a MoO3 catalyst was used in addition [2]. The TEM examinations were carried out by a 300 kV microscope (FEI, Tecnai F30) with an energy filter (GATAN GIF 200) mounted post column. For sample preparation the NTs were simply glued to a copper support grid.
In this study, the core–shell silica nanospheres modified with titanium dioxide were tested in th... more In this study, the core–shell silica nanospheres modified with titanium dioxide were tested in the photocatalytic decomposition of dyes. The presented data underlines the advantages and shortcomings in the potential application of silica-based catalysts to neutralize organic pollutants. During the photocatalytic reaction in distilled water, catalysts showed decreased efficiency due to a carbon layer deposited on its surface. This finding set an additional goal to investigate the possibility of regenerating the photocatalyst. Studies have shown that the catalyst could be successfully reused following the thermal removal of deposited carbon. Furthermore, the reactivated silica−titania catalysts exhibited comparable photocatalytic performance to the newly made nanomaterial. Surprisingly, catalyst application in the river water eventually resulted in the permanent deactivation of silica−titania nanospheres, which was caused by the interchangeable silica dissolution/precipitation process on the surface of the studied nanomaterial. In environmental water, silica dissolves and precipitates on titanium dioxide’s surface, blocking the interaction between organic compounds and TiO2. The deactivation occurring in the environmental samples is irreversible. In distilled water, the decomposition of organic compounds leads to photocatalysts’ deactivation by forming a carbon layer on their surface. Reactivation of the silica-based photocatalyst after distilled water is achievable by annealing at a high temperature. In light of our findings, the combination of the photocatalytic properties of TiO2 and the silica template shows no prospects in the purification of polluted waste or environmental water.
In this study, the core–shell silica nanospheres modified with titanium dioxide were tested in th... more In this study, the core–shell silica nanospheres modified with titanium dioxide were tested in the photocatalytic decomposition of dyes. The presented data underlines the advantages and shortcomings in the potential application of silica-based catalysts to neutralize organic pollutants. During the photocatalytic reaction in distilled water, catalysts showed decreased efficiency due to a carbon layer deposited on its surface. This finding set an additional goal to investigate the possibility of regenerating the photocatalyst. Studies have shown that the catalyst could be successfully reused following the thermal removal of deposited carbon. Furthermore, the reactivated silica−titania catalysts exhibited comparable photocatalytic performance to the newly made nanomaterial. Surprisingly, catalyst application in the river water eventually resulted in the permanent deactivation of silica−titania nanospheres, which was caused by the interchangeable silica dissolution/precipitation process on the surface of the studied nanomaterial. In environmental water, silica dissolves and precipitates on titanium dioxide’s surface, blocking the interaction between organic compounds and TiO2. The deactivation occurring in the environmental samples is irreversible. In distilled water, the decomposition of organic compounds leads to photocatalysts’ deactivation by forming a carbon layer on their surface. Reactivation of the silica-based photocatalyst after distilled water is achievable by annealing at a high temperature. In light of our findings, the combination of the photocatalytic properties of TiO2 and the silica template shows no prospects in the purification of polluted waste or environmental water.
A cable-like photocatalyst, TiBs@MCN, with a larger specific surface area and higher visible-ligh... more A cable-like photocatalyst, TiBs@MCN, with a larger specific surface area and higher visible-light photocatalytic activity, is successfully fabricated by an in situ hydrothermal self-assembly approach.
A cable-like photocatalyst, TiBs@MCN, with a larger specific surface area and higher visible-ligh... more A cable-like photocatalyst, TiBs@MCN, with a larger specific surface area and higher visible-light photocatalytic activity, is successfully fabricated by an in situ hydrothermal self-assembly approach.
The effect of magnetic fields (MFs) on mammalian cells in vitro has been studied to clarify in gr... more The effect of magnetic fields (MFs) on mammalian cells in vitro has been studied to clarify in greater details potential influence on biological systems. In spite of the numerous and valuable experiments, the MF molecular mechanisms that affect cells still remain unclear. Thus, the aim of the study was to evaluate the cellular response of L929 fibroblast cell line to a rotating magnetic field (RMF) for 8-h exposure incubation period. We conclude that the exposure of L929 fibroblasts to the rotating magnetic field (RMF) in tested magnetic flux density range alerted the cellular dehydrogenases metabolism in a dose-dependent manner, with the highest values in dehydrogenases activity for cells incubated at 10.06 mT and lowest incubated at 1.23 mT of RMF.
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