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Two substitution levels of Portland cement by silica fume (SF; 30 and 50 mass%) and three hydrothermal treatment regimes (0.5, 1.2, and 2 MPa and 165, 195, and 220 °C for 7 days, respectively) were selected for the investigation of high-temperature phase formation. A combination of thermogravimetric, X-ray diffraction, and Fourier transform infrared analyses in the mid-IR region was used to overcome the shortcomings of individual techniques for the identification of these complex systems. Changes in molecular water amounts, the polymerization degree of silicate chains, or their decomposition due to transformations and crystallization of phases at hydrothermal conditions were observed and discussed concerning composition. Contrary to the calciochondrite, hydrogrossular phases, α-C2SH, and jaffeite detected in the systems without SF, a decrease in CaO/SiO2 ratio resulted in the formation of stable tobermorite in the case of 30 mass% SF, whilst calcium hydrogen silicate, gyrolite, and cowlesite were identified as more thermally stable phases in the samples with 50 mass% SF.
Eva Kuzielová; Michal Slaný; Matúš Žemlička; Jiří Másilko; Martin Palou. Phase Composition of Silica Fume—Portland Cement Systems Formed under Hydrothermal Curing Evaluated by FTIR, XRD, and TGA. Materials 2021, 14, 2786 .
AMA StyleEva Kuzielová, Michal Slaný, Matúš Žemlička, Jiří Másilko, Martin Palou. Phase Composition of Silica Fume—Portland Cement Systems Formed under Hydrothermal Curing Evaluated by FTIR, XRD, and TGA. Materials. 2021; 14 (11):2786.
Chicago/Turabian StyleEva Kuzielová; Michal Slaný; Matúš Žemlička; Jiří Másilko; Martin Palou. 2021. "Phase Composition of Silica Fume—Portland Cement Systems Formed under Hydrothermal Curing Evaluated by FTIR, XRD, and TGA." Materials 14, no. 11: 2786.
The present study investigated the structure, morphology, thermal behavior, and bacterial growth analysis of novel three-component hybrid materials synthesized by the sol-gel method. The inorganic silica matrix was weakly bonded to the network of two organic components: a well-known polymer such as polyethylene glycol (PEG, average molar mass of about 4000 g/mol), and an antioxidant constituted by chlorogenic acid (CGA). In particular, a first series was made by a 50 wt% PEG-based (CGA-free) silica hybrid along with two 50 wt% PEG-based hybrids containing 10 and 20 wt% of CGA (denoted as SP50, SP50C10 and SP50C20, respectively). A second series contained a fixed amount of CGA (20 wt%) in silica-based hybrids: one was the PEG-free material (SC20) and the other two contained 12 and 50 wt% of PEG, respectively (SP12C20 and SP50C20, respectively), being the latter already included in the first series. The X-ray diffraction (XRD) patterns and scanning electron microscope (SEM) images of freshly prepared materials confirmed that all the materials were amorphous and homogeneous regardless of the content of PEG or CGA. The thermogravimetric (TG) analysis revealed a higher water content was adsorbed into the two component hybrids (SP50 and SC20) because of the availability of a larger number of H-bonds to be formed with water with respect to those of silica/PEG/CGA (SPC), where silica matrix was involved in these bonds with both organic components. Conversely, the PEG-rich materials (SP50C10 and SP50C20, both with 50 wt% of the polymer) retained a lower content of water. Decomposition of PEG and CGA occurred in almost the same temperature interval regardless of the content of each organic component. The antibacterial properties of the SiO2/PEG/CGA hybrid materials were studied in pellets using either Escherichia coli and Enterococcus faecalis, respectively. Excellent antibacterial activity was found against both bacteria regardless of the amount of polymer in the hybrids.
Michelina Catauro; Pavel Šiler; Jiří Másilko; Roberta Risoluti; Stefano Vecchio Ciprioti. Synthesis, Structural, Morphological and Thermal Characterization of Five Different Silica-Polyethylene Glycol-Chlorogenic Acid Hybrid Materials. Polymers 2021, 13, 1586 .
AMA StyleMichelina Catauro, Pavel Šiler, Jiří Másilko, Roberta Risoluti, Stefano Vecchio Ciprioti. Synthesis, Structural, Morphological and Thermal Characterization of Five Different Silica-Polyethylene Glycol-Chlorogenic Acid Hybrid Materials. Polymers. 2021; 13 (10):1586.
Chicago/Turabian StyleMichelina Catauro; Pavel Šiler; Jiří Másilko; Roberta Risoluti; Stefano Vecchio Ciprioti. 2021. "Synthesis, Structural, Morphological and Thermal Characterization of Five Different Silica-Polyethylene Glycol-Chlorogenic Acid Hybrid Materials." Polymers 13, no. 10: 1586.
This paper deals with the study of the crystallization and phase transformation of Ni-P coatings deposited on AZ91 magnesium alloy. Prepared samples were characterized in terms of surface morphology and elemental composition by means of scanning electron microscopy with energy-dispersive spectroscopy analysis. The results of X-ray diffraction analysis and differential scanning calorimetry suggested that increasing the phosphorus content caused Ni-P coatings to develop an amorphous character. The crystallization of Ni was observed at 150, 250, and 300 °C for low-, medium- and high-phosphorus coatings, respectively. The Ni crystallite size increased with increasing temperature and decreasing P content. Conversely, the presence of the Ni3P phase was observed at a maximum peak of 320 °C for the high-phosphorus coating, whereas the crystallization of the Ni3P phase shifted to higher temperatures with decreasing P content. The Ni3P crystallite size increased with increasing temperature and increasing P content. An increase in microhardness due to the arrangement of Ni atoms and Ni3P precipitation was observed. The deposition of as-deposited Ni-P coatings led to an improvement in the corrosion resistance of AZ91. However, the heat treatment of coatings resulted in a deterioration in corrosion properties due to the formation of microcracks.
Martin Buchtík; Leoš Doskočil; Roman Brescher; Pavel Doležal; Jiří Másilko; Jaromír Wasserbauer. The Effect of Crystallization and Phase Transformation on the Mechanical and Electrochemical Corrosion Properties of Ni-P Coatings. Coatings 2021, 11, 447 .
AMA StyleMartin Buchtík, Leoš Doskočil, Roman Brescher, Pavel Doležal, Jiří Másilko, Jaromír Wasserbauer. The Effect of Crystallization and Phase Transformation on the Mechanical and Electrochemical Corrosion Properties of Ni-P Coatings. Coatings. 2021; 11 (4):447.
Chicago/Turabian StyleMartin Buchtík; Leoš Doskočil; Roman Brescher; Pavel Doležal; Jiří Másilko; Jaromír Wasserbauer. 2021. "The Effect of Crystallization and Phase Transformation on the Mechanical and Electrochemical Corrosion Properties of Ni-P Coatings." Coatings 11, no. 4: 447.
Increasing utilization of secondary raw materials and alternative fuels results in increasing contents of metals in cements. Zinc is one of these elements. It comes to cement with secondary raw materials such as slag or fly ash or by the utilization of used tires as an alternative fuel. Zinc ions significantly prolong the hydration process in cement. This work deals with the influence of zinc ions in the form of very poorly soluble ZnO salt and easily soluble ZnCl2 and Zn(NO3)2 on the hydration of cement blended with fly ash. Zinc was dosed in the range of 0.05%, 0.1%, 0.5% and 1% of cement weight. The effect of zinc on hydration was monitored by isothermal and isoperibolic calorimetry. A 15% addition of fly ash to cement mainly causes further retardation of hydration reactions due to the reactions of fly ash particles with Ca2+ ions from cement. The strongest effect on the hydration retardation from all investigated compounds showed in ZnO as it dissolves very slowly. On the contrary, for the dosage of 1% of zinc in the form of ZnCl2 significant acceleration of hydration occurred. In this work, a synergistic effect on the prolongation of hydration with a combination of cement, zinc and fly ash was demonstrated. The lengths of induction periods were assessed from detected calorimetric curves and from these lengths the curves were gained by fitting with the exponential function. Final products were next analyzed using X-ray diffraction.
Pavel Šiler; Iva Kolářová; Radoslav Novotný; Jiří Másilko; Jan Bednárek; Martin Janča; Jan Koplík; Jan Hajzler; Lukáš Matějka; Michal Marko; Jiří Švec; Martin Zlámal; Eva Kuzielová; Tomáš Opravil; František Šoukal. Use of Isothermal and Isoperibolic Calorimetry to Study the Effect of Zinc on Hydration of Cement Blended with Fly Ash. Materials 2020, 13, 5215 .
AMA StylePavel Šiler, Iva Kolářová, Radoslav Novotný, Jiří Másilko, Jan Bednárek, Martin Janča, Jan Koplík, Jan Hajzler, Lukáš Matějka, Michal Marko, Jiří Švec, Martin Zlámal, Eva Kuzielová, Tomáš Opravil, František Šoukal. Use of Isothermal and Isoperibolic Calorimetry to Study the Effect of Zinc on Hydration of Cement Blended with Fly Ash. Materials. 2020; 13 (22):5215.
Chicago/Turabian StylePavel Šiler; Iva Kolářová; Radoslav Novotný; Jiří Másilko; Jan Bednárek; Martin Janča; Jan Koplík; Jan Hajzler; Lukáš Matějka; Michal Marko; Jiří Švec; Martin Zlámal; Eva Kuzielová; Tomáš Opravil; František Šoukal. 2020. "Use of Isothermal and Isoperibolic Calorimetry to Study the Effect of Zinc on Hydration of Cement Blended with Fly Ash." Materials 13, no. 22: 5215.
Increasing utilization of secondary raw materials and alternative fuels results in increasing contents of metals in cements. One of elements, the content of which keeps rising in cement is zinc. It comes to cement with secondary raw materials such as slag or fly ash or by the utilization of used tires as an alternative fuel. Zinc ions significantly prolong the hydration process in cement. This work deals with the influence of zinc ions in the form of very poorly soluble ZnO salt and easily soluble ZnCl2 and Zn(NO)3 on the hydration of cement blended with fly ash. Zinc was dosed in the range of 0.05, 0.1, 0.5 a 1% of cement weight. Final products were next analyzed using X-Ray Diffraction.
Pavel Šiler; Iva Kolářová; Rdoslav Novotný; Jiří Másilko; Jan Bednárek; Martin Janča; Jan Koplík; Jan Hajzler; Lukáš Matějka; Michal Marko; Jiří Švec; Martin Zlámal; Eva Kuzielová; Tomáš Opravil; Frantisek Soukal. Possibilities of Use of Isothermal and Isoperibolic Calorimetry to Study the Effect of Zinc on Hydration of Cement Blended with Fly Ash. 2020, 1 .
AMA StylePavel Šiler, Iva Kolářová, Rdoslav Novotný, Jiří Másilko, Jan Bednárek, Martin Janča, Jan Koplík, Jan Hajzler, Lukáš Matějka, Michal Marko, Jiří Švec, Martin Zlámal, Eva Kuzielová, Tomáš Opravil, Frantisek Soukal. Possibilities of Use of Isothermal and Isoperibolic Calorimetry to Study the Effect of Zinc on Hydration of Cement Blended with Fly Ash. . 2020; ():1.
Chicago/Turabian StylePavel Šiler; Iva Kolářová; Rdoslav Novotný; Jiří Másilko; Jan Bednárek; Martin Janča; Jan Koplík; Jan Hajzler; Lukáš Matějka; Michal Marko; Jiří Švec; Martin Zlámal; Eva Kuzielová; Tomáš Opravil; Frantisek Soukal. 2020. "Possibilities of Use of Isothermal and Isoperibolic Calorimetry to Study the Effect of Zinc on Hydration of Cement Blended with Fly Ash." , no. : 1.
Aneurinibacillus sp. H1 is a promising, moderately thermophilic, novel Gram-positive bacterium capable of the biosynthesis of polyhydroxyalkanoates (PHA) with tunable monomer composition. In particular, the strain is able to synthesize copolymers of 3-hydroxybutyrate (3HB), 4-hydroxybutyrate (4HB) and 3-hydroxyvalerate (3HV) with remarkably high 4HB and 3HV fractions. In this study we performed an in-depth material analysis of PHA polymers produced by Aneurinibacillus sp. H1 in order to describe how the monomer composition affects fundamental structural and physicochemical parameters of the materials in the form of solvent-casted films. Results of infrared spectroscopy, X-ray diffractometry and thermal analysis clearly show that controlling the monomer composition enables optimization of PHA crystallinity both qualitatively (the type of the crystalline lattice) and quantitatively (the overall degree of crystallinity). Furthermore, resistance of the films against thermal and/or enzymatic degradation can also be manipulated by the monomer composition. Results of this study hence confirm Aneurinibacillus sp. H1 as an auspicious candidate for thermophilic production of PHA polymers with material properties that can be tuned together with their chemical composition by the corresponding adjustment of the cultivation process.
Petr Sedlacek; Iva Pernicova; Ivana Novackova; Xenie Kourilova; Michal Kalina; Adriana Kovalcik; Martin Koller; Jana Nebesarova; Vladislav Krzyzanek; Kamila Hrubanova; Jiri Masilko; Eva Slaninova; Monika Trudicova; Stanislav Obruca. Introducing the Newly Isolated Bacterium Aneurinibacillus sp. H1 as an Auspicious Thermophilic Producer of Various Polyhydroxyalkanoates (PHA) Copolymers–2. Material Study on the Produced Copolymers. Polymers 2020, 12, 1 .
AMA StylePetr Sedlacek, Iva Pernicova, Ivana Novackova, Xenie Kourilova, Michal Kalina, Adriana Kovalcik, Martin Koller, Jana Nebesarova, Vladislav Krzyzanek, Kamila Hrubanova, Jiri Masilko, Eva Slaninova, Monika Trudicova, Stanislav Obruca. Introducing the Newly Isolated Bacterium Aneurinibacillus sp. H1 as an Auspicious Thermophilic Producer of Various Polyhydroxyalkanoates (PHA) Copolymers–2. Material Study on the Produced Copolymers. Polymers. 2020; 12 (6):1.
Chicago/Turabian StylePetr Sedlacek; Iva Pernicova; Ivana Novackova; Xenie Kourilova; Michal Kalina; Adriana Kovalcik; Martin Koller; Jana Nebesarova; Vladislav Krzyzanek; Kamila Hrubanova; Jiri Masilko; Eva Slaninova; Monika Trudicova; Stanislav Obruca. 2020. "Introducing the Newly Isolated Bacterium Aneurinibacillus sp. H1 as an Auspicious Thermophilic Producer of Various Polyhydroxyalkanoates (PHA) Copolymers–2. Material Study on the Produced Copolymers." Polymers 12, no. 6: 1.
Extremophilic microorganisms are considered being very promising candidates for biotechnological production of various products including polyhydroxyalkanoates (PHA). The aim of this work was to evaluate the PHA production potential of a novel PHA-producing thermophilic Gram-positive isolate Aneurinibacillus sp. H1. This organism was capable of efficient conversion of glycerol into poly(3-hydroxybutyrate) (P3HB), the homopolyester of 3-hydroxybutyrate (3HB). In flasks experiment, under optimal cultivation temperature of 45 °C, the P3HB content in biomass and P3HB titers reached 55.31% of cell dry mass and 2.03 g/L, respectively. Further, the isolate was capable of biosynthesis of PHA copolymers and terpolymers containing high molar fractions of 3-hydroxyvalerate (3HV) and 4-hydroxybutyrate (4HB). Especially 4HB contents in PHA were very high (up to 91 mol %) when 1,4-butanediol was used as a substrate. Based on these results, it can be stated that Aneurinibacillus sp. H1 is a very promising candidate for production of PHA with tailored material properties.
Iva Pernicova; Ivana Novackova; Petr Sedlacek; Xenie Kourilova; Michal Kalina; Adriana Kovalcik; Martin Koller; Jana Nebesarova; Vladislav Krzyzanek; Kamila Hrubanova; Jiri Masilko; Eva Slaninova; Stanislav Obruca. Introducing the Newly Isolated Bacterium Aneurinibacillus sp. H1 as an Auspicious Thermophilic Producer of Various Polyhydroxyalkanoates (PHA) Copolymers–1. Isolation and Characterization of the Bacterium. Polymers 2020, 12, 1235 .
AMA StyleIva Pernicova, Ivana Novackova, Petr Sedlacek, Xenie Kourilova, Michal Kalina, Adriana Kovalcik, Martin Koller, Jana Nebesarova, Vladislav Krzyzanek, Kamila Hrubanova, Jiri Masilko, Eva Slaninova, Stanislav Obruca. Introducing the Newly Isolated Bacterium Aneurinibacillus sp. H1 as an Auspicious Thermophilic Producer of Various Polyhydroxyalkanoates (PHA) Copolymers–1. Isolation and Characterization of the Bacterium. Polymers. 2020; 12 (6):1235.
Chicago/Turabian StyleIva Pernicova; Ivana Novackova; Petr Sedlacek; Xenie Kourilova; Michal Kalina; Adriana Kovalcik; Martin Koller; Jana Nebesarova; Vladislav Krzyzanek; Kamila Hrubanova; Jiri Masilko; Eva Slaninova; Stanislav Obruca. 2020. "Introducing the Newly Isolated Bacterium Aneurinibacillus sp. H1 as an Auspicious Thermophilic Producer of Various Polyhydroxyalkanoates (PHA) Copolymers–1. Isolation and Characterization of the Bacterium." Polymers 12, no. 6: 1235.
This work deals with the influence of zinc on cement hydration. The amount of zinc in cement has increased over recent years. This is mainly due to the utilization of solid waste and tires, which are widely used as a fuel in a rotary kiln. Zinc can also be introduced to cement through such secondary raw materials as slag, due to increased recycling of galvanized materials. The aim of this work was to determine the effect of zinc on the hydration of Portland cement, blended with ground blast furnace slag (GBFS). This effect was studied by isothermal and isoperibolic calorimetry. Both calorimetry methods are suitable for measurements during the first days of hydration. Isoperibolic calorimetry monitors the hydration process in real-life conditions, while isothermal calorimetry does so at a defined chosen temperature. Zinc was added to the cement in the form of two soluble salts, namely Zn(NO3)2, ZnCl2, and a poorly soluble compound, ZnO. The concentration of added zinc was chosen to be 0.05, 0.1, 0.5, and 1mass percent. The amount of GBFS replacement was 15% of cement dosage. The newly formed hydration products were identified by X-ray diffraction method (XRD).
Pavel Šiler; Iva Kolářová; Radoslav Novotný; Jiří Másilko; Jan Bednárek; Martin Janča; Jan Koplík; Jan Hajzler; Lukáš Matějka; Michal Marko; Přemysl Pokorný; Tomáš Opravil; František Šoukal. Application of Isothermal and Isoperibolic Calorimetry to Assess the Effect of Zinc on Hydration of Cement Blended with Slag. Materials 2019, 12, 2930 .
AMA StylePavel Šiler, Iva Kolářová, Radoslav Novotný, Jiří Másilko, Jan Bednárek, Martin Janča, Jan Koplík, Jan Hajzler, Lukáš Matějka, Michal Marko, Přemysl Pokorný, Tomáš Opravil, František Šoukal. Application of Isothermal and Isoperibolic Calorimetry to Assess the Effect of Zinc on Hydration of Cement Blended with Slag. Materials. 2019; 12 (18):2930.
Chicago/Turabian StylePavel Šiler; Iva Kolářová; Radoslav Novotný; Jiří Másilko; Jan Bednárek; Martin Janča; Jan Koplík; Jan Hajzler; Lukáš Matějka; Michal Marko; Přemysl Pokorný; Tomáš Opravil; František Šoukal. 2019. "Application of Isothermal and Isoperibolic Calorimetry to Assess the Effect of Zinc on Hydration of Cement Blended with Slag." Materials 12, no. 18: 2930.
D Beranova; L Galvankova; Jiří Másilko; P Ptacek. The products of a high temperature reaction of fly ash with lime and soda. IOP Conference Series: Materials Science and Engineering 2019, 583, 1 .
AMA StyleD Beranova, L Galvankova, Jiří Másilko, P Ptacek. The products of a high temperature reaction of fly ash with lime and soda. IOP Conference Series: Materials Science and Engineering. 2019; 583 ():1.
Chicago/Turabian StyleD Beranova; L Galvankova; Jiří Másilko; P Ptacek. 2019. "The products of a high temperature reaction of fly ash with lime and soda." IOP Conference Series: Materials Science and Engineering 583, no. : 1.
P Siler; I Kolarova; J Bednarek; M Janca; Jiří Másilko; Radoslav Novotný; T Opravil. The effect of zinc, water to binder ratio and silica fume on the hydration and mechanical properties of Portland cement mixtures. IOP Conference Series: Materials Science and Engineering 2019, 583, 1 .
AMA StyleP Siler, I Kolarova, J Bednarek, M Janca, Jiří Másilko, Radoslav Novotný, T Opravil. The effect of zinc, water to binder ratio and silica fume on the hydration and mechanical properties of Portland cement mixtures. IOP Conference Series: Materials Science and Engineering. 2019; 583 ():1.
Chicago/Turabian StyleP Siler; I Kolarova; J Bednarek; M Janca; Jiří Másilko; Radoslav Novotný; T Opravil. 2019. "The effect of zinc, water to binder ratio and silica fume on the hydration and mechanical properties of Portland cement mixtures." IOP Conference Series: Materials Science and Engineering 583, no. : 1.
M Marko; T Opravil; Jiří Másilko; Jaromir Porizka. Possibilities of fly ash activation in alumina recovery process. IOP Conference Series: Materials Science and Engineering 2019, 583, 1 .
AMA StyleM Marko, T Opravil, Jiří Másilko, Jaromir Porizka. Possibilities of fly ash activation in alumina recovery process. IOP Conference Series: Materials Science and Engineering. 2019; 583 ():1.
Chicago/Turabian StyleM Marko; T Opravil; Jiří Másilko; Jaromir Porizka. 2019. "Possibilities of fly ash activation in alumina recovery process." IOP Conference Series: Materials Science and Engineering 583, no. : 1.
Jakub Palovčík; T Opravil; F Soukal; Jiří Másilko. Hydrothermal reaction products of brick recyclates. IOP Conference Series: Materials Science and Engineering 2019, 583, 1 .
AMA StyleJakub Palovčík, T Opravil, F Soukal, Jiří Másilko. Hydrothermal reaction products of brick recyclates. IOP Conference Series: Materials Science and Engineering. 2019; 583 ():1.
Chicago/Turabian StyleJakub Palovčík; T Opravil; F Soukal; Jiří Másilko. 2019. "Hydrothermal reaction products of brick recyclates." IOP Conference Series: Materials Science and Engineering 583, no. : 1.
P Hruby; Lukas Kalina; Jiří Másilko; M Kimm; T Gries. Utilization of basalt fabrics as reinforcement for alkali-activated blast furnace slag systems. IOP Conference Series: Materials Science and Engineering 2019, 583, 1 .
AMA StyleP Hruby, Lukas Kalina, Jiří Másilko, M Kimm, T Gries. Utilization of basalt fabrics as reinforcement for alkali-activated blast furnace slag systems. IOP Conference Series: Materials Science and Engineering. 2019; 583 ():1.
Chicago/Turabian StyleP Hruby; Lukas Kalina; Jiří Másilko; M Kimm; T Gries. 2019. "Utilization of basalt fabrics as reinforcement for alkali-activated blast furnace slag systems." IOP Conference Series: Materials Science and Engineering 583, no. : 1.
The present study reports the effect of phosphorus content in deposited electroless nickel (Ni–P) coatings, the heat treatment on the microhardness and its microstructural characteristics, and the influence of the temperature on the microstructure of the Mg alloy substrate during the heat treatment. The deposition of Ni–P coatings was carried out in the electroless nickel bath, and the resulting P content ranged from 5.2 to 10.8 wt.%. Prepared samples were heat-treated in the muffle furnace at 400 °C for 1 h after the coating deposition. The cooling of the samples to room temperature was proceeded in the air. For as-deposited and heat-treated samples, it was determined that with the increasing P content, the microhardness was decreasing. This may be caused by the changes in the structure of the Ni–P coating. The X-ray diffraction patterns of the as-deposited Ni–P coatings showed that the microstructure changed their nature from crystalline to amorphous with the increasing P content. The heat treatment of prepared samples led to the significant increase of microhardness of Ni–P coatings. All the heat-treated samples showed the crystalline character, regardless of the P content and the presence of hard Ni3P phase, which can have a positive effect on the increase of microhardness. The metallographic analysis showed changes of substrate microstructure after the heat treatment. The prepared coatings were uniform and with no visible defects.
Martin Buchtík; Michaela Krystýnová; Jiří Másilko; Jaromír Wasserbauer. The Effect of Heat Treatment on Properties of Ni–P Coatings Deposited on a AZ91 Magnesium Alloy. Coatings 2019, 9, 461 .
AMA StyleMartin Buchtík, Michaela Krystýnová, Jiří Másilko, Jaromír Wasserbauer. The Effect of Heat Treatment on Properties of Ni–P Coatings Deposited on a AZ91 Magnesium Alloy. Coatings. 2019; 9 (7):461.
Chicago/Turabian StyleMartin Buchtík; Michaela Krystýnová; Jiří Másilko; Jaromír Wasserbauer. 2019. "The Effect of Heat Treatment on Properties of Ni–P Coatings Deposited on a AZ91 Magnesium Alloy." Coatings 9, no. 7: 461.
Versatile approaches to nanoparticle synthesis offer unprecedented opportunities for the development of optoelectronics, photonics, as well as bio sciences. With the current advancement of hybrid organic-inorganic metal halide perovskites, the next step is to expand their field of applications via utilization of functional and modifiable ligand chemistry. Here, we present a ligand assisted reprecipitation approach for highly luminescent perovskite nanoparticle synthesis using for the first time L-lysine and L-arginine for surface passivation. These nanoparticles exhibit emission within a narrow bandwidth of the visible spectrum and photoluminescence quantum yield close to 100%. Additionally, preferential ligand orientation is achieved via amino acids α-amino group blocking which results in blueshifted emission as well as smaller and more uniform particle size. These experimental results demonstrate the effectiveness of naturally occurring proteinogenic amino acids as surface ligands and offer possibilities for versatile modification of perovskite nanoparticle properties via well-studied amino acid chemistry.
Anna Jancik Prochazkova; Stepan Demchyshyn; Cigdem Yumusak; Jiří Másilko; Oliver Brüggemann; Martin Weiter; Martin Kaltenbrunner; Niyazi Serdar Sariciftci; Jozef Krajcovic; Yolanda Salinas; Alexander Kovalenko; Oliver Brueggemann. Proteinogenic Amino Acid Assisted Preparation of Highly Luminescent Hybrid Perovskite Nanoparticles. ACS Applied Nano Materials 2019, 2, 4267 -4274.
AMA StyleAnna Jancik Prochazkova, Stepan Demchyshyn, Cigdem Yumusak, Jiří Másilko, Oliver Brüggemann, Martin Weiter, Martin Kaltenbrunner, Niyazi Serdar Sariciftci, Jozef Krajcovic, Yolanda Salinas, Alexander Kovalenko, Oliver Brueggemann. Proteinogenic Amino Acid Assisted Preparation of Highly Luminescent Hybrid Perovskite Nanoparticles. ACS Applied Nano Materials. 2019; 2 (7):4267-4274.
Chicago/Turabian StyleAnna Jancik Prochazkova; Stepan Demchyshyn; Cigdem Yumusak; Jiří Másilko; Oliver Brüggemann; Martin Weiter; Martin Kaltenbrunner; Niyazi Serdar Sariciftci; Jozef Krajcovic; Yolanda Salinas; Alexander Kovalenko; Oliver Brueggemann. 2019. "Proteinogenic Amino Acid Assisted Preparation of Highly Luminescent Hybrid Perovskite Nanoparticles." ACS Applied Nano Materials 2, no. 7: 4267-4274.
Dyckerhoff cement was substituted by 15 mass% of silica fume (SF), metakaolin (MK), ground granulated blast-furnace slag (BFS) or their combination. Phase changes and their impact on porous structure and compressive strength were investigated from 7 up to 28 days of hydrothermal curing at 165 °C and 0.6 MPa. Since the amount of jaffeite did not change significantly with prolongation of autoclaving time, ongoing coarsening of structure resulting in substantial increase of permeability coefficient and decrease of compressive strength depended mainly on the increasing quantity of α-C2SH. The most significant negative changes were demonstrated in referential samples as well as samples containing BFS. Any of the undesired phases were evidenced in the composition prepared with SF. Particular samples showed character of structure and compressive strength comparable or even better than corresponding samples cured under standard conditions.
Eva Kuzielová; Matúš Žemlička; Jiří Másilko; Martin T. Palou. Development of G-oil well cement phase composition during long therm hydrothermal curing. Geothermics 2019, 80, 129 -137.
AMA StyleEva Kuzielová, Matúš Žemlička, Jiří Másilko, Martin T. Palou. Development of G-oil well cement phase composition during long therm hydrothermal curing. Geothermics. 2019; 80 ():129-137.
Chicago/Turabian StyleEva Kuzielová; Matúš Žemlička; Jiří Másilko; Martin T. Palou. 2019. "Development of G-oil well cement phase composition during long therm hydrothermal curing." Geothermics 80, no. : 129-137.
This work is focused on an approach to improve the impact toughness of poly (lactic acid) (PLA) without compromising the bio-based carbon content and compostability of PLA. According to the literature, low-crystallinity and amorphous polyhydroxyalkanoates (PHA) copolymers were demonstrated to be very effective in improving the toughness of PLA at modest loading levels of 10-20 weight percent. The present study includes preparation and characterization of PLA/PHA blends with two different amorphous PHA copolymers. Another strategy for improvement of the impact performance of the prepared PLA/PHA blends was applying an annealing procedure after injection molding. Crystalline morphology and crystal modification before and after the annealing process of all prepared PLA/PHA blends as well as for the virgin PLA were studied by X-ray diffraction measurements. In the present study, an outstanding impact performance was achieved in the case of PLA/PHA2 blends.
Ivana Burzic; Claudia Pretschuh; Dominik Kaineder; Gerhard Eder; Jiří Smilek; Jiří Másilko; Wöss Kateryna. Impact modification of PLA using biobased biodegradable PHA biopolymers. European Polymer Journal 2019, 114, 32 -38.
AMA StyleIvana Burzic, Claudia Pretschuh, Dominik Kaineder, Gerhard Eder, Jiří Smilek, Jiří Másilko, Wöss Kateryna. Impact modification of PLA using biobased biodegradable PHA biopolymers. European Polymer Journal. 2019; 114 ():32-38.
Chicago/Turabian StyleIvana Burzic; Claudia Pretschuh; Dominik Kaineder; Gerhard Eder; Jiří Smilek; Jiří Másilko; Wöss Kateryna. 2019. "Impact modification of PLA using biobased biodegradable PHA biopolymers." European Polymer Journal 114, no. : 32-38.
Lukas Kalina; V. Bílek Jr.; M. Bušo; J. Koplík; Jiří Másilko. Thickness determination of corrosion layers on iron using XPS depth profiling. Materiali in tehnologije 2018, 52, 537 -540.
AMA StyleLukas Kalina, V. Bílek Jr., M. Bušo, J. Koplík, Jiří Másilko. Thickness determination of corrosion layers on iron using XPS depth profiling. Materiali in tehnologije. 2018; 52 (5):537-540.
Chicago/Turabian StyleLukas Kalina; V. Bílek Jr.; M. Bušo; J. Koplík; Jiří Másilko. 2018. "Thickness determination of corrosion layers on iron using XPS depth profiling." Materiali in tehnologije 52, no. 5: 537-540.
Cement kiln by-pass dust (CKD) is a fine-grained by-product of Portland clinker manufacturing. Its chemical composition is not suitable for returning back into feedstock and, therefore, it has to be discharged. Such an increasing waste production contributes to the high environmental impact of the cement industry. A possible solution for the ecological processing of CKD is its incorporation into alkali-activated blast furnace slag binders. Thanks to high alkaline content, CKD serves as an effective accelerator for latent hydraulic substances which positively affect their mechanical properties. It was found out that CKD in combination with sodium carbonate creates sodium hydroxide in situ which together with sodium water glass content increases the dissolution of blast furnace slag particles and subsequently binder phase formation resulting in better flexural and compressive strength development compared to the sample without it. At the same time, the addition of CKD compensates the autogenous shrinkage of alkali-activated materials reducing the risk of material cracking. On the other hand, this type of inorganic admixture accelerates the hydration process causing rapid loss of workability.
Lukáš Kalina; Jr. Vlastimil Bílek; Tomáš Kiripolský; Radoslav Novotný; Jiří Másilko. Cement Kiln By-Pass Dust: An Effective Alkaline Activator for Pozzolanic Materials. Materials 2018, 11, 1770 .
AMA StyleLukáš Kalina, Jr. Vlastimil Bílek, Tomáš Kiripolský, Radoslav Novotný, Jiří Másilko. Cement Kiln By-Pass Dust: An Effective Alkaline Activator for Pozzolanic Materials. Materials. 2018; 11 (9):1770.
Chicago/Turabian StyleLukáš Kalina; Jr. Vlastimil Bílek; Tomáš Kiripolský; Radoslav Novotný; Jiří Másilko. 2018. "Cement Kiln By-Pass Dust: An Effective Alkaline Activator for Pozzolanic Materials." Materials 11, no. 9: 1770.
The study deals with the possibility of utilization of fly ashes from coal combustion in refractory materials and its influence on resulting properties of the material. The effect of bed and filter ash addition on the properties of the droplet and the resulting mechanical properties, bulk density, shrinkage and firing temperature of stove fireclay. The subject of this study is also reduction of SO2 emissions evolved burning of fireclay containing fluid ash rich of anhydrite. Emissions of SO2 were observed by TG-DTA method. Characterization of prepared samples and study of heat treatment processes were based on XRD and TG-DTA.
J Kotrla; F Šoukal; Jiří Másilko; J Švec; M Janča. Application of fly ashes from fluid bed coal combustion within refractory materials. IOP Conference Series: Materials Science and Engineering 2018, 379, 012014 .
AMA StyleJ Kotrla, F Šoukal, Jiří Másilko, J Švec, M Janča. Application of fly ashes from fluid bed coal combustion within refractory materials. IOP Conference Series: Materials Science and Engineering. 2018; 379 (1):012014.
Chicago/Turabian StyleJ Kotrla; F Šoukal; Jiří Másilko; J Švec; M Janča. 2018. "Application of fly ashes from fluid bed coal combustion within refractory materials." IOP Conference Series: Materials Science and Engineering 379, no. 1: 012014.