Electrochemical Properties of Mixed Self-Assembled Monolayers Based on Terpyridine Transition Metal Complexes
Kocábová, Jana; Nováková Lachmanová, Štěpánka; Vavrek, František; Valášek, M.; Hromadová, Magdaléna
2023 - English This work presents the electrochemical characterization of mixed self-assembled monolayers\n(SAMs) of [Os(terpy)2]2+ and terpyridine connected by tripodal anchoring groups to the\npolycrystalline gold bead electrode and provides a comparison with SAM based on\n[Os(terpy)2]2+ tripodal molecules without diluting terpyridine tripodal molecules. It is shown\nthat both arrangements enable reproducible preparation of well-defined compact films. The\nelectron transfer rate constant for mixed SAM was determined from cyclic voltammograms\naccording to Laviron’s analysis and compared with the rate constant obtained previously for\nSAM containing only [Os(terpy)2]2+ tripod. Keywords: transition metal complexes; terpyridine; tripodal anchor Available on request at various institutes of the ASCR Electrochemical Properties of Mixed Self-Assembled Monolayers Based on Terpyridine Transition Metal Complexes

This work presents the electrochemical characterization of mixed self-assembled monolayers\n(SAMs) of [Os(terpy)2]2+ and terpyridine connected by tripodal anchoring groups to the\npolycrystalline gold ...

Kocábová, Jana; Nováková Lachmanová, Štěpánka; Vavrek, František; Valášek, M.; Hromadová, Magdaléna
Ústav fyzikální chemie J. Heyrovského, 2023

Elimination Voltammetry with Linear Scan: Advantages and Disadvantages
Navrátil, Tomáš; Trnková, L.; Hrdlička, Vojtěch; Li, X.
2023 - English Elimination voltammetry with linear scan (EVLS) represents an almost traditional\nmathematical method that helps to obtain additional and detailed information about the recorded\nelectrochemical signals and therefore, to better understand the analyzed systems. Although it\nhas been substantially developed and expanded during its existence of more than a quarter of a\ncentury and has found many areas of application, like any other mathematical and experimental\nmethod, it exhibits several advantages and disadvantages. In this contribution, we summarize\nits strengths, weaknesses, opportunities, as well as threats.\n Keywords: elimination voltammetry with linear scan; advantages; disadvantages Available on request at various institutes of the ASCR Elimination Voltammetry with Linear Scan: Advantages and Disadvantages

Elimination voltammetry with linear scan (EVLS) represents an almost traditional\nmathematical method that helps to obtain additional and detailed information about the recorded\nelectrochemical ...

Navrátil, Tomáš; Trnková, L.; Hrdlička, Vojtěch; Li, X.
Ústav fyzikální chemie J. Heyrovského, 2023

Influence of recreational activities on the distribution of forest wild boar rooting
Drimaj, J.; Balková, M.; Špoula, J.; Kamler, J.; Mikulka, O.; Plhal, R.; Homolka, Miloslav
2023 - English The wild boar is a widely distributed and locally very numerous animal. The same is true in the conditions of Central Europe. Outside the growing season, it concentrates in forests, where it also actively searches for food sources. During this activity, it disturbs the soil surface, thereby significantly affecting the dynamics of the ecosystem. From an economic point of view, it limits the natural renewal of tree species, but from an ecological point of view, it changes habitat conditions and thus helps to increase biodiversity. Factors influencing the distribution of rooting across forest stands may be different. In this paper, we focused on the human factor and its influence on the rooting activity of wild boar in the Hodonínská Dúbrava, National natural monuments. Keywords: animal activity; disturbance; diversity; soil surface; wildlife Fulltext is available at external website. Influence of recreational activities on the distribution of forest wild boar rooting

The wild boar is a widely distributed and locally very numerous animal. The same is true in the conditions of Central Europe. Outside the growing season, it concentrates in forests, where it also ...

Drimaj, J.; Balková, M.; Špoula, J.; Kamler, J.; Mikulka, O.; Plhal, R.; Homolka, Miloslav
Ústav biologie obratlovců, 2023

Forest springs, a safe source of drinking water?
Mikuška, Pavel; Alexa, Lukáš; Kouřilová, S.; Cigánková, Hana; Křůmal, Kamil; Itterheimová, Petra; Kubáň, Petr; Matoušek, Tomáš; Barešová, Magdalena; Pivokonský, Martin
2023 - English Water from 25 forest springs was characterized for basic physical parameters and chemical and bacteriological composition. Chemical composition was mostly within limits for drinking water, but bacteriological results indicate faecal pollution of water in majority studied springs. Keywords: spring; forest; chemical pollution; bacteriological contamination Available in digital repository of the ASCR Forest springs, a safe source of drinking water?

Water from 25 forest springs was characterized for basic physical parameters and chemical and bacteriological composition. Chemical composition was mostly within limits for drinking water, but ...

Mikuška, Pavel; Alexa, Lukáš; Kouřilová, S.; Cigánková, Hana; Křůmal, Kamil; Itterheimová, Petra; Kubáň, Petr; Matoušek, Tomáš; Barešová, Magdalena; Pivokonský, Martin
Ústav analytické chemie, 2023

CE-MS separation and identification of standard nucleotides
Butnariu, Maria; Šolínová, Veronika; Koval, Dušan
2022 - English Keywords: capillary electrophoresis; mass spectrometry; nucleotides Available at various institutes of the ASCR CE-MS separation and identification of standard nucleotides

Butnariu, Maria; Šolínová, Veronika; Koval, Dušan
Ústav organické chemie a biochemie, 2022

Mathematical Modeling of Heat and Mass Transfer in a Rotary Kiln
Kozakovič, M.; Čada, J.; Kokavcová, A.; Havlica, Jaromír; Huchet, F.
2022 - English The main objective of this research was to compare the results of the proposed 1D transport model with numerical simulations of mass transport in a direct-heat rotary kiln at laboratory scale. Another objective was to investigate the effect of the number of flights on the formation of an active particle surface in the airborne phase, which enables efficient heat transport. The studied rotary kiln is a low-angle cylinder with a length of 0.5 meter and a diameter of 0.108 meter with regularly arranged flights on the inside. The heat is transported into the rotary kiln by hot air at the inlet. The load in the rotary kiln consists of spherical particles with 1 millimeter diameter. The rotary kiln rotation speed is 21.5 rpm. For each simulation, 20 rotations were performed. The Discrete Element Method implemented in an open-source code LIGGGHTS was used for simulations.Efficient heat transfer is made possible primarily by the large number of particles in the airborne phase, which are heated by the warm air blowing in. To begin with, the number of flights and their geometry were found to be a key parameter controlling the amount of particles in the gaseous regime. It was also found that an area in the right part of the base of the cylinder is formed which is not reached by particles from the flights. This phenomenon is due to the dynamics of particle transport, as the particles are not maintained in the active phase and move rapidly towards the load due to gravity. In conclusion, the effect of this zone is negative, as hot air flows through it without resistance, preventing the system from heating effectively. Keywords: granular dynamics; discrete element method; particulates system; rotary kiln Available in a digital repository NRGL Mathematical Modeling of Heat and Mass Transfer in a Rotary Kiln

The main objective of this research was to compare the results of the proposed 1D transport model with numerical simulations of mass transport in a direct-heat rotary kiln at laboratory scale. Another ...

Kozakovič, M.; Čada, J.; Kokavcová, A.; Havlica, Jaromír; Huchet, F.
Ústav chemických procesů, 2022

Parallel Determination of Particulate Ammonium by Using a Continuous Aerosol Sampler and Cascade Impactor
Alexa, Lukáš; Hlaváčková, H.; Cigánková, Hana; Mikuška, Pavel
2022 - English Ammonia is a significant gaseous pollutant present in the atmosphere. As a neutralizing agent of acidic species ammonia forms particle-phase ammonium (NH4+) salts and contributes thus to formation of secondary atmospheric aerosols (Harrison and Jones, 1995). Aerosols (particulate matter, PM) are responsible for many negative effects on environments and health risks to human. The diameter of PM has significant impact on their environmental exposure, where the decreasing particle size increases the adverse health effects. The ultrafine particles hence play a major role in adverse impact on human health (Ryer-Powder, 1991). Presented paper describes the use of the novel continuous aerosol sampler for online, and a commercial cascade impactor for offline, determination of NH4+ in ambient air. Keywords: ammonium; atmospheric aerosol; online analysis; cascade impactor Available in digital repository of the ASCR Parallel Determination of Particulate Ammonium by Using a Continuous Aerosol Sampler and Cascade Impactor

Ammonia is a significant gaseous pollutant present in the atmosphere. As a neutralizing agent of acidic species ammonia forms particle-phase ammonium (NH4+) salts and contributes thus to formation of ...

Alexa, Lukáš; Hlaváčková, H.; Cigánková, Hana; Mikuška, Pavel
Ústav analytické chemie, 2022

Analysis of textile waste streams in the Czech Republic
Shtukaturova, Anastasia
2022 - English Our results confirm that the Czech Republic is not well prepared to fulfill the ambitious goals of the CEAP in respect to textile waste because of continually growing volumes of this type of the waste and hardly available official data about its production, lack of recycling technologies and obsolete waste collection system.\n Keywords: textile waste streams; analysis; new waste treatment law Available in a digital repository NRGL Analysis of textile waste streams in the Czech Republic

Our results confirm that the Czech Republic is not well prepared to fulfill the ambitious goals of the CEAP in respect to textile waste because of continually growing volumes of this type of the waste ...

Shtukaturova, Anastasia
Ústav chemických procesů, 2022

What happens to microplastics in nature
Spáčilová, Markéta
2022 - English This work was focused on preparation of microplastic particles which correspond to microplastics in the environment. The five most used plastics (polyethylene, polyamide, polytetrafluoroethylene, polyethylene glycol terephthalate, and polystyrene) were used for preparation. Microplastics were prepared by grinding common used plastics to match the actual microplastics present in the environment as closely as possible. The shape and size of the prepared particles\nwere obtained by scanning electron microscopy. Raman and infrared spectroscopy were used to characterize the microplastic structures. Simultaneously, methodology to determine the amount of microplastic particles in simulated water samples was developed. Keywords: microplastic particles; raman spectroscopy; uv degradation Available in a digital repository NRGL What happens to microplastics in nature

This work was focused on preparation of microplastic particles which correspond to microplastics in the environment. The five most used plastics (polyethylene, polyamide, polytetrafluoroethylene, ...

Spáčilová, Markéta
Ústav chemických procesů, 2022

Adaptive synthesis of functional amphiphilic dendrons for drug nanocarrier assembly
Edr, Antonín
2022 - English In this work, an adaptive synthesis of new type of amphiphilic dendrons for nanocarrier purposes will be presented. This methodology was applied in preparation of vast library of substrates. Keywords: symmetrical dendrons; drug nanocarrier assembly; drug delivery Available in a digital repository NRGL Adaptive synthesis of functional amphiphilic dendrons for drug nanocarrier assembly

In this work, an adaptive synthesis of new type of amphiphilic dendrons for nanocarrier purposes will be presented. This methodology was applied in preparation of vast library of substrates.

Edr, Antonín
Ústav chemických procesů, 2022