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Proceedings of APCE-CECE-ITP-IUPAC 2022
Foret, František ; Lavická, Jana ; Chung, D. S. ; Drobníková, Iveta ; Přikryl, Jan ; Lee, H.
The joint International Interdisciplinary Conference of Chemical Analysis, APCE-CECE-ITP-IUPAC 2022, comprising the 18th Asia Pacific International Symposium on Microscale Separations and Analyses, the 17th International Interdisciplinary Meeting on Bioanalysis, the 28th International Symposium on Electro- and Liquid Phase-Separation Techniques, and IUPAC Special Symposia by Division of Chemistry and the Environment, provided full texts of 108 oral and 54 poster presentations. The attached conference proceedings, edited by highly cited scientists, document the quality of the meeting. Similarly to previous years, the lectures were given by distinguished scientists. The list of speakers as well as more detailed information about the conference can be found on its permanent web at www.ce-ce.org or in the proceedings published in Separations (https://doi.org/10.3390/separations10020109).
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Nanospray processing of silver nanoparticles for formation of dried deposits
Týčová, Anna ; Jonas, Vladimír ; Přikryl, Jan ; Kotzianová, A. ; Velebný, V. ; Foret, František
Nanospray transfers liquid into an aerosol via electrostatic forces created between an emitter and a counter electrode. Herein, we present compact laboratory-made instrumentation for nanospray-processing of silver colloid. The instrumentation is based on the pressurized polysulfone chamber fixing a disposable vial with an immersed platinum electrode and a long fused silica capillary supplying the sprayed liquid to the emitter. The combination of low flow rates (70 nL/min) with a sharp emitter, fabricated on a 3D printed grinding station, resulted in a fine aerosol. The low volume of released droplets allowed full evaporation of water during their flight towards the counter electrode without any need for drying gas or the addition of volatile solvents. The constructed device was successfully used for the deposition of water-free silver colloid without any requirement of its pretreatment. The deposition of completely dried nanoparticles on planar substrates eliminated undesirable coffee ring effect and deposits of increased homogeneity could be obtained. Electron microscopy confirmed no significant changes in the character of nanospray-processed nanoparticles. Finally, we also investigated several approaches for the improvement of the surface density of nanoparticles on the substrate at preserved time scale.
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Study of the influence organic fibres on the fire resistance of concrete
Klobása, Jan ; Přikryl, Jan (referee) ; Sedlmajer, Martin (advisor)
The master thesis is focused on current issues of concrete behaviour under high temperatures. In the theoretical part, a search of knowledge about changes in concrete, which take place when exposed to thermal loads, which simulates the effect of fire, is performed, and summarized. It is also important to summarize the changes in the individual components that are used to produce concrete. This work describes the effect of high temperatures on mechanical and physical properties as well. There is an information about the most used fibres and their function in concrete. Emphasis is placed on describing the possibility of using recycled PET or cellulose fibres due to the positive environmental impact. In the experimental part, recipes with different types and amounts of fibres are proposed. The subject of the research was to determine how individual types and amounts of fibres affect the physical mechanical properties of concrete and their suitability for use at high temperatures. Microscopic scanning and study of changes in the structure of concrete was also performed.
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Issues of experimental determination of concrete moisture
Vaněk, Dominik ; Přikryl, Jan (referee) ; Sedlmajer, Martin (advisor)
This bachelor´s thesis studies issues of moisture determination in concrete. First part describes the relationship between moisture and concrete structure. Second part is dedicated to methodology of concrete moisture determination and also to an own experiment. Main focus of thesis is to evaluate the accuracy and relevance of selected methods of determining the concrete moisture.
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Deposition of dried colloidal suspension via nanoelectrospray
Jonas, Vladimír ; Týčová, Anna ; Přikryl, Jan ; Kotzianová, A. ; Velebný, V. ; Foret, František
Electrospray is a relatively well-established tool for the deposition of nanoparticles. In this work, we use nanoelectrospray (nES) operating at flow rates down to tens of nanoliters per minute. As a result, the formed aerosol consists of very small droplets quickly drying during the flight towards a counter-electrode. Therefore, we obtained deposits of increased homogeneous distribution without an undesirable coffee-ring effect. Moreover, the character of the aerosol plume is only a few millimeters wide, so it allows good control over the deposit localization.
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Návrh úpravy systému nakládání s odpadem v obci do 5000 obyvatel
Přikryl, Jan
The subject of the thesis is to propose a municipal waste management adjustment in the municipality Přibice. The first part of the thesis is concerned with legislative requirements related to the given issue. Following part of the thesis consists of an analysis of the current waste management situation of the municipality, its description and a draft of possible funds for financing the modification of the municipal waste management. Based on results of the analysis a waste-collection centre proposal for bulky waste, hazardous waste and e-waste is formulated aiming at choosing the appropriate number, size and time interval of the pick-up of collecting containers. Within the next step, an adjustment to handle biologically reducible waste by identifying suitable size and number of composters is formulated. In the end of the thesis there are presented current financial resources for making adjustments in the waste management system.
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Surface modification of nanoparticles for sustaining sensitivity of surface-enhanced raman spectrometric measurements in salinated environment
Týčová, Anna ; Přikryl, Jan ; Vaňhara, P. ; Klepárník, Karel ; Foret, František
Surface-enhanced Raman spectrometry (SERS) represents a powerful method for analysis of a broad spectrum of analytes ranging from inorganic ions to biomolecules of high complexity. It combines the potential\nof Raman spectrometry for a definite identification of an analyte with remarkable sensitivity achieved by the surface enhancement effect occurring on metal nanoparticles. While low ionic strength influences positively\nthe sensitivity of the SERS measurement, a higher level of inorganic salts leads to fast ruining of colloidal character, which completely devastates the effect of the surface enhancement. The common stabilization of\nnanoparticles by a layer of polymers has a negative impact on the SERS sensitivity since it shields the nanoparticle surface from the analytes. In this work, we aim at the development of the bi-ligand system of\nnanoparticles surface modification for improved stability of colloid in saline solution at sustaining the potential for sensitive SERS analyses. The proposed system relies on the binding of 3-mercaptopropionic acid and\nthiolated polyethylene glycol in a suitable ratio onto the nanoparticle surfaces. While the short chains of the acid sustain the accessibility of the surface for analytes, the polymeric structures act as a steric barrier\npreventing colloid aggregation.
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Experimental comparison of traffic flow models on traffic data
Přikryl, Jan ; Horňák, Ivan
Despite their deficiencies, continuous second-order traffic flow models are still commonly used to derive discrete-time models that help traffic engineers to model and predict traffic oflow behaviour on highways. We brie fly overview the development of traffic flow theory based on continuous flow-density models of Lighthill-Whitham-Richards (LWR) type, that lead to the second-order model of Aw-Rascle. We will then concentrate on widely-adopted discrete approximation to the LWR model by Daganzo's Cell Transmission Model. Behaviour of the discussed models will be demonstrated by comparing the traffic flow prediction based on these models with real traffic data on the southern highway ring of Prague.
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