Poly(vinyl alcohol): formulation of a polymer ink for the patterning of substrates with a drop-on-demand inkjet printer

Nowadays, inkjet-printing technology is considered one of the most promising deposition techniques. It allows the highly precise deposition of functional materials to the required place on a substrate and a cost-saving printing process, especially when the drop-on-demand manner is used. Moreover, it represents the perfect technique for the controlled deposition of polymer material, especially for polymer solutions, because of their low viscosity and better process ability. Poly(vinyl alcohol) was chosen because of its versatile application potential; moreover, its compatibility with the human body only increases its usability in bio-applications. The main purpose of this research was to find the appropriate solvent system for poly(vinyl alcohol) and its printability. Solutions with the best properties were printed in pre-defined patterns and personally defined motifs and the printing conditions were optimized in order to obtain patterns with the best possible shape and resolution, which were analysed by optical microscopy.Ministry of Education; Youth and Sports of the Czech Republic - Program NPU I [LO1504]; Internal Grant Agency of Tomas Bata University in Zlin [IGA/CPS/2015/006

Fully inkjet-printed cuo sensor on flexible polymer substrate for alcohol vapours and humidity sensing at room temperature

This work focuses on an inkjet-fabricated sensor based on copper oxide nanostructured particles on polymer flexible substrate for the sensing of alcohol vapours and humidity at room temperature. Nanoparticles were prepared by a microwave-assisted solvothermal sealed vessel synthesis method. The ink composition was developed on the basis of viscosity and surface tension optimization by the addition of polymeric steric surfactant and dispersant. The printing process was optimized with the help of non-dimensional criteria. Silver nanoink was used for the printing of an interdigitated pattern on a PET substrate which was overprinted by the copper oxide ink, thus obtaining a flexible flat sensor. Material design and all fabrication steps of the sensor respected the temperature limitation given by the thermal stability of the polymer substrate. Printed layers and motifs were characterized microscopically and by resistance measurement. The effectiveness of the prepared sensor was demonstrated and studied by measuring the response to saturated vapours at room temperature. The sensing layer showed the opposite resistance response to stimuli than expected for the well-known p-type sensing mechanism of CuO sensors operated at high temperatures. In addition to vapour sorption, condensation and desorption influencing electron, proton and ionic conductivity, manifestation of another mechanism was observed and an explanation suggested in terms of the electrochemical mechanism. © 2019 by the authors. Licensee MDPI, Basel, Switzerland.Ministry of Education, Youth and Sports of the Czech Republic-Program NPU I [LO1504]; Internal Grant Agency of Tomas Bata University in Zlin [IGA/CPS/2015/006, IGA/CPS/2016/007, IGA/CPS/2017/008

Electrochemical characterization of leached steel-making sludge

In this work, the electrochemical properties of the leached sludge, magnetite and zinc ferrite were studied. Acetic acid was used as a leaching reagent because, in recent years, there has been a surge of interest in using zinc-containing materials as photocatalysts, with acetic acid finding application in their preparation. Various methodological approaches were used, but the best results were achieved with a combination of 1-3 h leaching in 0.01 M acetic acid with a solid/liquid ratio of 500. In this arrangement, zincite was almost completely removed from the sludge, while zinc ferrite and magnetite remained in the solid residue. Ex situ analyses of the main leaching products were performed by X-ray diffraction, infrared spectroscopy, and thermogravimetry. The electrochemical behaviour of solid residue and model systems, that are micromagnetite and zinc ferrite, was studied in alkaline media by means of modified carbon paste electrodes, cyclic voltammetry, and chronocoulometry, with a suitable potential window ranging from 0 to 1.5 V. In summary, a linear dependence of the anodic and cathodic peak height on the square root of the scan rate was found. The position of the anodic and cathodic peaks shifted slightly with scan rate, only at low rates, up to 25 mV/s, the individual peaks coincided. The electrochemical response suggested a quasireversible process.Web of Science121art. no. 1669

Water-based indium tin oxide nanoparticle ink for printed toluene vapours sensor operating at room temperature

This study is focused on the development of water-based ITO nanoparticle dispersions and ink-jet fabrication methodology of an indium tin oxide (ITO) sensor for room temperature operations. Dimensionless correlations of material-tool-process variables were used to map the printing process and several interpretational frameworks were re-examined. A reduction of the problem to the Newtonian fluid approach was applied for the sake of simplicity. The ink properties as well as the properties of the deposited layers were tested for various nanoparticles loading. High-quality films were prepared and annealed at different temperatures. The best performing material composition, process parameters and post-print treatment conditions were used for preparing the testing sensor devices. Printed specimens were exposed to toluene vapours at room temperature. Good sensitivity, fast responses and recoveries were observed in ambient air although the n-type response mechanism to toluene is influenced by moisture in air and baseline drift was observed. Sensing response inversion was observed in an oxygen and moisture-free N2 atmosphere which is explained by the charge-transfer mechanism between the adsorbent and adsorbate molecules. The sensitivity of the device was slightly better and the response was stable showing no drifts in the protective atmosphere. © 2018 by the authors. Licensee MDPI, Basel, Switzerland.CZ.1.05/2.1.00/19.0409; IGA/CPS/2015/006; IGA/CPS/2017/008; IGA/CPS/2016/007; LO1504, NPU, Northwestern Polytechnical University; FEDER, European Regional Development Fund; MŠMT, Ministerstvo Školství, Mládeže a Tělovýchovy; FEDER, European Regional Development Fund; Research and DevelopmentMinistry of Education, Youth and Sports of the Czech Republic-Program NPU I [LO1504]; Operational Program Research and Development for Innovations; European Regional Development Fund (ERDF); national budget of Czech Republic [CZ.1.05/2.1.00/19.0409]; Internal Grant Agency of Tomas Bata University in Zlin [IGA/CPS/2015/006, IGA/CPS/2016/007, IGA/CPS/2017/008

The Family House - The Heating

Import 03/08/2012Cílem této bakalářské práce je navrhnout vytápění v rodinném domě, kde je kladen důraz na efektivnost a tepelnou pohodu uvnitř objektu. Dále byly zváženy nynější požadavky na energetickou náročnost budov a také vliv stavby na životní prostředí. Z těchto hledisek, jsem se rozhodl navrhnout vytápění pomocí tepelného čerpadla země – voda, kde zdrojem energie bude hlubinný vrt. Součástí tohoto projektu je výkresová dokumentace a technická zpráva stavební časti, dále pak výkresová dokumentace a technická zpráva části vytápění a přílohy, kde jsou uvedeny všechny důležité výpočty. Výsledný návrh splňuje požadavky všech současných norem ČSN a EN.The aim of this thesis is to design a heating system in a family house where the emphasis is on efficiency and thermal comfort inside the building. Were also considered the current requirements for buildings and structures impact on the environment. From these considerations, I decided to design a heating using heat pumps earth - water, where the source of energy will be deep borehole. The project includes the design documentation and technical report part of the building, as well as drawings and technical report of the heating and the Annex, which lists all important calculations. The resulting design meets all current standards BS and EN standardsPrezenční229 - Katedra prostředí staveb a TZBvelmi dobř

Optimalization of the beer distribution in Jesenicko

The thesis deals with application of models of routing problems on a real problem, beer distribution in Jesenicko region provided by Viden plus, a.s. The goal of the thesis is to optimize daily distributional routes for two vehicles with different capacities. Total distance has to be minimized respecting time and capacity limits. In case the optimal solution is not found, sub-optimal solution will be accepted. Solutions are calculated with use of the optimization software LINGO and some heuristic methods. Models of travelling salesman problem and vehicle routing problem are used to find the solutions. Results are compared to the current state of distributional routes in conclusion of the thesis

Praktická aplikace rozšířeného kontejnerového dopravního problému pro přepravu velkoobjemového zboží

The thesis concerning practical application of a container transport problem in a case of a company trading kitchen appliances, concretely optimizing costs of the transport of goods from three warehouses to five stores with four different types of cars

Praktická aplikace rozšířeného kontejnerového dopravního problému pro přepravu velkoobjemového zboží

The thesis concerning practical application of a container transport problem in a case of a company trading kitchen appliances, concretely optimizing costs of the transport of goods from three warehouses to five stores with four different types of cars.Práce se týká praktické aplikace kontejnerového dopravního problému v podání firmy obchodující kuchyňskými spotřebiči, konkrétně optimalizace nákladů při zavážení zboží ze skladů do obchodů pomocí čtyř typů automobilů

The Boarding House - The Heating and Ventilation

Import 04/02/2014Diplomová práce, vedoucí diplomové práce Ing. Zdeněk Galda, Ph.D. Tématem této diplomové práce bylo navrhnout a vypracovat projektovou dokumentaci vytápění a větrání pro novostavbu penzionu. Cílem této práce je návrh, který bude splňovat požadavky současných norem ČR a zároveň požadavky na zachování tepelné pohody a komfortního stavu vnitřního prostředí. Stavební část byla zpracována v rozsahu potřeb TZB. Účelem stavby je poskytování ubytovacích a stravovacích služeb. Jako hlavní zdroj tepla pro vytápění byl navržen plynový kondenzační kotel, který v kombinaci s podlahovým vytápěním zajišťuje tepelnou pohodu v ubytovací části penzionu. Ve stravovací části je navržen systém řízeného větrání s rekuperací tepla pomocí vzduchotechnické jednotky.The topic of this thesis was to design and develop project documentation heating and ventilation systems for new build house. The aim of this work is a proposal that will meet the current standards of CR and requirements to maintain thermal comfort and comfortable indoor environment. Construction work was undertaken within the range of needs TZB. The purpose of the construction is the provision of accommodation and food services. As the main source of heat for heating was designed gas condensing boiler, which in combination with underfloor heating provides thermal comfort in the accommodation of the house. The eating part is designed controlled ventilation system with heat recovery air handling units using.Prezenční229 - Katedra prostředí staveb a TZBvelmi dobř