Národní úložiště šedé literatury Nalezeno 5 záznamů.  Hledání trvalo 0.01 vteřin. 
Metal-organic structures as additives in polyvinylidene fluoride
Pisarenko, Tatiana
This paper describes the synthesis and characterization of the first-ever combination of polyvinylidene fluoride (PVDF) semi-crystalline polymer and iron-based metallic-organic structures (MOF). The resulting specimens were made in the form of thin fibers. It is assumed that thanks to these additives in the form of nanoparticles, the performance of PVDF nanofibers can be enhanced in the future. Both components can currently be considered as emerging materials. This is the initial successful production and presentation of results obtained by electron microscopy (SEM), Raman spectroscopy, and Fourier transform infrared spectroscopy (FTIR). These methods provided a basic overview and compared the differences in sample morphology and different phase conformations between a sample with MOF and a sample without MOF.
Pvdf —AN Ideal Candidate For Use In Nanogenerators
Pisarenko, Tatiana
In this work, the PVDF composite, also known as polyvinylidene fluoride in the formof thin nanofibres, was created. Subsequently, a single-fibre characterization was performed, whichproves its piezoelectric properties and describes its structure. Electron microscopy, atomic forcemicroscopy and X-ray photoelectron spectroscopy were chosen as characterization methods. Thediscussion in this paper deals with the ability of these fibres to use PVDF as a nanogenerator.
Characterization Of Pvdf Nanofibers Created By The Electrospinning Method
Pisarenko, Tatiana
The work investigates structure and properties of composite fibers created by the electrospinning method for piezoapplications. Polyvinylidene fluoride (PVDF) was used as a precursor. As an electrospining parameter, the collector speed of 300 and 2000 rpm was selected, which significantly affects the properties of nanofibers. The structure of fibers was investigated by scanning electron microscopy (SEM) using focused ion beam (FIB). Morphology and piezoelectric domains was observed using piezoresponse force microscopy (PFM). Phase composition was identified using Raman spectroscopy and by Fourier-transform infrared spectroscopy (FTIR). Found results are essential for the design and construction of piezoelectric based structures.
Characterization of PVDF material in nanoscale resolution
Pisarenko, Tatiana ; Dallaev, Rashid (oponent) ; Sobola, Dinara (vedoucí práce)
This work deals with the characterization of nanofibers based on polyvinylidene fluoride. The focus is on the piezoelectric properties of the fiber, which are studied by piezoelectric force microscopy. Thus, two types of different samples were measured, which differed in the fabrication parameters. The differences in the fibers in their phase composition were also investigated using Raman spectroscopy and Fourier-transform infrared spectroscopy. Chemical analysis of the surface and its state was performed using X-ray photoelectron spectroscopy. The different arrangement of the nanofibers together with their cross-section was observed by a scanning electron microscope using focused ion beam. The wettability and contact angle of the surface of the samples with demineralized water were also examined. It was found that the higher speed of the roller during the electrospinning process has a very significant effect on their arrangement and thus on the parameters affecting the formation of the piezoelectric effect and other material properties.
Electronic Circuits for Biomedical Applications
Pisarenko, Tatiana ; Langerová, Petra (oponent) ; Zmrzlá, Petra (vedoucí práce)
The bachelor’s thesis contains an introduction to biomedical signals and the possibilities of processing those signals by electronic circuits. A significant part of the thesis focuses primarily on the description of EMG signal. Also, the thesis comprises diagrams of electrical circuits used primarily for processing of EMG signals. Furthermore, it includes a practical part, in which functions and parameters of a designed circuit are verified in simulator OrCAD Capture.

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