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Electrospun fibers based on PVDF and nylon
Černohorský, Petr ; Sobola, Dinara (referee) ; Papež, Nikola (advisor)
Polymer nanofibers used for the construction of triboelectric nanogenerator (TENG) and piezoelectric nanogenerator (PENG) are new and promising technologies for energy recovery. Thanks to the generation of electrical energy based on mechanical movement (deformation), these fibers can find application in the field of self-powered electronic devices. In this work, three nanofibrous structures of materials were prepared by electrostatic spinning: pure polyvinylidene fluoride (PVDF), pure polyamide-6 (PA6) and their mixed combination PVDF / PA6. Non-destructive analyzes such as Raman spectroscopy, FTIR, XPS and electron microscopy were used to study the properties of nanofibers. Analyzes confirmed the positive effect of electrostatic spinning of polymers on the support of the formation of highly polar crystalline -phase in PVDF and , -phase in PA6. The structure arrangement of the nanofibrous material and their defects were observed by scanning electron microscopy (SEM). Furthermore, the contact angle of the wettability of the liquid on the surface was measured for the materials, and the permittivity was measured to monitor the dielectric properties. The described results make the mixed material PVDF / PA6 very promising for further research in the field of nanogenerators and functional textiles.
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3D printed antenna with dielectric lens for free-space material characterization method
Horník, Milan ; Láčík, Jaroslav (referee) ; Kaděra, Petr (advisor)
This bachelor´s thesis deals with the free space setup for material permittivity characterization. The workplace includes two horn antennas, two dielectric lenses and sample holder. The work deals with the characteristic properties of materials such as permittivity and permeability. Further, the methods used to determine permittivity are discussed. The next part of the work is focused on a theoretical analysis of the design of a broadband horn antenna with a dielectric lens. The chapter 3D printing and surface treatment deals with the issue of 3D printing and the possibility of applying a conductive layer on the plastic components. The following section presents the calculated and simulated results performed in CST Microwave Studio. In the next chapter, mechanical construction and measurement setup fabrication are discussed. In the end, the achieved results are evaluated.
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3D printed antenna with dielectric lens for free-space material characterization method
Horník, Milan ; Láčík, Jaroslav (referee) ; Kaděra, Petr (advisor)
This bachelor´s thesis deals with the free space setup for material permittivity characterization. The workplace includes two horn antennas, two dielectric lenses and sample holder. The work deals with the characteristic properties of materials such as permittivity and permeability. Further, the methods used to determine permittivity are discussed. The next part of the work is focused on a theoretical analysis of the design of a broadband horn antenna with a dielectric lens. The chapter 3D printing and surface treatment deals with the issue of 3D printing and the possibility of applying a conductive layer on the plastic components. The following section presents the calculated and simulated results performed in CST Microwave Studio. In the next chapter, mechanical construction and measurement setup fabrication are discussed. In the end, the achieved results are evaluated.
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Electrospun fibers based on PVDF and nylon
Černohorský, Petr ; Sobola, Dinara (referee) ; Papež, Nikola (advisor)
Polymer nanofibers used for the construction of triboelectric nanogenerator (TENG) and piezoelectric nanogenerator (PENG) are new and promising technologies for energy recovery. Thanks to the generation of electrical energy based on mechanical movement (deformation), these fibers can find application in the field of self-powered electronic devices. In this work, three nanofibrous structures of materials were prepared by electrostatic spinning: pure polyvinylidene fluoride (PVDF), pure polyamide-6 (PA6) and their mixed combination PVDF / PA6. Non-destructive analyzes such as Raman spectroscopy, FTIR, XPS and electron microscopy were used to study the properties of nanofibers. Analyzes confirmed the positive effect of electrostatic spinning of polymers on the support of the formation of highly polar crystalline -phase in PVDF and , -phase in PA6. The structure arrangement of the nanofibrous material and their defects were observed by scanning electron microscopy (SEM). Furthermore, the contact angle of the wettability of the liquid on the surface was measured for the materials, and the permittivity was measured to monitor the dielectric properties. The described results make the mixed material PVDF / PA6 very promising for further research in the field of nanogenerators and functional textiles.
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