Triboelektriskais efekts polimēru sistēmās: virsmas lādiņa veidošanās un enerģijas savākšana: promocijas darba kopsavilkums
2022
LapcinskisLapčinskis, Linards, Linards
The Thesis will investigate the charge formation and search to verify the role of material transfer in polymer triboelectrification through detection of transferred material by XPS and AFM and contact-separation tests. Since adhesion between surfaces plays an important role in charge formation, TEG devices with increased adhesion will be developed and investigated. The impact of physico-chemical properties on the triboelectric effect will also be investigated in the Thesis that is why tuning of parameters such as cohesive energy density, composite hardness or surface morphology for higher surface charge generation will be studied. The Thesis will also contribute to understanding of aspects that influence the charge formation by investigating triboelectrification of chemically identical materials. Aims of the Thesis: 1. To determine the influence of physico-chemical characteristics of polymer on the surface charge formation. 2. To prove that heterolytic covalent bond scission with material transfer is the principal mechanism responsible for polymer triboelectrification. 3. To investigate the ways to increase polymer triboelectrification tendency. Statements to be defended 1. Charge density generated in polymer triboelectrification correlates with the mechanical properties (e.g., elastic modulus, hardness) and surface roughness of the material allowing the prediction of polymer’s triboelectric properties. 2. Heterolytic scission of covalent bonds is confirmed as a mechanism to explain charge formation in polymer insulator materials. 3. Hybrid ferroelectric-triboelectric nanogenerator devices achieve greater performance when triboelectric dipoles (dipole moment created during triboelectrification) match the direction of the ferroelectric dipoles (dipole present in the ferroelectric phase).
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