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Materials containing conducting polymers
Blinova, Natalia ; Stejskal, Jaroslav (advisor) ; Pfleger, Jiří (referee) ; Žigon, Majda (referee)
l. Aims of the Thesis The goal of the Thesis is ůeprlaaraiior ..f .'a:ious norpho|ogies produced by conductingpoly.rners, riz. polvaniline (P{\Ji. the.-onrol of ce.n,tu.-:rrrl. a.rC the understanding of the chemistrv of aniline oxidatton. In rhese studies. three ditTerenr drrectiors have been developed. The first pan of the Thesrs rs focused on the slnthesrs of p.{NI. The oprrmum conditions for preparation of all forms available: powders, thin films, and colloidal dispersrons with respect to the morphology' ýeld, and conductiúý have been described. A systematic study of PANI protonated with phosphoric acid as well as a comparative study of the preparation of PANI and polypynole (PPy) have been made. The oxidation of aniline with noble-merals compounds, such as silver nitrate, the effect of the medium acidity, concentration of reacunts and the possible effect of daylight have been invesrigated. A new approach for the synthesis of PANI with separated reactants, aniline and an oxidant, is described in the second part of the Thesis. Various studies have been presented here to investigate the mechanisms of such reactions. The concept of coupled PANl-assisted redox reaction by means oftransport ofelectrons and protons through conducting PANI membrane has been demonstrated. A possible electron-ion-coupled...
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Změny velikostí zlatých nanočástic vysokoenergetickými laserovými pulsy
Dammer, Ondřej ; Pfleger, Jiří ; Šlouf, Miroslav ; Vlčková, B.
We focused on the interaction of gold nanoparticles of various mean size embedded in aqueous environment with nanosecond pulsed laser irradiation of various energy per pulse at wavelength 355 and 532 nm, respectively. We performed a sequence of in-situ surface plasmon extinction (SPE) measurements of the fragmented hydrosol as well as ex-situ TEM studies to evaluate the size distribution of resulting Au nanoparticles. It was found that laser pulses of 355 nm wavelength provide smaller nanoparticles compared with 532 nm pulses at the same absorbed energy.
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