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Influence of Electrode Preparation on Electrocatalytic Activity of Tetrapyridinoporphyrazinato Cobalt(II) Complex to Propylene
Klusáčková, Monika ; Janda, Pavel ; Tarábková, Hana
The water-soluble complex N ,N' ,N' ',N' "-Tetramethyl-tetra-3,4-pyridinoporphyrazinocobalt (CoTmt-3,4-ppa) has been deposited by different techniques on two substrate. Electrochemical deposition, spontaneous adsorption, and spin coating have been used to the modification of two electrode material: annealed gold as hydrophilic substrate and highly oriented pyrolytic graphite as hydrophobic substrate. The modified electrodes have been characterized using cyclic voltammetry, backscattering VIS spectroscopy and atomic force microscopy. The influence of substrate material and modification techniques on electrocatalytic activity of CoTmt-3,4-ppa modified electrodes for propylene oxidation has been studied.
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Gaseous nanodomains at solid/liquid interface
Janda, Pavel ; Tarábková, Hana ; Klusáčková, Monika
Existence of gaseous nanodomains at solid liquid interface (surface nanobubbles) has been presumed first by Phil Attard and his fellow workers (1) based on discovery of long range attractive forces between two adjacent planar solid surfaces immersed in water. Attard et al. ascribed forces and their discontinuous character to sub-micro bubbles bridging both immersed surfaces.
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Electrocatalytic Oxidation of Unsaturated Hydrocarbons Mediated by Phthalocyanine Derivate
Klusáčková, Monika ; Janda, Pavel
The oxidation of ethylene and propylene respectively, mediated by thin layer -tetramethyltetra-3,4-pyridinoporphyrazinocobalt, simply called CoTmt-3,4-ppa, deposited on basal plane of highly ordered pyrolytic graphite (HOPG) was studied in aqueous phosphate buffer phosphate solution by cyclic voltammetry, backscattering spectroscopy and atomic force microscopy. Our interest has been focused on optimizing conditions of electrocatalytic oxidation unsaturated hydrocarbon on electrode modified by pyridinoporphyrazine.
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Logická tvorba pojmů v rámci Natorpova rozvinutí syntetické funkce rozumu a její vliv na chápání pojmu čísla
Janda, Pavel ; Pavlík, Ján (vedoucí práce) ; Bartoň, Petr (oponent)
Základní linie mé práce je založena na sledování kritického postoje Paula Natorpa k založení formální logiky. Natorp se snaží najít střední cestu mezi psychologismem a odhlížením moderní logiky od založení jednotlivých pojmů, které logika přijímá jako předem dané. Daný úkol se snaží vyřešit navázáním na Kantův systém transcendentální logiky a rozvojem syntetické funkce rozumu, ve které hraje jednu z nejdůležitějších rolí kvantita a číslo. V mé práci si kladu dva úkoly. Zaprvé se snažím podpořit Natorpovu argumentaci o nutnosti zabývat se logickou povahou vzniku pojmů. Druhým úkolem je snaha odvrátit největší nebezpečí celé teorie, které plyne z toho, že i když Natorp psychologismus výslovně odmítl, jeho pojetí syntetické funkce by z pohledu moderní logiky definici psychologismu splňovalo. Proto se snažím ukázat, že některé části Natorpovy teorie mohou být zachovány bez obav z nařčení z psychologismu.
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Electroanalysis with phthalocyanine modified HOPG electrodes
Mansfeldová, Věra ; Janda, Pavel
In this papers we presented modification of highly oriented pyrolitic graphite (HOPG) by two different phthalocyanine (Pc) derivatives and two different deposition techniques. We have investigated electrode modified by fullerene-derived phthalocyanine and cobalt tetraneopentoxyphthalocyanine (CoTNPc) to consider how different modification procedure-electrodeposition and drop evaporation and composition of phthalocyanine influences detection of model compound, L-cysteine.
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New electrochemical cell for studies of phthalocyanines
Hudská, V. ; Janda, Pavel ; Nesměrák, K.
We have developed a new type of electrochemical cell for electrochemical studies of phthalocyanines. The cell employs a HOPG as a working electrode covered by a thin layer of dichlorobenzene with dissolved phthalocyanine. The layer of dichlorobenzene solution is overlaid by aqueous supporting electrolyte solution where the reference and counter microelectrodes are immersed.
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Electrochemical sensor: Mediator Deposition by drop evaporation
Mansfeldová, Věra ; Janda, Pavel ; Tarábková, Hana
Among many different kinds of electrode surface modification procedures, the surface coating by vaporized mediator solution is still used as a simple and effective method for preparation of sensing electrode. Surface of glassy carbon (GC) is often used as a supporting collector, but it requires polishing, rinsing and sonication prior to mediator deposition. In this paper, we present common methods of modification of highly oriented pyrolytic graphite (HOPG) and GC surface, respectively, from the point of surface nanomorphology investigated by atomic force microscopy.
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Electrode coating by chemical mediator: The atomic force microscopy study of surface nanomorphology
Mansfeldová, Věra ; Janda, Pavel ; Tarábková, Hana
Among many different kinds of electrode surface modification procedures, the surface coating by vaporized mediator solution is still as a simple and effective method for preparation of sensing electrode. Surface of glassy carbon (GC) is often used as a supporting collector, but it requires polishing, rinsing and sonication prior to mediator deposition. In this paper, we present common methods of modification of highly oriented pyrolytic graphite (HOPG) and GC surface, respectively, from the point of surface nanomorphology investigated by atomic force microscopy (AFM).
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Electrochemical Applications of SPM
Janda, Pavel
The electrochemical scanning probe microscopy (EC SPM) operates in liguids represented by solutions of electrolytes. This technique requires specific instrumentation and approach different from ex situ SPM or UHV tunneling. Some aspects of in-situ application including both atomic force microscopy and tunneling in liquids are discussed.
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