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Collection's Items (Sorted by Submit Date in Descending order): 1 to 11 of 11
Remiš, Tomáš , Bělský, Petr , Andersen, Shuang Ma , Tomáš, Martin , Kadlec, Jaroslav , Kovářík, Tomáš
Preparation and Characterization of Poly(Vinyl Alcohol) (PVA)/SiO2, PVA/Sulfosuccinic Acid (SSA) and PVA/SiO2/SSA Membranes: A Comparative Study

Vakili, Mohammadtaghi , Mojiri, Amin , Zwain, Haider M. , Yuan, Jing , Giwa, Abdulmoseen Segun , Wang, Wei , Gholami, Fatemeh , Guo, Xiaogang , Cagnetta, Giovanni , Yu, Gang
Effect of beading parameters on cross-linked chitosan adsorptive properties

Among countless applications, chitosan has the potential to be an effective and cheap adsorbent for pollutant removal in (waste) water. In form of beads, it also exhibits good mechanical and fluid dynamic properties that are suitable for utilization in large-scale adsorption processes (...

Sadasivuni, Kishor Kumar , Saha, Prosenjit , Adhikari, Jaideep , Deshmukh, Kalim Abdul Rashid , Ahamed, M. Basheer , Cabibihan, John-John
Recent advances in mechanical properties of biopolymer composites: a review

In recent years, biopolymers are getting wide attention with the perspective of developing high-performance biocomposites with low environmental impact owing to their unique and useful features such as abundant availability, renewability, ecofriendliness and lightweight. Biopolymer composites are expected ...

Šesták, Jaroslav
Ignoring heat inertia impairs accuracy of determination of activation energy in thermal analysis

This paper critically analyzes the traditional method of kinetic determination of activation energy by sectioning the recorded differential thermal analysis peak area. This procedure is incorrect because it misses the impact of thermal inertia, which changes the shape of the peak's base&...

Novotný, Pavel , Tomáš, Martin , Němec, Tomáš , Kullová, Lucie , Maršík, František
On/off cycling test of low-temperature PEM fuel cell at fully humidified conditions

Accelerated stress testing is one of the most used approaches to characterize the performance and the degradation of the membrane electrode assembly (MEA) in low-temperature hydrogen polymer electrolyte membrane fuel cells (PEMFC). A standard JRC on/off testing procedure was used to cha...

Maršík, František , Weigand, Bernhard , Tomáš, Martin , Tuček, Ondřej , Novotný, Pavel
On the Efficiency of Electrochemical Devices from the Perspective of Endoreversible Thermodynamics

The current work presents a concept that deals with the production of entropy generated by nonequilibrium processes in consequence of mass and energy transfer. The often used concept of endoreversible thermodynamics is based on thenon-realistic conjecture that the entire entropy production i...

Tomáš, Martin , Remiš, Tomáš , Gholami, Fatemeh
The determination of effective diffusion coefficient from the electrochemical impedance spectra of composite poly (vinyl alcohol) membranes

This study presents the effect of swelling on effective diffusion coefficient of the composite poly(vinyl alcohol) (PVA) membranes through electrochemical impedance spectroscopy. The PVA based membranes were cross‐linked by sulfosuccinic acid (SSA) or tetraethylorthosilicate (TEOS) to improve the ionic...

Vála, Lukáš , Medlín, Rostislav , Koštejn, Martin , Karatodorov, Stefan , Jandová, Věra , Vavruňková, Veronika , Křenek, Tomáš
Laser-Induced Reactive Deposition of Nanostructured CoS2- and Co2CuS4-Based Films with Fenton Catalytic Properties

Highly polymorphic cobalt sulfide represents attractive material because of its unique electronic, optical, magnetic, mechanical and catalytic properties. Pulsed laser irradiation of a solid CoS2 target results in ablation and deposition of thin films on Ta and Cu substrate, which were analy...

Šesták, Jaroslav
Are nonisothermal kinetics fearing historical Newton's cooling law, or are just afraid of inbuilt complications due to undesirable thermal inertia?

Relations between the magnitude of the change of the ratios of crystallization and melting temperature with glass transition temperature, that is Tc/Tg and Tm/Tg, determine the order of the values of relative change of glass stability (GS) parameters dKH/KH, dKW/KW and dK...

Holba, Pavel
Teplotní závislost aktivační energie endotermických procesů a odpovídající nepřesnost kinetických vyhodnocování

The of observed dependences between activation energy and equilibrium temperature of process is sourced by insufficiency of kinetic equation dα/dt = f(α) Z exp(−E/RT) which ensures no regards to the fact that endothermic (i.e. enantiotropic) processes (like melting) can be realized ...

Červinka, Ladislav , Holba, Pavel
Skla na bázi CdAs2: vztah k rovnovážným krystalickým fázím

An attempt is made to correlate some results obtained during the investigation of glasses of CdXxAs2 systems. It is pointed out that CdAs2 has a unique position among the other di-arsenides because of the very short As–As distance. A correlation was found between the region&#x...

Collection's Items (Sorted by Submit Date in Descending order): 1 to 11 of 11