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Photo-active liquid crystalline materials: effect of lateral substitution far from the chiral center
Mironov, Sergei ; Suchánek, T. ; Marhoul, J. ; Cigl, Martin ; Hamplová, Věra ; Bubnov, Alexej
Photosensitive liquid crystalline (LC) materials give a fascinating possibility to tune and control the optical properties of soft systems distantly by illumination by UV-Vis light. Lateral substitution on the molecular core is an effective tool to tune the behaviour of chiral LCs. The effect of lateral substitution (by F, Cl, Br and methyl group) on the self-assembling behaviour, several new LCs with substituents placed on the benzene ring far from the chiral centre are and studied. All compounds, with exception of Br-substituted one, possess the cholesteric phase. The photosensitive behaviour, in particular the conversion of the E-Z isomers, was studied in toluene solution by HPLC. The kinetics of the photo-isomerization was identified under illumination by UV light. Due to presence of a photo-active azo group these materials can be used as functional dopants for design of smart photo-active liquid crystalline mixtures targeted for various applications in optoelectronics.
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Interests of parties to the Sino-Vietnamese War 1979
Marhoul, Jan ; Karásek, Tomáš (advisor) ; Soukup, Jaromír (referee)
Diploma thesis Interests of parties to the Sino-Vietnamese War 1979 deals with the lesser know topic of the semi-forgotten war which had been fought during the Cold War era. The most interesting in this conflict is, that it had been fought by former mutual allies. The thesis isn't focused on the course of war, with the beginning on the 17th of February 1979. The form of war so called "limited". It means, that the Chinese Peoples Liberation Army, had its objectives, when they had been reached, the Chinese military units turned back to China. The last Chinese soldier crossed the border on the 16th of March 1979, after four week of harsh fighting's. But the aim of this work is to analyze the interests of the parties involved in the conflict and to prove the hypothesis, that the war was actually proxy war between PRC and USSR.
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