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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Studium teplotně citlivých porfyrinů a jejich supramolekulárních komplexů
 Hrubovský, Martin ; Kouřilová, Hana (advisor) ; Srb, Pavel (referee)
Study of thermoresponsive porphyrins and their supramolecular complexes Abstract: We studied the water-soluble artificial compound meso-tetrakis{3,4,5-tris[2-(2-(2- methoxyethoxy)ethoxy)ethoxy]phenyl}porphyrin prepared at NIMS, Japan, using the high-resolution NMR spectroscopy experimental method. We observed its LCST-type phase separation and applied the Flory-Huggins theory of polymer solutions in order to find its phase diagram (binodal and spinodal curves of the phase separation) and we also obtained molar enthalpies, entropies and critical temperatures of its phase separation; from the Flory-Huggins theory we discovered that its molecules form dimers in aqueous solutions. We also studied its host-guest interactions with the S-camphorsulfonic acid; we learned that the porphyrin binds cations and the porphyrin dimers break down when dissolved cations are available for complexation. We observed no phase separation in chloroform. We obtained no proof of the existence of molecular stacks larger than dimers. 1
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Study of the relaxation into a stochastic limit cycle
 Hrubovský, Martin ; Holubec, Viktor (advisor) ; Šomvársky, Ján (referee)
We consider a microscopic two-level system in contact with a heat reservoir. We assume a time-periodic difference between the energies of the two levels. The system dynamics is assumed to be Markovian. From the correspond- ing master equation we calculate the dynamics of such a system in the form of a propagator matrix. Under the assumption of the detailed balance we further calculate the limit cycle probability distribution (which the system will attain after a long time) as an eigenvector of the propagator. We also find a transcen- dental equation for the initial condition that minimizes the entropy production over the first driving period. These two distributions are then expanded in an irreversibility parameter and compared. We discover that up to the first term in the irreversibility parameter (for a slow driving), the Boltzmann equilibrium probability distribution is the average of the limit cycle and entropy minimizing distribution. 1
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