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Study of angular and time characteristics of suspensions by using of elastic scattering
Peikertová, Pavlína ; Kočišová, Eva (advisor) ; Holoubek, Aleš (referee)
Elastic light scattering represents relatively simple and noninvasive technique to study angular dependencies of the scattered light intensity that contains important information about scattering objects. In the frame of this thesis the data from adapted computer controlled apparatus Photo-gonio-diffusometre type 42.000 were collected. Experimental set-up was upgraded to use it for small sample volumes. Two model systems were studied: polymer and latex suspensions and real systems: liposomal suspension of various sizes, as well. The size estimation by using of Guinier plot was performed from experimental data. This estimation is in good agreement with the defined sizes in case of model systems. For suspensions of liposomes the results are also in relatively good agreement with expected values. Aggregation process and subsequent sedimentation after addition of porphyrin CuTMPyP4 was observed for silver borohydrid colloid. Acquired time and angular dependencies were processed by factor analysis that is able to make a qualitative and temporal separation of both processes
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Study of angular and time characteristics of suspensions by using of elastic scattering
Peikertová, Pavlína ; Kočišová, Eva (advisor) ; Holoubek, Aleš (referee)
Elastic light scattering represents relatively simple and noninvasive technique to study angular dependencies of the scattered light intensity that contains important information about scattering objects. In the frame of this thesis the data from adapted computer controlled apparatus Photo-gonio-diffusometre type 42.000 were collected. Experimental set-up was upgraded to use it for small sample volumes. Two model systems were studied: polymer and latex suspensions and real systems: liposomal suspension of various sizes, as well. The size estimation by using of Guinier plot was performed from experimental data. This estimation is in good agreement with the defined sizes in case of model systems. For suspensions of liposomes the results are also in relatively good agreement with expected values. Aggregation process and subsequent sedimentation after addition of porphyrin CuTMPyP4 was observed for silver borohydrid colloid. Acquired time and angular dependencies were processed by factor analysis that is able to make a qualitative and temporal separation of both processes
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Catalytic Activity of Cobalt Impregnated on Ordered Mesoporous Silica Materials in N2O Decomposition.
Kuboňová, L. ; Fridrichová, D. ; Peikertová, P. ; Mamulová Kutláková, K. ; Kozubová, S. ; Jirátová, Květa ; Obalová, L. ; Cool, P.
Three different ordered mesoporous silica materials, such as MCM-41, Al containing MCM-41 (mass ratio Si/Al = 10) and SBA-15, were prepared. In a next step, cobalt (5-8 wt%) as an active metal for redox reactions, was introduced by the impregnation. The prepared catalysts were characterized by AAS, EDX, N-2 physisorption, XRD, DR UV-Vis spectroscopy, Raman spectroscopy, TPR-H-2 and their catalytic properties were evaluated for N2O decomposition and reduction. The catalysts showed poor activity in N2O decomposition while the use of reducing agent (carbon monoxide) was beneficial for their catalytic activities. The lowest catalytic activity showed Co/Al-MCM indicating that the aggregated CoxOy species present in this catalyst were inactive and not beneficial for the catalytic activity.
Fulltext: content.csg -  PDF
Plný tet: NANOCON 2015 - PDF
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