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Preparation and characterization of magnetic nanoparticles modified by surfactants
Solnička, Ondřej ; Másilko, Jiří (referee) ; Enev, Vojtěch (advisor)
Theme of this bachelors thesis was preparation and characterization of iron(II, III) oxide nanoparticles. Those nanoparticles were modified by surfactants. The surfactants which were used for modifiation were CTAB, TTAB and Septonex. Prepared and modified nanoparticles were taken for characterization by using methods of elemental analysis, thermogravimetry, dynamic light scattering and transmission electron microscopy (TEM). Results from each measurement shows that nanoparticles modified by CTAB had on average 85.9 nm in diameter, TTAB size was on average 108.3 nm and the last nanoparticles with Septonex had 246.6 nm in diameter on average. Prepared modified nanoparticles except the Septonex ones were stable enough to not aggregate. Septonex modified nanoparticles had greater tendenty to aggregate.
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Preparation and characterization of magnetic nanoparticles modified by surfactants
Solnička, Ondřej ; Másilko, Jiří (referee) ; Enev, Vojtěch (advisor)
Theme of this bachelors thesis was preparation and characterization of iron(II, III) oxide nanoparticles. Those nanoparticles were modified by surfactants. The surfactants which were used for modifiation were CTAB, TTAB and Septonex. Prepared and modified nanoparticles were taken for characterization by using methods of elemental analysis, thermogravimetry, dynamic light scattering and transmission electron microscopy (TEM). Results from each measurement shows that nanoparticles modified by CTAB had on average 85.9 nm in diameter, TTAB size was on average 108.3 nm and the last nanoparticles with Septonex had 246.6 nm in diameter on average. Prepared modified nanoparticles except the Septonex ones were stable enough to not aggregate. Septonex modified nanoparticles had greater tendenty to aggregate.
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Method Study of Diastereomeric 3-Arylflavins Preparation
Solnička, Ondřej ; Kotoučová, Hana (advisor) ; Budka, Jan (referee)
The presented diploma thesis is built on my bachelor thesis and deals with the study of preparation of ortho-substituted 3-phenylflavins. The target is prepration of 3-ortho-tolylflavin and 3-ortho-tolylflavin-N-oxide and their potential transformation to diastereomeric ortho-substituted flavin-amides or flavin-esters. Obtained substances could be tested as potential catalysts for redox reactions, especially for enantioselective sulfoxidations.
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Method Study of Diastereomeric 3-Arylflavins Preparation
Solnička, Ondřej ; Kotoučová, Hana (advisor) ; Budka, Jan (referee)
The presented diploma thesis is built on my bachelor thesis and deals with the study of preparation of ortho-substituted 3-phenylflavins. The target is prepration of 3-ortho-tolylflavin and 3-ortho-tolylflavin-N-oxide and their potential transformation to diastereomeric ortho-substituted flavin-amides or flavin-esters. Obtained substances could be tested as potential catalysts for redox reactions, especially for enantioselective sulfoxidations.
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