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Diffusivity of humic hydrogels
Král, Jan ; Smilek, Jiří (referee) ; Klučáková, Martina (advisor)
Presented diploma thesis focuses on the study of diffusion of cupric ions in humic acid gels. A total of fifth different standards of humic acids and one sample humic acid prepared from same source as in bachelor's thesis, on which this thesis continues, were used for preparation solutions of humic acids. Thereafter, these solutions were used for preparation of agarose hydrogels, which were necessary in following diffusion experiments. The objective of the work was to compare transport properties of humic standards between themselves and then compare standards with humic acid prepared from same source as in bachelor's thesis. Measure, which was used to determine the transport properties, was comparison of effective diffusion coefficients. Method of instantaneous planar source diffusion was used to compare them. This method was based monitoring temporal evolution of diffusion profiles of cupric ions in humic hydrogels. Copper ions were selected as diffusing medium because of their high affinity and strong bonds to humic acids.
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Utilization of Diffusive Techniques in Study on Reactivity of Biocolloids
Kalina, Michal ; Maršálek, Roman (referee) ; Mráček, Aleš (referee) ; Klučáková, Martina (advisor)
The main aim of this thesis is the utilization of simple diffusion techniques for the study on transport properties of copper ions in the systems containing humic acids with respect to the other parameters, which can affect the process (the structure of diffusion environment, the interactions between transported specie and diffusion matrices, selective blocking of binding sites of humic acids). The first part of experimental works was focused on characterization of studied materials (humic acids, humic sol and humic hydrogel). The main part of the thesis was dealing with the optimization of simple diffusion techniques, which were suitable for the study on transport of copper ions in matrices containing humic acids, taking into account the mutual interactions between studied components in the system. The obtained diffusion characteristics were compared to the data determined using sorption experiments. Consequently, the minor goal of the experimental works of this thesis was also the assessment of the influence of basic physico-chemical parameters of studied materials on transport phenomenon.
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Transport properties of agarose hydrogels
Vlasák, Jan ; Kalina, Michal (referee) ; Klučáková, Martina (advisor)
This thesis deals with the transportation processes of electrolytes using simple organic dyes as diffuse probes. The main goal of the work concerns a study of a diffusion mobility of the selected probes being in a form of simple organic dyes in a hydro-gel matrix based on a thermo-reversible linear polysaccharide, i.e., agaroses, functioning as semi-permeable membranes. The thesis describe diffusion processes used for determination of the basic diffusion parameters such as an efficient diffusion coefficient, reputed diffusion coefficient, separating coefficient, concentration of the dye in a gel and the time needed for the diffusion going throughout the entire layer of the gel. Attention is paid also to the environment in which the diffusion processes are implemented (in particular in view of the gel-like samples), porousness of the structure and its mechanical properties.
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Diffusivity of humic hydrogels
Král, Jan ; Smilek, Jiří (referee) ; Klučáková, Martina (advisor)
Presented diploma thesis focuses on the study of diffusion of cupric ions in humic acid gels. A total of fifth different standards of humic acids and one sample humic acid prepared from same source as in bachelor's thesis, on which this thesis continues, were used for preparation solutions of humic acids. Thereafter, these solutions were used for preparation of agarose hydrogels, which were necessary in following diffusion experiments. The objective of the work was to compare transport properties of humic standards between themselves and then compare standards with humic acid prepared from same source as in bachelor's thesis. Measure, which was used to determine the transport properties, was comparison of effective diffusion coefficients. Method of instantaneous planar source diffusion was used to compare them. This method was based monitoring temporal evolution of diffusion profiles of cupric ions in humic hydrogels. Copper ions were selected as diffusing medium because of their high affinity and strong bonds to humic acids.
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|
|
Utilization of Diffusive Techniques in Study on Reactivity of Biocolloids
Kalina, Michal ; Maršálek, Roman (referee) ; Mráček, Aleš (referee) ; Klučáková, Martina (advisor)
The main aim of this thesis is the utilization of simple diffusion techniques for the study on transport properties of copper ions in the systems containing humic acids with respect to the other parameters, which can affect the process (the structure of diffusion environment, the interactions between transported specie and diffusion matrices, selective blocking of binding sites of humic acids). The first part of experimental works was focused on characterization of studied materials (humic acids, humic sol and humic hydrogel). The main part of the thesis was dealing with the optimization of simple diffusion techniques, which were suitable for the study on transport of copper ions in matrices containing humic acids, taking into account the mutual interactions between studied components in the system. The obtained diffusion characteristics were compared to the data determined using sorption experiments. Consequently, the minor goal of the experimental works of this thesis was also the assessment of the influence of basic physico-chemical parameters of studied materials on transport phenomenon.
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|
|
Transport properties of agarose hydrogels
Vlasák, Jan ; Kalina, Michal (referee) ; Klučáková, Martina (advisor)
This thesis deals with the transportation processes of electrolytes using simple organic dyes as diffuse probes. The main goal of the work concerns a study of a diffusion mobility of the selected probes being in a form of simple organic dyes in a hydro-gel matrix based on a thermo-reversible linear polysaccharide, i.e., agaroses, functioning as semi-permeable membranes. The thesis describe diffusion processes used for determination of the basic diffusion parameters such as an efficient diffusion coefficient, reputed diffusion coefficient, separating coefficient, concentration of the dye in a gel and the time needed for the diffusion going throughout the entire layer of the gel. Attention is paid also to the environment in which the diffusion processes are implemented (in particular in view of the gel-like samples), porousness of the structure and its mechanical properties.
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