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## Research of interfacial rheology in water-toluene system using the oscillating drop method

### Krzysztof Witek

#### Abstract

The subject of this dissertation is the research on the interfacial rheology, which complements the classically considered parameters characterizing liquid-liquid dispersions. Additionally, in the case of using the drop oscillation method, on which the experimental part of this work was based, it was possible to determine the dynamic properties characterizing more or less complex dispersed systems. As a result of the conducted research, the values of parameters characterizing the interface were obtained, such as interfacial tension (IFT) or elastic (E’) and viscous (E”) moduli, which comprehensively characterize the conditions on the interface. In the first part of this work, the attention was primarily paid to literature analysis, related to the theoretical background of the subject. At the beginning, the parameters characterizing liquid-liquid dispersions were described in detail, the knowledge of which is necessary for understanding the methodology of emulsion production and separation. Becoming familiar with the principles of the emulsification process and the reverse coalescence phenomenon the necessary knowledge about the deformation of drops in the dispersed phase under the influence of various interactions has been gained. Further chapters of this dissertation concerned the description of interfacial tension measurement methods used in the experimental part of this work, as well as methods for measuring rheological properties, taking into account the methodology as well as design of relevant equipment intended for this purpose. The second part contains the experimental research. The interfacial tension values were measured both by classic plate and ring methods, and by the method of oscillating drop. This method also allowed to analyze the interface rheology due to the registration of other characteristic parameters of such a system. The research provided information on the variability of rheological parameters in systems with surfactant additives, as well as for the pure water-toluene one. First of all, the relationship between the surfactant concentration and the interfacial tension was confirmed (IFT decreases with increasing concentration), the decrease was the bigger the higher the frequency of the drop oscillation was. In the case of the elastic (E’) and viscous (E”) moduli, the influence of frequency was also noticed. The higher it was, the higher the increase in the values of these moduli was. Although, it was more noticeable for the elastic modulus, which for each of studied systems reached values higher than those of viscous modulus.
Diploma type
Engineer's / Bachelor of Science
Diploma type
Engineer's thesis
Author
Krzysztof Witek (FCPE) Krzysztof Witek,, Faculty of Chemical and Process Engineering (FCPE)
Title in Polish
Supervisor
Andrzej Ryszard Krasiński (FCPE/CIPE) Andrzej Ryszard Krasiński,, Chair of Integrated Process Engineering (FCPE/CIPE)Faculty of Chemical and Process Engineering (FCPE)
Certifying unit
Faculty of Chemical and Process Engineering (FCPE)
Affiliation unit
Chair of Integrated Process Engineering (FCPE/CIPE)
Study subject / specialization
, Inżynieria Chemiczna i Procesowa
Language
(pl) Polish
Status
Finished
Defense Date
05-02-2019
Issue date (year)
2019
Pages
99
Internal identifier
DICHP-2895
Reviewers
Andrzej Ryszard Krasiński (FCPE/CIPE) Andrzej Ryszard Krasiński,, Chair of Integrated Process Engineering (FCPE/CIPE)Faculty of Chemical and Process Engineering (FCPE) Roman Krzywda (FCPE/DSP) Roman Krzywda,, Department of Separation Processes (FCPE/DSP)Faculty of Chemical and Process Engineering (FCPE)
Keywords in Polish
reologia powierzchni międzyfazowej, dyspersja woda-toluen, związki powierzchniowo czynne, napięcie międzyfazowe, moduły sprężystości i lepkości
Keywords in English
interfacial rheology, water-toluene dispersion, surface active compounds, interfacial tension, elastic and viscous moduli
Abstract in Polish
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277596_Krzysztof_Witek_Praca_dyplomowa_inżynierska.pdf
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Identyfikator pracy APD: 26243

Uniform Resource Identifier
https://repo.pw.edu.pl/info/bachelor/WUT17f5dfd9279c4a5f9d7c39f9ab7ed533/
URN
urn:pw-repo:WUT17f5dfd9279c4a5f9d7c39f9ab7ed533

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