V. Kleivaitė “The method of highest pore estimation of electrospun thin fibrous webs” doctoral dissertation defence

Thesis Defense

Author, Institution: Virginija Kleivaitė, Kaunas University of Technology

Science area, field of science: Technological Sciences, Material Engineering, T008

Scientific Supervisor: Prof. Dr. Rimvydas Milašius (Kaunas University of Technology, Technological Sciences, Materials Engineering – T008)

Dissertation Defence Board of Materials Engineering Science Field:
Prof. Dr. Sigitas Tamulevičius (Kaunas University of Technology, Technological Sciences, Materials Engineering – T008), chairman
Dr. Juris Blums (Riga Technical University, Materials Engineering – T008)
Dr. Sigitas Krauledas (Center for Physical Sciences and Technology, Materials Engineering – T008)
Prof. Dr. Daiva Mikučionienė (Kaunas University of Technology, Technological Science, Materials Engineering – T008)
Prof. Dr. Jolita Ostrauskaitė (Kaunas University of Technology, Technological Sciences, Materials Engineering – T008)

The dissertation defence takes place online.

The doctoral dissertation is available at the library of Kaunas University of Technology (K. Donelaičio g. 20, Kaunas).

Annotation:

There are many works in which the authors analyse the influence of various parameters on the process of electrospinning or nanofiltration, but most of them do not analyse the structural uniformity of the structure using mathematical statistical criteria. This situation leads to different conclusions and it is impossible to compare the works of different authors. Despite numerous studies in electrospinning, methods for estimating nanofiltration are lacking. This method has been developed for measuring and estimating fiber diameter and coating porosity. This necessity for such a method is obvious and its absence may adversely affect the practical use of the electrospinning product. In this dissertation, all measurements and their results are presented by surface analysis of nanofiber coating, and the experiments are applicable only to very thin (less than 1 µm) coatings. The obtained research results have an important practical significance, because the method of nanofiber coating evaluation proposed in the work allows to evaluate and compare any thin filament structure formed by the electric spinning. The dissertation proposes a new structure estimation method that does not require many calculations, based on the relative value between the largest pore and the value Δd. The developed method was tested with nanofiber structures of different polymers at different results. It has been shown that the developed method can be applied to various polymeric nanofiber coatings.

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