Biosyntéza nanostříbra na čipu pro nylonové zvlákňovací směsi.

Abstract

The bachelor's thesis focuses on the synthesis of silver nanoparticles for nylon spinning mixtures, first in a batch mode and then on a microfluidic chip. The theoretical part deals with general methods of preparation of inorganic nanoparticles and comparison of classical chemical methods with biotechnological methods of preparation. The thesis also deals with microfluidics and the advantages of 3D printing in the preparation of a microfluidic chip. Finally, the theoretical part of the work focuses on nanosilver and nylon in terms of characterization and importance for specific applications, as well as the methods of polymer spinning and silver nanoparticles anchoring to nylon fibers. The aim of the experimental part was to get familiar with phytosynthesis, which is a method of silver nanoparticles preparing in a mixture of silver precursor and phytochemicals. Commercially available dried Urtica dioica was used for experiments. First, phytosynthesis was performed in a batch mode and then on a microfluidic chip. The nanoparticles prepared were characterized by scanning transmission electron microscopy, UV/VIS spectroscopy, X-ray diffraction analysis and zeta potential values were measured as well. It was found out that even at the same concentration and ratio of reactants in the batch and on-chip, completely different nanoparticles are prepared in terms of shape, size and concentration of particles in the dispersion. The optionto experiment with reaction kinetics, mechanism and process control in a microchannel environment pushes the boundaries of basic research in the field of nanoparticle synthesis more foreward again.