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Polish Academy of Sciences

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Michał Wojasiński, MSc

Warsaw University of Technology (PL)


Recent publications
1.  Czarnecka K., Wojasiński M., Ciach T., Sajkiewicz P., Solution blow spinning of polycaprolactone-rheological determination of spinnability and the effect of processing conditions on fiber diameter and alignment, Materials, ISSN: 1996-1944, DOI: 10.3390/ma14061463, Vol.14, No.6, pp.1463-1-18, 2021

Abstract:
The growing popularity of solution blow spinning as a method for the production of fibrous tissue engineering scaffolds and the vast range of polymer-solvent systems available for the method raises the need to study the effect of processing conditions on fiber morphology and develop a method for its qualitative assessment. Rheological approaches to determine polymer solution spinnability and image analysis approaches to describe fiber diameter and alignment have been previously proposed, although in a separate manner and mostly for the widely known, well-researched electrospinning method. In this study, a series of methods is presented to determine the processing conditions for the development of submicron fibrous scaffolds. Rheological methods are completed with extensive image analysis to determine the spinnability window for a polymer–solvent system and qualitatively establish the influence of polymer solution concentration and collector rotational speed on fiber morphology, diameter, and alignment. Process parameter selection for a tissue engineering scaffold target application is discussed, considering the varying structural properties of the native extracellular matrix of the tissue of interest.

Keywords:
solution blow spinning, rheology, image analysis, nanofibers, fiber alignment, biodegradable nanofibers

Affiliations:
Czarnecka K. - IPPT PAN
Wojasiński M. - Warsaw University of Technology (PL)
Ciach T. - Warsaw University of Technology (PL)
Sajkiewicz P. - IPPT PAN
2.  Małolepszy A., Błoński S., Chrzanowska-Giżyńska J., Wojasiński M., Płociński T., Stobiński L., Szymański Z., Fluorescent carbon and graphene oxide nanoparticles synthesized by the laser ablation in liquid, APPLIED PHYSICS A-MATERIALS SCIENCE AND PROCESSING, ISSN: 0947-8396, DOI: 10.1007/s00339-018-1711-5, Vol.124, pp.282-1-7, 2018

Abstract:
The results of synthesis of the fluorescent carbon dots (CDots) from graphite target and reduced graphene oxide (rGO) nanoparticles performed by the nanosecond laser ablation in polyethylene glycol 200 (PEG200) are shown. Two-step laser irradiation (first graphite target, next achieved suspension) revealed a very effective production of CDots. However, the ablation in PEG appeared to be effective with 1064 nm laser pulse in contrast to the ablation with 355 nm laser pulse. In the case of rGO nanoparticles similar laser irradiation procedure was less efficient. In both cases, received nanoparticles exhibited strong, broadband photoluminescence with a maximum dependent on the excitation wavelength. The size distribution for obtained CDots was evaluated using the DLS technique and HRTEM images. The results from both methods show quite good agreement in nanoparticle size estimation although the DLS method slightly overestimates nanoparticle's diameter

Affiliations:
Małolepszy A. - Warsaw University of Technology (PL)
Błoński S. - IPPT PAN
Chrzanowska-Giżyńska J. - IPPT PAN
Wojasiński M. - Warsaw University of Technology (PL)
Płociński T. - Warsaw University of Technology (PL)
Stobiński L. - Warsaw University of Technology (PL)
Szymański Z. - IPPT PAN

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