Comparative statistical analysis of the infl uence of processing parameters, for electrospinning (ES) and solution blow spinning (SBS) processes, on nanofi brous poly(L-lactic acid) (PLLA) material morphology and average fi ber diameter was conducted in order to identify the key processing parameter for tailoring the product properties. Further, a comparative preliminary biocompatibility evaluation was performed. Based on Design of Experiment (DOE) principles, analysis of standard effects of voltage, air pressure, solution feed rate and concentration, on nanofi bers average diameter was performed with the Pareto's charts and the best fi tted surface charts. Nanofi bers were analyzed by scanning electron microscopy (SEM). The preliminary biocompatibility comparative tests were performed based on SEM microphotographs of CP5 cells cultured on materials derived from ES and SBS. Polymer solution concentration was identifi ed as the key parameter infl uencing morphology and dimensions of nanofi brous mat produced from both techniques. In both cases, when polymer concentration increases the average fi ber diameter increase. The preliminary biocompatibility test suggests that nanofi bers produced by ES as well as SBS are suitable as the biomedical engineering scaffold material.
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 (PEG 200) 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.
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