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    Wyświetlanie 1-8 z 8
    Tytuł:
    Effect of the Surface modification of Cellulose nanofibers on the Mechanical Properties and Disintegrability of Specific PLA/Cellulose Composites
    Autorzy:
    Wietecha, Justyna
    Kazimierczak, Janusz
    Jeziorna, Agata
    Tematy:
    PLA
    polylactide
    cellulose nanofibre
    surfactant
    green composites
    Pokaż więcej
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Powiązania:
    https://bibliotekanauki.pl/articles/59115022.pdf  Link otwiera się w nowym oknie
    Opis:
    PLA/nanofibrillar cellulose (NFC) composite films were produced by solution casting. Before use, the cellulose fibers were modified with various types of surface active agents – cationic, anionic and non-ionic surfactants. The structure and morphology of samples of the cellulose fillers and composite films with polymer were analyzed by means of scanning electron microscopy and PXRD diffraction. Thermal parameters of the composite films were characterized by differential scanning calorimetry and thermogravimetric analysis. The tensile strength and elongation at break of the films were evaluated in mechanical tests. The ability to disintegrate of all PLA/NFC composites under composting conditions was also determined and compared.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of the Surface modification of Cellulose nanofibers on the Mechanical Properties and Disintegrability of Specific PLA/Cellulose Composites
    Autorzy:
    Wietecha, Justyna
    Jeziorna, Agata
    Kazimierczak, Janusz
    Wydawca:
    Sciendo
    Cytata wydawnicza:
    Wietecha, Justyna, et al. "Effect of the Surface modification of Cellulose nanofibers on the Mechanical Properties and Disintegrability of Specific PLA/Cellulose Composites" Fibres & Textiles in Eastern Europe, vol. 31, no. 6, Sciendo, 2023, pp. 15-29. https://doi.org/10.2478/ftee-2023-0051
    Opis:
    PLA/nanofibrillar cellulose (NFC) composite films were produced by solution casting. Before use, the cellulose fibers were modified with various types of surface active agents – cationic, anionic and non-ionic surfactants. The structure and morphology of samples of the cellulose fillers and composite films with polymer were analyzed by means of scanning electron microscopy and PXRD diffraction. Thermal parameters of the composite films were characterized by differential scanning calorimetry and thermogravimetric analysis. The tensile strength and elongation at break of the films were evaluated in mechanical tests. The ability to disintegrate of all PLA/NFC composites under composting conditions was also determined and compared.
    The authors would like to thank Hanna Nosal and Marek Warzała (Łukasiewicz Institute of Heavy Organic Synthesis, Kędzierzyn-Koźle, Poland) for kindly supplying partially saponified fatty acid methyl esters of castor oil (ZS1) and Jagoda Jóźwik-Pruska, Magdalena Szalczyńska and Piotr Cichacz for technical support
    This work partially was carried out within the project “Development of tailor made PHB composites for technical applications“ PHB2MARKET – realized within the ERA-IB2 Programme, 7th Call, with financial support from Polish National Centre for Research and Development and German Federal Ministry of Education and Research.
    Dostawca treści:
    Repozytorium Centrum Otwartej Nauki
    Artykuł
    Tytuł:
    Zdolność do biodegradacji włóknin na bazie PLA z piórami drobiowymi
    Biodegradability of PLA-Based Nonwoven Fabrics with Poultry Feathers
    Autorzy:
    Wietecha, Justyna
    Kowalewski, Tomasz
    Pałczyńska, Michalina
    Jóźwik-Pruska, Jagoda
    Szalczyńska, Magdalena
    Jóźwik-Pruska Jagoda
    Wrześniewska-Tosik, Krystyna
    Współwytwórcy:
    Jóźwik-Pruska Jagoda
    Wydawca:
    MDPI
    Cytata wydawnicza:
    Jóżwik-Pruska, J.; Wrześniewska-Tosik, K.; Kowalewski, T.; Wietecha, J.; Pałczyńnska, M.; Szalczyńska, M. Biodegradability of PLA-Based Nonwoven Fabrics with Poultry Feathers. Polymers 2025, 17, 957. https://doi.org/10.3390/ polym17070957
    Opis:
    Geotextiles are widely used for separation, drainage, filtration, and erosion control, as well as for enhancing plant growth conditions. The objective of this study was to evaluate the impact of incorporating poultry feathers on the biodegradation rate of nonwoven geotextiles in arable soil. The research was conducted under laboratory conditions, with biodegradation assessed based on mass loss. The findings confirmed that the presence of keratin-rich waste positively influenced the biodegradation rate of the tested materials. Additionally, the potential ecotoxicological effects of biodegradation were examined, revealing no adverse impact on microbiological activity. Statistical analysis demonstrated a correlation between material composition and biodegradation time. This study represents a significant step toward the sustainable management of poultry feather waste in agricultural applications. The tested materials could serve as an environmentally viable alternative for long-term applications, aligning with ecological sustainability principles by simultaneously enriching soil with essential nutrients and promoting waste valorization.
    This research “Unlocking a New Feather-Based Bioeconomy for Keratin-Based Agricultural Products”, UNLOCK project was funded from the Bio-based Industries Joint Undertaking by the European Union’s Horizon 2020 research and innovation programme under Grant Agreement Nº 101023306.
    Dostawca treści:
    Repozytorium Centrum Otwartej Nauki
    Artykuł
    Tytuł:
    Determination of selenium as a biomarker of thyroid cancer by HG-AFS method
    Autorzy:
    Wietecha-Posłuszny, Renata
    Kościelniak, Paweł
    Zagrodzki, Paweł
    Dobrowolska-Iwanek, Justyna
    Opis:
    A simple and versatile procedure has been developed for the determination of selenium in biological samples for clinical purposes. The procedure consists of microwave sample digestion and the determination of selenium using atomic fluorescence spectrometry with a hydride generation system (HG-AFS). The method allows the determination of selenium in a range of 0.5–100.0 $\mu$g $L^{-1}$ with a detection limit not higher than 0.2 $\mu$g $L^{-1}$ and with good repeatability not exceeding 1%. It was applied for determination of selenium in women’s plasma samples (n = 90) with a suspicion of a thyroid cancer and the control group of women (n = 87). Most of the obtained results were in the range 30.0–60.0 $\mu$g $L^{-1}$ and either did not match the physiological level of selenium in human plasma or indicate moderate selenium deficiency. In the further examinations the thyroid tissues taken from 30 patients were analyzed. In most of the cases the selenium concentration was found to be lower (0.14–1.67 $\mu$g $g^{-1}$ wet weight) than its physiological level in a healthy tissue. On this basis the hypothesis has been drawn that selenium can be considered as an additional marker of the thyroid cancer disease.
    Dostawca treści:
    Repozytorium Uniwersytetu Jagiellońskiego
    Artykuł
      Wyświetlanie 1-8 z 8

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