| Title: | Surface modified regenerated cellulosic materials with far infrared activity for biomedical applications : doctoral dissertation |
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| Authors: | ID Yapar, Özkan (Author)
ID Lobnik, Aleksandra (Mentor) More about this mentor...  |
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| Files: |  DOK_Yapar_Ozkan_UM_FS_January_2026_1.pdf (6,18 MB)
MD5: 83C3A9D09C4A20CA1387BE0FD17B63C1
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| Language: | English |
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| Work type: | Doctoral dissertation |
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| Typology: | 2.08 - Doctoral Dissertation |
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| Organization: | FS - Faculty of Mechanical Engineering
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| Abstract: | This dissertation presents a comprehensive and systematic study on regenerated cellulosic-based materials, emphasizing surface modification, all-cellulose biocomposites, and advanced processing techniques aimed at creating sustainable multifunctional materials. The work begins with the surface modification of regenerated cellulose fibres (RCFs) using polyelectrolyte binders combined with functional particles such as zirconium carbide (ZrC) and germanium (Ge). These modifications significantly enhance far-infrared emission and heat retention properties, which are critical for biomedical textiles and functional clothing applications. Characterization methods including scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and Fourier-transform infrared spectroscopy (FTIR) confirmed successful surface coatings and chemical interactions while preserving fibre flexibility and mechanical integrity. The second part focuses on the fabrication of all-cellulose biocomposites (ACCs) using a green NaOH/urea solvent system paired with a vacuum-filtration-assisted impregnation method. This environmentally friendly approach results in fully bio-based composites with improved mechanical performance and enhanced interfacial bonding between cellulose polymorphs, confirmed by tensile testing and microscopy. These all-cellulose biocomposites offer promising potential as biodegradable, flexible packaging materials, contributing to circular and sustainable material development. Lastly, the dissertation explores 3D bioprinting of regenerated cellulose filaments processed via ionic liquid dissolution and coagulated using water. This method avoids hazardous chemicals typical in conventional cellulose processing. The printed filaments demonstrate strong mechanical properties and successful printing of complex geometries, validated through rheological and mechanical tests. This approach presents a cost-effective, green alternative for producing cellulose-based structural materials. Together, these studies demonstrate how regenerated cellulose, through innovative surface modification, green solvent systems, and additive manufacturing, can be transformed into multifunctional, sustainable materials with enhanced far-infrared emission and heat retention. The comprehensive use of characterization techniques supports material innovations with broad applications in textiles, biomedical fields, packaging, and engineering. |
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| Keywords: | Regenerated cellulose, all-cellulose biocomposites, NaOH/urea solvent system, surface modification, far-infrared emission, heat retention |
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| Place of publishing: | Maribor |
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| Place of performance: | Maribor |
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| Publisher: | [Ö. Yapar] |
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| Year of publishing: | 2026 |
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| Number of pages: | IX, 136 str. |
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| PID: | 20.500.12556/DKUM-93094 |
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| UDC: | 678.542.3.01:606(043.3) |
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| COBISS.SI-ID: | 270664195 |
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| Publication date in DKUM: | 27.02.2026 |
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| Views: | 235 |
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| Downloads: | 25 |
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| Metadata: |    |
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| Categories: | KTFMB - FS
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