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Title:ŠTUDIJ TiO2 NANO-PREVLEK REGENERIRANIH CELULOZNIH VLAKEN ZA DOSEGANJE SAMOČISTILNEGA UČINKA
Authors:ID Veronovski, Nika (Author)
ID Sfiligoj-Smole, Majda (Mentor) More about this mentor... New window
ID Lobnik, Aleksandra (Comentor)
ID Kreže, Tatjana (Comentor)
Files:.pdf DR_Veronovski_Nika_2009.pdf (4,38 MB)
MD5: 9C62C2F86B97CDB6B0D0D0308F41D8E3
PID: 20.500.12556/dkum/4627d987-ad8d-4b82-b17d-940373a2520f
 
Language:Slovenian
Work type:Dissertation
Organization:FS - Faculty of Mechanical Engineering
Abstract:Cilj naloge je bil razvoj postopka nanomodifikacije površine regeneriranih celuloznih vlaken z namenom pridobivanja vlaken s trajnimi samočistilnimi lastnostmi, hkrati pa zaščititi vlakno pred negativnimi vplivi postopka obdelave in fotokatalitičnega delovanja delcev na lastnosti vlaken. Za raziskavo smo uporabili regenerirana celulozna liocel vlakna, ki sodijo med obnovljiva vlakna izdelana po ekološko nespornem postopku direktnega raztapljanja celuloze. Za modifikacijo smo uporabili fotokatalizator TiO2, ki smo ga na vlakno nanašali z uporabo različnih postopkov. Raziskava je zajemala dva temeljna postopka plastenja; to sta postopek neposrednega oblikovanja nanoprevlek na vlaknih in vezava predhodno oblikovanih delcev na vlakna. Preučili smo vpliv pogojev plastenja na morfologijo nanoprevlek in na njihovo učinkovitost. V prvi fazi smo pripravili prevleke na vlaknih s pomočjo sol-gel tehnologije. Proučili smo vpliv pogojev sol-gel postopka na velikost in učinkovitost delcev ter nekatere lastnosti obdelane tekstilije (mehanske lastnosti, trajnost obdelave, elektrokinetične lastnosti) ter ocenili poškodbe vlaken. V drugem delu raziskave smo za pripravo prevlek uporabili že pripravljene TiO2 nanodelce, ki imajo ustrezno fotokatalitično aktivnost za doseganje samočistilnosti modificiranih površin. Določili smo uporabnost TiO2 P25 nanodelcevza oblikovanje prevlek na vlaknih na osnovi stabilnosti njihovih koloidnih raztopin. Za doseganje stabilizacije delcev v vodnih disperzijah smo spreminjali površinski naboj delcev in/ali uporabili površinsko aktivna sredstva. Poleg tega smo preučili postopek vezave kompozitnih TiO2-SiO2 nanodelcev, kjer SiO2 deluje hkrati kot vezivno sredstvo, poleg tega pa ščiti nosilno vlakno pred fotokatalitičnimi vplivi katalizatorja. Kot vezivno sredstvo za vezanje nanodelcev smo uporabili še raztopino celuloze. Kljub temu, da so raziskave pokazale, da imajo vsi vzorci s TiO2 prevlekami samočistilno sposobnost, pa je le-ta najvišja v primeru vzorcev, obdelanih v stabilni disperziji TiO2 P25 nanodelcev. Največ organske snovi v madežu se razgradi v 8-ih dneh izpostavljenosti direktni dnevni svetlobi. Po funkcinalni učinkovitosti in vplivu na tehnološko-uporabne lastnosti je postopek izdelave kompozitnih TiO2-SiO2 nanoprevlek najprimernejši.
Keywords:TiO2 nanodelci, fotokatalizator, samočistilnost, regenerirana celulozna vlakna
Place of publishing:Maribor
Publisher:N. Veronovski]
Year of publishing:2009
PID:20.500.12556/DKUM-10208 New window
UDC:677
COBISS.SI-ID:245715200 New window
NUK URN:URN:SI:UM:DK:VWXBLKP2
Publication date in DKUM:30.04.2009
Views:5357
Downloads:573
Metadata:XML DC-XML DC-RDF
Categories:KTFMB - FS
:
VERONOVSKI, Nika, 2009, ŠTUDIJ TiO2 NANO-PREVLEK REGENERIRANIH CELULOZNIH VLAKEN ZA DOSEGANJE SAMOČISTILNEGA UČINKA [online]. Doctoral dissertation. Maribor : N. Veronovski. [Accessed 1 April 2025]. Retrieved from: https://dk.um.si/IzpisGradiva.php?lang=eng&id=10208
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Secondary language

Language:English
Title:STUDY OF TiO2 NANOCOATINGS ON REGENERATED CELLULOSE FIBRES WITH TiO2 NANOPARTICLES FOR OBTAINING SELF-CLEANING EFFECT
Abstract:The aim of present work was to develop nanomodification process for regenerated cellulose surfaces for obtaining self-cleaning fibres with long-lasting self-cleaning properties and at the same time to prevent fibres against the negative influences of the process and against the strong photocatalytic action of TiO2 nanoparticles on fibre properties. For the modification sustainable, biodegradable regenerated cellulose Lyocell fibres were used, created through an ecological direct dissolving process of cellulose. For modification TiO2 photocatalyst was used, attached using different deposition techniques. The research comprised of two basic coating processes; process of direct (in situ) formation of nanocoatings on fibres surfaces and process of nanocoatigs preparation starting from TiO2 P25 powder. We studied the influence of conditions under which the processes for nanocoating can give rise to self-cleaning cellulose materials on nanocoatings efficiency. In the first phase, nanocoatings on fibres surfaces were prepared using sol-gel technology. We have studied the influence of sol-gel process conditions on the particle size and effectiveness. The influence of nanocoating conditions on applicable properties of treated material (mechanical properties, treatment durability, electrokinetical properties) and fibre damages were determined likewise. In the second part of research, we have used already formed TiO2 P25 nanoparticles, with appropriate photocatalitic ability for obtaining self-cleaning modified surfaces. We determined practical application of TiO2 P25 nanoparticles based on stability of colloid solutions. TiO2 P25 aqueous dispersions were stabilized by changing the particle surface charge density and/or adding selected surfactants. In addition, we studied the process for attaching composite TiO2-SiO2 nanoparticles, where SiO2 acts as a binding agent, furthermore it prevents fibre against photocatalytic influence of catalyst. As a binding agent we have used viscose solution, as well. In spite of the fact, that investigations indicated self-cleaning effectiveness of all TiO2 coated samples, the self-cleaning effectiveness was the highest for samples, treated using stable dispersions of TiO2 P25 nanoparticles. The most of organic material in the stain was decomposed during 8 days uder exposure to direct daylight. According to functional effectiveness and the influence on technologically-applicable properties, the process of preparing composite TiO2-SiO2 nanocoatings was the most appropriate.
Keywords:TiO2 nanoparticles, photocatalyst, self-cleaning, regenerated cellulose fibres


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