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11.
POSTOPKI PLEMENITENJA ZA ZMANJŠANJE UV PREPUSTNOSTI MATERIALOV
Patricija Murko, 2009, undergraduate thesis

Abstract: Namen diplomskega delu z naslovom »Postopki plemenitenja za zmanjšanje UV prepustnosti materialov« je bilo proučevanje UV prepustnosti različnih tkanin, obdelanih s potencialnim UV absorberjem, ekstraktom rdečega bora, po različnih tehnoloških postopkih. Analizirala sem pet tkanin, ki so izdelane iz bombaža, poliamida, mešanice bombaža in poliestra v različnih konstrukcijah, gostoti, teži in zračni prepustnosti, saj vse tekstilije niso primeren filter za UV žarke. Te tkanine sem naknadno plemenitila z nanosom UV absorberja po impregnacijskem postopku na foulardu in primerjalno po izčrpalnem postopku. Vsem vzorcem sem spektrofotometrično izmerila UV prepustnost in izračunala UPF faktor. Ugotovila sem, da ima rdeči bor kot uporabljen UV absorber pomemben vpliv na zaščito pred ultravijoličnim sevanjem, njegova učinkovitost pa je v veliki meri odvisna od materiala, tehnološkega postopka in strukture tekstilije.
Keywords: UV absorber, UV prepustnost, rdeči bor, UPF, UVA, UVB.
Published: 01.07.2009; Views: 2332; Downloads: 194
.pdf Full text (1,58 MB)

12.
OBDELAVA VLAKEN Z MODIFICIRANIM KSILANOM ZA DOSEGO HEMOKOMPATIBILNIH LASTNOSTI
Nena Velkova, 2010, undergraduate thesis

Abstract: Razvoj hemokompatibilnih biomaterialov predstavlja izjemen izziv, saj so kardiovaskularni zapleti glavni vzrok smrti ljudi v razvitem svetu. Raziskave so zato v zadnjem času usmerjene v iskanje protitrombogenih substanc rastlinskega izvora. Cilj diplomskega dela je bil kemično modificirati ksilane različnih izvorov v smislu pridobitve protitrombogenih lastnosti ter jih aplicirati na vlaknih. Rezultati so pokazali, da je bil uporabljeni postopek sulfatacije primeren za obdelavo uporabljenih vzorcev ksilanov. Aktivirani delni tromboplastinski čas (APTT) se po sulfataciji značilno zviša v primerjavi z nesulfatiranimi vzorci. APTT se zviša z višjo vsebnostjo sulfatnih skupin v vzorcu. Po sulfatiranju postanejo ksilani topni v vodi in torej primerni za aplikacijo na vlaknih.
Keywords: hemokompatibilni biomateriali, ksilani, sulfatiranje, PET, antikoagulacijske lastnosti, titracijske metode
Published: 17.09.2010; Views: 1489; Downloads: 106
.pdf Full text (990,52 KB)

13.
ŠTUDIJ LASTNOSTI VLAKEN IZ PERUTNINSKEGA PERJA
Andreja Križanec, 2011, bachelor thesis/paper

Abstract: Perutninsko perje je eden od zelo obremenjujočih odpadkov perutninske industrije, zato bo pomenil razvoj novih možnosti uporabe in predelave odpadnega perutninskega perja enega od najpomembnejših dosežkov te branže. Cilj diplomskega dela je bil raziskati lastnosti vlaken iz odpadnega perutninskega perja in ugotoviti na katerih področjih in za kakšne materiale/izdelke bi bila potencialno uporabna. Rezultati so pokazali, da je perutninsko preje po kemizmu zelo podobno volni. Osnovna razlika je v tem, da so reakcije v topilih in reagentih pri perju, zaradi kompaktnejše nadmolekulske strukture počasnejše in manj intenzivne kot pri volni. Perje pri standardni atmosferi navzema okrog 13 % manj vlage in po omakanju in centrifugiranju zadržuje okrog 12 % manj vode kot volna, ima nekoliko nižjo trdnost in je v povprečju mnogo tanjše od volne. Boljša odpornost na kemikalije in nabrekanje v vodi v primerjavi z volno, daje perju boljšo potencialno uporabnost za tehnične tekstilije in kompozite, kot so npr.: izolacijski in filtracijski materiali.
Keywords: perutninsko perje, keratin, volnena vlakna, higroskopičnost, kvalitativne analize
Published: 02.09.2011; Views: 1675; Downloads: 147
.pdf Full text (3,86 MB)

14.
ŠTUDIJ VPLIVA OBDELAVE S HITOZANOM NA HIDROFOBNO/HIDROFILNI KARAKTER VLAKEN
Karmen Lozinšek, 2011, undergraduate thesis

Abstract: Zaradi porasta mikrobiološko pogojenih bolezni in okužb potekajo številne raziskave z namenom poiskati trajne rešitve z novimi biorazgradljivimi materiali, obdelavami oz. tehnologijami, ki zagotavljajo trajne učinke ob popolni varnosti tako za človeka kot okolje. Hitozan je eno izmed najbolj obetajočih naravnih sredstev s protimikrobnim delovanjem, vendar pa obdelave tekstilnih vlaken s hitozanom bistveno vplivajo na površinske lastnosti materiala in na njegov hidrofilno/hidrofobni karakter, ki je pri medicinskih aplikacijah bistvenega pomena. Namen diplomskega dela je bil, ugotoviti kako obdelava celuloznih vlaken (bombaž, viskoza, modal in liocel) s hitozanom ter različni pogoji sušenja vplivajo na njihove površinske hidrofilno/hidrofobne lastnosti. Raziskava sprememb hidrofilno/hidrofobnih lastnosti bombaža in različnih tipov viskoznih vlaken bo omogočila izbiro najprimernejše surovine za posamezne izdelke in nakazala možnosti za povečanje njihove vpojnosti, ki bi naj zadostile različnim zahtevam potrošnikov. Rezultati so pokazali, da se regeneriranim celuloznim vlaknom po obdelavi s hitozanom hidrofilnost signifikantno zviša, in sicer v povprečju za 10 %. Sušenje s hitozanom obdelanih vlaken pri višji temperaturi kratek čas ugodneje vpliva na zvišanje hidrofilnosti kot sušenje pri sobni temperaturi. Bombažu pa se po obdelavi s hitozanom hidrofilnost zniža, saj se stični koti z vodo v primerjavi z neobdelanimi vlakni zvišajo za 6 %.
Keywords: medicinske tekstilije, celuloza, bombaž, viskoza, modal, liocel, hitozan, tenziometrija, stični kot
Published: 04.10.2011; Views: 1919; Downloads: 188
.pdf Full text (1,76 MB)

15.
ŠTUDIJ POSTOPKOV ČIŠČENJA ODPADNEGA PERUTNINSKEGA PERJA ZA NADALJNJO UPORABO
Zala Urisk, 2011, undergraduate thesis

Abstract: V diplomskem delu z naslovom »Študij postopkov čiščenja odpadnega perutninskega perja za nadaljnjo uporabo« je bil namen ugotoviti, kateri je najbolj optimalen postopek čiščenja odpadnega perutninskega perja, ki je kot stranski produkt mesne industrije zelo obremenjujoče za okolje. Pri postopku pranja odpadnega perutninskega perja smo spreminjali parametre pranja: temperaturo, uporabo pralnega sredstva in uporabo ultrazvoka. S pomočjo številnih analiznih metod, kot so določanje motnosti odpadne kopeli, količine trdnih delcev v kopeli, celotnega organskega ogljika, celotnega dušika, vsebnosti maščob in mikrobioloških poškodb, smo ugotavljali kakšne lastnosti ima odpadna pralna kopel in oprano perje, z namenom, da bi določili optimalen postopek pranja, ki perju nudi želene in potrebne lastnosti za določeno področje uporabe.
Keywords: čiščenje vlaken, keratinska vlakna, analizne metode, perutninsko perje
Published: 13.10.2011; Views: 1534; Downloads: 87
.pdf Full text (1,70 MB)

16.
Cellulose fibres functionalised by chitosan : characterization and application
Simona Strnad, Olivera Šauperl, Lidija Fras Zemljič, 2010, independent scientific component part or a chapter in a monograph

Keywords: cellulose fibers, medical applications, chitosan, antimicrobic properties
Published: 31.05.2012; Views: 971; Downloads: 13
URL Link to full text

17.
Antimicrobial efficiency of functionalized cellulose fibres as potential medical textiles
Tijana Ristić, Lidija Fras Zemljič, Monika Novak, Marjetka Kralj Kunčič, Silva Sonjak, Nina Gunde-Cimerman, Simona Strnad, 2011, independent scientific component part or a chapter in a monograph

Abstract: This chapter presents an overview of methods for cellulose fibres functionalization in order to introduce antimicrobial activity. In view the need for ecologically friendly textiles antimicrobial finishing is introduced, together with some strategies for the functionalization of fibres using biodegradable polysaccharides such as the use of chitosan. Additionally,the methods used for the microbiological testing of these fibres are discussed and the current disadvantages of these methods indicated. Moreover, a new strategy for a reliable methodology regarding the antimicrobial testing of oriented fibre-based polymers such as cellulose is discussed, which could also be useful within several other polymer industrial fields.
Keywords: anitmicrobial agents, medical textiles, cellulose fibres, microbiological test, antimicrobial efficiency
Published: 01.06.2012; Views: 1411; Downloads: 30
URL Link to full text

18.
Electrokinetic investigation of polyelectrolyte adsorption and multilayer formation on a polymer surface
Stefan Köstler, Volker Ribitsch, Karin Stana-Kleinschek, Georg Jakopic, Simona Strnad, 2005, original scientific article

Abstract: Self assembled polyelectrolyte layers of poly(sodium 4-styrenesulfonate) (PSS), and poly(diallyldimethylammonium chloride) (PDADMAC) were deposited on planar poly(ethylene terephthalate) (PET) substrates using the layer-by-layer technique. Charged functional groups were generated on the polymer substrates by means of a surface modification procedure prior to polyelectrolyte adsorption. The layers were characterised concerning their electrokinetic properties. The build-up of multilayer architectures could be followed by changes of the zeta-potential versus pH curves. An increase of coating density with increasing layer number was found. The electrokinetic properties of the PET substrates were not recognised anymore if more then four layers were applied. If PSS formed the outermost layer these assemblies were very stable against shear forces while if PDADMAC formed the outermost layer the films were partially destroyed by high shear forces.
Keywords: textile materials, polyelectrolyte multilayers, layer-by-layer assembly, zeta-potential, ellipsometry, polymer substrate, layer stability
Published: 01.06.2012; Views: 1305; Downloads: 50
URL Link to full text

19.
Characterisation of grass fibres
Majda Sfiligoj-Smole, Tatjana Kreže, Simona Strnad, Karin Stana-Kleinschek, Silvo Hribernik, 2005, original scientific article

Abstract: The elementary grass fibres were isolated from different grass and legumes sorts, i.e. Ryegrass (Lolium hybridum Gumpenstein), Wheat straw, Trefoil (Trifolium pratense) and Lucerne (Medicago sativa). The fibre-samples were obtained in a bio-refinery, after the liquid phase containing proteins and lactic acid was eliminated from the ensiled and green grasses, respectively. For the isolation of elementary grass fibres different processes were used. The morphological characteristics of stems and leaves of different grass species were microscopically observed. On the microscopical stem and leaves cross-section samples the quantification of fibres sclerenchyma cells was performed. The quantitative analysis was carried out in order to obtain basic quantitative data on grass fibres, such as area of the single fibre or group of fibres, diameter of a single fibre or group of fibres and distances betweenthe most distant and least distant points on the area of the fibre. Measurements were made using a Carl Zeiss software KS 300, which runs on a computer connected to the image analysis equipment consisting of a microscope and a digital camera. In addition to, geometrical and mechanical properties ofisolated fibres and fibre bundles were determined. Due to the grass history,i.e. deformations and damages caused by the treatment of grasses in the bio-refinery, maturity grade, grass or legumes type and conditions during grass growth, the plant structures vary considerable in their properties.
Keywords: textile fibres, plant fibres, grass, properties
Published: 01.06.2012; Views: 1114; Downloads: 57
URL Link to full text

20.
Flax fibres sorption properties influenced by different pretreatment processes
Tatjana Kreže, Severina Iskrač, Majda Sfiligoj-Smole, Karin Stana-Kleinschek, Simona Strnad, Darinka Fakin, 2005, original scientific article

Abstract: The sorption behavior of raw and treated flax fibers was investigated. This paper presents the effect of conventional pretreatment processes (alkaline, acid) in comparison to environment-friendly enzymatic processes on the sorption ability of flax fibers. Weight-loss, moisture sorption, water retention value and contact angle were determined in order to interpret the pretreatment results. In addition, the influence of the process on the fibers' mechanical properties was studied. The ecological parameters of the treatment wastewaters were analyzed.
Keywords: textile fibres, flax, flax fibre properties, pretreatments, sorption properties, mechanical properties, ecological parameters
Published: 01.06.2012; Views: 1148; Downloads: 20
URL Link to full text

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