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1.
Development of pH Responsive Polysaccharide Based Wound Dressings : doctoral disertation
Beste Elveren, 2023, doktorska disertacija

Opis: In the scope of the Doctoral Dissertation, a polysaccharide based stimuli-responsive smart material with controlled drug release was developed by using electrospinning technique, which allowed to form stimuli-responsive nanofibers with rapid visual detection of pH change in the wound bed along with anti-inflammatory activity. Incorporation of halochromic dyes into electrospun nanofibers has been an intriguing area for wound healing applications. Furthermore, it is known that the pH value within the wound milieu directly and indirectly influences all biochemical reactions taking place in the process of wound healing. It has been proven that the surface pH of a wound plays an important role in wound healing as it helps control infection and increases the antimicrobial activity, oxygen release, angiogenesis, protease activity, and bacterial toxicity. Therefore, visual pH monitoring without the need of removing the wound dressing was one of the aims of the Doctoral Dissertation. Produced stimuli-responsive wound dressings were characterized according to their morphological and chemical properties using well-known techniques such as, rheometry, conductivity, Scanning Electron Microscopy (SEM),CIE Lab, Thermogravimetric Analysis (TGA), UV/VIS Spectrophotometry, and Attenuated Total Reflection Infra-Red Spectroscopy (ATR-IR). Responsiveness of the nanofibers were achieved by integration of different halochromic dyes [bromocresol green (BCG), bromothymol blue (BTB) and thymol blue (TB)] to obtain a range of pH values. To tackle the problem of leaching of the dyes, a complexing agent; poly-diallyldimethylammonium chloride (PDADMAC) was integrated and an analysis on the formation of complexation was performed by using pH-potentiometric titration and Quartz Crystal Microbalance with Dissipation (QCM-D) and Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS) techniques. Additionally, release tests were performed to prove that the leaching of the halochromic dyes is reduced significantly up to 97%. Furthermore, the responsiveness of the nanofibers was investigated by exposing the nanofibers to different buffer solutions with pH values 4, 7 and 10. The color change of the nanofibers were analyzed using the CIE Lab system while a visual color shift was observed according to their characteristics. Lastly, diclofenac (DFC), an anti-inflammatory drug molecule was integrated to the system and drug release studies were performed by using Franz diffusion cells. A controlled release of the drug molecule (DFC) to the wound bed is achieved and quantitative evaluations were done. Consequently, the drug release from the smart wound dressings were identified to have two separate profiles during the release. The mathematical models that were identified to fit to the kinetics are, first-order, Korsmeyer-Peppas, and Higuchi release model, confirming the controlled drug release.
Ključne besede: stimuli-responsive, polysaccharides, wound dressings, halochromism, controlled drug release, smart materials
Objavljeno v DKUM: 06.10.2023; Ogledov: 201; Prenosov: 22
.pdf Celotno besedilo (8,48 MB)

2.
Študij uporabe barvil pridobljenih iz odpadnih vej murve v tekstilnem tisku : magistrsko delo
Anita Krajnc, 2023, magistrsko delo

Opis: Področja krožnega gospodarstva, kot so odpadki, raba naravnih virov in energije, zajemajo tudi tekstil in tekstilno industrijo - strategija o trajnostnem tekstilu in rabi naravnih barvil. Tekstilni materiali (naravni in sintetični) so, glede na potrebe in želje kupcev, obarvani ali tiskani. Skoraj vsa sintetična barvila, ki se množično uporabljajo za te namene, sintetizirajo iz fosilnih derivatov z nevernimi kemijskimi postopki, ki imajo negativen vpliv na okolje. Zato je vse večja zavest potrošnikov o okolju prijaznih izdelkih povzročila porast izdelave tekstilij iz naravnih vlaken, barvanih z okolju prijaznimi naravnimi barvili. Cilj magistrske naloge je bil raziskati različne možnosti ekstrakcije naravnega barvila iz ostankov murvinih vej po spomladanskem obrezovanju, ter iz pridobljenih barvil pripraviti okolju prijaznejše tiskarske barvne gošče. Za pridobivanje naravnega barvila iz vej murv smo uporabili ekstrakcijski postopek v Soxletovem ekstraktorju z dvema različnima topiloma, destilirano vodo in etanolom in njunima različnima razmerjema. Izolirane ekstrakte smo okarakterizirali z UV/VIS spektroskopijo, antioksidativnostjo ter z določitvijo fenolnih skupin. Najustreznejši izoliran ekstrakt smo uporabili v postopku direktnega tiska, pri katerem je bila tiskarska barvna gošča pripravljena iz okolju prijazih kemikalij. Seveda nas je zanimala tudi kakovost in obstojnost oblikovanega tiska. Rezultati kažejo, da je za tisk najprimernejša TBG 3 (tiskarska barvna gošča 3, katera je vsebovala monijev železov(II) sulfat) na bombažni tkanini. Zelo dobre lastnosti ima tudi TBG 2 (tiskarska barvna gošča 2, katera je vsebovala kalijev galun).
Ključne besede: naravna barvila, murva, barvanje naravnih tkanin, UV/VIS spektroskopija, antioksidativnost
Objavljeno v DKUM: 20.09.2023; Ogledov: 272; Prenosov: 28
.pdf Celotno besedilo (3,53 MB)

3.
Fabrication of polysaccharide-based halochromic nanofibers via needle-less electrospinning and their characterization: a study of the leaching effect
Beste Elveren, Silvo Hribernik, Manja Kurečič, 2022, izvirni znanstveni članek

Opis: Responsive materials, i.e., smart materials, have the ability to change their physical or chemical properties upon certain external signals. The development of nanofibrous halochromic materials, specifically combining the pH-sensitive functionality and unique nanofiber properties, could yield interesting new applications, especially when the common problem of dye leaching is successfully tackled. Therefore, in this article, we studied the fabrication process of polysaccharide-based halochromic nanofibrous materials by using a combination of various halochromic dyes (bromothymol blue, bromocresol green, and thymol blue) and cellulose acetate in a spinning solution using a one-pot strategy. The inhibition of leaching was addressed by using a complexing agent: poly-diallyl-dimethylammonium chloride (PDADMAC). The preparation of hybrid spinning solutions, their characterization, and ability to form continuous nanofibers were studied using a high production needle-less electrospinning system. The produced hybrid solutions and nanofibers were characterized, in terms of their rheological properties, chemical structure, morphology, and functionality. Fabricated nanofibrous halochromic structures show a clear color change upon exposure to different pH values, as well as the reduced leaching of dyes, upon the addition of a complexing agent. The leaching decreased by 61% in the case of bromocresol green, while, in the case of bromothymol blue and thymol blue, the leaching was reduced by 95 and 99%, respectively.
Ključne besede: halochromism, responsive polymers, polysaccharides, electrospinning
Objavljeno v DKUM: 31.07.2023; Ogledov: 262; Prenosov: 23
.pdf Celotno besedilo (5,54 MB)
Gradivo ima več datotek! Več...

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Nega in higiena tekstilij : dnevnik laboratorijskih vaj
Manja Kurečič, Branko Neral, 2021

Opis: Vsebina študijskega gradiva “Nega in higiena tekstilij, Dnevnik laboratorijskih vaje” zajema področje vrednotenja uspešnosti odstranjevanja nečistoč in razkuževalnega učinka procesa pranja in je namenjena kot pomoč študentom pri izvajanju laboratorijskih vaj. Nega in higiena tekstilij je pomemben dela našega življenja, s katero se vsakodnevno ukvarjamo v naših gospodinjstvih in industrijskih pralnicah. Glavna naloga pralnic je vrniti umazane, kontaminirane tekstilije v čisto, sveže in razkuženo stanje brez pretiranih poškodb na tekstilijah, za nadaljnjo uporabo. Pri ocenjevanju učinkov razkuževalnega pranja tekstilij ugotavljamo število in vrsto preživelih mikroorganizmov in gliv pri določenih inkubacijskih pogojih. Z uporabo tekstilnih bioindikatorjev ugotavljamo učinkovitost odstranjevanja nečistoč in razkuževalni učinek procesa čiščenja in pranja.
Ključne besede: nega in higiena tekstilij, razkuževalni učinek, pranje tekstilij, odstranjevanje nečistoč, mikroorganizmi
Objavljeno v DKUM: 14.09.2021; Ogledov: 913; Prenosov: 117
.pdf Celotno besedilo (4,39 MB)
Gradivo ima več datotek! Več...

7.
Design, Characterisation and Applications of Cellulose-Based Thin Films, Nanofibers and 3D Printed Structures : A Laboratory Manual
Tanja Pivec, Tamilselvan Mohan, Rupert Kargl, Manja Kurečič, Karin Stana-Kleinschek, 2021, drugo učno gradivo

Opis: The introduction of the Laboratory Manual gives the theoretical bases on cellulose and its derivatives, which are used as starting polymers for the preparation of multifunctional polymers with three different advanced techniques - spin coating, electrospinning and 3D printing. In the following, each technique is presented in a separate Lab Exercise. Each exercise covers the theoretical basics on techniques for polymer processing and methods for their characterisation, with an emphasis on the application of prepared materials. The experimental sections contain all the necessary information needed to implement the exercises, while the added results provide students with the help to implement correct and successful exercises and interpret the results.
Ključne besede: multifunctional polymers, polysaccharides, cellulose, electrospun, spin coating, 3D printing, nanofibers, thin films, multifunctional materials, laboratory manuals
Objavljeno v DKUM: 09.03.2021; Ogledov: 777; Prenosov: 23
URL Povezava na datoteko

8.
1st International FibreNet Science for the Public Day : Book of Abstracts
2019, zbornik

Opis: First international conference in the scope of FibreNet project funded by European Commission. The conference brings the FibreNet together international representatives from industry and academia to discuss opportunities and strengths related to bio-based fibre products. In three consecutive sessions, fifteen international PhD students will present their research results, guide you along the value-chain of fibre-based products and give you the opportunity to discuss the future of bio-based materials.
Ključne besede: biobased materials, mechanical properties, paper, packaging, dissemination of research result
Objavljeno v DKUM: 08.01.2020; Ogledov: 1239; Prenosov: 50
URL Povezava na datoteko

9.
Analiza vpliva magnetnega polja na viskoznost in grelno moč magnetne tekočine : magistrsko delo
Jakob Vizjak, 2019, magistrsko delo

Opis: Magnetne tekočine sodijo v kategorijo nanomaterialov zaradi velikostnega razreda suspendiranih magnetnih nanodelcev v nosilni tekočini. Njihova uporabnost se kaže na različnih področjih inženiringa, znanosti in medicine. Ena izmed pomembnejših lastnosti magnetne tekočine je viskoznost, ki je bila predmet opazovanja v magistrski nalogi. Vpliv viskoznosti smo preverili teoretično kot tudi eksperimentalno. V teoretičnem delu smo uporabili in prilagodili matematični model izračuna izgub magnetne tekočine v visokofrekvenčnem magnetnem polju ter raziskali vpliv različnih modelov viskoznosti suspenzije in različnih nosilnih tekočin. Za validacijo matematičnega modela izgub smo na izbranem vzorcu opravili serijo meritev izgub po kalorimetrični metodi, pri kateri se glede na temperaturni odziv merjenca ugotovi specifična stopnja absorpcije (SAR). V eksperimentalnem delu naloge smo opravili meritve viskoznosti možnih nosilnih tekočin po dveh različnih metodah, in sicer najprej s Hoepplerjevim in nato z rotacijskim viskozimetrom. V sklopu meritev z rotacijskim viskozimetrom smo sistematično skušali ugotoviti temperaturno odvisnost in dokazati pojav magnetoreologije.
Ključne besede: magnetne tekočine, specifična absorpcijska stopnja, viskoznost, magnetne izgube, magnetno polje
Objavljeno v DKUM: 22.11.2019; Ogledov: 1215; Prenosov: 128
.pdf Celotno besedilo (4,32 MB)

10.
Development and characterization of novel electrospun matrices with embedded CNC for air filtration
Manja Kurečič, Tanja Pivec, Mojca Božič, Silvo Hribernik, Karin Stana-Kleinschek, 2018, objavljeni povzetek znanstvenega prispevka na konferenci

Ključne besede: nanotechnology, cellulose nanocrystals
Objavljeno v DKUM: 31.05.2018; Ogledov: 1564; Prenosov: 80
.pdf Celotno besedilo (2,43 MB)

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