1. Engineering Materials and Process Technologies : 2nd Conference of Programme Groups of the Faculty of Mechanical Engineering University of Maribor, Book of Abstracts2025 Opis: The publication presents an overview of the research achievements of Programm Groups of the Faculty of Mechanical Engineering: P2-0424 Design of Novel Properties of (Nano)Materials & Applications, P2-0063 Design of Cellular Structures, P2-0120 Technologies of Metastable Materials, P2-0118 Textile Chemistry and Advanced Textile Materials, and P2-0196 Research in Power, Process, and Environmental Engineering from 2024 to 2025. Members of the program group present their research innovations and progress achieved within the framework of the program group's activities.
Ključne besede: advanced textile materials, composites, nanomaterials, biotechnology, surface functionalization and modification, cellular structures, metastable materials, power, process and environmental engineering
Objavljeno v DKUM: 03.11.2025; Ogledov: 0; Prenosov: 8
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2. A Sustainable Route From Quartz to Bifunctional Material with Adsorbed Lanthanides for Enhanced Fluorescent Activation in Doxycycline SensingO. Semeshko, Maksym Fizer, Valeriia V. Sliesarenko, Jaroslav Briančin, Oleksandr Bondarchuk, Aleksandra Lobnik, Inna V. Melnyk, 2024, izvirni znanstveni članek Opis: A nanosized bifunctional adsorbent with diamino and phenyl groups on its surface is synthesized through the functionalization of silica derived from quartz. The composition, morphology, and particle size of the functionalized silica are characterized using various physicochemical methods. The material demonstrates high sorption properties for La(III) and Ce(III), both found in Ni-MH batteries, as well as Eu(III). The synthesized functionalized silica, with adsorbed lanthanides, is employed for sensor-based detection of doxycycline in aqueous solutions.
Ključne besede: Lanthanides, adsorption, doxycycline sensing, ethylenediamine groups, phenyl groups, quartz, rare earth ions, silica particles, nanosized bifunctional adsorbent, functionalization of silica, sensor-based detection
Objavljeno v DKUM: 27.08.2025; Ogledov: 0; Prenosov: 3
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3. Non-equilibrium plasma methods for tailoring surface properties of polyvinylidene fluoride : review and challengesAlenka Vesel, Rok Zaplotnik, Gregor Primc, Miran Mozetič, Tadeja Katan, Rupert Kargl, Tamilselvan Mohan, Karin Stana-Kleinschek, 2021, pregledni znanstveni članek Opis: Modification and functionalization of polymer surface properties is desired in numerous
applications, and a standard technique is a treatment with non-equilibrium gaseous plasma. Fluorinated polymers exhibit specific properties and are regarded as difficult to functionalize with polar
functional groups. Plasma methods for functionalization of polyvinylidene fluoride (PVDF) are
reviewed and different mechanisms involved in the surface modification are presented and explained
by the interaction of various reactive species and far ultraviolet radiation. Most authors used argon
plasma but reported various results. The discrepancy between the reported results is explained
by peculiarities of the experimental systems and illustrated by three mechanisms. More versatile
reaction mechanisms were reported by authors who used oxygen plasma for surface modification
of PVDF, while plasma sustained in other gases was rarely used. The results reported by various
authors are analyzed, and correlations are drawn where feasible. The processing parameters reported
by different authors were the gas pressure and purity, the discharge configuration and power, while
the surface finish was predominantly determined by X-ray photoelectron spectroscopy (XPS) and
static water contact angle (WCA). A reasonably good correlation was found between the surface
wettability as probed by WCA and the oxygen concentration as probed by XPS, but there is hardly
any correlation between the discharge parameters and the wettability.
Ključne besede: polyvinylidene fluoride, gaseous plasma, surface modification, wettability, functionalization, activation plazma
Objavljeno v DKUM: 16.06.2025; Ogledov: 0; Prenosov: 9
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4. Enhanced photothermal based-heat retention in regenerated cellulose fibers via ceramic particles and polyelectrolyte binders-based surface functionalizationÖzkan Yapar, Ajra Hadela, Alenka Ojstršek, Aleksandra Lobnik, 2025, izvirni znanstveni članek Opis: : There has been growing interest and increasing attention in the field of functional clothing textiles, particularly in product and process development, as well as innovations in heat-generating, retaining, and releasing fibers to maintain a healthy body temperature without relying on unsustainable energy sources. This study, for the first time, reports the various physio-mechanical properties of surface-functionalized regenerated cellulose fibers (RCFs) coated with ceramic particles. The coating imparts photothermal conversion-based heat generation and retention properties with the aid of polyelectrolyte binders. In this design, ZrC enables the conversion of light energy into thermal energy, providing heat for the human body. A feasible coating process was employed, utilizing industrially feasible exhaustion methods to deposit the ZrC particles onto the RCF surface in conjunction with two distinctive polymeric binders, specifically polyethyleneimine (PEI) and polydiallyldimethylammonium chloride (polyDADMAC). The morphological characteristics and tensile properties of the coated RCFs were analyzed via scanning electron microscopy (SEM) and single-fiber tensile testing. Heat retention and release behaviors of a bundle of fiber samples were assessed using infrared (IR) imaging and an IR emission lamp setup. The SEM results confirmed the successful coating of the ZrC particles on the surface of the RCF samples, influencing negligible on their physical–mechanical properties. The heat retention of the coated RCFs with ZrC and both binders was higher than that of reference regenerated cellulose fibers (RCFs), demonstrating their effective heat generation, retention, and heat release properties. Based on the highlighted prominent results for the coated RCFs, these findings highlight the suitability of the developed functional clothing textiles for targeted applications in non-extreme thermal conditions, ensuring thermo-physiological comfort by maintaining body temperature within a tolerable thermal range (36.5–37.5 ◦C), in contrast to studies reporting significantly higher temperatures (50–78 ◦C) for extreme thermal conditions.
Ključne besede: regenerated cellulose fibers, RCFs, ceramic particles, zirconium carbide, ZrC, surface functionalization, heat generation and retention
Objavljeno v DKUM: 01.04.2025; Ogledov: 0; Prenosov: 138
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5. Influence of cross-linkers on the wash resistance of chitosan-functionalized polyester fabricsTanja Pušić, Tea Bušac, Julija Volmajer Valh, 2024, izvirni znanstveni članek Opis: This study investigates the wash resistance of polyester fabrics functionalized with chitosan,
a biopolymer known for its biocompatibility, non-toxicity, biodegradability and environmentally
friendly properties. The interaction of chitosan with synthetic polymers, such as polyester, often
requires surface treatment due to the weak natural affinity between the two materials. To improve
the interaction and stability of chitosan on polyester, alkaline hydrolysis of the polyester fabric was
used as a surface treatment method. The effectiveness of using cross-linking agents 1,2,3,4-butane
tetracarboxylic acid (BTCA) and hydroxyethyl methacrylate (HEMA) in combination with ammonium
persulphate (APS) to improve the stability of chitosan on polyester during washing was investigated.
The wash resistance of polyester fabrics functionalized with chitosan was tested after 1, 5 and
10 washes with a standard ECE detergent. Staining tests were carried out to evaluate the retention of
chitosan on the fabric. The results showed that polyester fabrics functionalized with chitosan without
cross-linkers exhibited better wash resistance than the fabrics treated with crosslinkers.
Ključne besede: polyster, functionalization, chitosan, cross-linkers, stability, washing
Objavljeno v DKUM: 10.09.2024; Ogledov: 55; Prenosov: 25
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7. Influence of the temperature on the efficiency of cellulose treatment using copolymer chitosan-eugenolOlivera Šauperl, Jasna Tompa, Julija Volmajer Valh, 2014, izvirni znanstveni članek Opis: In order to achieve effective antimicrobial protection of textile materials against microorganisms, a natural compound called chitosan has become very interesting. In regard to the antimicrobial protection of textile materials, functionalization with chitosan does not affect some other properties, such as anti-oxidative or any other action. For this reason, it seems appropriate for chitosan to be combined with any natural antimicrobial active compound, such as eugenol, an extract of clove oil. During this research viscose as a representative of cellulose fibers was used, because it can be functionalized relatively easily. In terms of functionalization, the drying temperature of viscose, after antimicrobial compound application onto substrate, as well as the successful synthesis of copolymer chitosan/eugenol is also important. FTIR spectroscopy was used to evaluate the efficiency of synthesizing a chitosan/eugenol graft copolymer. The spectrophotometric method Acid Orange 7 was chosen as a means for determining the proportion of available antimicrobial active amino groups. In addition, microbiological testing of selected pathogenic micro-organisms was also performed. The results were compared with the results for viscose functionalized by a 1% solution of chitosan.
Ključne besede: chitosan, eugenol, functionalization, viscose, FTIR spectroscopy, Acid orange 7, antimicrobial
Objavljeno v DKUM: 02.08.2017; Ogledov: 1355; Prenosov: 546
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8. Chemical binding of chitosan and chitosan nanoparticles onto oxidized celluloseOlivera Šauperl, Mirjana Kostić, Jovana Milanovic, Lidija Fras Zemljič, 2015, izvirni znanstveni članek Opis: The aim of this study was to analyze binding of chitosan and chitosan nanoparticles onto cellulose via oxidized cellulose.
The ability of chitosan and chitosan nanoparticles to be adsorbed onto surfaces was determined by the use of the XPS spectroscopy which provided information about chemical composition of the fiber surface. On the other hand, the gravimetric method was also used by which the amount of chitosan and chitosan nanoparticles bounded onto surface was calculated based on the difference in masses before and after functionalization. The most important was to study the influence of aldehyde groups on the stability of chitosan binding onto cellulose. Thus, desorption of chitosan/chitosan nanoparticles
from the fiber surfaces was evaluated by the presence of total nitrogen (TN) in desorption bath as well as by polyelectrolyte titrations. Together with these two methods, desorption was evaluated
also by gravimetric method, where the extent of desorption was evaluated on the basis of the differences in the masses of fibers before and after desorption.
It is concluded that the chitosan and chitosan nanoparticles are more efficiently bounded onto
oxidized cellulose in comparison with the non-oxidized (reference) ones. Despite the binding of the positively-charged amino groups with the negative groups of cellulose and consequently smaller amount of available/residual protonated amino groups that are responsible for bioactivity, such functionalized fibers are still specifically antimicrobial.
Ključne besede: cellulose, oxidized cellulose, oxidation, chitosan, chitosan nanoparticles, FTIR, XPS, antimicrobial functionalization
Objavljeno v DKUM: 02.08.2017; Ogledov: 1416; Prenosov: 514
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9. Covalent binding of heparin to functionalized PET materials for improved haemocompatibilityMetod Kolar, Miran Mozetič, Karin Stana-Kleinschek, Mirjam Fröhlich, Boris Turk, Alenka Vesel, 2015, izvirni znanstveni članek Opis: The hemocompatibility of vascular grafts made from poly(ethylene terephthalate) (PET) is insufficient due to the rapid adhesion and activation of blood platelets that occur upon incubation with whole blood. PET polymer was treated with NHx radicals created by passing ammonia through gaseous plasma formed by a microwave discharge, which allowed for functionalization with amino groups. X-ray photoelectron spectroscopy characterization using derivatization with 4-chlorobenzaldehyde indicated that approximately 4% of the –NH2 groups were associated with the PET surface after treatment with the gaseous radicals. The functionalized polymers were coated with an ultra-thin layer of heparin and incubated with fresh blood. The free-hemoglobin technique, which is based on the haemolysis of erythrocytes, indicated improved hemocompatibility, which was confirmed by imaging the samples using confocal optical microscopy. A significant decrease in number of adhered platelets was observed on such samples. Proliferation of both human umbilical vein endothelial cells and human microvascular endothelial cells was enhanced on treated polymers, especially after a few hours of cell seeding. Thus, the technique represents a promising substitute for wet-chemical modification of PET materials prior to coating with heparin.
Ključne besede: poly(ethylene terephthalate), vascular graft, biocompatibility, heparin, plasma, functionalization, haemolysis, platelet adhesion, endothelization
Objavljeno v DKUM: 21.06.2017; Ogledov: 1344; Prenosov: 375
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10. Synthesis of micro-composite beads with magnetic nano-particles embedded in porous CaCO[sub]3 matrixAlenka Vesel, Aljoša Košak, David Haložan, Kristina Eleršič, 2012, izvirni znanstveni članek Opis: A method for synthesis of soft magnetic microbeads is presented. The microbeads are made from magnetic nanoparticles dispersed in CaCO3 (calcium carbonate) matrix. The composite beads are almost perfectly spherical with a diameter of few micrometers. The majority of the composite beads consists of a porous CaCO3 matrix. Magnetic nanoparticles with a size of about 10-15 nm are made of Fe2O3. They are captured inside the pores of CaCO3 matrix during its formation. CaCO3 matrix is formed by crystallization from saturated solution of sodium carbonate and calcium chloride. The composite beads are coated with a layer of functionalized polymer. The magnetic microbeads were characterized by SEM and XPS. Different functional groups were detected by XPS measurements including SO3–,NH3+,NH2,CO32– and OH groups. The results indicate that the iron oxide particles are absent on the surface and that the polymer coating serves as a good biocompatible film.
Ključne besede: composite, surface characterization, XPS, functionalization, Fe nanoparticles, microbeads
Objavljeno v DKUM: 23.03.2017; Ogledov: 1335; Prenosov: 170
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