A Comparative Study on Moisture Management Properties of Cotton/Elastane Plain Knit Fabrics Having Different Elastane Ratio

Mirjana Kostić 한국섬유공학회 2022 Fibers and polymers Vol.23 No.8

Fabric liquid moisture transport properties in multi-dimensions, called moisture management properties, influenceclothing comfort. For clothing comfort, moisture must be quickly removed from the body surface in the form of liquids andvapors. This removal depends on the fiber type and textile structure such as yarn and fabric type used. In the fabrics requiringelasticity, such as tights, sportswear, swimwear, underwear, and corsetry, the use of elastane yarn gradually increases, andthese fabrics are also fabrics that require high clothing comfort. Because of this in this study, it is aimed that moisturemanagement properties are comparatively researched in plain knit fabrics containing elastane at different ratios. For this aimplain knit without elastane and 3 different fabrics with elastane obtained by 19.7 tex cotton yarn and 44 dtex elastane yarnwere used as samples. Elastane yarn was fed to feeders as 1/1, 2/1, and full ratios. Moisture management properties of thesamples were determined by an SDL Atlas MMT test device according to AATCC 195 standard. The study results show thatelastane content in plain knit fabric strongly affects moisture management properties, and overall moisture managementcapability (OMMC) decreases with increasing elastane ratio in the fabrics, and thus, high elastane content reduces clothingcomfort. Plain knit has the best performance, whereas full cotton/elastane fabric has the worst performance, and 1×1 cotton/elastane fabric is very much close to 2×1 cotton/elastane fabric in terms of moisture management.

Phenolic Profile and Antioxidant Capacities of Dried Red Currant from Serbia, Extracted with Different Solvent

Milan N. Mitić,Mirjana V. Obradović,Danijela A. Kostić,Ružica J. Micić,Dušan Đ. Paunović 한국식품과학회 2011 Food Science and Biotechnology Vol.20 No.6

The antioxidant capacity and the phenolic content of 3 dried red currant samples from different geographical regions were studied. Three solvent systems were used (methanol, ethanol, and acetone) at the same concentrations (70%) and with 100% deionized water in presence 0.1% HCl. The antioxidant capacity of the dried fruit extracts was evaluated using DPPH radical scavenging assays. The efficiency of the solvents used to extract phenols from the 3 dried red currant samples varied considerably. The polyphenol content of the dried red currant samples was 3.26 to 12.68 mg gallic acid equivalent/g dried fruit. The high phenolic content was significantly correlated with the high antioxidant capacity. The following compounds were identified and quantified using HPLC with photodiode-array detection: 3 anthocyanins,2 flavonols, 2 flavan-3-ols, and 3 hydroxycinnamic acids in all samples. Generally, red currant fruits are a rich source of phenolics, which shows an evident antioxidant capacity.

Alkali Treated Jute Fabrics Suitable for the Production of Inexpensive Technical Textiles

Aleksandra Ivanovska,Koviljka Asanović,Maja Jankoska,Sanja Pavlović,Goran Poparić,Mirjana Kostić 한국섬유공학회 2022 Fibers and polymers Vol.23 No.8

This work aimed to obtain jute fabrics suitable for the production of inexpensive technical textiles by using simplealkali treatments. The influences of alkali concentration (1-17.5 % NaOH) and treatment duration (5-30 min) on the fabrics’compression properties, abrasion resistance, and sound absorption coefficient were studied in detail. With increasing thetreatment severity, the fabric compressibility decreases by 19.6-33.9 % due to increased fabric compactness. In parallel, thefiber crystallinity index and hemicellulose content decrease, while the fibers’ interfibrillar regions become less dense and lessrigid contributing to 19.0-27.0 % better recoverability after compression. The mercerized fabrics possessed a notably lowermass loss (4.1-5.9 %) after 750 abrasion cycles compared to the other investigated fabrics (18.9-30.9 %), which could beascribed to the higher friction forces existing between the yarns within the mercerized fabrics and between the fibers withinthe yarns, as well as higher elongation at maximum force. In the case of the fabrics treated for 5 or 15 min with differentNaOH concentrations, their mass losses during abrasion decrease with increasing the elementary fiber liberation, while thesound absorption coefficients increase with increasing the fabric compactness. Mercerized fabrics are capable of absorbingabout 28 % to 2.7 times (at 990 Hz) and 2.0 to 2.4 times (at 4090 Hz) higher mechanical sound energy compared to theuntreated fabric. The jute fabric mercerized during 30 min could be used for the production of carpet backings, while thosemercerized during 5 min is the most suitable for the production of sound-absorbing materials.

A Comparative Study of Ni (II) Removal from Aqueous Solutions on Ca-Alginate Beads and Alginate-Impregnated Hemp Fibers

Aleksandar Zdujić,Katarina Trivunac,Biljana Pejić,Marija Vukčević,Mirjana Kostić,Milan Milivojević 한국섬유공학회 2021 Fibers and polymers Vol.22 No.1

Ca-alginate particles (CA) and alginate-impregnated hemp fibers (AH) (both, as prepared, dried, and rehydrated)were used as adsorbents for removal of Ni (II) ions from water. Adsorption was examined in the batch system andexperimentally obtained data were analyzed by both linear and nonlinear curve fitting using pseudo-first and pseudo-secondorderrate, as well as Langmuir, Freundlich, and Sips equations. The concentration of Ni (II) ions was measured by atomicabsorption spectrophotometry, while the Fourier transform infrared spectroscopy was used for characterization of adsorbentsurface, before and after the adsorption. Although all tested samples showed similar adsorption capacities of 12 mg/g, it wasfound that rehydration improves adsorption characteristics of AH and increases the removal efficiency above 90 %. Adsorption of Ni (II) ions can be sufficiently described by both kinetic models and Sips isotherm equation, and this relativelyfast process presumably occurs through the mechanism of physisorption and ion-exchange. The obtained results proved thatCa-alginate particles and alginate-impregnated hemp fibers have good potential to reduce nickel concentrations in a costeffectiveand efficient manner.

Electrical Resistivity of Plasma Treated Viscose and Cotton Fabrics with Incorporated Metal Ions

Ana D. Kramar,Koviljka A. Asanović,Bratislav M. Obradović,Milorad M. Kuraica,Mirjana M. Kostić 한국섬유공학회 2018 Fibers and polymers Vol.19 No.3

Cellulose fabrics (viscose and cotton) were treated with atmospheric pressure dielectric barrier discharge (DBD) in air. After DBD treatment, samples were characterized and volume electrical resistance was measured under different relative humidity conditions (φ=40-55 %). Results have shown that DBD treatment increases wettability and polar surface functional groups content, which consequently causes a decrease of volume electrical resistivity of cellulose fabrics in measured relative humidity range (φ=40-55 %). Metal ions (silver, copper, and zinc) were incorporated in untreated and plasma treated samples through sorption from aqueous solutions and incorporation of metal ions into plasma treated cellulose samples decreased electrical resistivity even further. Resistivity of cotton and viscose fabrics with incorporated metal ions followed the order Zn2+ > Cu2+ > Ag+. The most pronounced decrease, for entire order of a magnitude, was obtained by modification of cotton fabric with DBD and silver ions, where value of resistivity dropped from GΩ to a several dozens of MΩ.

Revalorization of Cotton and Cotton/Elastane Knitted Fabric Waste

Aleksandra Ivanovska,Jelena Lađarević,Koviljka Asanović,Leposava Pavun,Mirjana Kostić,Biljana Mangovska 한국섬유공학회 2023 Fibers and polymers Vol.24 No.2

The present paper demonstrates a simple way for revalorization of differently softened cotton and cotton/elastane knittedfabric waste collected from the textile industry. Such waste was used as an adsorbent for Congo Red (CR) dye, whereby upto 96% removal efficiency was reached. The CR adsorption process onto cationic and silicone softened fabrics is in conformitywith Langmuir (with maximum adsorption capacity of 12.533 mg/g) and Freundlich isotherms, respectively. Differentadsorption of CR onto cationic and silicone softened fabrics is ascribed to the different softeners’ fixation to them, whilethe adsorption of CR operates in the same manner, via hydrophobic interactions. The adsorption kinetic data follow thepseudo-second-order model, while the equilibrium was reached after 90 min. Additionally, this study proposed a new circulareconomy solution for the disposal of fabric waste with adsorbed CR generating additional revenues. The volume electricalresistivity measurements confirmed that the knitted fabric wastes with adsorbed CR have 169–737 times lower resistivities(0.008–0.037 GΩ·cm) than before the adsorption. The inversely proportional correlation between fabrics’ adsorptionefficiencies and their volume electrical resistivities after CR adsorption was found. Such knitted fabric waste with adsorbedCR could be defined as dissipative materials and could be used for providing antistatic protection.