TY  - JOUR
AU  - Knezević, Marina
AU  - Kramar, Ana
AU  - Hajnrih, Teodora
AU  - Korica, Matea
AU  - Nikolić, Tanja
AU  - Žekić, Andrijana
AU  - Kostić, Mirjana
PY  - 2022
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/18
AB  - Cotton yarn was oxidized using the various concentrations and pH of potassium permanganate solutions, in order to investigate the influence of oxidation parameters on chemical, mechanical and sorption properties of cotton. The oxidation progress was monitored through weight loss, carbonyl and carboxyl group content, tensile strength, moisture sorption, crystallinity change, surface charge and morphology of modified samples. The carboxyl groups were introduced into the oxidized cotton up to 0.3 mmol center dot g(-1), while the weight loss was up to 5%. The oxidized samples, compared with untreated cotton, exhibited lower tensile strength, higher moisture sorption and surface roughness. Surface charge was evaluated through measurement of zeta potential at different pH of electrolyte, and the correlation was established between carboxyl group content and zeta values measured at neutral pH, which proved that zeta potential can be a valuable tool for characterizing changes in the structure of oxidized cellulose textile materials.
PB  - Taylor & Francis Inc, Philadelphia
T2  - Journal of Natural Fibers
T1  - Influence of Potassium Permanganate Oxidation on Structure and Properties of Cotton
EP  - 415
IS  - 2
SP  - 403
VL  - 19
DO  - 10.1080/15440478.2020.1745120
ER  - 

@article{
author = "Knezević, Marina and Kramar, Ana and Hajnrih, Teodora and Korica, Matea and Nikolić, Tanja and Žekić, Andrijana and Kostić, Mirjana",
year = "2022",
abstract = "Cotton yarn was oxidized using the various concentrations and pH of potassium permanganate solutions, in order to investigate the influence of oxidation parameters on chemical, mechanical and sorption properties of cotton. The oxidation progress was monitored through weight loss, carbonyl and carboxyl group content, tensile strength, moisture sorption, crystallinity change, surface charge and morphology of modified samples. The carboxyl groups were introduced into the oxidized cotton up to 0.3 mmol center dot g(-1), while the weight loss was up to 5%. The oxidized samples, compared with untreated cotton, exhibited lower tensile strength, higher moisture sorption and surface roughness. Surface charge was evaluated through measurement of zeta potential at different pH of electrolyte, and the correlation was established between carboxyl group content and zeta values measured at neutral pH, which proved that zeta potential can be a valuable tool for characterizing changes in the structure of oxidized cellulose textile materials.",
publisher = "Taylor & Francis Inc, Philadelphia",
journal = "Journal of Natural Fibers",
title = "Influence of Potassium Permanganate Oxidation on Structure and Properties of Cotton",
pages = "415-403",
number = "2",
volume = "19",
doi = "10.1080/15440478.2020.1745120"
}

Knezević, M., Kramar, A., Hajnrih, T., Korica, M., Nikolić, T., Žekić, A.,& Kostić, M.. (2022). Influence of Potassium Permanganate Oxidation on Structure and Properties of Cotton. in Journal of Natural Fibers
Taylor & Francis Inc, Philadelphia., 19(2), 403-415.
https://doi.org/10.1080/15440478.2020.1745120

Knezević M, Kramar A, Hajnrih T, Korica M, Nikolić T, Žekić A, Kostić M. Influence of Potassium Permanganate Oxidation on Structure and Properties of Cotton. in Journal of Natural Fibers. 2022;19(2):403-415.
doi:10.1080/15440478.2020.1745120 .

Knezević, Marina, Kramar, Ana, Hajnrih, Teodora, Korica, Matea, Nikolić, Tanja, Žekić, Andrijana, Kostić, Mirjana, "Influence of Potassium Permanganate Oxidation on Structure and Properties of Cotton" in Journal of Natural Fibers, 19, no. 2 (2022):403-415,
https://doi.org/10.1080/15440478.2020.1745120 . .

TY  - JOUR
AU  - Nikolić, Tanja
AU  - Hajnrih, Teodora
AU  - Kramar, Ana
AU  - Petronijević, Živomir
AU  - Kostić, Mirjana
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3784
AB  - Viscose yarn was submitted to oxidation using different sodium periodate concentrations for various periods of time in order to investigate the influence of oxidation on the chemical and sorption properties of the resulting yarns. The oxidation progress was monitored through periodate consumption, aldehyde group content and weight loss of the modified samples. The aldehyde groups were introduced into the oxidized viscose up to 1.284 mmol/g, while the weight loss was generally of about 5%. Compared to the untreated yarn, the oxidized samples exhibited lower water retention and iodine sorption values - of 32.4% and 53.6%, respectively, while moisture sorption values decreased for an oxidation time up to 180 min and increased when the time of oxidation was longer, up to 360 min. The changes in viscose yarn wettability, because of the oxidation treatment, were evaluated based on the parameters determined by the capillary rise method, which are related to the coefficient of diffusion and radius of pores.
PB  - Editura Acad Romane, Bucuresti
T2  - Cellulose Chemistry and Technology
T1  - Influence of periodate oxidation on sorption properties of viscose yarn
EP  - 467
IS  - 5-6
SP  - 459
VL  - 52
UR  - https://hdl.handle.net/21.15107/rcub_technorep_3784
ER  - 

@article{
author = "Nikolić, Tanja and Hajnrih, Teodora and Kramar, Ana and Petronijević, Živomir and Kostić, Mirjana",
year = "2018",
abstract = "Viscose yarn was submitted to oxidation using different sodium periodate concentrations for various periods of time in order to investigate the influence of oxidation on the chemical and sorption properties of the resulting yarns. The oxidation progress was monitored through periodate consumption, aldehyde group content and weight loss of the modified samples. The aldehyde groups were introduced into the oxidized viscose up to 1.284 mmol/g, while the weight loss was generally of about 5%. Compared to the untreated yarn, the oxidized samples exhibited lower water retention and iodine sorption values - of 32.4% and 53.6%, respectively, while moisture sorption values decreased for an oxidation time up to 180 min and increased when the time of oxidation was longer, up to 360 min. The changes in viscose yarn wettability, because of the oxidation treatment, were evaluated based on the parameters determined by the capillary rise method, which are related to the coefficient of diffusion and radius of pores.",
publisher = "Editura Acad Romane, Bucuresti",
journal = "Cellulose Chemistry and Technology",
title = "Influence of periodate oxidation on sorption properties of viscose yarn",
pages = "467-459",
number = "5-6",
volume = "52",
url = "https://hdl.handle.net/21.15107/rcub_technorep_3784"
}

Nikolić, T., Hajnrih, T., Kramar, A., Petronijević, Ž.,& Kostić, M.. (2018). Influence of periodate oxidation on sorption properties of viscose yarn. in Cellulose Chemistry and Technology
Editura Acad Romane, Bucuresti., 52(5-6), 459-467.
https://hdl.handle.net/21.15107/rcub_technorep_3784

Nikolić T, Hajnrih T, Kramar A, Petronijević Ž, Kostić M. Influence of periodate oxidation on sorption properties of viscose yarn. in Cellulose Chemistry and Technology. 2018;52(5-6):459-467.
https://hdl.handle.net/21.15107/rcub_technorep_3784 .

Nikolić, Tanja, Hajnrih, Teodora, Kramar, Ana, Petronijević, Živomir, Kostić, Mirjana, "Influence of periodate oxidation on sorption properties of viscose yarn" in Cellulose Chemistry and Technology, 52, no. 5-6 (2018):459-467,
https://hdl.handle.net/21.15107/rcub_technorep_3784 .

TY  - CONF
AU  - Knežević, Marina
AU  - Hajnrih, Teodora
AU  - Korica, Matea
AU  - Kramar, Ana
AU  - Kostić, Mirjana
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6859
AB  - U ovom radu pamučna pređa je oksidisana kalijum-pemanganatom (KMnO4) pri različitim pH vrednostima i različitim koncentracijama na sobnoj temperaturi. Oksidacija je vršena u cilju čišćenja pamučnih vlakana i uvođenja funkcionalnih grupa u vlakno, kao i ispitivanja mogućnosti deponovanja mangan-dioksida (MnO2) na površinu vlakana tokom oksidacije. Naime, nakon oksidacije kalijum-permanganatom uobičajena procedura je da se uzorci ispiraju natrijum-metabislufitom u cilju uklanjanja zaostalog mangan-dioksida sa površine vlakana koji se javlja kao sporedni produkt oksidacije. U radu su napravljena dva seta uzoraka, pri čemu je nakon završetka oksidacije kod jednog seta uzoraka uklonjen MnO2, a kod drugog seta je ostavljen deponovan MnO2 na uzorcima. Uzorci su okarakterisani sa aspekta prekidne jačine, gubitka mase, sadržaja funckionalnih grupa i količine deponovanog MnO2. Oksidisani uzorci sa uklonjenim MnO2 su pokazali povećanje sadržaja karboksilnih grupa što ih čini veoma pogodnim kao supstrat za dalje modifikovanje, odnosno vezivanje aktivnih elemenata za vlakna. Sa druge strane, uzorci sa deponovanim MnO2 su pokazali efikasnost prilikom obezbojavanja boje metilensko plavo iz vodenih rastvora što ove uzorke čini pogodnim za prečišćavanje otpadnih voda.
AB  - In this work cotton yarn was oxidized with potassium permanganate (KMnO4) under various pH and at different concentration at room temperature. Oxidation was performed for fiber cleaning and in order to introduce functional groups in a fiber, as well as to investigate the possibility to deposit manganese dioxide (MnO2) on the fibers surface during the oxidation. Namely, after the oxidation with potassium permanganate the usual procedure includes washing of samples with sodium metabisulfite in order to remove manganese dioxide from fibers surface which forms as a byproduct of oxidation. In this work, two sets of samples were made, wherein from one set of samples, MnO2 was removed, while in other set of samples deposited MnO2 was left on them. Samples were characterized from aspects of breaking strength, weight loss, functional groups content and the amount of deposited MnO2. Oxidized samples with removed MnO2 exhibited increased amount of functional groups which makes them suitable as a substrate for further modification, i.e. for binding active elements to fibers. On the other hand, samples with deposited MnO2 have shown the efficiency in decolorization of methylene blue solution, which makes these samples suitable for waste water purification.
PB  - Požarevac : Društvo hemičara, tehnologa i metalurga
C3  - Zbornik radova / Savetovanje Novi materijali i mogućnost njihove primene, Požarevac, 17. novembar 2017. godine
T1  - Multifunkcionalna svojstva pamuka oksidisanog kalijum-permanganatom
T1  - Multifunctional properties of cotton oxidized with potassium permanganate
EP  - 78
SP  - 71
UR  - https://hdl.handle.net/21.15107/rcub_technorep_6859
ER  - 

@conference{
author = "Knežević, Marina and Hajnrih, Teodora and Korica, Matea and Kramar, Ana and Kostić, Mirjana",
year = "2017",
abstract = "U ovom radu pamučna pređa je oksidisana kalijum-pemanganatom (KMnO4) pri različitim pH vrednostima i različitim koncentracijama na sobnoj temperaturi. Oksidacija je vršena u cilju čišćenja pamučnih vlakana i uvođenja funkcionalnih grupa u vlakno, kao i ispitivanja mogućnosti deponovanja mangan-dioksida (MnO2) na površinu vlakana tokom oksidacije. Naime, nakon oksidacije kalijum-permanganatom uobičajena procedura je da se uzorci ispiraju natrijum-metabislufitom u cilju uklanjanja zaostalog mangan-dioksida sa površine vlakana koji se javlja kao sporedni produkt oksidacije. U radu su napravljena dva seta uzoraka, pri čemu je nakon završetka oksidacije kod jednog seta uzoraka uklonjen MnO2, a kod drugog seta je ostavljen deponovan MnO2 na uzorcima. Uzorci su okarakterisani sa aspekta prekidne jačine, gubitka mase, sadržaja funckionalnih grupa i količine deponovanog MnO2. Oksidisani uzorci sa uklonjenim MnO2 su pokazali povećanje sadržaja karboksilnih grupa što ih čini veoma pogodnim kao supstrat za dalje modifikovanje, odnosno vezivanje aktivnih elemenata za vlakna. Sa druge strane, uzorci sa deponovanim MnO2 su pokazali efikasnost prilikom obezbojavanja boje metilensko plavo iz vodenih rastvora što ove uzorke čini pogodnim za prečišćavanje otpadnih voda., In this work cotton yarn was oxidized with potassium permanganate (KMnO4) under various pH and at different concentration at room temperature. Oxidation was performed for fiber cleaning and in order to introduce functional groups in a fiber, as well as to investigate the possibility to deposit manganese dioxide (MnO2) on the fibers surface during the oxidation. Namely, after the oxidation with potassium permanganate the usual procedure includes washing of samples with sodium metabisulfite in order to remove manganese dioxide from fibers surface which forms as a byproduct of oxidation. In this work, two sets of samples were made, wherein from one set of samples, MnO2 was removed, while in other set of samples deposited MnO2 was left on them. Samples were characterized from aspects of breaking strength, weight loss, functional groups content and the amount of deposited MnO2. Oxidized samples with removed MnO2 exhibited increased amount of functional groups which makes them suitable as a substrate for further modification, i.e. for binding active elements to fibers. On the other hand, samples with deposited MnO2 have shown the efficiency in decolorization of methylene blue solution, which makes these samples suitable for waste water purification.",
publisher = "Požarevac : Društvo hemičara, tehnologa i metalurga",
journal = "Zbornik radova / Savetovanje Novi materijali i mogućnost njihove primene, Požarevac, 17. novembar 2017. godine",
title = "Multifunkcionalna svojstva pamuka oksidisanog kalijum-permanganatom, Multifunctional properties of cotton oxidized with potassium permanganate",
pages = "78-71",
url = "https://hdl.handle.net/21.15107/rcub_technorep_6859"
}

Knežević, M., Hajnrih, T., Korica, M., Kramar, A.,& Kostić, M.. (2017). Multifunkcionalna svojstva pamuka oksidisanog kalijum-permanganatom. in Zbornik radova / Savetovanje Novi materijali i mogućnost njihove primene, Požarevac, 17. novembar 2017. godine
Požarevac : Društvo hemičara, tehnologa i metalurga., 71-78.
https://hdl.handle.net/21.15107/rcub_technorep_6859

Knežević M, Hajnrih T, Korica M, Kramar A, Kostić M. Multifunkcionalna svojstva pamuka oksidisanog kalijum-permanganatom. in Zbornik radova / Savetovanje Novi materijali i mogućnost njihove primene, Požarevac, 17. novembar 2017. godine. 2017;:71-78.
https://hdl.handle.net/21.15107/rcub_technorep_6859 .

Knežević, Marina, Hajnrih, Teodora, Korica, Matea, Kramar, Ana, Kostić, Mirjana, "Multifunkcionalna svojstva pamuka oksidisanog kalijum-permanganatom" in Zbornik radova / Savetovanje Novi materijali i mogućnost njihove primene, Požarevac, 17. novembar 2017. godine (2017):71-78,
https://hdl.handle.net/21.15107/rcub_technorep_6859 .

TY  - CONF
AU  - Kramar, Ana
AU  - Knežević, Marina
AU  - Hajnrih, Teodora
AU  - Korica, Matea
AU  - Milanović, Jovana
AU  - Kostić, Mirjana
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6847
AB  - Oxidation of cellulose fibers is usual procedure for surface cleaning and introducing new functionalities in their structure. Due to the presence of three hydroxyl groups on each 
glucopiranose unit, cellulose is very susceptible to oxidation. The most desirable and positive 
effect of oxidation is introduction of acidic carboxyl groups in cellulose structure. Acidic 
groups contribute to the surface charge of fibers and have influence on streaming potential of 
fibers. In this work cellulose fibers (cotton and viscose) with different amounts of COOH 
groups were prepared via oxidation with KMnO4, NaIO4 and NaClO2 under various treatment conditions. Carboxyl group content and zeta potential measurements were carried out in order to investigate influence of acidic groups’ quantity on surface charge of fibers. 
Results could help to anticipate how processing technique such as oxidation would influence further textile fibers processing, since surface charge is directly related to the reactivity of cellulose to a different agents, e.g. dyes, finishing agents, drug compounds for wound treatment, etc.
PB  - Belgrade : Institute of Technical Sciences of SASA
C3  - Program and the Book of Abstracts / Sixteenth Young Researchers' Conference Materials Sciences and Engineering, December 6-8, 2017, Belgrade, Serbia
T1  - Monitoring oxidation of cellulose fibers using zeta potential measurements
SP  - 63
UR  - https://hdl.handle.net/21.15107/rcub_technorep_6847
ER  - 

@conference{
author = "Kramar, Ana and Knežević, Marina and Hajnrih, Teodora and Korica, Matea and Milanović, Jovana and Kostić, Mirjana",
year = "2017",
abstract = "Oxidation of cellulose fibers is usual procedure for surface cleaning and introducing new functionalities in their structure. Due to the presence of three hydroxyl groups on each 
glucopiranose unit, cellulose is very susceptible to oxidation. The most desirable and positive 
effect of oxidation is introduction of acidic carboxyl groups in cellulose structure. Acidic 
groups contribute to the surface charge of fibers and have influence on streaming potential of 
fibers. In this work cellulose fibers (cotton and viscose) with different amounts of COOH 
groups were prepared via oxidation with KMnO4, NaIO4 and NaClO2 under various treatment conditions. Carboxyl group content and zeta potential measurements were carried out in order to investigate influence of acidic groups’ quantity on surface charge of fibers. 
Results could help to anticipate how processing technique such as oxidation would influence further textile fibers processing, since surface charge is directly related to the reactivity of cellulose to a different agents, e.g. dyes, finishing agents, drug compounds for wound treatment, etc.",
publisher = "Belgrade : Institute of Technical Sciences of SASA",
journal = "Program and the Book of Abstracts / Sixteenth Young Researchers' Conference Materials Sciences and Engineering, December 6-8, 2017, Belgrade, Serbia",
title = "Monitoring oxidation of cellulose fibers using zeta potential measurements",
pages = "63",
url = "https://hdl.handle.net/21.15107/rcub_technorep_6847"
}

Kramar, A., Knežević, M., Hajnrih, T., Korica, M., Milanović, J.,& Kostić, M.. (2017). Monitoring oxidation of cellulose fibers using zeta potential measurements. in Program and the Book of Abstracts / Sixteenth Young Researchers' Conference Materials Sciences and Engineering, December 6-8, 2017, Belgrade, Serbia
Belgrade : Institute of Technical Sciences of SASA., 63.
https://hdl.handle.net/21.15107/rcub_technorep_6847

Kramar A, Knežević M, Hajnrih T, Korica M, Milanović J, Kostić M. Monitoring oxidation of cellulose fibers using zeta potential measurements. in Program and the Book of Abstracts / Sixteenth Young Researchers' Conference Materials Sciences and Engineering, December 6-8, 2017, Belgrade, Serbia. 2017;:63.
https://hdl.handle.net/21.15107/rcub_technorep_6847 .

Kramar, Ana, Knežević, Marina, Hajnrih, Teodora, Korica, Matea, Milanović, Jovana, Kostić, Mirjana, "Monitoring oxidation of cellulose fibers using zeta potential measurements" in Program and the Book of Abstracts / Sixteenth Young Researchers' Conference Materials Sciences and Engineering, December 6-8, 2017, Belgrade, Serbia (2017):63,
https://hdl.handle.net/21.15107/rcub_technorep_6847 .