http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Maja Radetić (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
-
Darka Marković,Stoja Milovanović,Željko Radovanović,Irena Zizovic,Zoran Šaponjić,Maja Radetić 한국섬유공학회 2018 Fibers and polymers Vol.19 No.6
This study discusses a novel approach for fabrication of floating photocatalyst which can be efficiently exploited for photodegradation of dyes in aqueous solutions. A fabrication of the floating photocatalyst consisted of two steps: transformation of the poly(ε-caprolactone) beads (PCLb) into poly(ε-caprolactone) foam (PCLf) with porous structure in supercritical carbon-dioxide and subsequent loading of PCLf with TiO2 nanoparticles (NPs). Morphological characterization of the PCLf before and after TiO2 NPs loading was carried out by FESEM. The presence of titanium on the surface and inside the PCLf was detected by EDX. Photocatalytical activity of the floating photocatalyst was investigated in aqueous solution of textile dyes C.I. Acid Orange 7 (AO7) and C.I. Basic Yellow 28 (BY28) which were exposed to lamp that simulates the sun light. In addition to sustainable floatability for a long period of time, developed floating photocatalyst exhibited high rate of photodegradation since the complete discoloration of AO7 and BY28 solutions and photocatalysts alone occurred after 300 and 180 min of illumination, respectively. Its photocatalytic activity was preserved after three repeated photodegradation cycles with unchanged chemical structure that was confirmed by FTIR analysis.
-
Darka Marković,Jelena Ašanin,Tim Nunney,Željko Radovanović,Marija Radoičić,Miodrag Mitrić,Dušan Mišić,Maja Radetić 한국섬유공학회 2019 Fibers and polymers Vol.20 No.11
This study discusses the possibility of fabrication of textile nanocomposites with antimicrobial activity againstantibiotics-resistant bacterial strains and yeast. Modification of cotton fabric with oxalic acid solutions of differentconcentrations provided free carboxyl groups for binding of Cu2+-ions from copper (II) sulfate solution which were furtherreduced with sodium borohydride in alkaline solution. An increase in the concentration of applied oxalic acid resulted inlarger amounts of free carboxyl groups on the cotton fibers, Cu2+-ions uptake and total amounts of Cu-based nanoparticlesafter reduction. XPS and XRD analyses suggested that nanoparticles mainly consisted of CuO with fractions of Cu2O. Fabricated textile nanocomposites ensured maximum reduction of Gram-negative E. coli ATCC 25922, E. coli NCTC 13846,E. coli ATCC BAA-2469, K. pneumoniae ATCC-BAA 2146 and P. aeruginosa ATCC 27853, Gram-positive bacteria S. aureus ATCC 25923 and S. aureus ATCC 43300 and yeast C. albicans ATCC 24433. Additionally, controlled release ofCu2+-ions from fabrics into the physiological saline solution was obtained within 24 hours.
-
Ana Krkobabić,Darka Marković,Aleksandar Kovačević,Vanja Tadić,Marija Radoičić,Tatjana Barudžija,Tatjana Ilic-Tomic,Maja Radetić 한국섬유공학회 2022 Fibers and polymers Vol.23 No.4
The aim of this study was to develop antimicrobial nanocomposite textile material comprising of Cu-basednanostructures synthesized on oxidized cotton fabric using Arctostaphylos uva-ursi (L.) Spreng., Ericaceae (bearberry leaves)as a green reducing agent for adsorbed Cu2+-ions. In order to provide sufficient number of carboxyl groups for complexationwith Cu2+-ions a two-step oxidation process with NaIO4 and NaClO2 was carried out. The influence of NaIO4 concentrationon content of carboxyl groups and Cu-based nanoparticles was studied by FTIR and AAS. HPLC analysis identified thegallic acid known as a reducing agent in bearberry leaves extract. FESEM and XRD analyses revealed that using bearberryleaves extract and gallic acid solution as reducing agents led to a formation of spherical Cu2O/CuO nanoparticles and CuOnanosheets, respectively. These nanoparticles and nanosheets provided excellent antibacterial activity against Gram-negativebacteria Escherichia coli and Gram-positive bacteria Staphylococcus aureus. Cytotoxicity on human keratinocyte cells wasshown to depend on their copper content.
-
Katarina Nešovi c,Ana Jankovic,Aleksandra Peri c-Gruji c,Maja Vukašinovic-Sekulic,Tamara Radeti c,Ljiljana Živkovi c,박수진,이경엽,Vesna Miškovi c-Stankovi c 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.77 No.-
Silver nanoparticles (AgNPs) were synthesized by in situ electrochemical reduction of Ag+ ions in poly(vinyl alcohol)/chitosan/graphene (PVA/CHI/Gr) hydrogel matrices with different concentrations ofchitosan. The physicochemical properties of nanocomposite hydrogels were investigated by UV–visspectroscopy (UV–vis), dynamic light scattering (DLS), transmission electron microscopy (TEM), X-rayphotoelectron spectroscopy (XPS),field-emission scanning electron microscopy (FE-SEM) and Fourier-transform infrared spectroscopy (FT-IR), thermal characteristics were determined by differentialscanning calorimetry (DSC) and mechanical properties were measured by tensile test. The swellingstudies were carried out in phosphate buffer to simulate natural physiological environment and datawerefitted by several kinetic models to determine the diffusion mechanism and diffusion coefficients ofthe swelling medium through the hydrogel matrices. It was shown that the presence of silvernanoparticles increased the uptake capability and equilibrium swelling degree of the compositehydrogels. The antibacterial activity was confirmed against Escherichia coli and Staphylococcus aureus,while the hydrogels without AgNPs exhibited antibacterial properties due to the presence of chitosan. With the addition of AgNPs, the samples showed stronger activity and fast reduction in the number ofcolonies, confirming the synergistic effect of chitosan and AgNPs on the antibacterial activity.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
