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Thirunavukkarasu Arunachalam, Muthukumaran Karpagasundaram and Nithya Rajarathinam

Abstract

Cerium oxide nanoparticles (CONPs) were prepared using ultrasound assisted leaf extract of Prosopis juliflora acting as a reducing as well as stabilizing agent. The synthesized CONPs were characterized by ultraviolet-visible absorption spectroscopy (UV-Vis), particle size analyzer (PSA), Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and high-resolution transmission electron microscopy (HRTEM). From the UV-Vis analysis, the optical band gap of the prepared CONPs (Eg = 3.62 eV) was slightly increased as compared to the bulk ceria (Eg = 3.19 eV). The phytochemicals in the extract reduced the particle size to 3.7 nm ± 0.3 nm, as it is evident from the PSA. FT-IR results confirmed the Ce-O stretching bands by showing the peaks at 452 cm-1. The Raman spectrumshowed a characteristic peak shift for CONPs at 461.2 cm-1. XRD analysis revealed the cubic fluorite structure of the synthesizednanoparticles with the lattice constant, a of 5.415 Å and unit cell volume, V of 158.813 Å3. XPS signals were used to determine the concentration of Ce3+ and Ce4+ in the prepared CONPs and it was found that major amount of cerium exist in the Ce4+ state. HRTEM images showed spherical shaped particles with an average size of 15 nm. Furthermore, the antibacterial activity of the prepared CONPs was evaluated and their efficacies were compared with the conventional antibiotics using disc diffusion assay against a set of Gram positive (G+) bacteria (Staphylococcus aureus, Streptococcus pneumonia) and Gram negative (G-) bacteria (Pseudomonas aeruginosa, Proteus vulgaris). The results suggested that CONPs showed antibacterial activity with significant variations due to the differences in the membrane structure and cell wall composition among the two groups tested.

Open access

A. Roguska, A. Belcarz, P. Suchecki, M. Andrzejczuk and M. Lewandowska

Problem of Post-operative infections of implant materials caused by bacterial adhesion to their surfaces is very serious. Enhancement of antibacterial properties is potentially beneficial for biomaterials value. Therefore, the metallic and metallic oxide nanoparticles attract particular attention as antimicrobial factors. The aim of this work was to create nanotubular (NT) oxide layers on Ti with the addition of ZnO nanoparticles, designed for antibacterial biomedical coatings. Antimicrobial activities of titanium, TiO2 NT and ZnO/TiO2 NT surfaces were evaluated against bacterial strain typical for orthopaedic infections: S. epidermidis. TiO2 NT alone killed the free bacterial cells significantly but promoted their adhesion to the surfaces. The presence of moderate amount of ZnO nanoparticles significantly reduced the S. epidermidis cells adhesion and viability of bacterial cells in contact with modified surfaces. However, higher amount of loaded nanoZnO showed the reduced antimicrobial properties than the medium amount, suggesting the overdose effect.

Open access

A. Roguska, A. Belcarz, P. Suchecki, M. Andrzejczuk and M. Lewandowska

Abstract

Problem of post-operative infections of implant materials caused by bacterial adhesion to their surfaces is very serious. Enhancement of antibacterial properties is potentially beneficial for biomaterials value. Therefore, the metallic and metallic oxide nanoparticles attract particular attention as antimicrobial factors. The aim of this work was to create nanotubular (NT) oxide layers on Ti with the addition of ZnO nanoparticles, designed for antibacterial biomedical coatings. Antimicrobial activities of titanium, TiO2 NT and ZnO/TiO2 NT surfaces were evaluated against bacterial strain typical for orthopaedic infections: S. epidermidis. TiO2 NT alone killed the free bacterial cells significantly but promoted their adhesion to the surfaces. The presence of moderate amount of ZnO nanoparticles significantly reduced the S. epidermidis cells adhesion and viability of bacterial cells in contact with modified surfaces. However, higher amount of loaded nanoZnO showed the reduced antimicrobial properties than the medium amount, suggesting the overdose effect.

Open access

P. Maddahi, N. Shahtahmasebi, A. Kompany, M. Mashreghi, S. Safaee and F. Roozban

Abstract

Sol-gel method was successfully used for synthesis of ZnO nanoparticles doped with 10 % Mg or Cu. The structure, morphology and optical properties of the prepared nanoparticles were studied as a function of doping content. The synthesized ZnO:(Mg/Cu) samples were characterized using XRD, TEM, FTIR and UV-Vis spectroscopy techniques. The samples show hexagonal wurtzite structure, and the phase segregation takes place for Cu doping. Optical studies revealed that Mg doping increases the energy band gap while Cu incorporation results in decrease of the band gap. The antibacterial activities of the nanoparticles were tested against Escherichia coli (Gram negative bacteria) cultures. It was found that both pure and doped ZnO nanosuspensions show good antibacterial activity which increases with copper doping, and slightly decreases with adding Mg.

Open access

Damian Wojcieszak, Michał Mazur, Danuta Kaczmarek, Agata Poniedziałek, Piotr Domanowski, Bogumiła Szponar, Aleksandra Czajkowska and Andrzej Gamian

the material [ 11 ]. In the literature there are many, often contradictory, reports on the activity of the various structure phases of TiO 2 . Usually, in the case of antibacterial properties the best efficiency exhibit films with mixed phase, where the content of anatase ranges between 70 and 75 %, while for rutile it is ca. 25 to 30 % [ 4 , 9 ]. The dispersion of these values is most probably a consequence of small differences in crystallite sizes, active surface area, number of defects, level of oxygen adsorption and number of hydroxyl groups on the surface [ 9

Open access

M. Bartmanski

., Silver release from silver-containing hydroxyapatite coatings, Surface and Coatings Technology. 205 (2010) 1892-1896. 21. Zhang W., Chu P.K., Enhancement of antibacterial properties and biocompatibility of polyethylene by silver and copper plasma immersion ion implantation, Surface and Coatings Technology. 203 (2008) 909-912. 22. Stanić V., Janaćković D., Dimitrijević S., Tanasković S.B., Mitrić M., Pavlović M.S., Krstić A., Jovanović D., Raičević S., Synthesis of antimicrobial monophase silver-doped hydroxyapatite nanopowders for bone

Open access

K. Rokosz, T. Hryniewicz and W. Malorny

biomaterial surface properties, The International Journal of Advanced Manufacturing Technology, (2015), DOI: 10.1007/s00170-015-8086-y 30. Simka W., Habilitation summary of professional accomplishments (in Polish). Silesian University of Technology (Wydział Chemiczny, Politechnika Śląska), Gliwice, Chemical Engineering Department, 2013, 1-18. 31. Jelinek M., Kocourek T., Remsa J., Weiserová M., Jurek K., Mikšovský J., Strnad J., Galandáková A., Ulrichováe J., Antibacterial, cytotoxicity and physical properties of laser-silver doped

Open access

K. Rokosz, T. Hryniewicz, Ł. Dudek, A. Schütz, J. Heeg and M. Wienecke

., Habilitation summary of professional accomplishments (in Polish). Silesian University of Technology (Wydział Chemiczny, Politechnika Śląska), Gliwice, Chemical Engineering Department, 2013, 1–18. 48. Jelinek M., Kocourek T., Remsa J., Weiserová M., Jurek K., Mikšovský J., Strnad J., Galandáková A., Ulrichováe J., Antibacterial, cytotoxicity and physical properties of laser-silver doped hydroxyapatite layers, Materials Science and Engineering: C, 33(3) (2013), 1242–1246. 49. Mishra G., Dash B., Pandey S., Mohanty P.P., Antibacterial actions of silver nanoparticles

Open access

A. Kausar

antibacterial properties of polyacrylonitrile/ferric chloride nanocomposite fibers by electrospinning. International Journal of Polymer Analysis and Characterization 15(2010) 110-118. 30. Beyli, P.T., Doğan, M., Gündüz, Z., Alkan, M. and Turhan, Y.: Synthesis, Characterization and Their Antimicrobial Activities of Boron Oxide/Poly (Acrylic Acid) Nanocomposites: Thermal and Antimicrobial Properties. Advances in Materials Science 18(2018), 28-36. 31. Kausar, A.: Polyamide 1010/Polythioamide Blend Reinforced with Graphene Nanoplatelet for Automotive Part Application

Open access

M. Zalewska and M. Szafran

Abstract

The main purpose of this study was to perform ceramic composite materials with active filter layers which could be applied in the process of elimination viruses imitating particles from water. In this study, the method of obtaining the active layer on the surface of the ceramic porous materials was developed and simulation of the filtration process using polymer dispersion characterized by similar size of particles to the size of viruses and negative charge at the pH of drinking water as it is in the case of viruses was carried out. In order to obtain ceramic composite materials, two types of zinc oxide were used. Application of ZnO is also beneficial because of their low toxicity to human and antibacterial properties.