Fabrication and antibacterial properties of ZnO–alginate nanocomposites

Trandafilović, Lidija V.; Božanić, Dušan K.; Dimitrijević-Branković, Suzana; Luyt, A. S.; Djoković, Vladimir

doi:10.1016/j.carbpol.2011.12.005

Cited by 120 publications

(46 citation statements)

References 61 publications

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“…The novel properties of nanoscale zinc oxide particles have found applications in a variety of applications such as luminescence [1][2][3], varistors [4,5], solar cells [6], gas sensors [7,8]. Many of the synthetic approaches such as sol-gel method [13], co-precipitation [12], hydrothermal method [14], microwave synthesis [9][10][11], and thermal evaporation method [15] have been used for the preparation of ZnO powders. Amongst the different methods of synthesis of ZnO nanostructures, the sol-gel method is attractive for its simplicity and environmentfriendly conditions.…”

Section: Introductionmentioning

confidence: 99%

Multiple-layered structure of obelisk-shaped crystalline nano-ZnO prepared by sol–gel route

2015

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Zinc oxide nanopowders were synthesized by the simple sol-gel method from an ethanol solution of zinc nitrate hexahydrate. Structural and surface morphological investigations were carried out using X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), scanning electron microscopy, Fourier transform infrared spectroscopy (FTIR) and ultraviolet-visible (UV-Vis) spectrophotometry analyses. XRD pattern showed that the zinc oxide nanoparticles exhibited hexagonal wurtzite structure. A multiple-layered structure of obelisk-shaped ZnO nanoparticles was achieved after calcinations. The average particle size of ZnO was around 20 nm as estimated by direct HRTEM observation. The size of sphere-like shaped ZnO nanoparticles was measured in the range of 20-80 nm and the size of pyramid-like shaped annealed samples was achieved in the range of 40-100 nm with less agglomeration. The energy dispersive spectroscopy spectrum showed peaks of zinc and oxygen. The sharp peaks in FTIR spectrum determined the Zn-O stretching and absorbance peak of UV-Vis spectrum showed the wide bandgap energy of 3.35 eV.

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Section: Introductionmentioning

confidence: 99%

Multiple-layered structure of obelisk-shaped crystalline nano-ZnO prepared by sol–gel route

2015

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“…for development of Alginate nanocomposite films [4][5][6] . for development of Alginate nanocomposite films [4][5][6] .…”

Section: Introductionmentioning

confidence: 99%

Property relationship of alginate and alginate–carbon dot nanocomposites with bivalent and trivalent cross-linker ions

Konwar

Chowdhury

2015

RSC Adv.

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Synthesis of nanocomposites of biopolymer is answer to obtaining superior properties which are biocompatable but also possessing good mechanical properties. In this work we made an attempt to study the property relationship of Alginate and Alginate-carbon dot nanocomposites with different bivalent and trivalent cross-linker ions. Biopolymer Alginate were crosslinked with five different bivalent and trivalent metal ions and their corresponding carbon-dots (CDs) nanocomposites have been prepared successfully. The carbon dots were prepared from Commercially available 'Assam Tea'. The Alginate and Alginate-carbon dot nanocomposite films were characterized with UV-visible spectroscopy, FTIR, SEM, fluorescent microscopy. The tensile strengths measurements of all the film samples have been carried out. It was observed that Alginate films crosslinked by metal ions with larger size ( Ba 2+ ) show higher tensile strength and higher thermostability. Tensile strength values for Ba 2+ crosslinked Alginate films increased from 24.5 MPa to 43.5 MPa and weight loss at 200 0 C decreased upto 9% on incorporatopn of 2% CDs. Moreover loading of carbon-dots in the crosslinked Alginate system leads to higher absorption in the UV region showing the potential use of Alginate -carbon dot films as UV blocker. For Ca 2+ and Ba 2+ crosslinked films minimum transmittance value significantly reduces to 4 and 5% respectively in the region from 200 to 400 nm for nanocomposite films with maximum 2% CDs. Some mechanastic aspect of superior property shown by Ba 2+ croasslinked Alginate and Alginate-carbon dot nanocomposite is also discussed.

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“…The development in modern medical science has improved biomaterials role in replacing damaged tissue, organs, and improving their functions. Hydroxyapatite (HAP) one of the apatite minerals with a chemical formula of (Ca 10 (PO 4 ) 6 (OH) 2 ), is a major inorganic constituent about 60-70 % of the inorganic portion of the bone matrix and possesses the high ability of ion-exchange against various cations which make that HAP has high biocompatibility and bioactivity properties [7][8][9][10]. Besides HAP can be used in a wide range of applications such as bone substitution, fertilizers, food supplements as a source of calcium, dental materials, drug delivery agent, gene carriers biology, adsorbent of liquid chromatography and proteins, catalysts, ion exchangers, removal of organic pollutants like phenol and other divalent metal cations, gas sensors, proton conductors and more [4,5].…”

Section: Introductionmentioning

confidence: 99%