Microstructure and Antimicrobial Properties of Bioactive Cobalt Co-Doped Copper Aluminosilicate Nanocrystallines
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ORIGINAL PAPER
Microstructure and Antimicrobial Properties of Bioactive Cobalt Co-Doped Copper Aluminosilicate Nanocrystallines Amany M. El Nahrawy 1
&
Bahaa A. Hemdan 2 & Ali B. Abou Hammad 1 & Akebe Luther King Abia 3 & Ahmed M. Bakr 4
Received: 25 August 2019 / Accepted: 12 November 2019 # Springer Nature B.V. 2019
Abstract Eco-friendly copper aluminosilicate nanoparticles doped with cobalt nanoparticles were prepared via the sol-gel route. The samples were calcined at 800 °C to induce high crystallization, which would potentially enhance their structural, spectroscopic and antimicrobial properties. Structural and spectroscopic characterization were measured using X-ray diffraction, Field emission-scanning electron microscopy, Fourier Transformed Infrared, UV-Vis-absorbance and UV/Vis diffuse reflectance spectra. The product revealed the formation of a crystalline cubic phase of (CAS) and orthorhombic (β-Co2SiO4) phase. The antimicrobial susceptibility testing of nanocrystalline CAS, 5Co-CAS and 9Co-CAS as magnetic nanocomposites was evaluated using agar diffusion and broth dilution methods against Escherichia coli, Salmonella enterica, Pseudomonas aeruginosa, Listeria monocytogenes, Staphylococcus aureus, Enterococcus faecalis, Candida albicans, and Aspergillus niger. The toxicity assays for each antiseptic were also conducted. The incorporation of cobalt ions in the silicate base material was observed to be highly cross-linked during the formation process. UV-Vis-absorbance for the samples gave a red shift and noticeable increases in the band gap with the values 1.42, 1.43, 1.52 and 1.50 eV, respectively. The results showed that 9Co-CAS was the most potent antiseptic followed by 5Co-CAS and CAS. Keywords Sol-gel route . Silicate nanocomposite . Spectroscopic properties . Antimicrobial testing . Minimum inhibitory concentration . Toxicity assays
1 Introduction The spread of microbial pathogens in the environment, particularly antibiotic-resistant ones, may have significant adverse health implications, especially when they come into contact with humans. Numerous factors can affect this proliferation, the most significant being their ability * Amany M. El Nahrawy [email protected] 1
Solid-State Physics Department, Physics Research Division, National Research Centre, 33 El-Bohouth St., Dokki, Giza 12622, Egypt
2
Water Pollution Research Department, Environmental Research Division, National Research Centre, 33 El-Bohouth St., Dokki, Giza 12622, Egypt
3
Antimicrobial Research Unit, College of Health Sciences, University of KwaZulu-Natal, Private Bag X54001, Durban 4000, South Africa
4
Spectroscopy Department, Physics Research Division, National Research Centre, 33 El Bohouth St., Dokki, Giza 12622, Egypt
to survive in various environmental matrices and surfaces [1]. Sanitizing agents using chemicals, for example, has been shown to be effective in removing microorganisms; however, some of these methods are ineffective, leaving behind some residual organisms after disinfection [2, 3]. Some dis
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