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Inhibition of sulfate-reducing bacteria influenced corrosion on hydrophobic poly(dimethylsiloxane)coatings

Journal of Materials Science & Technology 2020年第17期52卷 198-206页

作者： innocent o.arukalam C.N.Njoku Lihui Yang Baorong Hou Ying Li Corrosion and Protection Division Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Shenyang National Laboratory for Materials Science Northeastern UniversityShenyang 110819China Department of Polymer and Textile Engineering Federal University of TechnologyP.M.B.1526 Owerri Nigeria Key Laboratory of Marine Environmental Corrosion and Bio-fouling Institute of OceanologyChinese Academy of SciencesQingdao 266071China open Studio for Marine Corrosion and Protection Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Advanced Functional Materials/Corrosion Research Group Africa Centre of Excellence in Future Energies and Electrochemical Systems(ACE-FUELS)Federal University of Technology Owerri(FUTO)Nigeria

Sulfate-reducing bacteria(SRB)has been pointed out as one of the causative agents of microbial induced corrosion in the marine *** address this problem,novel strategies are being experimented as against the earlier methods which have been banned due to their toxic effects on useful aquatic ***,the aim of this study was to investigate the effect of non-toxic perfluorodecyltrichlorosilane(PFDTS)on resistance of hydrophobic poly(dimethylsiloxane)/phosphoric acid-treated zinc oxide(PDMS/PA-treated Zno)coatings to SRB-induced biofouling and *** surface features of the coatings before and after exposure to SRB/NaCl solution were analyzed by scanning electron microscopy(SEM).Wettability of the coatings before and after exposure was also *** interaction of SRB with the coatings was investigated by FTIR *** resistance performance of the modified coatings against SRB-induced corrosion was monitored by electrochemical impedance spectroscopy(EIS).The EIS measurements revealed that 0.20 g PFDTS-based coating displayed highest corrosion resistance with impedance modulus of 6.301×10^10 after 15 d of exposure to SRB/NaCl *** results were corroborated by surface and chemical interaction analyses,and thus,indicate that 0.20 g PFDTSmodified PDMS/PA-treated Zno coating has potentials for excellent SRB-induced corrosion resistance and anti-biofouling performance.

关键词： Corrosion Hydrophobic coating Perfluorodecyltrichlorosilane Poly(dimethylsiloxane) Sulfate-reducing bacteria

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Investigating the Bioburden of “Neglected” Hospital Low Contact Surfaces

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Advances in Microbiology 2022年第5期12卷 316-326页

作者： Sixtus A. okafor innocent C. Ekuma Chioma C. okey-Mbata Uche L. Ezeamaku Afoma L. okafor Felicity N. arukalam Ebere o. Eziefuna Department of Biomedical Technology Federal University of Technology Owerri Nigeria Department of Biomedical Engineering Alex Ekwueme Federal University Teaching Hospital Abakaliki Nigeria Department of Polymer and Texile Engineering Federal University of Technology Owerri Nigeria

Microbes inhabit every surface, reproduce, and if undisturbed, could form biofilm. Hospital contact surfaces have been reported to play a major role in the spread of healthcare-acquired infections (HAIs). Most studies on these surfaces as a route for the spread of nosocomial infections have focused on the high-contact surfaces. There is a paucity of information on the bioburden of “neglected” low-contact surfaces such as bedside bible, ward television, and ward clock, etc. This study was carried out to investigate the bioburden of “neglected” low-contact hospital surfaces and compare it with that of the high-contact surfaces. Using a sterile swab stick moistened in normal saline, we collected 400 samples from contact surfaces of 20 randomly selected hospitals in owerri, southeast in Nigeria, and by standard microbiological methods and with reference to standard identification manuals, microbial species were isolated and characterized. The results show that the mean of the bioburden in cfu/square swabbed surface of these “neglected” low-contact surfaces is significantly higher (p = 0.005) than that of the high-contact surfaces which may be a result of target hygienic cleaning, with attention on the high-contact surfaces and the low-contact surfaces are often “neglected”. This result gives an insight into the continued prevalence of hospital-acquired infections as these “neglected” low-contact surfaces continue to serve as a reservoir for pathogenic microbes and a source of continued microbial contamination of hospital surfaces. It therefore calls for a revamp of existing hospital cleaning protocols and redesigning of cleaning regimes.

关键词： Cleaning Contact Infections Microbiota and Surfaces

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