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|Abstract:||Porous ceramic water filters (CWFs), produced by sintering a mixture of clay and a combustible material (such as woodchips), are often used in point-of-use water filtration systems that occlude microbes by size exclusion. They are also coated with colloidal silver, which serves as a microbial disinfectant. However, the adhesion of microbes to porous clay surfaces and colloidal silver coated clay surfaces has not been studied. This paper presents the results of atomic force microscopy (AFM) measurements of the adhesion force between Escherichia coli bacteria, colloidal silver, and porous clay-based ceramic surfaces. The adhesion of silver and copper nanoparticles is also studied in control experiments on these alternative disinfectant materials. The adhesive force between the wide range of possible bi-materials was measured using pull-off measurements during force microscopy. These were combined with measurements of AFM tip radii/substrate roughness that were incorporated into adhesion models to obtain the adhesion energies for the pair wise interaction. Of the three antimicrobial metals studied, the colloidal silver had the highest affinity for porous ceramic surface (125 ± 32 nN and ∼0.29 J/m2) while the silver nanoparticles had the highest affinity for E. coli bacteria (133 ± 21 nN and ∼0.39 J/m2). The implications of the results are then discussed for the design of ceramic water filter that can purify water by adsorption and size exclusion.|
|Citation:||Yakub, I., and W. O. Soboyejo. "Adhesion of E. coli to silver-or copper-coated porous clay ceramic surfaces." Journal of Applied Physics 111, no. 12 (2012): 124324. doi: 10.1063/1.4722326|
|Type of Material:||Journal Article|
|Journal/Proceeding Title:||Journal of Applied Physics|
|Version:||Final published version. Article is made available in OAR by the publisher's permission or policy.|
|Notes:||This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Yakub, I., and W. O. Soboyejo. "Adhesion of E. coli to silver-or copper-coated porous clay ceramic surfaces." Journal of Applied Physics 111, no. 12 (2012): 124324. and may be found at http://dx.doi.org/10.1063/1.4722326|
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