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.
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15 June 2012
Research Article|
June 26 2012
Adhesion of E. coli to silver- or copper-coated porous clay ceramic surfaces
I. Yakub;
I. Yakub
1Princeton Institute for the Science and Technology of Materials,
Princeton University
, Princeton, New Jersey 08544, USA
2Department of Mechanical and Aerospace Engineering,
Princeton University
, Princeton, New Jersey 08544, USA
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W. O. Soboyejo
W. O. Soboyejo
a)
1Princeton Institute for the Science and Technology of Materials,
Princeton University
, Princeton, New Jersey 08544, USA
2Department of Mechanical and Aerospace Engineering,
Princeton University
, Princeton, New Jersey 08544, USA
Search for other works by this author on:
a)
Author to whom correspondence should be addressed. Electronic mail: [email protected]. Tel.: (609) 258-5609. Fax: (609) 258-5877.
J. Appl. Phys. 111, 124324 (2012)
Article history
Received:
January 22 2012
Accepted:
April 27 2012
Citation
I. Yakub, W. O. Soboyejo; Adhesion of E. coli to silver- or copper-coated porous clay ceramic surfaces. J. Appl. Phys. 15 June 2012; 111 (12): 124324. https://doi.org/10.1063/1.4722326
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