2024-03-28T21:25:50Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/2029672022-12-15T08:22:56Zcom_10261_36com_10261_4com_10261_78com_10261_3col_10261_289col_10261_331
http://hdl.handle.net/10261/202967
10.1021/acsami.9b10690
383453
Highly Efficient Antimicrobial Ceramics Based on Electrically Charged Interfaces
American Chemical Society
2019
artículo
Jiménez Reinosa, Julián
rp14057
Muñoz Rojo, Miguel
Campo, Ángel Adolfo del
rp13412
Martín-González, Marisol
rp14762
Fernández Lozano, José Francisco
rp13405
Reinosa, Julián J. [0000-0003-1230-2236]
Muñoz Rojo, Miguel [0000-0001-9237-4584]
Martín-González, Marisol [0000-0002-5687-3674]
Fernández Lozano, José Francisco [0000-0001-5894-9866]
Ceramic tile
Antimicrobial properties
Feldspar crystallizations
Surface charge
Physical mechanisms
2019-09-27
The increasing threat of multidrug-resistant microorganisms is a cause of worldwide concern. This motivates a necessity to discover new antimicrobial agents or new mechanisms for microorganism eradication, different from those currently used. Here, we report an effective antibacterial ceramic glaze that combines different bactericidal mechanisms. Specifically, the used methodology of the glaze results in glass-free edge crystallizations of feldspar structures at the ceramic surface. A combination of Rutherford backscattering spectroscopy, scanning electron microscopy, and Raman microscopy is used to determine the chemical elements and crystallizations at the ceramic surface. Moreover, Kelvin probe force microscopy demonstrates that the presence of glass-free edges in feldspar needle crystals (semiconductor phase) on a glass matrix (insulator phase) promotes the formation of semiconductor-insulator interface barriers. These barriers act as reservoirs of electric charges of ∼1.5 V, producing a discharge exceeding the microorganism membrane breakdown value (up to 0.5 V). Furthermore, the surface crystallizations account for the formation of a microroughness that limits biofilm formation. Both factors result in high antibacterial activity in the range of R > 4 for Escherichia coli and Staphylococcus aureus. This approach opens new possibilities to attain bactericidal surfaces and to understand the role of physical interaction as a main antimicrobial mechanism.
Ministerio de Ciencia, Innovación y Universidades (España)
Agencia Estatal de Investigación (España)
ACS Applied Materials and Interfaces
2019
11
39254
39262