TY - JOUR
T1 - Enhancement of the antimicrobial properties of orthorhombic molybdenum trioxide by thermal induced fracturing of the hydrates
AU - Shafaei, Shahram
AU - Van Opdenbosch, Daniel
AU - Fey, Tobias
AU - Koch, Marcus
AU - Kraus, Tobias
AU - Guggenbichler, Josef Peter
AU - Zollfrank, Cordt
N1 - Publisher Copyright:
© 2015 Elsevier B.V.
PY - 2016/1/1
Y1 - 2016/1/1
N2 - The oxides of the transition metal molybdenum exhibit excellent antimicrobial properties. We present the preparation of molybdenum trioxide dihydrate (MoO3 × 2H2O) by an acidification method and demonstrate the thermal phase development and morphological evolution during and after calcination from 25 °C to 600 °C. The thermal dehydration of the material was found to proceed in two steps. Microbiological roll-on tests using Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa were performed and exceptional antimicrobial activities were determined for anhydrous samples with orthorhombic lattice symmetry and a large specific surface area. The increase in the specific surface area is due to crack formation and to the loss of the hydrate water after calcination at 300 °C. The results support the proposed antimicrobial mechanism for transition metal oxides, which based on a local acidity increase as a consequence of the augmented specific surface area.
AB - The oxides of the transition metal molybdenum exhibit excellent antimicrobial properties. We present the preparation of molybdenum trioxide dihydrate (MoO3 × 2H2O) by an acidification method and demonstrate the thermal phase development and morphological evolution during and after calcination from 25 °C to 600 °C. The thermal dehydration of the material was found to proceed in two steps. Microbiological roll-on tests using Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa were performed and exceptional antimicrobial activities were determined for anhydrous samples with orthorhombic lattice symmetry and a large specific surface area. The increase in the specific surface area is due to crack formation and to the loss of the hydrate water after calcination at 300 °C. The results support the proposed antimicrobial mechanism for transition metal oxides, which based on a local acidity increase as a consequence of the augmented specific surface area.
KW - Antimicrobial properties
KW - Molybdenum trioxide
KW - Transition metal oxide
UR - http://www.scopus.com/inward/record.url?scp=84942465451&partnerID=8YFLogxK
U2 - 10.1016/j.msec.2015.09.069
DO - 10.1016/j.msec.2015.09.069
M3 - Article
C2 - 26478404
AN - SCOPUS:84942465451
SN - 0928-4931
VL - 58
SP - 1064
EP - 1070
JO - Materials Science and Engineering C
JF - Materials Science and Engineering C
M1 - 5781
ER -