Silver Nanoparticles in SiO2 Microspheres - Preparation by Spray Drying and Use as Antimicrobial Agent.
Silver nanoparticles embedded in SiO2 particles of micrometer size are prepared using spray drying. The spray drying is performed with a SiO2 sol (solvent water:ethanol 4: 1) containing SiO2 and silver particles of nanometer size. During spray drying the SiO2 nanoparticles aggregate to SiO2 microspheres whereas the silver particles exhibit only a small tendency of aggregation and keep their nanometer size. However under special conditions also the formation of crystalline silver rods is observed. The antibacterial activity of the resulting Ag/SiO2 powders is determined against the bacteria Escherichia coli and Bacillus subtilis. Because of this antibacterial acitivity and the fact that the powder of SiO2 microspheres exhibits a good dispersibility, such materials have an immense potential to be used as antimicrobial additive in processes like master batch or fiber production.
Boris
B
Mahltig
Helfried
H
Haufe
Kerstin
K
Muschter
Anja
A
Fischer
Young Hwan
YH
Kim
Emanuel
E
Gutmann
Marianne
M
Reibold
Dirk Carl
DC
Meyer
Torsten
T
Textor
Chang Woo
CW
Kim
Young Soo
YS
Kang