Optimisation of preparation conditions for Ti nanowires and suitability as an antibacterial material
2017
Ultrafine titanium dioxide (TiO
2
) nanowires were synthesised using a hydrothermal method with different volumes of ethylene glycol (EG) and annealing temperatures. It shows that sodium titanate nanowires synthesised using 5 and 10 ml EG, which annealed at 400°C produced TiO
2
nanowires that correspond to a photochemically active phase, which is anatase. The influences of annealing temperatures (400-600°C) on the morphological arrangement of TiO
2
nanowires were evident in the field emission scanning electron microscopy. The annealing temperature of 500°C led to agglomeration, which formed a mixture of TiO
2
nanoparticles and nanowires. High thermal stability of TiO
2
nanowires revealed by thermogravimetric analysis and Fourier transform infrared spectroscopy spectrum showed the presence of the Ti-O-Ti vibrations as evidenced due to TiO
2
lattices. An antibacterial study using TiO
2
nanowires toward
Escherichia coli
and
Klebsiella pneumoniae
showed large zones of inhibition that indicated susceptibility of the microbe toward TiO
2
. Growth kinetic analysis shows that addition of TiO
2
has reduced optical density (OD) suggesting an inhibition of the growth of bacteria. These results indicate TiO
2
nanowires can be effectively used as an antimicrobial agent against gram-bacteria. The TiO
2
nanowires could be exploited in the medical, packaging and detergent formulation industries and wastewater treatment.
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