N
N 0
=
1, T T lag
e
2 KC
n T , T > T lag
ð2:12Þ
2.4.4 Homs Model
Like Chick-Watson model, the Homs model, which was proposed in 1972 (Hom)
also considers concentration-time factor and has an additional power factor ‘m’ as
shown in Eq. 2.13 The model accounts for the lag or tailing off process in
Fig. 2.3 (A) Images of surviving luminescent bacteria that were able to yield colonies after
exposure to UV-light on Si-monocrystal substrates (upper block of panels) or on nano TiO 2 thin
films (lower block of panels). Different sectors of agar plates show the colonies of luminescent
bacteria in 15 lL of 102, 103 and 104-fold dilutions of UV-exposed bacterial suspension. Inset on
each image is an SEM image of the bacteria after respective exposure conditions. SEM images show
considerable morphological changes of bacterial cells already after 10-min UV-irradiation on nanoTiO 2 thin film. (Joost et al. 2015), (B) Schematic representation of the photocatalytic bacterial
disinfection. (Podporska-Carroll et al. 2015), (C & D) FESEM images of the obtained TiO 2 nanorod
spheres: (a) TiO 2 –400, (b) TiO 2 –500, (c) TiO 2 –600, (d) TiO 2 –700, (e) TiO 2 –800, and (f) TiO 2 –900
(numbers indicate the calcination temperature [
o
C]) & FESEM images at different magnifications of
(a, b) control rodlike E. coli corpses, and (c, d) a mixture of rod-like E. coli corpses and TiO 2 –500
after mixing for 2 h. (Bai et al. 2013)
36
R. P. Antony et al.
N 0
=
1, T T lag
e
2 KC
n T , T > T lag
ð2:12Þ
2.4.4 Homs Model
Like Chick-Watson model, the Homs model, which was proposed in 1972 (Hom)
also considers concentration-time factor and has an additional power factor ‘m’ as
shown in Eq. 2.13 The model accounts for the lag or tailing off process in
Fig. 2.3 (A) Images of surviving luminescent bacteria that were able to yield colonies after
exposure to UV-light on Si-monocrystal substrates (upper block of panels) or on nano TiO 2 thin
films (lower block of panels). Different sectors of agar plates show the colonies of luminescent
bacteria in 15 lL of 102, 103 and 104-fold dilutions of UV-exposed bacterial suspension. Inset on
each image is an SEM image of the bacteria after respective exposure conditions. SEM images show
considerable morphological changes of bacterial cells already after 10-min UV-irradiation on nanoTiO 2 thin film. (Joost et al. 2015), (B) Schematic representation of the photocatalytic bacterial
disinfection. (Podporska-Carroll et al. 2015), (C & D) FESEM images of the obtained TiO 2 nanorod
spheres: (a) TiO 2 –400, (b) TiO 2 –500, (c) TiO 2 –600, (d) TiO 2 –700, (e) TiO 2 –800, and (f) TiO 2 –900
(numbers indicate the calcination temperature [
o
C]) & FESEM images at different magnifications of
(a, b) control rodlike E. coli corpses, and (c, d) a mixture of rod-like E. coli corpses and TiO 2 –500
after mixing for 2 h. (Bai et al. 2013)
36
R. P. Antony et al.