Functional Surfaces in Biology III by Stanislav N. Gorb & Elena V. Gorb

Author:Stanislav N. Gorb & Elena V. Gorb
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

On LL, the oil drops spread very quickly over the surface during the first several up to 10 s, then did not change in shape for a short time and afterwards started to shrink/disappear (Fig. 6.3 (LL)). The drop base increased extremely fast during the first few (up to maximum 10) seconds by 41–160% of the initial value, then decreased either slightly (only by 10% of the maximal value) or greatly (by 40–75% of the maximal value) (Fig. 6.6a). The drop height decreased by 73–95% of the initial value: first (from several to up to 10 s) faster, then slower (Fig. 6.6b). The great decrease in the drop volume (by 32–94% of the initial value) occurred during the “quick” stage at small (0–10 s) times (exponential function ln(V/V 0 ) = γt with γ = −0.0644 ± 0.0262) and the “slow” stage at larger times (power-law function ln(V/V 0 ) = αln(t) with α = −0.5100 ± 0.1790) (Fig. 6.6c–e). The intermediate stage 2 was either not present or very short.

Fig. 6.6Modification of the oil drops on the one-layered wax sample of the pitcher LL. (a–c) Time-dependant values of the base (a), height (b) and volume of the drop (c). (d, e) Log-linear (d) and log-log plots (e) of the time-dependence of the change in the oil drop volume V/V 0 . The straight black lines touching the experimental curves in (d) and (e) correspond to the exponential and scaling dependencies in different time intervals, respectively

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