On Biomimetics by Lilyana Pramatarova

On Biomimetics
284

0

0.1

0.2

0.3

0.4

0.5

0.6

10 15 20 25 30 35 40 45 50

Δ

Transmittance

Temperature[]。C

[]%

15 C。 21 C。

27 C。

33 C。

39 C。

45 C。

0

0.1

0.2

0.3

0.4

0.5

0.6

10 15 20 25 30 35 40 45 50

Δ

Transmittance

TemperatureTemperature[][]。CC

[][]%%

15 C15 C。。 21 C21 C。。

27 C27 C。。

33 C33 C。。

39 C39 C。。

45 C45 C。。

(A)

0

50

100

150

200

250

300

10 15 20 25 30 35 40 45 50

Temperature

15 C。

21 C

。

27 C。 33 C。 39 C

。

45 C。

[]。C

Period

[

]

S

0

50

100

150

200

250

300

10 15 20 25 30 35 40 45 50

Temperature

15 C15 C。。

21 C

。

21 C

。

27 C27 C。。 33 C33 C。。 39 C

39 C。。

45 C45 C。。

[]。C

Period

[

]

S

Period

[

]

S

(B)

Fig. 6. Dependence of amplitude (A) and period (B) on temperature for the poly-(NIPAAm-
co-Ru(bpy) 3 -co-MAPTAC) solutions under the oxidant free-condition. (Reprinted ref. 36,
Copyright American Chemical Society. Reproduced with permission.)

Figure 6 shows the amplitude (ΔT%) and the period of the self-oscillation in the several
temperature conditions. In all temperature conditions, the amplitude of the self-oscillation
is significantly smaller than that of the conventional-type and AMPS-containing self-
oscillating polymer solution [33-35]. That is because the driving force of the aggregation-
disaggregation self-oscillation is smaller compared to the other self-oscillating polymer
chains due to the hydrophilic 65 wt% MAPTAC component. In addition, the small
amplitude is considerably affected by the amount of the BrO 3 - in the BZ reaction in
accordance with the FKN mechanism as the same manner of the AMPS-containing
polymer chain (See Figure 2 and 3). That is because, in this condition, the oxidizing agent
was supplied only by the polymer chain. Moreover, as shown in Figure 6(B), the period
decreases with increasing temperature. This is a general tendency for the BZ reaction as
well known phenomena that the period typically follows the Arrhenius equation.