Jian Hong, De-xia Zhou, Hong-xing Hao, Min Zhao, Hong-tao Bian. Ultrafast Infrared Spectroscopic Study of Microscopic Structural Dynamics in pH Stimulus-Responsive Hydrogels†[J]. Chinese Journal of Chemical Physics, 2020, 33(5): 540

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- Chinese Journal of Chemical Physics
- Vol. 33, Issue 5, 540 (2020)

Fig. 1. (a) Swelling behavior of the poly(DMAEMA-co-AA) hydrogels with time under different pH conditions. (b) pH dependence of the equilibrium swelling ratio (ESR) for the poly(DMAEMA-co-AA) hydrogels

Fig. 1. The reaction route to prepare the poly(DMAEMA-co-AA) hydrogels.

Fig. 2. Swelling kinetic in the poly(DMAEMA-co-AA) hydrogels under different pH conditions. The solid lines are the fitting curves with the expression of ln(SR) = ln + ln
![Normalized FTIR spectra of CN stretching in the SCN- anionic probe dissolved in the poly(DMAEMA-co-AA) hydrogels with different pH. The solid lines are the fitting curves using a pseudo-Voigt function [25, 38]. The background signal of poly(DMAEMA-co-AA) without the addition of SCN- has been subtracted](/Images/icon/loading.gif)
Fig. 3. Normalized FTIR spectra of CN stretching in the SCN- anionic probe dissolved in the poly(DMAEMA-co-AA) hydrogels with different pH. The solid lines are the fitting curves using a pseudo-Voigt function [25, 38]. The background signal of poly(DMAEMA-co-AA) without the addition of SCN- has been subtracted

Fig. 4. (a) Vibrational relaxation for the CN stretching of the SCN- anionic probe in the poly(DMAEMA-co-AA) hydrogels under different pH conditions. The solid lines are the fitting curves using a biexponential decay function. (b) pH dependent vibrational lifetime constants of SCN- probe in the poly(DMAEMA-co-AA) hydrogels

Fig. 5. (a) Rotational anisotropy decay of SCN- anionic probe in the poly(DMAEMA-co-AA) hydrogels under different pH conditions. The solid lines are the fitting curves using a biexponential decay function. (b) pH dependence of the rotational time constants of the SCN- probe in the poly(DMAEMA-co-AA) hydrogels.
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Table 1. Swelling parameters of the poly(DMAEMA-co-AA) hydrogels under different pH conditions
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Table 2. Rotational time constants of the SCN- anion in the poly(DMAEMA-co-AA) hydrogels under different pH conditions
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