Hydrogels show versatile properties and are of great interest in the fields of bioelectronics and tissue engineering. Understanding the dynamics of the water molecules trapped in the three-dimensional polymeric networks of the hydrogels is crucial to elucidate their mechanical and swelling properties at the molecular level. In this report, the poly(DMAEMA-co-AA) hydrogels were synthesized and characterized by the macroscopic swelling measurements under different pH conditions. Furthermore, the microscopic structural dynamics of pH stimulus-responsive hydrogels were studied using FTIR and ultrafast IR spectroscopies from the viewpoint of the SCN− anionic solute as the local vibrational reporter. Ultrafast IR spectroscopic measurements showed the time constants of the vibrational population decay of SCN− were increased from 14±1 ps to 20±1 ps when the pH of the hydrogels varied from 2.0 to 12.0. Rotational anisotropy measurements further revealed that the rotation of SCN− anionic probe was restricted by the three-dimensional network formed in the hydrogels and the rotation of SCN− anionic probe cannot decay to zero especially at the pH of 7.0. These results are expected to provide a molecular-level understanding of the microscopic structure of the cross-linked polymeric network in the pH stimulus-responsive hydrogels.
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October 2020
Research Article|
October 01 2020
Ultrafast infrared spectroscopic study of microscopic structural dynamics in pH stimulus-responsive hydrogels†
Jian Hong;
Jian Hong
Key Laboratory of Applied Surface and Colloid Chemistry, Ministry
of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal
University
, Xi’an 710119, China
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De-xia Zhou;
De-xia Zhou
Key Laboratory of Applied Surface and Colloid Chemistry, Ministry
of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal
University
, Xi’an 710119, China
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Hong-xing Hao;
Hong-xing Hao
Key Laboratory of Applied Surface and Colloid Chemistry, Ministry
of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal
University
, Xi’an 710119, China
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Min Zhao;
Min Zhao
Key Laboratory of Applied Surface and Colloid Chemistry, Ministry
of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal
University
, Xi’an 710119, China
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Hong-tao Bian
Hong-tao Bian
*
Key Laboratory of Applied Surface and Colloid Chemistry, Ministry
of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal
University
, Xi’an 710119, China
*Author to whom correspondence should be
addressed. E-mail: htbian@snnu.edu.cn
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*Author to whom correspondence should be
addressed. E-mail: htbian@snnu.edu.cn
†
Part of the special issue for “the Chinese Chemical Society’s 16th National Chemical Dynamics Symposium”.
Chin. J. Chem. Phys. 33, 540–546 (2020)
Article history
Received:
June 13 2020
Accepted:
July 13 2020
Citation
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. Chin. J. Chem. Phys. 1 October 2020; 33 (5): 540–546. https://doi.org/10.1063/1674-0068/cjcp2006096
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