Significant Interfacial Dielectric Relaxation of Covalently Bonded Ice-Hydrogels
Hydrogels are composed of a three-dimensional network of cross-linked hydrophilic polymer chains and large amounts of water. The physicochemical properties of the polymer-water interface in hydrogels draw our attention. Due to the complex structure of hydrogel systems, it is still a challenge to inv...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2022-06-01
|
| Series: | Gels |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2310-2861/8/7/409 |
| _version_ | 1827623598977712128 |
|---|---|
| author | Yongqiang Li Liufang Chen Chuanfu Li Lin Lin Zhibo Yan Junming Liu |
| author_facet | Yongqiang Li Liufang Chen Chuanfu Li Lin Lin Zhibo Yan Junming Liu |
| author_sort | Yongqiang Li |
| collection | DOAJ |
| description | Hydrogels are composed of a three-dimensional network of cross-linked hydrophilic polymer chains and large amounts of water. The physicochemical properties of the polymer-water interface in hydrogels draw our attention. Due to the complex structure of hydrogel systems, it is still a challenge to investigate the interfacial layer properties of hydrogels through experiments. In this work, we investigate the properties of the covalently bonded chitosan-based ice-hydrogels interfacial layer by dielectric relaxation spectroscopy (DRS) techniques in the presence of avoided electrode polarization. The DRS data exhibit that the polymer-water interfacial layer has a strong dielectric signal response, which indicates that a large number of polar electric dipoles or polar molecules may be contained in the interfacial layer. The variable temperature dielectric relaxation behavior of a series of chitosan-base ice-hydrogels showed that the value of dielectric activation energy for different water contents is about 180 kJ/mol, which is much larger than that of the polymer and ice phases, suggesting a strong coupling of polar electric dipoles within the interfacial layer. This work demonstrates the important role of the polymer-water interface in covalently bonded hydrogels, which will provide assistance in the design and application of covalently bonded hydrogels. |
| first_indexed | 2024-03-09T11:52:57Z |
| format | Article |
| id | doaj.art-ec448378e65d4a0c966fb87b2af115b5 |
| institution | Directory Open Access Journal |
| issn | 2310-2861 |
| language | English |
| last_indexed | 2024-03-09T11:52:57Z |
| publishDate | 2022-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Gels |
| spelling | doaj.art-ec448378e65d4a0c966fb87b2af115b52023-11-30T23:13:32ZengMDPI AGGels2310-28612022-06-018740910.3390/gels8070409Significant Interfacial Dielectric Relaxation of Covalently Bonded Ice-HydrogelsYongqiang Li0Liufang Chen1Chuanfu Li2Lin Lin3Zhibo Yan4Junming Liu5Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, ChinaLaboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, ChinaLaboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, ChinaDepartment of Applied Physics, College of Science, Nanjing Forestry University, Nanjing 210037, ChinaLaboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, ChinaLaboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, ChinaHydrogels are composed of a three-dimensional network of cross-linked hydrophilic polymer chains and large amounts of water. The physicochemical properties of the polymer-water interface in hydrogels draw our attention. Due to the complex structure of hydrogel systems, it is still a challenge to investigate the interfacial layer properties of hydrogels through experiments. In this work, we investigate the properties of the covalently bonded chitosan-based ice-hydrogels interfacial layer by dielectric relaxation spectroscopy (DRS) techniques in the presence of avoided electrode polarization. The DRS data exhibit that the polymer-water interfacial layer has a strong dielectric signal response, which indicates that a large number of polar electric dipoles or polar molecules may be contained in the interfacial layer. The variable temperature dielectric relaxation behavior of a series of chitosan-base ice-hydrogels showed that the value of dielectric activation energy for different water contents is about 180 kJ/mol, which is much larger than that of the polymer and ice phases, suggesting a strong coupling of polar electric dipoles within the interfacial layer. This work demonstrates the important role of the polymer-water interface in covalently bonded hydrogels, which will provide assistance in the design and application of covalently bonded hydrogels.https://www.mdpi.com/2310-2861/8/7/409chitosanice-hydrogelsdielectric relaxation behavioractivation energyinterface |
| spellingShingle | Yongqiang Li Liufang Chen Chuanfu Li Lin Lin Zhibo Yan Junming Liu Significant Interfacial Dielectric Relaxation of Covalently Bonded Ice-Hydrogels Gels chitosan ice-hydrogels dielectric relaxation behavior activation energy interface |
| title | Significant Interfacial Dielectric Relaxation of Covalently Bonded Ice-Hydrogels |
| title_full | Significant Interfacial Dielectric Relaxation of Covalently Bonded Ice-Hydrogels |
| title_fullStr | Significant Interfacial Dielectric Relaxation of Covalently Bonded Ice-Hydrogels |
| title_full_unstemmed | Significant Interfacial Dielectric Relaxation of Covalently Bonded Ice-Hydrogels |
| title_short | Significant Interfacial Dielectric Relaxation of Covalently Bonded Ice-Hydrogels |
| title_sort | significant interfacial dielectric relaxation of covalently bonded ice hydrogels |
| topic | chitosan ice-hydrogels dielectric relaxation behavior activation energy interface |
| url | https://www.mdpi.com/2310-2861/8/7/409 |
| work_keys_str_mv | AT yongqiangli significantinterfacialdielectricrelaxationofcovalentlybondedicehydrogels AT liufangchen significantinterfacialdielectricrelaxationofcovalentlybondedicehydrogels AT chuanfuli significantinterfacialdielectricrelaxationofcovalentlybondedicehydrogels AT linlin significantinterfacialdielectricrelaxationofcovalentlybondedicehydrogels AT zhiboyan significantinterfacialdielectricrelaxationofcovalentlybondedicehydrogels AT junmingliu significantinterfacialdielectricrelaxationofcovalentlybondedicehydrogels |