Strengthening and stiffening in swollen polyampholyte hydrogels

Zhou, Ju; Huang, Yiwan; Qian, Sanyu; Zeng, Peipei; Long, Shijun; Li, Xuefeng

doi:10.1016/j.matlet.2022.132582

Cited by 7 publications

(8 citation statements)

References 11 publications

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“…NaSS, DMAEA-Q, MBAA, and α-keto was prepared according to the literatures. [17,37,60] The total monomer concentration (C m ) and the molar fraction of anionic monomer were 2.3 m and 0.487, respectively, and the molar fractions of both cross-linker and initiator were 0.10 mol.% (relative to C m ). The pre-gel solution was formed under magnetic stirring at 65 °C for 10 min.…”

Section: Discussionmentioning

confidence: 99%

“…PA‐Zr 4+ hydrogels were prepared via a secondary equilibrium approach reported in the recent study. [ 17,60 ] Typically, the WEQ‐PA hydrogel was firstly soaked in 200 mL ZrOCl 2 solutions at room temperature until a swelling equilibrium was achieved. The ZrOCl 2 concentration (

{C_{{\rm{ZrOC}}{{\rm{l}}_{\rm{2}}}}}

) of the soaking solutions ranged from 0 to 1.0 m .…”

Section: Methodsmentioning

confidence: 99%

“…Preparation of PA-Zr 4+ Hydrogels: PA-Zr 4+ hydrogels were prepared via a secondary equilibrium approach reported in the recent study. [17,60] Typically, the WEQ-PA hydrogel was firstly soaked in 200 mL ZrOCl 2 solutions at room temperature until a swelling equilibrium was achieved. The ZrOCl 2 concentration (C ZrOCl 2 ) of the soaking solutions ranged from 0 to 1.0 m. As-prepared PA-Zr 4+ gels were formed by varying the dialysis time from 0 to 195 d and denoted as ASP-PA-Zr 4+ -x-y gels, where x and y represent C ZrOCl 2 (m) and dialysis time (d) in ZrOCl 2 solutions, respectively.…”

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Achieving Swollen yet Strengthened Hydrogels by Reorganizing Multiphase Network Structure

Huang

Qian

Zhou

et al. 2023

Adv Funct Materials

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Many living tissues, such as muscle, become mechanically stronger with growth. Yet, synthetic hydrogels usually exhibit an opposite size‐mechanical property relation, that is, swelling‐weakening behavior. Herein, a series of swollen yet strengthened polyampholyte (PA) hydrogels are developed via a simple metal‐ion solution soaking strategy. In this strategy, a dynamic PA hydrogel (with ionic bonds) is dialyzed in ZrOCl2 solutions (Step‐I) and deionized water (Step‐II) successively to obtain equilibrated hydrogels. Due to the specific Zr4+ ions and PA network structure, Step‐I takes several months with sample size and mechanical performance increasing continuously, while Step‐II only needs several days. Through this strategy, the resultant hydrogel networks are reorganized and eventually constructed by ionic and metalligand bonds, enabling the swelling yet strengthening behavior. A systematic study confirms that dialysis time in Step‐I and corresponding ZrOCl2 concentration can significantly affect the multiphase microstructures of the hydrogels, resulting in different mechanical enhancements. The optimized hydrogel possesses 39.2 MPa of Young's modulus and 3.7 MPa of tensile strength, which are 302 and 5.5 times these of the original PA gel, respectively. Despite distinct swelling, these hydrogels still mechanically surpass many existing high‐performance hydrogels. This study opens a novel pathway for fabricating swollen yet strengthened hydrogels.

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Section: Discussionmentioning

confidence: 99%

{C_{{\rm{ZrOC}}{{\rm{l}}_{\rm{2}}}}}

) of the soaking solutions ranged from 0 to 1.0 m .…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Achieving Swollen yet Strengthened Hydrogels by Reorganizing Multiphase Network Structure

Huang

Qian

Zhou

et al. 2023

Adv Funct Materials

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“…Previous studies have demonstrated the formation of some ionic bonds in the ASP-PA gel. 22 The aforementioned finding indicates that the dialysis in FeCl 3 solution resulted in the destruction of most ionic bonds, including those pre-formed in the ASP-PA gel, which subsequently led to a reduction in the interactions between polymer chains in the ASP-PA-Fe 3+ gel. The decrease in such interactions might have facilitated the reorganization and optimization of the PA network, resulting in the synergistically enhanced DRY-PA-Fe 3+ gel by ionic and metal−ligand bonds.…”

Section: Dry-pa-fe 3+mentioning

confidence: 94%

“…The synthesis of P(NaSS- co -DMAEA-Q) hydrogel was accomplished through a free radical copolymerization process, which is depicted in Figure S1. The pre-gel solution was formulated with NaSS, DMAEA-Q, MBAA, and α-keto according to the literature. , The total monomer concentration ( C m ) was set to 2.3 mol L –1 , and the molar fraction of the anionic monomer was 0.50, while both crosslinker and initiator had molar fractions of 0.10% (relative to C m ). Under magnetic stirring at 65 °C for 10 min, the pre-gel solution was formed.…”

Section: Methodsmentioning

confidence: 99%

Tough Ion-Conductive Hydrogel with Anti-Dehydration as a Stretchable Strain Sensor for Gesture Recognition

Jiang,

Ou,

Zhang

et al. 2023

ACS Appl. Polym. Mater.

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Stretchable hydrogel-based strain sensors have attracted considerable interest for their potential applications in human motion detection, physiological monitoring, and electronic skin. Yet, the durability of hydrogel sensors is seriously hindered due to inevitable water evaporation and weak mechanical properties. Herein, we report modified polyampholyte (PA) hydrogels that show anti-dehydration and ion conductivity via a simple metal-ion solution soaking and drying-out strategy. In this strategy, an as-prepared PA hydrogel (with ionic bonds) is dialyzed in FeCl 3 solutions (Step-I) and annealed at 65 °C for (Step-II) successively to reconstruct its network with numerous synergistic ionic and metal−ligand bonds. The resulting hydrogels demonstrate superior mechanical properties, ultralong anti-dehydration life span (>30 days), and high ion conductivity (≈15 S m −1 ). To understand the reinforcement mechanisms, we evaluate the viscoelastic and elastic contributions to the mechanical properties of the hydrogels via a viscoelastic model. This gel can be further engineered to a stretchable strain sensor to recognize hand gestures with a well-trained machine learning algorithm. The proposed strategy is straightforward and effective for achieving anti-dehydration and highly ion-conductive tough hydrogels.

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Robust, self-lubricating and injectable dECM-loaded hydrogels based on rapid photo-crosslinking for articular cartilage regeneration

Liu,

Zhang,

Kang

et al. 2024

Applied Materials Today

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Strengthening and stiffening in swollen polyampholyte hydrogels

Cited by 7 publications

References 11 publications

Achieving Swollen yet Strengthened Hydrogels by Reorganizing Multiphase Network Structure

Achieving Swollen yet Strengthened Hydrogels by Reorganizing Multiphase Network Structure

Tough Ion-Conductive Hydrogel with Anti-Dehydration as a Stretchable Strain Sensor for Gesture Recognition

Robust, self-lubricating and injectable dECM-loaded hydrogels based on rapid photo-crosslinking for articular cartilage regeneration

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