Tough, Antifreezing, and Conductive Hydrogel Based on Gelatin and Oxidized Dextran,Advanced Materials Technologies

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Tough, Antifreezing, and Conductive Hydrogel Based on Gelatin and Oxidized Dextran
Advanced Materials Technologies ( IF 6.4 ) Pub Date : 2022-02-11 , DOI: 10.1002/admt.202101382
Lilong Cao ₁ , Zhijie Zhao ₁ , Xueying Wang ₂ , Xueli Huang ₂ , Junjie Li _{3,

4} , Yuping Wei _{1,

4}

Affiliation

Forming natural polymers-based hydrogels with enhanced mechanical strength, outstanding antifreezing property and superior conductivity is still a challenge. Here, gelatin/oxidized dextran hydrogel is fabricated and it shows enhanced mechanical performance, antifreeze tolerance, and conductivity due to the synergistic interaction of ammonium sulfate and betaine. The resulting gelatin/oxidized dextran/(NH₄)₂SO₄/betaine hydrogel exhibits high stretchability (570%), tough tensile (2.49 MPa) and compressive (46.41 MPa) fracture strength, favorable tensile (6.05 MJ m⁻³) and compressive (3.08 MJ m⁻³) toughness, antifreezing property (−30 °C) and high conductivity (2.86 S m⁻¹). Based on the above characteristics, the hydrogel is applied for strain sensor to monitor the joints motion of human body such as finger, wrist, elbow, knee, neck, and throat. The hydrogel can maintain good mechanical performance and stable sensing signal from 25 to −30 °C. Therefore, the designed hydrogel based on natural polymers shows a huge potential for tissue engineering and biosensing under the mild or extreme environment.

中文翻译：

基于明胶和氧化葡聚糖的坚韧、防冻和导电水凝胶

形成具有增强的机械强度、出色的防冻性能和出色的导电性的基于天然聚合物的水凝胶仍然是一个挑战。在这里，制备了明胶/氧化葡聚糖水凝胶，由于硫酸铵和甜菜碱的协同相互作用，它显示出增强的机械性能、抗冻耐受性和导电性。所得明胶/氧化葡聚糖/(NH ₄ ) ₂ SO ₄ /甜菜碱水凝胶表现出高拉伸性（570%）、韧性拉伸（2.49 MPa）和压缩（46.41 MPa）断裂强度、良好的拉伸（6.05 MJ m ^-3）和抗压 (3.08 MJ m ^-3 ) 韧性、防冻性能 (-30 °C) 和高导电性 (2.86 S m ^-1）。基于以上特点，水凝胶应用于应变传感器，监测人体手指、腕、肘、膝、颈、喉等关节运动。水凝胶可以在 25 至 -30 °C 范围内保持良好的机械性能和稳定的传感信号。因此，基于天然聚合物设计的水凝胶在温和或极端环境下显示出巨大的组织工程和生物传感潜力。

更新日期：2022-02-11

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