Multifunctional gradient hydrogel with ultrafast thermo-responsive actuation and ultrahigh conductivity,Journal of Materials Chemistry A

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Multifunctional gradient hydrogel with ultrafast thermo-responsive actuation and ultrahigh conductivity
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2022-09-13 , DOI: 10.1039/d2ta05770k
He Liu ₁ , Xueying Jia ₂ , Ruonan Liu ₁ , Kun Chen ₁ , Zhaoyang Wang ₁ , Tong Lyu ₁ , Xiaoyu Cui ₁ , Yue Zhao ₁ , Ye Tian _{1,

3}

Affiliation

Bioinspired hydrogels with both outstanding actuation and conductivity still remain challenging. Here, we use a simple and universal method to fabricate an octopus-tentacle inspired multifunctional gradient hydrogel with both ultrafast thermo-responsive actuation and ultrahigh conductivity. The gradient network structure, formed by rapid precipitation of nanosilver flakes producing hydrophilic differences between two sides within the hydrogel, endows the hydrogel with ultrafast actuation (52.3° s⁻¹). In addition, nanosilver flakes also provide the hydrogel with ultrahigh conductivity (>1231 S m⁻¹) due to the formation of conductive pathways by rapid hydrogel volume shrinkage under thermal stimulation. Meanwhile, the hydrogel exhibits high sensitivity (gauge factor 14.66 within a wide strain range of 500%) and strong antibacterial properties. With these great properties, we firstly assemble the hydrogel as soft actuators (gripper and jack), where the gripper can firmly grasp and release the target object within only 8 s and 1 s, respectively. Secondly, we use the hydrogel as a wearable electronic device that enables precise detection of human motion and physiological signals. Finally, we realize smart circuit switches by combining great actuation and conductivity. Our multifunctional hydrogel offers promising opportunities for intelligent biomaterials, soft robotics and flexible sensors.

中文翻译：

具有超快热响应驱动和超高电导率的多功能梯度水凝胶

具有出色驱动和导电性的仿生水凝胶仍然具有挑战性。在这里，我们使用一种简单而通用的方法来制造具有超快热响应驱动和超高电导率的章鱼触手启发的多功能梯度水凝胶。通过纳米银薄片的快速沉淀形成的梯度网络结构在水凝胶内的两侧之间产生亲水性差异，赋予水凝胶超快驱动（52.3° s ^-1）。此外，纳米银薄片还为水凝胶提供了超高电导率（>1231 S m ^-1）由于在热刺激下通过快速水凝胶体积收缩形成导电通路。同时，该水凝胶具有高灵敏度（在 500% 的宽应变范围内的测量因子为 14.66）和强大的抗菌性能。凭借这些出色的特性，我们首先将水凝胶组装为软致动器（夹具和千斤顶），其中夹具可以分别在 8 秒和 1 秒内牢牢抓住和释放目标物体。其次，我们将水凝胶用作可穿戴电子设备，可以精确检测人体运动和生理信号。最后，我们通过结合出色的驱动和导电性来实现智能电路开关。我们的多功能水凝胶为智能生物材料、软机器人和柔性传感器提供了有前景的机会。

更新日期：2022-09-13

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