Inspired by biological camouflage strategy according to the surrounding environment, a facile method to fabricate state‐switchable cellulose hydrogels (fluid, brittle, and rigid hydrogel) driven by Ca²⁺/Zn²⁺ ion exchange is reported. The high content of Ca²⁺ ions leads to the formation of a rigid hydrogel (Gel‐H‐Ca²⁺) with a great compressive strength (≈2.2 MPa) through coordination cross‐linking network, while Zn²⁺ ions give the cellulose (Sol‐L‐Zn²⁺) a fluid state by eliminating the cellulose intermolecular connections, making it possible to obtain injectable and healable hydrogels. Gel‐H‐Ca²⁺ is highly oriented and anisotropic, and such flexible hydrogel can effectively monitor slight bending and pressure changes of fingers. This cellulose hydrogel will be a promising candidate for bionic and multifunctional sensors.

中文翻译：

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可逆离子交换的纤维素水凝胶作为柔性压力传感器

受生物伪装策略根据周围环境的启发，据报道，有一种简便的方法来制造由Ca ²⁺ / Zn ²⁺离子交换驱动的状态可转换的纤维素水凝胶（流体，脆性和刚性水凝胶）。Ca ²⁺离子的含量高，通过配位交联网络导致形成具有高抗压强度（≈2.2MPa）的刚性水凝胶（Gel-H-Ca ²⁺），而Zn ²⁺离子使纤维素（Sol-L-Zn ²⁺）通过消除纤维素分子间的连接而处于流体状态，从而有可能获得可注射且可治愈的水凝胶。Gel‐H‐Ca ²⁺具有高度的定向性和各向异性，这种柔性水凝胶可以有效地监测手指的轻微弯曲和压力变化。这种纤维素水凝胶将成为仿生和多功能传感器的有前途的候选者。