水触发材料因其操作简单、驱动柔和、成本低廉、环境友好等诸多优点受到越来越多的关注。但是，大多数此类材料通常具有较长的反应时间，并且需要严格的保存条件，这限制了它们在实践中的适应性。本研究提出并证明了一种基于Al-NaOH复合共晶镓-铟（eGaIn）合金的新型水触发材料，该材料具有快速响应性和可变形性。一旦加入水，制成的材料将在短短几秒钟内随着气体的产生而升温40 ℃，这表明它具有用作热驱动器和气动驱动器的巨大潜力。此外，研究还测试了新材料的可重复使用性和降解能力。并据此设计了双层结构的智能绷带，其内部填充了Al-NaOH复合eGaIn，而BiInSn则作为外部支撑材料。实验显示，厚度为2 mm的片状结构经过冷却处理后能够支撑1.8 kg的重物，这比常用的玻璃纤维高分子绷带的承重能力要好得多。同时，研究还使用Al-NaOH复合eGaIn制作了水触发球形机器人的原型，该原型在特定的外部刺激下实现了滚动和弹跳行为。这些发现表明，当前材料在开发未来的可穿戴设备、软驱动器和软机器人方面具有潜在价值。

Water-triggered materials are receiving increasing attentions due to their diverse capabilities such as easy operation, soft actuation, low cost, environmental friendliness, and many more other advantages. However, most of such materials generally have a long reaction time and require strict preservation conditions, which limit their adaptability in practice. In this study, a novel water-triggered material based on Al-NaOH-composited eutectic gallium–indium alloys (eGaIn) was proposed and demonstrated, which is rather fast-responsive and deformable. Once water is applied, the material thus fabricated would achieve a temperature rise of 40 °C in just several seconds along with gas production, indicating its big potential to be used as a thermal and pneumatic actuator. Further, the new material's reusability and degradation ability were also tested. Following that, a double-layer-structure smart bandage was designed, whose bulk was filled with Al-NaOH-composited eGaIn while BiInSn served as outer supporting material. According to the experiments, a sheet structure with a thickness of 2 mm would support a weight of 1.8 kg after it was subjected to a cooling process, which is much better than the weight-bearing capability of fiberglass. In addition, a prototype of a water-triggered sphere robot was also fabricated using Al-NaOH-eGaIn, which realized rolling and bouncing behaviors under specific external stimulation. These findings indicate the potential value of the present material in developing future wearable devices, soft actuators, and soft robotics.