1成果简介

　　听力障碍者通常难以从技术进步中受益，他们发现自己被局限在孤立的手语交流圈中。为了解决这个问题，本文，吉林师范大学Tongshun Wu、吉林大学邹陆 副教授在《Polymer Composites》期刊发表名为“Synergistic double-doped elastic composites for durable, ultra-flexible sign language translation sensors”的论文，研究开发了一种可穿戴设备，它能将手语翻译成语音，促进聋人与更广泛的社区之间的交流。
　　研究采用了一种特殊的处理和分散方法，在苯乙烯-b-（乙烯-共丁烯）-b-苯乙烯（SEBS）中均匀地双层掺杂 Super-P（SP）和石墨烯，通过它们的协同效应构建了一个类似于神经细胞和神经胶质细胞的三维导电网络。这种超柔性弹性应力传感器具有高灵敏度和高响应性，并且由于均匀掺杂而具有出色的周期稳定性。在 60% 应变的拉伸释放循环超过2000次后，它没有显示出明显的信号偏移。得益于这种材料的卓越性能，该设备能在不到一秒的时间内识别并再现动作，同时将手语输入转换成相应的语音。原型的设计考虑到了成本效益，采用了经济实惠的材料、电子元件和制造工艺，适合大规模生产。
　　2图文导读 

　　图1、SEM image of graphene sheets prepared by liquid phase intercalation exfoliation (A); image of commercial SP particles (B); the surface of the elastic composite conductive film formed after solvent evaporation (C); surface of the film treated by plate vulcanization (D); image of locally enlarged film, the red arrows point to graphene (E); cross-section of the composite membrane (F, G); images of membrane being stretched, the blue arrow is the direction of stretch (H, I).

　　图2、Mechanical properties of composite elastic membranes. Stress–strain curves of membranes with different doping ratios, speed of 20 mm/ min (A); loading –unloading curves at different strains for SEBS only (B) and sample ES1G (C); photographs of the prepared composite membranes in different tensile states (D–I).

　　图3、Electrical properties of sample materials. the surface resistance of each membrane sample, tested three times with a four-probe at different points for each film (A); current –elongation curve (B, E), the inserting is the current curve of 50% cycle stretching –releasing of ES2G; Schematic structure of graphene with SP to build a conductive network (C); curves of pressure –current (D); schematic diagram of the principle that deformation affects the change of current (F, G).

　　图4、Current of ES1G film during stretch–release cycles at 60% under different strain speeds (A); I − I0/I0 under stretch–release cycles at different strain speeds with 2 mm/s (B) and 5 mm/s (C) strain speed; I–V curves of ES1G film under different strains (D); more than 2000 stretch–release cycles at 60% and 3 mm/s; strain sensor on the index finger current change detection with different flexion angles and speeds.

　　图5、(A) Circuit diagram representing the signal flow in a real-time sign language translation system from the collected analog electrical signal to the digital signal used for sign language translation; Photographs of the prototype of a wearable sign-to-speech translation device that drives the application's visual interface to display the same action and convert it into the corresponding speech on the computer (B, D, F, H, J), with the current signal corresponding to the sign language on the right as the recognition patterns (C, E, G, I, K).
　　3小结
　　本研究介绍了一种开发可穿戴手语翻译器的综合方法，涵盖了从新型材料合成到原型设备实现的整个过程。在 SEBS 基体中的石墨烯和 Super-P 复合材料表现出卓越的电气和机械性能，包括对拉伸和压缩应变的高灵敏度、超过 2000 次循环的出色耐用性以及宽响应范围。这些材料特性与简单、可扩展的制造工艺相结合，为制造具有成本效益和高响应性的传感器阵列奠定了基础。原型设备集成了 14 个传感器，能成功捕捉复杂的手势并将其转化为语音，响应时间不到一秒。该系统代表了辅助技术的进步，有可能缩小聋人与普通人之间的交流差距。此外，将这一技术与智能手机应用程序整合并探索无线连接，可以进一步提高其实用性和可及性。随着这一领域的不断进步，材料科学家、软件工程师和辅助技术专家之间的合作对于完善和扩展此类设备的功能至关重要，最终将为建设一个更具包容性的社会做出贡献。
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