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【太原理工大学|Small】自供能热电-机器学习协同材料识别戒指

  • 2026-02-06 05:56:55
【太原理工大学|Small】自供能热电-机器学习协同材料识别戒指

PART 01

文章信息
题目: Self-Powered Machine-Learning-Assisted Material Identification Enabled by a Thermogalvanic Dual-Network Hydrogel with a High Thermopower
作者: Yunsheng Li, Wenxu Wang, Xiaojing Cui, Ning Li, Xueliang Ma, Zhaosu Wang, Yuyou Nie, Zhiquan Huang, Hulin Zhang
单位: 太原理工大学电子信息与光学工程学院;山西师范大学物理与信息工程学院;太原科技大学机械工程学院
期刊: Small,2025年,第21卷,2405911
DOI: https://doi.org/10.1002/smll.202405911

PART 02

一句话亮点
构建了 高热电势(4.01 mV·K⁻¹)的热电化学双网络凝胶 ,结合机器学习,实现 无需外部供能的材料智能识别 ,总体识别准确率高达 97.2% 。

PART 03

研究背景与科学问题
人类可通过触觉中的“冷热感”快速判断材料属性,这一过程本质上源于 界面热传输差异 。现有柔性传感器多依赖外部供电(压阻、电容)或复杂结构(摩擦电、压电),在可穿戴与长期使用场景中存在局限。 热电化学(Thermogalvanic)凝胶可直接将微弱温差转化为电信号,具有 低成本、生物相容性好、结构柔软 等优势,但此前研究主要集中于温度感知, 鲜有用于材料识别 。
本工作的核心科学问题在于:
  • 如何提升热电化学凝胶的 热电势与稳定性 ?
  • 能否利用 自发产生的电信号 ,在无电池条件下实现材料识别?
  • 如何将 机器学习 引入触觉传感,实现高精度判别?

PART 04

技术原理与创新点
热电化学双网络凝胶(TG-DNH)设计
  • PAAm/明胶构成双网络骨架,兼具高强度与高柔性;
  • 引入 [Fe(CN)₆]³⁻/⁴⁻ 作为氧化还原对,实现温差驱动电化学反应。
关键电解质协同调控
  • LMS(锂镁硅酸盐) 扩大凝胶孔径,促进离子迁移;
  • Gdm⁺(胍离子) 重构溶剂化结构,显著放大氧化还原熵差,使热电势提升至 4.01 mV·K⁻¹ ;
  • Li⁺/Br⁻ 抑制水分挥发,提升长期稳定性。
自供能材料识别机理
接触不同材料 → 界面热传输不同 → 凝胶两端温差不同 → 输出特征化电压曲线。
机器学习判别
从电压曲线中提取 ΔVA、ΔVB、ΔVA/ΔVB、Vm 等特征,采用 随机森林(RF)算法 实现材料分类。 创新点在于 :首次将 热电化学自供能凝胶与机器学习 深度融合,用于主动式材料识别。

PART 05

实验验证与性能
热电性能 (图3)
  • 最大热电势: 4.01 mV·K⁻¹ (0.6 m Gdm⁺);
  • 最大输出功率: 51.5 μW (ΔT = 25 K);
  • 最大功率密度:≈ 0.99 W·m⁻² 。
机械性能 (图2)
  • 最大拉伸应变: 325% ;
  • 循环拉伸、压缩 50 次后性能基本无衰减。
材料识别性能 (图4)
  • 识别材料:铝、黄铜、不锈钢、陶瓷、亚克力、木材、泡沫;
  • 平均识别准确率: 97.2% ;
  • PCA 显示各材料类别具有良好可分性。

PART 06

学术贡献
  • 提出一种 高热电势热电化学双网络凝胶体系 ;
  • 实现了 完全自供能的材料识别传感模式 ;
  • 将 随机森林机器学习算法 引入触觉材料识别;
  • 为 人机交互与人工触觉智能 提供了新技术路线。

PART 07

局限性与未来方向
当前识别对象为宏观材料,尚未涉及表面粗糙度或微结构差异;
识别精度依赖训练数据规模,仍需进一步扩展数据集;
未来可拓展至 多模态触觉(温度+压力)融合 及可穿戴电子皮肤系统。

PART 08

总结
该研究通过材料设计、热电化学调控与机器学习算法协同,实现了 无需外部供电的智能材料识别 。这一工作不仅拓展了热电化学凝胶的应用边界,也为下一代 自供能触觉感知与人机交互系统 提供了重要启示。

PART 09

图文赏析
图1 :热电化学双网络凝胶结构及材料识别戒指(MIR)工作示意图。
图2 :凝胶孔结构调控、热电性能与力学性能对比。
图3 :热电化学工作机理、热电势、电流与输出功率特性。
图4 :不同材料接触产生的电压曲线、特征提取及机器学习识别结果。

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  1. CONNECT:[ UseTime:0.000788s ] mysql:host=127.0.0.1;port=3306;dbname=h460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001632s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000630s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000605s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001352s ]
  6. SELECT * FROM `set` [ RunTime:0.002586s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001475s ]
  8. SELECT * FROM `article` WHERE `id` = 470637 LIMIT 1 [ RunTime:0.000898s ]
  9. UPDATE `article` SET `lasttime` = 1770915136 WHERE `id` = 470637 [ RunTime:0.003842s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000873s ]
  11. SELECT * FROM `article` WHERE `id` < 470637 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.002033s ]
  12. SELECT * FROM `article` WHERE `id` > 470637 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001976s ]
  13. SELECT * FROM `article` WHERE `id` < 470637 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005072s ]
  14. SELECT * FROM `article` WHERE `id` < 470637 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001307s ]
  15. SELECT * FROM `article` WHERE `id` < 470637 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001476s ]
0.115848s