| 摘要: | 本研究開發出一種具備類彈性體特性的非常規顆粒型共熔凝膠（granular eutectogel），由將 Carbopol 微膠體分散於第四型深共熔溶劑（type IV deep eutectic solvent, DES）中所製得。此 DES 由氯化鈣六水合物（CaCl₂·6H₂O）與甘油組成並表現出牛頓流體行為及良好的離子導電性，且隨著 CaCl₂·6H₂O 含量增加，導電性提升而黏度降低。加入 Carbopol 後，原先會相分離的混合系統轉變為均一的凝膠，此轉變歸因於微膠體堆積與 Ca²⁺–羧酸鹽間螯合作用所促進之三維網絡結構的形成，並經由NMR與FTIR加以驗證。當 Carbopol 濃度高於 5 wt% 時，所得系統形成具剪切變稀與降伏應力之弱凝膠；當濃度超過 9 wt% 時，則形成具備明顯應力–應變響應之強凝膠。凝膠之機械性質隨 Carbopol 濃度增加而提升，導電性則相對下降。於 15 wt% Carbopol 的最佳配方中，力學性能與離子導電性達成良好平衡，並展現出優異彈性、小滯後損失、可回復且具抗疲勞能力與低應力衰減等彈性體特徵。作為可穿戴應變感測器時，該共熔凝膠展現出高靈敏度與良好重現性，能有效偵測如手指彎曲、書寫與吞嚥等動作。
;An unconventional granular eutectogel with elastomer-like behavior was developed by dispersing Carbopol microgels in a type IV deep eutectic solvent (DES) composed of CaCl₂·6H₂O and glycerol. The DESs showed Newtonian fluid behavior and good ionic conductivity, which increased with CaCl₂·6H₂O concentration, while viscosity decreased. Upon Carbopol addition, the system transitioned from a phase-separated mixture to a homogeneous gel, attributed to 3D network formation via microgel crowding and Ca²⁺–carboxylate chelation, confirmed by NMR and FTIR. At concentrations above 5 wt%, the resulting weak gel exhibited shear-thinning behavior with a yield stress, while concentrations above 9 wt% led to the formation of a strong gel, as characterized by its stress–strain response. Mechanical properties improved with increasing Carbopol concentration, though at the cost of reduced ionic conductivity. The optimized 15 wt% eutectogel achieved a balance between mechanical strength and ionic conductivity, exhibiting elastomeric characteristics such as excellent elasticity, minimal hysteresis, low stress decay, good recoverability, and favorable anti-fatigue performance. As a wearable strain sensor, it showed high sensitivity and reproducibility in detecting motions such as finger bending, handwriting, and swallowing. |
