Enhanced multifunctional liquid metal-based hydrogels with vinyl silica nanoparticles for advanced strain sensing applications  

纳米二氧化硅增强液态金属多功能水凝胶及其在先进应变传感中的应用

作　　者：Bingyan Wang Wenxia Liu Zhaoping Song Guodong Li Dehai Yu Xiaona Liu Huili Wang Shaohua Ge 王炳艳;刘温霞;宋兆萍;李国栋;于得海;刘小娜;王慧丽;葛少华(State Key Laboratory of Biobased Materials and Green Papermaking,Qilu University of Technology,Shandong Academy of Science,Jinan 250353,China;Department of Periodontology,School and Hospital of Stomatology,Cheeloo College of Medicine,Shandong University&Shandong Key Laboratory of Oral Tissue Regeneration&Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration,Jinan 250012,China)

机构地区：[1]State Key Laboratory of Biobased Materials and Green Papermaking,Qilu University of Technology,Shandong Academy of Science,Jinan 250353,China [2]Department of Periodontology,School and Hospital of Stomatology,Cheeloo College of Medicine,Shandong University&Shandong Key Laboratory of Oral Tissue Regeneration&Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration,Jinan 250012,China

出　　处：《Science China Materials》2024年第10期3309-3320,共12页中国科学（材料科学）（英文版）

基　　金：funded by Key R&D Program of Shandong Province(2021ZDSYS18);National Natural Science Foundation of China(52172147);Natural Science Foundation of Shandong Province(ZR2021MC034,ZR2021MB035 and ZR2022MB095);QUTJBZ Program(2022JBZ01-05).

摘　　要：Conductive hydrogels have garnered considerable interest for their applications in wearable electronic skins,owing to their superior properties.Nevertheless,challenges persist,including low sensitivity,poor cyclic stability,and limited tolerance to extreme conditions.This study develops a novel liquid metal-based conductive hydrogel with a dual cross-linked polyacrylic acid(PAA)matrix,employing both“soft”coordination and“hard”covalent cross-linking mechanisms.This hybrid network is formulated using guar gum(GG)-stabilized gallium(Ga)droplets,which catalyze the copolymerization of vinyl-hybrid silica nanoparticles(VSNPs)and acrylic acid(AA).The resultant Ga3+ions interact with carboxyl groups in the PAA,forming soft coordination links that enhance the hydrogel’s rapid gelation.The incorporation of VSNPs significantly enhances the hydrogel’s elasticity,toughness,and low-temperature resilience without glycerol.Notably,its intrinsic moldability,adhesion,and self-healing properties are retained.Applied as a strain sensor,this hydrogel demonstrates a high gauge factor(GF)of 17.4,responsive time of 250 ms for both activation and recovery,an ultra-low detection limit of 0.1%,and excellent durability over 800 cycles at 100%strain.Short-term immersion in a glycerol solution(20 min)further augments its stretchability to 2688%and GF to 28.1 across a strain range of 1325%–1450%,broadening its operational ranges to 0–1450%at−18°C.Prolonged exposure(4 h)also improves water retention and high-temperature resistance,making this hydrogel a promising material for sustainable,high-performance wearable electronics.导电水凝胶由于其优异的性能,在可穿戴电子皮肤中的应用引起了广泛关注.然而,挑战依然存在,包括其灵敏度低、循环稳定性差、对极端条件的耐受性有限.本研究提出了一种新型基于液态金属的导电水凝胶,采用双交联聚丙烯酸(PAA)基质,结合了“软”配位和“硬”共价交联机制.这种混合交联网络是通过使用瓜尔胶(GG)稳定的镓(Ga)液滴来催化乙烯基二氧化硅纳米粒子(VSNPs)和丙烯酸(AA)的共聚反应而形成的.生成的Ga3+离子与PAA中的羧基相互作用,形成软配位交联,促进了水凝胶的快速凝胶化.VSNPs的加入显著提高了水凝胶的弹性、韧性和低温耐受性,而无需使用甘油.值得注意的是,其固有的可塑性、粘附性和自愈合性能得以保留.作为应变传感材料,该水凝胶具有17.4的高应变系数(GF)、250 ms的响应时间和恢复时间、0.1%的超低检测下限,以及在100%应变下800次循环的出色稳定性.在甘油溶液中短时间(20分钟)的浸泡进一步将其在−18°C下的延伸率提高到2688%,在1325%–1450%应变范围内的GF提高到28.1,工作范围扩大到0–1450%.延长浸泡时间(4小时)还可以改善其保水性和耐高温性能,使该水凝胶成为可持续、高性能可穿戴电子产品的理想传感材料.

关 键 词：vinyl silica nanoparticles liquid metals guar gum HYDROGEL strain sensor 

分 类 号：TQ427.26[化学工程] TP212[自动化与计算机技术—检测技术与自动化装置]