ACS Applied Polymer Materials
·
2024
·
IF 4.4
Saiyin Hou,Dong Lv,Yinghan Li,Zonglin Li,Mengmeng Liu,Xinhong Yu,Yanchun Han
Wearable dry electrodes are the foundation for the development of long-term, real-time biopotential monitoring devices. However, the physiological signals collected by common electrodes often accompany high noise and motion artifacts due to difficulties in conforming to skin deformations and poor contact between electrodes and skin. In contrast to them, PEDOT:PSS-based dry electrodes become a promising material with adjustable stretchability, conductivity, and adhesion properties to achieve high-quality signal delivery. Herein, we report a highly stretchable self-adhesive film prepared by the conductive polymers PEDOT:PSS, ethylene glycol (EG), poly(vinyl alcohol) (PVA), and d-sorbitol (SOR). In the blending system, SOR will disrupt the dense hydrogen bond interactions within PVA and PSS chains, while PEDOT:PSS/PVA physically cross-linked networks can dissipate strain energy, providing toughness to the films. In addition, the hydroxyl groups on the surface enable the film to be self-adhesive by forming hydrogen bonds with the N and O atoms of the skin stratum corneum. The blended electrode exhibits a conductivity of 200 S/cm and an elongation at break of 120%. Moreover, the electrical properties are still maintained after cyclic stretching (R/R0 ≈ 1.09). The maximum adhesion force of the film on glass and skin is 1.20 and 0.36 N/cm, respectively. The electrode has good biocompatibility, and its excellent stretchability and adhesiveness are conducive to comply with the skin deformation under different conditions. The contact impedance between dry electrodes and skin is only 77 kΩ cm2, which ensures the accurate monitoring of physiological signals including electromyogram (EMG) and electrocardiogram (ECG) during rest or exercise. The signal quality is significantly higher than that of standard Ag/AgCl electrodes. This highly stretchable self-adhesive dry electrode provides a feasible idea for the research of next-generation health monitoring devices.
研究领域:
生物医学工程
·
材料科学
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Peihe Wang,Hongyan Ding,Xiaofeng Li,Yangchengyi Liu,Yi Sun,Yujing Li,Guozhuang Xu,Shangda Chen,Xiufeng Wang
The slippage of moisture-sensitive materials from substrates during bending or stretching is a common issue that causes baseline drift and even failure of the flexible humidity sensors, which are essential components of wearable electronic devices. In this study, we report a stretchable, self-adhesive, and transparent humidity-sensing electronic patch comprising liquid metal particle electrodes with a stretchable serpentine structure and a humidity-sensing layer made of Ti3C2Tx MXene/carboxymethyl cellulose. This patch is constructed on a soft–hard integrated heterostructure substrate and demonstrates stable humidity-sensitive response performance at 100% tensile strain, along with autonomous adhesion to human skin. Additionally, it exhibits maximum response (1145.4%) at 90% relative humidity (RH), fast response and recovery time (1.4/5.9 s), elevated sensitivity (64.63%/% RH), and preserved humidity sensing under deformation, as well as easy scalability for multiplexed detection. We further illustrate the patch’s potential applications in healthcare and environmental monitoring through a non-contact security door control system and wind monitor system. Our proposed strain-isolation strategy can be extended to other rigid conductive materials and stretchable substrates, providing a feasible mechanism for producing stretchable electronic skin patches.
研究领域:
材料科学
·
柔性电子
·
生物医学工程
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产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Xiaoyu Shi,Kai Wang,Shishuai Gao,Daihui Zhang,Chenhuan Lai,Can Jin,Mi Li,Chunpeng Wang,Qiang Yong,Fuxiang Chu
As lignin is one of the most abundant renewable resources, utilization to fabricate functional hydrogels has gained increasing attention. However, the heterogeneous structure and the few available functional groups of lignin limited its applications. Herein, we presented a simple strategy to synthesize gallic acid (GA)-modified lignin as a key component to prepare conductive hydrogels. The addition of GA during the organic solvent pretreatment of poplar changed the structure of lignin and increased the total content of phenolic hydroxyl groups from 3.20 to 3.89 mmol/g (EOL-G30). Moreover, the enzymatic hydrolysis of pretreated poplar was enhanced from 49.1 to 55.2% (OP-G30) at a low enzyme loading of 5 FPU/g. When using GA-modified lignin to prepare hydrogels, the resulting hydrogel exhibited excellent self-adhesion to various substrates and demonstrated effective free radical scavenging capabilities. When incorporating sodium chloride (NaCl) as conductive ions, the hydrogels exhibit reliable strain-sensing capability. Moreover, they also displayed robust functionality in a low-temperature environment (−20 °C). This study has presented valuable insights to realize in situ modification of lignin and fabricate lignin-based functional materials, offering new perspectives for the biorefinery industry.
研究领域:
材料科学
·
生物化学
·
可再生资源工程
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产品关联
DOI
高影响因子
Cell Reports Physical Science
·
2021
·
IF 0
Jiahui Bai,Ran Wang,Xiaoming Wang,Shide Liu,Xinliang Wang,Jinming Ma,Zhihui Qin,Tifeng Jiao
Ion-conductive hydrogels combining high-performance mechanical properties, high conductivity, and self-adhesion are ideal for iontronic sensors, but their fabrication remains a challenge. Here, we present a transparent and highly ion-conductive hydrogel that integrates high strength, stretchability, and self-adhesiveness for iontronic sensors. The hydrogel is prepared by introducing biomineral calcium ions into a polyacrylamide-sodium carboxymethyl cellulose (PAM–CMC) crosslinked network. The presence of Ca 2+ not only induces the formation of dynamic crosslinked structure, endowing the hydrogel with notable mechanical properties (maximum strain of 1,480% and stress of 276 kPa), but also results in high ion conductivity (1.4 S·m −1 ). The hydrogel also exhibits strong adhesion with various substrates. Fabricated hydrogel-based sensors are highly sensitive to strain and stress changes with wide sensing ranges and can be used to detect complex human activities.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Lihui Zhao,Banxin Luo,Shishuai Gao,Yupeng Liu,Chenhuan Lai,Daihui Zhang,Wenxian Guan,Chunpeng Wang,Fuxiang Chu
Conductive hydrogels have recently gained impressive attention in flexible sensing. However, their low sensing limit and poor interface matching have raised great concern during the practical application. Therefore, incorporating excellent stretchability and adhesiveness into conductive hydrogel is highly desirable but still be a huge challenge. In this study, we synthesized composite hydrogels with desired properties by utilizing the synergistic role of hemicellulose (HC) and conductive two-dimensional material MXene. As a result, the synthesized hydrogels showed good self-adhesion (3.12 KPa on the skin), great stretchability (>1700 %), and satisfactory electrical conductivity. These multifunctional hydrogels operated as adaptable sensors, adeptly capturing the nuanced signals emanating from an array of human motions. They exhibited an expansive strain tolerance, swift reactivity, and an enhanced acuity in detecting even the slightest deformations (GF = 2.1). Our research provides new insights for creating stretchable, self-adhesive, and functional hydrogels for sensing applications.
研究领域:
材料科学
·
生物医学工程
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产品关联
DOI
PubMed
高影响因子
Biomaterials Advances
·
2024
·
IF 5.5
Junfang Chang,Weijun Wu,Ranran Wu,Zhiyong Guo,Sui Wang,Jie Mao
The flexible surface and chemical compatibility of hydrogels render them particularly appealing for research and development in antibacterial materials. However, designing tough hydrogels with multiple antibacterial mechanisms simultaneously remains a challenge. Inspired by the human skin, a hydrogel with bacterial antifouling, detection, and inactivation functions has been prepared using zwitterionic [2-(methylacrylyl) ethyl] dimethyl-(3-propyl sulfonate) ammonium hydroxide (SBMA) as the matrix and cadmium telluride quantum dots functionalised with cysteamine (CA-CdTe QDs) as the filler through micelle copolymerisation technology, achieving the integration of multiple antimicrobial mechanisms. The experimental analysis demonstrated that the SBMA/CA-CdTe/Micelle (SCM) hydrogel exhibited antibacterial activity against both Gram-negative bacteria ( Escherichia coli ) and Gram-positive bacteria ( Staphylococcus aureus ), proving its excellent broad-spectrum antibacterial properties. Introducing micelles imparts excellent hydrophilicity, stability, and mechanical properties to the SCM hydrogel. Moreover, the SCM hydrogels possess significant self-adhesive properties, enabling them to function as biomimetic skin that tightly adheres to target surfaces, protecting them from bacterial contamination. In addition, the SCM hydrogel biomimetic skin exhibits good electrical conductivity and biocompatibility, capable of converting the motion amplitude of human activity into stable electrical signals, suggesting potential for human motion sensing applications. Overall, the SCM hydrogel biomimetic skin designed in this work, as a multifunctional antibacterial platform, effectively reduces bacterial contamination and holds significant application potential in healthcare and life sciences.
研究领域:
材料科学
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生物医学工程
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微生物学
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产品关联
DOI
PubMed
高影响因子
POLYMER
·
2020
·
IF 4.231
Yi Wang,Guanghui Gao,Xiuyan Ren
Hydrogels flexible wearable sensors have gained widespread attention. However, there was a great challenge to prepare the flexible hydrogel sensor with rapid response, wide strain monitoring ranges, great sensitivity and self-adhesion. Therefore, the greatly sensitive and rapidly responsive strain sensor with wide monitoring range and self-adhesion was prepared by introducing sodium caseinate (SC) and reduced graphene oxide (rGO) into the polyacrylamide hydrogel due to ions and electrons provide two different ways of conducting electricity. Casein not only imparted excellent adhesion to the hydrogel, but also provided a good ionic conductive pathway. In addition, the introduction of rGO could offer an electronic pathway. Therefore, the obtained hydrogel exhibited excellent rapid response (190 ms), high sensitivity (Gauge factor, GF = 13.14) and wide strain monitoring range (0.1–1100%). As a result, SC/rGO/PAAm hydrogels could detect sensitive locomotor signals (for example speaking) and large-scale mankind movements for example knee bending). It was believed that the ion and electron conduction would provide a new mechanism to preparing greatly sensitive hydrogel strain sensor.
研究领域:
材料科学
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Rining Jin,Jiajun Xu,Lijie Duan,Guanghui Gao
Recently, flexible and wearable sensors assembled from conductive hydrogels have attracted widespread attention. However, it is still a great challenge to make hydrogels with sufficient mechanical properties, self-adhesiveness and strain sensitivity. Here, a strong, tough, and self-adhesive hydrogel is successfully fabricated by a one-pot method, which introducing chitosan and 2-acrylamido-2-methylpropane sulfonic acid into the polyacrylamide network. The hydrogels exhibited adhesion (the peel strength reaches 798 N/m), mechanical property (The breaking strength and strain can reach 111 kPa and 2839%) and electrical conductivity (conductivity up to 0.0848 S/cm), which are suitable for wearable epidermal sensors. Besides, the hydrogels also possessed transparency. Therefore, this work would provide a novel insight on the fabrication of multi-functional self-adhesive hydrogel sensors.
研究领域:
生物医学工程
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials
·
2022
·Vol. 15
·期 3
·991
·
IF 3.748
Jia-Kai Wu,Kai-Wen Zheng,Xing-Cheng Nie,Huang-Rong Ge,Qiong-Yan Wang,Jun-Ting Xu
A polydimethylsiloxane armed with epoxy, alkoxy and acrylate groups was synthesized from silanol terminated-PDMS and epoxy and acrylate groups functionalized silane coupling agents, and utilized as the adhesion promoter (AP) to prepare addition-cured liquid silicone rubber that exhibited self-adhesion ability (SA-LSR) with biocompatible thermoplastic polyurethanes (TPU) sheets. The structural characteristics of AP were characterized by Fourier transform infrared (FTIR) spectroscopy, which demonstrated the strong adhesion to polyester-based TPU sheets due to a sufficient amount of acrylate groups, epoxy groups and silanol groups obtained by the hydrolysis of alkoxy groups. In detail, the peel-off strength of SA-LSR and TPU joints reached up to 7.63 N mm−1after the optimization of adhesion promoter including type and content, and curing condition including time and temperature. The cohesive failure was achieved during the sample breakage process. Moreover, the SA-LSR showed a good storage stability under proper storage conditions. This design strategy provided the feasibility to combine the advantages of addition-cured liquid silicone rubber and plastics with low melting points, promoting the potential application range of those silicone-based materials.Keywords:self-adhesion;liquid silicone rubber;thermoplastic polyurethanes;cohesive failure
研究领域:
材料科学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 31
·10573-10583
·
IF 6.4
Enke Feng,Xiaoqin Li,Mengzhen Zhang,Xinxian Ma,Linan Cao,Zhiqiang Wu
Hydrogel-based sensors have drawn wide attention in the fields of medical monitoring, electronic skin, human–machine interfaces, and so forth. So far, although the research on hydrogel-based sensors has made great progress, there are still some problems hindering their further development, such as poor mechanical flexibility, inadequate anti-freezing capability, and weak self-adhesive and antibacterial properties. Herein, a multipurpose hydrogel (GG/PAAm/PA/LiCl) is facilely prepared by the thermally initiated radical polymerization method. The natural guar gum (GG) and chemically cross-linked polyacrylamide (PAAm) chain-based dual-network structures endow the hydrogel with excellent stretchability (2102%) and tensile strength (117 kPa). Meanwhile, the hydrogel exhibits extraordinary low-temperature tolerance due to the synergistic effects of phytic acid (PA) and lithium chloride (LiCl), which can basically maintain its original mechanical properties even after being stored at −50 °C for 15 days. Moreover, the introduction of natural biomolecule PA has also contributed to the superior self-adhesive property and prominent antibacterial activity. Furthermore, the as-prepared hydrogel can be served as a strain sensor with wide sensing range (5–500%) and remarkable signal stability (800 cycles at 200% strain), which displays attractive application prospects in rehabilitation training monitoring and information transmission. Owing to the outstanding anti-freezing capability, the hydrogel-based sensor is also capable of precisely sensing the bending movements of a prosthetic finger under an extreme weather condition of −50 °C. This work provides a new horizon to develop extraordinary freezing-tolerant hydrogels with multiple properties for future wearable electronics and artificial intelligence.
研究领域:
材料科学
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生物医学工程
·
电子皮肤技术
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 40
·13857-13864
·
IF 6.4
Wentang Wang,Xinyue Deng,Jinlong Lu,Chunhui Luo
Traditional conductive hydrogels are inevitably dehydrated by water evaporation when exposed to dry environments, which greatly retards their applications. Although great efforts have been devoted to reducing water evaporation, a combination of excellent stretchability, high sensitivity, non-freezing properties and self-adhesive capability has hardly been realized. Inspired by painting, an emulsion from poly butyl acrylate was prepared and coated onto the surface of a micellar cross-linked polyacrylamide (PAM) hydrogel to prepare a hydrophobic coated PAM gel (C-PAM). The presence of a hydrophobic layer endowed it with excellent anti-drying capability (84 ± 0.45% weight retention after 7 days under ambient conditions), while micelle-like aggregates imparted excellent extensibility (elongation at break = 5200%). The introduction of poly butyl acrylate also empowered self-adhesive properties. The C-PAM hydrogel could adhere to rubber, cardboard, metal, wood, glass and plastic with strengths of 38.59 ± 8.29, 47.42 ± 8.06, 15.53 ± 2.61, 46.54 ± 7.92, 14.71 ± 2.17 and 29.33 ± 3.11 kPa, respectively. The adoption of sodium chloride (NaCl) imparted high sensitivity (GF = 6.41) and anti-freezing properties (−20 °C). Bearing multi-functions, the reported strategy is expected to significantly broaden the applications of conductive hydrogels.
研究领域:
材料科学
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生物医学工程
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产品关联
DOI
高影响因子
POLYMER
·
2022
·
IF 4.432
Jinyang Liu,Yang Gao,Guanghui Gao,Lijie Duan
As a promising functional material , hydrogels have received extensive attention in the field of flexible wearable sensors . However, it remains a huge challenge to explore a multifunctional hydrogel sensor combining excellent self-adhesion, strain sensitivity, mechanical attributes, and self-healable ability. Here, different from the traditional dissolution method with strong acidic media, chitosan (CS) was directly dissolved in 2-acrylamide-2-methylpropane sulfonic acid (AMPS) and ferric solution, and then combining acrylic acid (AA) to construct a multifunctional hydrogel based on the synergy of metal complexation and chemical cross-linking. The hydrogels exhibited excellent adhesion both in air and underwater, proper mechanical attributes and self-healable properties. Moreover, the hydrogel with good electrical conductivity possessed strain sensitivity, which could serve as strain sensors to detect body movements. Therefore, this work could broaden sight into the preparation of multifunctional hydrogel strain sensors.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
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