Chemosensors
·
2022
·Vol. 10
·期 11
·464
·
IF 4.229
Zhaonan Hou,Zhiyan Ma,Xin Guan,Hongran Zhao,Sen Liu,Teng Fei,Tong Zhang
Humidity sensors with high sensitivity and fast response characteristics are of great interest for researchers. In this work, capacitive humidity sensors were fabricated using ionic liquid/cellulose nanofibers (CNFs) as the composited sensing film. The porous CNFs are beneficial for preparing sensing films via a solution process, and the ionic liquid could be uniformly dispersed in the films. The humidity-sensing performance of the as-prepared sensors was investigated. The optimized sensor showed a high response (27.95 pF/% RH) in a wide humidity range (11–95% RH) and a fast response speed in the adsorption process (the recovery time was only ~1 s). The high response of the sensors was attributed to the polarization at the interface between the electrolyte and the metal electrode, while the fast recovery was due to the rapid desorption of water molecules on the sensing films. Finally, the application of the obtained sensors in human breath monitoring was explored.Keywords:humidity sensor;high sensitivity;fast recovery;breath monitoring
研究领域:
材料科学
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传感器技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
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2018
·Vol. 56
·期 21
·1469-1474
·
IF 2.499
Shuangfei Xiang,Ting Li,Weifu Dong,Qinghua Lu
In this article, we report a synergistic strategy to develop dual physically cross-linked tough hydrogels via one-pot bulk copolymerization of N-vinyl-2-pyrrolidone, acrylic acid, and stearyl methylacrylate (SMA) without any adscititious surfactant. Due to synergic effects of hydrogen bonding and hydrophobic association, the resulted dual physically cross-linked hydrogels (DP Gel) with ultra-wide range adjustable Young's modulus (0.08–45.6 MPa), tensile stress (0.7–6.9 MPa), and toughness (3.3–23.1 MJ m −3 ). Stretching to 300%, DP Gel exhibited fast recoverability that remained ~95% of initial dissipated energy after resting in 60 °C for 3 min. Finally, scanning electron microscopy revealed that the microstructure of hydrogel changed from phase separation structure to micro phase separation as SMA added, which accounted for excellent performance of DP Gel. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2018 , 56 , 1469–1474
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Soft Matter
·
2017
·Vol. 13
·期 7
·1357-1363
·
IF 3.889
Jiliang Hou,Xiuyan Ren,Shuang Guan,Lijie Duan,Guang Hui Gao,Yu Kuai,Huixuan Zhang
In this study, a novel strategy was designed to prepare rapidly recoverable, anti-fatigue, super-tough double-network hydrogels by introducing macromolecular microspheres (MMs) as cross-linking centers for hydrophobic associations. MMs were prepared via emulsion polymerization using butyl acrylate (BA) as a main component and dicyclopentyl acrylate (DCPA) as a cross-linker. Then, a double-network (DN) hydrogel was prepared using gelatin as the first network and a copolymer of acrylamide and hexadecyl methacrylate stabilized by MMs as the second network. As a result, the DN hydrogels that were toughened by MMs exhibited an excellent fracture strength of 1.48 MPa and a fracture strain of 2100%. Moreover, the hydrogels exhibited rapid recoverability and fatigue resistance. Therefore, the strategy would open up a novel avenue for the toughening of DN hydrogels for biomedical applications.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Liming Qin,Ying Chu,Xin Zhou,Qinmin Pan
Self-healability is a crucial feature for developing artificial superhydrophobic surfaces. Although self-healing of microscopic defects has been reported, the restoration of severely damaged superhydrophobic surfaces remains a technological challenge. Here, we report a robust superhydrophobic surface possessing ultrafast recoverability after catastrophic damage. The surface is fabricated via integrating its hierarchical texture comprised of Super P (a conductive carbon black) and TiO2 nanoparticles into a poly(dimethylsiloxane) network cross-linked by dynamic pyrogallol-Fe coordination. In the presence of an electrical trigger, the surface restores its macroscopic configuration, hierarchical texture, mechanical properties, and wettability within 1 min after being cut or plasma etching. The restoration is attributed to the reconstruction of the multiscale structures through dynamic coordination. Application of the self-healable surface is demonstrated by a fast de-icing process. The present investigation offers a novel insight into the durability and reliability of artificial superhydrophobic surfaces against catastrophic damage, which has potential application in the fields including self-cleaning, anti-icing, advanced electronics, and so on.
研究领域:
材料科学
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表面工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 33
·17325-17334
·
IF 8.867
Guomin Ding,Weicheng Jiao,Rongguo Wang,Yue Niu,Lifeng Hao,Fan Yang,Wenbo Liu
Recently, multifunctional superhydrophobic surfaces with high adhesion behavior have attracted much attention for microdroplet transportation. Here, we report for the first time a multifunctional, rose-petal-like, superhydrophobic graphene film via the self-assembly of graphene oxide (GO) that has self-sensing and fast recovery properties for microdroplet transportation. This superhydrophobic film does not require a hydrophobic coating and has a micro-nanoscale hierarchical structure. Because of its structure, our biomimetic, superhydrophobic film has high adhesive force to water droplets and can be used as a medium for microdroplet transportation. In addition, because the film was constructed using pure graphene, it has excellent conductivity properties and an immediate response system is also built to detect potential damage. Moreover, owing to the gas sensing properties of graphene, our film has self-sensing properties where the resistance of the film increases gradually when water droplets are close to it. What's more, the film has an ultra-fast Joule heating rate of 18 °C s−1. Based on these properties, the recovery time for the resistance of the film can be reduced by 57.7% for water droplet transportation. Therefore, our multifunctional, superhydrophobic graphene film can be used for smart microdroplet manipulation in the future.
研究领域:
材料科学
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生物仿生学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2017
·
IF 3.582
Pengcheng Li,Zhihong Xiong,Sheng Zhu,Mengye Wang,Yongming Hu,Haoshuang Gu,Yu Wang,Wanping Chen
Pt Nb 2 O 5 porous composite ceramics have been prepared from Pt and Nb 2 O 5 particles through convenient pressing and sintering. Extraordinary room-temperature hydrogen sensing capabilities have been revealed for Pt Nb 2 O 5 composite ceramics of 1 wt% Pt, including a sensitivity over 165, response time and recovery time of 7s and 39s, respectively, for 1% H 2 in air. For 0.25% and lower concentrations of H 2 in air, ultrafast recoveries, such as a recovery time of 8s for 0.04% H 2 in air, are observed, which are singular for room-temperature hydrogen sensing. We further found a strong correlation between the resistance of Pt Nb 2 O 5 composite ceramics and hydrogen concentration in ambient oxygen-free atmospheres, and a negative temperature dependence of hydrogen sensitivity, from which a hydrogen sensing mechanism rooted in hydrogen chemisorption on Nb 2 O 5 has been established, while the ultrafast recoveries are explained in terms of a highly mobile and reactive state of chemisorbed hydrogen ions on Nb 2 O 5 .
研究领域:
材料科学
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传感器技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Hao Gu,Yiqing Zeng,Qin Zhong,Yunfei Bu
Rapid and full recovery is the major challenge for the commercialization and further growth of textile-based wearable supercapacitors. Herein, reversibly stretchable and rapidly reboundable textile supercapacitors (TSCs) are developed via the utilization of NiCu2Se3/Cu–Ni alloy-plated cotton cloth (CNAPCC) textile as the cathode and Fe2CuSe3/CNAPCC textile as the anode. Both NiCu2Se3/CNAPCC and Fe2CuSe3/CNAPCC are obtained by a simple in situ oxidation reaction, followed by an ion exchange strategy. Meanwhile, a stable double-network (DN) structure is constructed, covering the knitted cotton cloth (KCC) and Cu–Ni alloy-plated layer (CNAPL). The DN textile structure significantly endows the NiCu2Se3/CNAPCC stretchable electrode with superior mechanical properties, exhibiting high elongation at a break of 470% with a stress of 7.19 MPa and full recovery after 100% strain with almost no residual deformation left after merely 0.2 s. Moreover, the assembled TSC provides a large energy density of 82 Wh kg–1 at a power density of 750 W kg–1. Besides, 50,000 charge/discharge cycle tests under static stretching are performed. The supercapacitor exhibits rapid recovery and excellent cycling stability of 92.2% capacitance retention under different strains (from 0 to 200%).
研究领域:
材料科学
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能源技术
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纺织工程
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Zhanbo Wang,Depeng Gong,Wanyu Chen,Chaocan Zhang
In fields ranging from human motion detection to physiological signal monitoring, medical diagnostics, smart clothing, and human–machine interaction, the demand for flexible strain sensors is continuously growing. This demand has spurred active exploration into high-performance flexible strain sensors. Most strain sensors developed through various technologies are based on elastomers with a single elastic modulus serving as the flexible substrate, which determines the recovery time for different strain behaviors. Although such strain sensors are ubiquitous, it has been shown that a single modulus may affect motion or recovery time, thus lacking a balance in the elastic modulus of the flexible substrate. In this study, we prepared a strain sensor with a gradient change in elastic modulus. The sensor features a three-layer flexible substrate with different modulus and a conductive network based on high aspect ratio electroless silver-plated glass fibers. The strain sensor exhibits excellent response performance, including an outstanding detection range (0–200 %), high sensitivity (Gauge Factor, GF max = 7760), rapid response time (140 ms), and exceptional durability (10,000 cycles). The unique gradient change in elastic modulus allows the strain sensor to have low residual strain. During the stretch-release process, the sensor can return to near its initial state, exhibiting low hysteresis. This strain sensor can monitor human movements in real-time, such as finger bending, joint flexing, walking, and running, making it a promising candidate for applications in human motion monitoring and smart wearables.
研究领域:
材料科学
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生物医学工程
·
柔性电子
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Yun Tan,Di Wang,Huaxiu Xu,Yang Yang,Xiong-Lei Wang,Fei Tian,Pingping Xu,Wenli An,Xu Zhao,Shimei Xu
Fast recovery in a nonaqueous environment is a big challenge for hydrogel actuators. In this work, a temperature-responsive hydrogel actuator with outstandingly rapid recovery in air was reported. The hydrogel with bionic large-ranged gradient structure was fabricated by copolymerization of hydrophilic monomer hydroxyethyl acrylate (HEA) and N-isopropylacrylamide in the dispersion of Laponite utilizing a facile electrophoretic method. The deformation degree and time can be regulated by varying the concentration of HEA to change the lower critical solution temperature (LCST) and swelling of the hydrogel. A dynamic equilibrium between the water into and out of the hydrogel was observed, and the hydrogel showed no shrink above LCST. The synthesized hydrogels showed fast response in hot water and rapid recovery in air. Such nonshrink characteristics and excellent reversibility made it possible for these hydrogels to be used as temperature-controlled microfluidic switches. This work provided an approach to design fast recovery hydrogel actuators by the incorporation of hydrophilic monomers and extend the application of the hydrogel actuators into fields such as soft robots, micromanipulation, microfluidics and artificial muscles in various environments.
研究领域:
材料科学
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生物医学工程
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软体机器人技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Soft Matter
·
2018
·Vol. 14
·期 36
·7302-7309
·
IF 3.709
Jingjuan Lai,Xingjian Li,Ruiqing Wu,Jinni Deng,Yi Pan,Zhaohui Zheng,Xiaobin Ding
Many of the unique properties of a conventionally crosslinked shape memory network are not found at the same time, and this is a large challenge for the development of advanced shape memory functional materials. In this work, a topologically well-controlled network shape memory poly(ethyl methacrylate) (CN-SMPEMA) is designed and fabricated by introducing two tetra-armed functional structures simultaneously as well-defined structure units to promote switch segment and net-point uniform distribution via the combined technology of the unique controllable atom transfer radical polymerization (ATRP) and copper(I)-catalyzed azide–alkyne cycloaddition (CuAAC). Compared with conventionally crosslinked networks, the as-prepared CN-SMPEMA not only exhibits a combination of excellent mechanical properties, shape fixity, shape recovery ratios and outstanding cycling stability, but also displays rapid recoverability. Additionally, a feasible molecular mechanism for the shape memory effect of the CN-SMPEMA system is analyzed and proposed. We anticipate that such a topologically well-defined network shape memory material with multiple excellent properties will broaden the practical application range of acrylate-based shape memory polymer materials.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2023
·Vol. 14
·期 1
·1-10
·
IF 16.6
Xue Bin,Bashir Zoobia,Guo Yachong,Yu Wenting,Sun Wenxu,Li Yiran,Zhang Yiyang,Qin Meng,Wang Wei,Cao Yi
Hydrogels are promising soft materials as tissue engineering scaffolds, stretchable sensors, and soft robotics. Yet, it remains challenging to develop synthetic hydrogels with mechanical stability and durability similar to those of the connective tissues. Many of the necessary mechanical properties, such as high strength, high toughness, rapid recovery, and high fatigue resistance, generally cannot be established together using conventional polymer networks. Here we present a type of hydrogels comprising hierarchical structures of picot fibres made of copper-bound self-assembling peptide strands with zipped flexible hidden length. The redundant hidden lengths allow the fibres to be extended to dissipate mechanical load without reducing network connectivity, making the hydrogels robust against damage. The hydrogels possess high strength, good toughness, high fatigue threshold, and rapid recovery, comparable to or even outperforming those of articular cartilage. Our study highlights the unique possibility of tailoring hydrogel network structures at the molecular level to improve their mechanical performance.
研究领域:
材料科学
·
生物材料
·
组织工程
·
机械工程
✓ 已验证
DOI
PubMed
高影响因子
CHEMISTRY OF MATERIALS
·
2021
·
IF 9.811
Xiaohui Yu,Yong Zheng,Haopeng Zhang,Yufei Wang,Xiaoshan Fan,Tianxi Liu
To meet various practical requirements and enhance human experience, hydrogels possessing multifunctionality are of great significance for flexible wearable sensors. Herein, a novel strategy has been developed to fabricate nanocomposite hydrogels with a combination of excellent stretchability, rapid recoverability, self-healing, and outstanding adhesiveness. The PAAc/SiO2-g-PAAm nanocomposite hydrogels were facilely prepared through the polymerization of acrylic acid (AAc) using SiO2-g-polyacrylamide core–shell hybrid nanoparticles (SiO2-g-PAAm) as the dynamic cross-linking center. The densely dynamic hydrogen bonds between PAAc matrices and grafted PAAm chains could reversibly be destructed and reconstructed to dissipate a large amount of energy. Due to this unique feature, the formulated hydrogels showed a wide spectrum of desirable properties, including skin-mimetic modulus, excellent stretchability (1600%), exceptional self-healing properties (96.5% at ambient temperature), and fast recoverability. The sensors fabricated with the prepared hydrogels exhibited a high detection sensitivity in the strain range from 50% to 500% with a gauge factor value of 5.86, rapid response time, and good antifatigue performance. Depending on the outstanding adhesiveness, this sensor could attach to different substrates to release the real-time motion monitoring. In the practical wearable sensing test, various human motions, including tiny-scaled swallowing, laughing, and speaking, as well as large-scaled wrist, elbow, and knee movements during basketball shooting, could be sensed. These demonstrations heralded the potential application of our sensor in accurate and long-term human motion monitoring.
研究领域:
材料科学
·
纳米技术
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生物医学工程
·
传感器与执行器
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）