COMPOSITES PART B-ENGINEERING
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2022
·
IF 11.322
Liyuan Yu,Dan Yang
Owing to their fast response, high efficiency, and large deformation , dielectric elastomer actuators (DEAs) are promising candidates for application in the fields of artificial muscles, sensors, and soft robots . With the aid of the large actuated strains of natural rubber (NR) at a relatively low driving voltage , titanate oxide (TiO 2 ) nanoparticles (NPs) modified by poly(catechol/polyamine) (PCPA) and deposited by Ag NPs were prepared (labeled as TiO 2 –PCPA–Ag). Due to the synergistic effect of the enhanced interfacial polarization obtained through PCPA modification and Ag NP micro-capacitors, the dielectric constant of the TiO 2 –PCPA–Ag–NR composites increased. In addition, the flexible PCPA endowed the composites with low elastic modulus , resulting in enhanced electromechanical properties . Thus, the NR composites filled with 10 phr TiO 2 –PCPA–Ag NPs exhibited the highest actuated strain of 8.86% at an electric field of 55.94 kV/mm, which is 2.1 times of pure NR (4.30%) at 55 kV/mm. The design of the NR composites proposed in this work via the synergistic effect of an organic layer and metal NPs will play a guiding role in the preparation of novel DEAs, which could meet future requirements for the development of actuators.
研究领域:
材料科学
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纳米技术
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电活性聚合物
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智能材料
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DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2022
·Vol. 169
·期 11
·117501
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IF 4.386
Zhenhua Liu,Qiangbing Liu,Dan Liao,Jingang Yu,Xinyu Jiang
We have developed a Ni-Al layered double hydroxide (LDH) and carbon black (CB) composite for the selective electrochemical detection of hydroquinone (HQ) and catechol (CT). LDH exhibits multiple active sites and high adsorption capacity for phenolic substances. CB demonstrates high conductivity and electrocatalytic capacity. The crystal structure was characterized by X-ray diffraction, establishing the successful synthesis of flower-like LDH, and the successful combination of LDH and CB. Fourier-transform infrared spectroscopy confirmed that the LDH surface contained sufficient hydroxyl groups to adsorb CT and HQ. The morphology of LDH/CB was characterized by scanning electron microscopy, and the composition and valence confirmed by X-ray photoelectron spectroscopy. The LDH/CB sensor delivered excellent performance in terms of sensing HQ and CT, with a wide detection range (0.1–150 μM) and detection limits of 0.011 and 0.0091 μM (DL = 3.3σ/S), respectively. The excellent performance of this sensor makes it a reliable choice for detecting HQ and CT in water.
研究领域:
分析化学
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环境科学
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 9
·3913-3920
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IF 3.069
Mengxin Zhang,Meishan Li,Wangui Wu,Junkun Chen,Xiuling Ma,Zhangjing Zhang,Shengchang Xiang
In this work, ZIF-67 decorated with polyacrylonitrile (PAN) was electrospun to obtain composite ZIF-67/PAN nanofibers, which were used to construct C-ZIF-67/PAN-800 via one-step pyrolysis at 800 °C under a N2 atmosphere. Then, a strategy for constructing a sensor for the simultaneous determination of hydroquinone (HQ) and catechol (CC) was proposed using a C-ZIF-67/PAN-800-modified glass carbon electrode (GCE). Additionally, C-ZIF-67-800 was fabricated as a reference through the pyrolysis of ZIF-67 in the absence of PAN at 800 °C. C-ZIF-67/PAN-800/GCE showed much better electrochemical activity for the simultaneous determination of HQ and CC than C-ZIF-67-800/GCE. Under optimal conditions, C-ZIF-67/PAN-800/GCE exhibited a wide detection range of 1–120 μM and 1–200 μM for HQ and CC, respectively, and both detection limits were 1.0 μM. Our work proves that the electrochemical properties of MOF-derived porous carbon materials can be tuned by electrospinning.
研究领域:
材料科学
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分析化学
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产品关联
DOI
高影响因子
CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
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2019
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IF 0.931
Hong-Ying LIU,Lang-Lang ZHU,Zhi-Heng HUANG,Yu-Bing QIU,Han-Xiao XU,Jia-Jun WEN,Wei-Wei XIONG,Li-Hua LI,Chun-Chuan GU
An electrochemical sensor was successfully fabricated by coupled ammoniated modification with PBS activation on glassy carbon electrodes (CA-GCE) and characterized by electrochemical impedance spectra. The CA-GCE showed outstanding electrochemical performance, and was applied to simultaneous detection of resorcinol (RC), catechol (CC) and hydroquinone (HQ), which could be ascribed to new active sites by the introduction of amino and oxygen-containing groups and H-bonds formed between hydroxyl groups of RC, CC, and HQ with amine, hydroxyl and carboxyl groups of CA-GCE. The reaction kinetics of RC, CC, and HQ and their reaction on CA-GCE were studied. Experimental results showed that the electrochemical reaction was adsorption controlled. Under the optimal conditions, the linear detection ranges for RC, CC, and HQ were 5–200 μM, 10–300 μM, and 1–300 μM, respectively, with their detection limits of 0.47, 0.23 and 0.46 μM, respectively. Interference and repeatability was further investigated. This strategy opened a new horizon for qualitative and quantitative detection of dihydroxy benzene.
研究领域:
分析化学
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电化学
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环境科学
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产品关联
DOI
高影响因子
POLYMER
·
2019
·
IF 3.771
Dan Yang,Yufeng Ni,Yingjie Xu,Xinxin Kong,Yancong Feng,Liqun Zhang
In this study, a highly efficient and cost-effective approach was developed to improve the electromechanical properties of nitrile-butadiene rubber (NBR). BaTiO 3 (BT) nanoparticles were firstly co-deposited with poly(catechol/polyamine) (PCPA) then grafted with γ-methacryloxypropyl trimethoxy silane (KH570) to form BT-PCPA-KH570 core-shell nanoparticles. The C C in KH570 participated in vulcanization with NBR rubber during crosslinking process to yield improved dispersions and interfacial interactions. This, in turn, enhanced the dielectric and electromechanical properties, as well as the dielectric strengths. The 50 phr BT-PCPA-KH570/NBR composites exhibited an actuated strain of 21.9%, which was ~4.36-folds higher than that of pure NBR (5.0%). Overall, the proposed modification route looks promising in industry for other dielectric fillers based high-performance dielectric elastomers .
研究领域:
材料科学
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高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
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2020
·
IF 8.247
Dahua Yao,Jianwen Feng,Jun Wang,Yonghong Deng,Chaoyang Wang
Highly adhesive binders are developed to prolong the cycle life of silicon anodes and accelerate their practical application. A series of poly(N-methacryloyl-3,4-dihydroxy- l -phenylalanine) (PMDOPA) binders, containing ultra-high content of catechol groups, are synthesized through radical polymerization and applied to silicon anodes. The ultra-high content of catechol groups endows the PMDOPA binder superior adhesive strength compared to the carboxyl groups of the polyacrylic acid (PAA) binder. As the molecular weight increases, the flexibility, solvent resistance and adhesive strength of the PMDOPA binders are all enhanced, which effectively alleviates the electrode pulverization during long-term cycling and prolongs the cycle life of batteries . Especially, the PMDOPA-20 binder, which possesses the highest molecular weight of 208 kDa among all the PMDOPA samples, exhibits the longest cycle life of 665 cycles at the current density of 840 mA g −1 , even though its molecular weight is lower than PAA. This work demonstrates that both the functional adhesive group and molecular weight are crucial for binder performance, which provides a valuable reference for the future development of high-performance binders.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2023
·
IF 11.2
Yan Du,Xingtao Chen,Lin Li,Heng Zheng,Aiping Yang,Hong Li,Guoyu Lv
Although hemostatic powders have excellent adaptability for irregular and inaccessible wounds, their hemostasis for continuous bleeding or bleeding wounds of non-compressible organs remains a critical challenge. Herein, a series of benzeneboronic acid-modified sodium alginate/catechol-modified quaternized chitosan (SA-BA/QCS-C, SBQCC) powders is developed by borate ester crosslinking for non-compressible hemorrhage control. SBQCC powders possess remarkable tissue adhesion, rapid self-gelation, good cytocompatibility and antibacterial activity against S. aureus and E. coil . The blood coagulation assays show that SBQCC powders display excellent blood clotting ability due to the synergistic effect of SA-BA and QCS-C. The SBQCC2 powder with the SA-BA to QCS-C mass ratio of 5 to 3 has the greatest effect on the blood-clotting rate. Upon depositing SBQCC2 powder to bleeding wounds of rabbit liver, the powder can absorb a large amount of blood and form a stable hydrogel physical barrier at the bleeding wounds in situ to achieve non-pressing rapid hemostasis. The SBQCC2 powder also has good biocompatibility and can be degraded in vivo. Altogether, the SBQCC powders can be a promising candidate for rapid hemostasis, and these findings may provide a new perspective for improving the hemostatic efficiency of the hemostatic powder in biomedical fields.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2023
·
IF 11.2
Xinxin Yang,Bowen Zhang,Jingjing Li,Minggui Shen,He Liu,Xu Xu,Shibin Shang
Self-healing, self-adhesive, and stretchable bio-based conductive hydrogels exhibit properties similar to those of biological tissues, making them an urgent requirement for emerging wearable devices. The primary challenge lies in devising straightforward strategies to accomplish all the aforementioned performances and achieve equilibrium among them. This study used the natural compound thioctic acid (TA) and modified cellulose to prepare conductive hydrogels with stretchability, healing, and self-adhesion through a simple one-step strategy. Metastable poly(TA) was obtained through ring-opening polymerization of lithiated TA, followed by the introduction of dopamine-grafted cellulose nanofibers (DCNF) to stabilize poly(TA) and prepare PTALi/DCNF hydrogels with the aforementioned properties. The hydrogels demonstrated remarkable conductivity, attributed to the existence of Li + ions, with a maximum conductivity of 17.36 mS/cm. The self-healing capacity of the hydrogels was achieved owing to the presence of disulfide bond in TA. The introduction of DCNF can effectively stabilize poly(TA), endow the hydrogel with self-adhesion ability, improve the mechanical properties, and further enhance the formability of hydrogels. Generally, bio-based PTALi/DCNF hydrogels with stretchability, self-healing, self-adhesion, and conductivity are obtained through a simple strategy and used as a sensor with a wide response range and high sensitivity. Hydrogels have significant potential for application in wearable electronic devices, electronic skins, and soft robots.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS & DESIGN
·
2023
·
IF 8.4
Lin Li,Dongfan Chen,Jiale Chen,Chao Yang,Youyun Zeng,Ting Jin,Yanmei Zhang,Xiaoyu Sun,Hongli Mao,Zhixiang Mu,Xinkun Shen,Zhanwei Ruan,Xiaojun Cai
The development of functional wound dressings capable of both rapid hemostasis and high-efficiency antimicrobial is essential for the management of severe bleeding wounds. Cotton dressings are widely used in clinical practice; however, few dressings can simultaneously achieve rapid hemostasis and high-efficacy antimicrobial. Herein, a versatile cotton dressing (GCQCNF-5) was masterly developed by sequentially deposition catechol modified quaternary chitosan (CQCS) and gelatin onto a cotton nonwoven fabric (NF) surface. Because of the presence of a gelatin sponge layer with suitable thickness and porosity on its surface, GCQCNF-5 exhibits a notably enhanced hemostatic effect compared to NF both in vitro and in vivo , which is even slightly superior to that of MHS (a commercial gelatin hemostatic sponge). Moreover, after exerting a rapid hemostasis effect, GCQCNF-5 can further exploit CQCS to exert excellent immediate antimicrobial and long-lasting bacteriostatic effects. In vivo wound healing experiments further indicated that GCQCNF-5 could significantly promote rapid healing of infected wounds by effectively sterilizing, absorbing exudates, and providing moist healing environments. This study clearly demonstrated that GCQCNF-5 is a versatile wound dressing that can achieve simultaneously rapid hemostasis, high-efficiency antimicrobial, and promote rapid healing of infected wounds, with great application potential for the treatment of severe bleeding wounds.
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 42
·51251
·
IF 3.125
Yongzhen Lei,Long Mao,Heping Zhu,Jin Yao
In order to solve the problems of traditional plastic packaging materials like poor degradability and insufficient active packaging function, this study successfully designs and synthesizes tannic acid (TA)-titanium (Ti) dual network coated hydrotalcite-like layered clay (LDHs@TA-Ti) and catechol grafted chitosan (C-CS) based on the principle of mussel bionics. And a novel idea is first put forward to fabricate LDHs@TA-Ti/C-CS/polyvinyl alcohol (PVA) nanocomposite films by solution casting method. The result of infrared and thermal analysis indicate that strong interfacial interaction is formed in the nanocomposites, which leads to the limitation of molecular chain movement and the increase of glass transition temperature. Although the addition of LDHs@TA-Ti significantly increases the crystallization temperature, the crystallinity does not change significantly. The water resistance, UV barrier, tensile strength and antibacterial properties of the final nanocomposite films are improved significantly, and all the films show good transparency in the visible range. Especially when the addition amount of LDHs@TA-Ti reaches 1 wt %, compared with C-CS/PVA composite film, the UV (at 300 nm) barrier property and tensile strength are increased by 36.3% and 45.1% respectively. Therefore, LDHs@TA-Ti/C-CS/PVA nanocomposite films show great potential as environmentally friendly active packaging films or coatings in extending the shelf life of food products.
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2020
·Vol. 45
·期 3
·1721-1726
·
IF 3.288
Yin Zheng,Jiabing Chen,Youluan Lu,Xinjian Song,Zhen Shi
Three-dimensional interconnected porous carbon nanosheets were prepared through pyrolyzing sodium D-isoascorbic acid, and were thoroughly characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD). The specific surface area and pore size distribution of the porous carbon nanosheets were characterized by N2 adsorption desorption. The thickness of the carbon nanosheet was measured by atomic force microscopy (AFM). An electrochemical sensor was fabricated by the modification of the porous carbon nanosheets onto a glassy carbon electrode surface. The electrochemical behaviors of hydroquinone (HQ) and catechol (CA) on the electrochemical sensor were investigated by cyclic voltammetry and differential pulse voltammetry. Under the optimized conditions, the peak currents were found to be linear to the HQ and CA concentrations in the range from 0.4 to 20 μmol L−1, and the detection limits were 0.028 μmol L−1 (HQ) and 0.035 μmol L−1 (CA), respectively.
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产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2020
·
IF 3.807
Zhimin Liu,Hao Wu,Xianguo Ge,Haijun Zhan,Leqian Hu
Graphitic carbon nitride quantum dots (g-CNQDs) with special structures have exhibited fascinating advantages over the common QDs. In this work, we report a novel Ru(bpy) 3 2+ /g-CNQDs electrochemiluminescence (ECL) system, and the effect of g-CNQDs on the ECL signal of Ru(bpy) 3 2+ was discussed. It was found that g-CNQDs containing in proposed ECL system played an important coreactant role in ECL signal enhancement of Ru(bpy) 3 2+ , which was proved by electrochemical, ultraviolet, and ECL experiments. Based on the quenching effect of catechol on the ECL signal of Ru(bpy) 3 2+ /g-CNQDs, a quenching-based ECL system was designed for catechol determination. The ECL sensing system demonstrated high sensitivity to catechol, with a linear range from 10 nM to 2 mM and a detection limit of 2.5 nM (S/N = 3). The sensor was adopted for catechol analysis in tea samples with satisfactory results.
研究领域:
分析化学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）