BIOMACROMOLECULES
·
2023
·
IF 6.2
Xuan Cao,Qinglong Cao,Taoyi Zhang,Wenxi Ji,Usman Muhammad,Jing Chen,Yun Wei
Hydrogel-based flexible strain sensors have been known for their excellent ability to convert different motions of humans into electrical signals, thus enabling real-time monitoring of various human health parameters. In this work, a composite hydrogel with hydrophobic association and hybrid cross-linking was fabricated by using polyacrylamide (PAm), surfactant sodium dodecyl sulfate (SDS), lauryl methacrylate (LMA), and polypyrrole (PPy). The dynamic dissociation-conjugation among LMA, SDS, and PPy could dissipate energy to improve the toughness of hydrogels. The SDS/PPy/LMPAm composite hydrogel with a toughness of 1.44 MJ/m3, tensile fracture stress of 345 kPa, tensile strain of 1021%, and electrical conductivity of 0.57 S/m was obtained. Furthermore, an interdigital electrode flexible pressure sensor was designed to replace the bipolar electrode flexible pressure sensor, which greatly improved the sensitivity and resolution of the pressure sensor. The SDS/PPy/LMPAm composite hydrogel-based interdigital electrode flexible pressure sensor showed extraordinary stability and identified different hand gestures as well as monitored the pulse signal of humans. Moreover, the characteristic systolic and diastolic peaks were clearly observed. The pulse frequency (65 times/min) and the radial artery augmentation index (0.57) were calculated, which are very important in evaluating the arterial vessel wall and function of human arteries.
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PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 43
·2303272
·
IF 19
Si Yu Zheng,Jiahui Zhou,Mengjie Si,Shuaibing Wang,Fengbo Zhu,Ji Lin,Jimin Fu,Dong Zhang,Jintao Yang
Polyzwitterionic hydrogel is an emerging material for solar-driven water evaporation in saline environment due to its special anti-polyelectrolyte effect, which is a promising approach to co-generation of freshwater and electricity. However, the molecular impact on anti-polyelectrolyte effect remains unclear, let alone to optimize the zwitterionic structure to promote water evaporation efficiency in high-salinity brine. Herein, a molecularly engineered zwitterionic hydrogel is developed and the incorporated phenyl-methylene-imidazole motif greatly enhances the salt binding ability and strengthens anti-polyelectrolyte effect, leading to boosted hydration, improved salt tolerance, ultra-low evaporation enthalpy (almost half of traditional zwitterionic gel), and durable anti-microbial ability in brine. Besides, gradient solar-thermal network is penetrated to optimize water transport channel and heat confinement. The gel exhibits excellent evaporation rate of 3.17 kg m −2 h −1 in seawater, which is 1.6 times of that in water and such high efficiency could be maintained during 8 h continuous desalination, demonstrating outstanding salt tolerance. The high flux of ion stream can generate considerable voltage (321.3 mV) simultaneously. This work will bring new insights to the understanding of anti-polyelectrolyte effect at molecular level and promote materials design for saline water evaporation.
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高影响因子
Polymers
·
2023
·Vol. 15
·期 12
·2735
·
IF 5
Qizhong Xiong,Lei Zhang,Zijun Zhu,Gang Xu,Jianyuan Jing,Weifeng Zhang,Chaochun Zhang,Xinxin Ye
Cellulose, a kind of polymer containing abundant functional groups, has widespread use in the adsorptive removal of environmental pollutants. An efficient and environmental friendly polypyrrole (PPy) coating approach is employed to modify the agricultural by-product straw derived cellulose nanocrystal (CNC) into excellent property adsorbents for removing the heavy metal ion of Hg(II). The FT-IR and SEM-EDS results demonstrated that PPy is formed on the surface of CNC. Consequently, the adsorption measurements proved that the obtained PPy-modified CNC (CNC@PPy) possesses a remarkably enhanced Hg(II) adsorption capacity of 1095 mg g−1, owing to a plentiful functional group of doped Cl element on the surface of CNC@PPy by forming Hg2Cl2precipitate. The results of the study suggest that the Freundlich model is more effective than the Langmuir model at describing the isotherms, while the pseudo-second order kinetic model is better suited to correlating with the experimental data compared to the pseudo-first order model. Further, the CNC@PPy exhibits an outstanding reusability, capable of maintaining 82.3% of its original Hg(II) adsorption capacity after five successive adsorption cycles. The findings of this work reveal a method to convert the agricultural by-product into high performance environmental remediation materials.Keywords:CNC;CNC@PPy;Hg(II) adsorption;agricultural waste
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高影响因子
Journal of Materials Chemistry C
·
2023
·
IF 6.4
Qian Zhang,Wenchao Ye,Guojiao Li,Yanli Gong,Wenlang Liang,Yongxiang Leng
In this research, we introduce a novel nanotubular-aerogel/hydrogel hybrid (NAHH), a promising material for wearable motion sensors, which combines poly(acrylic acid) (PAA) hydrogel with a polypyrrole (PPy) nanotubular-aerogel network to form a hierarchically porous structure. The NAHH outperforms its individual components in terms of mechanical properties, with an fracture toughness of ∼97 kPa for NAHH-1, compared to ∼1.8 kPa and ∼15.3 kPa for PPy nanotubular-aerogel and PAA hydrogel, respectively. The hybrid material also exhibits robust adhesion to a variety of substrates, including porcine skin, with tensile and shear adhesive strengths of ∼54.7 ± 8.4 kPa and ∼58.1 ± 4.4 kPa, respectively. The incorporation of didecyldimethylammonium bromide (DDAB) imbues the NAHH with effective antibacterial properties against both Gram-negative and Gram-positive bacteria. The biocompatibility of the NAHH is further confirmed through a live/dead assay using murine fibroblast 3T3 cells. The NAHH-based motion sensors excel in real-time monitoring of bending and extending motions across various human joints, underscoring their potential for wearable electronic applications. This study presents a versatile platform for the creation of advanced multifunctional materials, with implications for the future of wearable electronics, bioelectronics, and tissue engineering.
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高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Shihao Wang,Xinling Yu,Nian Li,Shudong Zhang,Cui Liu,Min Xi,Obaid Iqbal,Sarmad Ali,Zhenyang Wang
Constructing a reasonable electrode structure to achieve high energy density , long cycle life, and excellent rate performance for supercapacitors through simple and mild preparation methods remains challenging. In this work, the hierarchical porous polypyrrole (PPy) with high pseudocapacitive activity and sufficient electrolyte ion transport channels is uniformly coated on carbon cloth (CC) fibers by an electrochemical deposition method with the help of nano-silica as the self-sacrificing template to construct the CC@PPy composite with an improved surface area and porosity. By optimizing the loading and porosity of the electroactive material through electrodeposition time, the specific capacitance of the CC@PPy electrode reached an impressive value of 670.2 F g −1 . The as-fabricated asymmetric solid-state supercapacitor (ASSC) built with the optimized 3D porous CC@PPy electrode exhibited a specific capacitance of up to 142.5 F g −1 at 1.0 A g −1 , superior rate capability, and outstanding cyclic stability (capacitance retention up to 90.3 % after 10,000 cycles). Furthermore, the ASSC achieved a high energy density of 64.1 Wh kg −1 at a power density of 900.0 W kg −1 . These results offer valuable guidance for the design and preparation of high-performance flexible electric energy storage devices.
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ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Ye Liu,Huijie Liu,Ailin Li,Xinyang He,Rongwu Wang,Jianyong Yu,Liming Wang,Xiaohong Qin
Electrospun nanofiber-based evaporators have emerged as advanced candidates in the field of solar-driven desalination, stemming from their favorable flexibility, high porosity, and ease of functionalization. Herein, a novel and facile template-free method is developed for preparing polypyrrole nanorod-adorned nanofibrous aerogels, which are reliable and efficient for solar desalination. More notably, polypyrrole plays a crucial cross-linking role in promoting structural stability, avoiding the use of harmful cross-linkers. The presence of polypyrrole nanorods has further augmented light absorption, decreased vaporization enthalpy, and enhanced evaporation performance with an optimal evaporation rate of 2.37 kg m–2 h–1. In addition, the hierarchically structured nanofibrous aerogel enables durable and stable evaporation out of high-concentration brines, superior to most of the electrospun nanofiber-based evaporators. Taking advantage of the excellent photothermal property, the aerogel assembled with a thermoelectric generator can obtain 58.59 mV voltage output under one sun illumination. The exceptional aerogel holds great potential in harnessing solar energy to address the issue of water and energy scarcity.
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高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2023
·
IF 5.1
Xiaoyu Zhang,Keyu Feng,Peng Yin,Yuqi Pan,Yujie Liu,Fanglei Zeng,Ning Li,Gang Yi,Zhongwei Wang
The flexible sensor with self-healing performance can heal itself when the sensor is damaged by the outside world, so it can significantly improve the service life of the sensor and reduce the repair cost, which has attracted widespread attention. However, currently, most flexible sensors with self-healing performance have problems such as single repair conditions and difficulty in balancing mechanical performance and repair efficiency. In this study, polypyrrole modified carbon nanotubes (PPY/CNTs) were first made, and then, inspired by the Chinese traditional myth “Nuwa Fuxi”, a multiple dynamic crosslinking self-healing composite poly(siloxane-urethane) conductive elastomer (CPUSi) was successfully developed. The prepared CPUSi has excellent mechanical properties (11.27 MPa) and total shear repair efficiency (84%) under the excitation of multiple dynamic reversible interactions. At the same time, the surface scratch of CPUSi can be self-healing under multiple conditions such as heating at 60 °C, infrared light and ultraviolet light. The scratch repair efficiency is up to 99.9% under infrared light for 2 h. in addition, CPUSi has cyclic response to temperature and strain, so the material has broad application prospects in sports monitoring, electronic skin, intelligent wear, brain-computer interface and other fields
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高影响因子
Small
·
2023
·Vol. 19
·期 49
·2304060
·
IF 13.3
Haoran Da,Wenhao Fang,Jiufu Zhu,Jin Li,Shanshan Pan,Jiajia Li,Jiaqi Huang,Haitao Zhang,Suojiang Zhang
As spent batteries can be considered as alternative raw sources of electrode materials; the development of regeneration techniques for spent graphite becomes key to realizing economic and environmental sustainability. Herein, the reutilization of small spent graphite particles is domonstrated due to their special structural characteristics, which may directly contribute to the improvement of lithiation kinetics and high-rate charging during long-term cycling. Such intrinsic defects and external cracked channels may be introduced by the aging of intrinsic bulk structure and exfoliation of surface structure. On account of these potential advantages, a carbonized polypyrrole layer on sieved small graphite particles is developed to obtain superior rate performance. The coated amorphous/graphitic layer could repair the exposed edge and basal plane, and significantly facilitate Li ion diffusion during fast charging. Moreover, the enhanced performance may favor the improved homogeneity of current density distribution during fast charging, which is confirmed by a porous electrode model. The regenerated graphite with a disorder/order coating layer could effectively regulate the Li + transport channel, exhibiting a high specific capacity at high-rate charging (102.7 mAh g −1 at 4 C after 500 cycles) without severe Li plating. This work provides an opportunity to utilize spent graphite in fast-charging batteries.
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高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Dan Guo,Congpu Mu,Qian Liu,Bochong Wang,Jianyong Xiang,Anmin Nie,Kun Zhai,Yu Shu,Tianyu Xue,Fusheng Wen,Zhongyuan Liu
With the rapid development of miniaturization, high power, and high integration of electronic components, multifunctional electromagnetic interference (EMI)-shielding materials have attracted tremendous attention. Herein, the flexible multifunctional EMI-shielding aramid nanofiber/polypyrrole (ANF/PPy) composite films are prepared through a facile vacuum filtration method, which exhibits excellent broadband EMI shielding performance, wearable sensing, Joule heating, and photothermal conversion. The ANF/PPy-4 composite film with a thickness of 46 μm displays an outstanding EMI shielding effectiveness (EMI SE) of 35 dB in the frequency range of 6–26.5 GHz due to the introduction of conductive PPy. The EMI SE of the ANF/PPy-4 composite film per unit thickness can achieve 826.0 dB mm–1. A tensile strength of 132 MPa and fracture strain of 5.2% can be achieved, indicating the superior mechanical properties of the ANF/PPy-4 composite film. Furthermore, the ANF/PPy composite film can monitor human motions (such as finger, wrist, elbow, knee, ankle, forearm, and throat) due to piezoresistive response. In addition, the saturation temperature of the ANF/PPy-4 composite film is about 77 °C at a low voltage of 5.0 V. Moreover, the temperature of the ANF/PPy-4 composite film can reach 54 °C via photothermal conversion under one sun irradiation. Multifunctional ANF/PPy composite films show enormous potential application for broadband frequency EMI shielding, wearable sensing, and personal thermal management.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Xiangyi Zhang,Bin Shang,Kaimin Deng,Dongdong Ma,Mengyao Zhu,Xuanfeng Jiang,Yuan Zhan,Shaojin Gu,Xin Liu,Weilin Xu
High-quality solar evaporators with all-in-one design are highly desirable for vapor generation, but relevant research is scarce. In this study, a three-dimensional (3D) porous polypyrrole/polydopamine (PPY/PDA) structure was fabricated via a simple heating-assisted rapid oxidative polymerization method. The obtained evaporator has multiple features, and can simultaneously provide rapid water transport channels (average pore sizes ∼ 18.37 nm), low thermal conductivity (0.071 W m −1 K −1 ), high solar absorbance (97.08%), and good mechanical properties. When it is employed as an evaporator, the calculated water evaporation rate is approximately 2.12 kg m -2 h −1 , which is comparable to other reported 3D evaporators. Additionally, the evaporator displays great potential for purification toward various nonpotable water, as well as reliable pure water yields in an outdoor application (from 8:00 am to 5:00 pm, the evaporator can produce at least 13.95 L of drinkable water for a 1 m 2 sample). We believe that the proposed strategy to fabricate all-in-one evaporators has great significance for scientific research and practical applications.
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高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Liting Wei,Haiying Yang,Jiao Jiao
In this study, polypyrrole functionalized graphene sheets (PPY-GNs) have been used for the first time as a reinforced material for the ultrasensitive detection of atorvastatin by the electrochemistry method. The obtained PPY-GNs were characterized by scanning electron microscopy (SEM) and Fourier transform infrared (FT-IR) spectroscopy. Due toits porous structure, the PPY-GNs-modified electrode has a large effective area, thereby improving the sensitivity of detection. The peak currents of atorvastatin at the GNs-modified glassy carbon electrode (GNs/GCE) and those at the PPY-GNs/GCE are increased dramatically compared to those on the bare GCE. The peak current at the PPY– GNs/GCE linearly increases with the increase in the atorvastatin concentration, which ranges from 20μM to 200μM. The detection limit of atorvastatin reaches 1.191μM based on the signal-to-noise characteristic (S/N = 3). The PPY-GNs-based electrochemical sensor was successfully used to detect atorvastatin in tablets with satisfactory results.
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高影响因子
Surfaces and Interfaces
·
2023
·
IF 6.2
Guoqing Feng,Shihan Wang,Siqing Wang,Pengcheng Wang,Chuntao Wang,Andargie Abebe Setiye,Massamba-Courtois Joanes Benedicte,Jingkun Xiao,Chengwen Song
Assembling a heterojunction-based composite nanomaterial to simultaneously achieve higher response and superior selectivity towards NO 2 under room-temperature conditions remains a great challenge. In this work, the MXene@Polypyrrole heterojunction was synthesized via a facile in-suit chemical polymerization approach. The distribution of sphere-like PPy nanoparticles was confirmed via various characterization techniques. The response value of the 0.5MXP sensor toward 50 ppm NO 2 is significantly higher than that of the pristine MXene based sensor, entailing greater response (6.5-fold). Nearly 98.11% recovery to the base resistance was observed in each sensing cycle. Noteworthy, the Schottky barriers formed between MXene and PPy contact surface, leading to the ideal selectivity and a lower limit of detection. Additionally, the sensor was tested for a 31-days-period with minimal deviation, predicting outstanding reproducibility and durability. The detailed polypyrrole sensitization mechanism containing selectivity mechanism, underlying heterojunction mechanism as well as the Density Function Theory (DFT) calculation were also revealed, offering new ideas for the development of room-temperature nitrogen dioxide sensors. Simultaneously, DFT calculation (21 models, 42 images) revealed the adsorption energy, electron transfer , and charge density differences between the NO 2 molecules and the substrate (MXene, PPy and MXene@PPy). In summary, the outstanding MXene surface functionalization has been exploited by decorating with polypyrrole (PPy) nanoparticles.
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高影响因子
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