ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2021
·Vol. 413
·期 15
·4013-4022
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IF 4.157
Liu Chao,Zhao Yunmeng,Xu Di,Zheng Xinxin,Huang Qing
A facile and green approach to the preparation of peroxidase-like nanozymes by reducing and functionalizing graphene oxide (rGO) with Ganoderma polysaccharide (GP) has been achieved in this work. Our results showed that the as-fabricated nanozyme, namely rGO-GP, possessed the excellent property of simulating peroxidase with higher catalytic activity compared with GO or rGO obtained by using chitosan, which may be due to the better dispersion of rGO-GP in the solution. Steady-state kinetics studies further showed that the catalytic process conformed to Michaelis-Menten equation and ping-pong mechanism. Benefiting from the excellent peroxidase property of rGO-GP, we have also successfully established a highly sensitive and selective colorimetric detection approach to trace detection of l -cysteine ( l -Cys). The limit of detection (LOD) of l -cysteine is 0.1 μM and the linear detection range is 2–30 μM. Furthermore, the nanozyme was successfully applied for detecting l -cysteine in serum. This work therefore demonstrates the advantages of rGO-GP as an effective nanozyme in both its green synthesis and detecting application.
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CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Jiaxin Wang,Jinmei He,Lili Ma,Yali Yao,Xuedan Zhu,Lei Peng,Xiangrong Liu,Kanshe Li,Mengnan Qu
Textile-based triboelectric nanogenerators (t-TENGs) have attracted extensive attention in wearable power source and movement monitoring. However, the electrical output performance and environmental adaptability of t-TENGs in single-electrode mode are still unsatisfactory, which significantly limits their applications. This limitation is especially more pronounced in humid environments . In the present study, a humidity-resistant and stretchable single-electrode t-TENG (abbreviated as PFL@WFCF-TENG) consisting of the porous flexible layer (PFL) and waterproof flexible conductive fabric (WFCF) has been designed to improve the output performance. Considering the three-dimensional structure and excellent superhydrophobicity of PFL and superior conductivity of WFCF, the resultant PFL@WFCF-TENG (2 × 4 cm 2 area) has high outputs (~135 V, ~7.5 μA, 26 μC/m 2 , 631.5 mW/m 2 ) and favorable humidity-resistant (80% RH). Based on these excellent features, the proposed PFL@WFCF-TENG is expected to be applied for intelligent alarming, haptic sensing, and energy harvesting. Moreover, combined with the microelectronic module, a portable and wearable self-powered haptic controller based on the PFL@WFCF-TENG has been designed for various human–machine interface (HMI) scenarios, such as controlling of the lamp, electronic badge, computer application, and humidifier. The PFL@WFCF-TENG proposed in this study not only provides a feasible solution for developing wearable electronic devices with high electrical output even in high-humidity environments but also shows promising applications in a variety of areas, including wearable power supply, portable computer peripherals, intelligent robots and security systems.
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Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 24
·7697-7705
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IF 7.393
Wei Luo,Yi Liu,Chuangye Wang,Dan Zhao,Xiaoyan Yuan,Lei Wang,Jianfeng Zhu,Shouwu Guo,Xingang Kong
MAX phase solid solutions have attracted considerable attention owing to their unique structure and properties. However, the synthesis of MAX phase solid solutions doped with multi-elements at M-sites still remains a challenge. Herein, a series of (V1−x−yTixCry)2AlC solid solution powders are prepared through the reactions of V, Ti, Cr, and Al metals and graphite in molten NaCl/KCl salts, and their electromagnetic (EM) wave absorption properties are systematically investigated. In comparison with Ti2AlC, V2AlC and Cr2AlC, (V1−x−yTixCry)2AlC solid solutions exhibit prominent EM absorption performance. Specifically, the minimum reflection loss (RL) value of (V0.6Ti0.2Cr0.2)2AlC is −56.2 dB at 12.07 GHz with a sample thickness of 1.75 mm, and the optimized effective absorption bandwidth (EAB, RL < −10 dB) covers the whole X band with 4.16 GHz at 2.00 mm. Furthermore, the strong dielectric resonance is presented in the range of 7–13 GHz for all (V1−x−yTixCry)2AlC, indicating that both dipole polarization and conduction loss contribute to the excellent dielectric loss of doped MAX phases. Theoretical analysis demonstrates that the polarization loss is attributed to the anisotropic conductivity of MAX phases and M-site doping, which further weakens the electric conductivity. As a result, plenty of dipoles are involved and polarization relaxation occurred when the (V1−x−yTixCry)2AlC solutions are radiated by EM. Considering the numerous kinds of MAX phase solid solutions, this work paves the way to study the EM absorption performance of high-entropy or other MAX phase solid solutions.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Shaolong Li,Yusi Che,Jianxun Song,Yongchun Shu,Jilin He,Baoqiang Xu,Bin Yang
A single phase zirconium oxycarbonitride was prepared through a carbothermal reduction route at 1600 °C in nitrogen atmosphere using ZrO 2 and graphite powder as raw materials. The hot-pressed zirconium oxycarbonitride block has good stability in the NaCl-KCl melt. The anodic dissolution behavior of zirconium oxycarbonitride and the reduction mechanism of zirconium ion in NaCl-KCl melt were studied by linear sweep voltammetry, electrochemical impedance spectroscopy, cyclic voltammetry and square wave voltammetry. The results show that zirconium in the anode is oxidized to Zr 2+ ions and dissolved in the molten salt. The zirconium ions diffuse to the cathode and are reduced to zirconium metal by transferring two electrons in one step. Potentiostatic electrolysis at −2.9 V was performed between a Mo rod cathode and ZrC x O y N z anode. The cathode product was detected to be zirconium metal, which indicated that zirconium oxycarbonitride was a suitable consumable anode for the electrolytic preparation of zirconium metal.
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CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Zhenming Chu,Weicheng Jiao,Jun Li,Hongyuan Guo,Yongting Zheng,Rongguo Wang,Xiaodong He
The application of strain sensors in extreme environments (such as moisture or rain droplets) is limited by the influence of water molecules on their sensing performance. Endowing strain sensors with superhydrophobicity is a promising strategy to solve this problem. However, it remains a challenge for superhydrophobic strain sensors to completely avoid the effects of water droplets. Herein, we developed a superhydrophobic strain sensor with gradient structure for the first time by a simple one-step pre-stretching method. The strain sensor exhibits high sensitivity (maximum gauge factor of 1199.10), a broad strain range (up to 400%), robust stability (3000 cycles), a low detection limit (0.1% strain), and fast response (88 ms), which can be used to monitor full-range human body motions. Furthermore, the gradient wrinkle structure with low surface energy makes the strain sensor have gradient superhydrophobic performance, so that the impacting water droplets can automatically deviate and bounce off the surface by the Young's force, avoiding the interference of water droplets on the sensor's electrical signal. Even when the strain is up to 400%, the impacting droplet can still offset and rebound, which makes the superhydrophobic strain sensor have stable sensing performance in extreme environments.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Zhaorong Zhang,Tuxiang Guan,Xiaoyan Zhang,Liming Shen,Ningzhong Bao
Graphene fibers have great potential in yarn supercapacitors (YSCs) because of their good strength, flexibility, electrical conductivity, and ultrahigh specific surface area. Among the reported results, graphene fibers show higher capacitance properties, but their mechanical strength is relatively low. Here, we design a simple method to prepare high-performance graphene fibers with high strength and high capacitance by adding carboxymethyl cellulose (CMC) to graphene oxide (GO). The hydrogen bonding network between GO and CMC greatly improves the strength of the fiber. CMC can greatly improve the hydrophilicity of the graphene fiber, reduce the stacking of graphene sheets, increase the effective active area, and thus increase the capacitance. The as-prepared rGO–CMC fiber shows a high strength of 526.4 MPa, and the capacitance of YSCs reaches 197.7 mF/cm2.
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Polymers
·
2021
·Vol. 13
·期 11
·1688
·
IF 4.329
Ao Gu,Jian Wu,Liming Shen,Xiaoyan Zhang,Ningzhong Bao
The uniform dispersion of graphene oxide (GO) and strong interfacial bonding are the key factors in achieving the high mechanical strength of GO/polymer composites. It is still challenging to prepare GO/PA66 composites with uniform GO dispersion by the in situ polymerization method. In this paper, we prepare GO/PA66 salt nanocomposite by in situ precipitating PA66 salt with GO in ethanol. The GO/PA66 nanocomposite fibers are then fabricated using the as-prepared GO/PA66 salt by in situ polymerizing and melt spinning. By tuning the GO content, the tensile strength and Young’s modulus of the GO/PA66 fibers are increased from 265 ± 18 to 710 ± 14 MPa (containing 0.3 wt% GO) and from 1.1 ± 0.08 to 3.8 ± 0.19 GPa (containing 0.5 wt% GO), respectively. The remarkable improvements are attributed to the uniform dispersion of GO in the GO/PA66 salt nanocomposite via ionic bonding and hydrogen bonding in the in situ precipitation process, and the covalent interfacial bonding between the GO and PA66 during the in situ polymerization process. This work sheds light on the easy fabrication of high-performance PA66-based nanocomposites.Keywords:Polyamide 66;GO;in situ precipitation;dispersion;mechanical properties
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JOURNAL OF ELECTRONIC MATERIALS
·
2021
·Vol. 50
·期 8
·4557-4566
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IF 1.938
Liu Gu,Zhang Yukun,Xu Kejun,Wang Liuying,Xiong Shanxin
Composite supercapacitive materials can combine two different kinds of electrode materials with different energy storage mechanisms, as well as present enhanced supercapacitive performance. In this paper, a reduced graphene oxide aerogel (GA) was prepared with an adjustable pore structure and used as a matrix for loading of secondary active material (MnO 2 ) through an electrochemical deposition method. The influences of the deposition time and deposition voltage on the electrochemical behaviors and specific capacitances of MnO 2 /GA composites were studied. The unique three-dimensional porous structure of GA can act as a good matrix for MnO 2 . The results show that when the deposition time is 30 s and deposition voltage is 1.0 V, the MnO 2 /GA composite has the highest specific capacitance of 664 F/g at a current density of 1 A/g. Compared with neat GA, the specific capacitance of the MnO 2 /GA composite is enhanced by 190%, which can be assigned to the co-contribution of two kinds of active materials, a facile ion diffusion path through the porous structure, and good electron conductivity of the GA.
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TRIBOLOGY INTERNATIONAL
·
2021
·
IF 4.872
Ting Xie,Yaru Shi
The friction transfer of polytetrafluoroethylene (PTFE) composites is closely related to their tribological performances . To clarify the effects of LaF 3 /CeF 3 on the friction transfer of PTFE-based composites, the transfer film thickness and coverage were investigated under different loads or speeds. The results show that the addition of LaF 3 /CeF 3 can decrease the transfer film thickness and increase the transfer film coverage to form a thin and uniform transfer film, and the co-filling of LaF 3 and CeF 3 is better in promoting friction transfer of PTFE-based composites than single addition of LaF 3 or CeF 3 . The correlation between transfer film and tribological properties was also analyzed, which indicates that the friction transfer is beneficial for improving the tribological properties of PTFE composites.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 37
·50938
·
IF 3.125
Jingguang Wang,Zemin Xia,Jian Liu,Naiyue Zhang,Wuyi Zhou,Zichong Zhong,Zhitian Luo,Wenyu Li,Zhuohong Yang,Yang Hu
In this work, the near-infrared (NIR) light-responsive shape memory scaffolds with hierarchical porous structures are designed and facilely formed by freeze drying of 3D printed viscous gel-like pickering emulsions, which are stabilized by hydrophobically modified graphene oxide (g-GO) and silica nanoparticles, and contain thermo-responsive poly( d , l -lactic acid-co-trimethylene carbonate) (PLMC) in the oil phase. The prepared scaffolds display an interconnected filament structure with hierarchical pores and high porosity. The incorporation of g-GO nanoparticles into PLMC matrix prompts that the scaffold shape memory can be triggered by NIR light with fast shape recovery. Moreover, the in vitro mineralization experiment shows that the scaffolds have biological activity, and the drug release study demonstrates that the scaffolds can be used as drug carriers with efficient drug release capacity. Furthermore, cell culture assays based on mouse bone mesenchymal stem cells exhibit that the scaffolds own good cytocompatibility. Therefore, the facile preparation and remote activation of the shape memory nanocomposite scaffolds with hierarchical porous structure and multifunctionality represents a highly attractive candidate as minimally invasive implantation scaffolds for bone tissue engineering applications.
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Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 15
·9634-9643
·
IF 12.732
Zhenming Chu,Weicheng Jiao,Yifan Huang,Yongting Zheng,Rongguo Wang,Xiaodong He
Flexible strain sensors have potential applications in electronic skin, healthcare monitoring, human–machine interface, and other fields. The key challenge in the use of the strain sensor for human motion monitoring is that both broad strain range and full-range high sensitivity have to be achieved simultaneously. Herein, we report a gradient wrinkle strain sensor based on reduced graphene oxide (rGO) and polydimethylsiloxane (PDMS) by a simple pre-stretching method, which includes two wrinkle regions. One region contributes to high sensitivity through wrinkle cracks during stretching, and the other region maintains good contact to provide a broad strain range. The sensitivity can be easily adjusted according to the gradient wrinkle structure. The sensor exhibits a broad strain range (up to 300%), ultra-high sensitivity (a maximum gauge factor (GF) of 167 665.6), good stability (10 000 cycles), and a low detection limit (0.1% strain). It can be used to detect full-range human body motions, including subtle physiological signals and large motions. Besides, the sensor has good super-hydrophobicity and anti-corrosion property, which can be used in humidity, underwater, acid, alkali, and other harsh environments. This new structure and sensing mechanism of the strain sensor provides a new idea for achieving high sensitivity in the full range.
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FOOD CHEMISTRY
·
2021
·
IF 7.514
Guozheng Zhao,Binhua Zhou,Xiuwen Wang,Jian Shen,Bo Zhao
Based on the successful synthesis of mercaptomethamidophos as a substrate, a novel nanogold/mercaptomethamidophos multi-residue electrochemical biosensor was designed and fabricated by combining nanoscale effect, strong Au–S bonds as well as interaction between acetylcholinesterase (AChE) and mercaptomethamidophos, which can simultaneously detect 11 kinds of organophosphorus pesticides (OPPs) and total amount of OPPs using indirect competitive method. Electrochemical behavior of the modified electrode was characterized by differential pulse voltammetry (DPV) and electrochemical impedance spectroscopy (EIS). The AChE concentration and incubation time were optimized at 37.4 °C to achieve the best detection effect. This biosensor exhibits excellent electrochemical properties with a wider linear range of 0.1 ~ 1500 ng·mL −1 , lower detection limit of 0.019 ~ 0.077 ng·mL −1 , better stability and repeatability, which realizes the rapid detection of total amount of OPPs, and can simultaneously detect a large class of OPPs rather than one kind of OPP. Two OPPs (trichlorfon, dichlorvos) were detected in actual samples of apple and cabbage and achieved satisfactory test results.
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