RSC Advances
·
2022
·Vol. 12
·期 43
·27940-27947
·
IF 4.036
Pengfei Wang,Bin Luo,Ke Liu,Cheng Wang,Hongtu Dong,Xiaodong Wang,Peichen Hou,Aixue Li
Aflatoxin B1 (AFB1), one of the most common mycotoxins in food matrixes, has been identified as the most toxic contaminant with mutagenic, teratogenic, immunosuppressive, and carcinogenic effects. In this study, an electrochemical aptamer sensor was developed for the on-site detection of AFB1. Carboxylated graphene oxide (COOH–GO) and carboxylated multi-walled carbon nanotubes (COOH–MWNT) nanocomposites, dopamine polymers (pDA) and gold nanoparticles (AuNPs) were used to enhance the electrochemical activity and the biocompatibility of the screen-printed electrodes (SPE). Once AFB1 was captured by the aptamer immobilized on the electrode surface, the redox current of [Fe(CN)6]3−/4− decreased. Therefore, the binding of aptamer (Apt) and AFB1 can be reflected by the change of the peak current. The as-prepared sensor showed a wide detection range of 0.1 fg ml−1–100 pg ml−1 and a low detection limit of 15.16 ag ml−1. It is also simple and low-cost, which shows great potential in practical application.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 27
·21985-21994
·
IF 2.779
Zhang Hongda,Zhou Hong,Ge Jing,Liu Guolong,Tu Xuesong,Jin Liguo
Graphene oxide (GO) was prepared by improved Hummer's method and silica hollow sphere (SHS) was fabricated by improved template method. The GO-SHS hybrids were prepared by modified SHS attached to modified GO surface, following which the GO-SHS hybrids were introduced into the epoxy resin (EP) matrix to synthesize GO-SHS/EP composites. The results showed that the mechanical and dielectric properties of GO-SHS/EP composites were enhanced. With the content of 0.3 wt.% GO-3 wt.% SHS, the GO-SHS/EP composites achieved impact and flexural strengths of 23.4 kJ/m 2 and 148.4 MPa, respectively, which improved 369% and 72%, respectively, compared with pure EP. At 10 3 Hz, the dielectric constant of GO-SHS composite is 3.17, which is significantly lower compared to 3.79 for pure EP. This will provide an opportunity to expand the application of epoxy composites in electronic packaging.
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Materials Research Express
·
2021
·Vol. 8
·期 10
·105009
·
IF 1.62
Pham Tan Thi,Le Van Thang,Tran Van Khai,Tran Xuan Diem,Chau Ngoc Trong Nghia,Tran Thi Thanh Ngan,Le Minh Tri,Nguyen Ngoc Vinh,Nguyen Minh Hien
p-Aminophenol (PAP) is an important intermediate reagent in the synthesis of paracetamol, widely used as an analgesic and antipyretic drug. Therefore, finding an effective catalyst to improve PAP synthesis efficiency is worth studying. Among those studies, nanocomposite is the most promising material. In this study, Ag/GO nanocomposites were synthesized by reducing silver nitrate on graphene oxide (GO) with sodium borohydride as a reducing agent and characterized by SEM, EDX, XRD and UV–vis methods. The catalytic ability was investigated based on the hydrogenation reaction of p-nitrophenol (PNP). We successfully synthesized Ag/GO nanocomposite with relatively homogeneous distributions and similar particle sizes. The results showed that Ag/GO nanocomposite has an excellent catalytic activity with the yield of reduction reaction at 97%, 3 min. Moreover, this photocatalyst can easily be recovered and reused three times without any reaction efficiency reduction. We also successfully synthesized and crystallized PAP with high purity and the total yield of 45.82%. The results show that Ag/GO nanocomposite is an excellent catalyst for high-performance reactions with many useful properties, such as easily recovered and repetitive used. On top of that, Ag/GO nanocomposite is safe, less toxic and environmentally friendly.
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NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 15
·6895-6903
·
IF 3.591
Mingqian Wang,Haomiao Zhu,Jian Shen
Designing antibacterial nanomaterials with outstanding antibacterial effects has great practical significance. In this work, we developed a facile therapy tool that used CuS nanoparticles to modify graphite oxide (GO) sheets to form CuS@GO nanocomposites (NCs). At the same time, molecular dynamics simulation proved that compared with pure GO, the addition of PEG can effectively disperse GO and facilitate the enrichment of CuS on the GO surface. Then, a CuS@GO–CS hydrogel was prepared by electrostatic interaction between the CuS@GO NCs and CS hydrogel and the inherent antibacterial properties of the CS hydrogel were investigated. Meanwhile, the CuS@GO–CS hydrogel showed enhanced photothermal antibacterial properties to effectively prevent the bacteria. In vitro experiments indicated that a CS hydrogel has a certain antibacterial effect on Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli). Moreover, the CuS@GO NCs have excellent photothermal properties, and the CuS@GO NCs loaded into CS hydrogel significantly enhanced the antibacterial efficacy for S. aureus and E. coli under near-infrared (NIR) laser irradiation. Taken together, the antibacterial CuS@GO–CS hydrogel with good antibacterial properties offers significant promise as an antibacterial nanomaterial for enhanced photothermal antibacterial therapy.
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Polymer-Plastics Technology and Materials
·
2021
·
IF 2.371
Yongke Zhao,Guomin Song,Guangxin Chen,Zheng Zhou,Qifang Li
Herein, a simple strategy was proposed for multi-scale construction of low-κ epoxy composites by adding a kind of polyhedral oligomeric silsesquioxane@graphene oxide hybrids. Results revealed that the dielectric constant of the composites was decreased with increasing the frequency, and it was decreased first and then increased with increasing the fillers loading. The AC resistivity values of the composites were relatively stable over the entire range of measured frequency (higher than 104 Ω·cm). Moreover, the thermal stabilities and tensile properties of the composites were improved greatly by adding only 0.8 wt% fillers.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 7
·8890-8902
·
IF 2.478
Liu Yulong,Chen Yufei,Zhao Hui,Teng Chengjun
Graphene oxide (GO) was obtained by improved Hummers method; the pseudoboehmite (AlOOH) nanoparticles were prepared with aluminum isopropoxide by Sol–Gel method and modified by the silane coupling agent (KH-550) to get KH550-AlOOH. GO was coated by KH550-AlOOH to gain KH550-AlOOH@GO component. In the meantime, the matrix (E51-BCE) was synthesized from epoxy resin (E51) and bisphenol A cyanate (BCE). KH550-AlOOH@GO/E51-BCE composites were prepared via in situ polymerization, E51-BCE as the matrix and KH550-AlOOH@GO as the reinforcement. The micro-morphology of KH550-AlOOH@GO was investigated by Fourier transform infrared spectrometer (FT-IR) and transmission electron microscope (TEM), and the results showed that KH550-AlOOH was well distributed on the GO sheet and with abundant hydroxyl groups on its surface. The X-ray diffraction (XRD) and scanning electron microscope (SEM) of KH550-AlOOH@GO/E51-BCE composites indicated that KH550-AlOOH@GO was uniformly dispersed in E51-BCE matrix and there was a good interaction between them, which was conducive to the performances of the composite material. Mechanical and dielectric properties of composite also were tested and analyzed. The highest bending strength, bending modulus, and impact strength of KH550-AlOOH@GO/E51-BCE composites were 158.23 MPa, 2.37 GPa, and 46.96 kJ/m 2 , respectively, when the content of KH550-AlOOH@GO was 0.6 wt%, which were 15.72%, 22.42%, and 198.22% higher than those of the matrix resin, respectively. The dielectric constant and dielectric loss of the composite were 3.12 and 0.0027 at 100 Hz.
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Polymers
·
2021
·Vol. 13
·期 13
·2072
·
IF 4.329
Xiaoyan Liu,Ruidan Liu,Tianyu Li,Yanqi Liu,Li Liu,Kai Lyu,Surendra P. Shah
Graphene is a two-dimensional sheet of regular hexagonal honeycomb lattice formed by sp2hybrid orbital bonding, with only one layer thickness of a single atom, which is known as the “super king” of the 21st century. Previous studies have shown that cerium oxide-graphene oxide (CeO2-GO(4:1)) nanocomposites eliminated the agglomeration of graphene to some extent and the CeO2-GO(4:1) epoxy coating could be prepared with good anti-corrosion performance. In this paper, CeO2-GO(4:1) nanocomposites were prepared by the hydrothermal synthesis method, and the three-electrode method was used for electrochemical tests. The state evolution of CeO2-GO(4:1)/EP coating and the synergy between CeO2-GO(4:1)/EP and corrosion inhibitor in simulated seawater solution with different concentrations (20%, 40%, 60%) were analyzed and illustrated by Optical Microscope (OM) characterization, Open Circuit Potential (OCP), Electrochemical alternating current Impedance Spectroscopy (EIS), Mott–Schottky curve and Tafel curve. The results indicated that CeO2-GO(4:1) nanocomposites showed good corrosion resistance in a marine environment. This research lays a solid theoretical foundation for the application of cerium oxide-modified graphene oxide anticorrosive coating in marine engineering.Keywords:CeO2-GO;corrosion inhibitor;simulated seawater;corrosion area
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SOLID STATE IONICS
·
2020
·
IF 3.107
Rui Li,Chang Miao,Limin Yu,Haoyi Mou,Mengqiao Zhang,Wei Xiao
Flower-like SnS 2 /NC@GO composite powders are successfully synthesized by freeze-drying a mixed suspension of graphene oxide (GO) and melamine decorating flower-like SnS 2 powders with following annealing processes , which are confirmed by scanning electron microscope , X-ray diffraction, transmission electron microscope, Raman spectra and thermogravimetric analysis . These results demonstrate that a three dimensional network provided by GO wraps uniformly on the surface of flower-like SnS 2 powders coated with the N-doped carbon (NC) layer derived from melamine, in which the NC layer can effectively relieve the volume expansion and the conductive network can supply plentiful charge transfer channels for electrons and lithium ions . When served as an anode material , the coin cell with the SnS 2 /NC@GO composite electrode exhibits an outstanding cyclic property and delivers an average discharge specific capacity of 761.5, 569.7, 502.6, 415.1 and 290.3 mAh g −1 at 100, 200, 300, 500 and 1000 mA g −1 , respectively. The cell can deliver a high discharge specific capacity of 621.1 mAh g −1 when the current density recovers suddenly to 100 mA g −1 . Moreover, the cell with the SnS 2 /NC@GO composite electrode presents an enhanced lithium ions diffusion coefficient of 1.872 × 10 −14 cm 2 s −1 and a low charge transfer resistance of 129.1 Ω. It is no doubt that the as-prepared SnS 2 /NC@GO composite with improved electrochemical properties can be used as a promising anode material for lithium-ion batteries.
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POLYMER ENGINEERING AND SCIENCE
·
2026
·
IF 3.6
Zhizhou Hao,Xiaoyuan Duan,Xinyu Wang,Haoyu Duan,Bosong Li,Yaqing Liu,Shuaishuai Cheng
Natural rubber (NR) exhibits excellent mechanical properties and processability, but its molecular structure is highly sensitive to thermo-oxidative environments. Particularly during the drying stage, radical-induced oxidation could promote thermo-oxidative degradation, leading to a significant decline in both green strength and the mechanical properties of vulcanized rubber. To address this issue, the effects of drying temperature (40°C–80°C) on the microstructure and green strength of natural rubber/graphene oxide (NR/GO) raw rubber were systematically investigated through experiments and molecular dynamics (MD) simulations. Subsequently, the mechanical properties of the corresponding natural rubber/graphene oxide/carbon black (NR/GO/CB) vulcanizates were evaluated to elucidate the relationship among the drying process, raw rubber structure, and vulcanization performance. The results indicated that lower drying temperatures (40°C) produced higher green strength in raw rubber (4.8 MPa). By better preserving structural stability and the effective chain-entanglement network, low-temperature drying favored strain-induced crystallization and more effective stress transfer during stretching, enhancing the tensile strength of the NR/GO/CB composites by approximately 8%. Furthermore, the better-preserved molecular and interfacial structure facilitated the formation of a more stable filler–rubber network, reducing heat build-up by approximately 40%. These combined effects collectively improved the mechanical properties of the NR/GO/CB composites. MD simulations further indicated that elevated temperatures increased oxygen mobility and NR-chain mobility, providing molecular-level trends consistent with the experimentally observed intensification of thermo-oxidative degradation. This study established a processing-structure–property framework and provided a feasible drying strategy for the industrial production of high-green-strength NR/GO/CB composites with improved mechanical performance. Highlights Elucidate the structural changes of raw rubber during the drying process. Establish the structure–property relationship of raw and vulcanized rubber. Regulate the green strength of NR/GO through the drying process.
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JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Bin Xiang,Jingling Gong,Yuqing Sun,Jian Li
The poor mechanical durability and weak fouling resistance of oil/water separation membranes severely restrict their applications in industry. Herein, a robust PVA/GO@MOF membrane with fast photothermal self-cleaning capability was developed through facile chemical crosslinking and suction-filtration strategies. Attributed to the powerful underwater superoleophobicity, the PVA/GO@MOF membrane exhibited extraordinary anti-oil adhesion even for high-viscosity crude oil and continuous crude oil emulsion purification capability with stable flux (1020 L m −2 h −1 bar −1 ) and exceptional efficiency (> 99.3%) even after 60 min. Most importantly, in comparison to reported photocatalytic self-cleaning oil/water separation membranes, the PVA/GO@MOF membrane can degrade organic contaminants more rapidly with a higher degradation rate (99.9%) in 50 min due to the superior photothermal conversion capacity. The synergistic photothermal and photocatalytic effects significantly enhanced photodegradation efficiency, which created opportunities for in-depth treatment of complex oily wastewater. Besides, the obtained membrane displayed excellent chemical and mechanical durability with underwater oil contact angle (UWOCA) above 150° even in harsh environments, such as corrosive solutions, UV irradiation, ultrasound treatment, abrasion experiment and bending test. Therefore, the developed PVA/GO@MOF membrane with robust durability and fast photocatalytic self-cleaning property is highly expected to purify oily wastewater and degrade organic pollutants .
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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 48
·22205-22214
·
IF 3.3
Song He,Chunxiang He,Xinyu Liu,Chunhua Du,Xin Jin,Qilin Chen,Ping Li
Flexible actuators are a kind of driving device that can convert one or more stimuli in the environment into mechanical motion, and are an important part of the field of smart materials and have been widely used in information technology, biosensors, intelligent robotics and other fields. However, designing a flexible actuator with fast response and multiple stimulus response characteristics is still challenging. In this study, based on the hydrophilicity of the GO layer and the high photothermal performance of the PDANP/PDMS layer, a bilayer flexible actuator (BFA) capable of simultaneously responding to stimuli such as light, heat, and humidity was prepared. Due to the asymmetric structure of the bilayer, the BFA exhibits different bending directions and angles under light, heat, and humidity stimuli with fast, reversible, and controllable bending deformation. In addition, based on this BFA with multiple responses, bionic devices, such as flexible grippers, smart curtains, and smart switches, have been designed to broaden their applications.
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ANALYTICAL CHEMISTRY
·
2023
·
IF 7.4
Jin Han,Xiangyu Wang,Wenxin Wang,Jianxiong Chen,Bin Xu,Zhenwei Wei
Direct analysis of micro-biopsy samples by mass spectrometry at single-cell level still faces major challenges. In this work, we developed a polarity gradient focusing dip-and-go strategy (PGF-Dip&Go) during induced electrospray ionization mass spectrometry (iESI-MS) analysis for real-time enrichment and spatial separation of compounds such as lipids, alkaloids, fatty amines, and drugs. Compared with direct iESI-MS analysis, enrichment of analytes (enrichment factor of 5.0–100.0) and spatial separation between different analytes were achieved. Owing to the enrichment effect and salt cleanup effect, the sensitivity of PGF-Dip&Go has been improved by 25–10,000 times compared with direct iESI-MS. PGF-Dip&Go has been successfully applied for the analysis of lipids in a 200 pL micro-biopsy section from an individual fish egg. Lysophosphatidylcholine (LPC), phosphatidylcholine (PC), and triglyceride (TG) were significantly enriched and separated according to their polarity differences, proving the potential of PGF-Dip&Go to be a noninvasive and powerful analytical tool for in situ analysis of complex small volumes in the future.
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