JOURNAL OF MATERIALS RESEARCH
·
2022
·Vol. 38
·期 2
·368-379
·
IF 2.909
Gao Jia,Zhang Yuan,Feng Wenjing,Zhang Ying,Cheng Cui,Han Xiao
Surface amino-rich GQDs-ε-PL is prepared by changing the addition amount of ε-PL. Then, GQDs-ε-PL@4-arm PEG-BA/QCS hydrogels (GQDs-ε-PL@Gel) are synthesized through dynamic imine bonds cross-linking. The sol can transform quickly to gel and the gelation time can be controlled by adjusting the specific gravity of the input raw materials to water. FT-IR and thermogravimetric analyses indicate the successful synthesis of GQDs-ε-PL and GQDs-ε-PL@Gel. The microstructure observation reveals that GQDs-ε-PL has a sheet-like structure with an average size of 65 nm, while GQDs-ε-PL@Gel has a porous network structure. Both GQDs-ε-PL and GQDs-ε-PL@Gel have good fluorescence stability, photothermal and cytocompatibility, and display better antibacterial effect against Escherichia coli , Staphylococcus aureus and Pseudomonas aeruginosa through chemical and photothermal synergistic sterilization. More importantly, GQDs-ε-PL@Gel can repeatedly self-heal after being damaged, which is more beneficial to provide an effective wound closure environment for wounds and to be used as wound dressings.
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AICHE JOURNAL
·
2023
·Vol. 70
·期 4
·e18346
·
IF 3.7
Yongzheng Wang,Siyu Liu,Jingjing Chen,Chongchong Chen,Xiaoli Wu,Zhirong Yang,Jie Zhang,Jingtao Wang
Two-dimensional (2D) nanochannels with confined spacing and tunable microenvironment exhibit broad application prospects in molecule-scale processes. However, mass transport behaviors in nanochannels have yet been clearly elucidated, due to the complex physical and chemical structures of nanochannels. Herein, a series of vertically-aligned nanochannels with tunable chemistry were fabricated by embedding graphene-based lamellar membranes into epoxy matrix. In this way, 2 mm-length robust nanochannels can maintain the molecular transport configuration throughout the membrane without the disturbance from entrance and cross-layer domains. Based on these platforms, it is demonstrated that molecule–channel and molecule–molecule interactions codetermine molecular transport efficiency by controlling molecular configuration and transfer friction. Significantly, matched interaction energies permit fast transport with methanol permeance of over 26.1 L m −2 h −1 bar −1 , which outperforms most reported long-range nanochannels, while mismatched interaction energies fail to do so. In addition, the vertically-aligned nanochannels membranes hold exceptional stability because of the mechanical protection of epoxy.
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Nano Research
·
2023
·
IF 9.9
Gu Zhenhua,Zhang Jingli,Zhang Zijun,Mu Qingxue,Yu Liangchong,Sun Taolei,Shen Lei,Gao Guanbin
The impact of interfacial charge on catalytic performance of supported-metal-cluster (SMC) heterostructures remains unclear, hindering efforts to develop high-performance SMC catalysts. Herein we systematically investigated interfacial charge effects of SMCs using a model system of graphene-supported gold-nanoclusters (AuNCs/rGO) for azo hydrogenation. Three types of SMCs with different interfacial charges were synthesized by anchoring electropositive 2-aminoethanethiol (CSH), amphoteric cysteine (Cys), and electronegative 3-mercaptopropionic-acid (MPA) onto AuNCs/rGO, respectively. All three SMCs exhibited high and selective catalytic activity to azo-hydrogenation in four representative azo dyes. The catalytic activity of Cys@AuNCs/rGO was lower than that of CSH@AuNCs/rGO but higher than that of MPA@AuNCs/rGO. However, the cyclic stability of Cys@AuNCs/rGO was inferior to that of both CSH@AuNCs/rGO and MPA@AuNCs/rGO. Further mechanistic studies revealed that amino ligands modified CSH@AuNCs and Cys@AuNCs agglomerated into large-size gold nanoparticles on rGO surface during catalytic reaction under NaBH 4 action, leading to reduced efficiency and cyclic stability. Conversely, non-amino ligand modified MPA@AuNCs only partially detached from rGO surface without agglomeration, resulting in better cyclic stability. Protection of amino groups in ligands such as modifying -NH 3 + group in Cys into imine to form N-isobutyryl-L-cysteine (NIBC) substantially improved the cyclic stability while maintaining the high activity in the NIBC@AuNCs/rGO catalyst system. Our work provides an approach for developing a highly-active and stable SMC heterostructure catalyst via manipulating interfacial charges in SMC.
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Biosensors-Basel
·
2023
·Vol. 13
·期 12
·1024
·
IF 5.4
Yanju Wu,Keyu Chen,Fei Wang
In this study, a composite film was developed for the electrochemical sensing of tryptophan (Trp). Porous reduced graphene oxide (PrGO) was utilized as the electron transfer layer, and a C-undecylcalix[4]resorcinarene Langmuir–Blodgett (CUCR-LB) film served as the molecular recognition layer. Atomic force microscopy (AFM), transmission electron microscopy (TEM), Raman spectroscopy, scanning electron microscopy (SEM), and electrochemical experiments were employed to analyze the characteristics of the CUCR-LB/PrGO composite film. The electrochemical behavior of Trp on the CUCR-LB/PrGO composite film was investigated, revealing a Trp linear response range of 1.0 × 10−7to 3.0 × 10−5mol L−1and a detection limit of 3.0 × 10−8mol L−1. Furthermore, the developed electroanalytical method successfully determined Trp content in an amino acid injection sample. This study not only introduces a rapid and reliable electrochemical method for the determination of Trp but also presents a new strategy for constructing high-performance electrochemical sensing platforms.Keywords:Langmuir–Blodgett film;porous reduced graphene oxide;calix[4]arene;electrochemical sensing;tryptophan
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Journal of Cleaner Production
·
2023
·
IF 11.1
Dan Zhou,Jianfei Sun,Mantong Xue,Qinqin Xu,Jianzhong Yin
Carbon dioxide (CO 2 ) has been recognized a renewable C1-level green chemical synthesis feedstock . Achieving 100 % atom utilization is possible through the cycloaddition reaction of CO 2 with epoxides . Ionic liquids are commonly used catalysts for this reaction, but conventional immobilization methods may lead to the loss of active components under severe conditions. Developing a new Ionic Liquid catalytic system offers a promising and eco-friendly approach to efficient CO 2 cycloaddition. In this study, imidazolium ionic liquid was chemically immobilized on graphene oxide (GO) to get a novelty catalyst GO-SmIm Br. The impact of catalyst dosage, temperature, pressure, and reaction time on the reaction performance of CO 2 and propylene oxide was systematically investigated in a batch reaction system, achieving a propylene carbonate yield of up to 90.4 % in the CO 2 cycloaddition reaction. Even after five cycles, the yield only decreased by 9.6 %, showcasing its robust catalytic activity . Further assessment in a fixed-bed reactor at 120 °C for 8 h demonstrated a continuous propylene carbonate yield of 55.6 %, highlighting the potential of GO-SmIm Br for efficient and sustainable CO 2 utilization.
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Science Bulletin
·
2023
·
IF 18.9
Lianmeng Si,Yihan Wu,Hong Xiao,Wensi Xing,Rui Song,Yiju Li,Sha Wang,Xu Liang,Wenshan Yu,Jianwei Song,Shengping Shen
Two-dimensional layered membranes with high and stable ion transport properties have various applications in nanofluidic devices; however, their construction remains a considerable challenge. Herein, we develop a superstable aramid nanofiber/graphite composite membrane with numerous one-dimensional and two-dimensional nano-confined interspaces for ultrafast ion transport. The fabricated flexible and scalable membrane exhibits high tensile strength (∼115.3 MPa) even after immersion in water for 90 days. Further, the aramid nanofiber/graphite conductor features the surface-charge-governed ion transport behavior. The ionic conductivity of the membrane at a low potassium chloride concentration of 10 −4 mol/L can be enhanced by 16 times that of the bulk counterpart. More importantly, its structure and ionic conductivity remain unchanged even after immersion in different harsh solutions (e.g., acid, base, and ethanol) for over 30 days. Molecular dynamics simulations reveal that the superstability of the membrane is attributable to the robust interchain interactions within the aramid nanofibers and the strong interfacial interactions between the aramid nanofibers and graphite nanosheets . This study highlights the superior structural stability of the proposed flexible and scalable aramid nanofiber/graphite composite membrane, which could be employed in advanced nanofluidic devices for application under extreme working environments.
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ACS Biomaterials Science & Engineering
·
2023
·
IF 5.8
Ying Zhou,Min Tian,Ruichun Li,Yan Zhang,Guomei Zhang,Caihong Zhang,Shaomin Shuang
An electrochemical sensor applied for dopamine (DA) detection was constructed. An easy static way was used to synthesize bimetallic CoNi-MOF. Next, it was mixed with graphene oxide (GO) under ultrasound to get a uniform suspension. Subsequently, the solution was coated on the glassy carbon electrode (GCE) to form CoNi-MOF@ERGO/GCE by the electrochemical reduction method. The interaction between CoNi-MOF and electrochemically reduced graphene oxide (ERGO) enhances the electrocatalytic performance for DA detection. CoNi-MOF@ERGO/GCE has a wider linear range (0.1–400 μM) and a lower detection limit (0.086 μM) under optimum conditions. Furthermore, it has been applied to test DA in human serum samples. The results reveal that the DA sensor shows excellent performance, which will provide a novel idea for more sensitive and quicker DA detection.
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Micromachines
·
2023
·Vol. 14
·期 9
·1718
·
IF 3.4
Yu Liu,Zhaorui Wen,Ziyu Huang,Yuxin Wang,Zhiren Chen,Shen Lai,Shi Chen,Yinning Zhou
Liquid phase exfoliation (LPE) has emerged as a promising method for the industrial-scale production of graphene. However, one of its critical steps, namely sonication, has faced challenges due to high power consumption and low efficiency, leading to limited applicability in industrial settings. This study introduces a novel, cost-effective microfluidic sonication device designed to significantly reduce power consumption while efficiently assisting the LPE process for graphene production. By coupling a capillary with a buzzer and applying an appropriate electric signal, simulation and particle tracing experiments reveal the generation of robust shear forces resulting from acoustic streaming and cavitation when the capillary end is immersed in the liquid. For the first time, the capillary-based sonication device was effectively utilized for graphene exfoliation in a DMF (N,N-Dimethylformamide) + NaOH liquid phase system. The SEM (Scanning Electron Microscope) and Raman characterization results corroborate the successful exfoliation of 100 nm with thicknesses below 10 nm graphene sheets from graphite flakes using this pioneering device. The values ofI2D/IGincrease after processing, which suggests the exfoliation of graphite flakes into thinner graphene sheets. The vibration-based acoustofluidic effector represents a versatile and scalable miniature device, capable of being employed individually for small-batch production, thereby optimizing the utilization of raw 2D materials, particularly in experimental scenarios. Alternatively, it holds the potential for large-scale manufacturing through extensive parallelization, offering distinct advantages in terms of cost-efficiency and minimal power consumption.Keywords:liquid phase exfoliation;graphene;capillary sonication;acoustic streaming;cavitation
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Yanting Li,Shu Zhu,Hua Zhao,Yan Xiong,Tao Gong,Yanru Tao,Jin Li,Jiangling Hu,Hongmei Wang,Xinhui Jiang
Recently, the endocrine interference of endocrine disruptors on the environment and aquatic organisms has been a hot topic. Ethinyl estradiol (EE2) is an estrogen endocrine disruptor and one of the most widely used ingredients in oral contraceptives, resulting in high emissions and environmental pollution . Therefore, it is urgent to construct a non-enzymic, simple and low-cost sensor to detect EE2 in environmental and biological samples. We successfully prepared cobalt ferric oxide with anti-spinel structure and reduced graphene oxide composite (CoFe 2 O 4 /RGO) using hydrothermal synthesis, which decorated on the glass carbon electrode (GCE) to detect EE2. The morphological structure of CoFe 2 O 4 /RGO composites was studied by FESEM, HRTEM, EDX, FT-IR, XRD, and XPS techniques. Additionally, the experimental conditions were optimized and the oxidation mechanism of EE2 was explained theoretically and EE2 was detected by CV, EIS, and SWV, which displayed a fantastic current response of EE2. The electrochemical results illustrated that the prepared sensor has good selectivity , high sensitivity, a wide linear range of 0.05–100 μM, and a lower detection limit of 42 nM. Finally, the practicability of the sensor to detect EE2 in real samples was also studied and obtained a satisfactory recovery.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Yanting Dou,Zhiman Liang,Zhenhe Xu,Yuanjin Wang,Jiqi Zheng,Dongling Ma,Yu Gao
Photocatalysis is considered a promising technology to alleviate the energy crisis and environmental pollution; however, developing photocatalysts with improved light absorption efficiency is still a challenge. In this work, an effective strategy was proposed to synthesize a highly functional ternary nanocomposite (g-C3N4/RGO/AZIS) by coupling broader light-absorbing Ag-doped ZnIn2S4 (AZIS) nanoplates with ultrathin g-C3N4 and reduced graphene oxide (RGO) nanosheets. The 2D-on-2D stacking nanostructure of the composite provides a compact heterojunction, enlarged interfaces, and enriched active sites, resulting in the accelerated separation and relocation kinetics of charge carriers. Benefiting from these advantages, the g-C3N4/RGO/AZIS nanocomposite with systematically optimized contents of RGO and AZIS can serve as an efficient bifunctional photocatalyst for both H2 production from water splitting and methyl orange (MO) photodegradation under the irradiation of visible light. The H2 production rate of the ternary nanocomposite is 658.5 μmol h–1 g–1, which is 38 times higher than that of plain g-C3N4. The operation mechanism is proposed based on the results of scavenger tests and photoelectrochemical analysis. The formation of a type-II heterostructure between AZIS nanoplates and g-C3N4 nanosheets along with RGO with lower potential can maximize the separation efficiency of photogenerated electron–hole pairs and decrease the charge recombination. This work provides a viable strategy to develop bifunctional photocatalysts with enhanced performance for both H2 production and degradation of organic dyes.
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Journal of Cleaner Production
·
2023
·
IF 11.1
Zhiqiang Shan,Xiaohua Jia,Yunfei Bai,Jin Yang,Yunfeng Su,Haojie Song
Conventional paper-based wear-resistant materials employ thermosetting resin as the matrix, which are difficult to recycle, degrade, and reuse after scrapping, causing significant damage to the environment. The discovery of sustainable alternatives has the potential to transform the manufacture of paper-based wear-resistant materials into low-carbon production. Herein, inspired by spider webs sticking to insects, a paper-based self-lubricating material based on lignin-cellulose-graphene layered interwoven structure was prepared by lignin-cellulose assisted in-situ exfoliation of flake graphite strategy. Graphene adheres to the interlaced cellulose network, while lignin serves as a natural binder and matrix, resulting in a 2D interwoven structure. The paper-based film had a 37.4% greater average mechanical strength than pure lignin-cellulose film and a 56% lower toughness loss following heat treatment. The friction coefficient of the film-15% was 173.3% lower than that of the film-10%, and it maintained long-term stability with a low wear rate of 3.9 × 10 −3 mm 3 /(N·m). Furthermore, the end-of-life products were recycled five times and can be degraded by microorganisms in moist soil within 40 days. The degradation products can provide nutrients for plant growth, indicating that it is a potential alternative to non-recyclable wear-resistant materials for light-duty transmission machinery.
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CARBON
·
2023
·
IF 10.9
Xia Wang,Wenchang Zhang,Kun Ni,Fei Pan,Yanwu Zhu
It is well known that alkali metals can intercalate into graphite to form graphite intercalation compounds but the structural change of graphite induced by alkali metals has been paid less attention. Herein, we report that alkali metals (Li, Na, K) induce the phase transition from ABC-stacking (or 3R phase) to AB-stacking (or 2H phase) of graphite. Specifically, for the graphite powder containing ∼45% 3R phase in a mixed phase, the temperature needed to ensure a complete stacking phase transition is 600 °C, 500 °C or 350 °C, for Li, Na or K, respectively, much lower than that needed in bare annealing (1800 °C) while without these alkali metals. Simulations based on density functional theory (DFT) suggest that the charge transfer from alkali metals to graphene distinctly lowers the energy barrier of transition, explaining the different phase transition temperatures for these alkali metals.
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