COMPOSITES COMMUNICATIONS
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2024
·
IF 6.5
Liangliang Cao,Binbin Li,Luwei Shao,Qianli Liu,Jingmin Gao,Shuaichao Yuan,Hengchang Bu,Xiaohong Zhan
Polyimide (PI) foam exhibits excellent high-temperature resistance and outstanding physical and chemical stability, making it an ideal matrix for absorbing materials. However, the growing demand for absorbing materials that can serve as load-bearing components has revealed that existing polyimide composite foams often fall short of practical application requirements due to their low mechanical properties. The study employed a simple foaming method using isocyanate-based polyimide as the foam base under a 0.2 MPa atm. Multi-walled carbon nanotubes (MWCNTs) and carbonyl iron (CI) powder were added sequentially to the precursor solution. Under the filling parameters of 2.0 % MWCNTs and 10 % CI powder, the compressive strength of polyimide composite foam reaches 16.2 MPa and exhibits excellent microwave absorption properties, with a minimum reflection loss (RL min ) of −62.51 dB and an effective absorption bandwidth (EAB) of 7.86 GHz. Additionally, the prepared composite foam has potential infrared stealth capability. This work offers new insights for rapid and low-cost manufacturing of high-strength absorbing foam.
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Analytical Methods
·
2024
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IF 2.7
Zhiren Zhou,Yuting Tian,Lina Zou,Yanan Liu,Xueqing Zhang,Xiaojing Huang,Huanyu Ren,Zheng Li,Huiru Niu,Hao Liao,Xiaojing Zhang,Hongzhi Pan,Shengzhong Rong,Hongkun Ma
Nuclear matrix protein 22 (NMP22) is one of the most important tumor markers of bladder cancer and is significantly elevated in the urine of bladder cancer patients. Therefore, in this work, a highly sensitive ratiometric electrochemical immunosensor was constructed to detect NMP22 based on ZIF-8@MWCNTs@Chit@Fc@AuNPs composites. ZIF-8 had a large surface area and good adsorption ability. Multi-Walled Carbon Nanotubes (MWCNTs) can optimize the electrical conductivity of ZIF-8, so that the electrode surface of ferrocene (Fc) obtains a stable and strong electrochemical signal. In addition, AuPt-MB provided another strong detection signal methylene blue (MB) while immobilizing the secondary antibody (Ab2) through Au–N and Pt–N bonds. A ratiometric electrochemical sensor was formed based on ZIF-8@MWCNTs@Chit@Fc@AuNPs and AuPt-MB, which showed a great linear connection between IMB/IFc and the logarithmic concentration of NMP22 with a detection limit of 3.33 fg mL−1 (S/N = 3) under optimized specifications in the concentration interval of 0.01 pg mL−1 to 1000 ng mL−1. In addition, the ratiometric immunosensor showed good selectivity and stability.
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MICROCHIMICA ACTA
·
2024
·Vol. 192
·期 1
·1-13
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IF 5.3
Liu Junjie,Wu Shengxi,Zhang Lu,Zhang Mingjun,Wu Haotian,Shi Miwan,Weng Yuan,Ye Wenqiao,Gu Kui
A novel proposal is introduced with an unlabeled electrochemical immunosensor for the detection of tumor broad-spectrum biomarker vascular endothelial growth factor (VEGF165) Copper-based metal organic frameworks (Cu MOFs)-carbon nanotubes (MWCNTs) were employed as its substrates, functionalized with methylene blue (MB) for signal enhancement. Cu-MOFs-MWCNTs nanocomposites were synthesized successfully via a solvothermal method and were then deposited on the surface of a glassy carbon electrode (GCE), with the addition of methylene blue to amplify the signal. Due to the expansive specific surface area provided by the carbon nanotubes and the amino groups facilitated by the metal–organic framework nanomaterials, the anti-VEGF165 monoclonal antibody was immobilized on the electrochemical immunosensor through covalent bonding, which could bind specifically to VEGF165, thereby causing a detectable change in the current. The developed immunosensor exhibited a linear detection range for VEGF165 spanning from 1 to 100,000 pg/ml, with the R 2 value of 0.997 by differential pulse voltammetry (DPV) method, and the limit of detection was as low as 0.9686. Additionally, the electrochemical immunosensor presented commendable selectivity, availability, and reproducibility, along with an effective capacity for detecting VEGF165 in clinical samples. Consequently, the immunosensor is expected to revolutionize early screening for VEGF165-related diseases, which offer a promising, cost-effective, and precise diagnostic tool for clinical utility. Graphical
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TALANTA
·
2025
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IF 6.1
Qian Wang,Maoyuan Hu,Xiangwei Yuan,Xiaoli Xiong,Zhaoyu Jin
Hydroquinone (HQ), catechol (CC), and resorcinol (RS), as toxic and hardly degradable dihydroxybenzene isomers, pose threats to the environment and human health. In this study, using multi - walled carbon nanotubes (MWCNTs) and ZIF-8 as precursors, a necklace-like N-doped carbon polyhedron/carbon nanotube composite loaded with Cu nanoparticle (Cu NPs/NC@MWCNTs) electrocatalyst was prepared by hydrothermal and high-temperature carbonization processes. Comprehensive characterization data from XRD, SEM, TEM, XPS, BET, and Raman spectroscopy confirmed that the unique necklace-like porous structure and synergistic effect between ZIF-derived N-doped carbon polyhedra and MWCNTs regulate the electronic structure and surface properties of the catalyst, thereby accelerating the electron transfer rate. Under neutral conditions, the Cu NPs/NC@MWCNTs/CP electrode exhibits good electrocatalytic activity for the separate or simultaneous determination of three dihydroxybenzene isomers (HQ, CC, and RS) with low detection limit of 0.16 μM, 0.14 μM and 0.10 μM (S/N = 3), respectively. Density functional theory (DFT) calculations further reveal the differences in selectivity and sensitivity among the three isomers. In addition, this sensor has been successfully applied to the detection of three dihydroxybenzene isomers in actual environmental water samples, achieving satisfactory recovery rates of 97.8–106 %.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Zhihua Zhao,Shuhan Chen,Qingsheng Shi,Chao Qiu,Lan Wu,Xinhao Zhang,Peijuan Wu,Longqi Yao
People pay more and more attention to their own health and environmental safety, which makes the monitoring and treatment of harmful amines such as triethylamine (TEA) emitted in the industrial process increasingly critical. In order to address this issue, we focus on the heterostructure construction of two-dimensional rhenium disulfide (ReS 2 ) and acid-functionalized carbon nanotubes (f-MWCNTs), using their unique electronic properties and high specific surface area for triethylamine gas detection. The findings demonstrated that, at room temperature (25°C), the ReS 2 /f-MWCNTs sensor's response to 100 ppm TEA reached 63 %. Under the same environmental conditions (25℃), the response value of the ReS 2 sensor to 100 ppm TEA is 6 %, and the sensing performance is improved by more than 10 times. In addition, the sensor has fast response recovery (73 s/46 s) and good repeatability and stability. Based on this research, we designed a simple detection device, providing a direction for the practical detection application of TEA sensors.
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PROGRESS IN ORGANIC COATINGS
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2024
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IF 6.5
Qian Chen,Xixun Shen,Zuogui Zhang,Qunjie Xu
To solve the problem of icing on the wind turbine blades, here an anti-icing coating composed of PDMS and PVDF as organic bonding frameworks, GPE, MWCNTs , and modified SiO 2 nanoparticles as functional doping phases is synthesized through a one-step spraying method. The coating exhibits excellent superhydrophobic properties with a large contact angle of about 167.0° and a low sliding angle of4.0° and excellent photothermal and electrothermal properties. Under light and electric heating conditions, the coating can be rapidly heated to a high temperature level of about 68.4 °C at 81 s and 48.5 °C at <61 s, respectively. The static water droplet icing experiment shows that the coating can effectively delay the freezing time and reduce the adhesion strength of ice. The freezing rain experiment further showed that under the coordination of photothermal and electrothermal, freezing rain droplets will not freeze on the coating, indicating an excellent anti-icing ability. Meanwhile, the coating also exhibits a superior de-icing ability under the coordination of photothermal and electrothermal. In addition, various performance experiments, including acid and alkali immersion, friction and wear, and impact experiment are also performed to demonstrate the excellent stability and durability of the coating.
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ELECTROCHEMISTRY
·
2025
·
IF 1.7
Jin LI,Siyuan HAN,Yue CUI,Tong XING,Tingting ZHENG,Jing YANG,Yu FU,Jie LIAN,Fangyuan ZHAO,Weining ZHAO
Piroxicam is a common painkiller and anti-inflammatory drug. Precise monitoring of piroxicam levels can mitigate side effects, but current methods are often slow and complicated. An easily fabricated and highly sensitive voltammetric sensor for piroxicam was developed by drop-coating a composite of multi-walled carbon nanotubes (MWCNTs) and Nafion onto the electrode surface. The morphological and electrochemical characteristics of the Nafion-MWCNTs composite film were analyzed to reveal the synergistic effects of Nafion and MWCNTs. The composite film was then applied to modify a glassy carbon electrode (GCE), which served as a voltammetric sensor for the detection of piroxicam. When compared to previous reports, the sensor demonstrated efficient electrochemical oxidation of piroxicam with remarkable sensitivity, reproducibility, and stability. Under optimized conditions, the Nafion/MWCNTs/GCE exhibited a linear voltammetric response for piroxicam in the concentration range of 5 × 10−9 to 8 × 10−6 mol L−1 and 8 × 10−6 to 6 × 10−5 mol L−1 respectively, with a detection limit of 4 × 10−9 mol L−1. The sensor was successfully applied to detect piroxicam in real tablet samples, providing satisfactory recovery values. Furthermore, the composite film was applied to the surface of a platinum microelectrode, resulting in a micro-sensor for piroxicam detection. With the typical small size and the radial diffusion field, the micro-sensor of piroxicam exhibited increased sensitivity and possessed unique properties. Particularly, fast and accurate response across various piroxicam concentrations was achieved without the necessity of additional forced-convection for preconcentration, demonstrating its great potential for in vivo determination of piroxicam.
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JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2025
·Vol. 150
·期 15
·11907-11923
·
IF 3.1
Mumtaz Nighat,Li Yanchun,Artiaga Ramón,Guo Qian,Mumtaz Amina
This work shows how the rate parameter of the proposed kinetic model is highly suitable for adequately comparing the temperature-dependent thermal stability behavior of different compounds. This means that a simple plot of the rate parameter versus temperature for polymers containing fillers of different natures or in different concentrations allows for establishing the temperature ranges in which each filler is more efficient in improving thermal stability. Since linear low-density polyethylene (LLDPE) is used in a wide range of applications, its thermal degradation is a crucial aspect to consider for its optimal use. This work examines the effect of magnesium hydroxide (MH) and multi-walled carbon nanotubes (MWCNTs) on the thermal degradation of LLDPE in a non-oxidizing atmosphere using isothermal data. Experimental data were obtained by thermogravimetry (TGA) in a nitrogen atmosphere at different temperatures. A kinetic study was performed using a model-fitting method based on logistic derivative functions. The method consists of initially fitting the experimental mass loss rate curves using nonlinear methods with logistic derivative functions. One of the fitting parameters represents the degradation rate. The kinetic significance is primarily described by the dependence of the rate parameter, used in the fittings, on the temperature. That dependence can be expressed in two equivalent ways: either by a characteristic time and temperature, or by the parameters of the classical Arrhenius equation—activation energy and pre-exponential factor. Ultimately, by comparing the kinetics of LLDPE and its composites, it was possible to establish the stabilizing effect of the fillers as a function of temperature. More importantly, this methodology provides a very clear and direct way to compare how the stabilizing effects of fillers of different natures and at different ratios vary across temperature ranges. The observed temperature-dependent stabilization effects in LLDPE composites underscore the critical need for precise filler selection tailored to specific operational temperature ranges, offering vital design guidelines for enhanced thermal management in practical applications.
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CHEMICAL ENGINEERING JOURNAL
·
2021
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IF 13.273
Peng Song,Chunyan Xi,S. Premlatha,Xiaoping Shen,Zhenyuan Ji,Zhenyu Yan,Aihua Yuan,Lirong Kong,Guoxing Zhu
Fiber-shaped supercapacitors (FSSCs) have attracted increasing attention for wearable electronics. Herein, an asymmetrical fiber-shaped supercapacitor, AFSSCs-ICS, with an innovative encapsulated core-sheath architecture has been successfully constructed for the first time. The sword-scabbard inspired AFSSCs-ICS was fabricated by simply inserting a ‘sword’ positive electrode, PPy-MWCNTs-silk, into one tubular graphene ‘scabbard’ negative electrode with H 2 SO 4 /PVA gel as electrolyte. Notably, our newly designed PPy-MWCNTs-silk electrode had an ultrahigh length specific capacitance of 15.3 mF cm −1 (corresponding to high areal or volumetric capacitance of 676.9 mF cm −2 or 376.3 F cm −3 ), representing one of the highest levels among the fabric yarn derived electrodes, while the hollow graphene tube depicted a superior linear capacitance of 19.1 mF cm −1 , which could match well with that of the PPy-MWCNTs-silk electrode. Benefiting from the innovative yet rational structure, and ideally balanced charges, the AFSSCs-ICS had an extended operating potential of 1.6 V, and an outstanding length specific capacitance of 2.3 mF cm −1 with a very admirable energy density of 0.8 μWh cm −1 , dramatically surpassing numerous reported FSSCs. Moreover, the AFSSCs-ICS device also afforded superb electrochemical and mechanical stabilities with retentions of 81% after 3000 charging-discharging cycles and 95–105% under bending degrees from 0 to 150°. This study may pave a new way for constructing coaxial fiber-shaped energy source unit for next-generation wearable and portable miniaturized electronics.
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JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2026
·
IF 5.3
Zhixuan Zou,Xuemei He,Dan Hou,Tingting Sun,Minxi Li,Xiaoning Liao
Fabricated a HrGO/MWCNTs-based electrochemical sensor for sensitive FT detection. • Enhancing electrocatalytic activity via synergistic effect between HrGO and MWCNTs. • Exhibiting good reproducibility, strong anti-interference and excellent stability. • The sensor shows a wide linear range (0.008–10.0 μM) and an ultralow LOD (6.6 nM). Sensitive and reliable detection of fenitrothion (FT) is still a challenge owing to its poor intrinsic electrochemical activity and the lack of stable advanced functional material. Herein, a novel electrochemical sensor was successfully fabricated using holey reduced graphene oxide/multi-walled carbon nanotube (HrGO/MWCNTs) nanocomposites as the functional modification material. The synergistic effect between HrGO and MWCNTs efficiently enhances electrocatalytic response and stability to the reduction of FT. The developed sensor achieves sensitive FT detection over two linear range of 0.008–1.0 μM and 1.0–10.0 μM, with a low limit of detection of 6.6 nM. The sensor also presents favorable reproducibility, high anti-interference performance, and excellent long-term stability. Moreover, the proposed method was successfully utilized for the determination of FT residue in commercial white, green, and black tea powder samples, with recoveries ranging from 90.93% to 100.9% and relative standard deviation (RSD) values of 0.5–4.8%. Its accuracy is in good agreement with that of conventional high-performance liquid chromatography, confirming that this sensing platform holds great promise for practical FT residue analysis.
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ANALYTICA CHIMICA ACTA
·
2026
·
IF 6.1
Nanke Ma,Anqi Wei,Huiling Peng,Lixia Xie,Yuan Jin,Zhengzhi Yin,Guangli Li
Background Chirality plays a critical role in drug efficacy and environmental safety. The antibacterial activity of ofloxacin resides almost exclusively in its S-enantiomer (levofloxacin, LEV), while the R-enantiomer contributes little to therapeutic effects but may pose unnecessary risks. Rapid and reliable methods for enantioselective determination of ofloxacin enantiomers are therefore essential for pharmaceutical quality control, food safety monitoring, and environmental analysis. However, existing electrochemical sensors often suffer from limited enantioselectivity and insufficient sensitivity. To address this challenge, a novel enantioselective electrochemical platform is developed. Results A β-cyclodextrin/cerium-doped copper metal-organic framework/carboxylated multi-walled carbon nanotube composite (β-CD/Ce-doped Cu-MOF/MWCNTs-COOH) was fabricated on a glassy carbon electrode. The sensor achieves discrimination of ofloxacin enantiomers with an I L /I D ratio of 3.39. DFT calculations at pH 4.0 reveal that β-CD binds LEV with higher adsorption energy (−63.8 kJ/mol) than DEX (−58.3 kJ/mol), confirming the superior response for LEV originates from stereospecific inclusion. Quantitative analysis of LEV shows two linear ranges (0.03–1 μM and 1–10 μM) with a low detection limit of 0.01 μM. The sensor also enables accurate determination of LEV percentage in enantiomer mixtures across 0–100%. Excellent selectivity against common interferents, good reproducibility (RSD = 0.98%), repeatability (RSD = 1.26%), and long-term stability (95.2% retention after 21 days) are demonstrated. Practical applicability is validated by detecting LEV in commercial eye drops, honey, and tap water with satisfactory recoveries (96.0–108.0%). Significance and novelty This work presents the first application of Ce-doped Cu-MOF/β-CD/MWCNTs-COOH composites for the enantioselective electrochemical sensing of ofloxacin, a chiral fluoroquinolone antibiotic. The synergistic combination of high conductivity, abundant catalytic sites, and stereospecific host-guest recognition provides a generalizable strategy for high-performance enantioselective sensing, with promising applications in pharmaceutical, food, and environmental analysis.
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MICROCHEMICAL JOURNAL
·
2026
·
IF 5.2
Ziyao Mu,Peiran Sun,Pengsheng Chen,Qing Zhou,Haiyun Zhai
A sensor based on UiO-66@MWCNTs, AuNPs, and ABSA was constructed for methyl parathion detection. • UiO-66@MWCNTs provides abundant Zr OH sites for MP adsorption and preconcentration. • The sensor exhibits a wide linear range (0.1–15 μg·mL −1 ). • Satisfactory recoveries (97.43%–101.5%) were obtained in traditional Chinese herbs. A non-enzymatic electrochemical sensor for methyl parathion (MP) was developed based on UiO-66@MWCNTs/AuNPs/ABSA composites. These composites were synthesized via a solvothermal route, followed by AuNPs electrodeposition and ABSA electropolymerization. The UiO-66@MWCNTs matrix offers a large surface area and abundant binding sites for organophosphorus groups, enhancing MP adsorption and preconcentration. AuNPs effectively boost conductivity and catalytic activity, while the electropolymerized ABSA further facilitates electron transfer due to its excellent electrocatalytic properties. Thus, the composite displays remarkable electrocatalytic activity toward MP. Using the MP reduction peak current, the sensor achieves a linear range of 0.1–15 μg·mL −1 and a detection limit of 0.0152 μg·mL −1 (S/N = 3). It also exhibits good selectivity, satisfactory reproducibility (RSD 1.93%), excellent repeatability (RSD 1.50%), long-term stability (99.96% retention after 15 days), and successful application in traditional Chinese herbs such as Coptis chinensis French. and Citri Reticulatae Pericarpium .
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危险品化学品经营许可证（带存储）