Materials Today Physics
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2025
·
IF 9.7
Guodong Han,Fangyuan Qi,Song Zhao,Yuxiang Jia,Yudeng Wang,Sai Sui,Bo Feng,Jun Wang,Jiafu Wang,Shaobo Qu
The lightweight microwave absorbing materials(MAMs) have always been a research hot topics in the field of electromagnetic waves(EMWs) absorption. In this work, the pineapple peel (PA) was used as a carbon source and combined with Co alloys. The hollow porous carbon of the PA after pyrolysis provides advantage for becoming the lightweight MAMs. When the soaking time of PA-800 in the solution of CoCl 2 •6H 2 O achieves at 60 h, PA-800-60 was successfully prepared which the RL min of −24.8 dB and the EAB reach 5.8 GHz (12.2–18 GHz) at the thickness of only 1.3 mm. In order to improve the effects of impedance matching, the height of 9 mm frustum metastructure based on PA-800-60 was designed and used for improving microwave absorption in the low-frequency range. The EAB has been expanded from 5.8 GHz to 13.5 GHz (3.5–18 GHz) which covers the C, X and Ku band and the RL min reached −17.5 dB at the frequency of 7.44 GHz. Meanwhile, the RCS value of PA-800-60 layer is less than −10 dB m 2 cover the range of −60°–60° and the maximum scattering intensity is only −10 dB m 2 at the thickness of 2 mm. In addition to, the PA-800-60 exhibits superb thermal insulation performance due to abundant air with lower thermal conductivity take place of solid phase with higher thermal conductivity. This work provides a new direction for the research and development of multifunctional electromagnetic metastructures based on the lightweight MAMs.
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APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Huanhuan Wang,Qi Qu,Qingbin Tian,Jin Wang,Jiming Gao,Yufeng Liu,Yan He,Jun Yang
The dispersion of carbon nanotubes (CNTs) remains a critical challenge for their application in nanocomposites and advanced functional materials. This study proposes a systematic surface modification strategy involving sequential acid oxidation, reduction, and silane coupling agent (SCA) grafting to enhance CNT dispersibility. The effects of oxidation time, reduction time, and SCA concentration on CNT surface chemistry, structure, and dispersion were comprehensively evaluated using XPS, FTIR, Raman, and TGA. Results indicated that an optimal oxidation time of 8 h maximized the introduction of oxygen-containing functional groups while maintaining CNT structural stability, whereas a 5 h reduction time effectively converted carbonyl and carboxyl groups (−C O, –COOH) into hydroxyl (–CH 2 OH), enhancing reactivity for subsequent functionalization. A grafting concentration of 5 wt% SCA achieved effective surface coverage and dispersion. The resulting functionalized CNTs exhibited superior dispersion stability in polar solvents, confirmed by SEM, sedimentation, contact angle, and zeta potential analyses. Improved surface polarity, electrostatic repulsion, and steric hindrance were identified as key contributors. This work provides a comprehensive approach to CNT surface modification, offering valuable insights into tailoring CNT dispersibility for improved interfacial compatibility in polymer nanocomposites, coatings, and functional materials.
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MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 7
·1-14
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IF 5.3
Huang Wei,Ren Zhen,Li Xukui,Chen Rong,Fan Dinglin,Da Jingjing,Zha Yan,Xu Yongjie
The use of ultrasmall high-entropy alloys (HEAs, ≈5 nm) with unique catalytic properties, integrating them into lateral flow immunoassay (LFIA) for the detection of Staphylococcus aureus is proposed. Under optimal conditions, the detection limits of the HEAs-based LFIA were 1.5 × 10 3 CFU/mL via direct coloration and 15 CFU/mL using the DAB-enhanced catalytic signal, representing improvements of 10 3 -fold and 10 5 -fold, respectively. The HEAs demonstrated superior performance compared with traditional AuNPs, including enhanced sensitivity and high peroxidase activity (Km = 0.066 M, Vmax = 1.132 × 10 –6 M min −1 ), as well as excellent specificity and repeatability, with relative standard deviation (RSD) of less than 10%. Moreover, the incubation time for HEAs functionalized with antibodies to bind Staphylococcus aureus was only 5 min, compared with 20 min for functionalized AuNPs. The method also showed high specificity, effectively discriminating Staphylococcus aureus from other foodborne pathogens. The HEAs-based LFIA was successfully applied to food sample analysis, including milk and orange juice, demonstrating its robust applicability for real-world detection scenarios. This approach not only lowered the detection limit but also reduced the total detection time, making it a highly promising candidate for on-site detection of Staphylococcus aureus and other foodborne pathogens by simply changing the recognition element. Graphical
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PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2025
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IF 5.2
Na Xue,Yunpeng Zhang,Zongxu Li,Yangge Zhu,Xuejing Liu,Hao Wang,Yimiao Nie,Long Wang
Fluorite commonly coexists with calcite, whilst the separation of these two minerals is a longstanding challenge due to their closely similar surface properties. In this work, froth flotation was adopted to remove calcite from fluorite with tara gum (TG) innovatively performed as the calcite depressant. Flotation experiment results showed that TG exhibited strong depression performance for calcite in a broad pH range (6–8) in sodium oleate (NaOL) system. Zeta potential results confirmed that TG trended to selectively react on the calcite and prevented the function of NaOL onto calcite surface. X-ray photoelectron spectroscopy (XPS) measurement found that TG chemisorbed onto calcite, while physically adsorbed on the fluorite. Atomic force microscopy (AFM) tests indicated that TG densely adhered onto calcite surface and greatly enhanced its hydrophilicity, whereas it adsorbed weakly on the fluorite surface. Molecular dynamics (MD) simulations further concluded that TG could abundantly adhere to the calcite surface with higher intensity and capacity. Therefore, TG exhibited effective depression impact on calcite and achieved the separation of fluorite from calcite successfully.
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CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Yan Li,Yongcai Tian,Yuyao Zhong,Xiangrui Zeng,Wenqian Zhao,Longxiang Zhang,Haoyuan Song,Yuwei Liang,Ming Yan,Shiji Jiang,Jun Xie
This study reports the green synthesis of ammonium polyphosphate-grafted lignin (APP@Lig) without organic solvents. The synthesis employed ammonium dihydrogen phosphate, urea, and phosphoric acid through nucleophilic substitution and polycondensation. Piperazine pyrophosphate (PAPP) and APP@Lig were mixed at a 3:1 mass ratio and added to a high-density polyethylene (HDPE)/polyolefin elastomer (POE) composite system (PEPO) as flame retardants. With 30 wt% total flame retardant content, the composite achieved a UL-94 V-0 rating and a limiting oxygen index (LOI) of 28.9 %. Cone calorimetry confirmed that the addition of APP@Lig reduced heat release significantly. Compared with pure PEPO, the composite showed 36.3 % lower total heat release (THR) and 82.9 % lower peak heat release rate (pHRR). The peak CO₂ release rate also decreased by 0.4 g·s⁻¹ . In addition, the fire performance index (FPI) increased by 76.5 % compared with the system containing only 30 % PAPP, indicating improved fire safety. The composite showed excellent UV resistance (UPF 44.31) due to lignin’s aromatic structures and phenolic hydroxyl groups. Overall, this work introduces a practical strategy for combining inorganic and bio-based flame retardants to enhance both flame retardancy and weather resistance in HDPE-based composites.
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LANGMUIR
·
2025
·
IF 3.9
Jijun Ding,Pengfei Zhao,Haixia Chen
Flexible pressure sensors have broad prospects in smart wearables, healthcare, and human-computer interaction. Nevertheless, flexible pressure sensors still face numerous thorny challenges. It has become a crucial problem to skillfully design and successfully achieve flexible pressure sensors with both a high sensing range and ultrahigh sensitivity. The sensor is designed and realized with inspiration drawn from the layered microstructure of human skin, and hierarchical structure flexible pressure sensors are fabricated, where PDMS microstructures/MWCNTs act as the top electrode, filter paper/ZnO nanostructures/MWCNTs act as the intermediate active layer, and an Ag interdigitated electrode acts as the bottom electrode. The sensing performance of the sensor is investigated to develop the application of pressure sensors for human health detection in daily life, and a pressure sensor array is prepared to investigate the detection of spatial pressure distribution. Sensors based on paper and PDMS can achieve low-pressure detection (30 Pa), high sensitivity (261.38 kPa–1), fast response time (∼73.8 ms), and excellent cyclic stability (10 000 cycles). Finally, the sensor demonstrates its functionality by lighting up a small lamp, which confirms that the as-prepared pressure sensor has excellent application scenarios and is beneficial for the development of flexible electronic devices.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Ming-Long Wang,Yi-Fei Sun,Hong-Nan Chen,Jin-Rong Zhong,Dan Rao,Yu Liu,De-Jun Xuan,Bei Liu,Chang-Yu Sun,Guang-Jin Chen
The CO 2 -H 2 O emulsion has multiple advantages in forming hydrate, such as easily adjustable CO 2 -to-H 2 O ratio, large contact area, strong sweep efficiency, and ability to carry chemical agents, which holds great promise for large-scale solid CO 2 geological sequestration. This paper systematically investigates the kinetics of hydrate formation from CO 2 -H 2 O emulsion and the corresponding morphological features in glass beads under different pore sizes at 3.27–7.15 °C and 10–14 MPa. Quantitative results on CO 2 hydrate formation rates, quantities, conversion rates, and hydrate saturations are obtained. Overall, under multi-factors, the conversion rates of CO 2 hydrate range from 22.9 % to 56.3 %, and hydrate saturations range from 18.5 % to 45.4 %. Here, lower temperature and higher pressure can enhance hydrate formation and increase the final conversion rate. As the pore size decreases, CO 2 hydrate conversion ratio increases, but the formation rate shows a significant decline. Additionally, under flowing conditions, hydrate conversion rates are further increased to 44.4 %–76.5 %, and its enhancement mechanism has been observed and revealed. Even though CO 2 droplets remain spatially separated, hydrate formation still demonstrates remarkably rapid propagation. These results prove the potential of CO 2 emulsion as an excellent medium for CO 2 hydrate storage and provide a direction for more effective carbon storage.
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Yuqi Liang,Guangfei Qu,Keheng Pan,Yongheng Yuan,Junyan Li
In this study, an electrochemical sensor based on AgNPs-rGO composites was developed for the rapid detection of the antibiotic ciprofloxacin (CIP). The electrochemical performance of the AgNPs-rGO composite was evaluated by electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV) and differential pulse voltammetry (DPV) systems. The results showed that the AgNPs-rGO composites exhibited the lowest charge transfer resistance and the best electrocatalytic performance compared with Ag or rGO electrodes alone, indicating that the synergistic effect between Ag and rGO significantly enhanced the sensitivity and responsiveness of the electrodes. The modification amount of AgNPs and the coating amount of the material were further optimized, and it was found that the sensor exhibited the best performance when the content of AgNPs was 0.01 mmol and the coating amount was 4 µL. The sensor achieved a detection limit of 6.25 nM (S/N = 3) for CIP, and showed high recoveries (93.20 %–97.25 %) and good reproducibility (RSD < 2.33 %) in real samples of tap water and river water. In addition, tests showed that the AgNPs-rGO composite had a good electrochemical active area, further demonstrating its potential in electrochemical sensors. This study demonstrates that the developed sensor has good sensitivity and stability in CIP detection, which opens up possibilities for its application in environmental and public health fields.
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Journal of Materials Chemistry A
·
2025
·
IF 9.5
Bin Ge,Dong Liang,Yi Lei,Yajie Zhang,Yi Liu,Wei Wu,Yijun Shi,Jun Zhao
Lubricating oil as the “lifeblood” of industry can improve the performance and longevity of machines by orders of magnitude. However, the acidity of oils occurring during operation always results in fatal failures of machine elements. It is a great challenge to monitor oil acidity online in a highly sensitive machine system. In this study, a self-powered, real-time, online triboelectric sensor was developed for detecting oil acidity based on oil-solid triboelectricity (OA-TENG). By engineering a tribo-surface molecular structure with fluorocarbon chains and amino groups, the contact angle of the optimized triboelectric surface changed to ∼155°, which was much higher than that of commercial polytetrafluoroethylene (PTFE, ∼40°). Furthermore, the real-time adsorption of aged oils on the optimized surface was achieved using quartz crystal microgravimetry with dissipation (QCM-D) for oil-solid contact. It was found that the amino group on the surface has the capability of capturing oxygen-containing contaminants generated during aging through hydrogen and covalent bonds, which is able to adsorb with another 0.3 μg cm−1 compared with that without amino groups. Thus, typical acidity contaminants in aged oils can be successfully monitored. The triboelectric output of the optimized OA-TENG was similar to that of the PTFE-based OA-TENG, but the monitoring sensitivity of the optimized OA-TENG (∼0.62 V per TAN) was much higher than that of the PTFE-based OA-TENG (∼0.2 V per TAN). The triboelectric sensor's sensitivity reported in this study was also much better than that of the previous method for monitoring oil acidity (∼0.25 V per TAN). This work not only provides new pathways for oil condition monitoring with high sensitivity but also greatly expands the applicability of TENGs.
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CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Ying Zhang,Wenhui Li,Lican chen,Ao Zhang,Youming Dong,Haijiao Kang,Jianzhang Li
This study develops a bamboo modification strategy using a poly(ethylene glycol) dendrimer (PEGD)-phenylboronic acid (PBA) network to mitigate moisture-driven degradation. The PEGD-PBA system, synthesized via sequential Michael addition and thiol-ene click reactions, forms a dynamic 3D network within bamboo xylem, effectively suppressing hygroscopic behavior. Low-field NMR coupled with hydroxyl peak deconvolution analysis confirmed reduced free/bound water distribution in modified bamboo. The material achieves 100 % inhibition of Aspergillus niger growth (20 × enhanced mildew resistance) and retains high mechanical strength (150 MPa tensile strength) while resisting hygroscopic expansion. Simultaneous flame retardancy enhancement demonstrates a multifunctional platform for durable, fire-resistant bamboo. This molecular engineering approach addresses bamboo’s intrinsic vulnerabilities, advancing its utility in sustainable structural applications.
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POLYMER COMPOSITES
·
2025
·
IF 4.7
Huanhuan Wang,Qi Qu,Jun Yang,Qingbin Tian,Jin Wang,Jiming Gao,Yufeng Liu,Yan He
The practical application of polyamide 6 (PA6) in structural engineering is hindered by its limited toughness and weak interfacial interaction with reinforcing fillers. Carbon nanotubes (CNTs) have been widely explored to overcome these deficiencies, yet their strong tendency to agglomerate and poor compatibility with PA6 restrict efficient load transfer. Herein, we propose a solvent-free one-pot in situ polymerization strategy that simultaneously functionalizes carboxylated CNTs with bis(3-aminopropyl)-terminated polydimethylsiloxane (APDMS) and integrates them into PA6 during ε-caprolactam polymerization. Compared with neat PA6, the nanocomposites exhibited increases of 16.1% in tensile strength, 21.9% in flexural strength, and 10.3% in notched impact strength. These improvements originate from a chemically bridged siloxane interphase, in which APDMS provides dual amino groups for covalent coupling and a flexible backbone for interfacial stress dissipation. The proposed approach eliminates the need for organic solvents and multi-step procedures, providing an environmentally friendly and scalable route to tailor interfacial structures. This work not only demonstrates a balanced enhancement in stiffness, strength, and toughness, but also provides mechanistic insights into interphase engineering for advanced thermoplastic nanocomposites. Highlights Solvent-free one-pot in situ polymerization for CNT/PA6 nanocomposites. Bis(3-aminopropyl)-terminated polydimethylsiloxane (APDMS) enables CNT grafting and PA6 chain growth via dual reactivity. Robust siloxane interphase improves CNT dispersion and stress transfer. Balanced strength and toughness achieved in CNT/PA6 nanocomposites. Interphase reinforcement arises from covalent bonds and stress-dissipating siloxane.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Wenyuan Huang,Guiyuan Yang,Min Li,Yalan Yu,Hao Wang
In this study, polyvinyl alcohol/zirconium (PVA/Zr) hollow microspheres with a flower-like surface morphology are synthesized via the integration of microfluidic technology, complexation, and coprecipitation principles. This approach results in adsorption materials with exceptional characteristics, such as a high specific surface area, excellent monodispersity, and efficient recyclability. Microspheres exhibit a maximum phosphate adsorption capacity of 73.58 mg/L at pH = 2. When the initial phosphate concentration increases to 125 mg/L, the removal efficiency decreases by 54%, while the adsorption capacity remains at 60.56 mg/g. At a dosage of 0.05 g, the phosphate sorption capacity declines by 40 mg/g, but the phosphate removal rate rises by 50.59%. The theoretical maximum adsorption capacity of the microspheres is 146.53 mg/g. Furthermore, the kinetics and isothermal adsorption behavior of phosphate on PVA/Zr hollow microspheres are systematically investigated. This comprehensive analysis contributes to the development of a novel technology for addressing phosphate pollution.
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