BIOSENSORS & BIOELECTRONICS
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2019
·
IF 9.518
Jiangle Yi,Zhen Liu,Jianhui Liu,Hanbiao Liu,Fangquan Xia,Dong Tian,Changli Zhou
A novel label-free electrochemical aptasensor was fabricated based on a three-dimensional porous electrode (3D-CS/rGO/GCE) for the detection of acetamiprid residues. The sensing signal was generated by the DNA itself. The porous electrode was prepared by electrodeposition in situ and characterized by scanning electron microscope (SEM), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). These results indicated that the porous electrode has a uniform nanoporous structure, high active area, and excellent conductivity , leading to improve the transmission efficiency of current signals. The 3D-CS/rGO/GCE was used to increase a load of acetamiprid aptamer on the electrode. Meanwhile, DNA self-assembly strategy was used to further increase the DNA amounts. Thus the electrochemical current was amplified significantly due to increased phosphate group amounts by the above synergistic effect . The determination of acetamiprid residues using square wave voltammetry (SWV) showed good sensitivity, with the linear range from 0.1 pM to 0.1 μM and the detection limit was 71.2 fM. The label-free electrochemical aptasensor was also used to detect acetamiprid residues in tea samples with satisfactory results.
研究领域:
分析化学
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环境科学
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食品科学
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DOI
高影响因子
Polymers
·
2022
·Vol. 14
·期 12
·2512
·
IF 4.967
Fanghua Luo,Chen Ma,Yuhui Tang,Lintao Zhou,Youpeng Ding,Guohua Chen
High thermal conductivity polymer matrix composites have become an urgent need for the thermal management of modern electronic devices. However, increasing the thermal conductivity of polymer-based composites typically results in loss of lightweight, flexibility and electrical insulation. Herein, the polyvinyl alcohol (PVA)/PVA-chitosan-adsorbed multi-walled carbon nanotubes/PVA (PVA/CS@MWCNTs) composite films with a sandwich structure were designed and fabricated by a self-construction strategy inspired by the surface film formation of milk. The obtained film simultaneously possesses high thermal conductivity, electrical insulation, and excellent flexibility. In this particular structure, the uniform intermediate layer of PVA-CS@MWCNTs contributed to improving the thermal conductivity of composite films, and the PVA distributed on both sides of the sandwich structure maintains the electrical insulation of the films (superior electrical resistivity above 1012Ω·cm). It has been demonstrated that the fillers could be arranged in a horizontal direction during the scraping process. Thus, the obtained composite film exhibited high in-plane thermal conductivity of 5.312 W·m−1·K−1at fairly low MWCNTs loading of 5 wt%, which increased by about 1190% compared with pure PVA (0.412 W·m−1·K−1). This work effectively realizes the combination of high thermal conductivity and excellent electrical insulation, which could greatly expand the application of polymer-based composite films in the area of thermal management.
研究领域:
材料科学
·
热管理技术
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Zhe Hong,Chuanfang Xiong,Xin Wang,Fangtao Huang,Lei Li,Zhirong Zhu
Side-chain alkylation of toluene with methanol is a potential route for producing styrene. However, there are several challenges that prevent its industrialization, comprising the decomposition of methanol to CO and H 2 , and unavoidable by-products of ethylbenzene. Herein, we disclose that X zeolite after ion exchange of ammonium have an interesting and unexpected feature. It can modulate the Lewis acid-base pairs, via in situ ammonia production from ammonia pools, meanwhile, lead to more Cs + species left in the zeolite, thereby constructing a superior catalyst for toluene side-chain alkylation. Especially for CsX-ex-AP catalyst, the ammonia pools effect (APE) in CsX-ex can achieve both higher toluene conversion and styrene selectivity. Furthermore, the methanol utilization efficiency increases significantly after APE reduction, indicating the selective catalysis for non-oxidative methanol dehydrogenation by in situ NH 3 production from ammonia pools. In addition, the APE reduction contributes to the formation of the active intermediates of m -HCOO* species, which is another reason responsible for the superior performance.
研究领域:
催化化学
·
材料科学
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DOI
高影响因子
IRANIAN POLYMER JOURNAL
·
2024
·
IF 2.4
Yang Guoqian,Liu Mengmeng,Su Yingfeng,Yu Chi
Amidst the relentless innovation in materials science and bone tissue engineering, the quest for next-generation bone graft materials with bespoke functionalities has emerged as a pivotal research domain. This study produced and characterized a novel bone healing material. First, we explained how three-armed polylactic acid (3s-PLA) was created in supercritical carbon dioxide (ScCO 2 ) and utilized as a matrix material. Following that, we described how the solution blending approach was employed to create three-armed polylactic acid/chitosan/nanohydroxyapatite (3s-PLA/CS/nHA) composites. The composites were then drug-loaded with prednisone acetate as a model drug utilizing the supercritical impregnation technique. Ultimately, the Ritger-Peppas model was substantially followed by the drug release of the drug-loaded composites when the in vitro drug-release kinetics of the drug-loaded materials were investigated. The porous structure of 3s-PLA was demonstrated by differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FTIR), and nuclear magnetic resonance (NMR) hydrogen spectroscopy. Morphologic studies using scanning electron microscopy (SEM) revealed the homogeneous distribution of drug in the matrix of the mixtures as well as the porous structure of 3s-PLA and 3s-PLA/CS/nHA. The hydrophilicity of 3s-PLA/CS/nHA was examined by the use of water contact angle (WCA), revealing that the material in question has a hydrophilic water contact angle of 45.69°. Furthermore, research was conducted using one-way tests and investigations to characterize in vitro drug-release carrier materials under various drug conditions and temperatures. The carrier material consistently released up to 84.8% of prednisone acetate over the course of 72 h, demonstrating good control over prolonged release, according to the results. Graphical abstract
研究领域:
材料科学
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骨组织工程
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药物递送系统
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超临界流体技术
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 142
·期 2
·e56356
·
IF 2.7
Rongying Xia,Zhixiu Yang,Dayu Sun,Ziqi Wang,Mingzhu Yao,Huijun Liu,Lei Yang,Guanghui Ma,Lijing Gao,Ruiping Wei,Guomin Xiao,Xiaomei Pan
Achieving satisfactory separation of N, N-Dimethylformamide (DMF)/water is still challenging in industrial wastewater treatment. To address this issue, a novel method involving pervaporation (PV) separation using polyvinyl alcohol/chitosan (PVA/CS) blend films is proposed. Various characterization methods confirmed the strong compatibility between PVA and CS, and the blending improved their mechanical properties and thermal stability. Heat treatment significantly reduced the swelling degree of the membranes. In a binary aqueous system with low concentrations of DMF, controlled separation can be achieved by adjusting the blending ratio of PVA to CS. The membranes exhibited preferential selectivity for DMF when the CS content is 40–75 wt%, which allowed for the concentration and recovery of DMF. At 20 °C with a feed of 10 wt% DMF solution, 2 h heat-treated PVA/CS-50 membrane exhibited the best performance, which could be attributed to its strong hydrogen bonding force, with a total flux of 484.09 g m −2 h −1 and a separation factor of 5.41 for DMF. The PVA/CS blend membranes exhibit excellent acid and alkali resistant and are promising candidates for the separation and recovery of DMF from industrial wastewater by membrane technology.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2026
·
IF 2.4
Jia Xu,Xun Wang,Jiazheng Qin,Ziwei Hu,Ruyi Lin,Yong Ma,Dan Li,Lingzong Meng
The solid–liquid phase equilibria of the quaternary system Na+, Cs+//Cl–, CO32––H2O and its subsystem Na2CO3–Cs2CO3–H2O at 308.15 K were studied by the isothermal dissolution method. The phase diagram of the system Na2CO3–Cs2CO3–H2O is composed of two single-salt crystallization fields of Na2CO3·H2O and Cs2CO3·H2O, two solubility univariant curves, and one invariant point. The dry-salt phase diagram of the quaternary system consists of three invariant points, seven univariant curves, and five crystallization regions corresponding to Na2CO3·H2O, NaCl, solid solution [Cs1–x(Na·H2O)x]Cl, Cs2CO3·H2O, and double salt CsCl·2NaCl·2H2O. The areas of crystallization zones decrease according to the above order. The Jan̈ecke index of H2O, pH, and refractive index of the liquid phase in the quaternary system change regularly with the Jan̈ecke index of Cs+. These results on the phase diagram of the quaternary system can supply theoretical references for cesium salt separation from carbonate-type brine.
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Dan Li,Dongping Yang,Qiujing He,Shiqiang Tu,Zhun Xiang,Lifei Huang,Yueming Jiang,Liang Gong
HPCS-stabilized lignin nanoparticles enhanced natamycin solubility and stability. • Gelatin/ZnO films incorporated with LNPs showed superior mechanical and barrier properties. • Films exhibited synergistic photothermal and ROS-mediated antibacterial activity. • Lignin shielded natamycin from degradation, balancing stability and antibacterial efficacy. • Coating extended sweet potato shelf life and showed favorable biodegradability. To address the poor photostability and low aqueous solubility of natamycin (N), a hydroxypropyl chitosan (HPCS)-stabilized lignin nanoparticle (LNP) delivery system (LNP-N/HPCS) was developed in this study. The results showed that the nanocarriers exhibited a high encapsulation efficiency (89.17 ± 2.8%) and a moderate loading efficiency (11.63 ± 0.1%), while significantly increasing the solubility of natamycin to 13.5 times that of its free form at room temperature. Structural analysis indicated that LNP-N/HPCS formed stable core–shell-like nanostructures through hydrogen bonding, van der Waals forces, and π–π interactions, enabling efficient loading and stable dispersion. Furthermore, the delivery system was incorporated into gelatin/ZnO composite films (Gel/ZnO/LNPs) to construct multifunctional active packaging materials. The resulting composite film exhibited good antioxidant activity, mechanical properties, and gas barrier properties. After 10 min of xenon lamp irradiation, the composite film rapidly heated to 54.6 °C. After 150 min of irradiation, 67.55% of the initial natamycin content remained in the Gel/ZnO/LNPs5 composite film, whereas the retention rate of free natamycin was only 24.72%, indicating that the LNP delivery system improved the photostability of natamycin. In addition, the composite system exhibited good antibacterial activity in both film-forming solutions and solid films. In particular, Gel/ZnO/LNPs5 exhibited nearly complete growth inhibition against Escherichia coli , Staphylococcus aureus , and Dickeya dadantii E36 after 10 min of light irradiation, and achieved an inhibition rate of approximately 85% against Fusarium solani-melongenae 24–3. After 150 min of continuous irradiation, the Gel/ZnO/LNPs5 film still exhibited an inhibition rate of 55.67% against Fusarium solani-melongenae 24–3. Practical application results showed that the composite film could delay quality deterioration of sweet potatoes during storage to some extent and gradually disintegrated within approximately 6 days in soil. In addition, no significant inhibitory effect was observed in the seed germination test. Overall, this study provides an effective strategy for developing multifunctional food packaging materials with photothermal responsiveness, light-enhanced antimicrobial activity, and postharvest preservation functions. Download: Download high-res image (225KB) Download: Download full-size image
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DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2026
·
IF 5.1
Tingting Yan,Junyang Liu,Jie Li,Senlin Deng,Gang Wang,Zhenyong Miao,Chunshan Li
The Cs-Zr/SiO 2 exhibits excellent catalytic performance on the aldol condensation of methyl propionate with formaldehyde to methyl methacrylate (MMA), however, the catalyst deactivation caused by coking still remains challenging. In this work, the coke deposition induced deactivation behavior of Cs-Zr/SiO 2 samples prepared by ion-exchange and impregnation methods were systematically investigated using NMR, Raman spectroscopy, physical N 2 adsorption–desorption, HR-TEM and TG analysis. The results show that the catalyst prepared by the ion-exchange strategy mainly forms removable amorphous carbon of aliphatic species and polycyclic aromatic hydrocarbons, whereas the impregnated sample tends to evolve from similar sources into carbonaceous compounds with higher graphitization degree and structural stability. Further analysis of the deactivation mechanism indicates that different amounts and types of coke deposited on the catalyst surface induce pore blockage, ultimately leading to catalyst deactivation. MMA is verified as the primary source of coke formation, with proposal of detailed pathway, through comparative experiments using different feed streams. Furthermore, a kinetic model for carbon deposition on the catalyst prepared by ion-exchange method was established by modification of classical Voorhies equation with feed component, and the apparent activation energy for coke formation is determined as 79.4 kJ/mol.
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Yongqian Shi,Xiaoyong You,Haoxin Niu,Can Liao,Longcheng Tang,Jiefeng Gao,Pingan Song,Wei Zhang,Ting Qiu
In view of the prominent issues in compatibility, sustainability, and performance stability of existing polymer-based electromagnetic interference (EMI) shielding films, this work proposes a strategy for preparation of a series of novel flame retardant and EMI shielding composite films, which were fabricated using cellulose nanofibers (CNF)/MXene/chitosan-modified hollow glass microspheres (HGM@CS) as the matrix, and flame-retardant thermoplastic polyurethane (TPU/APP-NH 2 @LDH) as the encapsulation shell. The results demonstrated that the CNF/MXene/HGM@CS/TPU/APP-NH 2 @LDH (CM x HTA) composite films exhibited good hydrophobicity (with a water contact angle of 100.6°), and superior flame retardancy. The peak heat release rate and total heat release of as-prepared CM 2 HTA composite film were decreased by 53.0% and 52.2%, respectively, compared with those of pure CNF/TPU composite film. The improvement in flame-retardant performance is attributed to the synergistic mechanism of APP-NH 2 @LDH, HGM@CS, and MXene in both the gas phase and the condensed phase. Due to the electromagnetic shielding mechanism of “surface reflection-internal absorption”, the values of EMI shielding effectiveness of the CM 3 HTA composite film reached 43.5 dB and 56.7 dB in the X-band and K-band, respectively, far exceeding the requirements for commercial shielding materials (≥20 dB). This study provides a new approach for developing high-performance, multifunctional, and environmentally friendly electromagnetic shielding composites in the application of electronic protection, smart packaging and wearable devices, etc.
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产品关联
DOI
高影响因子
JOURNAL OF PHYSICAL CHEMISTRY B
·
2026
·
IF 3.2
Ya-Li Wang,Rui-Zhi Cui,Hong-Bao Ren,Qiu-Ye Yang,Wu Li
To investigate the formation process of cesium in a system where chlorine and bromine coexist, as well as the laws governing solid–liquid phase equilibrium, this paper conducts a multiscale study of the CsCl–CsBr–H2O ternary system at 298.15 K. First, the formation process of Cs(Cl, Br) solid solutions was investigated through long-term experiments, while molecular dynamics simulations were employed to examine the coordination and migration of ions at different stages of the reaction. Building on this, the isothermal dissolution equilibrium method was used to systematically determine the stable phase equilibrium relationships in this system and to plot a phase diagram; furthermore, various solid-state characterization analyses were performed on the equilibrium solid phase. Finally, utilizing the thermodynamic data obtained from the experiments, the Pitzer model was parametrized to calculate the solubility of this solid solution system, which was then compared with the experimental results. This research provides a theoretical basis for understanding and predicting the precipitation behavior of cesium in systems where chlorine and bromine coexist.
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Yanping Wang,Dezhen Fang,Kexin Li,Xiushen Ye,Wenjie Han,Pengrui Zhang,Zhijian Wu,Guosheng Shi,Haining Liu
APPW adsorbent designed via 4-aminopyridine (4-AP) tuning of the adsorption energy window. • Achieves ultra-high Cs + selectivity with an Rb + /Cs + separation factor of 11,122. • Enables one-step Cs + separation without Rb + interference. • Shows strong resistance to coexisting ions in salt lake brines and ore leachates. • Establishes a new strategy of adsorption energy window modulation for ion separation. Efficient separation of Cs + from Rb + remains a critical bottleneck due to their similar ionic properties. This work fabricates a 4-aminopyridinium phosphotungstate (APPW) adsorbent by substituting conventional NH₄ + in phosphotungstic acid (HPW) with tailored4-Amino pyridinium ion (4-AP + ) cations to construct a tunable adsorption energy window. DFT calculations confirm the binding energy order ΔE (Rb + -PW) > ΔE (4-AP + -PW) > ΔE (Cs + -PW) , which thermodynamically enables exclusive exchange of 4-AP + by Cs + and suppresses Rb + adsorption. APPW delivers an ultrahigh Rb + /Cs + distribution coefficient of 11,122, outperforming previously reported adsorbents. At Rb + /Cs + molar ratio of 10:1 mimicking natural brine, APPW still achieves selective Cs + capture with negligible Rb + uptake and stable performance across pH 2–11. Coexisting Li + , Na + , K + , Ca 2+ , Mg 2+ barely interfere with Cs + selectivity. Adsorption follows Langmuir monolayer chemisorption and pseudo-second-order kinetics, and the endothermic process proceeds spontaneously. After five regeneration cycles with 4-aminopyridine eluent, APPW retains 87.9% initial Cs + capacity. Practical treatment of oilfield brine achieves 81.91% Cs + recovery under high-salinity complex matrices. This study overcomes the poor Cs + selectivity limitation of traditional heteropolyacid materials and establishes a universal molecular design strategy via adsorption energy window modulation, offering a recyclable high-performance adsorbent for one-step Cs + separation from salt lake brines, ore leachates and radioactive wastewater.
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Jingwei Du,Jinjun Li,Zhixiong You
This study explores the preparation of a Cs-doped Ru/ZrO 2 catalyst using a low eutectic system and its application in ammonia synthesis. Additionally, it examines the effect of Cs doping on enhancing the catalyst's resistance to hydrogen poisoning. Compared to the undoped Ru/ZrO 2 catalyst and the Cs–Ru/ZrO 2 –B catalyst prepared through the grinding method for promoter incorporation, the Cs–Ru/ZrO 2 -A catalyst synthesized using the low eutectic system demonstrated significantly enhanced activity. At 400 °C and 0.1 MPa, the Cs–Ru/ZrO 2 -A catalyst achieved an ammonia synthesis activity of 1769 μmol g cat −1 h −1 , which is approximately 35 times higher than that of the undoped Ru/ZrO 2 catalyst. The structure of the catalyst was analyzed using various material characterization techniques, including XRD, XPS, and SEM. The results showed that the Cs–Ru/ZrO 2 -A catalyst, prepared under identical conditions, exhibited no significant structural differences compared to other catalysts. However, further TPR and TPD analyses revealed that Cs interacts with Ru to some extent, affecting its reduction behavior and enhancing the catalytic reaction rate for ammonia synthesis. Additionally, detailed XPS analysis of all catalysts was conducted, leading to a proposed relationship between the catalytic reaction rate and the oxidation states of the metal components. The study revealed that the presence of Cs significantly inhibits hydrogen poisoning of the catalyst. Furthermore, it demonstrated that the addition of promoters enhances H 2 dissociation by supplying electrons to the active metal Ru, while Cs plays a crucial role in effectively suppressing hydrogen poisoning.
研究领域:
催化化学
·
材料科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）