International Journal of Electrochemical Science
·
2023
·
IF 1.5
Yanju Wu,Jianyao Kou,Lijie Wang,Long Cheng,Kui Lu
In this work, Langmuir-Blodgett (LB) technique was proposed to fabricate the homogeneous and controlled films of Nafion-nitrogen doped carbon nanotubes (Nafion-NCNTs). Microstructure and electrochemical performance of LB films of Nafion-NCNTs was characterized by atomic force microscopy (AFM) images, scanning electron microscopy (SEM) images and electrochemical experiments. Moreover, the LB film of Nafion-NCNTs was transferred to the surface of glassy carbon (GC) electrode to fabricate the electrochemical sensor to apply for determination of caffeine. Electrochemical experiments show that the LB films of Nafion-NCNTs modified GC electrode can effectively increase electrochemical response of caffeine. Under the optimum conditions, the oxidation peak current of caffeine was proportional to its concentration in the range of 8.0 × 10 -8 ~ 4.0 x 10 -6 mol L -1 , with a detection limit of 2.0 × 10 -8 mol L -1 . And the modified GC electrode showed excellent selectivity, good stability and repeatability. It also was successfully used for determination of the content of caffeine in tea samples.
研究领域:
材料科学
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分析化学
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FOOD RESEARCH INTERNATIONAL
·
2026
·
IF 8.8
Xingyi Li,Yajuan Li,Wei Mao,Hui Zhou,Xiankang Fan,Zhonghua Liu,Maiquan Li,Jie Luo
NMR and Langmuir show EGCG binds MFGM phospholipids/proteins, altering key regions. • EGCG reduces sphingomyelin collapse pressure, proving strong binding. • H-bonding and hydrophobic forces drive EGCG-MFGM complexes. • PC binds strongest among lipids, while β-casein shows optimal protein binding. This study investigated the interaction mechanisms between epigallocatechin gallate (EGCG) and key milk fat globule membrane (MFGM) components, aiming to elucidate the basis for MFGM-catechin interactions. Initial evidence from 1 H and 31 P NMR spectroscopy revealed EGCG-induced chemical shifts in critical regions. Furthermore, Langmuir monolayer studies simulating MFGM demonstrated concentration-dependent interactions of EGCG with the membrane interface. A significant reduction in the collapse pressure of sphingomyelin monolayers (from 43.84 ± 2.58 mN/m to 27.41 ± 3.06 mN/m) provided direct evidence of strong EGCG-phospholipid binding. Atomic force microscopy (AFM) further corroborated these interactions, indicating EGCG-induced lipid aggregation and protein structural alterations. Fourier transform infrared (FTIR) spectroscopy, molecular docking, and molecular dynamics simulations identified hydrogen bonding and hydrophobic interactions as the primary driving forces for these phenomena. Overall, these results elucidate the molecular mechanisms underpinning EGCG-MFGM component interactions, providing a foundational understanding for leveraging MFGM constituents to alleviate EGCG-related astringency in food applications. Download: Download high-res image (242KB) Download: Download full-size image
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CHEMICAL ENGINEERING JOURNAL
·
2025
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IF 13.2
Meng He,Xin Zhu,Yehui Ding,Lianjun Wang,Yuxing Luo,Xiangdong Ding,Xue Liu
Sulfur hexafluoride (SF 6 ) is a widely used insulating gas and a greenhouse gas which requires efficient recycling to minimize its environmental impact. Conventional membrane materials, such as zeolites, polymers, and metal-organic frameworks (MOFs), often suffer from harsh fabrication conditions or insufficient selectivity/permeability. In this work, we present a facile strategy for fabricating a noncovalently bonded polyaromatic hydrocarbon (PAH) monolayer membrane for efficient N 2 /SF 6 separation. The PAH monolayer with a thickness of 1.35 nm was prepared via Langmuir Schaefer (LS) method by using hexa(terpyridine) hexaphenylbenzene (HTPHPB) on air-water interface. Strong π-π stacking interaction between HTPHPB molecules stabilizes the monolayer, while the resulting intermolecular transient nanopores enable selective SF₆ separation from N₂. The resulting 4 layers of HTPHPB membrane, assembled at 25 mN·m −1 , exhibits exceptional SF 6 /N 2 separation performance with a selectivity of 155 ± 4 and a N 2 permeance of 136 ± 4 GPU, overcoming the inherent trade-off between selectivity and permeability in traditional organic membranes. Notably, the membrane maintains its separation performance even under bending, demonstrating excellent mechanical flexibility. This study offers a tunable and scalable organic membrane design strategy, paving the way for industrial applications in SF 6 recovery and gas separation.
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JOURNAL OF MATERIALS SCIENCE
·
2015
·Vol. 51
·期 6
·3257-3270
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IF 2.371
Nian Pei,Su Meihui,Yu Ting,Wang Zheng,Zhang Binxing,Shao Xiuli,Jin Xiaoyong,Jiang Nanzhe,Li Shan,Ma Qiang
A novel highly compact and b -oriented MFI-type zeolite monolayer was obtained by assembling sec -butanol-modified rounded-coffin-shaped silicalite-1 microcrystals by Langmuir–Blodgett (LB) method. The LB monolayer was subsequently tested as a seed layer for the secondary growth of uniformly b -oriented and defect-free MFI zeolite films on stainless steel substrates and platinum electrodes. Three different methods were evaluated for identifying a suitable synthesis route to suppress the undesired a -oriented twin growth during the synthesis of MFI films. The crystal intergrowth and orientation of the MFI films were characterized by scanning electron microscopy and X-ray diffraction (XRD). The crystallographic preferred orientation indices and preferred orientation coverage values calculated using the XRD data were used to quantitatively determine the preferred orientation and surface coverage of the prepared zeolite films. The experimental results confirm that the low tetrapropylammonium hydroxide (TPAOH) method is the most effective route to suppress the undesired a -oriented twin growth, when the highly b -oriented LB monolayer was used as the seed layer for the secondary growth of the b -oriented MFI film. The highly b -oriented MFI-type zeolite film-modified electrodes were further tested as the working electrodes in electrochemical experiments. Cyclic voltammetry experimental results confirmed that the b -oriented MFI films fabricated at low TPAOH concentration were defect free and possessed a distinct molecular sieving property after calcination. The LB method, a highly reproducible and controllable method for the organization of zeolite crystals, can be further applied as an effective platform for the promotion and development of zeolite-modified electrodes as selective sensors. Graphical
研究领域:
材料科学
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电化学
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纳米材料
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传感器
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薄膜制备
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晶体工程
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
·
IF 3.131
Kai Ma,Ran Wang,Tifeng Jiao,Jingxin Zhou,Lexin Zhang,Jinghong Li,Zhenhua Bai,Qiuming Peng
Constructing graphene oxide (GO)-based 2D nanomaterials via facile and appropriate methods have aroused much attention due to their potential applications in many fields. Herein, by Langmuir-Blodgett (LB) technique, we have successfully fabricated GO-based films composited with porphyrin molecules. By the reaction of diazotization and Fischer osazone, different surface states of GO sheets with sulfonate groups were obtained. The amphiphilic GO and surface modified GO sheets could spontaneously form composite films at the air/water interface with porphyrin molecules (TMPyP) by electrostatic interactions and π-π stacking. Since the sheets can perfectly float on the interface, the TMPyP molecules were adsorbed on the floating-layers and self-assembled into highly ordered J-aggregate structures. The morphological characterization results showed the composite films with smooth and dense surface. Due to the different surface state of the nanosheets, the aggregate states of porphyrin molecules were different which could be demonstrated in the UV–vis spectra. The results indicated that the induction of sulfonate groups and the types of oxygen-containing groups have played important roles for regulating the aggregate state of porphyrin molecules.
研究领域:
材料科学
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化学
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高影响因子
TALANTA
·
2013
·
IF 3.498
Lina Zou,Yinfeng Li,Shaokui Cao,Baoxian Ye
Gold nanoparticles/polyaniline nanocomposite thin film was deposited onto the surface of glassy carbon electrode(GCE) by Langmuir–Blodgett(LB) technology to fabricate a new voltammetric sensor (GNPs/PAn-LB GCE) for epinephrine(EP) and uric acid(UA) detection. Cyclic voltammetry , electrochemical impedance spectroscopy and atomic force microscopy were employed to study the characteristic of the GNPs/PAn-LB film. Electrochemical behaviors of EP and UA at the modified electrode were investigated in pH 6.6 phosphate buffer solutions. A sensitive electroanalytical method for simultaneous determination of EP and UA was proposed with high precision and good reproducibility.
研究领域:
分析化学
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电化学
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生物传感
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PubMed
高影响因子
TALANTA
·
2014
·
IF 3.511
Lina Zou,Yinfeng Li,Shaokui Cao,Baoxian Ye
DNA–polyaniline (PAn) complex Langmuir–Blodgett film modified glassy carbon electrode (GCE) was used as a new voltammetric sensor (DNA/PAn-LB/GCE) for xanthine (XA) detection. The characteristic of DNA/PAn-LB film was studied by electrochemical impedance spectroscopy and scanning electron microscope. Electrochemical behaviors of XA at the sensor were studied in pH 7.0 phosphate buffer solutions by cyclic voltammetry and differential pulse anodic voltammetry. The results showed that this new modified electrode exhibited an excellent immunity from uric acid and hypoxanthine interference and a new sensitive and selective electroanalytical method for XA was proposed with wider linear range. Under the optimum conditions, the calibration curve for XA was obtained over the range of 7.0×10 −8 –1.0×10 −5 mol L −1 , with the detection limit of 3.0×10 −8 mol L −1 . The practicability of this method was demonstrated by determining the concentration of XA in human serum samples.
研究领域:
分析化学
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电化学
·
生物传感器
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JOURNAL OF ALLOYS AND COMPOUNDS
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2017
·
IF 3.133
Mingjun Cui,Siming Ren,Qunji Xue,Haichao Zhao,Liping Wang
Inspired by the high water solubility and low cytotoxicity of N doped carbon dots (CDs) prepared by using antibiotic aminosalicylic acid (ASA) as precursor, we anticipate that these CDs may possess an excellent protective ability to inhibit the corrosion of carbon steel in aggressive solutions owing to its special structure. Therefore, the investigation on the inhibiting effect of CDs as eco-friendly corrosion inhibitor for Q235 carbon steel corrosion in 1 M HCl solution is first reported. Electrochemical techniques , weight loss, morphological and elements characterization are combined to investigate the inhibiting effect and corrosion mechanism. The results show that corrosion of Q235 carbon steel in 1 M HCl solution is significantly inhibited by the addition of CDs, which is attributed to the formation of CDs adsorption film, and the adsorption of CDs obeys a Langmuir adsorption isotherm . Besides, the protection efficiency increases with increasing concentration of CDs and prolonged immersion time, and reaches equilibrium eventually.
研究领域:
材料科学
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环境科学
·
电化学
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DOI
高影响因子
CRYSTENGCOMM
·
2024
·
IF 2.6
Yang Zhou,Dan Wang,Qiuxiang Feng,Qi Wu,Feng Cao,Li Jiang,Qianli Zhang,Jie Liu
Synthesizing stable MOF materials with good adsorption capability in a relatively green way is well worth investigating. In this work, a stable Ce-UiO-66-NH2 MOF was constructed from Ce(IV) salts and a bifunctional ligand, 2-amino terephthalic acid, in a mixture of water and ethanol at room temperature. The MOF solid was fully characterized and its adsorption properties for methylene blue were investigated in detail. Ce-UiO-66-NH2 showed excellent removal ability of MB over a wide pH range, the adsorption process followed a pseudo-second-order kinetic model, and the isothermal adsorption data fit well with a Langmuir model with a maximum capacity of 427 mg g−1. Moreover, a spontaneous heat adsorption process was concluded from thermodynamic study, and this MOF sorbent can be reused for several cycles with its structural stability maintained. A possible mechanism for MB adsorption was also proposed.
研究领域:
材料科学
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环境科学
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高影响因子
Nanoscale
·
2012
·Vol. 4
·期 7
·2423-2430
·
IF 5.914
Qing Cao,Feng Huang,Zanyong Zhuang,Zhang Lin
This work aims at the investigation of nano-Mg(OH)2 as a promising adsorbent for uranium recovery from water. Systematic analysis including the uranium adsorption isotherm, the kinetics and the thermodynamics of adsorption of low concentrations of uranyl tricarbonate (0.1–20 mg L−1) by nano-Mg(OH)2 was carried out. The results showed a spontaneous and exothermic uranium adsorption process by Mg(OH)2, which could be well described with pseudo second order kinetics. Surface site calculation and zeta potential measurement further demonstrated that UO2(CO3)34− was a monolayer adsorbed onto nano-Mg(OH)2 by electrostatic forces. Accordingly, the adsorption behavior met the conditions of the Langmuir isotherm. Moreover, in most of the reported literature, nano-Mg(OH)2 had a higher UO2(CO3)34− adsorption affinity b, which implied a higher adsorption amount at equilibrium in a dilute adsorbate system. The significance of the adsorption affinity b for choosing and designing adsorbents with respect to low concentration of resources/pollutants treatment has also been assessed.
研究领域:
环境科学
·
材料科学
·
放射化学
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高影响因子
LANGMUIR
·
2018
·
IF 3.789
Yan Xiong,Qing Wang,Ming Duan,Jun Tan,Shenwen Fang,Jiayi Wu
An interface research method based on total internal reflection induced evanescent wave (TIR-EW) is developed to monitor the adsorption behavior of azo dye at the silica–water interface. The monitoring system is constructed by employing silica optical fiber (SOF) as both charged substrate for dye adsorption and light transmission waveguide for evanescent wave production. According to the change of evanescent wave intensity and followed by Beer’s law, the methylene blue (MB) adsorption behavior can be real-time monitored at the silica–water interface. Langmuir adsorption model and pseudo-first-order model are applied to obtain the related thermodynamic and kinetic data. The adsorption equilibrium constant (Kads) and adsorption free energy (ΔG) of MB at the silica–water interface are determined to be (3.3 ± 0.5) × 104 M–1 and −25.7 ± 1.7 kJ mol–1. Meanwhile, this method is highlighted to isolate elementary processes of adsorption and desorption under steady-state conditions, and gives adsorption rate constant (ka) and desorption rate constant (kd) of 8585 ± 19.8 min–1 and 0.26 ± 0.0006 min–1 for 15 r/min flow rate. The surface interaction process is revealed and adsorption mechanism is proposed, indicating MB first adsorbed on Si–O– sites through electrostatic attraction and then on Si–OH sites through hydrogen bond with increasing MB concentrations. Our findings from this study provided molecular-level interpretation of azo dye adsorption at silica–water interface, and the results provide important insight into how MB adsorption can be controlled at the interface.
研究领域:
分析化学
·
环境科学
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高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2020
·
IF 4.794
Yuping Chen,Zipeng Yang,Qianxin Zhang,Daijun Fu,Ping Chen,Ruobai Li,Haijin Liu,Yalan Wang,Yang Liu,Wenying Lv,Guoguang Liu
Tartaric acid (TA) is an important component of plant rhizosphere secretion, having a certain influence on the adsorption and desorption behavior of heavy metals in soil. Humin could serve as an environmentally compatible passivator of heavy metal in soil. The aims of this study were to simulate the adsorption of Pb (II) via humin in a soil solution, explore the effects of TA on the adsorption of Pb (II) by humin and elucidate the mechanism of its influence. The results indicated that the adsorption of Pb (II) on the surface of humin within and without TA was consistent with the Langmuir isotherm equation and the pseudo-secondary kinetic model (R 2 > 0.99). The effect of TA on adsorption was related to the concentration of TA. With the increasing of TA concentration, the adsorption of Pb (II) by humin showed a peak change and the adsorption amount reached the maximum with 0.5 mmol L −1 humin, is 192.31 mg L −1 with 0.1 mmol TA. Basing on adsorption experiments and characterization of FTIR, SEM, EDX and XPS. It revealed that the oxygenated groups of TA can be combined with humin by hydrogen bonding, in the low concentration TA (less than 0.5 mmol L −1 ), which is equivalent to an increment of the carboxyl group on the surface of humin, thus adsorption amount was increased. The increasing of the concentration of TA led to an increment of free TA in the solution, which would complex with the lead ions in the solution, and indirectly reduce the amount of Pb(II) adsorption on the humin.
研究领域:
环境科学
·
土壤化学
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高影响因子
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