ANALYTICA CHIMICA ACTA
·
2023
·
IF 6.2
Yingshiyu Lin,Lingbo Liu,Gaozhi Ou,Wensheng Huang,Kangbing Wu
Salbutamol (SAL), a drug originally intended for the treatment of bronchial and pulmonary diseases, has repeatedly been used for doping in competitive sports. Herein, an integrated array (NFCNT array) that prepared by template-assisted scalable filtration using Nafion-coated single-walled carbon nanotube (SWCNT) is presented for the rapid field detection of SAL. Spectroscopic and microscopic measurements were used to confirm the introduction of Nafion onto the surface of the array and to analyze the resulting morphological changes. The effects of Nafion addition on the resistance and electrochemical properties of the arrays (e.g., the electrochemically active area, charge-transfer resistance, and adsorption charge) are also discussed in depth. With an electrolyte/Nafion/SWCNT interface and moderate resistance, the NFCNT-4 array prepared containing 0.04 wt% Nafion suspension exhibits the greatest voltammetric response to SAL. Subsequently, a possible mechanism for the oxidation of SAL was proposed, and a calibration curve in the range of 0.1–15 μM was established. Finally, the NFCNT-4 arrays were applied to the detection of SAL in human urine samples with satisfactory recoveries.
研究领域:
分析化学
·
药物检测
·
纳米材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TALANTA
·
2014
·
IF 3.511
Xiaomei Chen,Limin Zhao,Xiaotian Tian,Sai Lian,Zhiyong Huang,Xi Chen
A novel method for the determination of tetracyclines (TCs) using electrochemiluminescence (ECL) based on a Ru(bpy) 3 2+ -doped silica nanoparticles (RuSiNPs)/Nafion film modified electrode is presented in this paper. The RuSiNPs were prepared by a water-in-oil microemulsion method. The characterization results indicated that the thus-prepared RuSiNPs presented a uniform size of 45 nm and retained the original electrochemical properties of Ru(bpy) 3 2+ . Importantly, the ECL response on RuSiNPs/Nafion film modified electrode was greatly enhanced by TCs. Under the optimum conditions, the ECL intensity versus the concentration of TCs was found to be linear over the range of 1–100 μmol L −1 for tetracycline (TC), 0.1–100 μmol L −1 for oxytetracycline (OTC) and 1–100 μmol L −1 for chlortetracycline (CTC). The detection limits ( S / N =3) were 0.23 μmol L −1 for TC, 0.10 μmol L −1 for OTC and 0.16 μmol L −1 for CTC. Moreover, due to the electrostatic interaction between Ru(bpy) 3 2+ and silica matrix, the leaching of Ru(bpy) 3 2+ was greatly reduced, therefore, the ECL sensor exhibited excellent repeatability and stability in the detection of TCs. Based on these investigations, the proposed ECL approach was successfully used to analyze the TCs content in drugs.
研究领域:
分析化学
·
药物分析
·
生物传感
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Yehui Guan,Mingjun Dai,Tong Liu,Yingwei Liu,Fangmeng Liu,Xishuang Liang,Hui Suo,Peng Sun,Geyu Lu
A fuel-cell-type gas sensor based on the membrane electrode assemble (MEA) composed of proton exchange membrane (Nafion) and Pt/C sensing electrodes was fabricated for detection of CO at room temperature . The Pt/C electrodes materials were synthesized from Vulcan XC-72 carbon powders and hexachloroplatinic acid (H 2 PtCl 6 ). This paper mainly focused on the effect of various dispersants (ethylene glycol (EG) tetraethyl orthosilicate (TEOS), glycerol and EG/polytetrafluoro-ethylene (PTFE)) on the performance of the presented sensor. Results revealed that the sensor utilizing EG as the dispersant elicited the highest response current toward 50 ppm CO. The current of the sensor was linearly correlated with CO concentration in the range of 1–200 ppm, which sensitivity was 88 nA/ppm. In addition, the 90% response and recovery times of the sensor toward 50 ppm CO were 22 and 24 s, respectively. Besides, the prepared CO sensor also had a good repeatability and acceptable selectivity.
研究领域:
材料科学
·
传感器技术
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Sha Yu,Guodong Kang,Zhihao Zhu,Meiqing Zhou,Haijun Yu,Yiming Cao
Nafion-PTFE hollow fiber composite membranes were fabricated and applied in vacuum membrane distillation (VMD) process to improve the anti-fouling and anti-wetting performance in the presence of oil and surfactant . The composite membrane exhibited an underwater super-oilphobic property according to the contact angle test. The VMD performance when treating saline feed containing 3.5 wt% NaCl and 1000 ppm mineral oil for the composite membrane behaved a stable flux for 40 h. In construct, an immediate and sharply-declined flux was observed for the pristine PTFE , indicating the significant improvement in the anti-fouling property. Meanwhile, the composite membrane also alleviated the wetting phenomena caused by the surfactant comparing with the pristine PTFE membrane, and the Nafion-PTFE composite membrane behaves a stable flux and high salt rejection higher than 99.99% for 60 h treating saline feed containing O/W emulsions. The pressure depression effect of the Nafion layer on the mass transfer was analyzed. It was found that the depression could be reduced with the increasing of the feed temperature and the enhancement of the corresponding effective pore diameter of the Nafion layer, that the pressure depression factor decreased from 0.23 to 0.04 with the feed temperature increasing from 60 °C to 75 °C.
研究领域:
环境工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2012
·
IF 4.054
Hongwei Zhang,Haiping Huang,Pei Kang Shen
In this paper, a series of Nafion composite membranes with improved methanol barrier properties were fabricated from chitosan (CS) and silicotungstic acid (SiWA) by Layer-by-layer (LbL) self-assembly technique. The Fourier transform infrared attenuated total reflection (FTIR-ATR) spectra and scanning electron microscope (SEM) were employed to prove the successful deposition of CS/SiWA layers. The effect of the methanol-blocking layer on proton conductivity , methanol permeability and direct methanol fuel cell (DMFC) performance was studied. Both proton conductivity and methanol permeability of Nafion composite membranes decreased with the increase of CS/SiWA bi-layer number. The Nafion composite membrane with a reduced proton conductivity of 22% showed a reduced methanol permeability of 47%. Approximate 18% improvement of the selectivity was achieved as compared with plain Nafion membrane . But it did not result in better DMFC performance than that of plain Nafion membrane.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Weijia Li,Lingchu Huang,Tong Wang,Xidong Hao,Bin Wang,Qi Lu,Xishuang Liang,Fengmin Liu,Fangmeng Liu,Chenguang Wang,Geyu Lu
The development of high-performance gas sensors for detecting trace amount of CH 3 OH is an essential and a challenging task for safety using fuel cell vehicles (FCVs). In this work, the metal oxides (SnO 2 , In 2 O 3 , CuO) are employed as the catalyst carrier materials in fuel cell type sensors for the first time to replace traditional carbon, with which the Pt/MO x based fuel cell type sensors are fabricated. Among them, Pt/SnO 2 based sensor displays the lowest detection limit because SnO 2 carrier can not only support Pt particles but also provide an appropriate number of electrons for Pt, which is beneficial to reduce the adsorption strength of the intermediates and then improves the catalytic ability. The detection limit is as low as 0.5 ppm, the lowest of the various types of CH 3 OH sensors that work at room temperature. Moreover, the Pt/SnO 2 based fuel cell type sensor displays the characters of high selectivity, good repeatability and robust moisture resistance. To the best of our knowledge, this is the first report employing MO x as the catalyst carrier materials in fuel cell type sensors.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2023
·
IF 4.6
Jianchun Niu,Shuomeng Zhang,Yunqi Li,Xiaoyu Li,Jialin Zhang,Shanfu Lu,Qinggang He
The operating temperature of modified Nafion membranes remains too low to satisfy the requirements for high-temperature proton exchange membrane fuel cells (HT-PEMFCs) because most can only operate well below 120 °C. In this article, we prepare a series of Nafion/SiO 2 composite membranes with different contents of doped silica nanoparticles by in situ growth of SiO 2 nanoparticles near the –SO 3 H group. The water dynamic change process and the functional properties of Nafion/SiO 2 composite membranes are studied and found to correlate well with structural parameters, such as crystallinity and average chain spacing. Also, microstructure information including the phase separation structure changes, structural complexity, and ion cluster fraction of Nafion/SiO 2 composite membranes at different temperatures are investigated using synchrotron-based in situ small angle X-ray scattering (SAXS). Differing from expectations, the amount of water in the Nafion/SiO 2 composite membranes may not be the decisive factor to maintain proton conductivity at relatively high temperatures. Instead, the complexity or connectivity of the proton transport channel may play a more important role in the effective proton transfer inside the composite membranes, which also provides valuable guidance and insight for the development of novel HT-PEM materials with well-designed ion transport pathways in the future.
研究领域:
材料科学
·
燃料电池研究
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 8
·期 1
·196-206
·
IF 10.733
Jialin Li,Fanzhe Bu,Chunyu Ru,Hao Jiang,Yuting Duan,Yinan Sun,Xingtong Pu,Lichao Shang,Xifang Li,Chengji Zhao
Conventional fillers have limitations on the modification of proton exchange membranes because of differences in the sizes and physicochemical properties of matrix molecules. Designing skeleton molecules is a vital way to address the limitations by enabling precise distribution in the matrix and inducing automatic nanoscale aggregation and separation of hydrophilic–hydrophobic phases. In this work, a novel SDF-PAEK polymer was synthesized with a rigid hydrophobic backbone, short high-density trifluoromethyl side chains and long flexible aliphatic pendant side chains as a skeleton molecule for the Nafion membrane. Due to the unique molecular interaction selectivity during the membrane formation process, SDF-PAEK automatically matches the Nafion molecular conformation by self-assembly. Combining an improved solution formulation and membrane-casting method, the degree of composition can therefore rise to 20%, which can effectively reduce the cost. Morphological studies show that there is a certain degree of bicontinuous phase microcrystalline domains, and the proton transport channels are highly concentrated. In contrast to the Nafion membrane, SDF-PAEK@Nafion-15% exhibits better performances with higher selectivity (9.73 × 104 S s cm−3) and single-cell maximum power density (PDmax–139 mW cm−2, at 80 °C), which demonstrates the feasibility of SDF-PAEK as a novel PEM skeleton molecule for fuel cell applications.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Zhen Li,Xiaofeng Hao,Geng Cheng,Sheng Huang,Dongmei Han,Min Xiao,Shuanjin Wang,Yuezhong Meng
Polyhedral oligomeric silsesquioxane (POSS) has attracted increasing attention because of its organic/inorganic, nanosize, easily functional nature, especially in the applications of direct methanol fuel cells (DMFCs). In this work, we have successfully synthesized a novel bifunctional POSS ( Vi -POSS-SO 3 Na) with vinyl and sulfonic acid groups by thiol-ene click reaction. Vi -POSS-SO 3 Na was introduced into Nafion® matrix and cross-linked by in-situ simply thermal treatment. The implantation of the bifunctional POSS filler gives significant improvements in the performance of such proton exchange membranes (PEMs). The cross-linked hybrid membrane with 12 wt% of Vi -POSS-SO 3 Na ( X -Nafion@POSS-12) has a high proton conductivity (121 mS cm −1 ) at 80 °C, excellent dimensional stability and the lowest methanol permeability (5.4 × 10 −8 cm 2 s −1 ). The highest power density of the DMFCs was obtained by using the X -Nafion@POSS-12 as PEM in DMFC at 80 °C, and its value (34.93 mW cm −2 ) is twice higher than that of Nafion 212 membrane (14.90 mW cm −2 ). The novel in-situ fabrication method gives a simple and potential approach for the preparation of PEMs used in DMFCs.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2018
·
IF 6.945
Jing Gao,Chunshui Sun,Lei Xu,Jian Chen,Chong Wang,Decai Guo,Hao Chen
Due to flexible property and light weight, the lithiated Nafion membrane swollen with PC (PC-Li-Nafion) has been employed as both solid-state electrolyte and separator to fabricate solid-state Li-S cells. The electrochemical measurements of PC-Li-Nafion membrane show that its Li-ion transference number is 0.928, ionic conductivity of 2.1 × 10 −4 S cm −1 can be achieved at 70 °C and its electrochemical window is 0 ∼ +4.1 V vs. Li + /Li. It is observed that the Li dendrites are suppressed by using PC-Li-Nafion membrane due to its single-ion conducting property. The amounts of Li-Nafion resin binder and conductive carbon in the cathode are optimized as 40% and 10% respectively to make a balance of ionic and electronic conductivities . A thin-layer Li-Nafion resin with a thickness of around 2 μm is fabricated between the cathode and PC-Li-Nafion membrane to improve the interfacial contact and further enhance the specific capacity of the cell. When measured at 70 °C, the Li-S cell delivers a reversible specific capacity of 1072.8 mAh g −1 (S) at 0.05 C and 895 mAh g −1 (S) at 1 C. The capacity retention at 1 C is 89% after 100 cycles. These results suggest that high-performance solid-state Li-S cells can be fabricated with the Li-Nafion polymer electrolyte .
研究领域:
电化学
·
能源材料
·
固态电池
·
聚合物电解质
·
锂离子电池
·
电极界面工程
·
储能技术
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2010
·
IF 3.945
Lidan Lou,Hongting Pu
Vinyl functionalized hollow silica spheres (HSSs) were prepared via a template method and surface modification thereafter. Poly(vinylbenzyl phosphonic acid) (PVBPA) grafted HSSs (HPSSs) were prepared via emulsion polymerization of diisopropyl p-vinylbenzyl phosphonate (DIPVBP) on the surface of HSSs, and hydrolysis thereafter. The chemical structure and morphology of HPSSs were characterized by FTIR and TEM. A series of proton exchange membranes based-on Nafion ® 212 and HPSSs were prepared via solution casting . The water uptake, swelling ratio, mechanical properties , thermal behavior, proton conductivity , and chemical oxidative stability of the composite membranes were investigated. The addition of HPSSs in Nafion ® membranes can improve the water retentivity of the composite membranes. The composite membranes with HPSSs exhibit higher water uptake and proton conductivity than that of the recast Nafion ® membranes. The water uptake and the proton conductivity of the composite membranes increase with increasing HPSSs loading. With the higher water retentivity, the membranes exhibit high proton conductivity at high temperature (1.6 × 10 −1 S cm −1 at 125 °C).
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Biomaterials Science & Engineering
·
2021
·
IF 4.749
Wei Xu,Marwan Sakran,Jianwen Fei,Xiaoyun Li,Chenyuan Weng,Wei Yang,Guomin Zhu,Wanying Zhu,Xuemin Zhou
Hydrogen peroxide (H2O2) has been reported to mediate a variety of physiological and pathological processes in living systems. In this work, a biosensor for determination of H2O2 was prepared by using an HRP/Ti3C2/Nafion film-modified glassy carbon electrode (GCE). Ti3C2 nanosheets with remarkable conductivity and high specific surface area were chosen as carriers for HRP. Moreover, this biosensor modified with HRP has a specific catalytic effect on H2O2. The difference in peak current could reflect the quantitative change of H2O2. The linear range of the biosensor is 5–8000 μM, and the detection limit is 1 μM (S/N = 3). This biosensor was used to detect H2O2 in clinical serum samples of normal controls and patients with acute myocardial infarction (AMI) before and after percutaneous coronary intervention (PCI). The results showed that the difference between normal controls and patients is significant (P < 0.05), as well as the difference for patients before and after PCI (P < 0.01), but no significant difference existed between postoperative patients and normal controls. This biosensor has the advantages of simple preparation, high sensitivity, and quick detection, showing potential application in clinical diagnosis.
研究领域:
生物化学
·
医学诊断
·
电化学传感
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）