MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 10
·3747-3753
·
IF 4.58
Jia Haiyan,Yang Taotao,Zuo Yinxiu,Wang Wenmin,Xu Jingkun,Lu Limin,Li Ping
The authors describe a voltammetric immunosensor with antibody immobilized on a glassy carbon electrode (GCE) modified with N-doped graphene (N-GS), electrodeposited gold nanoparticles (AuNPs) and chitosan (Chit). The preparation is simple and the thickness of the electrodeposited films can be well controlled. Due to the specific advantages of N-GS, AuNPs and Chit, the electrode has a large specific surface, improved conductivity, high stability. A new label-free immunosensor for the model antigen (alpha fetoprotein, AFP) detection was then designed by employing N-GS-AuNP-Chit as the antibody immobilization and signal amplification platform. Differential pulse voltammetry and electrochemical impedance spectroscopy were used for the characterization of the stepwise assembly process. Under the optimized conditions, at a typical working potential of +0.20 V (vs. SCE), and by using hexacyanoferrate as an electrochemical probe, the immunosensor has a detection limit as low as 1.6 pg mL −1 and a linear analytical range that extends from 5 pg mL −1 to 50 ng mL −1 . AFP was quantified in spiked human serum samples with acceptable precision.
Schematic of sensitive and effective label-free electrochemical immunosensor for the detection of AFP based on N-GS-AuNP-Chit as signal amplification matrix.
研究领域:
生物医学工程
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分析化学
·
电化学
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DOI
高影响因子
TEXTILE RESEARCH JOURNAL
·
2018
·
IF 1.54
Xue Zhao
Three azo dyes were synthesized using N-butyl substituted phthalimides as diazo components. All of the synthesized intermediate derivatives and dyes were characterized by mass spectrometry, proton nuclear magnetic resonance, infrared (IR) and elemental analyses. Synthesized dyes were also evaluated for their dyeing behavior and fastness properties toward polyester fabric. The ultraviolet-visible absorption maxima of the dyes were observed in the range of 445–563 nm. Bromo and cyano substitutions at the 3- and/or 5- positions of the phthalimide ring resulted in hypsochromic and bathochromic shifts, respectively. IR spectra peaks at 1770 and 1395 cm−1 of hydrolyzed dye showed that C–O groups appeared under relatively mild alkaline conditions. The K/S values of dyed polyester/elastane fabrics decreased obviously as the pH value increased. Hydrolysis of the phthalimide ring was found to be largely influenced by steric effects rather than inductive effects. Bromo substituted dyes have the lowest rates of hydrolysis. Compared with S-type dyeing disperse dyes, phthalimide dyes have lower dyeing rates and lower levelness of dye migration. The ωB97XD/6-311G(d,p) calculation found that pi-stacking interactions of phthalimide–benzene and phthalimide–phthalimide dimers increased the dye–fiber and dye–dye interactions.
研究领域:
染料化学
·
纺织科学
·
有机化学
·
材料科学
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DOI
高影响因子
Environmental Science-Advances
·
2023
·Vol. 2
·期 5
·731-739
·
IF 0
Wen Wen,Yina Liu,Zhongping Li,Guangming Wen,Hung-Wing Li,Li Li
In this study, we report a simple pyrolytic strategy for N–C co-doped Fe-based nanoparticles (Fe–N–C) and exhibit their oxidase-mimicking and peroxidase-mimicking activity in a chromogenic reaction with 3,3′,5,5′-tetramethylbenzidine dihydrochloride (TMB) as a substrate. Structural analysis revealed that Fe–NX and Fe3C structures were formed with Fe-Imace coordination compounds as precursors and melamine as the nitrogen source, which provided abundant active sites for the Fe–N–C nanozyme. Interestingly, owing to the blocking effect triggered by π–π stacking between the tetracycline antibiotics (TCs) tetraphenyl skeleton and Fe–N–C, the substrate affinity of the Fe–N–C was significantly blocked, resulting in the solution fading. Under the optimum conditions, the UV absorption intensity versus the concentration of TCs was found to be linear over the range of 0.08–90 μM for tetracycline (TC), 0.1–80 μM for chlortetracycline (CTC) and 0.09–100 μM for oxytetracycline (OTC). The detection limits were 62 nM for TC, 85 nM for CTC and 88 nM for OTC. The Fe–N–C displayed good storage and long-term stability when stored at 4 °C for 30 days. In addition, based on its superparamagnetism, Fe–N–C can be effectively recycled and reused through an external magnetic field, avoiding secondary pollution.
研究领域:
分析化学
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生物医学工程
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环境科学
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DOI
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Zhijia Liao,Zhenyu Yuan,Hongliang Gao,Fanli Meng
In this study, porous sheet-like nanostructured Co 3 O 4 -CuO-CuOHF composites with great n-butanol sensing properties were synthesized by the biotemplate method and hydrothermal method . The effect of various contents of Co 3 O 4 -CuO-CuOHF sensor performance was systematically investigated, in which the best performance was achieved for the composite with 0.03 g Co 3 O 4 addition. The response of the best content Co 3 O 4 -CuO-CuOHF composite sensor to 100 ppm n-butanol at 180 ℃ is 120, which is 8 times higher than that of the CuO-CuOHF sensor. The composite sensor has excellent selectivity for n-butanol and responds 3.75–25 times higher to n-butanol than other target gases. It is detectable up to 500 ppb n-butanol and has potential promise for low concentration detection. Furthermore, it has outstanding stability and resistance to humidity. The gas sensing mechanism was analyzed by UV–visible diffuse reflectance spectroscopy, EPR oxygen vacancies and X-ray photoelectron spectroscopy, which indicated that the abundant oxygen vacancies , the physical adsorption of polar hydroxyl bonds, the electronegative fluorine substitution and the special microstructure of the composite contributed to its gas-sensitive performance.
研究领域:
材料科学
·
纳米科技
·
传感器技术
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表面化学
·
功能材料
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DOI
高影响因子
GREEN CHEMISTRY
·
2015
·Vol. 18
·期 6
·1731-1737
·
IF 8.02
Mengmeng Fan,Chunlin Zhu,Lin Liu,Qilu Wu,Qingli Hao,Jiazhi Yang,Dongping Sun
We have successfully prepared poly (3,4-ethylenedioxythiophene) (PEDOT)/N-doped reduced graphene oxide (N-rGO) by electrodeposition, post-reduction, and doping N atoms with a microorganism (as a green reagent) to modify PEDOT and resolve the exfoliation and fragmentation problems of pristine PEDOT. This modification greatly improves the electrochemical properties of PEDOT, showing great potential for a bio-electrode coating material, which should have excellent electrochemical properties, stability and biocompatibility. The as-prepared PEDOT/N-rGO shows lower impedance, and higher capacitive performance and cyclical stability than pristine PEDOT due to the doping of N-rGO. An MTT assay demonstrates this modified PEDOT has good adhesion, cell viability and proliferation, similar to pristine PEDOT. This indicates that the modification process does not restrain the good biocompatibility of pristine PEDOT, which results from the doping of highly biocompatible N-rGO by this green method. The wrinkled structure, residual oxygen containing functional groups and dopant N atoms of N-rGO lead to the formation of a fluctuating surface and an increase in the hydrophilicity of PEDOT, which increase the specific surface area and cell adhesion in cell culture, respectively. Consequently, this modified PEDOT improves the electrochemical properties, and resolves the exfoliation and fragmentation problems of pristine PEDOT, while still retaining the high biocompatibility of pristine PEDOT, which is promising for a bio-electrode coating material.
研究领域:
生物材料学
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电化学
·
生物医学工程
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Shaonian Hu,Daochuan Jiang,Lina Gu,Gengsheng Xu,Zhongjun Li,Yupeng Yuan
Achieving the excitation of lone pairs (n → π*) in graphitic carbon nitride (g-C 3 N 4 ) can not only extend visible light absorption range, but also increase the amount of catalytically active π electrons, thereby leading to enhanced photocatalytic hydrogen (H 2 ) generation. However, awakening n → π* electronic transition in g-C 3 N 4 is highly challenging. Here we report on activating n → π* electronic transition by breaking hydrogen bonds in g-C 3 N 4 through a post thermal annealing process. The g-C 3 N 4 thus obtained shows greatly increased photocatalytic H 2 generation under visible light irradiation. Under optimal conditions, the highest H 2 generation rate reached 33.3 μmol·h −1 , which is 25 times higher than that of pristine g-C 3 N 4 without n → π* electronic transition (1.3 μmol·h −1 ). Moreover, the longest wavelength that can photoexcite g-C 3 N 4 to generate H 2 is 510 nm, nearly a 50 nm red shift to the absorption edge of pristine g-C 3 N 4 (~460 nm). This work demonstrates a great potential of utilizing n → π* electronic transition to increase the photocatalytic performance of g-C 3 N 4 via breaking hydrogen bonds.
研究领域:
材料科学
·
光化学
·
催化
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DOI
高影响因子
CRYSTENGCOMM
·
2021
·Vol. 23
·期 25
·4549-4559
·
IF 3.545
Zongjian Liu,Zhicong Sun,Lin Zhang,Lifei Xu,Xinyue Lu,Qun Cui,Haiyan Wang
Hierarchical nanocrystal UiO-66 was synthesized by a template-free double solvent-modulated crystallization method. The influences of the ammonium hydroxide (NH4OH)/Zr and acetic acid (HAC)/Zr ratios and pH of reaction solution on the morphological and the porous properties of UiO-66 were investigated. The results show that the nanoscale grains of UiO-66 with the size of ∼20 nm and interparticle mesopores of ∼30 nm are obtained with the NH4OH/Zr of 0.96–3.84, HAC/Zr of 50 and the pH from 1.68 to 2.70. The introduction of NH4OH is favorable to the formation of Zr4+ oxo/hydroxo clusters and deprotonation of the ligands for accelerating the nucleation and crystallization, while HAC can effectively control the hydrolysis of zirconium chloride to avoid the formation of particles with low crystallinity. The equilibrium adsorption capacities of nHEP and MCH on UiO-66(2.88, 50) are higher than that on UiO-66-AS at 323–373 K, respectively. The effective diffusion coefficients of n-heptane/methyl cyclohexane on the hierarchical UiO-66 nanocrystals are about 5 and 18 times higher than that on microporous UiO-66 at 373 K and 0.05–6 kPa, respectively. The introduction of mesopores increases the adsorption performance of the adsorbent for alkanes and enhances mass transfer.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
International Journal of Extreme Manufacturing
·
2022
·Vol. 5
·期 1
·015502
·
IF 10.036
Zhibin Jiang,Lujie Jin,Xiying Jian,Jinxia Huang,Hongshuai Wang,Binhong Wu,Kang Wang,Ling Chen,Youyong Li,Xiang Liu,Weishan Li
Lithium-sulfur (Li-S) batteries can provide far higher energy density than currently commercialized lithium ion batteries, but challenges remain before it they are used in practice. One of the challenges is the shuttle effect that originates from soluble intermediates, like lithium polysulfides. To address this issue, we report a novel laminar composite, N,O-carboxymethyl chitosan-reduced graphene oxide (CC-rGO), which is manufactured via the self-assembly of CC onto GO and subsequent reduction of GO under an extreme condition of 1 Pa and −50 °C. The synthesized laminar CC-rGO composite is mixed with acetylene black (AB) and coated on a commercial polypropylene (PP) membrane, resulting in a separator (CC-rGO/AB/PP) that can not only completely suppress the polysulfides penetration, but also can accelerate the lithium ion transportation, providing a Li-S battery with excellent cyclic stability and rate capability. As confirmed by theoretic simulations, this unique feature of CC-rGO is attributed to its strong repulsive interaction to polysulfide anions and its benefit for fast lithium ion transportation through the paths paved by the heteroatoms in CC.
研究领域:
材料科学
·
能源存储技术
·
电化学
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DOI
高影响因子
Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 8
·4088-4101
·
IF 11.9
Tian Yu,Suiting Ning,Tingting Zhang,Xiangbin Chen,Qian Liu,Ning Qi,Zhiquan Chen,Xianli Su,Xinfeng Tang
As one kind of superionic conductor, CuAgSe is a promising thermoelectric material due to its extremely low thermal conductivity and high electron mobility. In this study, the electrical and thermal properties of CuAgSe were collaboratively optimized by changing the chemical composition. Seebeck coefficient measurements reveal that stoichiometric and CuAg-deficient CuAgSe materials show n–p transition with the increase of temperature. In contrast, the Se-deficient CuAgSe still shows n-type conduction in the α-phase at high temperatures. Positron annihilation measurements indicate that there are large amounts of cation vacancies such as Ag and Cu vacancies in the stoichiometric and CuAg-deficient samples, which provide a high concentration of hole carriers and are responsible for the n–p transition at high temperatures. The number of vacancies decreases gradually with increasing CuAg content, and in the Se-deficient CuAgSe, VAg–Se divacancies are formed, which further results in a sufficient decrease of hole carriers. As a result, the Se-deficient samples still show n-type conduction in the α phase. Our results indicate that vacancy defects are the key factors that determine the conduction type in CuAgSe, which can be tuned by the chemical composition. In addition, superb thermoelectric performance was achieved in both p-type and n-type CuAgSe, with maximum ZT of 0.96 at 573 K in (CuAg)0.96Se (p-type) and 0.55 at 630 K in (CuAg)1.02Se and (CuAg)1.04Se (n-type).
研究领域:
材料科学
·
热电学
·
固体物理学
✓ 已验证
DOI
高影响因子
Catalysts
·
2022
·Vol. 12
·期 6
·640
·
IF 4.501
Xu Lu,Chenhao Wei,Liang Zhao,Jinsen Gao,Chunming Xu
Coke formation on n-butene cracking catalyst is the main reason for the reducing of its lifetime. To study the effects of acidity and textural properties on the coke formation process, a series of HY zeolite-type catalysts were prepared by ammonium hexafluorosilicate treatment (AHFS). NH3-TPD and Py-IR-TPD were used to systematically study the change law of zeolite acidity. It was found that with the increase of AHFS concentration, the acid density decreased, whereas the ratio of Brønsted acid to Lewis acid first increased and then decreased. Meanwhile, the percentage of Brønsted acid inside the supper cages increased and the strength of Brønsted acid increased with the degree of dealumination. Combined with in situ IR study on coke formation, the relationship between coking and acid site was revealed. It was found that the rate of coke formation on zeolites was affected by acid density, which is the rate of coke formation decreased with the decline of acid density. When the acid density remains at the same level, it was the acid strength that determined the coke formation rate—the stronger the acid strength, the faster the coke formation rate.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Heng Mao,Shen-Hui Li,Ao-Shuai Zhang,Li-Hao Xu,Jiao-Jiao Lu,Zhi-Ping Zhao
With the help of density functional theory calculations, a unique MOF-capped nanotube architecture was initially conceived in this study based on the solution-diffusion mechanism. Then, the novel ZIF-8-capped halloysite nanotubes (ZHNTs) were prepared and incorporated in the polydimethylsiloxane (PDMS) bulk to achieve the mixed matrix membranes (MMMs) for n -butanol permselective pervaporation . The remarkable characteristic of this membrane was that the HNT lumen (∼25 nm) in ZHNTs provided the exquisite diffusion highway for the penetrants that were first selected through the capping ZIF-8 layer. Simultaneously, the close connection of ZIF-8 layer on external surface of ZHNTs created the relatively continuous pathways for molecular permeation. As expected, the embedding ZHNTs significantly improved the separation performances of the membranes. Impressively, the as-obtained membrane acquired a high separation factor of 61.3 (58.7% higher than that of PDMS control membrane) with a comparable flux of 683 g m -2 h -1 (2.43-fold as much as that of PDMS control membrane) at 40 °C in the separation of 1 wt% n -butanol aqueous solution. Moreover, the presence of ZHNTs conferred excellent interfacial compatibility, mechanical properties, and good long-term stability on the resultant membranes. This study may shed light on the rational design of high-performance MMMs for biofuels recovery from fermentation broths .
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Lichao Shang,Dan Yao,Bohao Pang,Chengji Zhao
It was reported that the existence of N-spirocyclic quaternary ammonium (QA) cation could improve alkaline stability of anion exchange membrane materials (AEM). Therefore, the cyclo-quaternization reaction with pyrrolidine (Pyr) and piperidine (Pip) was carried out to prepare quaternized poly (ether ether ketone)s bearing five-membered and six-membered N-spirocyclic quaternary ammonium (QA) groups in the phenyl side chains (QPEEK- spiro -pyr and QPEEK- spiro -pip), respectively. From the transmission electron microscope, the hydrophilic-hydrophobic phase-separated morphology was formed in QPEEK- spiro membranes after incorporating N-spirocyclic QA cations and bulky spacer simultaneously in the phenyl side chain. The effect of N-spirocyclic QA groups on performance of resulted AEMs was then studied in detail. The anion conductivities of QPEEK- spiro -pyr and QPEEK- spiro -pip in OH − form at 80 °C were 49.6 and 30.9 S cm −1 , respectively. The remaining proportions of hydroxide conductivity for QPEEK- spiro -pyr and QPEEK- spiro -pip membranes after immersing in 1 M NaOH at 60 °C were 81.0% and 74.7%, respectively, which were higher than that of 62.3% for QPEEK-TMA containing conventional QA groups in the phenyl side chain. Fuel cell assembled with QPEEK- spiro -pyr achieves a peak power density of 90 mW cm −2 . These results indicate the strategy of simultaneously introducing N-spirocyclic QA cations and bulky spacers can improve the performance of AEM to a certain extent. There are some other factors that influence the alkaline stability of the prepared AEMs, such as the existence of ether bonds in the main chain. However, this work still provides a valuable reference towards the molecular design of AEMs with improved performance.
研究领域:
材料科学
·
化学工程
·
能源科学
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DOI
高影响因子
危险品化学品经营许可证（带存储）