ANALYST
·
2015
·Vol. 141
·期 3
·1077-1082
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IF 4.107
Xiuyun Wang,Min Xi,Mengmeng Guo,Fangmeng Sheng,Guang Xiao,Shuo Wu,Shunichi Uchiyama,Hiroaki Matsuura
In this contribution, a very simple and reliable strategy based on the easy modification of a glassy carbon electrode (GCE) by pre-electrolyzing GCE in ammonium carbamate aqueous solution was employed for the simultaneous determination of hydroquinone (HQ) and catechol (CC). Compared with bare GCE, the incorporation of nitrogen into the GCE surface structure improved the electrocatalytic properties of GCE towards the electro-oxidation of HQ and CC. The nitrogen-introduced GCE (N-GCE) was evaluated for the simultaneous detection of HQ and CC and the linear ranges for HQ and CC were both from 5 to 260 μM. Their detection limits were both evaluated to be 0.2 μM (S/N = 3). The present method was applied for the determination of HQ and CC in real river water samples with recoveries of 95.0–102.1%. In addition, a possible detection mechanism of HQ and CC was discussed.
研究领域:
电化学
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分析化学
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环境科学
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DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2014
·
IF 2.235
Qi Sun,Cong Zhang,Huan Sun,Hui Zhang
Novel porous magadiite/Al-magadiite heterostructures (PMH/PAMH) and aluminated derivatives of PMH (xAl-PMH, x = Al/Si in feeding) were fabricated upon two-dimensional interlayer cosurfactant-directing TEOS hydrolysis–condensation–polymerization from synthetic Na-magadiite/Na-[Al]magadiite and postgrafting of Al into the interlayer silica framework of PMH from NaAlO2 precursor, respectively. Characterization studies indicate that PMH and PAMH possess high surface area (SA), high thermal stability, and unique supermicro–mesoporous structure upon effective assembly of interlayer mesostructured silica and clay layers but weak Lewis acidity. The xAl-PMH (x = 0.2, 0.4) samples show successful incorporation of Al into interlayer mesostructure of PMH mainly in tetra-coordinated form, leading to greatly increased Lewis acidity and newly created Brønsted acidity together with well-kept layered supermicro-mesoporous porosity and reduced SA (>280 m2/g) while 0.6Al-PMH shows collapsed layers. 0.4Al-PMH exhibits the highest liquid-phase Friedel–Crafts tert-butylation activity of catechol with 93.4% conversion and 80.4% 4-tert-butylcatechol selectivity due to the strongest synergy between the surface acidity and supermicro–mesostructure.
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DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 41
·34096-34102
·
IF 3.289
Wen-Ze Qiu,Yan Lv,Yong Du,Hao-Cheng Yang,Zhi-Kang Xu
High performance nanofiltration (NF) membranes are facilely fabricated via the co-deposition of catechol (CCh) and polyethylenimine (PEI) on the surface of a polysulfone (PSf) ultrafiltration membrane, with subsequent cross-linking by glutaraldehyde (GA). The surface properties of the studied membranes have been investigated in detail by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, scanning election microscopy, atomic force microscopy, zeta potential, and water contact angle. The NF performance of the membranes are dependent on the CCh/PEI ratio, co-deposition time and cross-linking condition. Results reveal that the optimum membrane yields a rejection of 88% and a permeation flux of 25 L m−2 h−1 when filtrating the 1000 mg L−1 MgCl2 solution at 0.6 MPa. And the negatively charged membrane surface is related to the following salt rejection sequence: MgSO4 > Na2SO4 > MgCl2 > CaCl2 > NaCl. Meanwhile, the membranes show excellent operation stability during a 240 h consistent filtration test.
研究领域:
材料科学
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环境工程
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DOI
高影响因子
CHEMICAL PAPERS
·
2022
·Vol. 76
·期 10
·6323-6333
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IF 2.146
Li Yan,Wu Tingxia,Song Lingyu,Zhu Yongbao,Chen Yizhe,Huang Yufu,Tang Junping,Cheng Kai,Lin Donghai,Chen Guosong
Natural graphite has a large electrical conductivity in plane direction, hundreds times of that in vertical direction. Regulating graphite flakes perpendicular to the plane will improve the performance of the sensor. As a non-connected method, magnetic field-assisted orientation can be no-additives. However, some studies believe that diamagnetic materials are non-magnetic, and must be doped by ferromagnetic materials before oriented by a magnetic field. Here, original graphite flakes were vertically oriented by a low magnetic field during the electrode preparation to increase effective surface area. The performance of electrode was enhanced in both potassium ferricyanide/potassium ferrocyanide probe system and detection of hydroquinone (HQ) and catechol (CC). For HQ and CC detection, the sensitivities of vertically oriented graphite flakes electrode are 5.05 times and 6.35 times higher than that of graphite flakes without magnetic field, respectively. This magnetic alignment technology could construct other electrode materials for electrochemical sensors.
研究领域:
材料科学
·
电化学传感器
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DOI
高影响因子
ACS Applied Polymer Materials
·
2022
·
IF 4.855
Cheng-yuan Feng,Hai-jun Chen,Meng-yao Yang,Zhe-sheng Feng,Yan Wang
An economical and efficient strategy for fabricating high-performance metallic copper layers on polyphenylene sulfide (PPS) for high-frequency microwave applications via mussel-inspired surface modification and electroless copper plating (ECP) is illustrated in this paper. Through UV-induced surface modification of catechol (CA)/polyamine (PA), the modified PPS substrate is capable of adsorbing silver particles, which provides activation sites for subsequent ECP. The impact of CA/PA modification on the relationship between PPS and the deposited copper layer can be determined by water contact angle measurements, X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and tape peel tests. The involvement of CA/PA has successfully introduced the functional groups for chemical bonding on the PPS surface, which greatly improves the adhesion between the PPS and the deposited copper layer. Moreover, after 40 min of ECP, the produced copper layer exhibits good adhesion at the 5B level (according to the ASTM D3559) and an excellent conductivity of 0.37 S/m (approx. 62% of bulk copper). Meanwhile, the deposited copper layer also has good resistance to acid, alkali, and salt corrosion (less than 25 g/m2 per unit area weight loss after 60 h of corrosion). This approach opens up an efficient path for the surface metallization of PPS, which has a broad potential for application in high-frequency copper-clad laminates (CCLs).
研究领域:
材料科学
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化学工程
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DOI
高影响因子
MACROMOLECULAR MATERIALS AND ENGINEERING
·
2022
·Vol. 307
·期 4
·2100824
·
IF 4.402
Zhi Li,Shujun Zhao,Huiwen Pang,Yi Sun,Shifeng Zhang,Yanglun Yu
Functional cationic waterborne polyurethanes (CWPUs) with environmental friendliness and excellent mechanical properties are widely desired in the materials industry. However, traditional modification methods such as molecular structure adjustment, crosslinking modification, and physical filling for polyurethane are overly complex and do not typically improve mechanical properties to the point of satisfying the stringent requirements for modern industrial materials. In this study, phenolic acid 3,4-dihydroxybenzoic acid with a catechol structure is applied to neutralize the tertiary ammonium structure on the side chain of polyurethane for the facile preparation of CWPU materials. The effects of this neutralizer on the microstructure, mechanical properties, and functional performance of CWPU samples (e.g., antibacterial, ultraviolet protection, coating properties) are systematically investigated. The results indicate that the catechol structures of the neutralizer provide abundant hydrogen bonding reaction sites, which greatly improves the mechanical properties of the CWPU films with the maximum strength of 43 MPa and simultaneously 1241% elongation at break. Furthermore, catechol structure and cationic attribute endow the CWPUs with excellent adhesion to various substrates, strong ultraviolet protection performance, and antibacterial ability. The proposed approach can be used to prepare robust CWPUs with strong functional performance as highly effective, environmental-friendly materials over a large scale.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
Materials Today Bio
·
2022
·
IF 10.761
Zunhan Hu,Wenzhen Wu,Meizhe Yu,Zhi Wang,Zhenyu Yang,Xiaodong Xing,Xiaofang Chen,Lina Niu,Fan Yu,Yuhong Xiao,Jihua Chen
Mussels can form tough and long-lasting adhesions to organic and inorganic surfaces in saline and impactive severe aquatic environments. Similar to mussel adhesion, dentin bonding occurs in a wet environment. However, unlike mussels, it is difficult to achieve long-lasting bonds with dentin. Moreover, water is considered a major hindrance in dentin bonding. Inspired by the synergistic effect of cationic lysine (Lys) and catechol on the elimination of the hydration layer during mussel adhesion, a catechol- and Lys-functionalized polymerizable polymer (catechol–Lys–methacrylate [CLM]) was synthesized to replicate the complex synergy between amino acids and catechol. The bond-promoting potential of 5 mg/mL CLM primer was confirmed using an in vitro wet dentin-bonding model, which was characterized by an improvement in bond strength and durability. CLM can adhere to wet demineralized dentin, with Lys acting as a molecular vanguard to expel water. Subsequently, a myriad of interfacial interactions can be obtained by introducing the catechol group into the interface. Additionally, tough and long-lasting adhesion, similar to that formed by mussels, can be achieved by grafting CLM onto type I collagen via covalent bonds, hydrogen bonds, Van der Waals interactions, and cation–π interactions, which can enhance the mechanical and chemical stability of collagen, increase the enzymatic resistance of collagen, and provide additional physical/chemical adhesion to dentin bonds. Catechol- and cationic Lys-functionalized polymers can improve the stability of the resin–dentin interface under wet conditions.
研究领域:
牙科材料
·
仿生材料
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聚合物科学
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牙科粘接
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DOI
PubMed
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 37
·23762-23768
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IF 4.036
Guofang Wang,Siyi Zhang,Qinyu Wu,Jingzhi Zhu,Suhua Chen,Yuanyuan Lei,Yanmei Li,Haomin Yi,Liyin Chen,Zi-Qi Shi,Yi Xiao
Simple, rapid and sensitive analysis of drug-derived pollutants is critically valuable for environmental monitoring. Here, taking acetaminophen, hydroquinone and catechol as a study example, a sensor based on an ITO/APTES/r-GO@Au electrode was developed for separate and simultaneous determination of phenolic pollutants. ITO electrodes that are modified with 3-aminopropyltriethoxysilane (APTES), graphene (GO) and Au nanoparticles (Au NPs) can significantly enhance the electronic transport of phenolic pollutants at the electrode surface. The redox mechanisms of phenolic pollutants include the electron transfer with the enhancement of r-GO@Au. The modified ITO electrode exhibits excellent electrical properties to phenolic pollutants and a good linear relationship between ECL intensity and the concentration of phenolic pollutants, with a limit of detection of 0.82, 1.41 and 1.95 μM, respectively. The separate and simultaneous determination of AP, CC and HQ is feasible with the ITO/APTES/r-GO@Au electrode. The sensor shows great promise as a low-lost, sensitive, and rapid method for simultaneous determination of drug-derived pollutants.
研究领域:
环境科学
·
分析化学
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DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Ningning Xing,Yangsai Lyu,Jia Li,Dickon H.L. Ng,Xiaolei Zhang,Weilin Zhao
Micro/nanomotors that combine the miniaturization and autonomous motion have attracted much research interest for environmental monitoring and water remediation . However, it is still challenging to develop a facile route to produce bifunctional micromotors that can simultaneously detect and remove organic pollutants from water. Herein, we developed a novel Janus micromotor with robust peroxide-like activity for simultaneously colorimetric detection and removal of catechol from water. Such laccase (Lac) functionalized Janus micromotor consisted of calcined MgAl-layered double hydroxides (MgAl-CLDHs) nanosheets and Co 3 O 4 -C nanoparticles (Lac-MgAl-CLDHs/Co 3 O 4 -C), revealing unique 3D hierarchical microstructure with highly exposed active sites. The obtained Janus micromotors exhibited autonomous motion with a maximum velocity of 171.83 ± 4.07 µm/s in the presence of 7 wt% H 2 O 2 via a chemical propulsion mechanism based on the decomposition of H 2 O 2 by Co 3 O 4 -C layer on the hemisphere surface of Janus micromotors. Owing to the combination of autonomous motion and high peroxide-like activity, Lac-MgAl-CLDHs/Co 3 O 4 -C Janus micromotors could sensitively detect catechol with the limit of detection of 0.24 μM. In addition, such Janus micromotors also could quickly degrade catechol by •OH generated from a Fenton-like reaction. It is a first step towards using autonomous micromotors for highly selective, sensitive, and facile detection and quick removal of catechol from water.
研究领域:
环境科学
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纳米技术
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分析化学
·
水处理
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DOI
PubMed
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2021
·
IF 4.158
Lixuan Ren,Yanzhen Zhao,Liu Yang,Wenling Cao,Huifang Wang,Xiaojie Lian,Xianghua Gao,Baolong Niu,Wenfeng Li
The bacterial infection is one of the main reasons for the failure of implant surgery. In this paper, catechol functionalized chitosan (CSCT) was used as a reducing agent and stabilizer to synthesize CSCT-Ag NPs. The composite coating of titanium surface was then electrodeposited by a CSCT layer initially, followed by spin-coating of a CSCT/gelatin (G)/CSCT-Ag NPs layer. The results of XRD , UV–Vis, and TEM showed that the silver nanoparticles were successfully synthesized with uniform distribution, and the particle size was 4–22 nm. The cytotoxicity test results of CSCT-Ag NPs on A549 and EA.Hy926 cells showed when the concentration of CSCT-Ag NPs was less than 25 μg/mL, the survival rate of the two kinds of cells was greater than 80%. First electrodeposition and then spin-coating is feasible through the coating adhesion test and the adhesion level up to 5B. Compared with the pure Ti substrate, the corrosion resistance and hydrophilicity of the composite coating surface are significantly improved. The antibacterial rate of the composite coating against E. coli and S. aureus can reach 99% and 96%. In conclusion, CSCT-Ag NPs and the method of preparing coatings by electrodeposition and then spin-coating have good clinical application potential.
研究领域:
材料科学
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生物医学工程
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纳米技术
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表面化学
·
生物材料
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Xian-En Zhao,Ya-Nan Zuo,Yinghui Xia,Jing Sun,Shuyun Zhu,Guobao Xu
Although fluorescent nanozymes exhibit great potential in sensing fields, few current nanozyme-based sensors are designed to discriminate catechol (CC) from its two isomers. Herein, fluorescent metal-organic framework (MOF)-based nanozyme is utilized for ratiometric and selective detection of CC without the interferences of hydroquinone (HQ) and resorcinol (RC). NH 2 -Cu-MOF plays multiple roles: (1) it exhibits excellent photoluminescence at 435 nm owing to the 2-amino-1,4-benzenedicarboxylic acid ligand; (2) Cu 2+ imparts MOF oxidase activity to trigger the oxidation of o -phenylenediamine (OPD) into luminescent products (oxOPD) with emissive peak at 571 nm, which quenches the intrinsic fluorescence of NH 2 -Cu-MOF (435 nm) through inner filter effect (IFE); (3) Cu 2+ can complex with CC specifically to produce complex containing o -semiquinone, which not only inhibits MOF’s oxidase-like activity but also quenches the fluorescence of MOF. Therefore, the presence of CC induces the decrease of fluorescence at 571 nm followed by the slight recovery of fluorescence at 435 nm. Notably, HQ and RC have negligible influences on the fluorescence of NH 2 -Cu-MOFs/OPD system. Based on these facts, a ratiometric fluorescence platform for CC has been constructed. It exhibits high sensitivity towards CC with LOD of 0.1 μM.
研究领域:
分析化学
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生物传感
·
材料科学
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DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2024
·
IF 4.1
Feng Wen-Jun,Wu Yan-He,Liu Xiao-Yang,Wang Zheng-Ke
Shear-thinning hydrogels have emerged for endoscopic submucosal dissection, while wound intervention after surgery has rarely been mentioned. Herein, a catechol-modified chitosan hydrogel with shear-thinning property was developed for simultaneously facilitating endoscopic submucosal dissection and postoperative wound healing. Benefiting from the shear-thinning and self-healing characteristics, the asprepared hydrogel showed easily endoscopic injectability. It also performed very well as submucosal cushion, which could remain above 70% after injection for 120 min in ex vivo porcine large intestine model. In fact, the cushion height of normal saline dramatically decreased to 46% of the initial height at 30 min. Ag nanoparticles encapsulated into the network endowed the hydrogel with almost reached 100% antibacterial effect against E. coli and S. aureus . The hemolysis ratio of the hydrogel was calculated to be as low as 0.8%. Combined with good hemocompatibility and cytocompatibility, the as-prepared hydrogel displayed much higher in vivo wound closure and healing efficacy than normal saline. These results demonstrated the superiority of the shear-thinning chitosan hydrogel in facilitating clinical endoscopic submucosal dissection surgery.
研究领域:
生物材料学
·
医学工程
·
药剂学
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DOI
高影响因子
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