SENSORS
·
2018
·Vol. 18
·期 10
·3358
·
IF 2.475
Xuemei Wu,Xiaoqing Bai,Yang Ma,Jie Wei,Juan Peng,Keren Shi,Huiqin Yao
In this work, binary hydrogel films based on carboxylated multi-walled carbon nanotubes/poly(N,N-diethylacrylamide) (c-MWCNTs/PDEA) were successfully polymerized and assembled on a glassy carbon (GC) electrode surface. The electroactive drug probes matrine and sophoridine in solution showed reversible thermal-, salt-, methanol- and pH-responsive switchable cyclic voltammetric (CV) behaviors at the film electrodes. The control experiments showed that the pH-responsive property of the system could be ascribed to the drug components of the solutions, whereas the thermal-, salt- and methanol-sensitive behaviors were attributed to the PDEA constituent of the films. The CV signals particularly, of matrine and sophoridine were significantly amplified by the electrocatalysis of c-MWCNTs in the films at 1.02 V and 0.91 V, respectively. Moreover, the addition of esterase, urease, ethyl butyrate, and urea to the solution also changed the pH of the system, and produced similar CV peaks as with dilution by HCl or NaOH. Based on these experiments, a 6-input/5-output logic gate system and 2-to-1 encoder were successfully constructed. The present system may lead to the development of novel types of molecular computing systems.Keywords:electrocatalysis;encoder;logic gate;matrine;sophoridine
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PubMed
高影响因子
Frontiers of Chemical Science and Engineering
·
2014
·Vol. 8
·期 3
·312-319
·
IF 0
Tan Ming,He Gaohong,Dai Yan,Wang Rujie,Shi Wenhua
The ternary phase diagrams of polyetherimide (PEI)/ N,N -dimethylacetamide (DMAc) with H 2 O and BuOH as non-solvent were simulated using solubility parameter and Flory-Huggins theory. The phase diagrams show that 5.5% H 2 O/BuOH system containing 5% BuOH and 0.5% H 2 O, or 6.5% H 2 O/BuOH system containing 6.2% BuOH and 0.3% H 2 O is required to induce liquid-liquid demixing for 20 wt-% PEI/DMAc casting solution. Therefore, BuOH can enhance the phase separation of the PEI casting solution and hereby induce higher porosity of the membrane, and the diffusion of BuOH into the water coagulation bath causes larger pore size easily compared with DMAc. Our predictions that the membrane pure water flux first increases then decreases, and the rejection ratio of bovine serum albumin decreases with the increasing concentration of BuOH were validated by the experiments using the prepared membranes.
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INORGANIC CHEMISTRY
·
2017
·
IF 4.857
Guang-Ning Liu,Xiao-Ming Jiang,Qing-Shun Fan,Muhammad Bilal Hussain,Ke Li,Hui Sun,Xin-Yu Li,Wan-Qing Liu,Cuncheng Li
In situ alkylation or protonation reactions on the thiazolyl-N donors of benzothiazole (btz) and its derivative 2-aminobenzothiazole (abtz) occurred to form four structure directing agents (SDAs), which feature different structure directing abilities and hydrophobicities. The thiazolyl-N alkylated and protonated btz cations direct to form an α-type (AgI2)− iodoargentate chain in (Etbtz)(AgI2) (1), (Prbtz)(AgI2) (2), and (Hbtz)(AgI2) (3), respectively, while the thiazolyl-N protonated abtz cation directs to form a new type of (Ag2I3)− anionic chain in (Habtz)(Ag2I3) (4). Compounds 1 and 4 represent the first noncentrosymmetric (NCS) hybrid iodoargentates with organic S-containing N-heterocycle derivative cations as SDAs. Further, 1 exhibits high water stability and is second harmonic generation (SHG) active with a response about twice that of KDP (KH2PO4). Importantly, the water stability studies indicate that hybrid iodoargentates with hydrophobic N-alkylated SDAs are more stable in water than those with relative hydrophilic N-protonated SDAs.
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PubMed
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 15
·7924-7931
·
IF 2.936
Yanling Wang,Yongfei Li,Qian Wang,Qiang Li,Yue Zhang,Lin Yuan
The wettability of a rock’s surface is a vital factor for gas flow and fracturing fluid backflow. As a result of this, novel and effective gas wetting alteration agents are required. In this work, a gas-wetting alteration agent, N,N-bis(perfluorooctyl)imine acetate sodium, was synthesized and characterized by different methods. The wettability of a rock’s surface was evaluated by contact angle and imbibition measurements, the Owens two-liquid method and glass capillary tube rise testing. The results showed that after treatment with 0.5 wt% N,N-bis(perfluorooctyl)imine acetate sodium the contact angles of water and n-hexadecane on the surface of the rock increased from 36° and 0° to 140° and 119°, respectively. The surface free energy rapidly reduced from primeval 72 mN m−1 to 3.4 mN m−1 after treatment with 0.3 wt% N,N-bis(perfluorooctyl)imine acetate sodium. These values agreed with the imbibition measurements and the results of the glass capillary tube rise testing. Moreover, analysis by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) showed that the roughness of the rock surface significantly increased. The above results fully proved that the wettability of the rock surface is altered from its original water-wetting or oil-wetting to gas-wetting. Furthermore, thermal analysis demonstrated that the gas-wetting alteration agent has good thermal stability, which indicates its great potential to be used as a gas-wetting alteration agent for unconventional gas reservoirs under high temperature conditions.
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高影响因子
Polymers
·
2024
·
IF 4.7
Jinyu Zhang,Dezhi Qu,Shuyu Wang,Shien Qi,Huajiang Zuo
In this study, polyacrylic acid hydrogels were prepared by modulating the cross-linking agent mass ratio using UV and heat curing methods. The structures and properties of the hydrogels were characterized and analyzed using Fourier transform infrared spectroscopy, scanning electron microscopy, and thermogravimetric analysis. The results showed that the mechanical properties of the hydrogels prepared through UV curing were better than those prepared through heat curing. The maximum mechanical tensile strength of 139 kPa was achieved at a cross-linking agent mass ratio of 3.85% with 20 min of UV curing, and the maximum mechanical compressive strength of 0.16 MPa was achieved at a cross-linking agent mass ratio of 2.91% with 20 min of UV curing. However, the hydrogels prepared by heat curing had a higher tensile strength than those prepared using the heat curing method. In addition, the thermally cured hydrogels had higher water absorption and adsorption properties. Moreover, the PAA hydrogels prepared at cross-linking agent mass ratios of 1.91 and 2.91% with 2 h of the heat curing method had the best swelling properties. Moreover, the increase in the cross-linker mass concentration led to a decrease in the pore size and porosity and to a more compact structure.
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PubMed
高影响因子
Catalysts
·
2025
·Vol. 15
·期 9
·850
·
IF 4
Qiongqiong He,Xuewen Wu,Ping Ma,Zhaoyang Song,Xiaoqi Wu,Ruize Gao,Zhenyong Miao
Phenol is a refractory organic pollutant that is difficult to degrade in wastewater treatment, and efficiently and stably degrading phenol presents a significant challenge. In this study, iron-doped humic acid-based nitrogen–carbon materials were prepared to activate peroxymonosulfate (PMS) for the degradation of phenol. The Fe-N-C/PMS system achieved a phenol degradation rate of 99.71%, which follows a first-order kinetic model, with the reaction rate constant of 0.1419 min−1. The phenol degradation rate remained above 92% in inorganic anions (Cl−, SO42−, HCO3−) and humic acid and the system maintained a 100% phenol removal rate over a wide pH range (3–9). The iron in the catalyst predominantly exists in the forms of Fe0and Fe3C, and Fe0, Fe2+/Fe3+are the main active sites that promote PMS activation during the reaction. Additionally, Fe-N-C has a large specific surface area (1041.36 m2/g). Quenching experiments and electron spin resonance (ESR) spectroscopy detected the active free radicals in the Fe-N-C/PMS system: SO4•−, •OH, O2•−, and1O2. The mechanism for phenol degradation was discussed, involving radical pathways (SO4•−, •OH, O2•−) and the non-radical pathway (1O2), in the Fe-N-C/PMS system activated by Fe0, Fe2+/Fe3+, sp2hybridized carbon, C-O/C-N, C=O, and graphitic nitrogen active sites. This study provides new insights into the synthesis of efficient carbon-based catalysts for phenol degradation and water remediation.
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高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2025
·
IF 2.2
Lijiao Ma,Yudong Ding,Yi Zhang,Xun Zhu,Hong Wang,Min Cheng,Qiang Liao
To reduce CO 2 emissions and address issues with conventional amine-based aqueous absorbents, a mixed nonaqueous solution of monoethanolamine (MEA) and N , N -dimethylformamide (DMF) was proposed. The density, dynamic viscosity and refractive index of fresh MEA-DMF solutions (10-50 wt% MEA) and CO 2 -loaded solutions (0.10–0.51 mol CO 2 ·(mol MEA) −1 ) were measured across the temperature range of 298.15–333.15 K. The values for fresh solutions were correlated with concentration and temperature using the Jouyban-Acree model (JAM) and an exponential equation. Then the results after CO 2 absorption were derived from the CO 2 loading amount. Additionally, CO 2 absorption performance of MEA-DMF with various concentrations at 303.15–333.15 K and 9.64–134.52 kPa was assessed to determine gas-liquid equilibrium and develop semi-empirical correlations. Nuclear magnetic resonance (NMR) analysis confirmed that carbamate was the primary product formed after CO 2 absorption in the nonaqueous absorbent. These studies provide essential data for equipment design and absorbent optimization. MEA-DMF solutions demonstrate favorable viscosity and CO 2 absorption performance, supporting the potential use of nonaqueous absorbents in industrial CO 2 capture technologies.
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高影响因子
PLoS One
·
2014
·Vol. 9
·期 7
·e102539
·
IF 3.534
Caili Dai,Zhihu Yan,Qing You,Mingyong Du,Mingwei Zhao
Through the descriptive and rheological characterization of worm-like micelles formed by N -hexadecyl- N -methylpyrrolidinium bromide and sodium laurate, the formation and properties of the worm-like micelles were affected by the concentrations of sodium laurate and temperature. Additionally, cryogenic transmission electron microscopy images further validated the formation of worm-like micelles.
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高影响因子
SOLVENT EXTRACTION AND ION EXCHANGE
·
2020
·
IF 1.988
Sherif M. Ibrahim,Yan Zhang,Yun Xue,Suliang Yang,Fuqiu Ma,Guoxin Tian
The extraction of Nd(III), Gd(III), and Er(III), which represent light, middle, and heavy lanthanides, respectively, from chloride solutions has been carried out by using N,N-di(2-ethylhexyl)-diglycolamic acid (HDEHDGA, HA) diluted in kerosene as the organic phase. The results from the slope analysis method indicate that the extraction of Ln(III) with HDEHDGA is mainly governed by the cation-exchange reaction mechanisms in the low pH region (pH 1.2–2.7). The obtained data reveal that the extracted species in the organic phase might be LnA3∙HA(1~2), which consist of a core of 1:3 LnA3 complex and one additional neutral HA molecule for light Ln(III) or two for heavy Ln(III) associated with the core in the outer coordination sphere. The dependency on the temperatures indicates that the extraction of Ln(III) with HDEHDGA is exothermic and is mainly driven by the exothermic enthalpies crossing the whole Ln(III) series. The extraction of the whole Ln(III) series (except for Pm(III)) and Th(IV) has also been evaluated. HDEHDGA provides remarkable extraction capability with considerable separation factors (SF) for adjacent light Ln(III) pairs (SFCe/La = 6.8, SFPr/Ce = 3.3, SFNd/Pr = 2.5, and SFSm/Nd = 3.5), but relatively poor selectivity for the adjacent heavy Ln(III) pairs. It also presents very good selectivity/extractability for Th(IV) over the light Ln(III) ions (SFTh/La = 1362 and SFTh/Ce = 200). These properties make HDEHDGA a promising extractant for separating Th(IV) from light Ln(III) ions and for separating light Ln(III) ions from each other, which coexist significantly in some Rare Earth (RE) minerals, especially monazite and bastnaesite.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Huimin Hao,Ji-Long Shi,Hui Xu,Xia Li,Xianjun Lang
TiO 2 is the most established semiconductor photocatalyst . The prominence of TiO 2 is becoming increasingly obvious because its interfacial redox reactions have implication on a wide range processes such as energy conversion and environmental remediation. Herein, we exploited the surface complex created by the interaction between organic molecules with binding sites and accommodating surface of TiO 2 for visible light-driven selective aerobic oxidation reactions. A novel surface complex formed between N -hydroxyphthalimide (NHPI) and TiO 2 was discovered. The NHPI-TiO 2 complex turned out to be an outstanding visible light photocatalyst and was successfully used in the selective oxidation of amines into imines with atmosphere O 2 under blue LED irradiation. The stability of the NHPI-TiO 2 complex was preserved by 3 mol% of (2,2,6,6-tetramethylpiperidin-1-yl)oxyl (TEMPO) acting as a cooperative catalyst. Moreover, selectivities for the imine products were also promoted by TEMPO. Superoxide anion radical (O 2 − ) were evidenced to be the primary reactive oxygen species (ROS) to execute the oxidative conversions. This work suggests that TiO 2 surface complexes can be robust photocatalysts for visible light-driven selective aerobic reactions, provided that an appropriate cooperative redox catalyst exists to channel the photocatalytic electron transfer.
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高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2014
·Vol. 16
·期 7
·1-12
·
IF 2.278
Zhao Lianhong,Yan Xiufang,Jie Zhiqiang,Yang Hong,Yang Shiping,Liang Jie
Regenerable antimicrobial N -halamine/silica hybrid nanoparticles (NPs) containing chlorinated 5,5-dimethylhydantoinyl (Cl-DMH) groups, Cl-DMH/SiO 2 hybrid NPs, have been prepared by a co-condensation reaction between N -(3-triethoxysilylpropyl)-5,5-dimethylhydantoin (TS-DMH) and tetraethoxysilane (TEOS) and then a chlorination reaction in NaClO solution. The as-synthesized Cl-DMH/SiO 2 NPs were characterized by transmission electron microscopy, Scanning electron microscopy, X-ray photoelectron spectra, Specific surface area, Differential scanning calorimetry, and Fourier transform infrared. Experimental results showed that the size of the as-synthesized Cl-DMH/SiO 2 NPs could be well adjusted by changing the mass ratio of TS-DMH/TEOS and the volume ratio of 28 % NH 4 OH/H 2 O. Antimicrobial tests showed that the as-prepared Cl-DMH/SiO 2 hybrid NPs had excellent antimicrobial activities against both Escherichia coli and Staphylococcus aureus . The minimum inhibitory concentration and minimum bactericidal concentration values of the as-prepared Cl-DMH/SiO 2 hybrid NPs are 15 and 20 μg/mL for S. aureus , 25 and 30 μg/mL for E. coli , respectively. Paper disk diffusion assay showed that smaller-sized Cl-DMH/SiO 2 hybrid NPs have bigger inhibition zone diameters, indicating stronger antimicrobial efficacies. Also, the storage stability and regenerability of Cl-DMH/SiO 2 hybrid NPs were investigated.
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高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2020
·
IF 3.333
Lin Chen,Shuangshuang Wang,Yingying Zhang,Yuchao Li,Xiangcai Ge,Guang Li,Liping Wang
In this work, N-hydroxyphthalimide (NHPI) was used as catalyst to cleave C H bonds in polyethylene glycol (PEG) backbones to generate carbon free radicals that reacted with the N N bonds of di-tert-butyl azodicarboxylate (DBAD) to form C N grafts (PEG-g-DBAD). Subsequently, the tert-butoxycarbonyl (-Boc) groups of PEG-g-DBAD were removed by treating with trifluoroacetic acid (TFA) to obtain hydrazino functionalized PEG (PEG-g-NHNH 2 ). The structure of functionalized PEG was confirmed by Fourier transform infrared spectroscopy (FTIR), 1 H nuclear magnetic resonance spectroscopy ( 1 H NMR), elemental analysis and size exclusion chromatography (SEC). Thermal gravimetric analysis (TGA) and differential scanning calorimetry (DSC) were applied to investigate thermal stability and crystallization properties of the functionalized PEG. The synthesized PEG-g-NHNH 2 could be used to toughen epoxy resin (EP). The results of mechanical testing and SEM images indicated that the compatibility between PEG backbones and EP has been improved due to the existing of hydrazino groups . The grafted hydrazine groups could also react with 2-bromoisobutyryl bromide (BIBB) to obtain PEG-g-BIBB which initiated the polymerization of (methyl) methacrylate (MMA) by ARGET-ATRP. Thus, we presented a methodology with high efficiency for hydrazination of PEG under mild condition, and the functionalized PEG might have many potential applications.
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