SYNTHETIC METALS
·
2018
·
IF 2.526
Junlong Niu,Liangmei Rao,Ping Liu,Wenwen Zhang,Wenna Zhang,Yinxiu Zuo,Keke Chai,Shuai Chen,Jingkun Xu,Xuemin Duan
Two novel chiral 3,4-dihydro-2 H -thieno[3,4- b ][1,4]dioxepine (ProDOT)-based electrochemical sensor , employing a pair of glassy carbon electrodes modified with chiral poly(2-Phenyl-propionic acid 3,4-dihydro-2 H -thieno[3,4- b ][1,4]dioxepin-3-ylmethyl ester) (PProDTM-PP), were utilized for the enantioselective detection of chiral 3,4-dihydroxyphenylalanine (DOPA). The enantioselective recognition between chiral PProDTM-PP modified glassy carbon electrodes and chiral DOPA was studied by using different electrochemical technologies. The redox activity and electrochemical stability of chiral PProDTM-PP was good. ( R )-PProDTM-PP and ( S )-PProDTM-PP showed higher peak current responses toward D -DOPA and L -DOPA, respectively. Furthermore, the recognition efficiencies of chiral PProDTM-PP are between 1.48 and 1.89, which is higher than chiral PEDOT-based electrochemical sensors (around 1.10). The chiral PProDTM-PP provides an alternative to chiral recognition.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2019
·Vol. 136
·期 46
·48237
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IF 2.188
Feng Gao,Yifang Mi,Xinlei Wu,Jun Yao,Qi Qi,Zhihai Cao
Stimuli-responsive polymeric nanogels hold great potential in biological applications. In this work, thermoresponsive polymeric nanogels were conveniently prepared through inverse miniemulsion polymerization of two monomers with a good biocompatibility, N -vinylcaprolactam and 2-methoxyethyl acrylate. A macromolecular crosslinker, poly(ethylene glycol) dimethacrylate (PEGDMA), was used to achieve a better thermoresponsiveness, compared with low-molecular-weight crosslinkers. The prepared poly( N -vinylcaprolactam- co -2-methoxyethyl acrylate) (poly(NVCL- co -MEA)) nanogels could be well redispersed in aqueous systems, displaying a reversible thermoresponsive transition behavior. The influences of the synthesis parameters including the emulsifier content, PEGDMA content, and monomer composition on the particle properties of poly(NVCL- co -MEA) nanogels both in inverse emulsions and in aqueous dispersions were systematically investigated. Furthermore, the impacts of the monomer composition and PEGDMA content on the thermoresponsiveness of poly(NVCL- co -MEA) nanogels were also studied. Promisingly, the introduction of MEA monomeric units to the copolymer chains only slightly reduced the thermoresponsiveness of poly(NVCL- co -MEA) nanogels. This feature allows to improve the biocompatibility of polymeric nanogels by using MEA as the comonomer without need to compromise the thermoresponsiveness of nanogels. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 48237.
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JOURNAL OF HAZARDOUS MATERIALS
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2019
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IF 7.65
Jiafei Su,Cuilian Cheng,Yaping Guo,He Xu,Qinfei Ke
Cryptomelane-type octahedral molecular sieve (OMS-2) catalysts are currently attracting tremendous attention due to their low-cost and remarkable thermo-catalytic activity. However, it is still difficult for OMS-2 catalysts to completely degrade formaldehyde at relatively low or even ambient temperature. In this work, OMS-2 catalysts with different ratios of length to diameter were prepared and the OMS-2-s with the minim ratio of length to diameter (1–3) exhibited the best catalytic performance than the other samples. Then, the optimized OMS-2-s nanorods were loaded on the SiO 2 nanofibers via a simultaneous electrospining-spray strategy. The evaluation for the dynamic catalytic activities of the samples showed that, the T 50 (HCHO conversion reached to 50%) for the OMS-2/SiO 2 nanofibrous membranes was decreased by 24 °C than the OMS-2-s nanorods. Furthermore, in the static experiment of HCHO decomposition, the composite membrane could achieve a catalytic efficiency of 52.3% at 25 °C, much higher than that of the OMS-2-s nanorods (45.9%). This work offers a new strategy to improve the catalytic efficiency of OMS-2 by controlling the morphology and loading of OMS-2 nanorods, and also designs a kind of advanced nano OMS-2-based nanofibrous membranes with hierarchical nanostructures for the highly efficient formaldehyde elimination during the practical application.
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PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2019
·
IF 2.298
Lemeng Wang,Xiangfeng Tian,Chi Fang,Hao Huang,Dong Fu,Yuheng Quan
In this work, the surface tensions (γ) of the aqueous blends of 1-dimethylamino-2-propanol (DMA2P) + amino acid ionic liquids (AAILs) were studied using the Wilhelmy plate method at temperatures from 303.2 to 323.2 K and atmospheric pressure. The AAILs include tetramethylammoniumglycinate ([N1111][Gly]), 1-butyl-3-methylimidazolium glycinate ([Bmim][Gly]), and 1-butyl-3-methylimidazolium-l-lysinate ([Bmim][Lys]). The concentrations of DMA2P and AAILs were varied between 0.300 and 0.500 wt % and 0.025 and 0.075 wt %, respectively. A thermodynamic correlation approach with respect to the mass fraction and temperature was employed to correlate the surface tension of DMA2P–AAILs aqueous solutions. The surface entropy (SS) and surface enthalpy (HS) were calculated from the analytical formulation, and their variation with mass fraction and temperature was demonstrated. The effects of the types of AAILs on the surface properties were also analyzed and compared.
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高影响因子
APPLIED SURFACE SCIENCE
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2018
·
IF 4.439
Xudan Li,Hanwei He
Cobalt hydroxide nanosheets/ruthenium oxide (Co(OH) 2 /RuO 2 ) nanocomposite on nickel foam was successfully synthesized via a simple electrodeposition process as an advanced supercapacitor electrode material. The microscopy studies reveal that RuO 2 nanoparticles are loaded uniformly on interconnected Co(OH) 2 nanosheets forming a three-dimensional (3D) network. The performance optimization of composite is come true through adjusting deposition time of RuO 2 nanoparticles. The electrochemical tests indicate that the optimized Co(OH) 2 /RuO 2 nanocomposite displays excellent super-capacitive properties. The specific capacitance is up to 2168 F g −1 as the current density is 1 A g −1 . Compared with the pure Co(OH) 2 and RuO 2 , the capacitance of the Co(OH) 2 /RuO 2 composite increases by 57% and 80%, respectively. The capacitance maintains at 86.0% after 5000 charging and discharging loops at the constant current density of 5 A g −1 , while the pure Co(OH) 2 only maintains 71.7% of the original capacitance after 5000 loops. The asymmetric capacitor assembled using Co(OH) 2 /RuO 2 nanocomposite as positive electrode and activated carbon (AC) as negative electrode exhibits a high energy density of 58.4 W h kg −1 at a power density of 1.2 kW kg −1 . The good pseudocapacitance behavior of the Co(OH) 2 /RuO 2 composite is mainly in virtue of the good synergies between Co(OH) 2 and RuO 2 insuring large surface area, rich electrochemical reactive sites, the short diffusion pathways of ions and good electroconductivity during the charge-discharge process.
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高影响因子
POLYMER DEGRADATION AND STABILITY
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2015
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IF 3.163
Hongli Wu,Binbin Wen,Hua Zhou,Jiadong Zhou,Zuolong Yu,Liyan Cui,Ting Huang,Fei Cao
Polyethylene 2, 5-furandicarboxylate-lactic acid copolyesters (PEFL) were synthesized from bis (hydroxyethyl)-2, 5-furandicarboxylate and oligomer of l -lactic acid, through two-stage condensation . The polyesters were characterized using FTIR, 1 H NMR, GPC , and WXRD. The weight-average molecular weight (M w ) of the polyesters ranged from 68240 to 130433. The glass transition temperature (T g ) of the copolyesters increased gradually with increasing content of 2, 5-furandicarboxylate. In phosphate buffer solution (PBS, pH = 7.4) and in soil, the degradability of the polyesters was evaluated for 55 d. More weight loss was obtained with a higher ratio of lactate polymers in soil than those with a lower ratio in PBS. After 55 d, the weight loss of PEFL20/80 reached 65% and 24% in soil and PBS, respectively. However, the mole fraction of lactyl and furanic units that was calculated by 1 H NMR data did not change. Comparing the scanning electron microscopy images, we found many micro-cracks on the copolyester surfaces. Meanwhile, M w and T g also decreased prominently during degradation.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2013
·
IF 2.004
Qian Zhang,Xiuhong Wang,Xilian Wei,Jie Liu
The detailed micellization behavior of 3-alkyloxy-2-hydroxypropyl trimethylammonium chloride (RnHTACl, n = 12, 14, 16) in aqueous solution was studied by electric conductivity, steady-state fluorescence, and isothermal titration microcalorimetry (ITC) methods. The critical micelle concentration (CMC) and degree of counterion dissociation (α0) were estimated from conductivity curves in the temperature range of 293.15 K to 323.15 K. Then the thermodynamic parameters of micellization (ΔGm0, ΔHm0, and ΔSm0) were calculated by applying a mass-action model equation. On the basis of the ITC results, the CMCs and thermodynamic parameters were also estimated at 293.15 K, which were basically consistent with the results from the conductivity method. According to the Turro–Yekta method, the micelle aggregation number (Nagg) of RnHTACl was determined through static luminescence quenching, and found that the decreased temperature, the elongation of the alkyl chain length or the increased concentration of RnHTACl could lead to an increase of the Nagg.
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高影响因子
Analytical Methods
·
2014
·Vol. 6
·期 6
·1736-1742
·
IF 1.938
Shiquan Xiong,Junjie Cheng,Lulu He,Min Wang,Xin Zhang,Zhengyan Wu
A β-cyclodextrin–graphene (β-CD–G) hybrid composite modified glassy carbon electrode for the first time was used for electrochemically detecting di(2-ethylhexyl)phthalate (DEHP), based on the inclusion of DEHP into β-CD. The electrode was characterized by cyclic voltammetry and electrochemical impedance spectroscopy. At the composites electrode, the impedance value increased linearly with the increasing DEHP concentration in the range of 2 μM to 18 μM, the limit of detection was 0.12 μM (3σ method), with a correlation coefficient of 0.998. The electrode showed good selectivity, reproducibility and stability. Obviously, the collected amounts of DEHP by β-CD–G could be detected through this electrochemical method. Furthermore, this simple and low-cost sensing platform can in principle be extended to the detection of other phthalate esters which can form host–guest complexes with cyclodextrin.
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高影响因子
Journal of Physical Chemistry C
·
2015
·
IF 4.772
Di Bao,Peng Gao,Yanbo Wang,Han Zhou,Yujin Chen,Guorui Chen,Piaoping Yang,Xitian Zhang
In this paper, Cd(OH)2 1D three-side nanobelt architectures have been fabricated through a facile two-phase reaction system. Considering their electropositive character proven by zeta potential measurement, the as-obtained Cd(OH)2 nanomaterials have been applied to capture negatively charged DNA. On the basis of the above results, the Cd(OH)2 nanomaterials have been employed for trapping negatively charged double-stranded DNA molecules (salmon sperm DNA). Assisted by the detailed observation of their DNA interaction results as well as through UV–vis spectroscopy, infrared imaging automatic target recognition (IRATR) and inductive coupled plasma atomic emission spectrometer (ICP-AES) measurements, it has been clearly shown that this 1D nanoarchitecture can effectively trap and release DNA molecules without use of any other organic reagents. In addition, a miniaturized electrochemical DNA-releasing device based on the Cd(OH)2 1D three-side nanobelt architectures has been fabricated. Using this device, it is possible to recycle the Cd(OH)2 nanostructures. In addition, the Cd(OH)2 nanomaterials maintain their nanostructures, and no Cd2+ ions were released in repeated DNA separation and transfer processes, which demonstrate their practicality for DNA trapping.
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高影响因子
International Journal of Greenhouse Gas Control
·
2014
·
IF 3.821
Zhicheng Xu,Shujuan Wang,Guojie Qi,Anastasia A. Trollebø,Hallvard F. Svendsen,Changhe Chen
The carbon dioxide (CO 2 ) solubility in aqueous 2-(diethylamino)-ethanol (DEEA) solutions were measured at (60 and 80 °C), with the DEEA concentrations of 3 M and 4 M and pressure range of (3 to 192 kPa). The absorption heat of CO 2 with (1, 3, and 4 M) aqueous DEEA solutions at different temperatures is also presented in this work. A thermodynamic model based on the electrolyte non-random two-liquid (eNRTL) theory within Aspen Plus ® has been developed to correlate and predict the vapor liquid equilibrium and heat of absorption of CO 2 in aqueous DEEA solutions. Meanwhile, the speciation of the solution at different loadings was also predicted using the developed eNRTL model.
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高影响因子
SPECTROSCOPY LETTERS
·
2015
·
IF 0.852
Bo Zhang,Yanbin Su,Lei Chen,Zhuofu Wu,Fengrong Zhang,Yanwen Su,Gang Zhao,Zhengqiang Li
The characteristic changes in UV-visible and Raman spectra of lithocholic acid on E-2-Butenal for antiglioma are the maximum absorption peak of E-2-Butenal from 302 to 319 nm, the decreases of Raman signal of 1688 cm−1 and 1641 cm−1 in E-2-Butenal by lithocholic acid with the phenomenon of 1688 cm−1 splitting, and the disappearance of the band at 932 cm−1, which clearly displays the change of wagging in methyl. In the presence of mitochondrial protein deriving from glioma, the above mentioned effects of lithocholic acid on E-2-Butenal are more significant by Raman spectra detections. The molecular targets of lithocholic acid on E-2-Butenal are carbonyl group, conjugated double bonds, and methyl, respectively. The study concludes that the interaction between lithocholic acid and E-2-Butenal decreases the carbonyl group bond strength in E-2-Butenal and then changes the structure and function of E-2-Butenal. The internal cause of the interaction between lithocholic acid and E-2-Butenal leading to the change of the carbonyl group bond strength is the electronic delocalization near the carbonyl group bond in E-2-Butenal. Since E-2-Butenal derives from glioma in the process of lipid peroxidation of mitochondria, our investigation significantly contributes to understanding the mechanism of action of lithocholic acid as a potential antiglioma drug.
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高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2015
·
IF 2.037
Fang Zhang,Yaocun Tang,Long Wang,Li Xu,Guoji Liu
The solubility behavior of 2-naphthaldehyde in six pure solvents (methanol, ethanol, isopropanol, n-butyl alcohol, n-heptane, and n-hexane) and binary solvent mixtures of methanol + ethanol with various concentrations were experimentally studied by the equilibrium method at temperatures ranging from (283.15 to 313.15) K and (283.15 to 308.15) K, respectively, under an atmosphere pressure of 0.1 MPa. The solubilities of 2-naphthaldehyde in the pure solvents accord with the following order: ethanol > isopropanol > n-butyl alcohol > methanol > n-heptane > n-hexane. In the mixed solvents, the solubility of 2-naphthaldehyde increases with decreasing mass fraction of methanol. All of the solubility data were correlated with the van’t Hoff equation, the modified Apelblat equation, and the λh equation. The correlation results with the modified Apelblat equation showed better agreement with the experimental values than those with the other two models. Furthermore, the thermodynamic properties of the dissolution process of 2-naphthaldehyde were also calculated and discussed.
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高影响因子
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