JOURNAL OF POWER SOURCES
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2018
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IF 6.945
Yuanfang Hu,Bingxi Wang,Xiao Li,Dongyang Chen,Weiying Zhang
To develop high performance anion exchange membranes (AEMs), a novel bisphenol monomer bearing eight benzylmethyl groups at the outer edge of the molecule was synthesized, which after condensation polymerization with various amounts of 4,4′-dihydroxydiphenylsulfone and 4,4′-difluorobenzophenone yielded novel poly(arylene ether)s with densely located benzylmethyl groups. These benzylmethyl groups were then converted to quaternary ammonium groups by radical-initiated bromination and quaternization in tandem, leading to the emergence of densely quaternized poly(arylene ether sulfone)s (QA-PAEs) with controlled ion exchange capacities (IECs) ranging from 1.61 to 2.32 mmol g −1 . Both small-angle X-ray scattering (SAXS) and transmission electron microscopy (TEM) studies revealed distinct phase separation in the QA-PAEs. The QA-PAE-40 with an IEC of 2.32 mmol g −1 exhibited a Br − conductivity of 9.2 mS cm −1 and a SO 4 2− conductivity of 14.0 mS cm −1 at room temperature , much higher than those of a control membrane with a similar IEC but without obvious phase separation. Therefore, phase separation of AEMs was validated to be advantageous for the efficient conducting of anions. The experimental results also showed that the QA-PAEs were promising AEM materials, especially for non-alkaline applications.
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高影响因子
ELECTROCHIMICA ACTA
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2014
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IF 4.086
Shan Liu,Maochao Wei,Xiangli Zheng,Shuai Xu,Fangquan Xia,Changli Zhou
In the paper, a novel and sensitive electrochemical sensor based on modification of electroactive alizarin red S functionalized mesoporous silica material SBA15 onto glassy carbon electrode (ARS-SBA15/GCE) was developed. Alizarin red S , called electrochemical probe that can selectively recognize polycyclic aromatic hydrocarbons (PAHs), as tools for the detection of tricyclic aromatic hydrocarbon anthracene. The morphology and interface property of ARS modified SBA15 (ARS-SBA15) were examined by transmission electron microscopy (TEM) and fourier transform infrared spectroscopy (FTIR). Taking advantage of the π-π stacking force between alizarin red S and anthracene, the ARS-SBA15/GCE sensor could detect anthracene quantitatively in a wide range of 1.0 pM–10.0 nM and a low detection limit of 0.5 pM (S/N = 3). Other PAHs, such as naphthalene, phenanthrene, pyrene, and benzo[a]pyrene show little interference on the detection. Consequently, a simple and sensitive electrochemical method was proposed for the determination of anthracene, which can be used to determine anthracene in waste water samples. The electrochemical method provides a general tool that complements the commonly used spectroscopic methods and immune method for the detection of PAHs.
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JOURNAL OF MEMBRANE SCIENCE
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2014
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IF 4.908
Pei Yu Xu,Ke Zhou,Guang Lu Han,Qiu Gen Zhang,Ai Mei Zhu,Qing Lin Liu
A series of novel quaternized fluorene-containing poly(arylene ether sulfone)s (APESs) were synthesized. Bromination rather than chloromethylation was used for the conversion of –CH 3 to reactive –CH 2 Br. N,N,N׳,N׳-tetramethyl-1,6-diaminohexane (TMHDA) dissolved in isopropanol (IPA) was used as a quaternization reagent for the preparation of target anion exchange membranes (AEMs). Fourier transform infrared spectroscopy (FT-IR), 1 H NMR spectroscopy and gel permeation chromatography (GPC) were used to characterize the as-synthesized copolymers . The ratio of hydrophilic to hydrophobic monomers was varied to study the structure property of the AEMs. The obtained AEMs were characterized by scanning electron microscopy (SEM) and thermogravimetric analysis (TGA). Water uptake (WU), swelling ratio, ionic exchange capacity (IEC), ionic conductivity , methanol permeability and alkaline stability were also studied. These AEMs have good properties as polymer electrolyte materials with high ionic conductivity (under hydrated conditions) in the range 2.89–8.85×10 −2 S cm −1 and 5.60–15.64×10 −2 S cm −1 at 30 and 80 °C, respectively. The methanol permeability of the AEMs in the range 5.99–14.51×10 −8 cm s −1 is lower than that of Nafion ® 117 (1.82×10 −6 cm s −1 ). The AEMs show excellent alkaline stability in 1 M KOH solution at 60 °C for a long time. Single cell testing using APES-0.8 showed an open circuit voltage of 0.89 V. A maximum power density of 146 mW cm −2 at a current density of 423 mA cm −2 can be achieved at 60 °C. In summary the AEMs are good candidates for evaluation in fuel cell applications .
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高影响因子
RSC Advances
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2015
·Vol. 5
·期 21
·16368-16375
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IF 3.84
Yupeng Sun,Chen Shen,Jing Wang,Yun Lu
A facile, simple, effective and green method has been developed to synthesize nitrogen and sulfur co-doped carbon dots (N, S-CDs) from heparin sodium. The as-prepared N, S-CDs possess naked-eye observable blue-green luminescence, good biocompatibility, low toxicity and strong fluorescence in live cell imaging, indicating their great potential to serve as high quality optical imaging probes. Besides, the N, S-CDs can also be used as a competitive fluorescent sensing platform for the detection of Fe3+.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2015
·Vol. 26
·期 9
·6563-6571
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IF 1.569
Lu Tianxing,You Jing,Zhao Dan,Wang Hua,Miao Yanqin,Liu Xicheng,Xiao Yin,Li Xianggao,Wang Shirong
Three s -triazine/carbazole based bipolar molecules: 9,9′,9″-(1,3,5-triazine-2,4,6-triyl)tris(3,6-di- tert -butyl-carbazole) (TazTCz), 9,9′-(6-phenyl-1,3,5-triazine-2,4-diyl)bis(3,6-di- tert -butyl-carbazole) (PhTazDCz) and 9-(4,6-diphenyl-1,3,5-triazine-2-yl)-3,6-di- tert -butyl-carbazole (DPhTazCz) were synthesized and applied as host materials for blue phosphorescent organic light-emitting diodes (PHOLEDs). The triplet state energy levels are ~2.86 eV for these compounds, ensured their application in blue PHOLEDs. X-ray single crystal structural analysis revealed a non-planar structure of TazTCz, which prevented the intermolecular close-packing in the solid state. X-ray diffraction spectra also confirmed that TazTCz and PhTazDCz could form amorphous films with spin-coating method. The bipolar characteristics of as-synthesized compounds were confirmed by carrier mobility measurement. The device parameters of blue PHOLEDs based on these compounds as host materials exhibit that the balance of electron and hole mobilities is benefit for reducing turn-on voltage and efficiency roll-off at high current density.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2014
·Vol. 131
·期 18
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IF 1.64
Qiheng Tang,Yun Song,Jiyu He,Rongjie Yang
A series of thermoplastic poly(imide-urethane)s (TPIUs), based on 4,4′-diphenylmethane diisocyanate (MDI) and pyromellitic anhydride (PMDA) as hard segments and poly(tetrahydrofuran) (PTMG) as soft segments, has been prepared by a two-step polymerization process. The objective of this study is to prepare a type of intrinsically flame-retardant polyurethane by incorporating PMDA as a flame retardant in the main chains. The thermal behavior and flame retardancies of the TPIUs have been characterized by thermal gravimetric (TG) analysis and limiting oxygen index (LOI), UL-94 vertical burning, cone calorimeter tests. The results indicate that the TPIUs display outstanding performance. The temperature at 5% mass loss ( T 5% ) and LOI value increase with the hard-segment contents, while the total heat released (THR) and peak heat release rate (p-HRR) show the opposite trend. Furthermore, the T 5% of TPIU211 (molar ratio: MDI : PTMG : PMDA = 2 : 1 : 1) is 33.2°C higher than that of the conventional thermoplastic polyurethane TPU211 (molar ratio: MDI : PTMG : 1,4-butanediol = 2 : 1 : 1), and the THR and p-HRR of TPIU211 are 14.62% and 64.02% lower than the respective parameters of TPU211. In addition, UL-94 vertical burning tests show that the TPIUs exhibit excellent antidripping effects. The ultimate tensile strengths of the TPIUs reached 23.1−37.6 MPa with increasing hard segment contents, which meets the requirement of mechanical properties with regard to practical use. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 40801.
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JOURNAL OF ELECTRONIC MATERIALS
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2014
·Vol. 43
·期 6
·2435-2439
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IF 1.675
Tan Qing,Li Jing-Feng
To study the possibility of SnS as an earth-abundant and environmentally friendly thermoelectric material, the electrical and thermal transport properties of bulk materials prepared by combining mechanical alloying and spark plasma sintering were investigated. It was revealed that SnS has potential as a good thermoelectric material, benefiting from its intrinsically low thermal conductivity below 1.0 W/m/K above 400 K and its high Seebeck coefficient over 500 μ V/K. Although the highest ZT value was 0.16 at 823 K in the pristine sample, further enhancement can be expected through chemical doping to increase the electrical conductivity. It was also revealed that changing the stoichiometric ratio and sintering temperature had less apparent influence on the microstructure and thermoelectric properties of SnS because redundant S in the powders decomposed during the sintering process.
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Polymer Chemistry
·
2013
·Vol. 5
·期 3
·882-891
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IF 5.231
Ping Wang,Yin-Ning Zhou,Jiang-Shui Luo,Zheng-Hong Luo
In this study, a novel kind of organic–inorganic core–shell SiO2-poly(p-vinylbenzyl) trimethylammonium tetrafluoroborate (SiO2–P[VBTMA][BF4]) nanoparticle was well designed and successfully synthesized via surface-initiated atom transfer radical polymerization (SI-ATRP). Fourier transform infrared spectroscopy (FT-IR), 1H nuclear magnetic resonance (1H NMR), X-ray photoelectron spectroscopy (XPS), dynamic light scattering (DLS) and scanning electron microscopy (SEM) were used to confirm the formation of the core–shell nanoparticles and the surface modification. In order to overcome the challenge of the characterization of the number average molecular weight of poly(ionic liquid)s, “sacrificial initiator” method was used here employing a trimethylsilyl (TMS)-labeled initiator as the NMR marker for integration. In addition, good thermal stability of the new hybrid polyelectrolyte was proved by thermogravimetric analysis. The electrochemical impedance measurements revealed that the room temperature conductivity reached 10−4 S cm−1, which is much higher than that of the pure poly(ionic liquid)s and varies with the amount of the grafted polymer and the test temperature. The X-ray diffraction (XRD) tests further investigated the crystal structure of the nanocomposite and pure P[VBTMA][BF4]. The temperature dependence of ionic conductivity conforms to Arrhenius behavior for both of the nanocomposites and the pure polymer. The results indicated that the SI-ATRP approach provided a simple and versatile route to tune the ionic conductivity of the hybrid nanoparticles by changing the chain length of the grafted polymer, which can be potentially used in a variety of electrochemical devices.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2014
·Vol. 131
·期 21
·
IF 1.64
Yan Wu,Yong Deng,Qiulin Yuan,Ying Ling,Haoyu Tang
A series of thermoresponsive poly(γ-propyl- L -glutamate)-graft-(oligo ethylene glycol)s (PPLG-g-OEGs) with different main-chain and side-chain lengths have been synthesized via copper-mediated alkyne-azide 1,3-dipolar cycloaddition between poly(γ-azidopropyl- L -glutamate)s (PAPLG) and propargyl terminated oligo ethylene glycols (Pr-OEGs). Fourier transform infrared spectrometer analysis revealed that PAPLG 10 adopted 39.4% β-sheet, 47.4% α-helix, and 13.2% random coil while PAPLG with longer main-chain length (DP = 37 and 88) and PPLG-g-OEGs adopted exclusive α-helix in the solid state. Circular dichroism analysis revealed that PPLG-g-OEGs adopted α-helical conformations with helicities in the range of 50∼100%. The thermoresponsive behaviors of PPLG-g-OEGs in water have been studied by dynamic light scattering. The polymer concentration, main-/side-chain length, and helicity collectively affected their cloud point temperatures. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 41022.
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APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Junxia Guo,Qijian Niu,Yichun Yuan,Inamullh Maitlo,Jun Nie,Guiping Ma
One-dimensional (1D) nanomaterials have gained attention in energy conversion, storage, and catalyst due to the unique physical and chemical properties. Electrospinning is a kind of simple, versatile, and cost-effective technology to fabricate 1D functional nanofibers. Herein, electrospun polyacrylonitrile (PAN), melamine, and ferric chloride hexahydrate (FeCl 3 ·6H 2 O) composite nanofibers are used as template, and polythiophene (PT) are prepared by photopolymerization technology on the surface of electrospun nanofibers as shell part of fibers. Then, the core–shell nanofibers are pyrolyzed and converted into Fe–S/N–C nanofibers, which can be used as catalysts for ORR due to the metal and S-/N-codoped structure and unique 1D structure which provided facile pathways for efficient mass transport and charge transfer. The ORR electrocatalytic ability of Fe–S/N–C nanofibers is tested and present excellent property, especially in stability and methanol crossover. The electrocatalytic ability of sample is comparable to that of 20 wt% Pt/C benchmarks. These results offer an easy pathway for exploring metal-heteroatom-codoped carbon nanofibers applicable for ORR catalyst.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2016
·
IF 2.857
Rui Zhang,Rutao Liu,Wansong Zong
Bisphenol S (BPS) is present in multitudinous consumer products and detected in both food and water. It also has been a main substitute for bisphenol A (BPA) in the food-packaging industry. Yet, the toxicity of BPS is not fully understood. The present study of the toxicity of BPS was divided into two parts. First, oxidative stress, cell viability, apoptosis level, and catalase (CAT) activity in mouse hepatocytes and renal cells were investigated after BPS exposure. After 12 h of incubation with BPS, all of these parameters of hepatocytes and renal cells changed by >15% as the concentration of BPS ranged from 0.1 to 1 mM. Second, the direct interaction between BPS and CAT on the molecule level was investigated by multiple spectral methods and molecular docking investigations. BPS changed the structure and the activity of CAT through binding to the Gly 117 residue on the substrate channel of the enzyme. The main binding forces were hydrogen bond and hydrophobic force.
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PubMed
高影响因子
POLYMER
·
2017
·
IF 3.684
Zhongying Wu,Yiyao Tang,Dewen Sun,Shujiang Zhang,Yixuan Xu,Hua Wei,Chenliang Gong
Organic-inorganic hybrid polymers based on poly(arylene ether sulfone) (PAES) containing multi-sulfonated polyhedral oligosilsesquioxane (POSS) pendants (PAES-sPOSS-x) were synthesized to improve the inorganic fillers' distribution in polymer matrix and to enhance the ion conductivity and swelling resistance of aromatic polymer electrolyte membrane. The synthesis of the graft hybrid polymers in this study involves the grafting of mono-functional 3-Iodopropylheptaphenyl POSS with an -OH functionalized polymer main-chain and postsulfonation of the POSS grafted PAES. Notably, nearly all of the benzene rings on the POSS side chains were sulfonated successfully without any sulfonation of main chains. The structure with hydrophobic aromatic backbone and hydrophilic hybrid side chains made an improvement of the nano-phase hydrophilic/hydrophobic separation, thereby facilitating the formation of continuous proton exchange channels. The transmission electron microscopy (TEM) images of the comb-shaped polymer membranes showed homogeneous sulfonated POSS (sPOSS) dispersion, significant phase separation and well-defined interconnected hydrophilic networks. This morphological structure leaded to dramatically enhanced comprehensive properties as proton conductive membranes.
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