IONICS
·
2018
·Vol. 25
·期 1
·25-33
·
IF 2.347
Zhang Kaifang,Mu Shijia,Liu Wei,Zhu Ding,Ding Zhendong,Chen Yungui
Lithium-air/oxygen battery has raised widespread interest due to its extraordinary theoretical energy density (up to 3500 Wh kg −1 ). In this study, a flexible free-standing NASICON (Na-super ionic conductor)-type hybrid solid-state polymer electrolyte (HSPE) based on PVDF-HFP (poly(vinylidene fluoride-hexafluoropropylene)) copolymer and NASICON LATP (Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 ) was prepared and investigated. The HSPE membranes exhibited an ionic conductivity of 1.02 × 10 −4 S cm −1 at room temperature along with a electrochemical window from 2 to 4.5 V. Using the HSPE, a lithium-oxygen/air battery with an inorganic solid-state cathode was fabricated. High initial discharge capacities of 4654 and 5564.3 mAh g −1 were reached under pure O 2 and ambient air, respectively. Compared to conventional porous polypropylene (PP) separator, the HSPE membrane alleviated the corrosion of the lithium anode, thus improving the cyclability of the cells. The results presented in this study suggest the great potential application of NASICON-type HSPE membrane in solid-state rechargeable lithium-air/oxygen batteries.
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高影响因子
CATALYSIS LETTERS
·
2018
·Vol. 148
·期 7
·1827-1833
·
IF 2.911
Xu Weina,Wang Zheyu,Chen Gong,Fu Zhongwang,Jiang Guoqiang,Chen Jian,Wu Jianzhong,Liu Zheng
Abstract We report a facile method for encapsulation of carbonic anhydrase (CA) with magnetic nanogel (MNP-CA nanogel), in which amino and vinyl groups are first grafted onto the surface of magnetic Fe 3 O 4 nanoparticles (MNP) using 3-aminopropyltriethoxysilane (APTES) and N -acryloylsuccinimide (NAS), followed by CA attachment with glutaraldehyde and in situ polymerization with acrylamide. The MNP-CA nanogel shows much improved thermostability at elevated temperatures, e.g. staying unchanged at 60 °C for 80 min, owing to multiple linkage with the hydrophilic polymer network coated at the MNP surface. Addition of the MNP-CA nanogel into a methyldiethanolamine (MDEA) solution at an ultralow mass ratio (1:10 4 ) is able to enhance the CO 2 absorption rate at 60 °C by 1.45 fold. The CA-enhanced mass transport of the absorbate has been demonstrated in a wetted-wall column, in which the MNP-CA nanogel increases the total mass transfer coefficient in the gas phase (K G ) by 4.61 fold compared with that determined in the MDEA solution. The greatly increased absorption performance and much enhanced stability make MNP-CA nanogel appealing for industrial applications. Graphical Abstract
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高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
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2018
·Vol. 34
·期 4
·661-664
·
IF 1.248
Yi Ting,Li Jingwei,Zhang Yibo,Yang Xiangguang
Hollow-ZSM-5 was synthesized by a traditional hydrothermal method without alcohol, and a novel na-no-sized Ce-Cu/hollow ZSM-5 sample was prepared by conventional incipient wetness impreganation. The catalysts were characterized by TEM, SEM, XRD, NMR and N 2 adsorption-desorption. The results indicate that the hollow-ZSM-5 has a good MFI structure with large surface area. The synthesized CeO 2 -CuO/hollow ZSM-5 showed an excellent catalytic activity for NO x conversion(90% NO x conversion were obtained) in the temperature range of 340–550 °C under GHSV=480000 mL·g ‒1 ·h ‒1 due to its appropriate redox ability and acidity.
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高影响因子
Scientific Reports
·
2018
·Vol. 8
·期 1
·1-6
·
IF 4.122
Fu Feiya,Huang Meiqi,Zhang Weilan,Zhao Yang,Liu Xiangdong
A self-healing polybenzoxazine is synthesized solely based on dynamic ester bonds. For this purpose, an anhydride (succinic anhydride) was added into bisphenol F derived benzoxazine monomer before thermocuring. Owing to the transesterification of newly formed ester bonds, the thermoset network behaves as a thermoplastic at 140 °C in the presence of Zn (Ac) 2 , and shows self-healing properties even after multiple damage-healing cycles. Furthermore, kinetics study indicates that the transesterification is a first-order reaction and the activation energy is about 135.4 kJ/mol. This study proposes a facile and economical way to prepare self-healing polybenzoxazine. It has promising applications in coating, adhesive, and other smart materials that rely on structurally dynamic polymers.
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PubMed
高影响因子
AMINO ACIDS
·
2018
·Vol. 50
·期 9
·1269-1278
·
IF 2.906
Wu Pinping,Hu Fan,Wang Ruya,Gao Lingxuan,Huang Tao,Xin Yufu,He Hua
A new colorimetric analysis approach for chiral recognition of d - and l -forms of phenylalanine (phe) was developed based on triangular silver nanoplates (TAg-NPs). The TAg-NPs could be used as chiral colorimetric probes for d - and l -forms of phe. Upon addition of d -phe to TAg-NPs solution, a color change from blue to purple to pink could be observed, while no obvious color change was found on addition of l -phe. l -phe could prevent the TAg-NPs from being etched to small size particles while the protective effect of d -phe was weak. Moreover, the enantiomeric excess of d -phe could be determined using the proposed chiral assay in the percentage of l -phe from 0 to 100% with a correlation coefficient of 0.9855. The phenomenon could be monitored by bare eyes and quantified analysis by UV–Vis spectrophotometry. The developed approach had several advantages, such as simplicity, visualization, short analysis time and low cost. This study presented a fast visualization analysis method of chiral d / l -phenylalanine and may lay the foundation for the development of visualization chiral recognition of other target analytes.
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高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2018
·Vol. 28
·期 6
·2701-2713
·
IF 1.754
Wu Gang,Guo Shuang,Yin Yue,Sun Gang,Zhong Yongjian,You Bo
This paper presented a facile method to prepare the silica/poly (methyl methacrylate) (SiO 2 /PMMA) nanocomposite hollow microspheres (NHSs) which were firstly applied to fabricate the light diffusion films with high transmittance and high haze simultaneously. The SiO 2 /PMMA NHSs were prepared via in situ diffusion of polymeric core into the voids of inorganic shell under strong electrostatic attraction. The hollow morphologies of the microspheres were studied under the help of transmission electron microscope and scanning electronic microscope. The formation process of these NHSs could be elucidated using a mechanism similar to the Kirkendall effect. These NHSs were firstly used to produce light diffusion films by blending with polyacrylate latex. The new kind of light diffusion films with micro-nano structure were built by casting the SiO 2 /PMMA NHSs/polyacrylate coatings on optical-grade PET films. The transmittance and haze value of the light diffusion films were tested by a haze meter and application on a LED lamp. As a result, the coating films with NHSs had the best light diffusion properties compared to those films with no spheres or nanocomposite solid microspheres, which indicated that the light diffusion films with NHSs were promisingly applied in LED illumination, photoelectric devices and large area LCD.
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高影响因子
IONICS
·
2018
·Vol. 25
·期 2
·727-735
·
IF 2.347
Feng Aihu,Yu Yang,Mi Le,Yu Yun,Song Lixin
In this work, the MXene Ti 3 C 2 with excellent electrical conductivity is obtained by etching Ti 3 AlC 2 with NH 4 HF 2 solution. The electrosorption performance, the electrochemical and physicochemical properties of as-prepared Ti 3 C 2 are characterized. The results demonstrate that NH 4 HF 2 -etched Ti 3 C 2 possesses the better intercalation pseudo-capacity and the specific capacitance is up to 78 F∙g −1 , which is an increase of 34% than HF-etched Ti 3 C 2 . In addition, the desalination capacity of NH 4 HF 2 -etched Ti 3 C 2 enhances 35.5% than that of HF-etched Ti 3 C 2 . When the initial conductivity of NaCl is ~ 1000 μS/cm, the desalination capacity of NH 4 HF 2 -etched Ti 2 C 3 electrode is 12.1 mg∙g −1 , and the pseudo-first-order model can well describe the electrosorption kinetics of NH 4 HF 2 -etched Ti 3 C 2 electrode. Furthermore, the regeneration performance of the NH 4 HF 2 -etched Ti 3 C 2 electrode is excellent. This study indicates a new kind of effective electrode material to improve the desalination performance of capacitive deionization (CDI) technology.
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高影响因子
FIBERS AND POLYMERS
·
2018
·Vol. 19
·期 10
·2134-2138
·
IF 1.353
Wang Zongqian,Li Changlong,Zhang Hulin,Liu Zhi
Chromophore incorporated into the protein chains through residue modification on silk fibroin will be an important way to get new dyeing technology with improved color fastness. Herein, 1-aminoanthraquinone diazonium salt was prepared and used for the modified dyeing on tyrosine of silk fibroin. The silk after modified dyeing was measured by UV-Vis, FTIR, MS, 1 H-NMR, Data color, and other testing techniques. Interestingly, the resulting silk showed excellent rub and wash fastness. The enhanced color fastness is contributed by an electrophilic substitution reaction between 1- aminoanthraquinone diazonium salt and the ortho position of phenolic hydroxyl in tyrosine molecular. Moreover, the mechanical property of silk was protected effectively by the mild coupling modified dyeing, better than the traditional acid dyeing under high temperature for a long time. This facile strategy provides an alternative approach to silk dyeing and benefits the silk applications.
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高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2018
·Vol. 411
·期 1
·139-146
·
IF 3.307
Zhang Meng,Zhou Fenyue,Zhou Deqi,Chen Dongli,Hai Hong,Li Jianping
A novel electrochemical luminescence (ECL) aptamer biosensor via polymerase amplification is constructed for label-free detection of leukemia marker mRNA (miR-16). In order to achieve the ultrasensitive detection of the target mRNA, the cyclic target chain displacement polymerization of leukemia marker mRNA assisted with Klenow fragment of DNA polymerase is employed. The determination is carried out by recording the ECL emission of pyridine ruthenium (Ru(bpy) 3 2+ ) complexes embedded into the assistance DNA (ADNA) loaded on the nanogold surface, after the hybridization reaction between the probe DNA (PDNA) and the remaining sequence of the CP’s stem part, and the formation of a core-shell sun-like structure. The mercapto-modified capture DNA (CP) is immobilized on the surface of a magneto-controlled glassy carbon electrode by Au-S bond. The CP is opened and hybridized with the target mRNA to form double-stranded DNA. In the presence of polymerase, primer DNA, and bases (dNTPs), the primer chain gets access to its complementary sequence of the stem part and then triggers a polymerization of the DNA strand, leading to the release of mRNA and starting the next polymerization cycle. Finally, the composite of PDNA-covered and ADNA-covered (embedded with Ru(bpy) 3 2+ ) gold nanoparticles (hereafter called AuNPs@(PDNA+ADNA-Ru(bpy) 3 2+ ) is added, and the ECL intensity is recorded. Because of the polymerization cycle and the aggregation of the illuminator of Ru(bpy) 3 2+ , the detected signal is amplified significantly. The results showed that the corresponding ECL signal has a good linear relationship with a logarithm of target mRNA concentration in the range of 1 × 10 −16 to 1 × 10 −7 mol/L, with a detection limit of 4.3 × 10 −17 mol/L. The mRNA spiked in the human serum sample is determined, and the recoveries are from 97.2 to 102.0%. This sensor demonstrates good selectivity, stability, and reproducibility.
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高影响因子
MACROMOLECULAR RESEARCH
·
2018
·Vol. 26
·期 13
·1241-1250
·
IF 1.767
Shen Xiang,Liu Peng,Xu Jiao,Liu Teng,Liu Jianjun,Shen Xianfu,Xia Shubiao,Wang Fan
Membrane technology has been accepted as a very effective approach to purify oily wastewater. However, the serious membrane fouling induced by the adsorption of oily foulants significantly hinders the development of membrane technology in treating oily wastewater. To improve the anti-fouling property and oil/water separation efficiency of membrane, this work reports on the covalent immobilization of short-chain arginine (Arg) molecules onto polyacrylonitrile/polyacrylonitrile- co -poly(glycidyl methacrylate) (PAN/PAN- co -PGMA) blend membrane surface via a ring-opening reaction between epoxy groups and amine groups. It was found that the covalent immobilization of Arg molecules effectively increased the surface hydrophilicity of the membrane, resulting in a significant decrease of the interaction force between the foulants and the membrane surface. This typical characteristic was revealed by the pure water contact angle and the force-extension curve measurements. The Arg-immobilized membranes exhibited much higher separation efficiency against oil/water emulsions than the pristine PAN and PAN/PAN- co -PGMA membranes. Especially when the grafting amount of Arg was 157.3 μg/cm 2 , the oil rejection ratio of an Arg-immobilized membrane was as high as 99.2%. In addition, the flux recovery ratio of the membrane still reached 88.8%, even after two cycle filtrations of pure water and oil/water emulsion. These results indicated that the Arg-immobilized membrane may have practical applications for oil/water emulsion separation.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 54
·期 2
·1539-1548
·
IF 2.993
Wang Chao,Ping Hang
Biomineralization-associated proteins are responsible for the structure-forming process of biominerals. Aiming to regulate the synthesis of nanostructured TiO 2 anatase, an artificial protein 5R5 derived from silaffins was displayed on Escherichia coli surface through genetic manipulation. The genetically modified bacterial cells serve as the framework for the formation of rod-shaped TiO 2 , assembled by nanoparticles, as well as provide a carbon source in situ during the carbonization process. The particle size and carbon content were controllable by changing the heating temperature and time. The electrode annealed at 800 °C for 1 h shows the highest reversible capacity of 160.2 mA h g −1 after 200 cycles at a current rate of 1C. This unique nanostructured anatase not only shortens the diffusion pathway of lithium ions and electrons, but also improves the electric conductivity and tolerates the volume change during charging/discharging owing to carbon coating. However, the larger particle size and high carbon content were not advantageous to improve lithium storage performance.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 29
·29335-29344
·
IF 2.8
Zhao Shuyan,Yang Qiao,Wang Bohui,Peng Yihong,Zhan Jingjing,Liu Lifen
The effects of combined exposure to perfluoroalkyl acids (PFAAs) and heavy metals (HMs) including cadmium (Cd), copper (Cu), zinc (Zn), nickel (Ni), and lead (Pb) on earthworms ( Eisenia fetida ) were investigated. The results have demonstrated that the concentrations of labile acid exchangeable Cd, Zn, Ni, Pb, and Cu in soil were enhanced in addition of PFAAs. With PFAAs, the uptake of Cd, Zn, Ni, Pb, and Cu in earthworms was increased compared to those without PFAAs with the order of Cd > Zn > Pb > Ni > Cu. In the presence of HMs, the average biota-to-soil accumulation factors (BSAFs) of PFAAs in earthworms were decreased by 0.498–0.729 times for perfluorooctane sulfonate (PFOS) and 0.606–0.978 times for perfluorooctanoic acid (PFOA), indicating decrease rates of PFOS were higher than those of PFOA. And different levels of HMs led to insignificant different responses on the inhibiting effects of PFAAs uptake in earthworms. The increase of Cd in fraction C (associated with cytosol) and decrease of PFAAs in fraction C and fraction P (associated with tissue fragments, cell membranes, and intact cells) especially for fraction C were revealed when they were combined, suggesting cytosolic PFAAs and Cd were susceptibly mutual effected. This study indicated that PFAAs and metals mutually affected their bioaccumulation and subcellular distribution in earthworms, which will help to understand the fate and risks of PFAAs and metals in co-contaminated soil.
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高影响因子
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