ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2019
·Vol. 411
·期 19
·4929-4935
·
IF 3.286
Cheng Kai,Wu Qiong,Jiang Ling,Liu Maili,Li Conggang
Ionic liquids have been extensively used as environmentally friendly solvents for enzymatic reactions and other biological systems. Understanding the mechanism of how ionic liquids affect protein stability is crucial for the biological reaction processes and protein storage using ionic liquids as solvents. Although effects of ionic liquids on protein stability have been studied, equilibrium thermodynamics of protein stability in ionic liquids has not been quantitatively measured. Herein, we utilized 19 F NMR to measure the equilibrium thermodynamics of protein stability in ionic liquid [C 4 -mim]Br. Our results show that proteins are significantly destabilized in [C 4 -mim]Br ionic liquids. Our results suggest that 19 F NMR provides a simple and effective way to study the thermodynamics of protein stability in ionic liquids. 19 F NMR will be applicable to facilitate the protein–protein interaction study in ionic liquids.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2019
·Vol. 30
·期 8
·7725-7732
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IF 2.195
Ullah S.,Han Z.,Zheng Guangping
The nanocomposites consisting of graphene oxide (GO) and ferroelectric copolymer poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)] have been successfully synthesized by a co-evaporation method. The structural, dielectric and ferroelectric properties of the composite papers are investigated. The Raman spectroscopy analyses on the nanocomposites GO/P(VDF-TrFE) reveal that the defects in GOs are reduced significantly by the loading of ferroelectric P(VDF-TrFE). The I G /I D ratio increases from 1.02 (for pure GO) to 1.17 [for GO/P(VDF-TrFE)-10%], revealing that the defects are reduced by the introduction of the nano-fillers due to a strong interaction between GO and P(VDF-TrFE) in the nanocomposites. The permittivity of the nanocomposites is enhanced by almost 3-times as compared to that of the pristine GOs. The nanocomposites show a notably raised polarization with high applied electric field. Furthermore, due to the high dielectric constants, the electrical energy storage density of the nanocomposites is as high as ~ 39.89 J cm −3 at 2.8 MV cm −1 . The large energy density and high dielectric break down strength suggest that GO/P(VDF-TrFE) could be the promising novel materials for electrical energy storage.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2019
·Vol. 411
·期 12
·2521-2530
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IF 3.286
Su Ruifang,Zheng Hongru,Dong Shuyue,Sun Rui,Qiao Shangna,Sun Hongjing,Ma Xinyue,Zhang Tiehua,Sun Chunyan
The development of a novel method for melamine detection that uses a FAM–aptamer–G-quadruplex construct due to the efficient quenching ability of an aptamer-linked G-quadruplex is reported herein. The construct, which is labeled with the fluorescent dye 6-carboxyfluorescein (FAM), consists of two parts: a melamine-binding aptamer and a G-rich sequence that can form a G-quadruplex structure. Because of the specific recognition of melamine by the T-rich aptamer, this aptamer folds into a hairpin structure in the presence of melamine, which draws the G-quadruplex closer to the FAM fluorophore, leading to the quenching of the fluorescence of FAM. Thus, a highly sensitive and selective fluorescence strategy for assaying melamine was established. Under optimal conditions, the fluorescence quenching is proportional to the concentration of melamine within the range 10–90 nM, and the method has a detection limit of 6.32 nM. Further application of the method to plastic cup samples suggested that it permitted recoveries of between 97.15% ± 1.02 and 101.92% ± 2.07. The detected amounts of melamine spiked into the plastic cup samples and the corresponding amounts measured by HPLC were in good accordance, indicating that this fluorescent method is reliable and practical. Owing to its high sensitivity, excellent selectivity, and convenient procedure, this strategy represents a promising alternative method of melamine screening.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
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2019
·Vol. 35
·期 2
·319-324
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IF 1.071
Wang Junlin,Yi Yongjie,Li Mengjia,Chang Yue,Zha Fei
Graphitic carbon nitride(g-C 3 N 4 ) microspheres supported α-FeO(OH) hybrids[α-FeO(OH)/g-C 3 N 4 ] were prepared by means of a self-assembly method in deionized water. By UV-visible diffuse reflectance spectroscopy, it has been confirmed that α-FeO(OH)/g-C 3 N 4 has a wider absorption range than g-C 3 N 4 . The feature of α-FeO(OH)/g-C 3 N 4 can be attributed to the efficient separation of the electron-hole pairs with photoluminescence spectra. The degradation rate of methyl orange(MO) is up to 99% under the optimal conditions of 110 min, initial concentration of 30 mg/L, an α-FeO(OH)/g-C 3 N 4 dosage of 15 mg as well as visible light. The mechanism for this photocatalytic reaction was proposed, with hydroxyl radicals being a major active catalytic species.
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JOURNAL OF POROUS MATERIALS
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2018
·Vol. 26
·期 3
·819-828
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IF 1.858
Tao Jianli,Liu Lujuan,Zhu Peihong,Zhai Kang,Ma Qian,Zhang Danning,Ma Jie,Zhai Yunpu,Liu Yonggang,Zhang Ruiqin
A Ni-based cage-like C–SiO 2 –Al 2 O 3 (Ni/CL-CSA) catalyst was synthesized successfully via a facile dual-templating method and used for the hydrotreatment of phenol. The catalyst was characterized by SEM, TEM, XRD, TG and N 2 adsorption techniques. Results show that Ni/CL-CSA has three-dimensional connected macroporous structure with pore size of about 100 nm and ordered mesoporous windows with average pore size of approximately 3.8 nm. Size of nickel particle is 6.1 nm. BET surface area of the catalyst is 212 m 2 /g and pore volume is 0.24 cm 3 /g. Hydrogenation and the stability performance of the catalyst was studied for bio-oil model compound phenol. Results reveal that adding macropores into Ni-based mesoporous C–SiO 2 –Al 2 O 3 (Ni/MP-CSA) can improve the mass transfer rate and reduce the particles growth, thus improve the catalytic activities in the hydrotreatment of phenol, reducing catalyst sintering at high temperature and improving the stability of the catalyst.
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Nano Research
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2018
·Vol. 11
·期 12
·6244-6251
·
IF 7.994
Zhang Xuejing,Wang Xingchao,Liu Shuang,Tao Zhanliang,Chen Jun
In recent years, development of all-solid-state batteries has become a promising approach to improve the safety of batteries. Herein, we report the preparation of a new composite polymer electrolyte (CPE) for use in all-solid-state sodium ion batteries. The CPE comprising of poly(methacrylate) (PMA), poly(ethylene glycol) (PEG), α -Al 2 O 3 with acidic surface sites, and NaClO 4 exhibited high ionic conductivity (1.46 × 10 -4 S·cm -1 at 70 °C), wide electrochemical stability window (4.5 V vs. Na + /Na), and good mechanical strength. With the introduction of the prepared CPE and Na 3 V 2 (PO 4 ) 3 , the final all-solid-state sodium ion batteries showed good rate and cycle performance, with a high reversible capacity of 85 mAh·g -1 when operated at 0.5 C (1 C = 118 mA·g –1 ) and 94.1% capacity retention rate after 350 cycles at 70 °C. Our work provides a novel solid electrolyte for the development of all-solid-state sodium ion batteries.
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JOURNAL OF MATERIALS SCIENCE
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2019
·Vol. 54
·期 20
·13118-13134
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IF 3.442
Zhang Xiaorong,Shakeel Muhammad,Li Baoshan,Zhang Jinxi,Wang Lei
Proficient visible light-driven photocatalyst for waste water remediation has gained immense attention in decades. Herein, novel foamed zinc oxide–silica spheres and carbon nitride nanocomposite (FZSS@CN) were fabricated by hydrothermal and calcination treatments. The resulting nanocomposite was passed through complete characterization profiling for structural, optical and kinetics properties. The photocatalytic performance was investigated by the degradation of textile dyes such as methylene blue (MB) and Rhodamine B (RhB) under visible light. The optimized nanocomposite (FZSS@CN-10) exhibited the superior photocatalytic degradation performance up to 95% for MB and 90% for RhB with rate constant ( k ) = 0.0516 min −1 and 0.0464 min −1 , respectively. This excellent performance was attributed to the hierarchical morphology, high surface area and mesoporous channels with open cavities. This uniqueness is responsible to enhance the optical and kinetic capabilities of the material for effective photocatalysis. More interestingly, the crystalline structure of the recycled sample has more sharp peaks than fresh sample. This phenomenal behavior leads to a new method for the fabrication of effective materials in this field.
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CHINESE JOURNAL OF POLYMER SCIENCE
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2019
·Vol. 38
·期 1
·9-16
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IF 2.804
Man Shou-Kuo,Wang Xiao,Zheng Jin-Wen,An Ze-Sheng
Polymerization-induced self-assembly (PISA) is an efficient and versatile method to afford polymeric nano-objects with polymorphic morphologies. Compared to dispersion PISA syntheses based on soluble monomers, the vast majority of emulsion PISA formulations using insoluble monomers leads to kinetically-trapped spheres. Herein, we present aqueous emulsion PISA formulations generating worms and vesicles besides spheres. Two monomers with different butyl groups, n -butyl ( n BHMA) and tert -butyl ( t BHMA) α -hydroxymethyl acrylate, and thus possessing different water solubilities were synthesized via Baylis-Hillman reaction. Photoinitiated aqueous emulsion polymerizations of n BHMA and t BHMA employing poly(ethylene glycol) macromolecular chain transfer agents (macro-CTAs, PEG 45 -CTA, and PEG 113 -CTA) at 40 °C were systematically investigated to evaluate the effect of monomer structure and solubility on the morphology of the generated block copolymer nano-objects. Higher order morphologies including worms and vesicles were readily accessed for t BHMA, which has a higher water solubility than that of n BHMA. This study proves that plasticization of the core-forming block by water plays a key role in enhancing chain mobility required for morphological transition in emulsion PISA.
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IONICS
·
2019
·Vol. 26
·期 2
·777-787
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IF 2.289
Jing Pengcheng,Lu Huimin,Yang Wenwen,Cao Yuan,Xu Binbin,Cai Wei,Deng Yan
Magnesium batteries based on Mg 2+ /Li + dual ion electrolytes (MLIBs) have attracted increasing attention due to fast Li + or Mg 2+ /Li + insertion kinetics, abundant Mg resources, and high volumetric capacity of dendrite-free Mg anodes. Herein, we report polyaniline (PANI)–coated VS 4 @reduced graphene oxide (rGO) with nanostructures synthesized via hydrothermal synthesis and subsequent PANI polymerization as the cathode material for MLIBs. The PANI layer serves as a conductive medium to enhance electron transfer and Mg 2+ /Li + transportation as well as to mitigate the structure changes of VS 4 during the cycling process. Indeed, this material demonstrates enhanced electrochemical performance with a high discharge capacity of 200.7 mAh g −1 after 20 cycles and 91.2% retention after 50 cycles. Mechanism analysis reveals that Li + insertion into VS 4 produced an amorphous VS 4 host in the first discharge, which inclined to store Mg 2+ rather than Li + in the subsequent cycles. Our study provides new insights into the development of amorphous electrode materials for magnesium batteries.
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CHINESE JOURNAL OF POLYMER SCIENCE
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2019
·Vol. 38
·期 1
·72-83
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IF 2.804
Han Yue,Tang Dong-Hao,Wang Guang-Xing,Sun Ya-Nan,Guo Ying,Zhou Heng,Qiu Wen-Feng,Zhao Tong
Vanillin was used as sustainable source for phthalonitrile monomer synthesis, and allyl/propargyl ether moieties were introduced to improve the processability at the minimal cost of thermal properties. The synthesis route was optimized to minimize side-reactions and simplify post-processing, and the monomers were obtained in high purity and good yields. The curing behavior, mechanism, and processability of the monomers were studied, and the thermal properties of cured polymers were evaluated. Of the two monomers, the allyl ether-containing one exhibited a wide processing window of 185 °C, and was mainly cured into phthalocyanine and linear aliphatic structures through self-catalytic curing process. Also, the glass transition temperature was higher than 500 °C. In contrast, the propargyl ether-containing monomer could only be partially cured, and heat resistance was found to be compromised. Compared with traditional petroleum-based phthalonitrile resins, the bio-based monomers could be cured without the addition of catalysts, and improvement in processability was achieved at no cost of thermal performances.
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CELLULOSE
·
2019
·Vol. 26
·期 17
·9335-9348
·
IF 3.917
Yang Yingying,Huang Wei,Guo Zengpei,Zhang Shiyu,Wu Feng,Huang Jingjing,Yang Hongjun,Zhou Yingshan,Xu Weilin,Gu Shaojin
Abstract Superhydrophobic cotton fabrics with improved ultraviolet resistance were prepared via in situ growing NH 2 -MIL-125(Ti)(Ti-MOF) nanoparticles on cotton fibers and subsequently coating with polydimethylsiloxane (PDMS) under room temperature. The synergetic effect of Ti-MOFs nanoparticles and PDMS was critical and essential for obtaining a superhydrophobic coating with anti-UV property. The surface microstructure, chemical composition, and superhydrophobic property of the as-prepared fabrics were characterized by K/S value, scanning electron microscopy, X-ray photoelectron spectroscopy, energy dispersive spectroscopy, and water contact angle (WCA) measurements. The as-prepared cotton fabrics not merely exhibited desirable superhydrophobic property with a water contact angle (WCA) of 154.7 ± 0.7° and a sliding angle of 3.6°, but also displayed the considerable UV resistance. The oil–water separation, stability of UV protection and superhydrophobicity were also investigated. The superhydrophobicity, anti-ultraviolet property, and K/S value of as-prepared PDMS/Ti-MOFs@cotton fabrics were stable after 300 cycles of abrasion and 5 cycles of washing. The facile synthesis technique provided a simple method for scalable construction of multifunctional fabrics. Graphic abstract
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JOURNAL OF NANOPARTICLE RESEARCH
·
2019
·Vol. 21
·期 8
·1-12
·
IF 2.009
Lu Jiayu,Xu Yanyan,Liu Wei,Wu Zhaoliang,Li Na,Shu Ting
The recovery of nano-catalysts from organic wastewater is still one of the most significant problems in the catalytic industry. In this work, froth flotation was used to solve this problem. CuO nano-particles were considered as the desired materials. First, four surfactants were screened for determining a suitable collector through comparing their foam properties and capture capacity to CuO nano-particles. Subsequently, froth flotation was performed by using cocamidopropyl betaine (CAB) as the collector. Under the suitable operation conditions, the enrichment ratio and recovery percentage of CuO nano-particles reached as high as 20.52 and 91.50%, respectively. Finally, the size distribution and morphology of CuO nano-particles before and after froth flotation were characterized. Experimental results indicated that the dispersibility of the recovered CuO nano-particles after froth flotation was better than that of the commercial CuO nano-particles due to the existence of surfactant molecules around the nano-particle surface. This work is expected to provide a new insight into the effective recovery of nano-catalysts from the downstream industrial effluent and to facilitate the industrialization of froth flotation in the green catalytic industry.
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