CHINESE JOURNAL OF POLYMER SCIENCE
·
2019
·Vol. 37
·期 11
·1152-1161
·
IF 2.804
Shi Lei,Zhang Ruo-Yu,Ying Wu-Bin,Hu Han,Wang Yu-Bin,Guo Ya-Qian,Wang Wen-Qin,Tang Zhao-Bin,Zhu Jin
Thermoplastic poly(ether-ester-urethane)s were synthesized from poly(L-lactide) diols (PLLA diols), polytetrahydrofuran diol (PTMG diols), 4,4′-dicyclohexylmethane diisocyanate (HMDI), and 1,4-butanediol (BDO) by a two-step reaction, and the morphology and property of the resultant TPU could be adjusted by varying the PLLA contents. The soft segment was composed of PLLA and PTMG diols. By controlling the percentage of PLLA in the soft segment, the glass transition temperature and mechanical properties of the polyurethanes could be regulated. Based on the FTIR spectrum, we found that two kinds of hydrogen bonding existed individually in soft matrix and hard domain. The hydrogen bonding in soft matrix was unstable, which could be destroyed during elongation. With in situ stretching WAXS and SAXS experiments, we found that the PLLA crystal was destroyed and the PLLA domain oriented along the stretch direction. Finally, we proposed a schematic model to illustrate the microstructures of these elastomers before and after stretch.
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WATER AIR AND SOIL POLLUTION
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2019
·Vol. 230
·期 6
·1-12
·
IF 1.774
Yang Min,Ke Junfeng,Zhang Qiwu,He Xiaoman
Surfactants are considered promising and practical substances for enhancing polycyclic aromatic hydrocarbon (PAHs) removal from contaminated soil. In order to explore the effects of single and mixed surfactants on the removal of high-concentration PAHs from soil, a series of experiments have been conducted. In this study, Tween80-saponin (a mixed surfactant), Tween80 (a nonionic surfactant), and saponin (a biosurfactant) were used to remove two typical and high concentration PAHs (anthracene and pyrene) from contaminated soil. Results showed that the mixed surfactant had better performance on the solubilization of anthracene and pyrene than Tween80, but its performance was worse than saponin. When the proportion and concentration of the mixed surfactant were 1:9 and 800 mg L −1 respectively, the elution rate of anthracene could reach 97.67%, it was better than that by Tween80 and saponin. In addition, the Tween80-saponin mixed surfactant had good performance on actual PAHs contaminated soil remediation. When the proportion and concentration of Tween80-saponin were 1:9 and 800 mg L −1 respectively, the PAHs elution rate of actual contaminated soil could reach 81.31%.
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Nature Communications
·
2019
·Vol. 10
·期 1
·1-10
·
IF 11.878
Yang Bo,Pan Weicheng,Wu Haodi,Niu Guangda,Yuan Jun-Hui,Xue Kan-Hao,Yin Lixiao,Du Xinyuan,Miao Xiang-Shui,Yang Xiaoquan,Xie Qingguo,Tang Jiang
X-ray detectors are broadly utilized in medical imaging and product inspection. Halide perovskites recently demonstrate excellent performance for direct X-ray detection. However, ionic migration causes large noise and baseline drift, limiting the detection and imaging performance. Here we largely eliminate the ionic migration in cesium silver bismuth bromide (Cs 2 AgBiBr 6 ) polycrystalline wafers by introducing bismuth oxybromide (BiOBr) as heteroepitaxial passivation layers. Good lattice match between BiOBr and Cs 2 AgBiBr 6 enables complete defect passivation and suppressed ionic migration. The detector hence achieves outstanding balanced performance with a signal drifting one order of magnitude lower than all previous studies, low noise (1/ f noise free), a high sensitivity of 250 µC Gy air −1 cm –2 , and a spatial resolution of 4.9 lp mm −1 . The wafer area could be easily scaled up by the isostatic-pressing method, together with the heteroepitaxial passivation, strengthens the competitiveness of Cs 2 AgBiBr 6 -based X-ray detectors as next-generation X-ray imaging flat panels.
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高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
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2019
·Vol. 29
·期 6
·2003-2011
·
IF 1.637
Hua Rui,Li He,Liu Xiao-Qin,Liu Ding-Hua
With an increasing demand for green chemistry and sustainable development, it is needed to design a solid base with high catalytic activity, excellent stability and reusability. In this work, a new kind of magnetic solid basic catalyst KF/CaO–CoFe 2 O 4 was prepared by the method including co-precipitation and isochoric impregnation, and it was successfully applied in the preparation of polycarbonate diol (PCDL) from the transesterification of 1,4-butanediol with dimethyl carbonate. The characteristics and properties of the catalyst were examined and analyzed by XRD, TEM, CO 2 -TPD and VSM. The effects of various parameters such as shell-core mole ratio, KF loading, calcination temperature, catalyst dosage, and the mole ratio of the raw materials on the yield of PCDL were investigated and the yield of PCDL can reach to 71.2% under the optimal reaction conditions. In addition, the catalyst can be easily separated by an external magnet after reaction, and the catalytic activity of the catalyst can well be maintained for 4 cycles.
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Journal of Inorganic and Organometallic Polymers and Materials
·
2019
·Vol. 29
·期 6
·2083-2089
·
IF 1.637
Song Peng,Tu Yu,Shen Xiaoping,Yuan Aihua,Zhai Linzhi,Shah Sayyar Ali
Silk fibroin (SF) derived composites play an important role in regenerative medicine and tissue engineering fields. In this study, through a simple, yet green and sustainable approach, ZIF-8@SF composite was firstly prepared, and its morphological, structural, thermal and mechanical properties were systematically studied. After ZIF-8 feeding, no marked side effect for silkworms was found. The as-prepared composite had 3% of ZIF-8, and a maximum strain of 28%, which was 17% higher than that of the natural SF. Results from SEM, FTIR, XRD and TGA showed that the essential characteristics of SF were well inherited with ZIF-8 addition, suggesting that ZIF-8@SF had a great potential of being used in bio-relevant fields. Noticeably, this study is the first time to develop ZIF-8@SF composite, and the in vivo feeding approach is very promising for commercial production.
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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.
Graphical abstract
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CELLULOSE
·
2019
·Vol. 26
·期 5
·3387-3399
·
IF 3.917
Zhang Chuanjie,Tian Jiaxin,Rao Weida,Guo Bin,Fan Lingling,Xu Weilin,Xu Jie
Metal-organic frameworks (MOFs) are recently attracting more and more interests as supercapacitor electrode materials. However, their low conductivity largely thwarts their capacitance performance. Herein, fabric electrodes for flexible supercapacitors were successfully fabricated by depositing polypyrrole (PPy) nanotubes and Zr-based MOF (UiO-66) particles on cotton fabrics. The PPy nanotubes could serve as conductive connectors to bridge the UIO-66 particles due to their superior conductivity with one-dimensional structure. The conductivity of the PPy@UIO-66@cotton fabric electrode was increased to 14.29 S cm −1 . A specific capacitance of 565 F g −1 at a current density of 0.8 mA cm −2 was obtained for the PPy@UIO-66@cotton fabric electrode. In addition, the proposed fabric electrode exhibited good cycling stability with capacitance retention of 90% after 500 charge–discharge cycles and excellent rate capability. This study confirmed the combination of MOFs and PPy nanotubes has great application prospect in fabric-based flexible supercapacitors.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2019
·Vol. 411
·期 25
·6687-6695
·
IF 3.286
Dong Wenjuan,Wang Ruiping,Gong Xiaojuan,Dong Chuan
Fluorescence resonance energy transfer (FRET) is a kind of energy transfer mechanism depending on the distance between donor and acceptor, which exhibited potential application in biosensors. In this study, an efficient fluorescence “turn-on” strategy for the detection of glutathione (GSH) has been established based on FRET between nitrogen and sulfur dual-doped carbon dots (N,S-CDs) and gold nanoparticles (Au NPs). A novel N,S-CDs was synthesized by a one-pot hydrothermal treatment of 3-aminothiophenol, which possessed excellent fluorescence property with the maximum emission wavelength of 530 nm. Then, the as-prepared N,S-CDs served as energy donor to transfer energy to Au NPs via FRET process, resulting in fluorescence quenching of N,S-CDs. However, the fluorescence of N,S-CDs was recovered efficiently by adding GSH into the mixture solution of N,S-CDs and Au NPs. Therefore, the FRET assembly of N,S-CDs and Au NPs was used as a fluorescence probe for the “turn-on” sensing GSH with the linear range from 3.8 to 415.1 μM and the limit detection of 0.21 μM. This nanosensor platform was employed to monitor GSH in serum samples with satisfying results.
Graphical abstract
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APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
·
2019
·Vol. 190
·期 2
·423-436
·
IF 2.14
Zhang Liquan,Chen Xuefang,Zhang Hairong,Guo Haijun,Wang Can,Wang Mengkun,Yao Shimiao,Lin Xiaoqing,Chen Xinde
Lignocellulosic hydrolysate contains complex nonsugar compounds and undegraded sugars in the process of preparing platform compound levulinic acid (LA) and furfural by one-step dilute-acid hydrolysis. For efficiently and comprehensively utilizing the hydrolysate, a series of polar modified resins were synthesized for adsorption and separation of the sugarcane bagasse hydrolysate to obtain platform compounds and fermentable hydrolysate simultaneously. The adsorption capacities of LA and furfural were optimized to 85.32 mg/g and 33.55 mg/g on polar modified resin prepared with 80 wt% glycidyl methacrylate (GMA -80), which was much higher than nonpolar resin (4.16 mg/g and 16.14 mg/g). GMA-80 obtained the best comprehensive adsorption property, whose desorption rates were 99.90% and 89.86% for LA and furfural, respectively, and its regeneration performance was also excellent, indicating that the resin is a potential adsorbent and expected to be used in the separation and purification of the lignocellulosic hydrolysate.
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JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 54
·期 22
·14243-14254
·
IF 3.442
Wu Wenting,Zhou Yuming,Xu Ran,Hu Saichun,Wu Yangjin,He Qiang,He Man,Bu Xiaohai,Nan Qiuli,Yang Xiaoming
The first snail shell-shaped helical polyacetylenes (SHPAs) were synthesized from the copolymerization between l -serine-grafted propargylamine (LSA) and propargylamine (PA). The novel structure was obtained at the monomer input proportion of 50%. The monomer (LSA) and copolymers (poly(LSA m - co -PA n )) were characterized by 1 H nuclear magnetic resonance, Fourier transform infrared spectroscopy, ultraviolet visible spectroscopy, circular dichroism and transmission electron microscopy. The infrared emissivity of poly(LSA 50 - co -PA 50 ) investigated at 8–14 μm was 0.451, which was much lower than the other copolymers. This was because the poly(LSA 50 - co -PA 50 ) could form the obvious intramolecular interaction and self-assembled to a snail-shell shape by intermolecular hydrogen bonding in MeOH solution. Meanwhile, the conjugation performance of the main chain was enhanced. Consequently, the abundant hydrogen bonds formed through N–H and C=O bonding and the strong conjugate properties both could decrease the unsaturation degree, as well as change the heat conduction mode in the molecules, thereby reducing the infrared emissivity. This strategy provided a new direction to achieve the controllable infrared stealth.
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KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2019
·Vol. 36
·期 7
·1042-1050
·
IF 2.476
Wang Shuai,Lyu Li,Sima Guobao,Cui Ying,Li Baoxia,Zhang Xueqin,Gan Linhuo
A sulfonated lignin-derived mesoporous carbon (LDMC-SO 3 H) was prepared from kraft lignin (KL) using phenolation and soft-template method followed by sulfonation. LDMC-SO 3 H bearing a sulfonic acid density of 0.65 mmol/g possessed a well-ordered 2D hexagonal mesoporous characteristics with mesopore volume of 0.067 cm 3 /g and specific surface area of 262 m 2 /g as well as mesopore size of 3.42 nm. A high 5-hydroxymethylfurfural (5-HMF) yield of 98.0% with a full fructose conversion was obtained using LDMC-SO 3 H as catalyst under the optimized reaction conditions of reaction temperature and time of 140 °C and 120 min, initial fructose concentration of 100 g/L, catalyst load of 0.1 mg/mg in DMSO. Furthermore, there was no obvious decrease in 5-HMF yield (≥95.0%) within the five-cycle experiment, highlighting the superior reusability and stability of LDMC-SO 3 H in fructose-to-5-HMF transformation.
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JOURNAL OF POLYMER RESEARCH
·
2019
·Vol. 26
·期 9
·1-11
·
IF 1.53
Xiong Xiaopeng,Huo Peng,Xie Haitao
A free-standing Ni 3 S 2 @polypyrrole core-shell nanorod arrays have been successfully prepared and been directly used as supercapacitor. First, needle-like Ni 3 S 2 nanorods array was grown on Ni foam through a hydrothermal process, and was then electrochemically deposited with polypyrrole (PPy) layer. The composition, microstructure, and morphology of the obtained composite material have been studied by attenuated total reflection Fourier transform infrared spectroscopy, X-ray diffraction and scanning electron microscope. Our results indicate that the needle-like Ni 3 S 2 nanorods with diameter about 200 nm and 3 μm in length have grown evenly on Ni foam, and the thickness of the coated PPy layer can be tuned by the electrodeposition time. The electrochemical properties of the obtained free-standing Ni 3 S 2 /Ni@PPy composite foam have been evaluated by a three-electrode system. Our results reveal that the composite foam with the PPy shell layer about 300 nm in thickness displays the best performance, and the area specific capacitance was measured to be over 5 times that of the Ni 3 S 2 /Ni foam to reach 55.4 mF/cm 2 . The improvement has been attributed to the unique hierarchical core-shell microstructure and to the proper amount of PPy deposition. Moreover, the electrochemical stability of the material has been checked to indicate its potential as high-performance supercapacitors.
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