JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 54
·期 7
·5877-5897
·
IF 2.993
Zhang Jiancheng,Li Liping,Guo Ruilu,Zhou Haorui,Li Zhiming,Chen Guangxin,Zhou Zheng,Li Qifang
Methacryloxypropyl-polyhedral oligomeric silsesquioxane (MAP-POSS) was photopolymerized with the tri- or tetra-functional thiol monomer in different stoichiometry. A novel inorganic–organic methacrylate hybrid material with highly cross-linked network and high performance was synthesized by UV-initiated thiol–ene click chemistry. SEM–EDAX images and XRD diffractograms showed that no agglomeration of MAP-POSS was observed, indicating MAP-POSS dispersed uniformly in the hybrid materials. Real-time FTIR was employed to monitor the conversion of thiol and methacrylate as a function of irradiation time, and the results revealed that highly thiolated monomer could promote the conversion of methacrylate effectively because of stronger chain propagation capability. The TGA indicated that the hybrid materials had high thermal stability of which the onset decomposition temperature rose to 350 °C, approximately 50 °C higher than that of the traditional UV-cured epoxy acrylate/triethylene glycol dimethacrylate (EA/TEGDMA, 70:30 w/w) resin. The highest glass transition temperature ( T g ) of the hybrid materials was 76.2 °C. Compared with traditional EA/TEGDMA resins, the novel hybrid materials consisted of MAP-POSS had fast curing rate, high mechanical properties and thermal stability which made the wider practical applications of UV-cured hybrid materials feasible.
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Food Analytical Methods
·
2018
·Vol. 11
·期 11
·3095-3102
·
IF 2.245
Wang Hai-Bo,Li Yang,Bai Hong-Yu,Zhang Zi-Ping,Li Yong-Hong,Liu Yan-Ming
In this work, a rapid and label-free fluorescent sensing method has been established for tetracycline (TC) detection by using poly(adenine) (poly A) DNA-templated Au nanoclusters (AuNCs) as fluorescence indicator. The obtained AuNCs exhibited excellent fluorescence intensity and good stability. In the presence of tetracycline, the fluorescence intensity of AuNCs was obviously reduced due to the interactions between the tetracycline and the poly A DNA-templated AuNCs. Under the optimum conditions, the strategy permitted sensitive detection of tetracycline in a linear range from 0.1 to 60 μM and with a limit of detection of 20 nM. In addition, the sensor was successfully applied to determinate the tetracycline content in milk samples. More importantly, it could be easily performed within 10 min at room temperature. Thus, it could provide a rapid, convenient, label-free, and high-sensitive fluorescent platform for tetracycline detection.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 21
·21164-21175
·
IF 2.8
Kong Qiaoping,Wei Chaohai,Preis Sergei,Hu Yun,Wang Feng
The need in simultaneous removal of heavy metals and organic compounds dictates the development of synthetic adsorbents with tailor-made properties. A nitrogen (N) and sulfur (S) co-doped graphene-based aerogel (GBA) modified with 2,5-dithiobisurea was synthesized hydrothermally for simultaneous adsorption of Cd 2+ and organic dyes—safranin-O (SO), crystal violet (CV), and methylene blue (MB). 2,5-Dithiobisurea was used as nitrogen and sulfur sources to introduce N and S-containing functional group onto graphene oxide. The adsorption mechanism of GBA towards Cd 2+ and organic dyes was studied by Dumwald-Wagner models and the results showed that surface and intraparticle diffusion was the key factor in controlling the rate of adsorption. The maximum adsorption capacities of GBA towards Cd 2+ , SO, CV, and MB comprised 1.755, 0.949, 0.538, and 0.389 mmol/g in monocomponent system, respectively. Adsorption synergism was observed with respect to Cd 2+ in presence of the dyes. The performance of GBA with respect to Cd 2+ removal from binary solutions, Cd 2+ -SO, Cd 2+ -CV, and Cd 2+ -MB, was enhanced by the presence of the dyes significantly, while the adsorption capacities towards the dyes were not affected by the presence of Cd 2+ .
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RARE METALS
·
2018
·Vol. 37
·期 6
·520-526
·
IF 1.5
Mushtaq Muhammad,Guo Xian-Wei,Bi Jie-Peng,Wang Zhao-Xiang,Yu Hai-Jun
The rechargeable Li–CO 2 battery has attracted much attention for energy storage because of the high energy density and efficient utilization of greenhouse gas. However, it’s still suffered by low safety issue of liquid electrolyte. Herein, a composite cathode consisting of CNTs and polymer electrolytes was fabricated by the in-situ polymerization process for the polymer electrolyte-based solid-state Li–CO 2 batteries. With the good dispersion of CNTs and polymer electrolyte, the composite cathode is covered by film-like discharge products Li 2 CO 3 . Furthermore, the Li–CO 2 battery shows high reversible capacity (~ 11,000 mAh·g −1 ), excellent cycle stability (1000 mAh·g −1 for 100 cycles) under low charge potential (< 4.5 V), and outstanding rate performances at room temperature, which are much better than those of liquid electrolyte-based battery. Therefore, the polymer electrolyte-based Li–CO 2 battery prepared by this strategy can be a promising candidate to meet the demands of high safety and high-performance energy storage devices.
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POLYMER BULLETIN
·
2018
·Vol. 75
·期 12
·5777-5793
·
IF 1.589
Li Linshuang,Xu Yong,Che Jianfei,Su Xu,Song Chaoran
In order to investigate the effect of trifluoromethyl (–CF 3 ) group on the optical, dielectric, hydrophobic properties and degradation kinetics of transparent fluorinated polyimides, three kinds of fluorinated polyimides, 6FDA-TFMB, 6FDA-ODA and ODPA-TFMB, were prepared from 4,4′-(hexafluoroisopropylidene)diphthalic anhydride(6FDA), 4,4-oxydiphthalic anhydride(ODPA), 2,2′-bis(trifluoromethyl)-[1,1′-biphenyl]-4,4′-diamine(TFMB) or 4,4′-oxydianiline(ODA) by thermal imidization. The chemical structures were characterized by Fourier transform infrared and 1 H NMR spectra. The fluorinated polyimides exhibited good optical properties with the cutoff wavelength ( λ 0 ) low to 330 nm. They had tensile strength, modulus of elasticity and elongation at break in the ranges of 75.7–105.3, 4.9–12.3 MPa and 6.8–16.1%, respectively. They also exhibited low dielectric constants ranging from 2.85 to 3.38 and excellent hydrophobic properties with water absorptions below 0.65% and water contact angles beyond 103.3°. The 5% weight loss temperature ( T 5% ) was up to 480 °C, and the 10% weight loss temperature ( T 10% ) was beyond 518 °C, indicating that the resulting fluorinated polyimides exhibited excellent thermal stability. Moreover, the thermal degradation kinetics of the resulting fluorinated polyimides were investigated by thermogravimetric analysis at various heating rates under nitrogen atmosphere. The average apparent activation energy ( E a ) of the resulting fluorinated polyimides was calculated by using Flynn–Wall–Ozawa method, Kissinger–Akahira–Sunose method and Kissinger method without any knowledge of reaction mechanism.
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Nano Research
·
2018
·Vol. 11
·期 9
·4905-4913
·
IF 7.994
Chen Jinxing,Wang Qingqing,Huang Liang,Zhang Hui,Rong Kai,Zhang He,Dong Shaojun
Despite the intrinsic peroxidase-like activity of Prussian blue nanoparticles (PBNPs), their enzyme-mimic mechanism has been scarcely investigated to date. Herein, we probed the catalytic site of PBNPs for the first time, by comparing their peroxidase-like activity with that of a series of Prussian blue analogs (PBAs) in which Fe atoms were replaced by Co, Ni, and Cu. The PBNPs exhibited the highest maximal reaction velocity (1.941 μM·s −1 ), which was at least 13 times higher than that of the PBAs, demonstrating that the peroxidase-like properties of PBNPs could be ascribed to the FeN x ( x = 4–6) instead of the FeC 6 units. Notably, the PBNPs/H 2 O 2 couple also showed much higher oxidizability than ·OH radicals produced from the Fenton reaction, implying that a high active Fe(IV)=O intermediate might be formed in the FeN x units. This study can thus pave the way for the wider application of PBNPs in biomimetic reactions.
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COLLOID AND POLYMER SCIENCE
·
2018
·Vol. 296
·期 7
·1119-1126
·
IF 1.967
Yu Miao,Qiao Xiuying,Dong Xingjian,Sun Kang
In this study, a series of shear thickening fluids based on the suspension of silica nanoparticles in polyethylene glycol (PEG) were prepared, and the influences of particle size, concentration, and shear on the shear thickening effect were investigated by rheological measurements. It was observed that with the increase of silica concentration, the viscosity and critical shear rate of the fluid become higher, and the shear thickening phenomenon becomes more obvious. Under the same particle concentration, higher shear thickening effect and lower critical shear thickening concentration appear for smaller nanoparticles but for larger micro particles. As the temperature increases, the enhanced Brownian motion leads to the rising of critical shear rate and the strengthening of shear thickening effect. The rheological properties of these fluids are very sensitive to the shear rate with fast viscosity change for response, and smaller nanoparticles can recover their network structures more easily after shear breakage.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2018
·Vol. 29
·期 17
·14803-14812
·
IF 2.324
Zhang Kun,Li Na,Wang Yi,Ma Xiaoxuan,Zhao Jiupeng,Qiang Liangsheng,Hou Shuai,Ji Junyi,Li Yao
A improved bifunctional nanostructure composite was designed and fabricated as reversible electrodes for electrochromic film and lithium-ion battery. This unique optic-electro responsive urchin-like architecture assembled from WO 3 @PANI nanobelts were prepared by solvothermal and electropolymerization methods. As expected, the composite exhibits the superior optical-electrochemical performances. The composite owns quick switching time ranging from purple, green, yellow, gray to blue via voltage regulation, better rate performance and long-term cycling stability in the galvanostatic charge/discharge process. Benefited from stable structure and short diffusion path, it also demonstrates a distinct optical modulation (△T = 45%) and excellent durability after long-term cycles (1200 cycles). The as-prepared electrode exhibits outstanding cycling stability (capacity retention of 516 mAh g −1 after 1200 cycles with a low average fading capacity of ca. 0.103 mAh g −1 and fading cyclic rate of ca. 0.02% per cycle). The long-term stability studies reveal that urchin-like composite has much more excellent optical and electrochemical durability. The morphology and structure of the composite were carried out by characterization equipment. This effective synthesis strategy will have profound implications for developing the other inorganic–organic nanocomposites in optical and electrochemical field.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN MEDICINE
·
2018
·Vol. 29
·期 7
·1-13
·
IF 2.448
Song Xi,Cui Siyuan,Li Zhentao,Jiao Yanpeng,Zhou Changren
Chitin/graphene oxide (Ch/GO) composite sponges had been synthesized in 11 wt% NaOH/4 wt% urea aqueous solution by a simple method. The structure, thermal stability and mechanical properties of the composite sponges were investigated by scanning electron microscopy, Fourier-transform infrared spectroscopy, wide-angle X-ray diffraction, thermogravimetric analysis, and compressive strength measurements. The results revealed that chitin and GO were mixed homogeneously. Interestingly, the composite sponges showed meso-macroporous structure, which played an important role in improving their adsorption properties. Besides, thermal stability and mechanical properties were significantly improved compared with pure chitin sponges. Taking advantages of these fantastic characteristics, the maximum adsorption capacity of composite sponges for bilirubin was up to 422.9 mg/g under the optimized condition, which was not only significantly higher than the adsorption capacities of pure chitin sponges, but also superior to those of many reported adsorbents for removal of bilirubin. Furthermore, blood compatibility evaluations confirmed that this blended sponges had negligible hemolysis and coagulation. Therefore, this work provided a potential possibility to offer Ch/GO composite sponges for removal of bilirubin.
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BMC Nephrology
·
2018
·Vol. 19
·期 1
·1-12
·
IF 2.395
Yang Huan,Male Musa,Li Yang,Wang Ning,Zhao Chenming,Jin Shan,Hu Juncheng,Chen Zhiqiang,Ye Zhangqun,Xu Hua
Background Substrate reduction therapy with analogs reduces the accumulation of substrates by inhibiting the metabolic pathways involved in their biosynthesis, providing new treatment options for patients with primary hyperoxalurias (PHs) that often progress to end-stage renal disease (ESRD). This research aims to evaluate the inhibition efficacy of Hydroxy-L-proline (HYP) analogs against calcium oxalate (CaOx) crystal formation in the Drosophila Melanogaster ( D. Melanogaster ) by comparing them with Pyridoxine (Vitamin B6). Methods Three stocks of Drosophila Melanogaster (W 118 , CG3926 RNAi, and Act5C-GAL4/CyO) were utilized. Two stocks (CG3926 RNAi and Act5C-GAL4 /CyO) were crossed to generate the Act5C > dAGXT RNAi recombinant line (F 1 generation) of D. Melanogaster which was used to compare the efficacy of Hydroxy-L-proline (HYP) analogs inhibiting CaOx crystal formation with Vitamin B 6 as the traditional therapy for primary hyperoxaluria. Results Nephrolithiasis model was successfully constructed by downregulating the function of the dAGXT gene in D. Melanogaster ( P -Value = 0.0045) . Furthermore, the efficacy of Hydroxy-L-proline (HYP) analogs against CaOx crystal formation was demonstrated in vivo using D. Melanogaster model; the results showed that these L-Proline analogs were better in inhibiting stone formation at very low concentrations than Vitamin B 6 (IC 50 = 0.6 and 1.8% for standard and dietary salt growth medium respectively) compared to N-acetyl-L-Hydroxyproline (IC 50 = 0.1% for both standard and dietary salt growth medium) and Baclofen (IC 50 = 0.06 and 0.1% for standard and dietary salt growth medium respectively). Analysis of variance (ANOVA) also showed that Hydroxy-L-proline (HYP) analogs were better alternatives for CaOx inhibition at very low concentration especially when both genetics and environmental factors are intertwined ( p < 0.0008) for the dietary salt growth medium and ( P < 0.063) for standard growth medium. Conclusion Addition of Hydroxy-L-Proline analogs to growth medium resulted in the reduction of CaOx crystals formation. These analogs show promise as potential inhibitors for oxalate reduction in Primary Hyperoxaluria.
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MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 7
·1-8
·
IF 5.705
Wen Haibin,Jiang Peichun,Hu Yuling,Li Gongke
Poly(3,4-dihydroxy-L-phenylalanine) (polyDOPA) is a stable and biocompatible reducing agent. A versatile strategy is described here for the synthesis of core-shell Au@Ag nanostructures containing a polyDOPA interlayer. The latter provides abundant sites for deposition of nanocomposites, to immobilize molecules and to grow shells. The Au@polyDOPA@Ag nanoparticles are shown to generate strong and stable surface-enhanced Raman spectroscopy (SERS) signals compared to bare AuNPs and bare AgNPs. Folic acid was then immobilized on Au@polyDOPA@Ag nanoparticles and then applied to SERS imaging of human lung adenocarcinoma cell line A549 by the specific recognition of the folic acid receptor. The folic acid-conjugated SERS tags were promising to be nanoplatforms for imaging of cancer cells.
An Au@Ag core-shell nanostructures SERS nanotag with a polyDOPA interlayer was fabricated and then applied to SERS imaging of epithelial cells. (DOPA: 3,4-Dihydroxy-[ L -phenylalanine]; FA: folic acid; 4-MBA: 4-mercaptobenzoic acid).
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JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 20
·14398-14411
·
IF 2.993
Zhang Cheng,He Shuai,Wang Dingfei,Xu Fang,Zhang Fengxiu,Zhang Guangxian
A novel smart Janus membrane for unidirectional water transfer and oil–water separation is facilely fabricated by coating graphene nanoplatelets (GNs) onto one side of polyethylene terephthalate (PET) fabric through high-temperature and high-pressure method and subsequently grafting phosphoric acid (HP) into the other side of PET fabric. Results suggest that the prepared HP–PET–GNs Janus membrane with heterogeneous surface wettability attributed to the hierarchical structure of membrane shows special unidirectional water transfer property. The water droplet can penetrate across the membrane from the GNs-coated (hydrophobic) side to the HP-grafted (hydrophilic) side, and be blocked to pass through the membrane from hydrophilic side to hydrophobic side. Moreover, the HP–PET–GNs Janus membrane is found to have the maximum water flux and separation efficiency of 2073 ± 207 Lm −2 h −1 and 99.5 ± 0.2% for methylbenzene–water mixture, and the maximum oil flux and separation efficiency of 3113 ± 52 Lm −2 h −1 and 99.6 ± 0.1% for carbon tetrachloride–water mixture, respectively. The water separation efficiency and oil separation efficiency could arrive at 99.0 ± 0.1 and 99.3 ± 0.2% even after 10 separation cycles, respectively. It is revealed that the obtained Janus membrane has excellent separation capability for separating the layered oil–water mixtures and possesses wonderful recyclability.
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