CHROMATOGRAPHIA
·
2020
·Vol. 83
·期 8
·927-932
·
IF 1.596
Liu Xiaobo,Zhang Ying,Shang Meijie,Zhu Liping,Yu Min
The effects of furoic acid and furfuryl alcohol on the detection of furfural in transformer oil were studied using the traditional liquid–liquid extraction combined with high-performance liquid chromatography (LLE-HPLC) technology, in which, the methanol used as extraction agent and the C18 column and ultraviolet−visible detector were used as the separation and detection units for the determination of the furfural. The results show that the presence of furfuryl alcohol or furoic acid increases the extraction efficiency of furfural from 42.07 to 73.21% and 65.33%, respectively. The extraction efficiency of furfural decreases when the concentrations of furfuryl alcohol increase from 0.2 to 0.6 mg L −1 , but the extraction efficiency of furfural increases with the concentrations of furoic acid from 0.2 to 0.6 mg L −1 . This indicated that the accuracy of detection and extraction efficiency of furfural in transformer oil by LLE-HPLC technology may be affected by the furfuryl alcohol or furoic acid dissolved in transformer oil.
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CHEMICAL PAPERS
·
2020
·Vol. 74
·期 11
·4067-4074
·
IF 1.68
Xu Yan-Heng,Xu Ge,Sun Ming-Yue,Wang Kun
In this paper, polymeric graphitic carbon nitride (pgCN) with disordered in-plane and ordered inter-plane structure was prepared via a two-step method of low-temperature solvothermal synthesis and post-calcination, using dicyandiamide and cyanuric chloride mixture as raw materials and acetonitrile as solvent. Disordered in-plane structure of the pgCN was confirmed by X-ray diffraction (XRD), transmission electron microscope (TEM) and electron diffraction (ED). The microstructure, chemical states, bandgap, charge migration and photocatalytic performance of the pgCN were compared with that of classic bulk graphitic carbon nitride (bulk g-C 3 N 4 ) obtained from melamine by calcination and its post-hydrothermal product. The pgCN showed highly efficient in both the photodegradation of Rhodamine B (RhB) and hydrogen evolution reaction (HER) benefiting from disordered–ordered hybrid plane structure which can inhibit photoelectron recombination and provide higher charge separation efficiency. Under visible light irradiation, the average HER rate of pgCN could reach 4541 μmol h −1 g −1 , which is 18.2 times higher than that of bulk g-C 3 N 4 crystal.
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MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 5
·1-11
·
IF 6.232
Zhou Zhide,Zhao Le,Li Wenzhan,Chen Min,Feng Huafu,Shi Xiaohang,Liang Jintao,Li Guiyin
A Glypican-3 (GPC3) electrochemical aptamer nanobiosensor based on hemin/graphene nanohybrids (HGNs) peroxidase-like catalytic silver deposition and GPC3 aptamer has been constructed for the determination of GPC3. The HGNs were prepared by an one-step reduction method. Fourier transform infrared spectroscopy (FT-IR), ultraviolet spectroscopy (UV-vis), and transmission electron microscopy (TEM) were used to study the structure and morphological characteristics of the HGNs. The GPC3 electrochemical aptamer nanobiosensor was constructed using HGNs-aptamer (HGNs-Apt) as the signal probe and GPC3 aptamer as the capture probe. With the help of the catalytic action of peroxidase-like properties of HGNs, H 2 O 2 reduces the silver (Ag) ions in solution to metallic Ag, which deposit on the surface of the electrode. The amount of deposited Ag, which was derived from the amount of GPC3, was quantified by differential pulse voltammetry (DPV). Under optimal conditions, the current response of Ag had a good positive correlation with the GPC3 concentration in the range 10.0–100.0 μg mL −1 with a correlation coefficient of 0.9958. The detection limit was 3.16 μg mL −1 at a signal-to-noise ratio of 3, and the sensitivity was calculated to be 0.807 μA μM −1 cm −2 . The method is validated by analyzing spiked human serum samples with good recovery ranging from 101 to 122%. In addition, the GPC3 electrochemical aptamer nanobiosensor has acceptable selectivity, stability, and reproducibility.
A Glypican-3 electrochemical aptamer nanobiosensor based on hemin/graphene nanohybrids (HGNs) peroxidase-like catalytic silver deposition and GPC3 aptamer has been constructed for the determination of GPC3. The electrochemical aptamer nanobiosensor exhibits high selectivity, acceptance reproducibility, and good recovery performances.
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Scientific Reports
·
2020
·Vol. 10
·期 1
·1-9
·
IF 3.998
Zhang Lei,Weng Yi-jin,Liu Xiao,Gu Wen,Zhang Xia,Han Lei
Surface Enhanced Raman Scattering (SERS) has been widely applied in many research fields such as biological detection and chemical analysis. However, for the common Au nanoparticles, it’s too hard to guarante the three aspects: the great enhanced effect, the controllable aggregation and the uniformity of nanoparticles, the environmental friendliness and biocompatibility of nanoparticles. In this paper, phytate acid (IP6)-coated Au nanoparticles (IP6@Au NPs) are more stable and have a higher enhancement factor than Au nanoparticles. In order to achieve the uniformity of the spherical IP6-coated@Au nanoparticles (IP6@Au NPs), IP6 was used as a soft template. In the presence of IP6, IP6@Ag nanoparticles were first synthesized by reducing AgNO 3 with trisodium citrate, then IP6@Au NPs were obtained by reducing HAuCl 4 with Ag nanoparticles. The IP6@Au NPs exhibit excellent Raman signal enhancement by using p-aminothiophenol (4-ATP) as the probe molecules. The effects of Fe 3+ on the performance of IP6@Au NPs SERS substrates were also studied. The results show that SERS has the best enhancement effect when adding proper amount of Fe 3+ (0.56 PPM), and the limit of detection was 10 −7 M 4-ATP.
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WATER AIR AND SOIL POLLUTION
·
2020
·Vol. 231
·期 4
·1-10
·
IF 1.9
Ning Qin,Dong Haoran,Li Long,Wang Yaoyao,Wang Bin
In this study, the dispersion stability and reactivity of sulfide-modified nanoscale zerovalent iron (SNZVI) coated with different surface stabilizers (i.e., starch, sodium dodecylbenzene sulfonate (SDBS), or carboxymethyl cellulose (CMC)) were investigated. All the three types of surface stabilizers could enhance the dispersion stability of SNZVI but exerted differing influences on the reactivity toward trichloroethylene (TCE) removal. The coating of starch on SNZVI markedly improved TCE removal, which was positively correlated with the enhanced dispersion stability (i.e., more active surface sites). However, although the SDBS and CMC could enhance the dispersion stability of SNZVI, they resulted in an inhibition in TCE removal, especially for CMC. It was presumed that the coated SDBS/CMC on the surface of SNZVI occupied the active surface sites for TCE removal. Besides, the effect of groundwater geochemistry (i.e., pH, Ca 2+ , and humic acid (HA)) was examined. The increasing pH from 5 to 9 led to a slight decrease for all stabilized SNZVI particles. The presence of Ca 2+ or HA exerted distinct influence on the TCE removal by the three stabilized SNZVI. The Ca 2+ /HA exerted an insignificant effect on the reactivity of CMC-SNZVI but markedly decreased the reactivity of starch-SNZVI and SDBS-SNZVI. The varying effects of Ca 2+ /HA should be due to their distinct interactions with different types of stabilizers on the surface of SNZVI.
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JOURNAL OF POLYMER RESEARCH
·
2020
·Vol. 27
·期 4
·1-13
·
IF 2.426
Guo Yongliang,Cui Jinfeng,Guo Junhong,Zhang Haojun,Wang Lurong,Yang Baoping
Polystyrene (PS) with great flame retardancy has been achieved by addition of polyhedral oligomeric silsesquioxane (POSS). However, the POSS/PS composite showed easy-ignition behavior leading to fire hazard exposed. Aiming to prolong time to ignition (TTI) and improve flame retardancy simultaneously, using non-flammable modifier to decorate POSS is a facile method. Here, two kinds of POSS hybrids (POSS-ILs), denoted as POSS-EVIM and POSS-VIPSP, were synthesized by free radical copolymerization between vinyl POSS and two kinds of ionic liquid, commercial [EVIm]BF 4 and Brønsted ionic liquid, respectively. The polystyrene-based composites (POSS-ILs/PS) were prepared by incorporated POSS-ILs into polystyrene. The results of thermal gravimetric analysis test evidenced that both POSS-ILs increased char yield and decreased decomposed rate of composites. Compared with neat PS, the TTI of POSS-ILs/PS was prolonged by 26 s and 21 s, and meanwhile, the fire hazard was decreased due to reduction of peak value of heat release rate (PHRR) and smoke release rate (PSPR) in cone calorimeter test. Scanning electron microscope observed compact residue of POSS-EVIM/PS and honeycombed residual morphology of POSS-VIPSP/PS, and additionally, both of these residual char possessed higher degree of graphitization than that of PS and POSS/PS in Raman spectrum, suggesting good physical barrier for matrix from heat and oxygen. Besides, the flexural strength of both POSS-ILs/PS composites were increased compared with neat PS. Taking the results above mentioned, POSS modified by ionic liquid can be a decent candidate to prolong time to ignition, simultaneously improve fire safety and mechanical properties for polymeric materials.
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CANCER CHEMOTHERAPY AND PHARMACOLOGY
·
2020
·Vol. 85
·期 4
·699-709
·
IF 2.967
Li Ke,Zhou Yun,Chen Yulong,Zhou Liansuo,Liang Jimin
Pancreatic cancer has a high mortality rate and poor prognosis. The development of novel medicines for pancreatic cancer therapy is urgently need. Britanin is a bioactive sesquiterpene lactone, that exhibits excellent anti-inflammatory and antioxidant effects. However, the potential anti-tumour activity of britanin is also considerable. Hence, in this study, the in vitro and in vivo anti-pancreatic cancer effects of britanin were investigated. Several pancreatic cancer cell lines were applied to evaluate inhibition of proliferation, migration and NF-κB pathway in vitro. Then in vivo toxicity of britanin was evaluated in BALB/c mice. The in vivo inhibitory effects of britanin were investigated by bioluminescence imaging, traditional methods and histological analysis in a pancreatic cancer xenograft mouse model. The results showed that britanin exhibited effective anti-tumour actions both in vitro and in vivo. The IC 50 values in PANC-1, BxPC-3 and MIA CaPa-2 cell lines were 1.348, 3.367 and 3.104 μmol/L, respectively, and cell proliferation and migration were significantly inhibited by britanin treatment. Western blotting demonstrated that NF-κB family proteins, such as P50, P65, and P-P65 were affected by britanin treatment. It is worth noting that the P-P65 protein, which regulates the expression of multiple factors downstream, was significantly decreased in britanin treated group. In vivo experiments verified that britanin could suppress the tumour progression in a pancreatic cancer xenograft mouse model, while the compound did not exhibit intolerable toxicity. In conclusion, britanin has remarkable potential treatment effects against pancreatic cancer, and it could be developed as a new agent for pancreatic cancer chemotherapy.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 14
·11646-11653
·
IF 2.22
Shi Kai,Su Junhong,Hu Kai,Liang Haifeng
A wide-spectrum high-transmittance copper mesh was designed and fabricated for effective shielding of electromagnetic waves. Using mask lithography and chemical etching, the copper mesh can be easily fabricated. The thickness of the copper mesh is uniform, whether at the crossing section and the copper wire. The average transmittance of the copper mesh from ultraviolet band to near-infrared band (200–2500 nm) is 96%, in agreement with the designed results. The electromagnetic interference shielding efficiency (EMI SE) is to 16 dB in Ku-band. The result of X-ray photoelectron spectroscopy analysis shows that a large amount of Cu 2+ on the surface is reduced to Cu 0 and Cu + after annealing. As result, the EMI SE value of copper mesh has increased by 1.5 dB in Ku-band. We envision that the copper mesh can provide a good solution for optically transparent electromagnetic interference shielding.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2020
·Vol. 22
·期 6
·1-11
·
IF 2.132
Zhao Yubin,Xie Cong,Song Yuxiang,Yang Ping
The photoluminescence (PL) of doped ions is depended strongly on the position of the ion in the substrate. Ion doping endows semiconductor nanocrystals with novel properties. In this paper, Mn:CsPb(Cl/Br) 3 nanocrystals (NCs) with different halogen ratios were obtained by one-pot hot injection synthesis and halogen ion exchange. The emission of Mn 2+ from 4 T 1g - 6 A 1g d-d transition was observed in the case of changing the molar ratio of Cl/Br for Mn:CsPb(Cl/Br) 3 NCs. In the case of a Cl/Br ratio of 4/1, the PL peak of perovskite became weak and Mn 2+ emission was enhanced. After I − ion exchange, the emission of Mn 2+ was observed in Mn:CsPb(Cl/Br) 3 with Cl/Br ratio of 1/4, in which the PL efficiency of the nanocrystals reached 55.74%. Thus, Cl − ions increase the band gap and effectively promote the emission of Mn 2+ . At the same time, the morphology of the samples after ion exchange always remains cube. The lifetimes of the nanocrystals were short aged with increasing Cl − ions and prolonged with increasing I − ions. Because these Mn:CsPbX 3 (x = Cl, Br, I) NCs with different halogen ratios revealed highly stabile blue to red emission, the nanocrystals would be utilizable for further applications.
Graphical abstract
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Nature Communications
·
2020
·Vol. 11
·期 1
·1-11
·
IF 12.121
Zhang Yunxia,Liu Yucheng,Xu Zhuo,Ye Haochen,Yang Zhou,You Jiaxue,Liu Ming,He Yihui,Kanatzidis Mercouri G.,Liu Shengzhong (Frank)
The organic-inorganic hybrid lead halide perovskites have emerged as a series of star materials for solar cells, lasers and detectors. However, the issues raised by the toxic lead element and marginal stability due to the volatile organic components have severely limited their potential applications. In this work, we develop a nucleation-controlled solution method to grow large size high-quality Cs 3 Bi 2 I 9 perovskite single crystals (PSCs). Using the technique, we harvest some centimeter-sized single crystals and achieved high device performance. We find that X-ray detectors based on PSCs exhibit high sensitivity of 1652.3 μC Gy air −1 cm −2 and very low detectable dose rate of 130 nGy air s −1 , both desired in medical diagnostics. In addition, its outstanding thermal stability inspires us to develop a high temperature X-ray detector with stable response at up to 100 °C. Furthermore, PSCs exhibit high X-ray imaging capability thanks to its negligible signal drifting and extremely high stability.
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JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 25
·11535-11544
·
IF 3.553
Zeng Tianbiao,Zhang Chuhong
An oxalate-based hydrothermal approach has been applied to synthesize Ni 0.8 Mn 0.1 Co 0.1 ·C 2 O 4 ·2H 2 O “mixed oxalate,” and “mixed oxalate” has been lithiated to LiNi 0.8 Mn 0.1 Co 0.1 O 2 for Li-ion batteries cathode. Ni 2+ , Mn 2+ and Co 2+ can be precipitated quickly and effectively at 100 °C within 20 min without inert gas protection, and it was not needed to control the pH of the solution deliberately. After the “mixed oxalate” was lithiated to LiNi 0.8 Mn 0.1 Co 0.1 O 2 , as-synthesized LiNi 0.8 Mn 0.1 Co 0.1 O 2 can deliver 160–180 mAh g −1 at 1C during long-term cycling and showed one of the best electrochemical performances compared to some Ni-rich or Ni/Mn/Co-contained cathodes synthesized by similar procedures, i.e., higher reversible capacity in rate charge/discharge cycles. Considering the facile synthesis of “mixed oxalate,” this work may give rise to an inspiration for LiNi x Mn y Co 1− x − y O 2 cathodes research.
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INTERNATIONAL JOURNAL OF CARDIOVASCULAR IMAGING
·
2020
·Vol. 36
·期 5
·841-854
·
IF 1.969
Bi Liangliang,Zhang Huaxing,Han Ruoling,Chen Wei,Zhao Na
This study compared the potential ability of multinomial echocardiographic parameters in early detection, prediction and combined diagnosis of antineoplastic-related cardiotoxicity. Male Balb/c mice were repeatedly administered with low doses of epirubicin (6 × 3 mg/kg; n = 20) to induce cardiac injury or with placebo as control ( n = 10). Conventional and strain parameters as well as myocardial performance index (MPI) were analyzed at baseline, 1 day after the second, fourth and sixth cycle, and 12 days after completion of chemotherapy (as follow-up) by a high-resolution rodent ultrasound machine. After the experiment, serum cTnI levels were measured, and myocardial injury was evaluated by histological analyses. Thirteen mice developed cardiotoxicity after epirubicin exposure. Global longitudinal (GLS), radial strain (GRS) and longitudinal strain rate (LSR) were markedly decreased (all P ≤ 0.01) and MPI was increased ( P ≤ 0.05) at the completion of treatment compared with baseline values. GLS expressed the best correlations with myocardial pathological injury, especially with collagen content (ρ = − 0.68, P < 0.01). Additionally, GLS and MPI were associated with serum cTnI levels. A > 9.5% decrease in GLS from baseline to the fourth cycle of chemotherapy could predict future cardiotoxicity (odds ratio = 0.331, P < 0.05). GLS (cutoff value, − 15.16%) combined with MPI (cutoff value, 0.64) could improve the accuracy of diagnosing cardiotoxicity (sensitivity, 92%; specificity, 87%). GLS was the only predictor of cardiotoxicity. GLS combined with MPI may provide a noninvasive and accurate method for the early detection of cardiotoxicity.
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