JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2018
·
IF 2.196
Liping Wang,Saisai Zhou,Pan Li,Pengzhou Li,Qingsong Li,Yingmin Yu
Polyoxymethylene dimethyl ethers (DMMn) have attracted particular attention in industry as excellent oxygenated fuel additives. This study aims to reveal the liquid–liquid equilibrium (LLE) values regarding ternary mixtures {water + methylal (DMM1) + 4-methyl-2-pentanol (MIBC)}, {water + DMM2 + MIBC}, {water + DMM3 + MIBC}, and {water + DMM4 + MIBC} at 298.2 and 308.2 K under 101.3 kPa. Distribution factor and selectivity were utilized to assess the extracting capabilities of the selected extractant. The well known Hand equation and Othmer–Tobias equation were utilized to test the consistency of the LLE values. In addition, the experimental results were correlated by the UNIQUAC and NRTL thermodynamic models with all of the root-mean-square deviation values less than 0.0127,which indicated that both models agree well with the experimental tie-line data.
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Xia Zhou,Qian Zhao,Guangqiang Liu,Weiping Cai
Active capture and ultrasensitive SERS-based detection of hexachlorocyclohexane (HCH) has been a challenging task. A novel strategy based on 4-mercaptophenylboronic acid (4-MPBA) surface modification on Au nanosheets-built hollow sub-microcubes (ANHCs) was proposed to capture HCH pesticides effectively via Suzuki cross coupling reaction. The ANHCs structure composed of numerous intertwined nanosheets was firstly prepared by Au nanocrystals heteroepitaxial growth on AgCl cubes. Then, the 4-MPBA molecules were selected to modify on the surface of ANHCs for SERS-based detection of HCH. The SERS results proved that active capture and ultrasensitive detection of HCH could be implemented, and the limit of detection is 0.3 ppb. Besides, 4-MPBA modified substrate show high reproducibility and sensitivity than unmodified one. Moreover, the characteristic peak intensity ratio I HCH /I 4-MPBA presents a good linear relationship with the logarithm of a certain concentrations, and achieve SERS-based quantitative detection of HCH. In addition, this strategy has been successfully used for the detection and differentiation of mixed HCH isomers in water samples. The surface modification strategy on high performance SERS substrate provides a good route for the highly ultrasensitive detection and active capture of HCH, and paves a way for the detection of organochlorine pesticide residues in water samples.
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale Research Letters
·
2015
·Vol. 10
·期 1
·1-6
·
IF 2.779
Guo Jing,Pei Yingli,Zhou Zhengji,Zhou Wenhui,Kou Dongxing,Wu Sixin
Solution-processed approach for the deposition of Cu 2 ZnSn (S,Se) 4 (CZTSSe) absorbing layer offers a route for fabricating thin film solar cell that is appealing because of simplified and low-cost manufacturing, large-area coverage, and better compatibility with flexible substrates. In this work, we present a simple solution-based approach for simultaneously dissolving the low-cost elemental Cu, Zn, Sn, S, and Se powder, forming a homogeneous CZTSSe precursor solution in a short time. Dense and compact kesterite CZTSSe thin film with high crystallinity and uniform composition was obtained by selenizing the low-temperature annealed spin-coated precursor film. Standard CZTSSe thin film solar cell based on the selenized CZTSSe thin film was fabricated and an efficiency of 6.4 % was achieved.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2014
·
IF 3.84
Dingyi Tong,Haifeng Duan,Jiajun Wang,Ziqi Yang,Yingjie Lin
An aggregation-enhanced excimer emission (AEEE) fluorophore was successfully synthesized by introducing chalcone into pyrene. Compared with the traditional AIE structure (tetra-phenylethene derivatives), pyrenylchalcone was more available under mild conditions. It exhibited weak emission when molecularly dissolved but strong excimer emission when aggregated. Then we designed a probe with good water solubility based on pyrenylchalcone for polyanion detection in aqueous media. An orange emission could be observed upon simple addition of polyacrylic acid sodium salt. Better than the other “blue-to-green” pyrene probes, this “turn-on” AEEE probe was more likely visible to eyes. Moreover, unlike the double bond in tetra-phenylethene, the unsaturated double bond in chalcone could be easily opened by thiols. It could lead to another different “turn-on” change in fluorescence. Adding biothiol and adding polyanion were two different methods to reduce the intra-molecular rotations and cause different emissions, thus we built a 2-to-4 molecular decoder in aqueous media which could be observed by naked eyes.
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2014
·
IF 4.086
Mingtao Li,Lu Wang,Bolun Yang,Tingting Du,Ying Zhang
The polymer electrolytes based on a novel poly((4-vinylbenzyl)trimethylammonium bis(trifluoromethanesulfonylimide)) polymeric ionic liquid (PIL) as polymer host and containing DEME-TFSI ionic liquid, LiTFSI salt and nano silica are prepared. The polymer electrolyte is chemically stable even at a higher temperature of 60 °C in contact with lithium anode. Particularly, the electrolyte exhibits high lithium ion conductivity, wide electrochemical stability window and good lithium stripping/plating performance. When the IL content reaches 60% (the weight ratio of DEME-TFSI/PIL), the PIL electrolyte presents a higher ionic conductivity, and it is 7.58 × 10 −4 S cm −1 at 60 °C. Preliminary battery tests show that Li/LiFePO 4 cells with the PIL electrolytes are capable to deliver above 130 mAh g −1 at 60 °C with very good capacity retention.
✓ 已验证
DOI
高影响因子
CHEMICO-BIOLOGICAL INTERACTIONS
·
2014
·
IF 2.982
Zhaoguang Lu,Junsong Wang,Minghui Li,Qingwang Liu,Dandan Wei,Minghua Yang,Lingyi Kong
A goldfish ( Carassius auratus ) model of Parkinson’s disease (PD) was constructed by a single dose of 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) according to previously reported methods. Global metabolite changes in brain of the MPTP induced goldfish model of PD were investigated. 1 H NMR-based metabolomics combined with various statistical methods such as orthogonal partial least squares discriminant analysis (OPLS-DA) and two-dimensional statistical total correlation spectroscopy (2D-STOCSY) found significant increase of leucine, isoleucine, valine, alanine, alanylalanine, creatinine, myo -inositol, 18:2 fatty acid, total fatty acids, arachic alcohol, taurine and significant decrease of N-acetylaspartate, (phospho)creatine, (phospho)choline, betaine, glutamine, 3-hexenedioate, acetamide, malonate, isocitrate, scyllo -inositol, phosphatidylcholines, cholesterols, n-3 fatty acids, polyunsaturated fatty acids (PUFAs) in brain of MPTP induced PD goldfish. These disturbed metabolite levels were involved in oxidative stress , energy failure, neuronal cell injury and death, consistent with those observed in clinical PD patients, and rodents and primates model of PD, indicating that the acute MPTP model of goldfish was an ideal and valuable model for PD research. In addition, several unusual metabolites in brain were significantly changed between MPTP induced PD and control goldfish, which might also play an important role in the pathogenesis of PD. This study also demonstrated the applicability and potential of 1 H NMR-based metabolomics approach for evaluation of animal models of disease induced by chemicals, such as MPTP-induced PD goldfish.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICA CHIMICA ACTA
·
2015
·
IF 4.513
Dan Zhao,Yao Fan,Fang Gao,Tian-ming Yang
As a new detection model, the reversible fluorescence “turn-off-on” sensor based on quantum dots (QDs) has already been successfully employed in the detections of many biochemical materials, especially in the researches on the interactions between anticancer drugs. The previous studies, however, mainly focused on simple-structured oligonucleotides and Calf thymus DNA . G-quadruplex, an important target for anti-cancer drug with special secondary structure , has been stimulating increasing research interests. In this paper, we report a new detection method based on the fluorescence “turn-off-on” model with water-soluble ZnCdSe QDs as the fluorescent probe , to analyze the interactions between anticancer drug (N-methyl-4-pyridyl) porphyrin (TMPyP) and nucleic acid , especially the G-quadruplex. The fluorescence of QDs can be quenched by TMPyP via photo-induced electron transfer and fluorescence resonance energy transfer , while on the other hand, the combination between TMPyP and G-quadruplex releases QDs from their quenchers and thus recovers the fluorescence. Most importantly, the fluorescence “turn-off-on” model has been employed, for the first time, to analyze the impacts of special factors on the interaction between TMPyP and G-quadruplex. The excellent selectivity of the system has been verified in the studies of the interactions between TMPyP and different DNAs (double-stranded DNA, single-stranded G-quadruplex, and different types of G-quadruplexes) in Na + or K + -containing buffer.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Guodong Jiang,Meng Wei,Songdong Yuan,Qing Chang
4-chlorophenol could be efficiently photoreductively dechlorinated over anatase TiO 2 nanocrystals with co-exposed {0 0 1} and {1 0 1} facets, which were synthesized and further characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Although fluorine could adsorb on {0 0 1} facets to decrease their surface energy, enabling TiO 2 to expose high energy {0 0 1} facets, the surface bonded fluorine might depress the photoreductive dechlorination efficiency of 4-chlorophenol, attributed to the electron trapping role of surface ≡Ti F groups. Due to the formation of a surface heterojunction between {1 0 1} and {0 0 1} facets in a single TiO 2 nanocrystal, electrons and holes were spontaneously self-separated and selectively migrate to {1 0 1} and {0 0 1} facets, respectively. Electron trapping experiments demonstrated that photogenerated electrons are the responsible for the reductive dechlorinaton of 4-chlorophenol to phenol. To avoid the oxidative degradation of 4-chlorophenol by holes and ensure sufficient electrons to reductively dechlorinate the substrate, moderate scavengers were required in the reaction system and dissolved oxygen, which might deplete electron on TiO 2 , also should be removed. With the optimal scavengers, the conversion efficiency of 4-chlorophenol (4-CP) achieved 97.5% and the selectivity for phenol was 92.5%, which were much higher than that of commercial TiO 2 P25.
✓ 已验证
产品关联
DOI
高影响因子
SYNTHETIC METALS
·
2015
·
IF 2.252
Haihan Zhou,Gaoyi Han,Yaoming Xiao,Yunzhen Chang,Hua-Jin Zhai
Polypyrrole/poly(sodium 4-styrenesulfonate)-carbon nanotubes (PPy/PSS-CNT) nanocomposites have been fabricated with an in situ electrochemically polymerized method. The long (10–30 μm) and short (0.5–2 μm) CNT are incorporated separately into the composites, and their effect on the capacitive performance of composites prepared is compared. Scanning electron microscope characterization reveals that long CNT-incorporated composites (PPy/PSS-lCNT) have the more porous microstructure and present a large amount of CNT within the composites, in which these long tangled CNT form an interconnected conductive nano-network. Furthermore, combining with the transmission electron microscopy characterization, both of the two types of composites show the core–shell nanostructure with PPy layer coated on CNT. The results by electrochemical tests including cyclic voltammetry (CV), galvanostatic charge/discharge (GCD), and electrochemical impedance spectroscopy (EIS) manifest the PPy/PSS-lCNT composite electrodes have the relatively more superior capacitive behavior and cycle stability than those of the short CNT-incorporated composites (PPy/PSS-sCNT) electrodes. Thereinto, the PPy/PSS-lCNT composite electrodes exhibit a high areal capacitance of 146.1 mF cm −2 at 10 mV s −1 CV scan, retaining 94.0% of the initial capacitance after 5000CV cycles. This comparative study suggests that the long CNT-incorporated PPy/PSS-lCNT nanocomposites are relatively more promising as the electrode materials for the high-performance supercapacitors.
✓ 已验证
产品关联
DOI
高影响因子
Biomed Research International
·
2013
·
IF 0
Li Lv,Yuanyuan Shen,Min Li,Xiaofen Xu,Mingna Li,Shengrong Guo,Shengtang Huang
A novel 4-arm poly(ethylene glycol)-block-poly(anhydride-esters) amphiphilic copolymer (4-arm PEG-b-PAE) was synthesized by esterization of 4-arm poly(ethylene glycol) and poly(anhydride-esters) which was obtained by melt polycondensation of α-, ω-acetic anhydride terminated poly(L-lactic acid). The obtained 4-arm PEG-b-PAE was characterized by 1H-NMR and gel permeation chromatography. The critical micelle concentration of 4-arm PEG-b-PAE was 2.38 μg/mL. The curcumin-loaded 4-arm PEG-b-PAE micelles were prepared by a solid dispersion method and the drug loading content and encapsulation efficiency of the micelles were 7.0% and 85.2%, respectively. The curcumin-loaded micelles were spherical with a hydrodynamic diameter of 151.9 nm. Curcumin was encapsulated within 4-arm PEG-b-PAE micelles amorphously and released from the micelles, faster in pH 5.0 than pH 7.4, presenting one biphasic drug release pattern with rapid release at the initial stage and slow release later. The hemolysis rate of the curcumin-loaded 4-arm PEG-b-PAE micelles was 3.18%, which was below 5%. The IC50 value of the curcumin-loaded micelles against Hela cells was 10.21 μg/mL, lower than the one of free curcumin (25.90 μg/mL). The cellular uptake of the curcumin-loaded micelles in Hela cell increased in a time-dependent manner. The curcumin-loaded micelles could induce G2/M phase cell cycle arrest and apoptosis of Hela cells.
✓ 已验证
产品关联
DOI
PubMed
MICROCHIMICA ACTA
·
2013
·Vol. 180
·期 11
·1051-1057
·
IF 3.434
Wang Ai-Jun,Guo Han,Zhang Ming,Zhou Dan-Ling,Wang Rui-Zhi,Feng Jiu-Ju
We have developed a simple, sensitive and selective colorimetric method for the detection of cadmium(II) (Cd 2+ ) using gold nanoparticles modified with 4-amino-3-hydrazino-5-mercapto-1,2,4-triazole. Organic solvents or additives are not required. It is found that Cd 2+ induces the aggregation of the modified Au-NPs via chelation, leading to a color change from red to blue. This change can be seen with bare eyes, and monitored by UV–vis spectroscopy, transmission electron microscopy and dynamic light scattering. The detection limit is 30 nM (at a signal-to-noise ratio of 3). The new approach was successfully applied to the detection of Cd 2+ in spiked samples of tap water and lake water, and the results agree well with those obtained by flame atomic absorption spectroscopy.
A simple, sensitive and selective colorimetric method was developed for the detection of Cd 2+ , where 4-amino-3-hydrazino-5-mercapto-1,2,4-triazol (AHMT) modified gold nanoparticles (AuNPs) were used as optical probes. The presence of Cd 2+ induced the aggregation of the AHMT-AuNPs through the chelation process. This approach was successfully applied for the detection of Cd 2+ in spiked samples of tap water and lake water.
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale Research Letters
·
2015
·Vol. 10
·期 1
·1-8
·
IF 2.779
Shi Chaohong,Zhu Nengwu,Cao Yanlan,Wu Pingxiao
The development of green procedure for the synthesis of gold nanoparticles (AuNPs) has gained great interest in the field of nanotechnology. Biological synthetic routes are considered to be environmentally benign and cost-effective. In the present study, the feasibility of AuNPs’ synthesis via intracellular protein extract (IPE) of Pycnoporus sanguineus was explored. The characteristics of generated particles of formation, crystalline nature, and morphology and dimension were analyzed by UV-vis spectroscopy, X-ray diffraction (XRD) and transmission electron microscopy (TEM), respectively. UV-vis spectra exhibited strong absorption peaks in 520 to 560 nm, indicating the formation of AuNPs. XRD analysis revealed that the formed AuNPs were purely crystalline in nature. TEM observation showed that AuNPs with various shapes including spherical, pseudo-spherical, triangular, truncated triangular, pentagonal, and hexagonal, ranging from several to several hundred nanometers, were synthesized under different conditions. The average size of AuNPs decreased from 61.47 to 29.30 nm as the IPE addition increased from 10 to 80 mL. When the initial gold ion concentration changed from 0.5 to 2.0 mM, the average size rose from 25.88 to 51.99 nm. As in the case of solution pH, the average size was 84.29 nm with solution pH of 2.0, which diminished to 6.07 nm with solution pH of 12.0. Fourier transform infrared (FTIR) analysis implied that the functional groups including hydroxyl, amine, and carboxyl were involved in the reduction of gold ions and stabilization of AuNPs. The catalysis results showed that 0.019 mg of AuNPs with average size of 6.07 nm could catalyze the complete degradation of 12.5 μmol of 4-nitroaniline within 6 min and the degradation rate increased drastically with the addition of AuNPs. All the results suggested that the IPE of P. sanguineus could be potentially applied for the eco-friendly synthesis of AuNPs.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）