2015年3期 (共 篇) 引用文章 全选
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UO22+, which is extracted from the aqueous phase into the 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (C2mimNTf2) ionic liquid phase with octyl(phenyl)-N,N-diisobutylcarbamoylmethylphosphine oxide (CMPO), can be stripped by supercritical CO2. Trioctylphosphine oxide (TOPO), the modifier added to the supercritical CO2 phase, enhances the stripping efficiency by up to 99%.
本平台内已出版文章查询 , Ashanul Haque 已出版文章查询
本平台内已出版文章查询 , Zeid A.Al-Othman 已出版文章查询
本平台内已出版文章查询 , Abdulrahman Al-Warthan 已出版文章查询
本平台内已出版文章查询 , Leonid Asnin 已出版文章查询
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Dipeptides are stereo-specifically involved in several biological functions that are challenging to separate enantiomerically. Elution order of enantiomers is an important issue in chiral chromatography. Amylose tris-(3,5-dimethylphenylcarbamate) chiral stationary phase (CSP) is the best and most-widely-used CSP in chiral separations, but experimental data of enantiomeric separation of dipeptides on this CSP is lacking. Simulation studies were conducted to determine the order of elution and the chiral recognition mechanism of didpetides on this CSP. Results indicated that the docking energy of SR-enantiomers were higher than SS-antipodes. The range of docking energies for SR-enantiomers was -7.44 to -5.92 kcal/mol with CSP, but -7.15 to -5.87 kcal/mol for SS-stereoisomers. Therefore it is predicted that SS-enantiomer will elute first, followed by SR-antipode. Furthermore, hydrogen bondings, van der Waal's interactions and electrostatic interactions were observed among SR- and SS- enantiomers and chiral grooves of CSP. The number of hydrogen bonds was one in each enantiomer binding except S-Ala-R-Tyr, which contained two hydrogen bonds. No hydrogen bond was found in S-Ala-R-Trp, S-Leu-S-Trp, and S-Leu-S-Tyr dipeptides bindings. The chiral recognition mechanisms dictate different strengths of stereoselective bindings of the enantiomers on CSP.
Synthesis and fluorescence properties of a 1,3-disubstituted thiacalixarene crown-5 armed with phenothiazine moieties
本平台内已出版文章查询 , Lan Mu 已出版文章查询
本平台内已出版文章查询 , Xi Zeng * 已出版文章查询
本平台内已出版文章查询 , Jianglin Zhao 已出版文章查询
本平台内已出版文章查询 , Takehiko Yamato * 已出版文章查询
本平台内已出版文章查询 , Jianxin Zhang 已出版文章查询
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A new thiacalixarene phenothiazine derivative (2) based on a thiacalixcrown with a 1,3-alternate conformation has been synthesized and characterized. In THF-water mixture, Compound 2 exhibits a strong fluorescence emission, with a large Stokes shift (λex/em = 357 nm/505 nm, Δλ = 148 nm), which helps to avoid interference in excitation and emission. For the metal ions tested, the fluorescence of Compound 2 was quenched only by Fe3+ and Cr3+ ions. Evidence for the hydrolysis reaction promoted by the metal ions is given by X-ray crystallography, mass spectra (MS), infrared (IR) spectra, and fluorescence spectroscopy data.
本平台内已出版文章查询 , Xiaoming Mao 已出版文章查询
本平台内已出版文章查询 , Xiaochao Zhang 已出版文章查询
本平台内已出版文章查询 , Yunfang Wang 已出版文章查询
本平台内已出版文章查询 , Yawen Wang 已出版文章查询
本平台内已出版文章查询 , Hui Zhang 已出版文章查询
本平台内已出版文章查询 , Xiaogang Hao 已出版文章查询
本平台内已出版文章查询 , Caimei Fan * 已出版文章查询
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In this study, silver nano-particles have been anchored in the surface of BiOBr photocatalysts by a citric acid-assisted photoreduction method. The citric acid was served as a chelating and reductive agent for the preparation of Ag-decorated BiOBr photocatalysts (named as Ag/BiOBr-2). The as-synthesized samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and UV-Vis diffuse reflection spectroscopy (DRS). The Ag/BiOBr-2 photocatalyst exhibited excellent and stable photocatalytic activities on MO and phenol degradation under simulated sunlight irradiation. The enhanced photocatalytic activity could be ascribed to the smaller size, rough surface, and the surface plasma resonance (SPR) effect of Ag. Also, the Schottky junction, between the surface of the BiOBr and silver nanoparticles, accelerated the efficient transfer and separation of photoinduced electron-hole pairs and promoted the photocatalytic performance. The active species tests indicated that the superoxide radical (·O2-) was responsible for the enhanced photocatalytic performance of Ag/BiOBr-2. Finally, a possible photocatalytic mechanism was proposed.
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The hydrogen-bond interactions in ionic liquids have been simply described by the conventional hydrogen-bond model of A-H…B. Coupling with the strong electrostatic force, however, hydrogen bond between the cation and anion shows particular features in the geometric, energetic, electronic, and dynamic aspects, which is inherently different from that of the conventional hydrogen bond. A general model could be expressed as +[A-H…B]-, in which A and B represent heavy atoms and "+" and "-" represent the charges of the cation containing A atom and anion containing B atom, respectively. Because the structure shows a "zig-zag" motif, this coupling interaction is defined here as the Z-bond. The new model could be generally used to describe the interactions in ionic liquids, as well as bio-systems involved in ions, ionic reaction, and ionic materials.
本平台内已出版文章查询 , Yancheng Liu 已出版文章查询
本平台内已出版文章查询 , Haixia Li 已出版文章查询
本平台内已出版文章查询 , Peng Zhang 已出版文章查询
本平台内已出版文章查询 , Jianfeng Zhao 已出版文章查询
本平台内已出版文章查询 , Wenfeng Wang * 已出版文章查询
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Laser flash photolysis and sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) experiments were carried out to study the photosensitive damage induced by pazufloxacin (PAX) and the protection of lysozyme (Lyso) by ferulic acid (FCA), an active antioxidant. Transient absorption spectra revealed electron transfer from Lyso and FCA to 3PAX*, with respective bimolecular reaction rate constants of 6.3×107 and 1.4×1010 dm3/(mol s). A pulse radiolysis study was also performed to investigate the formation of Lyso radical cations. Results showed that FCA effectively inhibited the cross-linking of protein induced by fluoroquinolones. Finally, a mechanism of the protective effect of FCA on Lyso was proposed.
Surface of room temperature ionic liquid [bmim][PF6] studied by polarization- and experimental configuration-dependentsum frequency generation vibrational spectroscopy
本平台内已出版文章查询 , Youqi Guo 已出版文章查询
本平台内已出版文章查询 , Xia Li 已出版文章查询
本平台内已出版文章查询 , Zhen Zhang 已出版文章查询
本平台内已出版文章查询 , Shilin Liu 已出版文章查询
本平台内已出版文章查询 , Zhou Lu * 已出版文章查询
本平台内已出版文章查询 , Yuan Guo * 已出版文章查询
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Understanding and control of the surface properties such as molecular orientations are of great importance in numerous appli- cations of ionic liquids. However, there remain discrepancies among the previous experimental and theoretical studies on the surface orientation and structures of room temperature ionic liquids (RTIL) systems. In this article, the orientation of 1-butyl-3-methylimidazolium ([bmin]) cation at the air/liquid interface of a characteristic RTIL, 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim][PF6]), was investigated by the sum frequency generation vibrational spectroscopy (SFG-VS). Detailed polarization and experimental configuration analyses of the SFG-VS spectra showed the possibility of a small spectral splitting in the CH3 symmetric stretching region, which can be further attributed to the probable existence of multiple orientations for the interfacial [bmim] cations. In addition, the (N)-CH3 vibrations were absent, ruling out the prediction by several recent molecular dynamics simulations which state that portions of the [bmim] cations orient with a standing-up (N)-CH3 group at the ionic liquid surface. Hence, new realistic theoretical models have to be developed to reflect the complex nature of the ionic liquid surface.
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Three different nanorod-like gallium oxides with mono/poly-crystalline nature (α, β, and α/β-Ga2O3) were prepared by regulating the amount of polyethylene glycol (PEG) 6000 in the range of 0.2-0.8 g proportionally via a hydrothermal method combined with further calcination. The bandgap of the products, given by UV-Vis diffuse reflectance spectra (UV-Vis DRS), was in the order of α-Ga2O3 > α/β-Ga2O3 > β-Ga2O3. To further investigate the photocatalysis performance of the catalysts, the decomposition of rhodamine B (RhB) by Ga2O3 under UV light illumination (λ < 387 nm) was presented and complete degradation could be achieved within 30 min, a result that showed the highest efficiency. The photocatalytic oxidation mechanism is further discussed and prominently related to the active species: hydroxyl radical (·OH) and superoxide radical (O2·-), which were confirmed by electron paramagnetic resonance (EPR).
本平台内已出版文章查询 , Hanbao Chong 已出版文章查询
本平台内已出版文章查询 , Jia Tang 已出版文章查询
本平台内已出版文章查询 , Li Feng 已出版文章查询
本平台内已出版文章查询 , Bin Zhou 已出版文章查询
本平台内已出版文章查询 , Fangyu Fu 已出版文章查询
本平台内已出版文章查询 , Xin Wang 已出版文章查询
本平台内已出版文章查询 , Peng Li * 已出版文章查询
本平台内已出版文章查询 , Manzhou Zhu 已出版文章查询
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A simple and efficient method for the synthesis of ultrasmall Pd nanoclusters (NCs) has been developed. The as-obtained Pd NCs displayed uniform size with an average diameter of 1.8±0.2 nm. The ultrasmall Pd NCs and carbon nanotubes (CNTs)-supported Pd NCs also showed outstanding catalytic activity for nitrobenzene reduction and Suzuki coupling reactions. Notably, the reactions were conducted under mild conditions with high yield and selectivity.
The first enantioselective total synthesis of (+)-preussin B and an improved synthesis of (+)-preussin by step-economical methods
本平台内已出版文章查询 , Hui Geng 已出版文章查询
本平台内已出版文章查询 , Yong-Song Tian 已出版文章查询
本平台内已出版文章查询 , Qiu-Ran Peng 已出版文章查询
本平台内已出版文章查询 , Kai-Jiong Xiao 已出版文章查询
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The first enantioselective total synthesis of (+)-preussin B and an improved synthesis of the antifungal alkaloid (+)-preussin are described. Our approach relied on the four step-economical synthetic methods developed in our laboratory: (1) the cis-diastereoselective reductive dehydroxylation of hemiaminals; (2) the direct amide/lactam reductive alkylation; (3) the one-pot N,O-bisdebenzylation-N-methylation; and (4) the one-step synthesis of malimide from malic acid. Both total syntheses are quite concise, which have been achieved in six steps, and gave overall yields of 25.7% and 27.6%, respectively.
Highly active porous nickel-film electrode via polystyrene microsphere template-assisted composite electrodeposition for hydrogen-evolution reaction in alkaline medium
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A highly porous nickel-film electrode with satisfactory mechanical strength was prepared by a facile vertical template-assisted composite electrodeposition method using polystyrene (PS) microspheres templates, with the aim of improving the electrocatalytic activity for the hydrogen-evolution reaction (HER). During the composite electrodeposition process, the hydrophobic PS microspheres were highly dispersed in the electrolyte with the help of a surfactant, and then co-deposited with Ni to form the film electrode. After removing the PS templates by annealing, a porous Ni film containing large amount of uniformly dispersed pores with narrow size distribution was obtained, and then applied as the electrode for the HER in an alkaline medium. As evidenced by the electrochemical analysis, the porous Ni film electrode exhibits higher catalytic activity as compared to a dense Ni film electrode and is superior to a Ni/RuO2/CeO2 commercial electrode. The effect of temperature on the catalytic properties of the porous Ni film electrode was also investigated; the activation energy was calculated as 17.26 kJ/mol. The enhanced activity toward the HER was attributed to the improved electrochemical surface area and mass transportation facilitated by the high porosity of the synthesized Ni film electrode.
A highly sensitive chemiluminescence sensor for detecting mercury (II) ions: a combination of Exonuclease III-aided signal amplification and graphene oxide-assisted background reduction
本平台内已出版文章查询 , Yue Wang 已出版文章查询
本平台内已出版文章查询 , Yan Xu 已出版文章查询
本平台内已出版文章查询 , Yang Liu 已出版文章查询
本平台内已出版文章查询 , Di Li * 已出版文章查询
本平台内已出版文章查询 , Chunhai Fan * 已出版文章查询
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In this paper, we report a highly sensitive chemiluminescence (CL) sensor for Hg2+ ions based on thymine-Hg2+-thymine (T-Hg2+-T) coordination chemistry. We designed a thymine rich oligonucleotide as a capture probe and a signal probe that includes two functional domains: a horseradish peroxidase-mimicking DNAzyme domain for the generation of CL, and a recognition domain. Graphene oxide (GO) was introduced to adsorb the signal probe via p-p interaction, which brought the DNAzyme domain and GO into close proximity and quenches CL. In the presence of Hg2+ ions, the coordination of Hg2+ with the capture probe yielded a hairpin complex, triggers cascaded strand displacement reactions and Exonuclease III-assisted signal amplifications. As a result, accumulated amounts of DNAzyme were generated and released from GO, leading to an enhanced CL signal. This strategy combines enzyme-based signal amplification and GO as a background reducer, leads to a limit of detection (LOD) of 2 nmol/L. This simple detection system provides a label-free yet sensitive approach for detection of Hg2+ ions.
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Alzheimer's disease (AD) is one of the most common types of dementia whose hallmarks include neurofibrillary tangles and senile plaques. The latter are mainly composed of amyloid-β proteins (Aβ), and it's suggested that Aβ may be the causative factor in AD pathogenesis. Immunotherapy targeting Aβ for preventing aggregation of Aβ and mildly clearing amyloid plaques has been a hot topic since 1999. Although the first clinical trial of Aβ vaccine, AN-1792, failed in phase II, its results suggested some key points in the design of Aβ vaccines. Avoiding the possible toxic Aβ specific T cell response and inducing a Th2 type cellular immune response may be beneficial for Aβ immunotherapy. Many associations and research groups are working on Aβ vaccine and some progress has been made in recent years. In this review, we have provided a detailed summary of past Aβ vaccines, which have been sorted by the immunogen, and we also discuss some recent progress and future perspectives.
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Sulfur (S)-doped graphene sheets were prepared by a facile electrochemical method, which effectively combined exfoliation of graphite and in situ S doping of graphene together. The metal-free S-doped graphene sheets exhibit high electrocatalytic activity, long-term stability, and excellent tolerance to cross-over effects of methanol in alkaline media for the oxygen reduction reaction (ORR), indicating that these S-doped graphene sheets possess great potential for a substitute for Pt-based catalysts in fuel cells.
Fabrication of ZnO with tunable morphology through a facile treatment of Zn-based coordination polymers
本平台内已出版文章查询 , Jiao Zhao 已出版文章查询
本平台内已出版文章查询 , Feng Rong 已出版文章查询
本平台内已出版文章查询 , Can Li * 已出版文章查询
本平台内已出版文章查询 , Qihua Yang * 已出版文章查询
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The morphology and structure of zinc oxide (ZnO), one of the important semiconductors, are relevant to its properties and applications. The preparation of ZnO with tunable morphology and desired structure is an attractive topic in the field of material synthesis. This work reports a facile method for the synthesis of ZnO with controllable morphology and crystal orientation using Zn-based coordination polymer particles (Zn-CPP) as precursors. Using hydrothermal method, Zn-CPP with morphologies of microrod, nanoplate, flower-like, arrow-tipped microsheet, and square cylinder were successfully synthesized via the coordination between metal ions Zn2+ and organic ligand 1,4,5,8-naphthalenetetracarboxylic dianhydride in aqueous solution. Subsequent thermal treatment of the Zn-CPP successfully resulted in the formation of porous ZnO with similar morphology to Zn-CPP. It is also found that the ZnO with enhanced (002) orientation could be obtained from Zn-CPP with preferred (002) orientation. This strategy could be extended for the preparation of other metal oxides with desired shape and structure.
Novel benzimidazole derived naphthalimide triazoles: synthesis, antimicrobial activity and interactions with calf thymus DNA
本平台内已出版文章查询 , Kishore Baathulaa 已出版文章查询
本平台内已出版文章查询 , Vijaya Kumar Kannekanti 已出版文章查询
Vijaya Kumar Kannekanti
本平台内已出版文章查询 , Cheng-He Zhou * 已出版文章查询
本平台内已出版文章查询 , Gui-Xin Cai * 已出版文章查询
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A novel series of benzimidazole derived naphthalimide triazoles and some corresponding triazoliums have been successfully synthesized and characterized by 1H NMR, 13C NMR, 1H-1H COSY, IR and HRMS spectra. All the new compounds were screened for their antimicrobial activities in vitro by two-fold serial dilution. 2-Chlorobenzyl triazolium 8g and compound 9b with octyl group exhibited the best antibacterial activities among all the tested compounds, especially against S. aureus with inhibitory concentration of 2 μg/mL which was equipotent potency to Norfloxacin (MIC=2 μg/mL) and more active than Chloromycin (MIC=7 μg/mL). Triazoliums 8g and 8f bearing 3-fluorobenzyl moiety displayed the best antifungal activities (MIC=2-19 μg/mL) against all the tested fungal strains without being toxic to PC12 cell line within concentration of 128 μg/mL. Further investigations by fluorescence and UV-Vis spectroscopic methods revealed that the compound 8g could effectively intercalate into calf thymus DNA to form the 8g-DNA complex which could block DNA replication, exerting powerful antimicrobial activities.
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It is known that the energy of the amorphous state of itraconazole loaded in ordered mesoporous materials is high relative to that of the crystalline state and is responsible for enhanced solubility and dissolution rate. We investigated the effects of particle size (0.7-5 mm), mesostructure (2D p6mm, cubic Ia-3d and cubic Fm-3m) and pore size (2.2-15.4 nm) of mesoporous silicas on the release performance of itraconazole. Results indicated that the release performance was not influenced by the particle sizes tested here, that the release performance increased with increasing pore diameter due to the lower probability of drug molecules colliding to recrystallize in large pores, and that the release performance was decreased in the cage-type pore structure (Fm-3m) compared to that in the cylindrical pore structures (p6mm and Ia-3d) because of the small entrance to the cagelike pores that retards the drug release.
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Ultrasensitive label-free electrochemiluminescence immunosensor based on N-(4-aminobutyl)-N-ethylisoluminol-functionalized graphene composite
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The electrochemiluminescence (ECL) behavior of N-(4-aminobutyl)-N-ethylisoluminol (ABEI)-functionalized graphene composite (ABEI-GC) modified on an indium tin oxide (ITO) electrode was studied. ABEI-GC exhibited excellent ECL activity. On this basis, a label-free ECL immunosensor was developed for the sensitive detection of human immunoglobulin G (hIgG) by using ABEI-GC as the ECL nano-interface via a layer-by-layer assembly technique. ABEI-GC was first assembled onto an ITO electrode. Positively charged chitosan was then electrostatically adsorbed to the modified electrode. Finally, negatively charged antibody-coated gold nanoparticles were attached to the surface to form the ECL immunosensor. In the presence of hIgG, hIgG was captured by its antibody. In addition, an ECL signal was detected in the presence of H2O2 when a double potential was applied. The ECL immunosensor for the determination of hIgG showed a linear range of 1.0×10-13-1.0×10-8 g/mL with a detection limit of 5.0×10-14 g/mL. This immunosensor has high sensitivity, wide linearity and good reproducibility. The superior sensitivity of the proposed ECL immunoassay mainly derives from the incorporation of ABEI-GC, which not only improves the ECL intensity, response speed, and stability, but also provides a large specific surface for high levels of protein loading. This work reveals that ABEI-GC is good nano-interface for the construction of ECL biosensors. Our strategy is promising for protein detection and may open up a new avenue for ultrasensitive label-free immunoassays.
本平台内已出版文章查询 , Yi Zeng * 已出版文章查询
本平台内已出版文章查询 , Xiaohui Zhang 已出版文章查询
本平台内已出版文章查询 , Tianjun Yu 已出版文章查询
本平台内已出版文章查询 , Jinping Chen 已出版文章查询
本平台内已出版文章查询 , Yi Li * 已出版文章查询
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Dendrimers are well-defined tree-like macromolecules possessing numerous chain ends emanating from a single core, which makes them attractive candidates for mimicking light-harvesting systems and hydrogenases. Photoinduced electron and energy transfers are main processes involved in light-harvesting and photocatalysis. In this review, the general concepts of design strategies and recent developments of photofunctional dendrimers in biomimics of light-harvesting systems and hydrogenases are discussed. The energy transfer and electron transfer processes in light-harvesting dendrimers and the effect of dendritic structures in photochemical hydrogen production are illustrated.
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本平台内已出版文章查询 , Chuan Fu 已出版文章查询
本平台内已出版文章查询 , Xiang Gao 已出版文章查询
本平台内已出版文章查询 , Yan Liu 已出版文章查询
本平台内已出版文章查询 , Pengxiang Xu 已出版文章查询
本平台内已出版文章查询 , Liu Liu 已出版文章查询
本平台内已出版文章查询 , Ye Lv 已出版文章查询
本平台内已出版文章查询 , Songsen Fu 已出版文章查询
本平台内已出版文章查询 , Ying Sun 已出版文章查询
本平台内已出版文章查询 , Daxiong Han 已出版文章查询
本平台内已出版文章查询 , Yan-Mei Li 已出版文章查询
本平台内已出版文章查询 , Yufen Zhao * 已出版文章查询
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Post-translational modification of proteins by N-phosphorylation of the basic amino acid residues plays important roles in biological processes. The high-energy P-N bond might have contributed to the evolution of prebiotic chemistry. N-phosphoryl amino acids (PAAs) can serve as interesting small molecular models for the study of P-N bonds in prebiotic chemical evolution. PAAs are capable of simultaneously producing several important biomolecules such as polypeptides and oligonucleotides under mild reaction conditions. In this review, we describe the chemistry of PAAs, discusse their likely prebiotic origins and their reactivity and how they relate to biological P-N bond species. We also depict a possible prebiotic scenario mediated by PAAs in which PAAs may have acted as one of the essential forces driving prebiotic biomolecules to the first protocell.
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Ratiometric mode with dyads: a breakthrough in dynamic trapping and quantification for redox regulation in living cells
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A series of novel Zn(II) and Mn(II) metal-organic frameworks constructed by 2,4-bis-oxyacetate-benzoic acid: syntheses, structures and photoluminescence
本平台内已出版文章查询 , Pei Shi 已出版文章查询
本平台内已出版文章查询 , Wei Shen 已出版文章查询
本平台内已出版文章查询 , Xiaoju Chen 已出版文章查询
本平台内已出版文章查询 , Guoliang Zhao * 已出版文章查询
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A new carboxylic acid ligand, 2,4-bis-oxyacetate-benzoic acid (H3BOABA), was designed and introduced to construct novel metal-organic framework materials. [ZnNa(BOABA)(phen)(H2O)]·H2O (1), ZnNa(BOABA) (2), Mn3(BOABA)2(phen)2 (3), [Mn2(BOABA)(OH)]·(H2O)2 (4) (CCDC: 885138, 885137, 894225, 883094) were hydrothermally synthesized and characterized by elemental analysis, IR spectra and thermal gravimetric analyses. Crystal structures of the complexes were determined by single crystal X-ray diffraction method. Complex 1 is a one dimensional double edges non-interpenetrated framework decorated by the phen ligands on the surface. Complex 2 is an unique three dimensional open framework, consisting of Zn(II) and Na(I). Complex 3 is an unique double edges one dimensional MOF containing a [Mn3(BOABA)2(phen)2]n non-interpenetrated structure. Complex 4 is a two dimensional plane structure containing two Mn atoms in the same coordination environment. The interaction between four complexes and DNA were studied by EtBr fluorescence probe. Meanwhile, photoluminescence studies revealed that these four complexes display strong fluorescent emission bands in the solid state at room temperature.
Fabrication and characterization of BaCe0.8Y0.2O2.9-Ce0.85Sm0.15O1.925 composite electrolytes for IT-SOFCs
本平台内已出版文章查询 , Ning Tian * 已出版文章查询
本平台内已出版文章查询 , Yufu Deng 已出版文章查询
本平台内已出版文章查询 , Guannan Li 已出版文章查询
本平台内已出版文章查询 , Ling Liu 已出版文章查询
本平台内已出版文章查询 , Liying Cheng 已出版文章查询
本平台内已出版文章查询 , Peng Gao 已出版文章查询
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The BaCe0.8Y0.2O2.9-Ce0.85Sm0.15O1.925 composite electrolytes were prepared with BaCe0.8Y0.2O2.9 (BCY) and Ce0.85Sm0.15O1.925 (SDC). The SDC and BCY powders were mixed in the weight ratio of 95:5, 85:15, and 75:25, respectively (named as BS95, BS85, and BS75). Because of the composite effect between the SDC and BCY phases, the BS95 and BS85 exhibit improved conductivity compared with the pure SDC and BCY. The conductivity of BS95 is higher than that of BS85, indicating that the composite effect of BS95 is greater than that of BS85. Nevertheless, the composite effect in BS75 does not exist. Hence, we conclude that the composite effect in the BCY-SDC composites will decrease with the increase of the amount of BCY and even disappear when the amount of BCY exceeds a certain value. In our case, the optimum composition of the composite electrolyte is 95 wt% SDC and 5 wt% BCY. The BS95 has the highest conductivity (st=0.07808 S cm-1, at 800 ℃) and the fuel cell based on the BS95 shows the best performance (the maximum power density reaches as high as 526 mw cm-2 at 750 ℃). The encouraging results suggest that the BCY-SDC composites are the very promising electrolyte materials for IT-SOFCs.
本平台内已出版文章查询 , Hongfei Zhang 已出版文章查询
本平台内已出版文章查询 , Kaiguang Yang 已出版文章查询
本平台内已出版文章查询 , Junfeng Ma 已出版文章查询
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Fast and efficient sample preparation methods are a prerequisite for protein identification in bottom-up proteomics. Here, an innovative microwave irradiation sample preparation method was developed based on an optimized organic-aqueous solvent system for protein identification. Specifically, protein solutions containing high-concentration acetonitrile were subjected to 5 min microwave irradiation. After cooling down, trypsin was added and the digestion was performed with 30 s microwave irradiation, and the resulting peptides were analyzed by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS). A shortened processing time of only 5.5 min is needed with this method (more than 12 h is necessary in the traditional overnight protein sample preparation). Moreover, due to the absence of urea and other chaotropic reagents, the digests can be readily identified by MALDI-TOF MS. When an assessment of this method was performed by digesting a model protein BSA, 69% ± 3% sequence coverage corresponding to 47 ± 3 peptides was obtained, which shows better protein identification than that from the standard overnight protein sample preparation method (51% ± 2% sequence coverage and 23 ± 1 peptides). Another model protein a-casein was used for the analysis of protein phosphorylation with the newly developed method that yielded 4 phosphopeptides with 8 phosphorylation sites, whereas 3 phosphopeptides with 2 phosphorylation sites were obtained from the traditional overnight approach. Moreover, the organic-aqueous microwave irradiation method provides effective digestion for proteins down to fmol.