JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Jianwei Liu,Jianan Wang,Lei Zhu,Xin Chen,Qianyue Ma,Zhicheng Xu,Shiyi Sun,Ning Wang,Qinqin Chai,Wei Yan
Lithium-sulfur (Li-S) batteries are considered to be promising candidates for next-generation storage systems. However, the practical applications are still hindered by the severe capacity decay, mainly caused by the large volume change, polysulfide shuttle and sluggish sulfur conversion kinetics. Herein, hollow urchin-like Mn 3 O 4 (HU-Mn 3 O 4 ) microspheres as sulfur hosts have been synthesized by the hydrothermal method and calcination treatment, aiming to prevent the polysulfide dissolution (benefiting from the strong polysulfide anchoring effect of Mn 3 O 4 ) and alleviate the volume expansion of sulfur (benefiting from the special hollow structure). Meanwhile, the urchin-like thorny surface also facilitates the rapid ion/electron transfer and the abundant active sites for the fast sulfur redox kinetics. When used as the sulfur host in Li-S batteries, the S@HU-Mn 3 O 4 cathode delivers a high initial capacity of 1137.4 mAh g −1 with a slow capacity decay of 0.042% after 200 cycles at 0.2 C. Even under the conditions of lean electrolyte (E/S = 7 mL g −1 ) and low N/P ratio (N/P = 2.1), the S@HU-Mn 3 O 4 cathode still enables a stable cycling performance with a high gravimetric energy density (202 Wh kg cell −1 ), demonstrating its great potential in the development of future practical Li-S battery materials.
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JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
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2021
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IF 3.205
Yuan Zhou,Mengying Wei,Meiling Fan,Zhongying Liu,Aimin Wang,Yuanyuan Liu,Lihui Men,Zifeng Pi,Zhiqiang Liu,Fengrui Song
Lignans from Schisandra chinensis (Turcz.) Baill (LFS) has been proved to improve impaired cognitive ability thereby show potential in treating Alzheimer’s disease (AD). In this study, UHPLC-Q-TOF-MS and UHPLC-QQQ-MS were adopted cooperatively to establish a method synchronously detecting 10 kinds of LFS monomers in rat plasma samples. And this method was further applied for pharmacokinetic study to compare the metabolism of LFS in normal and AD rats. The results indicated that AD rats showed an observably better absorption of LFS compared to normal rats. Based on time-varying plasma concentration of LFS, metabolomics was used to establish a plasma concentration–time-endogenous metabolite connection. In total 54 time-varying endogenous metabolites were screened and most of which were closely associated with AD. And LFS exerted a concentration dependent regulating effect to most of these metabolites. Through biomarker related pathways and biological function analysis, LFS might treat AD through neuroprotection, antioxidant damage and regulating the metabolism of unsaturated fatty acids. This is the first study connecting LFS absorbtion and endogenous metabolite changes with the time lapse. The pharmacokinetics and metabolic profile differences between normal and AD rats were firstly investigated as well. This study provides a novel perspective in exploring the effect and mechanism of LFS in treating AD.
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JOURNAL OF HAZARDOUS MATERIALS
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2021
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IF 10.588
Yibo Yuan,Xipeng Wei,Hua Yin,Minghan Zhu,Haoyu Luo,Zhi Dang
The effects of organic acids on hexavalent chromium (Cr(VI)) removal by reduced iron-based materials have been extensively studied. Nevertheless, the promotion mechanism from the perspective of the electron transfer process is still unclear. Herein, sulfidated nanoscale zero-valent iron (S-nZVI) and the selected organic acids, citric acid (containing both -OH and −COOH groups) and oxalic acid (containing only −COOH groups), showed significant synergistic promotion effects in Cr(VI) removal. The FeS and FeS 2 on S-nZVI surface could enhance the Cr(VI) reduction as the reductive entity and electron conductor. Furthermore, even though the reactivity of FeS with Cr(VI) is higher than that with FeS 2 , the Cr(VI) removal efficiency by FeS 2 was much higher than that by FeS with organic acids. Under neutral and alkaline conditions (pH 6.0–8.0), organic acids promoted the diffusion, adsorption and complexation of Cr(VI) on S-nZVI surface, thus enhancing the electron selectivity towards Cr(VI). However, when the solution pH changed to acidic conditions (pH 4.0), organic acids facilitated the dissolution of Fe(II) ions from S-nZVI and enhanced the electron utilization towards Cr(VI) via the fast Fe(III) reduction process. This study provided a new insight into the Cr(VI) removal, which was beneficial to understand the application boundaries of S-nZVI for Cr(VI) remediation.
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Journal of Materials Chemistry C
·
2019
·Vol. 8
·期 1
·303-309
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IF 6.641
Shuai Yang,Yang He,Yanju Liu,Jinsong Leng
In this paper, a series of shape-memory poly(arylene ether ketone)s (PAKEs) with various flexible groups (i.e., carbolic bonds, ether, and ketone linkages) and entangled crystalline polymeric structures were synthesized by combining different bisphenol monomer (bisphenol A monomer and methyl hydroquinone monomer) proportions with a 4,4′-difluorobenzophenone monomer. The flexible parts and the entangled parts acted as a reversible phase and permanent phase, respectively. The prepared PAEK films exhibited excellent heat-triggered shape-memory behaviors with tunable glass transition temperatures (Tg) from 116 °C to 140.5 °C including an extremely high fixity ratio (over 98%), high recovery ratio (over 92%), and fast recovery rate (within 7.0 s). As increasing the content of the methyl hydroquinone monomer in the structural unit, the recovery ratio showed a downward trend, whereas the recovery time increased gradually. In addition, the electric-triggered shape-memory effect of the PAEK films was achieved via the introduction of carbon nanotubes (CNTs). Upon applying a voltage of 25 V, the recovery ratios of the composite films containing 10 wt% and 15 wt% CNTs were all over 80% (of 83.0% and 87.6%, respectively), indicating a great electric-triggered shape-memory behavior. The recovery ratio increased and the triggered voltage decreased as increasing the content of CNTs. The heat and electric dual-triggered shape-memory PAEK composites could be important smart materials possessing wide application prospects.
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INORGANIC CHEMISTRY
·
2019
·
IF 4.85
Mengping He,Dongxing Kou,Wenhui Zhou,Zhengji Zhou,Yuena Meng,Sixin Wu
The earth-abundant Cu2ZnSnS4 (CZTS) quantum dots (QDs) have emerged as one potential substitute to toxic cadmium or rare indium QDs, but their application in quantum dot-sensitized solar cells (QDSSCs) is still limited by the improper particle size and the rigorous synthesis and ligand exchange conditions. Herein, we developed a one-pot hot injection method by using Tri-n-octylphosphine oxide (TOPO) as the solvent and oleylamine as the capping agent to synthesize Cu2ZnSn(S,Se)4 (CZTSSe) QDs with adjustable size and narrow size distribution. The key feature of this approach is that we can take advantage of the high-temperature nucleation, low-temperature growth, and strong reducibility of NaHB4 to prepare small-sized CZTSSe QDs without using 1-dodecanethiol (DDT) and to extend the light harvesting range through Se incorporation. After Se incorporation, it turns out that the conduction band (CB) level of CZTSSe QDs decreases, implying that the injection driving force of the electron to the CB of TiO2 films becomes weaker and a larger recombination would be induced at the TiO2/QDs/electrolyte interface. Benefiting from the broadened optoelectronic response range, the induced higher Jsc (16.80 vs 14.13 mA/cm2) finally leads to the increase of the conversion efficiency of CZTSSe QDSSC from 3.17% to 3.54% without further modification. Despite the fact that the efficiency is still far behind those of literature reported values through use of other chalcogenide sensitizers, this DDT-free approach solves the main hindrance for the application of CZTSSe QDs in QDSSCs and holds a more convenient way for ligand exchange, light absorption improvement, and particle size control.
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PROCESS BIOCHEMISTRY
·
2019
·
IF 2.883
Zhe-Ming Wu,Chang-Ling Hao,Tao Tong,Ren-Chao Zheng,Yu-Guo Zheng
( S )-3-Cyano-5-methylhexanoic acid (( S )-CMHA) is the key chiral intermediate of pregabalin . In this paper, an aqueous two-phase system (ATPS) was developed to extract ( S )-CMHA from nitrilase-catalyzed bioconversion broth. Inorganic salts and hydrophilic solvents were screened to form ATPS, among which an acetone/ammonium sulfate ATPS was investigated in detail, including phase diagram, effect of phase composition and stability of ( S )-CMHA. The maximum product recovery of 99.15% was obtained by an optimized ATPS system composed of 15% (w/w) ammonium sulfate and 35% (w/w) acetone with the removal of 99% cells and 86.27% proteins. The total ( S )-CMHA yield reached 92.11% after back-extraction. The recycling use of ammonium sulfate was investigated, and 93.10% of salt in the salt-rich phase was recovered with the addition of methanol. The results demonstrated the efficiency of the two-step extraction process for separation of ( S )-CMHA.
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SENSORS AND ACTUATORS B-CHEMICAL
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2019
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IF 6.393
Cheng Li,Yu Chen,Lijun Yang,Congrou Zhang,Bin Wang,Yong Wang
“Turn-on” fluorescent materials in the absence of metal and organic solvent are highly desirable as bioprobes to selectively and sensitively detect pyrophosphate (PPi) anion. In this work, we embedded tetraphenylethene (TPE) inside the relatively rigid hyperbranched poly(amido amine) (HPA) to afford highly water soluble TPE-HPA materials, where the TPE fluorescence was pre-quenched in water by the hyperbranched structure of HPA without participation of any metal or organic solvents. The obtained TPE-HPA could be directly used as fluorescence “turn-on” bioprobe under physiological conditions to selectively detect PPi. There was a good linearity between the photoluminescence enhancement and the PPi concentration in the range of 0–1.0 μM with a limit of detection (LOD) of 6.5 nM. Compared with the other reported AIE probes for PPi detection, TPE-HPA with the optimal TPE content showed the best comprehensive performance, that is metal-free, organic-solvent free and nanomolar level LOD. The extreme selectivity and sensitivity towards PPi allowed TPE-HPA to accurately detect the PPi concentration in human urine.
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CATALYSIS LETTERS
·
2019
·Vol. 149
·期 7
·1800-1812
·
IF 2.372
Yang Yalin,Liu Yanhong,Mao Baodong,Luo Bifu,Zhang Kewei,Wei Wei,Kang Zhenhui,Shi Weidong,Yuan Shouqi
I–III–VI quantum dots (QDs) play an important role in visible-light-driven photocatalysis due to their unique optical properties and widely tunable bandgap. However, these materials suffer from rich defect states and high charge carrier recombination. In this work, a facile mixed-ligand method was developed for the manipulation of the optical and photocatalytic properties of multinary Ag–In–Zn–S QDs by introducing 3-mecaptopropionic acid (MPA) into the l -cysteine (Cys) capped QDs system during synthesis. The effect and mechanism of MPA addition was systematically investigated. With the increase of MPA/Cys, the photoluminescence (PL) quantum yield (QY) of the QDs shows an obvious increase at the first stage (MPA/Cys < 5:5), whereas the particle size and UV–Vis absorption remain almost unchanged. Photocatalytic properties of QDs shows similar trend as PL QY with the increase of MPA/Cys, where the hydrogen production rate was doubled with MPA/Cys = 5:5. With ascorbic acid (AA) as the sacrificial reagent, the MPA/Cys capped QDs gave a hydrogen production rate as high as 6.64 mmol g −1 h −1 , which is comparable to the state-of-the-art results but without any cocatalyst, indicating the fascination of the simple mixed-ligand method. Further mechanism study indicates that the introduced MPA resulted in dramatic increase of the PL lifetime and the reduction of nonradiative decay, which can be ascribed to the strong passivation effect of MPA. The MPA/Cys capped QDs also show compressed charge recombination as indicated in electrochemical impedance spectra, slightly more negative ζ-potential and reduced hydrated particle radius, which may also contribute to the improved charge transfer for photocatalysis. Our method provides a super simple strategy for the defect manipulation of the Ag–In–Zn–S QDs without the sacrifice of charge transfer, which could be a useful guideline for efficient QDs-based visible-active photocatalysts. Graphical Abstract Mixed-ligand-modified Ag–In–Zn–S quantum dots with improved hydrogen production were prepared.
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POLYMER
·
2019
·
IF 3.771
Zhengfang Zhu,Peng Cui,Yu Lu,Jianrong Wu,Jing Zeng,Weiye Ma,Xinsheng Zhao,Yuanqin Zhu
To develop a facile route towards anion conductive polymers containing multi-cation side chains, novel anion conductive poly (2,6-dimethylphenylene oxide)s (DQPPO-x-I) was prepared from a clickable di-quaternized side-chain precursor, via Cu(I)-catalyzed azide-alkyne click chemistry. The new precursor was synthesized from commercially available 2-{[2-(dimethylamino)ethyl]methylamino}ethanol and 3-bromopropyne via nucleophilic substitution and Menshutkin reaction . The chemical structures of the precursor and DQPPO-x-I polymers were characterized by 1 H NMR and FT-IR. Small angle X-ray scattering and transmission electron microscopy revealed that the obvious micro-phase separation was formed in the DQPPO-x-I membranes. The optimized DQPPO-19-OH membrane with ion exchange capacity of 2.13 meq./g exhibited the highest hydroxide conductivity of 31.6 mS/cm at 80 °C, tensile strength of 64 MPa, and thermal stability (onset decomposition temperature up to 187 °C).
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Polymer Chemistry
·
2019
·Vol. 10
·期 21
·2697-2705
·
IF 4.76
Haixia Li,Wentao Tang,Yifu Huang,Wenhong Ruan,Mingqiu Zhang
Lithium–sulfur (Li–S) batteries have attracted tremendous attention as the next generation of lithium batteries. In the battery construction, a nanopore separator can improve the performance of the Li–S battery by working as a nanofiltration film, inhibiting the migration of soluble polysulfide ions between the electrodes. Herein, a new strategy to synthesize a nanopore separator of poly(propylene glycol)-co-pentaerythritol triacrylate (PPG-co-PETA) particles to suppress polysulfide shuttling has been proposed. The PPG-co-PETA cross-linked particles were easily obtained by a facile approach of UV-induced monomer polymerization while implementing molecular cross-linking for nanopore control. The characteristic nanopore size of the PPG-co-PETA separator ranged from ∼1.24 nm to ∼1.86 nm upon changing the type of photo-initiator and content of cross-linking agent. The results showed that the optimized separator for a Li–S battery could possess an electrolyte uptake of 350% with excellent thermal, mechanical and electrochemical properties. Notably, the Li–S battery using such a new type of nanopore separator exhibits superior retention discharge capacity (>200 cycles). It is believed that the nanopore separator of cross-linked PPG-co-PETA is a potential alternative to the commercial Celgard separator for effectively blocking polysulfide shuttling in Li–S batteries.
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Metallomics
·
2019
·Vol. 12
·期 2
·173-182
·
IF 3.571
Lv Xiaoguang,Zheng Qiaoqiao,Li Ming,Huang Zhiwei,Peng Min,Sun Jing,Shi Ping
Clioquinol is recently considered to be the most promising drug for treating cancer and neurodegenerative diseases. However, its mode of action varies from different disease models. In this study, we found that clioquinol inhibited cell growth in human neurotypic SHSY-5Y cells, which was attributed to both S-phase cell-cycle arrest and autophagic cell death. Clioquinol increased the intracellular contents of iron and zinc as well as calcium as measured by ICP-AES. Staining of Fluo-3 confirmed an increase in the level of calcium. Analysis of the metal-binding ability of clioquinol showed that it was not a chelating agent of calcium ions and the elevation of intracellular calcium content is not achieved by clioquinol as an ionophore. CaCl2 could simulate or even aggravate the cytotoxicity of clioquinol and it increased S-phase cell cycle arrest induced by clioquinol in a concentration dependent manner. Staining of acridine orange demonstrated that autophagy induced by clioquinol was not affected by addition of calcium ions. In contrast, the intracellular calcium ion chelator BAPTA-am abolished the clioquinol-induced S phase arrest and reduced the cell death caused by clioquinol. The WB assay of cell cycle-related proteins (CDK2, p21 and p27) further confirmed that S phase arrest is positively correlated with intracellular calcium elevation, which was due to the alterations of the mRNA and protein levels of calcium pumps (SERCA and SPCA). Taken together, these data indicate that clioquinol regulates the level of intracellular calcium ions to induce S-phase cell cycle arrest in human SH-SY5Y cells. Our results demonstrate for the first time that an increase of intracellular calcium content is one of the mechanisms of clioquinol in the inhibition of human neurotypic SHSY-5Y cells.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2018
·Vol. 165
·期 5
·F350
·
IF 3.662
Yunfei Yang,Yixin Xu,Niya Ye,Dengji Zhang,Jingshuai Yang,Ronghuan He
Quaternization of poly(2,6-dimethyl-1,4-phenylene oxide)s (PPOs) with a series of saturated heterocyclic compounds was carried out via the Mannich reaction to fabricate anion exchange membranes (AEMs) with high alkaline chemical stability and ion conductivity. The heterocyclic quaternary ammonium cations include 1-methylpyrrolidinium (MPy), 1-ethylpyrrolidinium (EPy), 1-butylpyrrolidinium (BPy), 1-methylpiperidinium (MPrD), 1-ethylpiperidinium (EPrD) and N-methylmorpholinium (NMM). For comparison, trimethylammonium (TMA) and 1-methylimidazolium (MeIm) functionalized PPO membranes were fabricated as well. The physicochemical properties of the prepared membranes were investigated in terms of water uptake, swelling, ion exchange capacity, mechanical properties, conductivity and tolerance to alkalies. The AEMs having saturated heterocyclic quaternary ammonium groups exhibited better resistance to nucleopholic attack of hydroxide ions than PPO-TMA and PPO-MeIm membranes, especially the PPO-MPy membrane, which retained its initial conductivity of 87.5% after immersed in 1M KOH at 80°C for 508 h.
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