查找使用阿拉丁产品的科研文献

A simple and effective method to prepare dense Li1.3Al0.3Ti1.7(PO4)3 solid–state electrolyte for lithium-oxygen batteries

Ren Yaqi,Deng Hao,Zhao Hong,Zhou Zheng,Wei Zhaohuan

A simple and effective method was developed and used to improve the conductivity and density of Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 solid–state electrolyte. The raw powders were synthesized through two different methods to expand the particle size distribution, which could improve the sintered density and the grain boundary connection of the of LATP electrolyte. Through this method, the relative density of the electrolyte made of mixed powders can reach to 97% compared with the 92% and 95% for electrolyte made of single solid-state reaction powder and sol-gel reaction powder, respectively. The conductivity test shows that this electrolyte has high total ion conductivity of 5.23 × 10 −4 S cm −1 at room temperature with the grain boundary conductivity of 6.11 × 10 −4 S cm −1 . With the merits of high density and ion conductivity, this solid-state electrolyte shows good rate capability and cycle performance in aqueous lithium-oxygen batteries.

Enhancing quantum yield of CsPb(BrxCl1-x)3 nanocrystals through lanthanum doping for efficient blue light-emitting diodes

Shuai Zhang,Hongli Liu,Xianggao Li,Shirong Wang

All-inorganic perovskite quantum dots (PQDs) have attracted great attention in optoelectronic applications . However, compared with green and red PQDs, the poor photoluminescence quantum yield (PLQY) and terrible external quantum efficiencies (EQE) of blue-emission PQDs light-emitting diodes (QLEDs) have limited their further development in display field. Here, a general strategy for enhancing PLQY and EQE through lanthanum ions doping is proposed. Density functional theory (DFT) calculations confirmed that the partial substitution of La 3+ for Pb 2+ leads to a reduced defect states and an increased radiative recombination , meanwhile, a higher carrier temperature and exciton binding energy are also obtained. In consequence, a maximum PLQY of 84.3% is obtained for La 3+ -doped CsPb(Br x Cl 1-x ) 3 PQDs with emissions ranging from 448 to 500 nm. In terms of devices, phase separation and ion migration are effectively alleviated with La 3+ profiting from the constricted lattice and stronger interaction between La and Cl. Resultantly, QLEDs with La 3+ -doped PQDs show the maximum EQE of 2.17% (480 nm) and 3.25% (489 nm), which is higher than state-of-the-art records at this wavelength.

Dielectric strength of glass fibre fabric reinforced epoxy by nano-Al2O3

Shuang Wang,Yu Chen,Jiale Mao,Cong Liu,Lei Zhang,Yonghong Cheng,Chaoyun Du,Toshikatsu Tanaka

Synthesis and evaluation of antimicrobial and anticancer activities of 3-phenyl-1-phenylsulfonyl pyrazoles containing an aminoguanidine moiety

Yushan Huang,Hongmei Hu,Rui Yan,Liwen Lin,Mingxia Song,Xiaodong Yao

A series of 3-phenyl-1-phenylsulfonyl pyrazoles containing an aminoguanidine moiety was designed, synthesized, and evaluated for their antimicrobial and anticancer activities. The majority of the target compounds showed broad-spectrum antimicrobial activity against the tested strains, with minimum inhibitory concentration (MIC) values ranging from 2 to 64 μg/ml. Compound 5k , showing the most potent antimicrobial activity against Bacillus subtilis CMCC 63501 and multidrug-resistant Staphylococcus aureus ATCC 43300 with an MIC value of 2 μg/ml, was the most promising one in this series. It was also effective for S. aureus ATCC 33591 and multidrug-resistant Escherichia coli ATCC BAA-196 at higher concentrations. The bactericidal time–kill kinetics test illustrated that compound 5k had rapid bactericidal potential. Docking results exhibited that compound 5k showed various kinds of binding to the FabH receptor, reflecting that 5k could bind with the active site well. All compounds showed excellent activity against the investigated cancer cells, with IC 50 values ranging from 1.90 to 54.53 µM. Among them, compound 5f showed prominent cytotoxicity with IC 50 = 1.90 µM against A549 cells, while exhibiting lower inhibitory activity against 293T cells (IC 50 = 41.72 µM), indicating that it has the potential for a good therapeutic index as an anticancer drug.

Preparation and characterization of poly(3-hydroxybutyrate-co-4-hydroxybutyrate)/pullulan-gelatin electrospun nanofibers with shell-core structure

Fanchen Sun,Jing Guo,Yuanfa Liu,Yue Yu

In this study, hydrophilic pullulan, which is favorable for cell adhesion, proliferation, and differentiation, was selected as a modifier for the preparation of poly(3-hydroxybutyrate-co-4-hydroxybutyrate) (P(3HB-co-4HB))/pullulan nanofibers via electrospinning to improve the biocompatibility of P(3HB-co-4HB) and increase the drug loading of composite fibers. Alkyl polyglycoside was used as the emulsifying agent to promote emulsification and stabilize the P(3HB-co-4HB)/pullulan composite solution. Drug-loading property of the nanofibers with a shell-core structure is increased because gelatin was not formed into fibers via electrospinning, thereby forming a stable drug-containing gelatin solution in the core layer. Finally, P(3HB-co-4HB)/pullulan-gelatin shell-core nanofibers were prepared. The intermolecular interaction, morphology, crystallization properties, mechanical properties, morphology, sustained release, and biocompatibility of composite nanofibers were characterized. Results show that the crystallization property of P(3HB-co-4HB)/pullulan composite nanofibers increases continuously with an increase in the pullulan content. As the pullulan content increases, the strain and stress of P(3HB-co-4HB)/pullulan nanofibers increase initially and decrease later. At the mass ratio of P(3HB-co-4HB) to pullulan of 10:2, P(3HB-co-4HB)/pullulan composite nanofibers exhibit a uniform morphology with an average diameter of 590 nm and porosity of 70.71%. At this mass ratio, the P(3HB-co-4HB)/pullulan-gelatin/drug shell-core structure, which sustained a release effect for more than 180 h, has potential applications as biomaterials without cytotoxicity.

Development of (G3-C12)-mediated camptothecin polymeric prodrug targeting to Galectin-3 receptor against androgen-independent prostate cancer

Xia Yuan,Li Liu,Wei Wang,Ya-ru Gao,Die Zhang,Ting-ting Jia,Hai-rong Zeng,Gang Pan,Yi Yuan

The development of small molecule anticancer drugs , with low water solubility and high toxicity, into polymeric prodrugs has developed into a promising strategy in clinical application. In this study, we synthesized a novel G3-C12-mediated esterase-sensitive tumor-targeting polymeric prodrug of camptothecin (CPT), P(OEGMA- co -CPT- co -G3-C12), and explored its anticancer activity against androgen-independent prostate cancer in vitro and in vivo. Compared to free CPT, the multifunctional polymeric prodrug demonstrated improved water solubility and stability, higher intracellular uptake, and enhanced cytotoxicity in DU145 cells in vitro. Furthermore, it displayed an improved accumulation in the tumor and an enhanced anticancer activity in vivo. Hence, P(OEGMA- co -CPT- co -G3-C12) could be a promising drug in the treatment of androgen-independent prostate cancer.

Recovery of neodymium, dysprosium, and cobalt from NdFeB magnet leachate using an unsymmetrical dialkylphosphinic acid extractant, INET-3

Zhengyu Liu,Jiaming Wu,Xinyu Liu,Wen Wang,Ziwei Li,Ruijing Xu,Yue Ding,Junlian Wang

Rare earths (REs) and Co are critical strategic resources. Their recovery is crucial for ensuring that their supplies are adequate and for reducing environmental pollution. End-of-life NdFeB magnets are important secondary RE sources. The separation of Dy, Nd, and Co from NdFeB leachate using a relatively new extractant (2,3-dimethylbutyl) (2,4,4′-trimethylpentyl)phosphinic acid (INET-3), was investigated in this study. The separation parameters, such as equilibrium pH, phase ratio, INET-3 concentration, and number of counter-current extraction stages, were optimised. The results show that INET-3 can separate Dy, Nd, and Co efficiently. For the preferential extraction of Dy from synthetic iron-free NdFeB leachate, the optimum equilibrium pH is 2.60. Under this condition, separation of Dy from the leachate requires four counter-current extraction stages at A/O (volume ratio of aqueous to organic) = 1:2. This is demonstrated by a simulated four-stage counter-current extraction process. At equilibrium pH = 2.52 and A/O = 1:2, 98% of Dy is recovered with 95% purity. As to the subsequent separation of Nd from the leachate, nearly 100% is recovered with 99% purity through a simulated three-stage counter-current extraction process at equilibrium pH = 5.33 and A/O = 1:1. Approximately 95% of Co remains in the raffinate with 99.98% purity.

Penicimutanin C, a New Alkaloidal Compound, Isolated from a Neomycin-Resistant Mutant 3-f-31of Penicillium purpurogenum G59

Nan Wang,Yuan Dong,Yu Yang,Rui Xu,Chang-Wei Li,Cheng-Bin Cui

Penicimutanin C, a new alkaloidal compound, was isolated from the neomycin-resistant mutant strain 3-f-31 of the marine-derived fungus, Penicillium purpurogenum G59, together with four known compounds. The structure of penicimutanin C, including the absolute configuration, was determined by spectroscopic and chemical methods. The absolute configuration of penicimutanin A was also re-confirmed by Marfey's and chiral HPLC analyses of the hydrolyzed products. Penicimutanins C and A inhibited the proliferation of five human cancer cell lines to some extent. Penicimutanin C is the third dimer of diketopiperazine and penicimutanolone, which are only produced by mutants of P. purpurogenum G59 isolated to date, and it showed cytotoxic activity against human cancer cell lines. The neomycin-resistant screening strategy has been previously successfully used to discover new compounds by activating silent metabolites in fungi, and the present results provide an additional example of the effectiveness of this method. Graphical

La(OH)3-decorated NiFe nanoparticles as efficient catalyst for hydrogen evolution from hydrous hydrazine and hydrazine borane

Hongtao Zou,Feng Guo,Minghong Luo,Qilu Yao,Zhang-Hui Lu

Ultrafine NiFe nanoparticles (NPs) decorated by La(OH) 3 have been successfully prepared via a facile one-step co-reduction method without the help of surfactant or support. It was found that after being decorated with La(OH) 3 , the NiFe–La(OH) 3 NPs have a smaller particle size and lower crystallinity . The resultant NiFe–La(OH) 3 nanocatalyst exhibits an excellent catalytic activity , 100% H 2 selectivity, and satisfied recyclability for hydrogen evolution from hydrous hydrazine (N 2 H 4 ·H 2 O) at 343 K under alkaline conditions, giving a high turnover frequency (TOF) value of 100.6 h −1 , which is more than 35 times higher than pure NiFe NPs (2.8 h −1 ). The kinetics study shows that with respect to the concentration of catalyst and N 2 H 4 , the N 2 H 4 dehydrogenation reaction follows fist-order kinetics and zero-order kinetics, respectively. Furthermore, NiFe–La(OH) 3 also exhibits an outstanding performance and excellent recycle stability during high dehydrogenation of hydrazine borane (N 2 H 4 BH 3 ). The excellent performances for the dehydrogenation of N 2 H 4 and N 2 H 4 BH 3 could be attributed to the strong interaction between La(OH) 3 and NiFe NPs, as well as ultrafine and low crystalline NiFe NPs due to the addition of La(OH) 3 .

Self-Supported 3 D Ultrathin Cobalt–Nickel–Boron Nanoflakes as an Efficient Electrocatalyst for the Oxygen Evolution Reaction

Hefeng Yuan,Shiwei Wei,Bin Tang,Zizai Ma,Jinping Li,Manab Kundu,Xiaoguang Wang

Graphical Flakes make O 2 : Self-supported ultrathin CoNiB nanoflakes are prepared by a simple one-step solid-state boronation. The unique sheet-like structure, bimetallic boride components, and optimal hybrid crystalline nature enable a synergistic promotion for the catalysis of the oxygen evolution reaction with long-term stability. The development of highly active and efficient nonprecious-metal electrocatalysts for the oxygen evolution reaction is important for the design of renewable energy production and storage devices. In this work, highly dense, ultrathin Co–Ni boride nanoflakes supported on a 3 D CoNi skeleton are fabricated in situ by a simple one-step, high-temperature, solid-state boronation process. As a result of the induced high electroactive surface area and low charge transfer resistance, CoNiB-700 exhibits high catalytic activity at an overpotential of 262 ( η 10 ) and 284 mV ( η 20 ) to deliver current densities of 10 and 20 mA cm −2 , respectively, with a Tafel slope of 58 mV dec −1 in an alkaline medium towards the oxygen evolution reaction. DFT calculations show that the Ni-regulated Co–B compound has a lower rate-determining energy barrier for the *OOH intermediate than the mono-Co–B compound, which facilitates the production of more active catalytic sites for an accelerated surface charge-transfer process for the oxygen evolution reaction.

Fabrication and characterization of β-cyclodextrin-epichlorohydrin grafted carboxymethyl chitosan for improving the stability of Cyanidin-3-glucoside

Jianxia Sun,Jiali Chen,Yanmei Bi,Yuhang Xiao,Lijun Ding,Weibin Bai

Cyanidin-3-glucoside (C3G), an anthocyanin constituent of fruits and vegetables. It has been proven to possess numerous health benefits with no side effects. However, the poor stability of C3G is an intractable property that limits its application. Hence, the aim of this study is to improve the stability of C3G through the formation of well dispersed nanoparticles. In this study, C3G loaded β -CD-EP-CMC nanoparticles exhibited nearly spherical with good disperse and homogeneous morphology. Results also indicated that the nanoparticles formation of grafting of C3G to β -CD-EP-CMC could significantly improve the stability of C3G to against thermal or light degradation. Collectively, current results strongly aligned with the prospective purpose that the grafting of C3G to β -CD-EP-CMC nanoparticles could be treated as an effective approach for improving the stability. This study opens a new avenue for the utilization and development of novel wall materials β -CD-EP-CMC in C3G associated nutraceutical.

Scalable synthesis of Na3V2(PO4)3/C with high safety and ultrahigh-rate performance for sodium-ion batteries

Guijia Cui,Hong Wang,Fengping Yu,Haiying Che,Xiaozhen Liao,Linsen Li,Weimin Yang,Zifeng Ma

NASICON-type Na 3 V 2 (PO 4 ) 3 is a promising electrode material for developing advanced sodium-ion batteries. Preparing Na 3 V 2 (PO 4 ) 3 with good performance by a cost-effective and large-scale method is significant for industrial applications. In this work, a porous Na 3 V 2 (PO 4 ) 3 /C cathode material with excellent electrochemical performance is successfully prepared by an agar-gel combined with freeze-drying method. The Na 3 V 2 (PO 4 ) 3 /C cathode displayed specific capacities of 113.4 mAh·g −1 , 107.0 mAh·g −1 and 87.1 mAh·g −1 at 0.1 C, 1 C and 10 C, respectively. For the first time, the 500-mAh soft-packed symmetrical sodium-ion batteries based on Na 3 V 2 (PO 4 ) 3 /C electrodes are successfully fabricated. The 500-mAh symmetrical batteries exhibit outstanding low temperature performance with a capacity retention of 83% at 0 °C owing to the rapid sodium ion migration ability and structural stability of Na 3 V 2 (PO 4 ) 3 /C. Moreover, the thermal runaway features are revealed by accelerating rate calorimetry (ARC) test for the first time. Thermal stability and safety of the symmetrical batteries are demonstrated to be better than lithium-ion batteries and some reported sodium-ion batteries. Our work makes it clear that the soft-packed symmetrical sodium ion batteries based on Na 3 V 2 (PO 4 ) 3 /C have a prospect of practical application in high safety requirement fields.