查找使用阿拉丁产品的科研文献

High-rate and non-toxic Na7Fe4.5(P2O7)4@C for quasi-solid-state sodium-ion batteries

Guangyuan Du,Mengli Tao,Yuruo Qi,Wei Gao,Shu-juan Bao,Maowen Xu

A sustainable and non-toxic polyanionic cathode material is an ideal choice for high-performance eco-friendly sodium-ion batteries (SIBs), but most of the polyanionic cathode materials contain vanadium/chromium or other toxic atoms. Based on Fe atoms, pyrophosphate polyanionic Na7Fe4.5(P2O7)4 is a promising candidate to meet the sustainable, non-toxic and cost-effective requirements. However, its inferior rate capability hinders its further application. Besides, employing quasi-solid-state polymer electrolytes (QSPEs) is an advisable strategy to mitigate the shortcomings of traditional SIBs caused by liquid electrolytes. In light of this, a high-rate carbon-coated Na7Fe4.5(P2O7)4@C (NFPO@C) cathode and a quasi-solid-state polymer electrolyte membrane (PFSA-Na) with high ionic conductivity are provided in this work. Quasi-solid-state full cells based on the NFPO@C cathode, the PFSA-Na membrane and the hard carbon anode can enable high-rate performances and extremely stable cycle life at 20C with a capacity decay of 0.0057% per cycle for 2000 cycles. The NFPO@C cathode material, PFSA-Na membrane and full cells demonstrated here could pave the way for high-rate quasi-solid-state sodium-ion batteries for practical application.

Synthesis, Structure and Chemical Bonding of Polyantimony Clusters Containing Coinage Metals [M2Sb14]4– (M = Cu, Ag)

Wei-Xing Chen,Yu-He Xu,Cui-Cui Wang,Lei Qiao,Zi-Yan Guo,Wen-Juan Tian,Zhong-Ming Sun

Comprehensive Summary Binary polyantimony clusters, namely [Cu 2 Sb 14 ] 4– and [Ag 2 Sb 14 ] 4– , containing coinage metals, were successfully synthesized and characterized, in which two homoatomic Sb 7 3– subunits are bridged by two coinage metals in η 4 : η 1 and η 1 : η 1 coordination modes, respectively. In [Cu 2 Sb 14 ] 4– , two bridging Cu ions and two Sb atoms form a planar rhombic unit, which was revealed to have antiaromatic properties by theoretical calculations. Further electron structure and bonding analysis confirmed the presence of delocalized bonds in the rhombic unit and the metallophilic interaction between two formal M + ions.

Effects of hydrogen sulfide (H2S) on respiration control of state 3/4 in mitochondria from bovine heart

Y Su,Y Cheng,D Wang,F Zhang,Y Su,Z Li

Synergistically enhanced electrochemical sensor based on a covalent organic framework/carbon nanotube composite for 4-nitrophenol detection

Xue Jun-Chang,Jiang Yue,Xia Huan,Hou Lu,Li Heng-Ye,Wang Zhong-Xia,Kong Fen-Ying,Wang Wei

An electrochemical sensor was developed for the sensitive voltammetric determination of 4-nitrophenol (4-NP) by integrating an in situ grown nanocomposite of amino-functionalized carbon nanotubes (NH 2 -CNTs) and a zinc porphyrin-tetrathiafulvalene covalent organic framework (TTCOF-Zn). This hybrid design strategically couples the electron donor–acceptor (D-A) architecture of TTCOF-Zn, featuring pre-engineered electron transport channels, with the exceptional electrical conductivity of NH 2 -CNTs via covalent bonding, synergistically enhancing charge transfer efficiency. Leveraging the high conductivity, abundant active sites, and hierarchical porosity of the TTCOF-Zn/NH 2 -CNTs nanocomposite, the modified electrode achieves an exceptional detection limit of 17 nM (linear range, 50 nM–1 mM) using differential pulse voltammetry, surpassing most reported sensors. The sensor also demonstrates excellent reproducibility, long-term stability, and strong anti-interference capability against common co-existing species. Its practical applicability was demonstrated through quantitative analysis of 4-NP in real lake water samples, with results validated by the HPLC method, underscoring the potential of D-A COF/CNT covalent hybrids for high-performance environmental monitoring. Graphic

Simultaneously Photocatalytic H2 Production and C–C Coupling of 4-Pyridinemethanol on Pt Doped CdS/TiO2 Heterojunction

Li Qing,Yang Yuke,Li Huajing,Yang Yiwen,Ma Siyu,Su Qiuxing,Shi Yonghong,Li Yuangang

The synergistic coupling of photocatalytic hydrogen production with high-value-added organic conversion provides a new research direction for the efficient use of solar energy and green chemical synthesis. However, key challenges remain in the same catalytic system, such as severe carrier recombination and difficulty in precisely controlling the interfacial reaction pathways. To address these issues, we construct CdS/TiO 2 heterojunction photocatalysts with Pt species introduced by ion exchange and photodeposition. As a result, the Cd(Pt)S/TiO 2 –Pt composite photocatalyst is successfully prepared. Under visible light irradiation, the catalyst achieves highly selective conversion of 4-pyridinemethanol to the C–C coupling product 1, 2-di(4-pyridyl)-1,2-ethanediol, with a selectivity of 89.22%. Under optimized reaction conditions, the maximum H 2 production rate of the catalyst reaches 4.66 mmol·g –1 ·h –1 . Mechanistic studies show that the photogenerated holes enriched on the surface of Cd(Pt)S drive the sp 3 C–H dehydrogenation of 4-pyridinemethanol to form •CH(OH)C 5 H 4 N radicals, which then undergo radical coupling to form new C–C bonds. Meanwhile, the photogenerated electrons transfer through TiO 2 to the Pt active sites to participate in hydrogen evolution. This study provides new insights into regulating the selective conversion of radicals via interfacial electronic engineering and designing photocatalytic coupled reaction systems.

S1-4 aptamer-mediated iron oxide nanoparticles for targeted magnetic hyperthermia in MCF-7 breast cancer cells

Enyuan Chen,Yu Yin,Xiaoyun Miao,Bin Yu,Jun Yang,Mingming Li,Xiaoyun Wang,Caifang Ni

Objective: To develop S1-4 aptamer-conjugated citric acid-coated Fe3O4 nanoparticles and evaluate their targeting ability and magnetic hyperthermia effect against MCF-7 breast cancer cells.Methods: Citric acid-coated Fe3O4 nanoparticles were synthesized by chemical co-precipitation and subsequently conjugated with the S1-4 aptamer to fabricate S1-4 aptamer-conjugated citric acid-coated Fe3O4 nanoparticles. The nanoparticles were characterized by X-ray diffraction, transmission electron microscopy, dynamic light scattering, zeta potential analysis, Fourier transform infrared spectroscopy, and vibrating sample magnetometry. Biocompatibility was assessed in MCF-7 and MEF cells; cellular targeting was examined by Prussian blue staining; and the magnetic hyperthermia effect under an alternating magnetic field was evaluated by cell viability, live/dead staining, and apoptosis assays.Results: Compared with citric acid-coated Fe3O4 nanoparticles, S1-4 aptamer-conjugated citric acid-coated Fe3O4 nanoparticles exhibited a larger hydrodynamic diameter (17 ± 4 nm vs. 8 ± 3 nm) and a more negative surface charge (−26.7 ± 0.3 mV vs. −19.7 ± 0.5 mV). Fourier transform infrared spectroscopy confirmed successful aptamer conjugation. Both nanoparticles demonstrated good biocompatibility in MCF-7 and MEF cells. Prussian blue staining demonstrated stronger cellular uptake of S1-4 aptamer-conjugated citric acid-coated Fe3O4 nanoparticles in MCF-7 cells. Under alternating magnetic field exposure, S1-4 aptamer-conjugated citric acid-coated Fe3O4 nanoparticles produced a significantly greater hyperthermia effect than the controls, resulting in reduced cell proliferation and increased apoptosis in MCF-7 cells (P < 0.01).Conclusions: S1-4 aptamer-mediated Fe3O4 nanoparticles demonstrated active targeting ability and enhanced the antitumor effect of alternating magnetic field–mediated magnetic hyperthermia in breast cancer cells and maintained low cytotoxicity under the tested conditions, suggesting that they may be a feasible platform for targeted magnetic hyperthermia.

Dual engine drive: The synergy of Mn and Ti 4 O 7 achieves highperformance acidic water oxidation

Xin Li,Zhongya Jia,Yi Wang,Kuo Liu,Xi Li,Tao Qi

The development of electrocatalysts that simultaneously exhibit high activity and robust stability for the oxygen evolution reaction (OER) is critical to advancing proton exchange membrane water electrolysis (PEMWE). In this work, Mn-doped RuO2 is composited with acid-resistant and highly conductive Ti4O7 via a simple molten salt method, yielding a Mn-RuO2/Ti4O7 hybrid electrocatalyst. Electrochemical measurements reveal that Mn-RuO2/Ti4O7 achieves a low overpotential of 194 mV at 10 mA cm⁻² and maintains stable operation for over 220 h at this current density. In situ spectroscopic analysis and computational studies further indicate that Mn doping modulates the electronic interplay between RuO2 and Ti4O7, which not only suppresses over-oxidation of Ru at high potentials but also promotes the deprotonation kinetics of reaction intermediates, thereby significantly enhancing the overall catalytic performance. This work offers an effective strategy for balancing activity and stability in acidic OER electrocatalys.

Achieving high R9 full-spectrum white LEDs through novel Na5Lu(WO4)4 Eu3+ narrow-band red phosphors

Liang Yang,Jianwei Dao,Zhihao Jiang,Tiqun Wei,Zihao Han,Yajie Deng

Narrow-band red phosphors offer highly effective solution to the red-spectral deficiency that has long compromised the color rendering quality of phosphor-converted white light-emitting diodes (LEDs). Herein, we report novel tungstate-based Na 5 Lu(WO 4 ) 4 :Eu 3+ (NLWO:Eu 3+ ) red phosphor synthesized by high-temperature solid-state reaction. The distinctive tetragonal framework of the Na 5 Lu(WO 4 ) 4 host provides non-centrosymmetric Lu 3+ sites that favor the hypersensitive 5 D 0 → 7 F 2 electric dipole transition of Eu 3+ , yielding an exceptionally pure red emission at 618.9 nm with a remarkable color purity of 96.22%. A systematic investigation of the concentration-dependent luminescence reveals that electric dipole-dipole interactions dominate the energy transfer and quenching behavior, with the optimal Eu 3+ content identified at x = 0.21. Importantly, the phosphor retains 78.7% of its room-temperature emission intensity at 423 K, corresponding to activation energy of 0.246 eV, indicative of robust thermal stability suitable for LED application. A full-spectrum white LED device was constructed by integrating the optimized NLWO:Eu 3+ phosphor with commercial blue and green components on 397 nm n-UV chip. The device delivers high-quality white light with a high general color rendering index (Ra = 87.5) and a markedly enhanced R9 value of 89.8, far exceeding that of conventional YAG:Ce-based white LEDs, along with comfortable correlated color temperature of 6038 K. This work presents a viable red phosphor solution for bridging the red gap in full-spectrum lighting, highlighting the potential of tungstate hosts as robust platforms for high-performance phosphor development.

Controlled synthesis of tertiary amine functionalized 1,3-pentadiene-based copolymers via living anionic copolymerization with 4-vinylbenzylpiperidine

Kun Liu,Yao Long,Jiahao Zhou,Xinrui Zhang,Weiyu Luo,Wenwen Lin,Haofeng Zhu,Shikun Zhao,Xupeng Han,Jundong Xu,Fengli Xie,Kang Zhang,Lijun Li

VBMP serves as both a weakly coordinating polarity regulator and a pendant functional group, achieving “one reagent, two functions” and enabling quantitative functionalization with controlled microstructure. • The significantly higher reactivity of VBMP ( r VBMP  = 2.79–3.10) over PD ( r PD  = 0.02–0.11) provides a thermodynamic basis for constructing composition-gradient sequences in functionalized polydienes. • A synergistic N–Li coordination involving both chain-end active centers and in-chain tertiary amine groups explains how low mole fractions of VBMP dramatically affect chain segment regularity in non-polar solvents. To develop 1,3-diene-based polymers with both tertiary amine functionalization and controllable microstructure, in this work, 4-vinylbenzylpiperidine (VBMP) was used as a tertiary amine functional monomer and achieves the controlled copolymerization of VBMP and 1,3-Pentadiene (PD) under mild conditions above room temperature in cyclohexane solvent by using living anionic polymerization. By taking advantage of the dual functions of VBMP as both a comonomer and a polarity regulator, and through optimizing the monomer feed ratio, poly(PD- co -VBMP) copolymers with controllable molecular weight and narrow molecular weight distribution (1.08 <  Đ  < 1.15) were successfully prepared. 1 H NMR spectroscopy and Fourier Infrared analysis confirmed that VBMP was inserted into the polymer backbone through in situ copolymerization, with a controlled functionalization degree. The detailed instantaneous composition distribution under different feed ratios was obtained through online 1 H NMR analysis. The reactivity ratios ( r PD  = 0.02–0.11 and r VBMP  = 2.79–3.10) were obtained by Fineman-Ross and Kelen-Tudos methods. Moreover, DSC analysis indicated that as the content of VBMP increased, the glass transition temperature ( T g ) of the copolymers gradually rose from −10 °C to 49 °C, and the regularity of the chain segments was significantly improved. In addition, the LAP (living anionic polymerization) chain end active center coordination mechanism, and the N-Li coordination synergy mechanism in the polymer backbone were proposed to explain the experimental results. In summary, this polymerization system not only exploits the weak regulatory effect of the tertiary amine group of VBMP on anionic polymerization but also achieves tertiary amine functionalization of 1,3-pentadiene-based gradient sequence copolymers, providing an efficient approach for preparing functional materials with both elastic properties and reactive sites. Download: Download high-res image (144KB) Download: Download full-size image

Synergistic formulation of terpinen-4-ol and 1,8-cineole: A chitosan-based strategy for sustained antibacterial activity

Zhaomei Huo,Zhixia Wang,Fulin Li,Hang Song

Artificial formulation has higher antibacterial activity than tea tree oil (TTO). • The formation and physical properties of nanoemulsions is studied systematically. • Nanoemulsions exhibit superior antibacterial efficacy than reported nano-TTO. • Chitosan and the essential oil components exhibit a synergistic antibacterial effect. The volatility and instability of essential oil components often limit their practical application in antibacterial materials. In this study, a chitosan-based nanoemulsion (NE) loaded with an artificially designed synergistic formulation of two key components from tea tree oil (TTO) was developed to achieve enhanced and sustained antibacterial activity. The optimal 9:1 (v/v) ratio of terpinen-4-ol to 1,8-cineole, produced inhibition zones of 25.8 mm against S. aureus and 22.8 mm against E. coli , thereby outperforming commercial TTO (14.5 mm and 12.5 mm). Guided by pseudo-ternary phase diagrams, the formation of NE was determined. A 3:1 mass ratio of surfactant Tween 80 to co-surfactant ethanol yielded the largest nanoemulsifying region (38.33%), whereas 0.1% chitosan aqueous solution provided optimal antibacterial efficacy, uniform particle size (Z-Ave: 16.89 nm; PDI: 0.26), and good stability. Conductivity and viscosity changes were conducted to analysis the critical transition points of NEs, and NEs transitioned to the oil in water (O/W) phase when chitosan aqueous content exceeded 60% by mass. Interestingly, unlike the essential oil, the nanoemulsion exhibited higher antibacterial activity against E. coli than S. aureus , with minimum inhibition concentration of 3.91 μL·mL -1 and 7.81 μL·mL -1 , respectively. Chitosan rendered the nanoemulsion positively charged, facilitating easier interaction with the negatively charged cell walls of gram-negative bacteria. SEM revealed that NEs disrupted bacterial cell wall and membrane structures, leading to cell death and antibacterial activity. Additionally, the NEs demonstrated notable long-lasting effects. Overall, these eco-friendly NEs offer a promising alternative to antibiotics, especially for gram-negative bacteria inhibition. We designed chitosan-based nanoemulsion (NE) loaded with an artificially designed synergistic formulation of two key components from tea tree oil (TTO), achieving enhanced and sustained antibacterial activity. Guided by pseudo-ternary phase diagrams, the formulation of NE was determined. Moreover, conductivity and viscosity changes were conducted to analysis the critical transition points of NEs. Notably, the nanoemulsion exhibited minimum inhibition concentration of 3.91 μL·mL -1 and 7.81 μL·mL -1 against Escherichia coli and Staphylococcus aureus , respectively, which outperformed reported nano-TTO of 48.8 μL·mL -1 . Additionally, the NEs demonstrated notable long-lasting effects. Overall, these eco-friendly NEs offer a promising alternative to antibiotics. Download: Download high-res image (263KB) Download: Download full-size image

Preparation of biodegradable poly(lactic acid)-b-polyamide 4 block poly(ester amide) and its electrospun fibers

Fan Mo,Chen Tian,Rongrong Ji,Shixing Dong,Linwei Liang,Ling Zhou,Hao Wu,Xipo Zhao

Poly(ester amide) (PEA) contains both ester bonds (–COO–) and amide bonds (–NHCO–) within its molecular backbone. Through strategic monomer selection and molecular structure design, PEAs have the potential to simultaneously exhibit excellent biodegradability and mechanical properties, making them a promising class of materials with significant research interest and application potential. In this study, poly(lactic acid) (PLA) was synthesized from L-lactic acid via melt polycondensation, followed by terminal thiolation modification. Subsequently, a biodegradable PLA-b-PA4 block poly(ester amide) was prepared through a thiol–ene click reaction with the synthesized polyamide 4 (PA4). The molar ratios of polyester to polyamide repeating units in the copolymers were 11 : 26 and 23 : 26. Comprehensive structural characterization of thiol-terminated PLA and the synthesized block poly(ester amide) was conducted using MALDI-TOF MS, FTIR, Raman, XPS, and 1H-NMR spectroscopy. Systematic study revealed that variations in PLA chain length significantly influenced the properties of the PEA, with the PLA and PA4 segments undergoing phase separation in the melt and exhibiting mutually suppressed crystallization behavior. Electrospinning was employed to process the PEA. The electrospinning process reduces the crystallinity of both PLA and PA4. The morphology and properties of the electrospun fibers were influenced by the PLA block ratio. Poly(ester amide)s containing short-chain PLA segments produced electrospun fibers with larger diameters, exhibiting better mechanical strength and ductility. As the PLA chain length increased in the copolymer, bead formation appeared in the electrospun fibers, accompanied by a decrease in fiber diameter and a deterioration in mechanical performance. This study provides experimental evidence and theoretical insights into the structure–property relationships of fully biodegradable block poly(ester amide)s and their application in electrospinning.

A Multivalent Aptamer-Driven “4 + 1” Nanozyme Platform for Ultrasensitive Detection and Synergistic Inactivation of Salmonella typhimurium

Qing Kang,Yidi Liu,Xiubing Cui,Jianming Chu,Tong Lin,Jingbo Jiao,Xinjun Du,Shuo Wang

Herein, we developed a novel “4 + 1” biosensing platform based on cascaded nucleic acid amplification and nanozyme activity, enabling fluorescence-colorimetric dual-mode detection and efficient inactivation of Salmonella Typhimurium (S. typhimurium). The “4 + 1” system incorporates a multi-component strategy featuring multivalent aptamers for enhanced target recognition, coupled with a quadruple signal amplification strategy involving exponential amplification reaction (EXPAR), hybridization chain reaction (HCR), multivalent aptamers, and functional nanozymes (Fe3O4 and Fe-PDs), thereby achieving synergistic antibacterial effects. It achieves a wide linear range of 3 × 101–3 × 107 CFU/mL, with detection limits of 7.7 CFU/mL for fluorescence and 8.7 CFU/mL for colorimetry. Furthermore, the system exhibits antibacterial capability by catalytically generating reactive oxygen species (ROS), reducing the risk of secondary contamination. When applied to spiked milk samples, the biosensor showed satisfactory recovery rates and reproducibility. The study provides a high-precision, low-cost analytical solution for detecting and inactivating foodborne pathogens, demonstrating significant potential for rapid on-site food safety monitoring.