ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2013
·Vol. 406
·期 5
·1551-1556
·
IF 3.659
Su Zihao,Zhai Haiyun,Chen Zuanguang,Zhou Qing,Li Jiangmei,Liu Zhenping
A method was developed to sensitively determine safranine T in wolfberry by molecularly imprinted solid-phase extraction (MISPE) coupled with high-performance liquid chromatography and laser-induced fluorescence detection (HPLC-LIF). The MISPE capillary monolithic column was prepared by water-bath in situ polymerization, using safranine T, methacrylic acid (MAA), and ethylene dimethacrylate (EDMA) as template, functional monomer, and cross-linker, respectively. The properties of the homemade MISPE capillary monolithic column, including capacity and specificity, were investigated under optimized conditions and the morphologies of inner polymers were characterized by scanning electron microscopy (SEM). The mean recoveries of safranine T in wolfberry ranged from 91.2 % to 92.9 % and the intraday and interday relative standard deviation (RSD) values all ranged from 3.4 % to 4.2 %. Good linearity was obtained over 0.001–1.0 μg mL –1 ( r = 0.9999) with a detection limit (S/N = 3) of 0.4 ng g –1 . Under the selected conditions, enrichment factors of over 90-fold were obtained and the extraction on the monolithic column effectively cleaned up the wolfberry matrix. The results demonstrated that the proposed MISPE-HPLC-LIF method could be applied to sensitively determine safranine T in wolfberry.
SEM images of the monolithic column prepared with different initiation reaction methods: a UV initiation; b water bath; c 5000-folds magnification of b ; d 20000-folds magnification of b
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高影响因子
IONICS
·
2020
·Vol. 26
·期 10
·4825-4833
·
IF 2.394
Liu Jiuqing,Xi Yang,Li Qihou,Li Jie,Liu Meng,Wang Cheng,Hong Zikun,Song Feifei,Bai Lishun,Zeng Fanli
The high performance and safety of lithium-sulfur (Li-S) batteries are the focus of research in recent years. The separator is an important part of the battery, whose performance stability directly affects the performance of the battery. What’s more, there are still many defects in the commercial polyolefin separator. In this work, a polyethylene/polyetherimide (PE/PEI) composite separator is designed by surface coating and non-solvent-induced phase separation (NIPS) method. The film breakage temperature and anti-puncture strength of the PE/PEI composite separator (181.96 °C, 7.90 N) are higher than those of the commercial PE separator (153.00 °C, 6.20 N), which will greatly ensure the safety problems caused by internal self-heating and external short circuit of Li-S batteries. The PE/PEI composite separator–based Li-S battery delivers a high initial specific capacity of 1265 mAh g −1 at 0.2 C and exhibits excellent rate capability compared with the commercial PE separator. Therefore, the PE/PEI composite separator is a candidate separator for the high-performance and high-safety Li-S battery.
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IONICS
·
2021
·Vol. 27
·期 9
·3943-3950
·
IF 2.817
Cai Xinhao,Li Hanghang,Li Jing,Yan Huihui,Liu Yiwen,Yu Haoxiang,Yan Lei,Zhang Liyuan,Shu Jie
Rechargeable aqueous Zn/MnO 2 battery with mild electrolyte is exceedingly suitable for massive electrochemical applications due to its eco-friendliness and high safety. However, cycle stability is a crucial question in the practical application. Besides, the mechanism involved in energy storage is still controversial. Here, we show a Zn/MnO 2 battery with excellent cycle stability and provide the reasonable explanation of the operating mechanism. In this battery, the mild aqueous ZnSO 4 solution containing MnSO 4 and Na 2 SO 4 additives serves as the electrolyte and the β-MnO 2 nanorods serve as the cathode. As presented in the electrochemical tests, the specific capacity of β-MnO 2 nanorods is as high as 323.5 mA h g −1 , and its capacity retention is 94% after 1000 cycles at 3 A g −1 . The proposed energy storage mechanism is related to the reversible conversion reaction between β-MnO 2 and MnOOH. Therefore, the application of β-MnO 2 nanorods in aqueous Zn-ion battery has broad development prospects. Graphical abstract
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Science China-Materials
·
2020
·Vol. 64
·期 3
·557-570
·
IF 6.098
Li Yanwei,Ji Jingcheng,Yao Jinhuan,Zhang Ying,Huang Bin,Cao Guozhong
A fundamental understanding of the electrochemical reaction process and mechanism of electrodes is very crucial for developing high-performance electrode materials. In this study, we report the sodium ion storage behavior and mechanism of orthorhombic V 2 O 5 single-crystalline nanowires in the voltage window of 1.0–4.0 V (vs. Na/Na + ). The single-crystalline nanowires exhibit a large irreversible capacity loss during the first discharge/charge cycle, and then show excellent cycling stability in the following cycles. At a current density of 100 mA g −1 , the nanowires electrode delivers initial discharge/charge capacity of 217/88 mA h g −1 , corresponding to a Coulombic efficiency of only 40.5%; after 100 cycles, the electrode remains a reversible discharge capacity of 78 mA h g −1 with a fading rate of only 0.09% per cycle compared with the 2 nd cycle discharge capacity. The sodium ion storage mechanism was investigated, illustrating that the large irreversible capacity loss in the first cycle can be attributed to the initially formed single-crystalline α′-Na x V 2 O 5 (0.02 < x < 0.88), in which sodium ions cannot be electrochemically extracted and the α′-Na 0.88 V 2 O 5 can reversibly host and release sodium ions via a single-phase (solid solution) reaction, leading to excellent cycling stability. The Na+ diffusion coefficient in α′-Na x V 2 O 5 ranges from 10 −12 to 10 −11.5 cm 2 s −1 as evaluated by galvanostatic intermittent titration technique (GITT).
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Scientific Reports
·
2025
·Vol. 15
·期 1
·1-11
·
IF 3.9
Chen Yuan-Bin,Xiong Siyi
The Na 5 Tm 1 − x (Y 1/3 Yb 2/3 ) x (MoO 4 ) 4 ceramics (x=0-0.18) were successfully synthesized via the solid-state reaction method. XRD analysis revealed that they possessed a single-phase tetragonal scheelite structure belonging to the space group I4₁/a(88). SEM analysis demonstrated that the samples sintered at 600 °C exhibited a dense microstructure, with a relative density as high as 94.9% and an average grain size ranging from 2.172 μm to 2.424 μm. The relative density serves as an external factor influencing ε r and Q×f, while τ f is related to bond valence. The ionicity of the Tm-O bond, and the lattice energy and bond energy of the Mo-O bond are the intrinsic factors determining ε r , Q×f, and τ f , respectively. Raman spectroscopy provided an intuitive characterization of the vibrational properties of the [MoO 4 ] 2− tetrahedra within the ceramics. Although the pure phase Na₅Tm(MoO 4 ) 4 ceramic exhibited optimal dielectric properties (ε r =8.025, Q×f=18,967 GHz, and τ f = -101 ppm/°C) at 625 °C, the Na 5 Tm 0.91 Y 0.03 Yb 0.06 (MoO 4 ) 4 ceramic sintered at 600 °C demonstrated superior dielectric properties (ε r =7.82, Q×f=34,752 GHz, and τ f = -71.9 ppm/°C).
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高影响因子
npj Clean Water
·
2025
·Vol. 8
·期 1
·1-17
·
IF 11.4
Xu Dan,Cao Xiaolin,Zhou Jie,Lin Zhihao,Wang Jing,Han Jiatong,Chen Ge,Liu Guangyang,Xu Xiaomin,Zhang Yanguo,Xu Donghui
To address the environmental threats posed by dye pollution, it is crucial to develop adsorbents with high selectivity and adsorption capacity for the removal of chemical dye pollutants. In this study, five types of Ni/Fe-MOFs were synthesized via a one-pot solvothermal method by varying the Ni/Fe molar ratio. Their physicochemical structures, surface morphologies, and compositions were characterized through a series of techniques, and their adsorption performances for different dyes were preliminarily investigated. The results demonstrated that the Ni/Fe ratio significantly affects the microstructure and adsorption performance of the MOFs. As the molar ratio of Ni/Fe increased, the structures of the five materials transformed from nanoflowers (Fe-MOFs) to nanospheres (Ni/Fe(3:1)MOFs) , and eventually to rhombic blocks (Ni-MOFs) . The specific surface area decreased from 281.3 m²/g (Fe-MOFs) to 67.11 m²/g (Ni/Fe(1:1)MOFs) and further to 0.5369 m²/g (Ni-MOFs) . XPS analysis confirmed the synergistic coordination between Ni and Fe, and FT-IR spectra revealed characteristic peaks for hydroxyl groups on the MOF surface and carboxylate ligands. XRD analysis indicated that materials with higher Ni content were more prone to ligand decomposition, which is consistent with the weight loss observed in the TG-DSC between 230 and 350 °C. The materials exhibited selective adsorption for different dyes. Under optimal conditions, the maximum adsorption capacities for Eosin Y (EY), Neutral Red (NR), and Acid Fuchsin (AF) were 54.92 mg/g (Fe-MOFs) , 636.31 mg/g (Ni-MOFs) , and 79.30 mg/g (Ni/Fe(1:1)MOFs) , respectively. The adsorption kinetics followed a pseudo-second-order model, and the adsorption isotherms conformed to the Langmuir model, while Fe-MOFs and Ni/Fe(1:1) MOFs also exhibited compatibility with the Freundlich model. The adsorption mechanism primarily involved monolayer adsorption as the dominant process, with localized multilayer adsorption, as well as chemisorption, hydrogen bonding, hydroxyl interactions, and electrostatic interactions. These MOFs demonstrated high dye removal efficiency in actual water samples and fruit and vegetable juices, exhibiting excellent reusability and anti-interference capabilities. Importantly, compared with the single system, Fe-MOFs and Ni/Fe(1:1)MOFs exhibit competitive adsorption, and Ni-MOFs exhibit synergistic adsorption in the binary system. This study confirms that by adjusting the Ni/Fe molar ratio, MOFs with high selectivity and adsorption performance for different dyes can be designed, providing new theoretical insights and technical support for environmental remediation and food safety applications.
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Nature Communications
·
2025
·Vol. 16
·期 1
·1-16
·
IF 15.7
Wang Ran,Qi Yilin,Liu Jinjin,Li Yang,An Hongde,Wang Heping,Song Jie,Hu Wenzhuo,Wu Shaochun,Yu Leqian,Chen Yao,Xue Xue
Embryonic stem cells (ESC) are pluripotent, with the potential to differentiate into multiple cell types, making them a valuable tool for regenerative medicine and disease therapy. However, common culture methods face challenges, including strict operating procedures and high costs. Currently, Leukemia inhibitory factor (LIF), an indispensable bioactive protein for ESC culture, is typically applied to maintain self-renewal and pluripotency, but its instability and high cost limit its effectiveness in stable culture conditions. Hence, we have developed an innovative strategy using a soluble nanomaterial, metal-organic polyhedra (MOPs), to effectively maintain the self-renewal and pluripotency of ESC. The selected amino-modified vanadium-based MOP not only exhibits excellent biocompatibility and high stability but also possesses similar or even superior biological functions compared to commercial LIF. Due to the precise structure of MOPs, the active site responsible for maintaining ESC pluripotency has been identified and regulated at the molecular level. The new ESC culture method significantly reduces costs, simplifies preparation, and enhances the practicality of biopharmaceutical preparation and storage. This represents the first case of using MOPs to maintain self-renewal of ECS, opening an avenue for introducing advanced materials into the development of innovative ESC culture methods.
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PubMed
高影响因子
MRS Communications
·
2025
·
IF 2.3
Tan Jing Er,Liu Shengnan,Bai Jun,Yu Bingbing,Chen Kuntao,Sheng Xing,Yin Lan
Wet-adhesive hydrogels hold significant promise for biomedical applications, yet achieving long-term adhesion remains a major challenge in biodegradable systems. Here, we present a biodegradable hydrogel incorporating a water-absorbent layer to regulate swelling behavior and water content. Comprising a poly(ethylene glycol) diacrylate (PEGDA)–gelatin matrix with a starch-based absorbent layer, the hydrogel exhibits high wet adhesion energy, elevated burst pressure, effective in vivo hemostasis, and mechanical compatibility with soft tissue. This water-absorbent strategy provides a new avenue for achieving sustained and stable wet tissue adhesion in biodegradable hydrogel systems. Graphical abstract
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高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-12
·
IF 15.7
Zhang Nan,Hu Yang,Zhang Zhuang,Wu Chao,Zhu Jiamin,Zhang Yuqing,Shen Wei,Wu Shanshan,Xi Shibo,An Li,Xi Pinxian,Yan Chun-Hua
Transition metal sulfides (TMSs) are promising catalysts for water oxidation due to their unique electronic properties, but their application is limited by structural instability during the oxygen evolution reaction (OER). The specific mechanisms by which crystallinity variations in TMSs influence their structural evolution and catalytic performance remain poorly understood. Here, we investigate the structural evolution of CoS 2 catalysts with varying crystallinities and their effect on the OER. In-situ characterization and density functional theory (DFT) calculations reveal that lower crystallinity enables rapid equilibrium among surface sulfur-oxygen exchange, metal site activation, and oxygen intermediate evolution, enhancing the transformation of bulk phase into small amounts of sulfur-stabilized oxyhydroxide and improving OER performance. Conversely, moderate crystallinity leads to self-corrosion and progressive structure collapse from the exterior inward, resulting in deactivation. This work highlights the potential of crystallinity control in optimizing the electronic states and catalytic behavior of water oxidation catalysts.
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JOURNAL OF FLUORESCENCE
·
2025
·
IF 3.1
Liu Lu,Zhang Anlin,Sun Huapeng,Lei Yanhua,Deng Bin
To address the insufficient color performance in contemporary solid-state lighting, a novel series of orange-red-emitting KSr 6 ScSi 4 O 16 :Sm 3+ (KSSSO: Sm 3+ ) phosphors was synthesized employing conventional solid-state synthesis. Comprehensive characterization encompassing phase analysis, luminescence properties, and thermal behavior was performed on the temperature-optimized material. Under 402 nm excitation, the Sm 3+ -activated phosphors exhibit four distinct emission bands centered at 562 nm, 599 nm, 645 nm, and 708 nm, corresponding to the characteristic 4 G 5/2 → 6 H 5/2 , 4 G 5/2 → 6 H 7/2 , 4 G 5/2 → 6 H 9/2 , and 4 G 5/2 → 6 H 11/2 transitions of Sm 3+ ions, respectively. Notably, the 599 nm emission ( 4 G 5/2 → 6 H 7/2 transition) dominates the luminescence spectrum, resulting in an orange-red emission color for the phosphor. The ideal Sm 3+ concentration was determined to be 2 mol%, exceeding this level induces concentration quenching primarily via dipole-dipole interactions. All synthesized samples demonstrate exceptional color purity exceeding 98%. The phosphor exhibits the remarkable property of very low thermal quenching, demonstrating exceptional thermal stability with a retention intensity of 99.58% even at an elevated temperature of 420 K. A phosphor-converted white light-emitting diode (pc-WLED) was fabricated via a tri-color blending approach, demonstrating an ideal correlated color temperature (CCT) of 5638 K and an excellent color rendering index ( R a = 92.8). These outstanding photometric properties confirm the exceptional suitability of the phosphor for high-performance WLEDs.
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高影响因子
RARE METALS
·
2025
·
IF 11
Gu Jia-Min,Kim Hyunmin,Zhao Ju-Zheng,Wang Yu-Qi,Zhao Yun-Xia,Ye Cai-Chao,Bu Yun-Fei
Advancing clean energy technologies demands efficient and durable electrode catalysts for solid oxide cells (SOCs). Despite their exceptional catalytic properties, Pt-based materials face critical challenges in high-temperature applications owing to particle agglomeration and cost constraints. Here, we demonstrate a rational design strategy utilizing controlled in situ exsolution to create strongly anchored PtSn nanoalloys on oxygen-deficient PrBaMn 1.8 Pt 0.1 Sn 0.1 O 5+ δ (L-PBMPtSn) perovskite oxide. Through precise compositional engineering and structural control, we achieved a uniform dispersion of PtSn nanoparticles with unique socket-like interfaces that prevent agglomeration while maintaining high catalytic accessibility. The optimized electrode demonstrates remarkable bifunctional performance, achieving a current density of 1.6 A cm −2 at 1.8 V for CO 2 electrolysis and a maximum power density of 316 mW cm −2 for fuel cell operation at 800 °C. More significantly, the electrode exhibits exceptional stability with only 9.6% performance degradation over 100 h of operation, which is a substantial improvement over conventional electrodes. Our findings establish a new paradigm for designing high-performance SOC electrodes through the controlled exsolution of precious metal alloys, offering broader implications for catalyst design in high-temperature electrochemical systems. Graphical abstract
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2025
·Vol. 131
·期 6
·1-7
·
IF 2.8
Yuan Lifang,Wang Junzhong,Huang Zhijin,Shen Kaixiang
Long afterglow phosphors have garnered significant attention for their ability to emit light long after excitation ceases. Afterglow emission relies on metastable trap levels within the bandgap of the host materials. Effective trap engineering strategies to optimize traps are critical in determining the afterglow performance. In this study, we investigate the codoping of Bi 3+ and Er 3+ into LiTaO 3 to enhance afterglow performance. Through high-temperature solid-state synthesis, a series of LiTaO 3 :x%Bi 3+ , y%Er 3+ (x = 0 or 0.5%, y = 0.1–4.0%) samples were prepared successfully. Structural characterization confirmed the successful incorporation of Bi 3+ and Er 3+ into the Li⁺ sites without disrupting the host lattice. Photoluminescence studies revealed that Bi³⁺ codoping significantly enhances the green emission of Er³⁺, with optimal performance achieved at 1.0% Er 3+ doping. Thermoluminescence (TL) analysis demonstrated the presence of traps with the depth of 0.748 eV, enabling prolonged afterglow emission at room temperature. The afterglow mechanism involves charge carrier storage in traps under UV excitation, followed by thermal release and recombination at luminescent centers, facilitated by energy transfer from Bi 3+ to Er 3+ . This work provides a strategy for designing a long afterglow phosphor through controlled codoping, offering insights into trap engineering and energy transfer processes in perovskite-based luminescent materials.
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