CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
H.L. Pan,Y.W. Zhang,H.T. Wu
Ultra low-loss Li 2 Mg 3 Ti 0.95 (Mg 1/3 Sb 2/3 ) 0.05 O 6 ceramic with a cubic rock-salt structure was prepared by the conventional solid-state reaction method. The crystal structure, sintering characteristics, microwave dielectric properties , intrinsic parameters and infrared spectrum were investigated systematically. Refined crystal structure was obtained using the Rietveld refinement method. Based on the chemical bond theory, some intrinsic parameters were calculated and Ti–O bonds played an important role in influencing microwave dielectric proprieties. According to the infrared analysis, the major polarization contribution attributed to the absorption of phonon oscillations. A few of (Mg 1/3 Sb 2/3 ) 4+ -substitutions obviously improved the microwave dielectric properties of Li 2 Mg 3 TiO 6 ceramic. Excellent microwave dielectric properties of ε r = 14.40, Q·f = 195,500 GHz and τ f = −4.02 ppm/°C were obtained for Li 2 Mg 3 Ti 0.95 (Mg 1/3 Sb 2/3 ) 0.05 O 6 ceramic sintered at 1575 °C.
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JOURNAL OF ELECTRONIC MATERIALS
·
2019
·Vol. 49
·期 1
·773-779
·
IF 1.676
Zheng Jinjie,Xu Huizhong,Yang Yaokang,Liu Lintao,Wu Haitao
Low-firing 1–4 wt.% LiF-doped Li 2 Mg 3 Ti 0.95 (Mg 1/3 Ta 2/3 ) 0.05 O 6 (LMTT) ceramics were synthesized via solid state reaction method. The effects of LiF on the phase composition, sintering behavior as well as microwave dielectric properties were systematically discussed. Adding LiF additives could lower the sintering temperature to 950°C for LMTT ceramics. X-ray powder diffraction analysis indicated that all the compounds prepared in this work have cubic symmetry with space group Fm - 3m . Typically, LMTT with 2 wt.% LiF exhibited a dense uniform microstructure and optimized microwave dielectric properties of ε r ∼ 15.1 (± 0.2), Q · f ∼ 60,100 GHz (at 8.3 GHz), and τ f ∼ − 20.45 ppm/°C at 950°C. In addition, the good chemical compatibility with Ag electrode made LMTT-2 wt.% LiF ceramic an appropriate candidate for low temperature co-fired ceramic.
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SOLID STATE IONICS
·
2022
·
IF 3.699
Xu Zhang,Jinhua Wu,Shuqian Li,Yi Li,Xiaojie Li,Zhe Zhu,Jianlong Li
The vanadium-containing phosphate polyanion LiVPO 4 F has been attractive as a novel 4 V cathode for lithium-ion batteries. Herein, a hybrid cathode containing two active components of LiVPO 4 F and Li 3 V 2 (PO 4 ) 3 was successfully obtained by single-step solid-state reaction. The crystalline grains are coated by an amorphous carbon layer of about 8 nm thick. The composite presents reversible capacities of 102.8 and 98.2 mAh g −1 at the rates of 10C and 20C, respectively. Even at an ultrahigh rate of 100C (14.5 A g −1 ), it remains a discharge capacity of 70.1 mAh g −1 with a high average working potential of 3.5 V. After cycled 500 times at 10C, the obtained sample shows a capacity retention of 78.6%, implying outstanding cycling performance. The electrochemical impendence spectroscopy demonstrates that the hybrid cathode delivers higher lithium-ion diffusion coefficient . It is believed that the electrochemical performance is enhanced synergistically by the in-situ generated ionic conductor of Li 3 V 2 (PO 4 ) 3 . Finally, when charged and discharged at around 4.1 V, the intermediate phase of Li x VPO 4 F is clearly revealed by CV tests, which likely derives from a symmetry phase transform mechanism.
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SOLID STATE IONICS
·
2017
·
IF 2.354
Zhi Zhou,Yiran Li,Mao Xia,Nan Zhou
In this paper, Li 1–x Ti 2 (PO 4 ) 3 /C composites (x = 0, 0.03, 0.05, 0.07) were synthesized by sol-gel approach, and the influence of Li vacancy on electrochemical performance of LiTi 2 (PO 4 ) 3 /C anode for aqueous rechargeable lithium battery was studied. Li vacancy hardly influences the crystal structure and morphology of the composite. Electrochemical measurement results demonstrated that Li 1–x Ti 2 (PO 4 ) 3 /C exhibited better performance compared with pristine LiTi 2 (PO 4 ) 3 /C, and Li 0.95 Ti 2 (PO 4 ) 3 /C has the best properties. Li 0.95 Ti 2 (PO 4 ) 3 /C delivered the discharge capacity of 104.3, 92.6, and 71.8 mAh g − 1 at 0.2, 5, and 20 C (1 C = 150 mA g − 1 ), 4.1, 27.3, and 34.4 mAh g − 1 larger than that of Li 0.95 Ti 2 (PO 4 ) 3 /C at corresponding rates, respectively. After 1000 cycles at 5 C, the discharge capacity retention for Li 0.95 Ti 2 (PO 4 ) 3 /C can reach 75.3%, 15.4% larger than that for LiTi 2 (PO 4 ) 3 /C. Our study reveals that Li vacancy is an efficient method to enhance the electrochemical properties of LiTi 2 (PO 4 ) 3 -based materials.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Baiwei Ma,Xuanyu Lin,Wenxin Liu,Pengjing Chen,Yanjie Wang,Ping Li,Xiaobin Lin,Lipeng Zhai,Mengyang Li
The development of efficient photocatalytic covalent organic frameworks (COFs) remains challenged by rapid charge recombination and insufficient carrier utilization. Herein, we report BC-TAPE-COF, a covalent organic framework engineered with synergistic functional compartmentalization for photocatalytic indole thiocyanation. Its tetraphenylethylene (TPE) π-bridge served dual roles: activating oxygen and enhancing interlayer charge separation, while bicarbazole as localized asymmetric electron distribution (LAED) units drove exciton dissociation through intrinsic electron density gradients. This cooperative design strategy yielded a photocatalyst with unprecedented catalytic efficiency. BC-TAPE-COF can drive the photocatalytic indole C-3 thiocyanation with ultra-low loading and maintain structural integrity over multiple catalytic cycles.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Xiaofang Liu,Jiaxin Yi,Wenya Ma,Min Fan,Qingfeng Dong,Kunpeng Qian,Li Li
The gas permeability of packaging films significantly impacts the micro-environment and postharvest quality of fruits and vegetables. By regulating gas permeability to regulate the internal atmospheric composition of packaging, this method modulates the respiratory intensity and physiological metabolism of fruits and vegetables, thereby extending their postharvest shelf life. In this study, different proportions of Poly(lactic acid) (PLA)/Poly(3-hydroxybutyrate- co -4-hydroxybutyrate) (P34HB) composite films were prepared using the melt blending method, aiming to optimize the packaging microenvironment by adjusting the gas permeability of the films. The results indicate that the oxygen transmission rate of the composite film at a PLA/P34HB ratio of 20:80 was measured at 628.65 ± 7.2 cm 3 ·m −2 ·24 h −1 ·0.1 MPa, which was 90.98 % higher than that of the PLA film. The Pearson heatmap further confirmed that the permeability of the composite film had a significant impact on the preservation effect of peaches, while the influence on mechanical properties was not significant. This finding was corroborated by preservation experiments using films of different compositions, which demonstrated that the PLA20:80P34HB composite film performed the best. Specifically, it effectively slowed the loss of free water, thereby maintaining moisture content, total soluble solids content, and weight, ultimately extending the shelf life by 66.67 %.
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PubMed
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HIGH PERFORMANCE POLYMERS
·
2023
·
IF 2.1
Jinshui Lu,Jinyuan Zhang,Heng Liu,Weipeng Chen,Jiangrong Luo,Ziqing Wang,Tingting Cui,Yonggang Min,Yidong Liu
In this work, a new diamine was designed by connecting flexible structures such as ether bond and aliphatic carbon chain between benzene rings, and was synthesized and purified through simple reactions such as Suzuki reaction. Finally, a series of polyimide (PI) films were synthesized by copolymerization with 4.4`-diaminodiphenyl ether (ODA)\pyromellitic dianhydride (PMDA) in different proportions. We prepared polyimide films with new monomer copolymerization ratios of 1% (PI-1), 5% (PI-2), 10% (PI-3), and 20% (PI-4). The polyimide films showed excellent glass transition temperatures, which were attributed to their unique bent architectures. The mechanical and thermal properties of the thermosets were studied using tensile testing, static thermomechanical analysis (TMA), and thermogravimetric analysis (TGA). As the results, the films exhibited the optimal glass transition temperatures (317.56°C–381.91°C), and the component with the highest copolymerization ratio has a 15% decrease in glass transition temperature compared to the component without copolymerization. Moreover, PI-1-PI-4 showed good heat resistance in the N2 atmosphere. The temperatures corresponding to a 5% heat loss in the films (T5%) were 458.12 °C–548.75°C, respectively.
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International Journal of Environmental Research and Public Health
·
2016
·Vol. 13
·期 9
·925
·
IF 2.035
Hong-Qin Sun,Yang Du,Zi-Yang Zhang,Wen-Jing Jiang,Yan-Min Guo,Xi-Wu Lu,Yi-Min Zhang,Li-Wei Sun
Benzophenone (BP) andN,N-diethyl-3-methylbenzamide (DEET) are two chemicals often used in personal care products (PCPs). There is a lack of systematic ecotoxicological evaluations about the two chemicals to aquatic organisms. In the present study, the acute toxic effects onChlorella vulgaris,Daphnia Magana, andBrachydanio reriowere tested and the ecotoxicological risks were evaluated. For BP, the 96-h half-maximal effective concentration (EC50) onC. vulgariswas 6.86 mg/L; the 24-h median lethal concentration (LC50) onD. maganawas 7.63 mg/L; the 96-h LC50onB. reriowas 14.73 mg/L. For DEET, those were 270.72 mg/L, 40.74 mg/L, and 109.67 mg/L, respectively. The mixture toxicity of BP and DEET, onC. vulgaris,D. magana, andB. rerioall showed an additive effect. The induced predicted no-effect concentrations (PNECs) for BP and DEET by assessment factor (AF) method are 0.003 mg/L and 0.407 mg/L, respectively. Both are lower than the concentrations detected from environment at present, verifying that BP and DEET are low-risk chemicals to the environment.
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ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
·
2017
·Vol. 643
·期 16
·1082-1087
·
IF 1.144
Chen Shen,Dajiang Mei,Chuanling Sun,Yunsheng Liu,Yuandong Wu
The selenites, Na 2 Be 3 (SeO 3 ) 4 · H 2 O and Cs 2 [Mg(H 2 O) 6 ] 3 (SeO 3 ) 4 , were synthesized under hydrothermal conditions. The crystal structures of Na 2 Be 3 (SeO 3 ) 4 · H 2 O and Cs 2 [Mg(H 2 O) 6 ] 3 (SeO 3 ) 4 were determined by single-crystal X-ray diffractions. Na 2 Be 3 (SeO 3 ) 4 · H 2 O crystallizes in the triclinic space group P 1 (no. 2) with unit cell parameters a = 4.8493(9), b = 12.013(2), c = 12.077(2) Å, and Z = 2, whereas Cs 2 [Mg(H 2 O) 6 ] 3 (SeO 3 ) 4 crystallizes in the monoclinic space group C 2/ m (no. 12) with lattice cell parameters a = 12.596(6), b = 7.297(4), c = 16.914(8) Å, and Z = 2. Na 2 Be 3 (SeO 3 ) 4 · H 2 O features a three-dimensional open framework structure formed by BeO 4 tetrahedra and SeO 3 trigonal pyramids. Na cations and H 2 O molecules are located in different tunnels. Cs 2 [Mg(H 2 O) 6 ] 3 (SeO 3 ) 4 has a structure composed of isolated [Mg(H 2 O) 6 ] octahedra and SeO 3 trigonal pyramids interacted by hydrogen bonds, and Cs cations are resided in-between. Both compounds were characterized by thermogravimetric analysis and FT-IR spectroscopy.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Cong Wang,Jieying Xiu,Kunxi Lü,Yafeng Li,Mingdeng Wei
Na super-ion conductor type material Na 3 V 2 (PO 4 ) 3 has been widely researched as the cathode of sodium-ion batteries (SIBs) in recent years, but the unsatisfying cost of Na 3 V 2 (PO 4 ) 3 impedes its wide application in SIBs. In this study, iron element is used to replace part of vanadium in Na 3 V 2 (PO 4 ) 3 to reduce its expense, and pine pollen is applied for the first time as a very effective carbon source to improve the performance of Na 4 FeV(PO 4 ) 3 . The fabricated composite material achieves a capacity of 105 mA h g −1 under 0.2 C and fascinating cycling stability over 94 % under 2 C for 500 cycles and 98 % under 10 C for 1000 cycles. The excellent cycle performance is caused by the involvement of pine pollen that acts as a carbon matrix to enhance the electron conductivity and block the agglomeration of active material effectively, thus the well-dispersed nano sized Na 4 FeV(PO 4 ) 3 shortens the diffusion path of sodium ion and gains a remarkable rate capability. Moreover, the distinguished reversibility during the charge and discharge procedures is ascribed also to the robust structure of Na 4 FeV(PO 4 ) 3 . This work provides an efficient route to realize the economic cathode material of SIBs with good performance.
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JOURNAL OF MEDICINAL CHEMISTRY
·
2024
·
IF 6.8
Wen Shuai,Huan Xiao,Panpan Yang,Yiwen Zhang,Faqian Bu,Yongya Wu,Qiu Sun,Guan Wang,Liang Ouyang
The RAS-RAF-MEK-ERK signaling cascade is abnormally activated in various tumors, playing a crucial role in mediating tumor progression. As the key component at the terminal stage of this cascade, ERK1/2 emerges as a potential antitumor target and offers a promising therapeutic strategy for tumors harboring BRAF or RAS mutations. Here, we identified 36c with a (thiophen-3-yl)aminopyrimidine scaffold as a potent ERK1/2 inhibitor through structure-guided optimization for hit 18. In preclinical studies, 36c showed powerful ERK1/2 inhibitory activities (ERK1/2 IC50 = 0.11/0.08 nM) and potent antitumor efficacy both in vitro and in vivo against triple-negative breast cancer and colorectal cancer models harboring BRAF and RAS mutations. 36c could directly inhibit ERK1/2, significantly block the phosphorylation expression of their downstream substrates p90RSK and c-Myc, and induce cell apoptosis and incomplete autophagy-related cell death. Taken together, this work provides a promising ERK1/2 lead compound for multiple tumor-treatment drug discovery.
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PubMed
高影响因子
VACUUM
·
2024
·
IF 3.8
Kaile Shi,Haodong Zheng,Yuze Sun,Honghai Wang,Jing Fang,Chunli Li,Jiapeng Liu
The utilization of 1,4-butanediol (BDO) spans across numerous sectors, underscoring its significance as a pivotal chemical. However, the separation of crude BDO still presents great challenges. Ethylene glycol (EG) and 3-methyl-1,5-pentanediol (MPD) are classical impurities in BDO crude products. In this paper, the pressure and temperature data of MPD components under high vacuum pressure were measured, and Antoine constant was obtained by fitting to supplement the basic data. The isobaric vapor-liquid equilibrium (VLE) data for the EG-BDO and BDO-MPD mixtures were experimentally measured at pressures of 1.0, 10.0, and 50.0 kPa. Meanwhile, the thermodynamic consistency of the experimental binary data was examined using the Herington area test. The experimental VLE data for binary systems were analyzed using the nonrandom two-liquid (NRTL) universal quasichemical (UNIQUAC) and Wilson activity coefficient models, demonstrating that the predicted outcomes showed excellent agreement with the measured data. Finally, the interaction energy between the components was calculated by molecular simulation to explain the gas-liquid equilibrium behavior. Therefore, this work provided guidance and basis for the separation of EG-BDO and BDO-MPD in high vacuum separation.
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