POLYMER TESTING
·
2021
·
IF 4.282
Haochuan Luo
An effective method to prepare crosslinked polybenzimidazole (PBI) via [2 + 3] Huisgen cycloadditions has been proposed. Propargyl modified PBI (PBI-PG) has been synthesized firstly. In the presence of diazido crosslinkers, PBI-PG can be thermally crosslinked by [2 + 3] Huisgen cycloadditions. Evidences from 1 H NMR and ATR spectra imply a small amount of grafting alkenyl structures on PBI-PG. The grafting alkenyl structures provide another crosslinking mechanism named as alkyne-alkene crosslink. The alkyne-alkene crosslink is highly efficient under heat to form crosslinking networks which display toughness, low tensile strengths, and large swelling ratios in phosphoric acid (PA) solutions. Influences of rigidities and chain lengths of crosslinkers on performances of crosslinked PBIs have been investigated. PBIs crosslinked by rigid crosslinkers behave as brittle materials while that crosslinked by flexible crosslinkers behave as tough materials. Addition of crosslinkers leads to decreased gel fractions but improved tensile strengths, which is attributed to competition results of crosslinking and plasticizing effects. PBI-R2-20, which is crosslinked by a long rigid crosslinker, exhibits the highest tensile strength of 102.33 MPa, which is 66.34 MPa higher than that of PBI-PG. With even lower PA uptakes, PBIs crosslinked by rigid crosslinkers display more thermally stable and higher conductivities than that crosslinked by flexible crosslinkers. After doping in 12 mol/L PA solution, PBI-R2-20, with an acid uptake of 163 wt%, displays the highest tensile strength of 8.1 MPa and the most thermally stable and the highest conductivity which reaches a maximum of 2.30 × 10 −2 S cm −1 at 188 °C among all crosslinked membranes.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2021
·Vol. 104
·期 6
·2721-2729
·
IF 3.784
Xianju Zhou,Jie Zhang,Lingni Chen,Yanhong Li,Guotao Xiang,Sha Jiang,Li Li,Xiao Tang,Zhongmin Cao,Guangxin Xie
A series of novel red emission phosphors Sr 3 Lu 1- x (VO 4 ) 3 : x Eu 3+ ( x = 0.007, 0.009, 0.02, 0.04, 0.06) were synthesized successfully by traditional high-temperature solid-state reaction. The results of X-ray diffraction (XRD) reveal the doped Eu 3+ ions have replaced the lattice sites of Lu 3+ ions. The diffuse reflectance spectra illustrate the energy gap of Sr 3 Lu(VO 4 ) 3 host is 3.61 eV. The room-temperature steady-state fluorescence spectra show that these phosphors can be effectively pumped by the charge-transfer band (CTB) of the host in near ultraviolet (NUV) spectral region and then produce strong and pure red emission at 615 nm originated from 5 D 0 → 7 F 2 electric dipole transition of Eu 3+ . The Commission Internationale de L’Eclairage (CIE) coordinates of Sr 3 Lu 0.96 (VO 4 ) 3 :0.04Eu 3+ are (x = 0.65, y = 0.35), which are very close to the red standard of National Television Standards Committee NTSC (0.67, 0.33). The fabricated warm white-light-emitting diodes (LED) demonstrate high color-rendering index Ra as 93. The results imply the red-emitting Sr 3 Lu(VO 4 ) 3 :Eu 3+ phosphors could be potentially utilized in the fields of solid-state lighting.
研究领域:
材料科学
·
光学工程
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DOI
高影响因子
Frontiers in Chemistry
·
2023
·
IF 5.5
Sun Lixia,Hu Jiayan,Bai Weiqi,Mao Wutao,Song Zhongcheng
The hunt for a higher power storage, relatively inexpensive, non-polluting battery technology is currently a pressing issue because of the rapid growth of the worldwide economic and the progressively significant environmental pollution. Among the possible nanomaterials for rechargeable batteries that can have heteroatoms applied to it in order to improve its electrochemical behavior is LixTiy(PO4)3. Carbon-coated Mn-doped Li2Mn0.1Ti1.9(PO4)3 materials was synthesized by spray drying method. The material was characterized by XRD, SEM, TEM, BET, TGA et al. Crystal data refinement results by Rietveld method showed that the symmetry space group is Pbcn.The lattice parameters of Li2Mn0.1Ti1.9(PO4)3 are a = 11.9372 Å, b = 8.5409 Å, c = 8.5979 Å, α = β = γ = 90°, V = 876.59 Å3 and Z = 4). Rietveld refinement was performed, and the confidence factors are Rwp = 11.79%, Rp = 9.14%, and χ2 = 1.425. It was exhibited that LMTP0.1/CA-700 material has good crystallinity. Testing the cells with LAND test procedure (200 mA/g current density for 200 cycles), the LMTP0.1/CA-700 material has a discharge specific capacity of about 65 mAh/g. The capacity decayed by only 3% during the cycle. It has some potential application values as cathode of lithium ion battery in the future.
研究领域:
材料科学
·
电化学
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DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 7
·6760-6767
·
IF 2.195
Bao Runxi,Li Mingyu,Shen Meng,Liu Huan,Zhang Guangzu,Zeng Yike,Jiang Shenglin
Ceramic-polymer pyroelectric composite materials with favorable flexibility hold great potential for wearable sensors and energy harvesters, and the further improvement in pyroelectric properties would push them closer to practical application. In this work, an uniaxial stretching method was proposed to optimize the performance of lead zirconate titanate nanowires (PZT NWs)/polyvinylidene fluoride (PVDF) 1–3 composites. With just one stretching treatment, the pyroelectric coefficient of the composite was enhanced by inducing more β phase in PVDF matrix, and the permittivity was decreased by reorientation of PZT NWs to the strain direction in the meantime. As a result of the incorporated effects, the figure of merit of the stretched composite with orientated PZT NWs increases to the value of 2.18 × 10 −10 C cm −2 K −1 , which is 619% higher than that of untreated samples at 35 °C. This work could provide an efficient approach to fabricate high-performance ceramic-polymer pyroelectric composite materials.
研究领域:
材料科学
·
能源技术
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DOI
高影响因子
Crystals
·
2022
·Vol. 12
·期 10
·1425
·
IF 2.67
Zijie Xiao,Tingting Tao,Jingting Shu,Wei Dang,Shusheng Pan,Wei Zhang
Studying the carrier recombination process in MAPb(Br1−yIy)3single crystals (SCs) is important for its application in the optoelectronic field. In this work, a series of MAPb(Br1−yIy)3SCs with varied Br/I compositions have been studied. Steady-state photoluminescence (PL) spectra, time-resolved photoluminescence (TRPL) spectra and time-resolved microwave photoconductivity (TRMC) were used to understand the radiative and non-radiative recombination processes of MAPb(Br1−yIy)3SCs. By comparing the dynamics of TRPL and TRMC, we conclude that the dynamics of TRPL is dominated by the electron trapping process, which is in accordance with the fast decay component of TRMC kinetics, whereas the slower decay component in TRMC is dominated by the hole trapping process. Moreover, we find both the electron and hole trapping rates in mixed-halide perovskite MAPb(Br1−yIy)3(0 < y < 1) SCs are higher than that of mono-halide perovskite MAPbBr3SCs and MAPbI3SCs. This suggests mixed-halide crystals could introduce additional electron and hole trapping densities, which could be related to the fluctuation of Br/I compositions in the crystals. This work is helpful for understanding carrier recombination process in mixed-halide perovskite SCs.
研究领域:
材料科学
·
光学
·
半导体物理
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DOI
高影响因子
TOXICOLOGY AND APPLIED PHARMACOLOGY
·
2026
·
IF 3.6
Shangxiang Feng,Kun Song,Hao Zhang,Zhuoqun Wang,Yuchi Zhao,Zhongyuan Zhao,Chao Wan
This study investigated the effects of Aureusidin on extracellular matrix (ECM) degradation and pyroptosis of chondrocytes in osteoarthritis. Network pharmacology, molecular docking, and pull-down assays were initially conducted to explore the target of Aureusidin. Subsequently, Sprague-Dawley rats underwent anterior cruciate ligament transection (ACLT) received oral administration of Aureusidin. Cartilage damage was evaluated histopathologically by H&E and Safranin O-fast green staining. Primary rat chondrocytes were treated with Aureusidin under IL-1β stimulation. Pyroptotic morphology was observed under light microscopy. Propidium iodide staining and flow cytometry were conducted to evaluate membrane rupture. The expression of markers associated with ECM degradation and pyroptosis was analyzed by qRT-PCR, Western blot, immunohistochemistry, and ELISA. Caspase-3 was identified as a target for Aureusidin. Aureusidin (5, 10, 20 mg/kg) alleviated ACLT-induced cartilage damage and ECM degradation. It reduced the OARSI score and serum levels of CTX-II and COMP, while upregulating the expression of Col2a1 and Acan , and downregulating Adamts5 , Mmp13 , and Mmp3 . Aureusidin also mitigated atypical pyroptosis, evidenced by inhibited expression of GSDME-N, Caspase-3, and Cleaved-Caspase-3, and decreased levels of IL-1β and IL-18. In IL-1β-stimulated primary chondrocytes, Aureusidin (5, 10, 20 μM) attenuated ECM degradation and Caspase-3/GSDME-mediated pyroptosis. Treating chondrocytes with the Caspase-3 inhibitor Z -DEVD-FMK under IL-1β-stimulated conditions alleviated ECM degradation and pyroptosis, but the additional application of Aureusidin did not provide further inhibition. Aureusidin has the potential to inhibit ECM degradation and Caspase-3/GSDME-mediated chondrocyte pyroptosis during osteoarthritis progression. Its therapeutic effects are dependent on binding to and modulating the Caspase-3.
✓ 已验证
DOI
PubMed
高影响因子
RUSSIAN JOURNAL OF GENERAL CHEMISTRY
·
2025
·Vol. 95
·期 10
·2966-2979
·
IF 0.8
Li D. H.,Hou L. M.,Lin Q.,Lin Y.,Ma Y. K.,Bu M.
Lupeol is a natural pentacyclic triterpenoid with a wide range of biological activities. In view of its good biological activity base, to further enhance the anti-tumor activity, the researchers designed and synthesized 15 lupeol-3-indazole derivatives. All synthesized compounds were tested for their in vitro antiproliferative activity by MTT against the human lung cancer cell line (A549), human liver cancer cell line (HepG2), and human breast cancer cell line (MCF-7). Structure–activity relationship (SAR) analysis indicated that lupeol-4-[(5-bromo-1 H -indazol-3-yl)methyl]piperazine-1-carboxylate exhibited the most potent antiproliferative activity against MCF-7 cells (IC 50 = 4.53 μM), which was 13.69-fold higher than that of parent lupeol (IC 50 = 61.89 μM). In vitro anticancer mechanisms reveal that lupeol-4-[(5-bromo-1 H -indazol-3-yl)methyl]piperazine-1-carboxylate increased intracellular reactive oxygen species (ROS) levels, reduced mitochondrial membrane potential, and modulated the expression of apoptotic proteins in a dose-dependent manner, thereby inducing apoptosis in MCF-7 cells. Collectively, these findings demonstrated that the introduction of an indazole substituent at the C 3 position of lupeol significantly enhanced the anticancer activity of the compound, thereby laying a theoretical foundation for the development of novel triterpenoid-based anticancer agents.
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DOI
高影响因子
POLYHEDRON
·
2025
·
IF 2.6
Runqing Liu,Yuntian Zhao,Jiming Huang,Shibo Guan,Senling Leng
A new mixed rare-earth metal borate, Cd 3 Sc(BO 3 ) 3 was synthesized via a high-temperature solution method. Single-crystal X-ray diffraction reveals that it crystallizes in the trigonal space group R 3 ¯ (No. 148) with lattice parameters a = 11.5902(19) Å, c = 9.4230(14) Å, and Z = 6. The structure exhibits 1D ∞ [ScB 6 O 18 ] chains comprised of Sc-centered O octahedra and BO 3 triangles, and Cd atoms located in the space to balance charge. The synthesis, single crystal growth, thermal behavior, IR, Raman and UV–vis-NIR diffuse reflectance spectrums, luminescent property of the title compound have been characterized and analyzed. First-principles simulations for Cd 3 Sc(BO 3 ) 3 have been employed to rationalize the correlations between the molecular structure and optical properties.
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产品关联
DOI
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
LingYan Liu,ChunHong Zhang,ShuangRong Chen,Lan Ma,YingMei Li,YiFeng Lu
La(OH) 3 -modified canna biochar (CBC-La) was prepared by a coprecipitation method (dipping method), and its phosphate adsorption characteristics were investigated. The results show that the pseudo-second-order kinetics and the Langmuir model can be used to describe the adsorption process with a high level of accuracy. Adsorption equilibrium could be reached at 8 h, at which point the maximum adsorption capacity was shown to be 37.37 mg/g. CBC-La has excellent phosphate adsorption capacity in the middle to low concentrations (≤50 mg/L), and its removal rate can exceed 99 %. CBC-La also has wide pH adaptability (3–9) and a strongly selective adsorption performance. Notably, it can still maintain a removal rate of over 99.8 % in the presence of certain anions (NO 3 − , HCO 3 − , and CO 3 2− ), and the presence of NH 4 + has a synergistic effect on the adsorption process. Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) measurements demonstrate that the main mechanisms of CBC-La phosphate adsorption are electrostatic adsorption, ion exchange, ligand exchange and inner sphere complexation.
研究领域:
环境科学
·
材料科学
·
水处理
·
吸附技术
·
生物炭改性
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DOI
高影响因子
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2024
·Vol. 27
·期 9
·e202300707
·
IF 2.2
Xiaomeng Cheng,Chengxiang Lv,Shufang Zhang,Mingcui Ding,Bingying Pan
We report the magnetic and optical properties of Fe 2 (HPO 3 ) 3 ⋅ 4H 2 O. By combined magnetic susceptibility and specific heat measurements, we find two antiferromagnetic (AFM) transitions ( T N1 =9 K, T N2 =5 K) which originate from the AFM exchange interactions mediated by the (HPO 3 ) 2− anions. Compared with the non-hydrated compound Fe 2 (HPO 3 ) 3 , the magnetic interaction strength and ordering temperature of Fe 2 (HPO 3 ) 3 ⋅ 4H 2 O are both reduced by a factor of ~2. Through density functional theory (DFT) analysis we find almost degenerate AFM states in Fe 2 (HPO 3 ) 3 ⋅ 4H 2 O which are close in energy. The competition of these AFM states might lead to the two successive AFM phase transitions at low temperature. The low ordering temperature as well as competing AFM states both imply frustrated magnetism in Fe 2 (HPO 3 ) 3 ⋅ 4H 2 O, probably originating from the complex competing AFM interactions. The optical properties of Fe 2 (HPO 3 ) 3 ⋅ 4H 2 O are also investigated by photoluminescence and infrared spectroscopies. Graphical By combined magnetic susceptibility and specific heat measurements, we find two successive antiferromagnetic (AFM) transitions at ~9 K and ~5 K in Fe 2 (HPO 3 ) 3 ⋅ 4H 2 O. Through density functional theory (DFT) analysis we have calculated the AFM states. Two AFM configurations, namely AFM I and AFM II, are almost degenerate in energy and their competition leads to the two successive AFM phase transitions at low temperature, reflecting the frustrated magnetism in Fe 2 (HPO 3 ) 3 ⋅ 4H 2 O.
研究领域:
凝聚态物理
·
磁性与磁性材料
·
无机化学
·
强关联电子体系
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DOI
高影响因子
Acta Crystallographica Section C-Structural Chemistry
·
2014
·Vol. 70
·期 11
·1050-1053
·
IF 0.535
Li X.,Wang Z.-G.,Chen H.-H.,Liu S.-G.
The title compound, C18H28O3, was prepared by the reaction of 2,6-di-tert-butylphenol with methyl acrylate under basic conditions using dimethyl sulfoxide as the promoter. The structure of this antioxidant indicates significant strain between the ortho tert-butyl substituents and the phenolic OH group. In spite of the steric crowding of the OH group, it participates in intermolecular hydrogen bonding with the ester carbonyl O atom.
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2016
·
IF 3.782
Jin Han,Maowen Xu,Yubin Niu,Min Jia,Ting Liu,Chang Ming Li
A novel cubic KTi 2 (PO 4 ) 3 is successfully synthesized via a facile hydrothermal method combined with a subsequent annealing treatment and further used as electrode material for sodium-ion batteries for the first time. For comparison, carbon-coated KTi 2 (PO 4 ) 3 obtained by a normal cane sugar-assisted method reveals superior electrochemical performances in sodium-ion battery. Besides of the high coulombic efficiency of nearly 100% after 100 cycles, a stable capacity of 112 mA h g −1 can be achieved at 0.5 C after 100 cycles, and still maintains to 105 mA h g −1 after 500 cycles with capacity retention of approximately 90%.
研究领域:
材料科学
·
电化学
·
储能
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）