Open Ceramics
·
2026
·
IF 3.4
Xingpu Hu,Zhaoran Li,Guoqi Liu,Fan Qian,Mao Chen,Yongqiang Chen
Side seal plates for thin-strip continuous casting require exceptional resistance to thermal shock, corrosion and wear, for which h-BN based ceramics serve as promising candidates. However, h-BN-ZrO 2 -SiC composites suffer from poor sintering densification. h-BN-ZrO 2 -SiC composites modified with varying amounts of B 2 O 3 as a single additive were prepared via vacuum hot-press sintering at 1550 °C, 1600 °C and 1650 °C. The phase composition, microstructure, relative density, flexural strength and thermal shock resistance were systematically investigated. The composite with 1 wt% B 2 O 3 sintered at 1650 °C achieved a flexural strength of 76.6 MPa, which was 42% higher than that of the additive‑free sample. The results revealed that B 2 O 3 facilitates the in-situ formation of ZrB 2 via a liquid‑phase sintering mechanism. This work clarified the modification mechanism of B 2 O 3 in h-BN-based composites, providing experimental basis and theoretical guidance for the development of h‑BN‑based ceramics used for side dams in thin‑strip continuous casting.
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ACS Nano
·
2026
·
IF 17.3
Dongfang Shen,Yumeng Zhou,Ru Li,Shengkai Xia,Lingshuo Meng,Liang Zhang,Mingjia Zhang
The memtransistor constructed using the emerging two-dimensional tellurene material has demonstrated significant potential for application in artificial synaptic devices and image recognition. However, conventional device fabrication processes, such as dry transfer, restrict tellurene’s further application in flexibility and wearable electronics. Here, a fully printed, flexible tellurene field-effect transistor (FET) is demonstrated, consisting of a channel, gate dielectric layer, and contact electrodes, all of which are prepared using functional inks that include tellurene, h-BN, and graphene, respectively. Such a device integrates scalable ink formulations and neuromorphic functionality for advanced electronics, exhibiting relatively stable electrical performance even after 10,000 bending cycles at a curvature radius of 11.05 mm. Applying electric stimulation to the h-BN layer enables the realization of a bioinspired memtransistor, achieving paired-pulse facilitation, reconfigurable short-term plasticity to long-term plasticity transitions, and synaptic weight updates. Moreover, image recognition simulation using an artificial neural network achieves 93.91% accuracy on the Modified National Institute of Standards and Technology database, which can maintain 78.33% accuracy after introducing σ = 0.7 Gaussian noise. These results position printed tellurene FETs as promising, noise-resilient building blocks for scalable, flexible neuromorphic systems.
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INORGANIC CHEMISTRY
·
2026
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IF 4.6
Wei Bao,Ming-Yang Shi,Pei-Zheng Liu,Hao Du,Zheng-Xuan Ni,Lin-Na Tian,Jia-Jia Zhao,Chao Shi,Li-Zhuang Chen
Molecular ferroelectric materials exhibit structural tunability and high flexibility, demonstrating significant potential in flexible electronics and wearable sensing applications. Herein, we use nonpolar piperidinium tetrafluoroborate PipBF4 (1, Pip+ = piperidine) as the precursor. We designed and synthesized an organic–inorganic hybrid ferroelectric, (4,4-DFPD)BF4 (2, 4,4-DFPD+ = 4,4-difluoropiperidinium), via H/F substitution strategy. Single-crystal structural analysis indicates that the introduction of fluorine atoms successfully induces symmetry breaking in the crystal structure, causing it to crystallize at room temperature in the ferroelectric space group Pca21. At the Curie temperature, the (4,4-DFPD)BF4 transitions from an ordered ferroelectric state to a disordered paraelectric state. This (4,4-DFPD)BF4 exhibits a phase transition temperature (Tc = 398 K), spontaneous polarization, and piezoelectric properties (d33 ≈ 28 pC/N). Based on the piezoelectric properties of (4,4-DFPD)BF4, we fabricated flexible composite films of (4,4-DFPD)BF4/PBAT PBAT = poly(butylene adipate-co-terephthalate). These films achieve mechanical-to-electrical energy conversion without additional polarization treatment, delivering an output voltage up to 4 V at the optimal composition. This flexible sensor can stably monitor various physiological signals ranging from large-scale human joint movements to minute vocal cord vibrations. It exhibits high durability, exceeding 2000 cycles.
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JOURNAL OF ORGANIC CHEMISTRY
·
2025
·
IF 3.6
Huanhuan Cui,Chunyu Hu,Xiulin Qiao,Tiesheng Shi,Chao Chen,Wei Wei,Zu-Li Wang,Zhuoming Ma
An efficient visible-light-induced EDA strategy has been developed for constructing 3-difluoroalkylated quinoxalin-2(1H)-ones through the C–H difluoroalkylation of quinoxalin-2(1H)-ones with fluoroalkyl bromides. This transformation could provide a series of 3-difluoroalkylated quinoxalin-2(1H)-ones in moderate to good yields under mild and metal-free conditions. Mechanistic studies revealed that the formation of the EDA complex between fluoroalkyl bromide and TMEDA was essential to initiate this transformation.
研究领域:
有机化学
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药物化学
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光氧化还原催化
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2026
·Vol. 46
·期 16
·118638
·
IF 6.3
Xueqi Gu,Xinyue Hu,Daheng Wu,Xian-Zong Wang,Jianxi Liu,Hong Yu,Cheng-Feng Du,Long Wang,Jun Yang
Yttria-stabilized zirconia (YSZ) is a promising candidate for abradable seal coatings (ASC) in aero-engines, yet its inherent high coefficient of friction (COF) limits further application. This study introduced dual solid lubricant phases consisting of graphene nanoplatelets (GNPs) and silica-coated hexagonal boron nitride (h-BN@SiO 2 ) with different mass fractions into YSZ, and their tribological performance was systematically evaluated from room temperature to 750 °C. The composite containing 15 wt% GNPs and 5 wt% h-BN@SiO 2 exhibited low and stable COF (below 0.3) and moderate wear rates. Notably, it achieved an ultra-low COF of 0.08 at 750 °C. This outstanding performance originates from the formation of a low-shear graphene/BN interlaced lamellar structure, while tribochemically formed silicate phases and molten boron oxide further enhance the overall tribological performance of the composite. This work proposes an effective design approach for the development of high-performance YSZ-based ASC materials across a broad temperature range.
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Journal of Physical Chemistry C
·
2022
·
IF 4.177
Yuemiao Lai,Zhengtian Pu,Peng Liu,Fangliang Li,Jie Zeng,Xueming Yang,Qing Guo
The low-temperature C–H bond activation of alkanes remains a big challenge in alkane dehydrogenation. In this work, ethylbenzene (EB) oxidative dehydrogenation has been investigated on rutile(R)-TiO2(110) under both ultrahigh vacuum (UHV) and ambient conditions. Under UHV conditions, styrene is produced with nearly 100% selectivity in a stepwise manner, in which the first C–H bond dissociation of EB occurs at <285 K with the help of surface O22– species, followed by the second C–H bond dissociation at about 400 K. However, styrene, acetophenone, and 2,3-diphenylbutane products are produced from EB oxidative dehydrogenation under ambient conditions, suggesting that α-H dissociation is the initial step of EB oxidative dehydrogenation. This may be also possible for EB oxidative dehydrogenation on R-TiO2(110) under UHV conditions. The different pathways of EB oxidative dehydrogenation under UHV and ambient conditions may originate from different intermediates and O2 concentrations. This work provides new insight into the fundamental understandings of the low-temperature C–H bond activation of alkyl chains of aromatic hydrocarbons, which may promote the development of new catalysts for efficient styrene production from EB oxidative dehydrogenation under mild conditions.
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JOURNAL OF DRUG DELIVERY SCIENCE AND TECHNOLOGY
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2021
·
IF 3.981
Jingxin Gou,Silin Wang,Xu Li,Tian Yin,Haibing He,Yu Zhang,Xing Tang,Wei Xiao,Zhenzhong Wang
Drug microcrystal (MC) is an important category of long acting injections (LAIs), whose release profile is controlled mainly by particle size, crystal form, drug solubility , and other parameters. In this study, a polymeric H + depot composed of alginate was combined with drug MC using ginkgolide B (GB) as model drug to reduce the initial burst release of the drugs with elevated solubility in body fluid. The parameters of GB MC preparation by precipitation, including stabilizer type and amount, phase volume ratio, and stirring rate were investigated. And the particle size/distribution, particle morphology, crystallinity, in vitro release of optimized GB MC were characterized. The in vivo dissolution retardation effect of acidified alginate (SAA) was first confirmed by live imaging using fluorescein as probe. And the pharmacokinetic profiles of different GB MC-polymer blends were investigated by UPLC-MS/MS. The prepared GB MC was spherical-like particles with a mean particle size of 5.863 μm and a span value of 1.634. The crystallinity of GB MC was lowered by the precipitation process compared with that of the crude drug , which resulted in a faster in vitro dissolution with more than 90% of drugs dissolved in 20 min. When administered with SAA, an alginate amount-dependent reduction in C max (1243.5 ± 281.4 ng/mL of GB-SAA, 1:5, 820.9 ± 84.0 ng/mL of GB-SAA, 1:10, 2850.9 ± 1059.3 ng/mL of GB alone and 2476.9 ± 396.4 ng/mL of GB-HPMC E5, 1:10) and prolongation in T max (3.2 ± 1.1 h of GB-SAA, 1:5, 6.4 ± 2.2 h of GB-SAA, 1:10, 1.2 ± 0.45 h of GB alone and 1.4 ± 0.55 h of GB-HPMC E5, 1:10) was noticed, indicating the capability of polymeric H + depot in controlling GB release in vivo . In conclusion, the polymeric H + depot strategy influenced drug dissolution and outward drug diffusion sequentially to retard the initial burst release of drugs with elevated solubility in body fluid.
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RENEWABLE ENERGY
·
2021
·
IF 8.001
Feng Lin,Yulong Ma,Yonggang Sun,Kanghe Zhao,Tingting Gao,Yingbo Zhu
Due to the inertness and structural complexity of lignin, upgrading lignin to biofuels and fine chemicals still faces great challenges. In this paper, a one-pot method was used to catalyze straw lignin with H-ZSM-5 supported by Ni and Ru bimetals, and the lignin conversion rate reached 88.1%. The yield of monophenol was 19.5%, of which the yield of 4-ethylphenol and 4-ethylguaiacol was 4.9% and 3.8%, respectively. The 2D HSQC NMR analysis confirmed that the Ni–Ru/H-ZSM-5 catalyst had an obvious activity of breaking C β -O bonds before and after the reaction. The result showed that after loading metal Ni and Ru, the Lewis acid of the catalytic system was greatly increased, which caused electron transfer between Ni and Ru. 3Ni-1.5Ru/H-ZSM-5 had the strongest activity due to the largest synergy among Ni, Ru and H-ZSM-5. The synergy was the key factor leading to the cleavage of C–C and C–O bonds in straw lignin and the high-performance catalytic degradation of lignin. Besides, the effect of reaction solvent and hydrogen resource on upgrading lignin to fine chemicals over 3Ni-1.5Ru/HZSM-5 catalyst was also intensively investigated. This research developed a method for the direct conversion of lignin into valuable monophenols.
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Marine Drugs
·
2021
·Vol. 19
·期 2
·79
·
IF 5.118
Hengju Ge,Di Zhang,Muran Shi,Xiaoyuan Lian,Zhizhen Zhang
In 2019, streptoglutarimide H (SGH) was characterized as a new glutarimide from the secondary metabolites produced by a marine-derived actinomyceteStreptomycessp. ZZ741 and shown to have in vitro antiglioma activity. However, the antiproliferative activity and potential mechanism of SGH against lung cancer cells have not yet been characterized. This study demonstrated that SGH significantly inhibited the proliferation of different lung cancer cells. In terms of mechanism of action, SGH downregulated cell cycle- and nucleotide synthesis-related proteins to block cell cycle at G0/G1 phase, reduced the expression levels of glycolytic metabolic enzymes to inhibit glycolysis, and downregulated the important cancer transcription factor c-Myc and the therapeutic target deubiquitinase USP28. Potent anticancer activity and multiple mechanisms indicated SGH to be a novel antitumor compound against lung cancer cells.Keywords:Streptoglutarimide H;lung cancer cells;antiproliferative activity;cell cycle block;glycolysis;USP28;c-Myc
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MEASUREMENT SCIENCE and TECHNOLOGY
·
2021
·Vol. 32
·期 9
·095114
·
IF 2.046
Qianchun Zhang,Yan Wang,Qin Zhou,Yafei Chen,Yuguo Zheng,Shan Tang,Yuxian Zhao,Li Jiang
Nonmetallic nanocatalysts have demonstrated powerful potential in cataluminescence (CTL) sensing fields. In this study, an original method for the fabrication of a CTL gas sensor was developed to detect acetylacetone based on nanosized hexagonal boron nitride (h-BN). The luminescence characteristics and optimum operating temperature, wavelength, and carrier gas flow rate parameters for the h-BN sensor were studied in detail. Compared with other common gases (such as cyclohexanone, acetaldehyde, and acetone), the fabricated sensor demonstrated a high selectivity and sensitivity toward acetylacetone. This was verified by density functional theory calculations, which were consistent with the experimental results. The CTL intensity and concentration of acetylacetone had a linear relationship in the range of 0.050–20 μg ml−1 (r = 0.9989) with a low detection limit of 16 ng ml−1 (S/N = 3). The developed sensor was applied to analyze spiked samples, and satisfactory recoveries for acetylacetone of 82.2%–118% were obtained with excellent reproducibility (2.8%–11%). These results indicated that the system has excellent sensing properties including a high selectivity, sensitivity, and stability, proving its broad application prospects for detecting acetylacetone.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Zhao Du,Lang Feng,Zhonglu Guo,Tongqi Yan,Qi Hu,Jing Lin,Yang Huang,Chengchun Tang,Yi Fang
Herein, a series of ultrathin h-BN/Bi 2 MoO 6 heterojunction with excellent photocatalytic activity has been firstly prepared via a feasible solvothermal method . Our results suggest that the optimized photocatalyst possesses a high degradation ratio of tetracycline (TC), oxytetracycline (OTC) and doxycycline (DC) up to 99.19%, 95.28% and 91.04% under visible-light irradiation, respectively. We highlight that the outstanding photocatalytic activity is mainly attributed to the prominent performance of tetracycline adsorption on h-BN and the dominant visible-light absorption by Bi 2 MoO 6 as well as the effective photogenerated carrier separation induced by the synergetic effect between h-BN and Bi 2 MoO 6 . Moreover, DFT calculations reveal that the built-in electric field formed between h-BN and Bi 2 MoO 6 gives rise to the separation of carriers and the polarization of tetracycline molecules. Last but not the least, the specific process and micro-mechanism of the photocatalytic tetracycline degradation under visible-light driven have also been illuminated. The present work pioneers the application of ultrathin h-BN/Bi 2 MoO 6 heterojunction as a novel tetracycline degradation photocatalyst and further guides the design of more visible-light photocatalysts.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Rongxiu Guo,Xinyue Zhang,Ze-Nan Hu,Hong Li,Jianyi Gao,Jiaping Wang,Qionglin Liang,Xiaodong Li,Dun Niu,Hong-bin Sun
Hollow metal nanoparticles have attracted great interest in heterogeneous catalysis research due to their unique structures as nanoreactors. Here, we report hollow PtCu nanoparticles encapsulated in microporous silica shells (H-PtCu@SiO 2 ), which can serve as the nanoreactor with high catalytic activity and high stability. The H-PtCu@SiO 2 nanoreactor shows the state-of-the-art catalytic performance for the transfer hydrogenation of benzonitrile to dibenzylamine, which achieves up to 100% conversion and 99% selectivity in only 0.5 h. The void-confinement effect of H-PtCu@SiO 2 is crucial for the outstanding catalytic performance by encaging the reactants in the nanoreactor. The computation demonstrates the limiting diffusion effect of the silica shell toward the ammonia borane, thus reduces the concentration of reductant species and prolongs the lifetime of the intermediate imine to improve the selectivity of secondary amine. Moreover, the silica shells can effectively enhance the catalytic stability of the H-PtCu@SiO 2 nanoreactor.
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