TETRAHEDRON-ASYMMETRY
·
2014
·Vol. 25
·期 23
·1520-1526
·
IF 2.165
Yong-Ming Sun,Zhong-Yuan Xu,Li-Juan Liu,Fan-Jie Meng,He Zhang,Bao-Ci Fu,Li-Jun Sun,Mei-Ju Niu,Shu-Wen Gong,Chang-Qiu Zhao,Li-Biao Han
The hydrophosphorylation of aldehydes with a P -stereogenic H -phosphinate was realized by heating two compounds in a neat state or catalyzed by a base , to afford P -retention α-hydroxyl phosphinates. The ( S P , S C ) and other diastereomers were isolated, and their structures were confirmed by NMR spectroscopy and crystallography.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Hang Che,Yuhao Wu,Xinhua Wang,Haizhen Liu,Mi Yan
The Mg(NH 2 ) 2 -2LiH system is considered as one of the most potential hydrogen storage materials due to its high hydrogen storage capacity (5.6 wt%) and excellent reversible hydrogen adsorption and desorption performance. However, its poor kinetic characteristics of hydrogen absorption and desorption limit its practical application. In this work, Li 3 VO 4 @LiVO 2 was synthesized by a hydrothermal method , and was then introduced into Mg(NH 2 ) 2 -2LiH system to enhance the hydrogen absorption and desorption kinetic characteristics. The results show that the hydrogen storage properties were greatly improved with addition of 10 wt% Li 3 VO 4 @LiVO 2 addition. As for the hydrogen absorption and desorption kinetics, the average hydrogen absorption rate of 10 wt% Li 3 VO 4 @LiVO 2 modified Li-Mg-N-H sample within 20 min at 200 ℃ increased by 95.2% compared with that of the pristine Li-Mg-N-H sample, and the average hydrogen desorption rate of 10 wt% Li 3 VO 4 @LiVO 2 modified sample within 30 min at 180 ℃ increased by 42% compared with that of the pristine sample. The E a of hydrogen desorption decreased from 117.86 kJ/mol to 99.43 kJ/mol, which also indicates that Li 3 VO 4 @LiVO 2 catalyst effectively improved the kinetic performance of hydrogen desorption and desorption of Li-Mg-N-H. Moreover, the hydrogen desorption capacity and hydrogen absorption capacity of 10 wt% Li 3 VO 4 @LiVO 2 modified Li-Mg-N-H increased by 18.4% and 13.8% compared with that of the pristine sample. The catalytic mechanism of Li 3 VO 4 @LiVO 2 was discussed based on XRD , XPS and FTIR analysis results.
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CHINESE JOURNAL OF POLYMER SCIENCE
·
2017
·Vol. 36
·期 3
·406-416
·
IF 1.692
Bai Yang,Xie Fang-Yuan,Tian Wei
Despite the fact that some progress has been made in the self-assembly of H-shaped polymers, the corresponding self-assemblies that respond to external stimulus and are further utilized to adjust the release of drugs are still deficient. The stimuli-responsive segments with amphiphilic H-shaped structure are generally expected to enhance the controllability of self-assembly process. The synthesis and self-assembly behavior of thermo-responsive amphiphilic H-shaped polymers with poly(ethylene glycol) (PEG), polytetrahydrofuran (PTHF) and poly(N-isopropyl acrylamide) (PNIPAM) as building blocks are reported in this paper. The inner architecture structure and size of complex micelles formed by H-shaped self-assemblies were effectively adjusted when the solution temperature was increased above the lower critical solution temperature of PNIPAM segments. Furthermore, it was found that the architecture of self-assemblies underwent a transition from the complex micelles based on primary micelles with hybrid PEG/PNIPAM shells to large complex micelles based on primary micelles with hybrid PTHF/PNIPAM cores and PEG shells during the thermal-induced self-assembly process. The adjustable release rate of doxorubicin (DOX) from the DOX-loaded complex micelles and basic cell experiments further proved the feasibility of these self-assemblies as the thermal-responsive drug delivery system.
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JOURNAL OF ORGANOMETALLIC CHEMISTRY
·
2024
·
IF 2.1
Chao-Chao Teng,Yan Guo,Ke Cao,Han-Bo Yang,Qi-Jia Jiang,Dao-Yong Zhu,Shao-Hua Wang
A palladium catalyzed selective arylation of B(4)-H of 9-amide- o -carborane with potassium aryltrifluoroborate has been developed. A series of B(4)-Ar-B(9)-amide- o -carborane derivatives decorated with diverse active groups have been synthesized with moderate to good yields as well as excellent selectivity. This work represents an unprecedented protocol for selective arylation of o -carboranes with potassium aryltrifluoroborates.
研究领域:
有机化学
·
金属有机化学
·
药物化学
·
材料科学
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JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2024
·Vol. 149
·期 23
·13759-13771
·
IF 3
Li Wenjie,Long Jiangfeng,Liu Sijia,Wang Peng,Xu Linglin,Lai Yong
To assess the feasibility of using C-S–H seeds to boost the anti-mechanical vibration capabilities of concrete, this work evaluated the mechanical properties, hydration kinetics, phase assemblage of hydrates, and pore structure of Portland cement (PC) and slag cement mortars, at varying dosages of C-S–H seeds. Results reveal that the incorporation of C-S–H seeds negatively affects the vibration resistance of neat PC, while it effectively enhances the vibration resistance of slag cement. The addition of these seeds facilitates cement hydration and improves the early mechanical properties, which is evident in the shortened appearance time of the hydration exothermic peak by almost 50%. The remarkable vibration resistance observed in slag cement primarily stems from the synergistic effect between C-S–H seeds and slag. However, the premature formation of the internal microstructure in neat PC due to C-S–H seeds disrupts the stability of mutual construction between hydration products. The findings indicate that C-S–H seeds can be used in engineering to enhance concrete lifespan, reduce road repair expenses, and enhance construction efficiency.
研究领域:
土木工程
·
建筑材料
·
胶凝材料
·
混凝土技术
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FUEL
·
2026
·
IF 7.5
Xue Ma,Xianjie Wang,Jinhui He,Jingdong Gou,Yaning Zhao,Akang Liu,Shuo Feng,Louwei Cui,Huiyong Chen,Jun Yang,Liuyi Pan,Dong Li
The similarity in physical and chemical properties between ethylcyclohexane (ECH) and dimethylcyclohexane (DCH) isomers poses significant challenges for the effective separation of ECH from coal-derived C8 naphthenic oil. This study employed a model oil system comprising the three predominant components in C8 naphthenic oil: ECH, Cis-1,3-DCH, and Trans-1,3-DCH. The separation performance of H-beta zeolites with varying silica-aluminum ratios (SAR) was evaluated through static adsorption and dynamic breakthrough experiments. The results indicated that H-beta-55 (SAR = 55) demonstrated superior separation efficiency for ECH, attributable to its hierarchical microporous-mesoporous structure and moderate acidity. Specifically, H-beta-55 achieved an ECH/1,3-DCH selectivity coefficient of 3.7, an ECH adsorption capacity of 7.1 mg/g, and a pseudo-second-order adsorption rate constant of 0.67 g/(mg·min), which was 3.4–4.8 times higher than those observed for the 1,3-DCH isomers. In dynamic breakthrough tests, the ECH breakthrough endpoint (∼350 min) occurred approximately 150 min later than that of Cis-1,3-DCH (∼200 min). Ethylcyclohexane temperature-programmed desorption (ECH-TPD) experiments confirmed that physical interactions predominantly governed adsorption. Grand Canonical Monte Carlo (GCMC) simulations of molecular probability density distributions revealed that ECH (kinetic diameter ∼ 6.37 Å) preferentially accesses secondary pore channels to occupy high-density adsorption sites. In contrast, steric hindrance caused by the methyl groups of DCH isomers restricted them to the primary 12-membered ring main channels. These findings underscore the importance of fine-tuning the SAR of H-beta zeolites to optimize pore size distribution and acidity for efficient C8 naphthene separation. This work provides a molecular-level theoretical basis for designing advanced adsorbents for industrial-grade naphthenic oil separation processes.
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RARE METALS
·
2014
·Vol. 33
·期 1
·86-90
·
IF 0.806
Zhu Xi-Lin,Han Shu-Min,Zhao Xin,Li Yuan,Liu Bao-Zhong
Hydrogen storage properties of 2LiNH 2 –MgH 2 – x NbH ( x = 0 and 0.05) composites and the catalysis of NbH on hydrogen sorption reaction of the Li–Mg–N–H system were investigated. Hydrogen sorption properties of 2LiNH 2 –MgH 2 system are effectively improved by adding NbH. Temperature programmed desorption results show the addition of NbH reduces the dehydriding onset temperature of 2LiNH 2 –MgH 2 system by 21 K. Approximate 3.62 wt% hydrogen in 2LiNH 2 –MgH 2 –0.05NbH composite is released following a 500 min at 433 K, whereas the amount of hydrogen desorption is only ~3.16 wt% for the pristine system under the same condition. The sample with NbH exhibits higher dehydriding rate compared with the pristine one. Moreover, hydrogen absorption rate increases by adding NbH into the 2LiNH 2 –MgH 2 system. Hydrogen absorption capacity of the samples with NbH is 3.23 wt% within 400 min, which is higher than that of pristine sample. Fine NbH particles homogeneously distribute in the 2LiNH 2 –MgH 2 –0.05NbH composite, and catalyze the hydrogen sorption reaction rather than reacts as a reactant into new compound.
研究领域:
材料科学
·
氢能
·
固态化学
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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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PubMed
高影响因子
INORGANIC CHEMISTRY
·
2026
·
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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高影响因子
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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