SYNTHESIS-STUTTGART
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2025
·Vol. 57
·期 16
·2490-2495
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IF 2.3
Lin-Gen Zhang,Wen Yuan,Shunsheng Yan,Ke Cao
An efficient and environmentally friendly protocol for the synthesis of 1-(α-hydroxyindole)-o-carboranes has been developed via Friedel–Crafts reaction of C3-H of indoles with 1-formyl-o-carborane in the absence of Lewis acid and solvent. The intermolecular σ-π interaction between indole and B–H bonds of o-carborane was proposed for promoting the Friedel–Crafts reaction of the C3-H of indole.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Guoxuan Xu,Ketao Hu,Rui Zhou,Ruizhe Xing,Jie Kong
This work introduces a novel digital light processing (DLP) printable SiBCN(O) ceramic precursor (UV-hPBSZ), derived through a straightforward aminolysis approach. The unique hyperbranched molecular structure of UV-hPBSZ leads to remarkable UV curing efficiency, excellent printability, satisfied ceramic yield, and consistent shrinkage ratio. UV-hPBSZ also exhibits superior resistance against cracking and collapse during the polymer-to-ceramic process, thus enabling the fabrication of intricate SiBCN(O) ceramic structures. Upon pyrolysis at 1200 °C, the resulting SiBCN(O) ceramic demonstrates outstanding electromagnetic wave (EMW) absorption performance, achieving full coverage in the X band ( R L min = -36.68 dB). To showcase the design flexibility, a distinctive metastructure is proposed and successfully fabricated using DLP printing technique. This SiBCN(O) metastructure absorber enables impressive EMW absorption in the Ku band (94.6 % coverage), attributed to surface resonance effects and multiple internal reflections. Moreover, SiBCN(O) ceramics exhibit excellent high-temperature stability, with less than a 1.63 % total mass change from room temperature to 1400 °C. UV-hPBSZ offers a simple but versatile way to control dielectric properties, which opens up new possibilities for multifunctional integrated EMW absorbers suitable for both ambient and high-temperature conditions.
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Journal of Energy Storage
·
2023
·
IF 9.4
Tingting Dai,Xuesong Li,Liying Wang,Xijia Yang,Yang Gao,Qixian Zhang,Wei Lü
Ni-Co-O material is the most representative polymetallic compound and has exhibited excellent energy storage properties. However, the high cost of composite restricts the practical application of Ni-Co-O material. In this paper, a simple and low-cost method is used to grow Ni-Co-O/C nanoarrays directly on a conductive matrix. The results show that the three-dimensional nanoflower-like Ni-Co-O/C composite has better electrochemical performance than that of the nanosheet Co-O/C binary composite. This microstructure provides a shorter path for electron transport, making the material high electron transport efficiency. The specific capacitance of Ni-Co-O/C/AC asymmetric supercapacitor can reach 128.75 mF cm −2 at 2 mA cm −2 . Under the condition of 20 mA cm −2 , after 4000 cycles of charge and discharge, the capacitance retention rate is maintained at 99.8 %. This 3D flower-like structure not only helps provide an open framework and rapid ion diffusion, but also exposes more active sites and enhances charge storage performance. Ni-Co-O/C calcined in nitrogen shows more abundant defect structure and larger specific surface area, which is further conducive to Ni-Co-O/C electrodes to expose more active sites and enhance the rapid diffusion and reaction of electrolyte ions .
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Catalysis Science & Technology
·
2019
·Vol. 9
·期 11
·2915-2922
·
IF 5.726
Qing Zhang,Jinhao Zhang,Huawei Yang,Yilin Dong,Yu Liu,Lixia Yang,Donglei Wei,Wenxiang Wang,Liangjiu Bai,Hou Chen
In this work, CoMo bimetallic oxides were prepared and proposed as catalysts for aerobic oxidative desulfurization (AODS) of fuels with oxygen in air as the oxidant. The bimetallic oxides could efficiently catalyze the oxidation of a series of thiophenic compounds at 80–120 °C and atmospheric pressure, while the neat Co or Mo oxide didn't show any catalytic ability, which directly proved the synergistic effect of Co and Mo. In the bimetallic system, the Co(II) sites could exhibit the capability to activate oxygen, while the Mo(IV) sites were suspected to directly participate in the oxidation of sulfides by forming reactive species. As is clearly evidenced by the characterization and experimental results, with the variation of Co/Mo proportion (2 : 1, 1 : 1 and 1 : 2), the bimetallic oxides possessed different electronic structures and surface compositions, which further led to their distinct catalytic performances. When the Co/Mo ratio was 2 : 1, the best performance was obtained, and some important reaction parameters were investigated. Furthermore, the catalyst could be reused for at least five cycles without changes in catalytic performance and chemical structure. Based on these results, it is expected that the CoMo bimetallic oxides may serve as an efficient, separable and recyclable catalyst for AODS of fuels.
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RSC Advances
·
2021
·Vol. 11
·期 29
·17611-17621
·
IF 3.361
Yanfei Liu,Shuo Long,Shanshan Zhang,Yifu Tan,Ting Wang,Yuwei Wu,Ting Jiang,Xiaoqin Liu,Dongming Peng,Zhenbao Liu
Although berberine (BBR) shows antioxidant activity, its activity is limited. We synthesized 9-O-benzoic acid berberine derivatives, and their antioxidant activities were screened via ABTS, DPPH, HOSC and FRAP assays. The para-position was modified with halogen elements on the benzoic acid ring, which led to an enhanced antioxidant activity and the substituent on the ortho-position was found to be better than the meta-position. Compounds 8p, 8c, 8d, 8i, 8j, 8l, and especially 8p showed significantly higher antioxidant activities, which could be attributed to the electronic donating groups. All the berberine derivatives possessed proper lipophilicities. In conclusion, compound 8p is a promising antioxidant candidate with remarkable elevated antioxidant activity and moderate lipophilicity.
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PubMed
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PLANT PHYSIOLOGY AND BIOCHEMISTRY
·
2021
·
IF 4.27
Xuqiu He,Ronghao Huang,Lipeng Liu,Yingying Li,Wenzhao Wang,Qingshan Xu,Youben Yu,Tianshan Zhou
Anthocyanins are a group of natural water-soluble pigments in plants that contribute to the pink-purple color of a range of tissues. Because anthocyanins have various biological activities in human health, there is great research interest in the development of anthocyanin-rich foods and beverages, including purple shoot tea. Anthocyanidin 3- O -galactosides have been identified as one of the main anthocyanin components in purple shoot tea, but the enzyme responsible for their biosynthesis remains unclear. UDP-galactose anthocyanidin 3- O -galactosyltransferase (UA3GalT) is presumed to catalyze the galactosylation of anthocyanidin. Therefore, we assayed the UA3GalT activity in five tea samples with varying degrees of purple color and found that its activity was strongly positively correlated (r = 0.929, p < 0.05) with anthocyanin content. Phylogenetic analysis and sequence alignment suggested that CsUGT78A15 encoded a UA3GalT enzyme. Enzymatic assays indicated that r Cs UGT78A15 could catalyze the synthesis of cyanidin 3- O -galactoside and delphinidin 3- O -galactoside using UDP-galactose as a sugar donor, and it showed higher catalytic efficiency towards delphinidin than cyanidin. These results indicate that Cs UGT78A15 acts as a UA3GalT in vitro . Subcellular localization showed that Cs UGT78A15 was located in the endoplasmic reticulum (ER) and nucleus, consistent with the location of anthocyanin synthesis. Transient overexpression of CsUGT78A15 in the fruit of mature ‘Granny Smith’ apples showed that the upregulation of CsUGT78A15 promoted cyanidin 3- O -galactoside accumulation in apple skins. These results suggested that Cs UGT78A15 could catalyze galactosylation of anthocyanidins in planta . Our findings provide insight into the biosynthesis of anthocyanins in tea plants .
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PubMed
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2021
·
IF 7.267
Pan Zhang,Yuanyuan Cui,Yongji Yao,Wei Wei,Yuanyuan Sun,Kaiqiang Zhang,Yanfeng Gao
Developing cheap and efficient materials for enhancing the photochromic performance upon visible or solar light irradiation is a hot-topic in the field of solar energy conversion . However, few inorganic photochromic materials can provide satisfying applications due to their low coloring and bleaching efficiency as well as slight color change. Here, we synthesized the bismuth tungstate (Bi 2 WO 6 ) ultrathin nanosheets with the thickness of 1.29 nm via co-precipitation-hydrothermal method using cetyltrimethylammonium bromide (CTAB) surfactant . The prepared ultrathin nanosheets show the similar crystalline structure but a narrowed band gap of 2.73 eV, as compared with the 2.86 eV of pristine Bi 2 WO 6 . Additionally, the numerous [WO 6–x Br 2x ] species and abundant “Bi–O″ vacancy pairs on the surface can serve as active sites that suppress the recombination of photogenerated electron-hole pairs and capture the photogenerated electrons to form the color trapping centers. As a result, Bi 2 WO 6 ultrathin nanosheets exhibit excellent photochromic behavior upon solar light irradiation (coloring time of 5 s) and under dark atmospheric treatment (bleaching time of 35 min) compared with WO 3 -based photochromic materials (coloring time of 20–60 min and bleaching time of 3 h days).
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JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Shishi Yang,Qinliang Jiang,Kaisong Zhang
Advanced membranes with high water flux, excellent salt selectivity as well as superior fouling resistance are highly demanded in water desalination and water treatment. Herein, a new nanocomposite nanofiltration (NF) membrane was reported by introducing the two-dimensional (2D) oxidized molybdenum disulfide (O–MoS 2 ) into the polyamide selective layer. O–MoS 2 with high hydrophilicity and strong electronegativity was synthesized by the oxidation and exfoliation process. The nanocomposite membrane was successfully prepared through interfacial polymerization with the incorporation of O–MoS 2 into organic phase. O–MoS 2 was successfully embedded in the membranes as visualized by SEM and TEM characterizations. The hydrophilicity and electronegativity of the nanocomposite membranes were improved. Compared with the pristine membrane, the performance of the membrane was best when the concentration of O–MoS 2 was 0.010 wt/v%. Consequently, the Na 2 SO 4 rejection increased to 97.9%, and the water flux was 2.5 times higher. In addition, the membrane displayed excellent antifouling properties. The results showed that O–MoS 2 as an excellent 2D modifier would bring more breakthrough improvements in the field of membrane separation .
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Micro & Nano Letters
·
2019
·Vol. 14
·期 13
·1340-1343
·
IF 0.975
Zijun He,Huanfeng Tang,Zaiyin Huang
Four different sizes of cuprous oxides (Cu 2 O) nanocubes in the range of 40–120 nm were synthesised by liquid phase reduction method. The morphology, size, and structure of synthesised Cu 2 O nanocubes were characterised by scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. In-situ microcalorimetry was used to calculate the conventional and surface thermodynamic functions of Cu 2 O nanocubes by combining thermodynamic principles and transition state theory. The effect of particle size on conventional thermodynamic functions and surface thermodynamic functions were investigated and analysed, whose results were supported by the established thermodynamic models. Results showed that both the standard molar enthalpy of formation and the standard molar entropy of formation were increased with decreasing particle size, while the standard molar Gibbs energy of formation decreased. Also, the molar surface Gibbs energy, molar surface enthalpy, and molar surface entropy grew with the reduction of particle size, which correlated well with the models. Such a property is of scientific significance for enriching and developing disciplines such as surface physics and surface thermodynamics.
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APPLIED CATALYSIS A-GENERAL
·
2012
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IF 3.903
Manhong Liu,Xinxin Mo,Yanyan Liu,Hailian Xiao,Yu Zhang,Jieying Jing,Vicki L. Colvin,William W. Yu
Colloidal platinum nanoparticles with 2.2 nm were immobilized on γ-iron oxide (γ-Fe 2 O 3 ) powder to make a supported catalyst (Pt/γ-Fe 2 O 3 ) with controlled Pt nanoparticle size and size distribution. This catalyst was used to catalyze the selective hydrogenation of o -chlorobenzene to o -chloroaniline without using any solvent; 99.9% selectivity at 99.95% conversion was achieved.
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TETRAHEDRON
·
2015
·
IF 2.641
Biquan Xiong,Kui Zeng,Shanshan Zhang,Yongbo Zhou,Chak-Tong Au,Shuang-Feng Yin
A novel copper-catalyzed method for the direct esterification of P(O)–OH compounds using phenols as efficient esterification reagents is illustrated. It is a simple way to generate a broad spectrum of functionalized O -aryl phosphinates , phosphonates , and phosphates from basic starting materials with moderate to excellent yields.
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SENSORS AND ACTUATORS B-CHEMICAL
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2015
·
IF 4.097
Jing-Hui Zhu,Meng-Meng Li,Shao-Pu Liu,Zhong-Fang Liu,Yuan-Fang Li,Xiao-Li Hu
Carbon dots (CDs) with a fluorescence quantum yield of approximately 2.41% were prepared by simple one-step hydro-thermal synthesis of triethylenetetramine-N, N, N′, N″, N‴, N‴-hexaacetic acid (TTHA). The obtained CDs possess excitation wavelength-dependent and pH insensitive photoluminescence (PL) properties. Notably, the as-prepared CDs also exhibited unique auramine O (AO)-stimulus-responsive dual-emission fluorescence individuality, with which detection of AO using CDs has been performed through a fluorescence resonance energy transfer process. The fluorescence signals are linearly correlated with the concentration of AO over a range of 0.18–16.0 μM ( R 2 = 0.9989), with a limit of detection (3 σ ) of 54 nM. Additionally, a keypad lock and a NOR–AND logic gate was designed as well.
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危险品化学品经营许可证（带存储）