CHINESE JOURNAL OF POLYMER SCIENCE
·
2022
·Vol. 40
·期 3
·310-320
·
IF 3.815
Duan Zheng-Yu,Wang Yan-Yan,Pan Qi-Wei,Xie Yun-Feng,Chen Zhi-Yong
Microporous organic polymers with high surface area are widely used in many applications. Among them, hypercrosslinked polymers have been extensively concerned because of their simple processes and low-cost reagents. However, due to most state-of-the-art strategies for HCPs based on condensation reactions, the release of small molecules such as hydrochloric acid and methanol involved in such strategies brings about new hazards to environment. Herein, we propose a method of fabrication of hypercrosslinked polymers via self-addition polymerization of divinyl benzene and its crosslinking with polar aromatic molecules. The hypercrosslinked polyDVB-based products are demonstrated by Friedel-Crafts addition reaction of double bonds on DVB that can connect adjacent phenyl rings of aromatic molecules to form the crosslinked networks. The HCPDVB-CB obtained in 1-chlorobutane as solvent has a high micropore content and displays high surface area up to 931 m 2 /g. Following this finding, DVB is used as a novel external crosslinker for knitting polar aromatic molecules. When L-phenylalanine and bisphenol A are used as the aromatic units, the obtained HCP(Phe-DVB) and HCP(BPA-DVB) could reach surface area of 612 and 471 m 2 /g, and have hydrogen uptake of 0.62 wt% and 0.58 wt% at 77 K and 1.13 bar by comparison with HCPDVB-CB having hydrogen uptake of 0.30 wt%, respectively.
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高影响因子
Advanced Fiber Materials
·
2022
·Vol. 4
·期 4
·774-785
·
IF 12.958
Wu Zihe,Yang Jiehui,Shao Wenjie,Cheng Menghao,Luo Xianglin,Zhou Mi,Li Shuang,Ma Tian,Cheng Chong,Zhao Changsheng
Developing efficient and durable non-noble metal-based oxygen evolution catalysts is of great importance for electrochemical water splitting. Here, we report a new and facile strategy for controllable synthesis of high-valence Mo modified FeNiV oxides as efficient OER catalysts. The Mo-dopant displays a significant influence on the valence state of Fe species in the catalysts, which lead to tunable OER performance. When the feed ratio of Mo-dopant is 5%, the Mo-modified FeNiV oxide shows the best OER performance in terms of low overpotential (237 mV at the current density of 10 mA cm −2 ), Tafel slope (38 mV per decade), and high mass activity, which exceeds its counterparts and most reported OER catalysts. Furthermore, by assembling the catalyst with a carbon fiber cloth, the fabricated water-splitting device exhibits excellent activity and long-term durability in alkaline electrolyte compared with commercial catalysts equipped device. This work not only provides a series of Mo-modified FeNiV-based oxides as high-performance OER catalysts but also offers a new pathway to tune the charge states of OER active centers. Graphical abstract
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高影响因子
IONICS
·
2022
·Vol. 28
·期 5
·2203-2211
·
IF 2.961
Xie Xiaohua,Tian Suyun,Guo Wentao,Wang Dejia,Wang Ting,Zhang Jian,Xia Baojia
Due to the high theoretical specific capacity, silicon materials have been developed worldwide to meet the requirement of energy storage in lithium ion batteries. But the low conductivity and large volume expansion (300%) of Si usually cause poor cycling stability during charge/discharge processes. Here, a novel approach to fabricating a porous micro-structure of graphene wrapping silicon nanoparticles and polyaniline skeleton is proposed. The polyaniline skeleton grafted silicon nanoparticles is obtained by an in situ polymerization and the graphene sheets further wrap on the skeleton owing to an enhancement of π conjugation between the polyaniline and graphene. Thus, a 3D conductive and porous micro-structure is synthesized, which not only facilitates the electron and lithium ion transfer but also enhances the stability of structure during the volume expansion of Si. Benefiting from the advantages of structure, the electrode can deliver a reversible specific capacity of 2473 mAh g −1 at 0.2 A g −1 and 958 mAh g −1 at 10 A g −1 . The electrode can keep a stable cycling with a capacity retention of 70% and 60% for 100 and 200 cycles at 25 °C, respectively. The method provides a promising strategy for solving the issues of silicon in lithium ion batteries.
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高影响因子
MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 3
·1-8
·
IF 6.408
Wu Jinmei,Lu Qi,Fu Xiao,Xu Huajian,Wan Pingping,Fu Huimin,Ding Jiqiang,Zhang Jing,Mei Qingsong
A novel nanoassembly was constructed through encapsulating upconversion nanoparticles (UCNPs) into a metal–organic framework structure (ZIF-8), in which doxorubicin (DOX) was absorbed into pores of ZIF-8. The blue emission of UCNPs was quenched by DOX through the fluorescence resonance energy transfer (FRET) strategy. When the nanoprobe was exposed to food samples with different pH values, ZIF-8 collapsed to release DOX molecules, resulting in upconversion recovery. The porous structure of ZIF-8 provides abundant space for DOX absorption, which significantly improves the detection capacities and accuracy. It is shown that the probe has a good linear relationship when pH values vary from 2.5 to 7.4, and can distinguish pH variations as low as 0.5 in real samples. This strategy has been successfully used to determine food spoilage by determination of pH variations. Graphical abstract
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PubMed
高影响因子
Journal of Coatings Technology and Research
·
2022
·Vol. 19
·期 3
·907-917
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IF 2.339
Su Qiuping,Tang Zilun,He Jiajian,Gu Yuxin,Li Yong,Xie Jing,Wang Shaoshun,Lin Ruijun,Lin Xiaofeng,Lin Wenjing,Yi Guobin
In this work, tris(oxiran-2-ylmethyl) benzene-1,3,5-tricarboxylate (TOTC) was synthesized by a new two-step method without using harmful epichlorohydrin and served as a curing agent for polyester powder coatings. The chemical structure of TOTC was determined by Fourier transform infrared spectroscopy and nuclear magnetic resonance spectroscopy. The curing behavior and the curing reaction kinetics of TOTC/polyester resin (NH-3307) system were studied by dynamic differential scanning calorimetry. The activation energy E a was 71.75 kJ mol -1 according to Flynn–Wall–Ozawa method, and the curing reaction of TOTC/NH-3307 system was described by Friedman method. It was found that the curing reaction of TOTC/NH-3307 system was a two-parameter autocatalysis which followed the Šestάk–Berggren model. The nonisothermal curing reaction rate was simulated according to the Šestάk–Berggren model and the experimentally parameters. What is more, the thermogravimetric analysis results showed that the TOTC/NH-3307 system had good thermal stability with an initial decomposition temperature of 374.92°C. The TOTC/NH-3307 cured film exhibited excellent leveling performance by SEM. The results demonstrated that TOTC has efficient curing ability and huge market potential.
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高影响因子
JOURNAL OF PHYSIOLOGY AND BIOCHEMISTRY
·
2022
·Vol. 78
·期 2
·377-388
·
IF 5.08
Zhu Shenglong,Zhang Jingwei,Wang Wei,Jiang Xuan,Chen Yong Q.
Nonalcoholic fatty liver disease (NAFLD) is a chronic liver disease with an increasing global prevalence associated with tremendous clinical, economic, and health-related quality-of-life burden. Currently, no effective pharmacological therapy is available for NAFLD. Adipogenesis process is accompanied by fat synthesis which may participate in the occurrence and development of NAFLD. Despite intensive investigations, numerous mechanistic aspects of adipogenesis remain unclear and many potential therapeutic targets are yet to be discovered. In this study, the transcriptomics and lipidomics approaches were used to explore the functional genes regulating adipogenesis and the potential mechanism in OP9 cells and adipose-derived stem cells. We find that NADH:ubiquinone oxidoreductase subunit b9 ( Ndufb9 ) is up-regulated in adipogenesis ( p < 0.001), and silencing Ndufb9 (83% silencing efficiency) inhibits adipogenesis. The effect of Ndufb9 is mediated through stearoyl-CoA desaturase 1 ( Scd1 ). Aramchol, a SCD1 inhibitor, significantly blocks adipogenesis (markedly TG decrease, p < 0.001). Our study broadens the understanding of the role of Ndufb9 in adipogenesis and provides a new target for the treatment of NAFLD.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 10
·5825-5838
·
IF 4.682
Zhou Jichun,Xu Wei
This experiment aims to optimize the interface compatibility between the wood template and the resin through silane coupling agent KH550, so as to improve the optical and mechanical properties of transparent wood with solid wood color and texture, and provide a theoretical basis for the application of new materials in the fields of home design and manufacturing. In this study, silane coupling agent was used to directly modify the wood templates from which partial lignin was removed, and then, epoxy resin E57 matched with the refractive index of the wood templates was introduced, and samples were obtained after impregnation and curing. Then, the orthogonal experiment method was used to explore the process conditions used when the optical performance of the samples reached the optimal (the transmittance was 87.5%, and the haze was 35.39% at 800 nm wavelength): KH550 concentration 5 wt%, 20 min, 25 °C. And the order of the influence of various factors on the light transmittance of the samples was: reaction temperature > reaction time > KH550 concentration. Then, through infrared test, X-ray diffraction patterns and electron microscopy, it was concluded that KH550 made more chemical bonds between the wood template and the resin, so the overall interface compatibility of the sample became better. Therefore, the light transmittance, tensile strength and elongation at break of the samples modified by KH550 were significantly improved, and the haze was significantly reduced. In addition, transparent wood still retains part texture of solid wood, which is also the feature of this new material. Graphical abstract
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 9
·6576-6591
·
IF 2.779
Wu Jinxiu,Wang Xin,Jia Huiling,Liu Zhaogang,Niu Xiaochao
Fluorescent nano-probes have great potential applications for diagnostics and therapy. In this work, the microwave-assisted Stöber method was used for the surface modification of the spherical nano-phosphor YPO 4 :2%Sm 3+ to solve the problems of hydrophilicity and biocompatibility of spherical fluorescent nano-material YPO 4 :Sm 3+ . Their structural, morphology and optical properties were determined using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectra, TG–DTA curve and fluorescence spectrophotometry. And the adsorption of YPO 4 :2%Sm 3+ @SiO 2 to bovine serum albumin was studied by the static isothermal adsorption method. Results indicated that YPO 4 :2%Sm 3+ @SiO 2 was uniformly monodisperse core–shell nano-sphere with an average diameter of 60–90 nm. The crystal structure and morphology of the phosphor YPO 4 :Sm 3+ was not changed after the surface modification, the thickness of the coating layer was approximately 10–20 nm and the fluorescence intensity and lifetime of the modified product were reduced. The adsorption of YPO 4 :2%Sm 3+ @SiO 2 to protein was the mono-molecular layer adsorption, the adsorption formula was Y = 0.0051 X −0.0000037 and the maximum adsorption amount q = 198.89 mg/g. This study successfully solved the problems of hydrophilicity and biocompatibility of spherical nano-phosphor YPO 4 :2%Sm 3+ .
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高影响因子
Science China-Chemistry
·
2022
·Vol. 65
·期 5
·943-953
·
IF 10.138
Yan Yi-Teng,Wu Gang,Chen Si-Chong,Wang Yu-Zhong
The closed-loop recycling concept of the polymer wastes into building-block chemicals is attractive, but the closed-loop recycling of copolymers enabled by energy-efficient chemical recycling and cost-effective separations is still facing great challenges. Herein, for the first time, a one-pot sequential copolymerization of γ -butyrolactone ( γ -BL) and p -dioxanone (PDO) using an economical ureas/alkoxides catalytic system is conducted to synthesize biodegradable and chemically recyclable poly-( γ -butyrolactone)-block-poly( p -dioxanone) (P γ BL- b -PPDO) diblock copolymers with well-defined and controlled structures. The composition-dependent properties of P γ BL- b -PPDO copolymers, including thermal properties and crystallization behavior, are investigated. The results show that the thermal stability and crystalline ability of P γ BL are enhanced observably by introducing the PPDO block. Significantly, the P γ BL- b -PPDO copolymers can be depolymerized efficiently into the corresponding co-monomers with a yield of over 95% by simply low-temperature pyrolysis under vacuum. Moreover, γ -BL and PDO monomers are selectively separated with an isolated purity of about 99% based on the difference in their physicochemical properties. Subsequently, their repolymerization is realized to obtain the copolymers with nearly identical structures and thermostability, demonstrating the closed-loop recycling of copolymers, i.e. , polymerization-depolymerization-repolymerization. This research provides important guidance for the design of novel sustainable polymers towards more efficient chemical recycling, separation and regeneration.
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高影响因子
MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 3
·1-10
·
IF 6.408
Chen Shengyu,Li Suping,Liu Xiaofeng,Shi Bingfang,Huang Yijun,Zhao Shulin
A near-infrared nitrogen and sulfur co-doped carbon dot (N,S-CD)-based ratiometric fluorescent probe is proposed that is synthesized via hydrothermal approach using glutathione and formamide as precursor for sensing and imaging of Zn 2+ . The prepared N,S-CDs facilitate binding with Zn 2+ owing to N and S atom doping. The ratio (I 650 /I 680 ) of fluorescence intensity at 650 nm and 680 nm increased with the concentrations of Zn 2+ when the excitation wavelength was 415 nm. The linearity range was 0.01 to 1.0 μM Zn 2+ with a detection limit of 5.0 nM Zn 2+ . The proposed probe was applied to label-free monitoring of Zn 2+ in real samples and fluorescent imaging of Zn 2+ in living cells, which confirmed its promising applications. Graphical abstract
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高影响因子
POLYMER BULLETIN
·
2022
·Vol. 80
·期 1
·495-514
·
IF 2.843
Chen Xiuqiong,Zhu Qingmei,Liu Zhaowen,Zhang Tong,Gong Cuiyu,Li Juan,Yan Huiqiong,Lin Qiang
To change the strong hydrophilicity of alginate and make it have good amphiphilic property, thereby broadening its application as a new pesticide-controlled release system, the hexyl alginate ester derivative (HAED) was synthesized by the bimolecular nucleophilic substitution (S N 2) reaction, using 1-bromohexane as the hydrophobic modifier. The structure and self-aggregate performance of the synthesized HAED were contrastively characterized. Moreover, the loading and release performance of λ-Cyhalothrin (LCH) for the HAED microcapsules prepared by the high-speed shearing method was also studied. The synthesized HAED exhibited enhanced molecular flexibility and good self-aggregate performance, which could form the stable self-aggregated spherical micelles with the average hydrodynamic diameter and zeta potential of 416 nm (PDI = 0.29) and − 39.9 mV, respectively, due to the intra- or intermolecular hydrophobic associations. Furthermore, the obtained HAED microcapsules displayed the high encapsulation efficiency and sustained-release property in comparison with the SA microcapsules for the good affinity of HAED to hydrophobic LCH that retarded the drug diffusion. On the basis of the excellent advantages of HAED, it was expected to become the ideal candidate for hydrophobic drug delivery in controlled-release pesticide formulations.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 6
·4311-4322
·
IF 4.682
Chen Jiepeng,Luo Chen,Huang Yun,Liu Jiapin,Li Chengwei,Zhao Zhixing,Xu Xi,Zheng He,Tang Zhaomin,Li Xing,Wang Mingshan,Lin Yuanhua,Cao Haijun
Most gel polymer electrolytes (GPEs) for sodium-ion batteries developed at present have some problems, such as limited absorption uptake of liquid electrolyte (LE) and low ionic conductivity of corresponding GPEs caused by the difficulty of transporting sodium ions with large radius. In view of these problems, hydroxypropyl methyl cellulose (HPMC) is used as raw material to prepare high-performance HPMC-based GPE (HPMC-GPE). When HPMC membrane is added to the LE containing NaClO 4 and propylene carbonate (PC) will lead to the ring-opening polymerization of PC, and the products of ring-opening polymerization of PC will be grafted into HPMC side chain. This destroys the dense structure of HPMC membrane and enhances the affinity of HPMC membrane to LE, and then, a large amount of LE (up to 1796 wt.%) can be stored in the molecular chain of HPMC. With the thermal movement of HPMC molecular chain, the volume of HPMC molecular increases significantly in 3D space, providing a large free volume and fast migration channel for sodium ions conduction. The experimental results show that the ionic conductivity of HPMC-GPE is 3.3 × 10 –3 S cm −1 and has an electrochemical stability window of 4.72 V. SIB assembled with SnS/rGO working electrode, sodium metal counter electrode and HPMC-GPE has good rate performance and cycle stability.
Graphical Abstract
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高影响因子
危险品化学品经营许可证（带存储）