Journal of Coatings Technology and Research
·
2019
·Vol. 16
·期 3
·857-868
·
IF 1.584
Peng Mengke,Zhang Xiaodan,Xiao Xiao,Dong Mengjin,Zhao Guowei,Liu Peng,Chen Yashao,Wang Changhao
Abstract Magnesium alloy (MgA) was widely used in biomedical field owing to its good biocompatibility and degradability. The surface of MgA was usually modified to improve its corrosion resistance, biocompatibility, and biological properties. Herein, we employed a layer-by-layer assembly technique to assemble both polyanionic and polycationic electrolytes onto the microarc oxidation-treated MgA surface to yield MgA-MgO-PEI-[Ge(HANPs)/Lzm] 50 , where the gelatin-conjugated hydroxyapatite nanoparticles [Ge(HANPs)] are the polyanionic electrolyte, lysozyme (Lzm) is the polycationic electrolyte, and polyethyleneimine (PEI) is the transition layer. The morphology and chemical composition of MgA-MgO-PEI-[Ge(HANPs)/Lzm] 50 were characterized by X-ray diffraction, scanning electron microscopy, and X-ray photoelectron spectroscopy, indicating that [Ge(HANPs)/Lzm] 50 were successfully fabricated on the surface of MgA-MgO. The surface of MgA-MgO-PEI-[Ge(HANPs)/Lzm] 50 exhibited good hydrophilicity as evidenced by the low water contact angle of 24.5°. Excellent corrosion resistance of MgA-MgO-PEI-[Ge(HANPs)/Lzm] 50 was obtained since it can decrease about four orders of magnitude of corrosive current ( I corr ) compared to pristine MgA. The biological assay for MgA-MgO-PEI-[Ge(HANPs)/Lzm] 50 showed good antiplatelet adhesion and excellent antibacterial activities against both E. coli and S. aureus. Graphical abstract
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高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2022
·Vol. 48
·期 6
·2557-2573
·
IF 3.134
Liu Yueyu,Yin Zhili,Wang Ziqing,Mou Ronglin,Wei Zhong
High surface area ZrO 2 –KOH sample was prepared and used the catalyst for the synthesis of glycerol carbonate (GC) from dimethyl carbonate (DMC) and glycerol. The structure properties of ZrO 2 –KOH were characterized by XRD, BET, CO 2 -TPD, XPS, and ICP-OES. It was found that the strong basicity of ZrO 2 –KOH might be attributed to the oxygen vacancies as well as the big surface area. Experiments were developed to evaluate the effects of catalysis loading, proportion of reactants, temperature and reaction time on the conversion of glycerol to GC. The consequences showed that ZrO 2 –KOH was a highly efficient basic catalyst for synthesis of GC from glycerol. The catalytic performance of ZrO 2 –KOH is much better than that of ZrO 2 –KOH–CP, ZrO 2 –NH 4 OH, and some reported heterogeneous catalysts. And the higher performance of ZrO 2 –KOH was ascribed to the strong basicity. 99.43% conversion was obtained in a particular situation of catalyst/glycerol weight ratio of 3 wt%, DMC/glycerol molar ratio of 3:1, reaction temperature of 80 °C, and reaction time of 2 h. The plausible reaction mechanism for the transesterification on the strong basic active sites was discussed.
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高影响因子
Journal of the Iranian Chemical Society
·
2013
·Vol. 11
·期 2
·415-422
·
IF 1.467
Zou Deqing,Qing Ye,Li Yingtang,Liu Mosheng,Yang Yaling
A highly sensitive method for the determination of manganese (VII), chromium (VI) and nickel (II) in medicinal herb samples is proposed. The method is based on analytes reacted with ammonium pyrrolidinedithiocarbamate (APDC) to give hydrophobic chelates (M–APDC), which were separated and enriched by cloud-point extraction (CPE) with non-ionic surfactant Tergitol TMN-6 as extractant. The surfactant-rich phase containing the chelates is determined with a high-performance liquid chromatography system. To achieve the best CPE method, the Box–Behnken design was used to study the concentration of Tergitol TMN-6, equilibrium temperature, equilibrium time as well as their interaction. What followed was the individual research for the pH of the sample solutions and the concentration of APDC. What is more, in the given optimized experimental conditions, calibration plots were found to be linear in the range of 0.0200–0.500 mg/L for Mn (VII) and Cr (VI), meanwhile 0.0500–1.00 mg/L for Ni (II), the linear correlation coefficients were between 0.996 and 0.999, the recoveries ranged from 91.8 to 97.8 % and the relative standard deviations were between 1.09 and 2.30 % ( n = 3). The limits of detection were 0.164 μg/L for Mn (VII), 0.562 μg/L for Cr (VI) and 5.12 μg/L for Ni (II), respectively. The proposed method was applied to determine manganese (VII), chromium (VI) and nickel (II) in medicinal herb samples with satisfactory results.
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高影响因子
CELLULOSE
·
2022
·Vol. 29
·期 9
·5235-5249
·
IF 6.123
Wei Xiaoyao,Lin Tao,Du Hengli,Wang Le,Yin Xuefeng
Cellulose nanocrystal (CNC) suspensions can form chiral spiral structures because of their unique self-assembly characteristics, and their structures can be maintained in dried films. This makes CNC films possess iridescent and liquid crystal properties at the same time. However, neat CNC films are so fragile that they are not suitable for wide use. We first explored the influence of a new type of green plasticizer-deep eutectic solvent (formed by urea and choline chloride) on CNC composite films under different molar ratios and proportions. Deep eutectic solvents (DES) have attracted extensive attention in recent years due to their low cost, easy fabrication and no need for purification. Urea/choline chloride, as the original DES, can improve the apparent uniformity and smoothness of the film only by adding 1‱ of DES, maintaining the optical properties and structural stability of the CNC composite film while effectively reducing the brittleness of the film (the molar ratio of the CNC/DES film with the best performance is 2:1). When the amount of DES in the CNC aqueous suspension reaches 10‱, it will destroy the structure of the CNC, resulting in loss of the optical properties of the CNC/DES films. Different from the common small molecule plasticizers previously reported, the addition of DES not only increases the number of hydrogen bonds but also introduces charge force, which forms a network structure that synergistically improves the flexibility of CNC films. Graphical abstract
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高影响因子
MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 7
·1-7
·
IF 5.705
Wang Panpan,Cao Ling,Wu Ying,Di Junwei
Under visible-light irradiation, a cathodic photoelectrochemical (PEC) sensor is presented for highly sensitive determination of Cr(VI) at a potential of −0.25 V (vs SCE). PbS quantum dots (QDs) were capped with mercaptoacetic acid and assembled on the surface of an indium tin oxide (ITO) electrode via the linker poly(diallyl dimethyl ammonium chloride) providing a photoactive sensor. Cr(VI) accepts the photoelectrons generated by the PbS QDs. This promotes the separation of electron holes and enhances the cathodic photocurrent generated by a 470-nm LED. The sensor has 10 pM detection limit and a linear working range from 0.02 nM to 2 μM of chromate. The method was successfully applied to the determination of Cr(VI) and total chromium in spiked environmental water samples.
Schematic illustration of the photocurrent enhancement response of ITO/PbS toward chromium(VI). In the presence of Cr(VI) (red line), Cr(VI) accepts the photoelectrons generated by the PbS QDs under 470-nm LED irradiation, resulting in improved photocurrent of ITO/PbS.
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高影响因子
Advanced Composites and Hybrid Materials
·
2018
·Vol. 1
·期 3
·548-557
·
IF 0
Mao Fan,Shi Zhicheng,Wang Jing,Zhang Chao,Yang Chaoqiang,Huang Minghua
The search for high-performance dielectric materials has long been driven by the urgent needs for various modern electronics. However, enhanced permittivity is always accompanied by elevated loss, which seriously hinders the development and applications of dielectric materials. Herein, negative- k layers were introduced into layer-structured films, forming a new class of multilayer composites consisting of alternately stacked positive- k and negative- k layers. Compared with traditional multilayer composites without negative- k layers, the layered composites containing extra positive- k /negative- k interfaces exhibit superior ability in balancing the contradict parameters: permittivity and loss, yielding substantially enhanced permittivity without sacrificing the low loss. It is indicated that the permittivity was enhanced by the charge accumulations and reinforced polarizations on the interfaces between positive- k and negative- k layers. Meanwhile, the loss induced by the leakage current was suppressed by the blocked transport of carriers between adjacent layers. The trilayered 60-3.5-60 composite exhibits an enhanced dielectric constant ( ε ′ ≈ 33 @10 kHz) and retained low loss (tanδ ≈ 0.12 @10 kHz) compared with the single-layer BT/PVA composite containing 60 wt% BT fillers ( ε ′ ≈ 9.5 @10 kHz, tanδ ≈ 0.075 @10 kHz). This research offers an effective way to design and fabricate novel high-performance dielectric materials.
Improved dielectric permittivity and retained low loss were obtained in layer-structured films via adjusting interfaces.
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APOPTOSIS
·
2024
·
IF 6.1
Li Ziyao,Tian Ye,Zong Huafeng,Wang Xuelei,Li Dongyang,Keranmu Adili,Xin Shiyong,Ye Bowen,Bai Rong,Chen Weihua,Yang Guosheng,Ye Lin,Wang Siyan
Dysregulation of deubiquitination contributes to various diseases, including cancer, and aberrant expression of deubiquitinating enzymes is involved in carcinoma progression. As a member of the ovarian tumor (OTU) deubiquitinases, OTUD4 is considered a tumor suppressor in many kinds of malignancies. The biological characteristics and mechanisms of OTUD4 in clear cell renal cell carcinoma (ccRCC) remain unclear. The downregulation of OTUD4 in ccRCC was confirmed based on the TCGA database and a validation cohort of 30-paired ccRCC and para-carcinoma samples. Moreover, OTUD4 expression was detected by immunohistochemistry in 50 cases of ccRCC tissues, and patients with lower levels of OTUD4 showed larger tumor size ( p = 0.015). TCGA data revealed that patients with high expression of OTUD4 had a longer overall survival rate. In vitr o and in vivo studies revealed that downregulation of OTUD4 was essential for tumor cell growth and metastasis in ccRCC, and OTUD4 overexpression inhibited these malignant phenotypes. We further found that OTUD4 sensitized ccRCC cells to Erastin-induced ferroptosis, and ferrostain-1 inhibited OTUD4-induced ferroptotic cell death. Mechanistic studies indicated that OTUD4 functioned as an anti-proliferative and anti-metastasic factor through the regulation of RNA-binding protein 47 (RBM47)-mediated activating transcription factor 3 (ATF3). OTUD4 directly interacted with RBM47 and promoted its stability via deubiquitination events. RBM47 was critical in ccRCC progression by regulating ATF3 mRNA stability, thereby promoting ATF3-mediated ferroptosis. RBM47 interference abolished the suppressive role of OTUD4 overexpression in ccRCC. Our findings provide mechanistic insight into OTUD4 of ccRCC progression and indicate a novel critical pathway OTUD4/RBM47/ATF3 may serve as a potential therapeutic pathway for ccRCC.
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PubMed
高影响因子
Science China-Materials
·
2022
·Vol. 66
·期 2
·522-530
·
IF 8.64
Wu Mengjun,Song Jiangping,Zhu Xinxin,Zhan Hui,Tian Tian,Wang Rui,Lei Jiaheng,Tang Haolin
Composite polymer electrolytes (CPEs) are regarded as promising candidates for high-energy-density all-solid-state lithium metal batteries (ASSLMBs) because they combine the merits of solid polymer electrolytes and inorganic solid electrolytes. However, poor electrode/electrolyte interface compatibility and filler agglomeration limit their practical application. In this study, an in-situ polymerization method was used to create a three-dimensional (3D) hierarchical CPE using 3-(trimethoxysilyl)propyl methacrylate (KH570)-modified Li 6.4 La 3 Zr 2 Al 0.2 O 12 (KH@LLZO) particles. The KH@LLZO-rich (up to 80 wt%) region of the electrolyte provides a rigid barrier to prevent lithium dendrite growth, while the other region of the electrolyte with an appropriate KH@LLZO content (8 wt%) achieving optimal ionic conductivity infiltrates into the entire battery system to allow for smooth Li + transport. The symmetric Li|Li cell exhibits steady lithium plating/stripping cycling over 600 h at 0.3 mA h cm −2 and has a decent critical current density of 0.9 mA cm −2 . This is made possible by the elaborate structure of the electrolytes. Full Li|LiFePO 4 cells have preferable cycling stability (capacity retention of 91.6% after 200 cycles at 0.5 C). Moreover, pouch cells that use the in-situ -formed electrolyte exhibit excellent flexibility and safety. This novel design of 3D hierarchical CPEs using surface-modified LLZO particles paves the way for the development of dendrite-free and high-performance ASSLMBs.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 20
·24902-24909
·
IF 2.478
Yuan Zhigang,Wang Ting,Cai Wanan,Pan Zhongcheng,Wang Jun,Derradji Mehdi,Liu Wen-bin
A new kind of bisphenol A-type epoxy resin (E51) system cured at room temperature was prepared using ether bond- and fluorine-containing aromatic diamine, including 4,4′-(Hexafluoroisopropylidene)bis(p-phenyleneoxy)dianiline (HFBAPP) and 2,2-Bis[4-(4-aminophenoxy)phenyl]propane (BAPP), and acrylic acid (HAA) as hardeners. The curing behavior of epoxy resin was investigated by differential scanning calorimetry (DSC) and Fourier transform infrared (FTIR) Spectroscopy. The thermal properties, dynamic thermomechanical properties, tensile properties, and dielectric properties of the cured epoxy resin at room temperature were evaluated with thermogravimetric analysis (TGA), dynamic mechanical analysis (DMA), universal tensile testing machine, and vector network analyzer, respectively. The surface morphology of the tensile fracture specimen was observed by scanning electron microscope (SEM). The results showed that the curing reaction for this kind of epoxy resin system can be conducted at room temperature without external heating. Compared to BAPP and 4,4′-Diaminodiphenyl methane (DDM), the cured E51/HFBAPP + HAA system demonstrated the best comprehensive properties, such as high thermal stability, high glass transition temperature and storage modulus, high tensile strength and modulus, and low dielectric constant and dielectric loss values at 2–18.3 GHz, which are mainly attributed to the introduction of flexible ether bonds and CF 3 groups into crosslinked epoxy network. SEM testing confirmed that E51/HFBAPP + HAA and E51/BAPP + HAA systems displayed good toughness.
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高影响因子
CELLULOSE
·
2018
·Vol. 26
·期 2
·1195-1208
·
IF 3.809
Song Peng,Shen XiaoPing,He XiaoMei,Feng KaiHui,Kong LiRong,Ji ZhenYuan,Zhai LinZhi,Zhu GuoXing,Zhang DongYang
Abstract Heteroatom-doped porous carbon materials are one of the most promising electrodes for high-performance supercapacitors. However, the development of a simple, green and low-cost strategy for their preparation is still highly challenging. In this study, we reported a simple and sustainable preparation of nitrogen-doped hierarchically porous carbon (NHPC) by using cellulose as raw materials. A NaOH/urea (7:12) system acted as the solvent, activator, and dopant simultaneously. The resultant NHPC has a high BET specific surface area of 2245 m 2 g −1 , a typically porous architecture comprising of micro-, meso-, and macropores with an appropriate average pore size of 2.83 nm, as well as a suitable nitrogen-doping degree of 3 wt%. The unique features of NHPC afford an outstanding specific capacitance of 300 F g −1 at 0.5 A g −1 , representing a new capacitive record among the cellulose-derived carbon electrodes reported so far. The NHPC//NHPC supercapacitor cell displays a high energy density of 17.2 Wh kg −1 at 452 W kg −1 , and maintains 12.1 Wh kg −1 at 4500 W kg −1 . High rate capability (81% of capacitance retention from 0.5 to 10 A g −1 ) and excellent cycling stability (5% loss after 10,000 cycles) have been also demonstrated. The facile and affordable synthesis route together with outstanding energy storage behavior endows the cellulose-derived NHPC with promising application for supercapacitors.
Graphical abstract
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高影响因子
JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2022
·Vol. 30
·期 7
·2943-2954
·
IF 4.705
Lu Yanran,Zhang Wen,Wang Mei,Zhang Hua,Li Jiahui,Luo Wenhao
The adsorption is widely used to remove dyes from wastewater because of its low cost, simple preparation, and environmental friendliness. However, the existing adsorbents suffer from difficult recycling, inconvenient use, and a low regeneration rate. In this study, polyacrylonitrile (PAN) and graphene oxide (GO) was mixed for electrospinning GO/PAN nanofiber membrane and then chitosan (CS) was grafted to obtain CS-GO/PAN nanofiber membrane. CS-GO/PAN membranes were characterized with FE-SEM, EDX, FT-IR and, WCA. The effects of membrane types, dosage, solution pH on the removal of dye sunset yellow (SY) were systematically investigated. The results showed that more than 80% of SY were removed within 15 min at pH 2 using 100 mg CS-GO/PAN membrane. Adsorption kinetic data were fitted well with the pseudo-second-order model and adsorption achieved equilibrium within 240 min. The isotherm study followed the Langmuir model with the actual maximum adsorption capacity of 211.54 mg/g. After 5 adsorption–desorption cycles, the adsorption efficiency and the desorption efficiency of CS-GO/PAN were over 90% and 93%, respectively. Moreover, the membrane recovered easily from the water while its integrity was still maintained. The CS-GO/PAN membrane demonstrates the virtue of high adsorption capacity, easy operation, and good reusability, which could be considered as a promising material for adsorbing dyes in wastewater.
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高影响因子
COLLOID AND POLYMER SCIENCE
·
2014
·Vol. 293
·期 2
·441-451
·
IF 2.41
Cao Hongyan,Wang Qian,Li Min,Chen Zhiyong
A series of poly(ethylene glycol) diacrylate/methacrylic acid (PEGDA/MAA)-based nanogels showing multiresponsiveness toward temperature, salt concentration, and pH value were synthesized by aqueous precipitation polymerization. The effect of monomer loading amount, cross-linking degree, and cross-linker type on synthesis of hydrogels was investigated, and so were the influences of MAA content in the feed of synthesis of hydrogel, pH value, and NaCl concentration on the thermosensitivity of hydrogels. The lower critical solution temperature (LCST) of poly(PEGDA/MAA) hydrogels decreased with an increase of MAA content or NaCl concentration and a decrease of pH value. One of the resultant hydrogels (PEGDA575/MAA, 40/60 mol/mol) displayed a distinct LCST of 35 °C under a gastric liquid-like condition (pH 1.0, 150 mM NaCl). Such hydrogel showed a good potential in controlling the release of 5-fluorouracil (5-FU), an anticancer agents, under the above gastric liquid-like condition and also an intestinal liquid-like one.
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高影响因子
危险品化学品经营许可证（带存储）