Frontiers of Chemical Science and Engineering
·
2017
·Vol. 11
·期 4
·586-593
·
IF 1.712
Liu Huan,Ma Zhen
Hexagonal CePO 4 nanorods were prepared by a precipitation method and hexagonal CePO 4 nanowires were prepared by hydrothermal synthesis at 150 °C. Rh (NO 3 ) 3 was then used as a precursor for the impregnation of Rh 2 O 3 onto these CePO 4 materials. The Rh 2 O 3 supported on the CePO 4 nanowires was much more active for the catalytic decomposition of N 2 O than the Rh 2 O 3 supported on CePO 4 nanorods. The stability of both catalysts as a function of time on stream was studied and the influence of the co-feed (CO 2 , O 2 , H 2 O or O 2 /H 2 O) on the N 2 O decomposition was also investigated. The samples were characterized by N 2 adsorption-desorption, inductively coupled plasma optical emission spectroscopy, X-ray diffraction, transmission electron microscopy, X-ray photoelectron microscopy, hydrogen temperature-programmed reduction, oxygen temperature-programmed desorption, and CO 2 temperature-programmed desorption in order to correlate the physicochemical and catalytic properties.
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JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 53
·期 5
·3640-3646
·
IF 2.599
Jiao Zhenmin,Qiu Jun
Designing the structure with dielectric loss and magnetic loss integrated contributes to expansion of microwave absorption bandwidth. Nanohybrid materials composed of iron oxide (Fe 3 O 4 ) and multiwalled carbon nanotubes (MWCNTs) were prepared through a newly electrostatic attraction method as high-performance microwave absorbers in the 2–18 GHz band. The nanohybrids are characterized by transmission electron microscopy, X-ray diffraction, and vector network analysis. Microstructural analysis showed that Fe 3 O 4 and MWCNTs were well-connected through electrostatic interaction in the nanohybrids. The experimental results indicated that MWCNTs/PEDOT: PSS/Fe 3 O 4 possessed higher reflection loss and broader absorption bandwidth than MWCNTs. MWCNTs/SDBS/Fe 3 O 4 had better matching of dielectric loss and magnetic loss, the absorption bandwidth below − 10 dB was up to 8 GHz. This work further reveals that the novel electrostatic attraction method could be efficiently enlarged electromagnetic wave attenuation performance in absorb materials.
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Science China-Chemistry
·
2019
·Vol. 62
·期 12
·1710-1719
·
IF 6.085
Wang Guishuo,Luo Ran,Yang Chengsheng,Song Jimin,Xiong Chuanye,Tian Hao,Zhao Zhi-Jian,Mu Rentao,Gong Jinlong
Metal oxide-promoted Rh-based catalysts have been widely used for CO 2 hydrogenation, especially for the ethanol synthesis. However, this reaction usually suffers low CO 2 conversion and alcohols selectivity due to the formation of byproducts methane and CO. This paper describes an efficient vanadium oxide promoted Rh-based catalysts confined in mesopore MCM-41. The Rh-0.3VO x /MCM-41 catalyst shows superior conversion (~12%) and ethanol selectivity (~24%) for CO 2 hydrogenation. The promoting effect can be attributed to the synergism of high Rh dispersion by the confinement effect of MCM-41 and the formation of VO x -Rh interface sites. Experimental and theoretical results indicate the formation of til-CO at VO x -Rh interface sites is easily dissociated into *CH x , and then *CH x can be inserted by CO to form CH 3 CO*, followed by CH 3 CO* hydrogenation to ethanol.
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MEDICINAL CHEMISTRY RESEARCH
·
2016
·Vol. 26
·期 1
·44-51
·
IF 1.436
Li Bochao,Zhang Dawei,Zhang Yumin,Dan Jiang,Li Shuang,Lei Wei,Wang Huiying,Lin Feng
The azole pharmacophore is still regarded as a viable lead structure for the synthesis of more efficacious and broad-spectrum antimicrobial agents. In this study, a novel series of triazole derivates that are structurally related to the famous antimicrobial azole pharmacophore were synthesized and the structures of them were characterized by spectral (IR, 1 H NMR, 13 C NMR, and MS spectra) analysis. Antimicrobial activity was measured against both bacteria and fungus. In vitro antimicrobial evaluation showed that five compounds had growth inhibitory effects on the tested Gram-positive bacteria and fungus with special efficacy. Potential antibacterial and antifungal activities are incorporated in these triazole compounds. Results of antimicrobial activities also revealed that compounds ( 5a–i ) were the potent antibacterial and antifungal agents as compared to standard drugs (ciprofloxacin and itraconazole), and thus could be promising new lead molecules.
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JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 15
·10732-10742
·
IF 2.993
Dong Yue,Lei Hong,Liu Wenqing,Wang Tianxian,Xu Lei
Chemical–mechanical polishing is the only technology that can provide a global planarization, and has become widely accepted. Abrasives are one of the important factors influencing chemical–mechanical polishing. In order to improve surface planarization and increase material removal rate of sapphire substrates, non-spherical silica composite abrasives were synthesized by lanthanum ion-induced effect-assisted growth method. Scanning electron microscopy showed the morphologies of non-spherical silica composite abrasives were peanut-shaped, chemical–mechanical polishing tests displayed the material removal rate of the non-spherical silica composite abrasives increased by 32.6% compared with spherical silica composite abrasives, Ambios Xi-100 surface profiler indicated the best surface roughness of sapphire substrate was 1.540 nm, and the element compositions of solids after polishing were analyzed by X-ray photoelectron spectroscopy, which investigated the interactions between abrasives and sapphire substrates. Non-spherical silica composite abrasives may lead to more solid-chemical reactions with sapphire substrates, and higher material removal rate may be also attributed to the mechanical grinding effect enhanced owing to the unique shape to achieve the purpose of material removal.
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2022
·Vol. 103
·期 2
·416-424
·
IF 2.606
Zhai Shengnan,Wang Hongbo,Fu Jiajia,Yu Kejing,Meng Chaoran
A novel method for improving the thermal protection performance of protective materials in high temperature flame environment was provided. The aramid fiber fabric reinforced hybrid silica aerogel composite (AF-HSiO 2 ) was prepared by the two-step sol-gel method using AF nonwovens as the three-dimensional reinforced materials, deionized water as the sole solvent and hybrid silica aerogel (HSiO 2 ) as the growth substrate followed by freeze-drying method (FD). The resulted composites perfectly owned their nano porous structure and excellent properties of high porous (81.12%), low bulk density (0.1612 g cm −3 ) and large surface area (659 m 2 g −1 ). In addition, when the composite was exposed to a high heat flux of 84 ± 2 kW m −2 , the thermal protection performance increased by 27.97% compared with the commercial thermal liner of fire-fighting clothing. The nature also endowed the composites with tensile strength (319.2 N) and hydrophobic angle (136°). These favorable multi-features indicate that composites have broad prospects in thermal protection filed.
Graphical abstract
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Journal of Inorganic and Organometallic Polymers and Materials
·
2019
·Vol. 30
·期 5
·1483-1489
·
IF 1.637
Xiaogang Liu,Yuwen Cheng,Xiu Wang,Minglei Tian,Xiancai Li,Yifeng Yang
Using 3-chloropropyltriethoxysilane as an anchor, the functional monomer linear polyethylenimine(PEI) was grafted on the surface of mesoporous MCM-41. La 3+ was selected as the template ion and epichlorohydrin was used as the crosslinker. A lanthanum ion MCM-41 imprinted polymer (La(III)-IIP-PEI/MCM-41) was prepared, and a non-ion-imprinted polymer (NIP-PEI/MCM-41) was arranged in the same manner. The La 3+ surface imprinted polymer was characterized by means of infrared spectrometer, thermogravimetric(TG) analyzer, and scanning electron microscope(SEM). The optimal adsorption conditions and selective adsorption properties of La(III)-IIP-PEI/MCM-41 for La 3+ were determined by static adsorption method and adsorption performance. Experiments show that the maximum adsorption capacity of La(III)-IIP-PEI/MCM-41 can reach 212.69 mg g 1 . Adsorption equilibrium can be reached at 30 min. Quasi-second-order kinetic model can be used to describe its adsorption mechanism. La(III)-IIP-PEI/MCM-41 also has a strong selectivity for La 3+ .
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Scientific Reports
·
2018
·Vol. 8
·期 1
·1-8
·
IF 4.122
Zhu Ning,Liu Yihuan,Liu Junhua,Ling Jun,Hu Xin,Huang Weijun,Feng Weiyang,Guo Kai
A novel metal-free and protecting-group-free synthesis method to prepare telechelic thiol-functionalized polyesters is developed by employing organocatalysis. A scope of Brønsted acids, including trifluoromethanesulfonic acid ( 1 ), HCl.Et 2 O ( 2 ), diphenyl phosphate ( 3 ), γ-resorcylic acid ( 4 ) and methanesulfonic acid ( 5 ), are evaluated to promote ring-opening polymerization of ε-caprolactone with unprotected 6-mercapto-1-hexanol as the multifunctional initiator. Among them, diphenyl phosphate ( 3 ) exhibits great chemoselectivity and efficiency, which allows for simply synthesis of thiol-terminated poly(ε-caprolactone) with near-quantitative thiol fidelity, full monomer conversion, controlled molecular weight and narrow polydispersity. Kinetic study confirms living/controlled nature of the organocatalyzed chemoselective polymerizations. Density functional theory calculation illustrates that the chemoselectivity of diphenyl phosphate ( 3 ) is attributed to the stronger bifunctional activation of monomer and initiator/chain-end as well as the lower energy in hydroxyl pathway than thiol one. Moreover, series of tailor-made telechelic thiol-terminated poly(δ-valerolactone) and block copolymers are efficiently generated under mild conditions.
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MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 8
·1-12
·
IF 6.408
Wan Yu,Wang Huiting,Zhang Ling,Chen Yaxian,Li Shun,Zhou Jie,Zhang Qian,Xia Lixin
A highly stable electrochemical biosensor for pesticide detection was developed. For the first time polymeric ionic liquids (PILs) were introduced to construct an acetylcholinesterase (AChE) biosensor . AChE was entrapped in PILs microspheres through an emulsion polymerization reaction, where negatively charged Au nanoparticles (Au NPs) can be immobilized by the positively charged PILs, leading to improved catalytic performance. The results suggest that the positively charged PILs not only provide a biocompatible microenvironment around the enzyme molecule, stabilizing its biological activity and preventing its leakage, but also act as a modifiable interface allowing other components with electron transport properties to be loaded onto the polymer substrate, thus providing an efficient electron transport channel for the entrapped enzyme. More notably, when AChE was immobilized in a positively charged environment, the active site is closer to the electrode, promoting faster electron transfer. The detection limits of the constructed electrochemical biosensor AChE@PILs@Au NPs/GCE toward carbaryl and dichlorvos (DDVP) were 5.0 × 10 −2 ng ml −1 and 3.9 × 10 −2 ng ml −1 , in a wide linear range of 6.3 × 10 −2 –8.8 × 10 2 ng ml −1 and 1.3 × 10 −1 –1.4 × 10 3 ng ml −1 , respectively. More importantly, the biosensor has high thermal and storage stability, which facilitates rapid field analysis of fruits and vegetables in a variety of climates. In addition, the biosensor reported has good repeatability and selectivity and has high accuracy in the analysis of peaches, tap water, and other types of samples. Graphical abstract
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Science China-Chemistry
·
2018
·Vol. 61
·期 4
·412-417
·
IF 4.448
Si Yanyan,Liang Lujun,Tang Shan,Qi Yunkun,Huang Yong,Liu Lei
Ubiquitin (Ub) chain isopeptide bond mimics are useful molecules for biochemical and biophysical studies. Herein, we report the semi-synthesis of the disulfide-linked K11/K48-branched tri-Ub (Ub 3 11/48 (S–S)), the first example of an isopeptide mimic for the branched Ub chains, which have recently emerged as an interesting category of Ub modifications. Our strategy comprised the E1-dependent synthesis of the Ub conjugate of aminoethanethiol, followed by disulfide formation with Ub(K11C, K48C). The structure of the synthetic isopeptide bond mimics was verified by the crystal structure of Ub 3 11/48 (S–S). Deubiquitination and pulldown assays indicated that the synthetic Ub 3 11/48 (S–S) could be hydrolyzed by linkage-specific deubiquitinases (K11-specific Cezanne and K48-specific OTUB1), and recognized by proteasomal ubiquitin receptor S5a.
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CHROMATOGRAPHIA
·
2022
·Vol. 85
·期 9
·851-863
·
IF 2.213
Jiang Xiao-Xue,Sun Yue-Na,Zhang Chen,Yang Zhao,Yu Li-Qing,Lv Yun-Kai
In this paper, SiO 2 @MOF-199 composite with core–shell structure was prepared by in-situ growth of MOF-199 on the surface of SiO 2 microspheres, and SiO 2 @MOF-199 coated fiber was prepared for headspace solid phase microextraction (HS-SPME) of phthalate esters (PAEs) in plastic bottled milk. The prepared SiO 2 @MOF-199 has both mesoporous structure of SiO 2 and microporous structure of MOF-199. The hierarchical porous structure not only gives the analyte higher adsorption performance, but also improves the diffusion rate of the analyte in SiO 2 @MOF-199. The coated fibers have good thermal stability and are relatively uniform in size and structure. The extraction conditions of the prepared fibers for PAEs were optimized by single factor optimization and response surface Box-Behnken design. Under optimized conditions, the fiber displays wide linear ranges of PAEs (dimethyl phthalate, diethyl phthalate and diallyl phthalate are 5–800 ng L −1 , di-n-butyl phthalate, butyl benzyl phthalate and di-n-octyl phthalate are 50–1000 ng L −1 ), low limits of detection (0.3–19.8 ng L −1 ), and high enrichment factors (325–2089). The intra-day and inter-day relative standard deviations (RSD) for PAEs extractions using a single fiber were (4.7–8.5%) and (5.7–9.1%), respectively. The fiber-to-fiber reproducibility for three fibers prepared in parallel was 7.2–11.3% (RSD). The method was successfully applied to the extraction of PAEs from plastic bottled milk and to the quantitation by a gas chromatograph with a flame ionization detector. The average recoveries were 84.0% to 105%.
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Science China-Materials
·
2022
·Vol. 66
·期 2
·556-566
·
IF 8.64
Gong Zongshuai,Song Chunlai,Bai Chong,Zhao Xiaomeng,Luo Zhiqiang,Qi Gaocan,Liu Xizheng,Wang Cheng,Duan Yueqin,Yuan Zhihao
Aqueous Zn-I 2 batteries (AZIBs) are highly desirable for green energy-storage technologies, but their development was greatly limited by their unsatisfactory energy densities. Herein, we report high-energy-density rechargeable AZIBs achieved by anchoring high-mass iodine to a distinctive N-doped hierarchical porous carbon (NHPC) material with large micropore volume and rich N-doping. The NHPC combined strong iodine confinement caused by the micropore and powerful chemisorption of iodine species with pyridine-N doping, which enabled high loads of iodine up to 61.6 wt%. Notably, density functional theory calculations and experimental studies showed that abundant pyridine-N active sites promoted electron transfer, and the interconnected micro-mesoporous structure facilitated the Zn-ion diffusion to synergistically promote the redox kinetics of AZIBs. The high content of iodine-loading cathode exhibited a high capacity of 219.3 mA h g −1 at 1.0 C, indicating excellent rate capability and superior cycling stability with a low capacity decay of 0.00147% per cycle within 10,000 cycles at 5.0 C. In addition, a preliminary device assembled with three batteries in series provided a high energy density of up to 72.6 W h kg −1 calculated by the total mass of the battery, which is almost two times that of the commercial aqueous lead-acid and Ni-Cd batteries. The high energy density and long cycle life of this aqueous battery indicate its great application potential in large-scale energy storage.
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