THERMOCHIMICA ACTA
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2022
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IF 3.378
Yiqinq Xia,Linze Liu,Lian Wang,Rui Shi,Shuai Yan,Xingyu Zhao,Yuping Sheng,Zhi Wang
In this paper, a novel 4-allyl-substituted 1,3-benzoxazine (P-a-[4]ally) was successfully synthesized based on the allylation reaction of aldimines. The chemical structures of intermediates (P-1 and P-2) and P-a-[4]ally were characterized by NMR spectra, and Fourier transform infrared (FT-IR) spectra. The polymerization and curing kinetics were studied by DSC and in-situ FT-IR, and the charge densities of atoms were calculated by Materials Studio. The activation energy of the curing reaction was 108.3 kJ·mol −1 by the Kissinger-Akahira-Sunose method and 111.0 kJ·mol −1 by the Ozawa method. Thermomechanical analysis (TMA), thermogravimetric analysis (TGA), and an Agilent impedance analyzer were used to investigate the thermal and dielectric properties of poly-benzoxazine (P(P-a-[4]ally)). The results revealed that the glass transition temperature ( T g ) of P(P-a-[4]ally) was 154 °C, the temperature at 5% weight loss ( T d,5% ) was 329 °C, the char yield was 21.2% at 800 °C under N 2 , and the dielectric constant was 3.33 at 1 MHz.
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ACS Applied Nano Materials
·
2022
·
IF 6.14
Peipei Li,Zhenjuan Xu,Lili Zhao,Haoyu Chen,Xiaohua Zhu,Youyu Zhang,Meiling Liu,Shouzhuo Yao
Development of nanoluminophores with high efficiency, good stability, and excellent electronic transfer ability is one of the key challenges in electrochemiluminescence (ECL). Here, a porphyrin-based nanomaterial named Fc-TCPP was synthesized by self-assembly of 1,1′-ferrocenedicarboxylic acid (Fc(COOH)2) and tetrakis-(4-carboxyphenyl) porphyrin (TCPP) under infrared heating light. By tuning the ratio of the precursors, the morphology of Fc-TCPP can be regulated from primitive nanospheres to thorn-ball flowers decorated with branches and particles, and the possible formation mechanism was proposed. Nano-boron carbide (B4C) with carbon defect sites further boosts the ECL performance of Fc-TCPP, and thereby, an ECL biosensor for AFP was constructed innovatively. This study provides a simple and effective strategy for the preparation of ECL nanoluminophores taking the advantages of ferrocene and TCPP, opening a new horizon to design porphyrin-based nanomaterials with various structures and expanding their application in biosensing and disease diagnosis.
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DALTON TRANSACTIONS
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2022
·Vol. 51
·期 47
·18248-18256
·
IF 4.569
Yuqin Jin,Jing Zheng,Linyu Zhu,Xue-Bo Yin,Min Zhang
A facile and rational strategy for immobilizing nickel nanoparticles (Ni NPs) on silica nanotubes (SiO2@C–Ni) was developed via the Stöber method, nickel ion mediated dopamine polymerization and carbonization treatment, coupled with removal of the template of one-dimensional (1D) MnO2 nanowires (NWs). The as-prepared SiO2@C–Ni nanotubes show vast interior space with a large specific surface area and an open channel, which offer a spacious transport channel for molecular diffusion and electron transfer. Consequently, SiO2@C–Ni nanotubes exhibited outstanding catalytic efficiency and excellent stability for 4-nitrophenol (4-NP) reduction. Their superior catalytic activity could be ascribed to the high coverage of Ni NPs and the tubular structure of the obtained SiO2@C–Ni, by which the silica nanotubes enhanced the accessibility of the active sites and increased the mass transfer. This facile and controllable strategy may introduce a new avenue for designing metal NP-supported composites with high dispersion for diverse applications.
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Journal of the Taiwan Institute of Chemical Engineers
·
2022
·
IF 5.477
Chenchen Zhang,Yaozong Gao,Jian Yin,Yufeng Zhang,Jianqiang Meng
Background Porous organic polymers (POPs) are excellent candidates for supporting and stabilizing metal nanocatalysts. The preparation of POPs monolithic membranes as carrier materials for continuous flow catalytic reactors is of significant industrial value. Methods In this work, monolithic poly-melamine-formaldehyde (ah-PMF) gel-filled membranes were prepared by filling high internal phase emulsions containing melamine and paraformaldehyde into nickel membranes with specific shapes. After in situ loading of palladium nanoparticles (Pd NPs) in ah-PMF, the composite membranes were used for the catalytic reduction of p-nitrophenol (4-NP) to p-aminophenol (4-AP) under both static and continuous flow conditions. Significant findings The ah-PMF with high specific surface area and advanced hierarchical porous structure can be obtained by regulating the F127 feed, which is beneficial to improving the catalytic efficiency. The results showed that the Pd@ah-PMF composite membrane had better catalytic activity when the F127 content was 35%, especially in the continuous flow catalytic process, with 99% conversion of 10 mg/L 4-NP in 21 min. In addition, the Pd@ah-PMF showed good recyclability. This work provides a strategy for the design of carrier materials for continuous flow reactors.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2022
·
IF 7.305
Xiatong Qin,Bin Xu,Jianjun Lin,Jiaqi Chen,Hanyu Tong,Ye Chen,Pingxiong Yang,Junhao Chu,Lin Sun
Electrodeposition is a promising method to fabricate Cu 2 ZnSn(S,Se) 4 (i.e., CZTSSe) absorber layer thanks to its many advantages such as low-cost and large-scale. However, the secondary phases and intrinsic defects in electrodeposited CZTSSe solar cells inevitably limit the photoelectric performance. Herein, two different kind of precursor films (binary-ternary selenide vs. quaternary selenide) are deliberately fabricated and the effect of these precursors on the secondary phases and intrinsic defects of CZTSSe absorber layer are investigated comprehensively. The absorber layer obtained from binary-ternary selenide precursor has a small amount of ZnSe secondary phases and Cu Sn deep defects , whereas that obtained from the quaternary selenide precursor exhibits the favorable V Cu shallow defects, which is beneficial to the efficiency improvement in CZTSSe. Based on the quaternary selenide precursor film, the CZTSSe solar cell with 10.03% total area efficiency (the active area efficiency is 10.9%) was obtained. This is the highest efficiency of CZTSSe solar cells prepared by the electrodeposition method.
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EUROPEAN POLYMER JOURNAL
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2022
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IF 5.546
Xiang Xu,Yi Shen,Yue Shu,Yong Guan,Dafu Wei
Blue light hazards have garnered increasing attention owing to the popularity of displays. Although melanin on the retina acts as a blue light barrier, overexposure to blue light increases the risk of visual damage. A class of methyl indole- n -carboxylate oligomers (O-MI n C, n = 3, 4, 5, 6, and 7) was synthesized through solid-phase oxidative polymerization. Based on the experimental characterizations, including time-of-flight mass spectrometry, infrared spectroscopy, and density functional theory calculations of the average local ionization energy, we proposed a mechanism for the oxidative polymerization of methyl indole-4-carboxylate (MI4C). Methyl indole-4-carboxylate oligomer (O-MI4C) is composed of cyclic oligomers containing large conjugated structures that are generated by the repetition of electron deprivation, radical coupling, and dehydrogenation reactions. O-MI4C exhibits the best blue light absorption among its allotropes substituted at different positions with a cut-off absorption wavelength of 530 nm. Finally, O-MI4C was added to polymethylmethacrylate (PMMA) and Columbia resin 39 (CR-39) flakes through in situ polymerization to investigate the behavior of blue light blocking. The PMMA/O-MI4C (0.01 wt%) and CR-39/O-MI4C (0.02 wt%) can block 25% and 35% of blue light; however, they have no significant effect on green and orange lights.
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Materials Science and Engineering B-Advanced Functional Solid-State Materials
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2022
·
IF 3.407
Xiaoting Chen,Lehui Liu,Yisheng Huang,Feifei Yuan,Lizhen Zhang,Zhoubin Lin
In this article, a series of Dy x Ca 3 Gd 2-x (BO 3 ) 4 (x = 0.02–0.2) polycrystalline compounds were synthesized by solid-state reaction to select the optimum concentration for single crystal growth, after then a 6.36 at.% Dy 3+ :Ca 3 Gd 2 (BO 3 ) 4 (Dy:CGB) single crystal with a disordered structure was successfully grown by the Czochralski method . The spectroscopic properties and Judd-Ofelt analyses of the crystal were carried out. Focusing on the absorption cross-section at 453 nm corresponding to the emission bands of InGaN laser diodes, the Dy:CGB crystal has a comparatively large value of 0.95 × 10 -21 cm 2 with a full width at half maximum (FWHM) of 10.2 nm. The yellow light emission cross-section at 576 nm is 2.2 × 10 -21 cm 2 with a FWHM of 14.0 nm. The Judd-Ofelt parameters Ω 2 , Ω 4 and Ω 6 were obtained to be 2.79 × 10 -20 cm 2 , 2.10 × 10 -20 cm 2 and 2.28 × 10 -20 cm 2 , respectively. The fluorescence lifetime of 4 F 9/2 → 6 H 13/2 transition was measured to be 0.26 ms. These results reveal that the Dy:CGB crystal is a promising yellow laser candidate.
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ENVIRONMENTAL RESEARCH
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2022
·
IF 8.431
Zhiyuan Zhao,Jinna Zhang,Jie Yao,Shijie You
Electro-oxidation is a promising technology for removal of refractory organic pollutants. While the appeal of this technology lies in its chemical-free nature, commercially scale-up application may be limited by the availability of electrode materials and mass transport. Here we report the development of a flow-through electro-oxidation system for removal of chlorophenols in water using Magnéli-phase (Ti 4 O 7 ) tubular anode and a 304 stainless steel (SS) tubular cathode. The key to this system was the porous and conductive Magnéli-phase Ti 4 O 7 anode, the structure and composition of which was confirmed by scanning electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. System efficacy was evaluated by using 4-chlorophenol (4-CP) as a typical refractory contaminant and model chlorophenol. Under optimized conditions, a complete removal of 4-CP could be obtained within 120 min in 0.04 mol L −1 Na 2 SO 4 solution. Electro-produced HO • and direct electron transfer were both shown to contribute to the 4-CP electro-oxidation process due to the high selectivity and oxygen evolution potential of the Ti 4 O 7 anode. The intermediates of 4-CP degradation were identified and a pathway for its electro-oxidation was proposed. When challenged with industrial wastewater containing 4-CP, chemical oxygen demand (COD) and total organic carbon removal efficiencies of 67.5% and 63.1% respectively could be obtained, accounting for energy consumption of 85.1 kWh·kg COD −1 for degradation of 1 kg of COD in industrial wastewater. This study provides an effective and robust solution for the removal of refractory emerging contaminants from industrial wastewaters using a continuous-flow electro-oxidation system.
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Frontiers in Chemistry
·
2022
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IF 5.545
Fang Shanfang,Dang Yuan-Ye,Li Haizhou,Li Hongxia,Liu Jiayong,Zhong Rongcui,Chen Yongzhi,Liu Shouping,Lin Shuimu
Bacteria have developed increasing resistance to currently used antimicrobial agents. New classes of antimicrobial drugs are urgently required to fight drug-resistant pathogens. Here, we designed and synthesized a series of calix[4]arene derivatives as antibacterial agents by biomimicking the structural properties and biological functions of antibacterial peptides. After introducing cationic hydrophilic moieties and preliminary structural optimization, we obtained a lead compound (16) that exhibited excellent antibacterial activity against Gram-positive bacteria, low toxicity toward mammalian cells and poor hemolytic activity. The antibacterial mechanism studies showed that compound 16 can destroy bacterial cell membrane directly, leading to bacterial death and a low tendency to develop bacterial resistance.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Xiaohui Wang,Xue Wang,Yali Wang,Quanguo Zhai,Yucheng Jiang,Shuni Li
Octahedral molecular sieve – 5 (OMS-5), a typical 2 × 4 tunnel manganese oxide, is considered as an adsorbent for rubidium ion (Rb + ) because of its specific tunnel structure. Also, manganese oxide-based nanomaterials are also widely used in supercapacitor energy storage and capacitor deionization electrodes due to their high specific capacitance. In this work, a series of protonated OMS-5 (H-OMS-5, H-Co-OMS-5, and H-Ni-OMS-5) nanobelts are synthesized and used as electrode materials for electrochemical enrichment of Rb + in aqueous solution. The specific capacity values for H-OMS-5, H-Co-OMS-5, and H-Ni-OMS-5 at 1 A·g −1 are of 159, 168, and 215 F·g −1 , respectively. Thanks to the unique protonated 2 × 4 tunnel structure, well regulating surface area, and excellent specific capacitance, the maximum Rb + adsorption capacities of H-OMS-5, H-Co-OMS-5, and H-Ni-OMS-5 can reach to 390.3, 405.7, and 481.7 mg·g −1 , respectively. These results indicate that the protonated 2 × 4 tunnel manganese dioxide nanobelts are of great potentials as faradaic electrode materials for selective rubidium ion enrichment applications.
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VACUUM
·
2023
·
IF 4
Pengfei Zhu,Hua Fang,Yanli Zhu,Jinqiang Zhou,Xueyong Guo
Ammonium perchlorate-based molecular perovskites (DAP-4) have garnered immense interest due to their exceptional burst performance and good thermal stability. Similarly, metallic hydrides are widely acknowledged as an exceedingly promising material class for implementation in energetic systems, given their exceptional hydrogen storage density. Therefore, it is crucial to investigate the impact of hydrogen storage material MgH 2 on the thermal decomposition and combustion characteristics of molecular perovskite materials ((H 2 dabco)[NH 4 (ClO 4 ) 3 ],DAP-4). In this study, DAP-4/MgH 2 composites were synthesized and characterized for their morphology, structure, elemental distribution, thermal decomposition properties, and combustion properties. The findings indicated that the inclusion of MgH 2 reduce the thermal decomposition temperature of DAP-4. Moreover, when MgH 2 was added at a mass ratio of 5 wt %, the apparent activation energy ( E a ) decreased to 212.0 kJ/mol, while the peak combustion pressure and boosting rate increased with more intense flames. A plausible thermal decomposition and combustion mechanism of DAP-4/MgH 2 composites was postulated. This study enhances our understanding of the thermal decomposition and combustion properties of DAP-4 and magnesium hydride in energy-containing systems.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 27
·e54005
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IF 3
Fuchun Wang,Jiexiong Wang,Wei Ma,Bingtao Tang,Shufen Zhang
A kind of copolymer, poly(4-vinylsulfonylaniline- co -acrylamide) (P(VSA- co -AM)), was synthesized by the copolymerization of 4-vinylsulfonyl aniline (VSA) and acrylamide (AM) using tetrahydrofuran (THF) as the solvent and 2,2′-azobis(2-methylpropionitrile) (AIBN) as the initiator in the presence of a total monomer mass concentration of 15%, and a polymerization duration of 10 h. The effect of the monomer feed ratio on the copolymerization is investigated, and the results reveal that increasing the content of VSA in the monomer feed ratio increases the proportion of VSA in the copolymer. A feed ratio of 5:5 is selected for the copolymerization of VSA and AM, and a copolymer with 28% VSA is obtained. After diazotization, P(VSA- co -AM) with a molecular weight of 4.45 × 10 3 and a VSA ratio of 28% is coupled with the coupling component containing more chloro-s-triazine reactive groups, thus resulting in macromolecular reactive dyes. The fixation of the obtained macromolecular reactive dyes A, B, and C on cotton fabric is over 93% and have good light, rubbing, and washing fastnesses, thus indicating their potential application in the dyeing of cotton fabric.
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