RSC Advances
·
2021
·Vol. 11
·期 5
·3003-3011
·
IF 3.361
Jian Wang,Cheng Zhang,Xiao-Qing Ye,Wenting Du,Shenxin Zeng,Jian-Hong Xu,Hong Yin
An efficient and practical benzylic aerobic oxidation catalyzed by cheap and simple N-hydroxyimide organocatalyst has been achieved with high yields and broad substrate scope. The organocatalyst used can be recycled and reused by simple workup and only minute amount (1 mol% in most cases) of simple iron salt is used as promoter. Phenyl substrates with mild and strong electron-withdrawing group could also be oxygenated in high yields as well as other benzylic methylenes. Influence of substituents, gram-scale application, catalysts decay and general mechanism of this methodology has also been discussed.
研究领域:
有机化学
·
催化化学
✓ 已验证
DOI
PubMed
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Yunwen Wu,Mengyun Zhang,Yuhang Jiang,Yiting Tong,Pengfei Chang,Tao Hang,Ming Li
Electrodeposition is a key technology for 3D interconnect in electronic devices, while additives play an essential role in realizing super-filling in 3D interconnect. In this work, the impact of phenyl methyl sulfoxide (PMSO) on cobalt electrodeposition is studied and the underlying mechanism is explored. It is demonstrated that PMSO exhibits excellent inhibition ability even at relatively low concentrations due to its high chemical reactivity, contributed by the active sulfoxide group. We find that a proper concentration (20 ppm) of PMSO is important to achieve low surface roughness around 3.9 nm and uni-hcp (002) orientation due to the effective surface absorption. The nucleation of cobalt is altered to progressive nucleation under the influence of PMSO from instantaneous nucleation in the absence of PMSO, resulting in an even cobalt deposition behavior. Furthermore, the presence of PMSO enhances the wettability and enables the super-filling of cobalt TSV trenches with high quality, thereby indicating that PMSO is an effective additive for practical applications.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
JOURNAL OF VINYL & ADDITIVE TECHNOLOGY
·
2023
·Vol. 30
·期 1
·313-325
·
IF 2.7
Baoming Xu,Jingxue Yang,Xinhui Wang,Na Wang,Guorong Chen,Heng Zhang
In this paper, we report on the synthesis of a new aluminum bis(hydroxy-phenyl-methyl)phosphinate, AlBPi, under mild reaction conditions. The product structure was confirmed via characterization, and its thermal stability and flame retardant properties were assessed. To improve the flame retardant properties, we employed ammonium polyphosphate (APP) as a synergist with AlBPi. The PLA composite material containing 10% AlBPi and 5% APP achieved an LOI of 28.1% and a UL-94 rating of V-1. Cone calorimetry tests showed a significant reduction in PHRR, THR, PSPR, and TSP for the PLA/AlBPi/APP composite compared to the pure and PLA/AlBPi materials. SEM analysis revealed a continuous and dense char layer on the residual surface of the synergistic flame retardant sample. AlBPi and APP exhibited excellent synergistic flame retardant effects, with both releasing a large amount of PO·free radicals. APP was also able to release inert gas, exhibiting excellent flame retardant effects in the gas phase. Additionally, APP improved the charring performance of AlBPi and formed a compact char layer on the material surface, achieving good flame retardant effects in the condensed phase. Therefore, the AlBPi and APP synergistic flame retardant system can be considered a viable flame retardant additive for PLA. Highlights A novel flame retardant AlBPi was synthesized. AlBPi and APP demonstrate good synergistic flame retardant performance in PLA. AlBPi and APP play a flame retardant role in both gas and condensed phases.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Yitong Liu,Tianxiang Du,Zexian Zhang,Ning Ma,Xufeng Dong
Magnetorheological (MR) fluids can rapidly shift between solid and liquid phases in response to changes in an applied magnetic field, which can be precisely controlled by the external environment. This capability underscores the significant potential of MR fluids in damper applications. However, the main challenge is the difficulty in simultaneously enhancing their key properties, which constrains their development potential. In this study, we propose using a novel phenylmethyl siloxane (PSO) with high steric hindrance as the carrier fluid to enhance the overall performance of MR fluids. Compared with conventional dimethyl siloxane (SO) carrier liquid, the PSO carrier fluid, despite its lower viscosity, demonstrated a 17 % enhancement in shear yield strength at the magnetic field of 280 kA/m and a 5 % improvement in sedimentation stability. The Molecular dynamics simulations further confirmed that the presence of benzene side groups, compared to methyl groups, confers superior resistance to deformation and steric hindrance. Consequently, this enhances the shear stress and sedimentation stability of MR fluids during shear deformation. By conducting the comprehensive analysis of experimental results and numerical simulations, this study has deepened our understanding of the intricate relationship between the characteristics of carrier liquid and MR fluids.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
Autophagy
·
2018
·
IF 11.1
Lun Zhao,Li Deng,Qing Zhang,Xue Jing,Meng Ma,Bin Yi,Jing Wen,Chaozhi Ma,Jinxing Tu,Tingdong Fu,Jinxiong Shen
Sulfonylurea (SU) herbicides inhibit branched-chain amino acid (BCAA) biosynthesis by targeting acetolactate synthase. Plants have evolved target-site resistance and metabolic tolerance to SU herbicides; the GCN2 (general control non-repressible 2) pathway is also involved in SU tolerance. Here, we report a novel SU tolerance mechanism, autophagy, which we call ‘homeostatic tolerance,’ is involved in amino acid signaling in Arabidopsis. The activation and reversion of autophagy and GCN2 by the SU herbicide tribenuron-methyl (TM) and exogenous BCAA, respectively, confirmed that TM-induced BCAA starvation is responsible for the activation of autophagy and GCN2. Genetic and biochemical analyses revealed a lower proportion of free BCAA and more sensitive phenotypes in atg5, atg7, and gcn2 single mutants than in wild-type seedlings after TM treatment; the lowest proportion of free BCAA and the most sensitive phenotypes were found in atg5 gcn2 and atg7 gcn2 double mutants. Immunoblotting and microscopy revealed that TM-induced activation of autophagy and GCN2 signaling do not depend on the presence of each other, and these 2 pathways may serve as mutually compensatory mechanisms against TM. TM inhibited the TOR (target of rapamycin), and activated autophagy in an estradiol-induced TOR RNAi line, suggesting that TM-induced BCAA starvation activates autophagy, probably via TOR inactivation. Autophagy and GCN2 were also activated, and independently contributed to TM tolerance in plants conferring metabolic tolerance. Together, these data suggest that autophagy is a proteolytic process for amino acid recycling and contributes to GCN2-independent SU tolerance, probably by its ability to replenish fresh BCAA.
研究领域:
植物生物学
·
分子生物学
·
植物病理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2018
·
IF 2.955
Miao Ba,Zhan-ping Zhang,Yu-hong Qi
In order to figure out the influence of nano-zinc oxide (NZO) on the properties of the fouling release (FR) coating based on polydimethylsiloxane (PDMS) with the incorporation of phenylmethylsilicone oil (PSO), NZO reinforced PSO-PDMS blend coatings were prepared by adjustments to the particle size and pigment-binder ratio (P/B). The surface properties, the mechanical properties, the PSO leaching behavior and the biofilm adhesion assay of the reinforced coatings were investigated. Results indicated that with the increase of particle size and P/B value, surface roughness of the reinforced coatings increased and the mechanical properties of the reinforced coatings were enhanced. The addition of NZO caused PSO to migrate first inside the reinforced coating to form the oil storage sac, then migrate to the reinforced coating surface. Finally, PSO was leached on the reinforced coating surface. Meanwhile, the addition of NZO increased the crosslink density of the reinforced coatings, which caused the decrease of the leaching efficiency of PSO. When the P/B value was more than P/B M , PSO still could not be observed on the reinforced coating surface after 1 year of exposure. And the anti-biofilm adhesion performance of the reinforced coatings decreased due to the increase in difficulty of leaching PSO.
研究领域:
材料科学
·
海洋生物学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2016
·
IF 1.78
Dan-dan Yang,Riu Wang,Jin-long Zhu,Qi-yue Cao,Jie Qin,Hai-liang Zhu,Shao-song Qian
Three novel complexes, [Cu( L ) 2 (H 2 O)]( 1 ), [Zn( L ) 2 (H 2 O) 2 ]·CH 3 OH·1.5H 2 O( 2 ), and [Ni( L ) 2 (H 2 O) 1.8 ]·CH 3 OH·1.2H 2 O ( 3 ) (HL = 2-{4-[bis(4-fluorophenyl)methyl]pipera-zin-1-yl} acetic acid), were synthesized and structurally determined by single-crystal X-ray diffraction. Molecular docking study preliminarily revealed that complex 1 had potential Monoamine oxidase B inhibitory activity. All acquired compounds were tested against rat brain MAO-B in vitro. In accordance with the result of calculation, it showed complex 1 (IC 50 = 1.85 ± 0.31 μ M) have good inhibitory activity against MAO-B at the same micromolar concentrations with positive control Iproniazid Phosphate (IP, IC 50 = 7.59 ± 1.17 μ M). These results indicated that complex 1 was a potent MAO-B inhibitor.
研究领域:
药物化学
·
结构生物学
·
神经科学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCES IN POLYMER TECHNOLOGY
·
2017
·Vol. 37
·期 6
·2152-2157
·
IF 1.291
Xiuming Wang,Tingting Xu,Cuifeng Zhang,Lijun Chen
The novel modified acrylate colloid was synthesized by semi-continuous seeded emulsion polymerization which was initiated with potassium persulfate (KPS), and octylphenol polyoxyethylene ether (OP-10) and sodium dodecyl benzene sulfonate (SDBS) were used as surfactants. Butyl acrylate (BA) and methyl methacrylate (MMA) were used as the main monomers and hexafluorobutyl methacrylate (HFMA, C 8 H 8 F 6 O 2 ), and benzyl methacrylate (BZMA, C 11 H 12 O 2 ) were used as functional monomers. Factors such as the amount of initiator, mass ratio of SDBD to OP-10 and monomers, which have an influence on particle size and morphology of the resultant colloid, are studied. Chemical composition of the modified acrylate colloid was evaluated by Fourier transform infrared spectrometry (FTIR). The thermal performances were characterized by differential scanning calorimetry (DSC) and thermogravimetry (TG). Furthermore, surface hydrophobicity of the latex film was examined by measurement of water absorption and water contact angle. Results indicate that the modified acrylate colloid has highest monomer conversion rate and lowest coagulation percentage when the mass fraction of emulsifier was 4% and mass ratio of SDBS to OP-10 was 1:2, mass fraction of initiator was 0.3%, mass percent of HFMA was 6%, and the amount of BZMA was 2%. Benzene ring-containing monomer is effectively participated in the reaction and has improved the thermal performance and surface properties of copolymer colloid. The resultant colloid has excellent hydrophobicity and low surface energy. Solid content of the resultant colloid was about 30% (wt %).
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2024
·
IF 6.5
Jingyu Xu,Yuhong Qi,Zhanping Zhang
Fluorosilicone polymers with a high fluorinated group content are shielded from their interactions with crosslinking agents and solvents by their closely arranged fluorinated groups on their surface. Herein, a series of poly(dimethyl-methylphenyl-methyltrifluoropropyl)siloxanes (PDPFSs) were synthesized using the hydrolysis–polycondensation method to reduce the shielding effect of the fluorinated groups. Dimethyl dimethoxy silane, phenyl methyl dimethoxy silane, and 3,3,3-trifluoropropyl methyl dimethoxy silane (TFMDS) were the main raw materials. The chemical structure of PDPFS and the thermal stability, surface properties, mechanical properties, and antifouling properties of the PDPFS coating were characterized. When the TFMDS content increased from 0 to 40 wt%, the number average molecular weight of PDPFS decreased from 43,380 to 38,433 g/mol and the chemical crosslinking rate of the PDPFS coating decreased from 81.25 % to 68.09 %. An analysis of the surface properties of the PDPFS coating revealed a decrease in surface free energy from 24.22 to 13.19 mJ/m 2 and an increase in roughness from 0.013 to 0.048 μm. The mechanical properties were examined, indicating that the Young's modulus of the PDPFS coating increased from 0.10 to 0.46 MPa and the average molecular weight between crosslinking points increased from 24,795 to 3285 g/mol. Experimental results revealed that the anti-adhesion efficiency and removal efficiency of the PDPFS coatings was mainly related to the TFMDS content. The anti-adhesion efficiency and removal efficiency were proportional to roughness, Young's modulus, and crosslinking density and inversely proportional to number average molecular weight and surface free energy. Further analysis of the comprehensive antifouling ability of the PDPFS coatings revealed that the antifouling efficiency of the PDPFS coating gradually increased from 16.83 % to 62.12 % with increasing TFMDS content. However, the 3,3,3-trifluoropropyl group exhibited an adverse effect on the hydrolysis–polycondensation and crosslinking reactions when the TFMDS content exceeded 35 wt%. Hence, PDPFS with a TFMDS content of 35 wt% was selected for further research.
研究领域:
材料科学
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2023
·Vol. 332
·期 12
·5035-5043
·
IF 1.6
Li Lin,Qian Zhenghua,Zhang Hengrui,Duan Xilei,Liu Xueyang,Zhang Qiang,Qiao Yanbo
The porous compound generated from the reaction of 4-[tris(4-carboxyphenyl)methyl]benzoic acid (H4MTB) with actinide Th in simulated high-level radioactive waste can adsorb Ru, which can separate Th and Ru by more than 68.1 and 37.3%, respectively, in simulated high-level radioactive waste. The waste liquid before and after separation was vitrified with borosilicate glass and iron phosphate glass. The composition and morphology of the glasses were characterized by XRD, SEM and ICP‒OES, and the product consistency test was used to measure the chemical durability of the glasses. The chemical stability and waste loading of the glasses after the separation of actinide and noble metal elements was significantly improved. This work is of great significance for the recovery and utilization of actinide and noble metal elements in high-level radioactive waste and the optimization of the vitrification process of radioactive waste.
研究领域:
核化学
·
放射性废物管理
·
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
RUSSIAN JOURNAL OF COORDINATION CHEMISTRY
·
2025
·
IF 1.1
Cai C. L.,Fang X. H.,Ye H. D.,Zhang X. L.,Chen W. H.,Zhou A. X.,Chen F. Y.,Peng H. N.
Treatment of o -carborane with n -butyllithium, sulfur and CpCo(CO)I 2 in CH 2 Cl 2 at room temperature gives the half-sandwich 16e carborane complex CpCo[S 2 C 2 B 10 H 10 ], which reacts with PPh 2 Me, PPhMe 2 , PMe 3 to afford addition products CpCo[S 2 C 2 B 10 H 10 ]PPh 2 Me ( I ), CpCo[S 2 C 2 B 10 H 10 ]PPhMe 2 ( II ), CpCo[S 2 C 2 B 10 H 10 ]PMe 3 ( III ), respectively. I , II and III have been characterized by IR, 1 H NMR, 13 C NMR, 11 B NMR, elemental analysis, mass spectrum and single-crystal X-ray diffraction analysis (CIF files CCDC nos. 2394909 ( I ), 2394910 ( II ), and 2394908 ( III )).
研究领域:
无机化学
·
有机金属化学
·
晶体学
·
配位化学
·
硼化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）