JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2017
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IF 4.233
Xinhua Cao,Qianqian Ding,Aiping Gao,Haiting Lv,Na Zhao,Dan Liu
A new serial of gelators with two cholesteryl groups based on o-phenylenediamine, m-phenylenediamine and p-phenylenediamine were synthesized, and their organogelation ability was evaluated. We found that G-o could form gels in DMF, DMSO and ethyl acetate, G-m and G-p could only gel DMF and 1,4-dioxane. The organogels were thoroughly characterized using various microscopic techniques including field-emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), UV–Vis spectrum, FT-IR spectrum and contact angle. The gelation ability, morphology, self-assembly mode and materials surface wettability all could be tuned via isomeride effect in self-assembly system. Interestingly, superhydrophobic surface was formed via the self-assembly of compound G-p in 1,4-dioxane and exhibited very high adsorption capacity for water. This gel system provided new method for modulation self-assembly process in supramolecular field.
研究领域:
材料科学
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超分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
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2021
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IF 9.229
Jianhang Li,Guanbin Gao,Xintong Tang,Meng Yu,Meng He,Taolei Sun
Chemical and physical properties of nanobio interface substantially affect the conformational transitions of adjacent biomolecules. Previous studies have reported the chiral effect and charge effect of nanobio interface on the misfolding, aggregation, and fibrillation of amyloid protein. However, the isomeric effect of nanobio interface on protein/peptides amyloidosis is still unclear. Here, three isomeric nanobio interfaces were designed and fabricated based on the same sized gold nanoclusters (AuNCs) modified with 4-mercaptobenzoic acid (p-MBA), 3-mercaptobenzoic acid (m-MBA), and 2-mercaptobenzoic acid (o-MBA). Then three isomeric AuNCs were employed as models to explore the isomeric effect on the misfolding, aggregation, and fibrillation of Aβ40 at nanobio interfaces. Site-specific replacement experiments on the basis of theoretical analysis revealed the possible mechanism of Aβ40 interacting with isomeric ligands of AuNCs at the nanobio interfaces. The distance and orientation of −COOH group from the surface of AuNCs can affect the electrostatic interaction between isomeric ligands and the positively charged residues (R5, K16, and K28) of Aβ40, which may affect the inhibition efficiency of isomeric AuNCs on protein amyloidosis. Actually, the amyloid fibrillation kinetics results together with atomic force microscope (AFM) images, dynamic light scattering (DLS) results and circular dichroism (CD) spectra indeed proved that all the three isomeric AuNCs could inhibit the misfolding, aggregation and fibrillation of Aβ40 in a dose-dependent manner, and the inhibition efficiency was definitely different from each other. The inhibition efficiency of o-MBA-AuNCs was higher than that of m-MBA-AuNCs and p-MBA-AuNCs at the same dosage. These results provide an insight for isomeric effect at nanobio interfaces, and open an avenue for structure-based nanodrug design target Alzheimer’s disease (AD) and even other protein conformational diseases.
研究领域:
生物化学
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纳米医学
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神经科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2019
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IF 3.218
Huan Liu,Yaru Wang,Huijun Liu,Yuhua Sun,Shiyou Guan
Organic materials have been promising materials for “greener and sustainable” lithium-ion batteries due to lightweight, low cost, flexibility, alternative molecular engineering. Six kinds of aromatic imides with different aromatic and aliphatic diamines based on 3,3′,4,4′-benzophenonetetracarboxylic dianhydride (BTDA) were designed, synthesized and studied as anode materials in rechargeable lithium-ion batteries in this work. Compared with ortho-substituted and meta-substituted phenylenediamine , aromatic imide synthesized by p -phenylenediamine shows excellent electrochemical performance on account of its well-organized structure, which possesses 558 mA h g −1 of discharge capacity after 50 cycles at the current density of 25 mA g −1 . Besides, imides with shorter alkyl chain would help improve the proportion of electrochemical active conjugated carbonyl compounds , leading to higher capacity. Thus, imide-based electrode materials can be designed efficiently by symmetrical and straight chain structure and less inactive part to gain optimum molecular structure, making it a promising alternative anode material for rechargeable lithium-ion batteries.
研究领域:
材料科学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
PROCEEDINGS OF THE COMBUSTION INSTITUTE
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2020
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IF 5.627
Yan Zhang,Bowen Mei,Xiaoyuan Zhang,Siyuan Ma,Yuyang Li
This work reports an experimental and kinetic modeling investigation on the laminar flame propagation of three butylbenzene isomers ( n -butylbenzene, iso -butylbenzene and tert -butylbenzene)/air mixtures. The experiments were performed in a high-pressure constant-volume cylindrical combustion vessel at the initial temperature of 423 K, initial pressures of 1–10 atm, and equivalence ratios ( ϕ ) of 0.7–1.5. The laminar burning velocities of butylbenzene/O 2 /He mixtures were also measured at 423 K, 10 atm and ϕ = 1.5 to provide additional experimental data under conditions that the butylbenzene/air experiments are susceptible of cellular instability. Comparison among the laminar burning velocities of butylbenzenes including both the three isomers investigated in this work and sec -butylbenzene investigated in our recent work [Combust. Flame 211 (2020) 18–31] shows remarkable fuel isomeric effects, that is, iso -butylbenzene has the slowest laminar burning velocities, followed by n -butylbenzene and tert -butylbenzene, while sec -butylbenzene has the fastest laminar burning velocities. A kinetic model for butylbenzene combustion was developed to simulate the laminar flame propagation of butylbenzenes. Sensitivity analysis was performed to reveal important reactions in laminar flame propagation of butylbenzenes, including both small species reactions and fuel-specific reactions. Kinetic effects are concluded to result in the different laminar burning velocities of four butylbenzene isomers. Small species reactions control the laminar flame propagation under lean conditions, which results in small differences of laminar burning velocities. Chain termination reactions, especially fuel-specific reactions, have important contributions to inhibit the laminar flame propagation under rich conditions. The structural features of butylbenzene isomers can significantly affect the formation of some crucial radicals such as methyl, cyclopentadienyl and benzyl radicals under rich conditions, which leads to remarkable fuel isomeric effects on their laminar burning velocities, especially at high pressures.
研究领域:
燃烧学
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化学动力学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Hongmei Qin,Man Liu,Shiyu Qin,Shixian Zhang,Xingnan Zhou,Chenjian Li,Yuhao Wei,Dan Chen,Rong Fan,Shan Wang,Quanling Yang,Chuanxi Xiong,Qing Wang
Developing dielectric polymers with different stereoisomers may provide a novel strategy to improve electrostatic energy storage performance under harsh environments. However, there is still little research about the effect of polymer stereoisomerism on capacitive energy storage so far. Here, we report a new class of cycloaliphatic polynorbornene-imide (PNC) dielectric with two different spatial configurations and demonstrate that flexural configuration significantly improves the energy storage performance at room temperature and high temperature. ENDO-PNC with flexural configuration possesses slightly higher dielectric constant, comparably large bandgap and dramatically improved thermal properties with respect to EXO-PNC with near-planar configuration. Notedly, ENDO-PNC exhibits dramatically inhibited leakage current density and hopping distance, substantially improved activation energy, electrical resistivity and breakdown strength. Consequently, ENDO-PNC exhibits an ultrahigh discharged energy density ( U d ) of 11.10 J/cm 3 , 9.11 J/cm 3 and 6.77 J/cm 3 at 25 °C, 150 °C and 200 °C respectively, as high as 1.4 times, 2.0 times and 2.8 times that of EXO-PNC. Moreover, ENDO-PNC delivers a maximum U d of 6.0 J/cm 3 and 3.3 J/cm 3 above 90 % efficiency respectively at 150 °C and 200 °C, superior to neat polymers and highly competitive in reported polymer composites. The stereoisomerism effect on dielectric energy storage is further demonstrated in other dielectric polymers, revealing this strategy is universally applicable and particularly meaningful to design and exploit polymer dielectrics working under harsh environments.
研究领域:
材料科学
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高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
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2022
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IF 5.089
Changjun Yang,Shuai Xu,Fanchang Peng,Wenyao Zhou,Quan Zhou,Xi Chen,Bingguang Zhang,Kejian Deng
The cis / trans isomeric effects of cobalt thioporphyrazine (CoPz) bearing 1,4-dithiin (A) and bis(butylthio) (B) groups on their photocatalytic performance were investigated by photocatalytic selective aerobic oxidation of 5-hydroxymethylfurfural (HMF) in aqueous solution under simulated sunlight. The results demonstrated that the cis -CoA 2 B 2 consistently showed higher photocatalytic activity than the trans -CoA 2 B 2 , especially in alkaline solution. Meanwhile, the cis -CoA 2 B 2 favored oxidizing HMF to 2,5-furandicarboxylic acid (FDCA), while the trans -CoA 2 B 2 preferred yielding 2,5-diformylfuran (DFF). Under alkaline conditions, the yield of FDCA can reach 73% with a selectivity of 95% in the presence of cis -CoA 2 B 2 after reacting 14 h, while 37% of DFF yield with a selectivity of 81% can be achieved in the presence of trans -CoA 2 B 2 after reacting 12 h. The relationship between the structure of cis / tr ans isomers and their photocatalytic performance was further explored by density functional theory (DFT) calculations. The active species originated from cis -CoA 2 B 2 and trans -CoA 2 B 2 were also examined by trapping experiments.
研究领域:
化学
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材料科学
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催化反应
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）