BIOMACROMOLECULES
·
2022
·
IF 6.978
Hou Liu,Yubin Feng,Songtian Che,Lin Guan,Xinting Yang,Yue Zhao,Linan Fang,Andrei V. Zvyagin,Quan Lin
Spinal cord injury (SCI) generally leads to long-term functional deficits and is difficult to repair spontaneously. Many biological scaffold materials and stem cell treatment strategies have been explored, but very little research focused on the method of combining exogenous neural stem cells (NSCs) with a biodegradable conductive hydrogel scaffold. Here, a NSC loaded conductive hydrogel scaffold (named ICH/NSCs) was assembled by amino-modified gelatin (NH2-Gelatin) and aniline tetramer grafted oxidized hyaluronic acid (AT-OHA). Desirably, the well-conducting ICH/NSCs can be simply injected into the target site of SCI for establishing a good electrical signal pathway of cells, and the proper degradation cycle facilitates new nerve growth. In vitro experiments indicated that the inherent electroactive microenvironment of the hydrogel could better manipulate the differentiation of NSCs into neurons and inhibit the formation of glial cells and scars. Collectively, the ICH/NSC scaffold has successfully stimulated the recovery of SCI and may provide a promising treatment strategy for SCI repair.
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JOURNAL OF POLYMER SCIENCE
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2022
·Vol. 61
·期 6
·491-502
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IF 3.046
Lidong Cao,Xingzhong Fang,Guofei Chen
High imidization temperature of polyimides (PIs) brings great restriction to the applications in electronic industry. In this study, N,N ′-carbonyldiimidazole (CDI), a novel low-temperature imidization accelerator with the unique dual function of catalyst and dehydrating agent, was researched to solve this problem. PIs synthesized from 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) and 4,4′-oxydianiline were researched as the main object on method A and method B, two preparation methods of PIs, by introduction of CDI, which was found that the PIs prepared by method A achieved complete imidization and basically had no residual CDI and N,N -Dimethylacetamide at 180 °C under vacuum, while the completely imidized PIs prepared by method B were also obtained at 40 °C. Even prepared at low temperature, the PI films with adding CDI both showed satisfactory thermal and mechanical properties, especially in reducing coefficient of thermal expansion. In addition, the universality of the reaction between CDI and poly(amic acid) were also verified by other soluble PI systems. All these results prove the superior performance of CDI in lowering imidization temperature, showing great potentials in low-temperature cured PIs. Graphical
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Advanced Science
·
2022
·Vol. 9
·期 36
·2204949
·
IF 17.521
Yichao Huang,Wenbo Zhou,Weichao Kong,Lulu Chen,Xiaolong Lu,Hanqing Cai,Yongrui Yuan,Lianming Zhao,Yangyang Jiang,Haitao Li,Limin Wang,Lin Wang,Hang Wang,Jiangwei Zhang,Jing Gu,Zhuangjun Fan
The development of low-cost, high-efficiency, and stable electrocatalysts for hydrogen evolution reaction (HER) under alkaline conditions is a key challenge in water electrolysis. Here, an interfacial engineering strategy that is capable of simultaneously regulating nanoscale structure, electronic structure, and interfacial structure of Mo 2 N quantum dots decorated on conductive N-doped graphene via codoping single-atom Al and O (denoted as AlO@Mo 2 N-NrGO) is reported. The conversion of Anderson polyoxometalates anion cluster ([AlMo 6 O 24 H 6 ] 3− , denoted as AlMo6) to Mo 2 N quantum dots not only result in the generation of more exposed active sites but also in situ codoping atomically dispersed Al and O, that can fine-tune the electronic structure of Mo 2 N. It is also identified that the surface reconstruction of Al OH hydrates in AlO@Mo 2 N quantum dots plays an essential role in enhancing hydrophilicity and lowering the energy barriers for water dissociation and hydrogen desorption, resulting in a remarkable alkaline HER performance, even better than the commercial 20% Pt/C. Moreover, the strong interfacial interaction (Mo N bonds) between AlO@Mo 2 N and N-doped graphene can significantly improve electron transfer efficiency and interfacial stability. As a result, outstanding stability over 300 h at a current density higher than 100 mA cm −2 is achieved, demonstrating great potential for the practical application of this catalyst.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2022
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IF 4.831
Shuangying Li,Qingxiang Zhou,Zhi Li,Menghua Liu,Yanhui Li,Chunmao Chen
2,4-Dinitroaniline is a multifunctional product and has been applicated in various fields. It has absorbed much concerns due to its large consumption and occurrence in many environmental matrices. It is urgent to explore reliable and sensitive measurement technology. Present study described an outstanding fluorescence sensor constructed with carbon dots (CDs) derived from vitamin B 1 . The CDs were fabricated by dealing with a facile hydrothermal process, and exhibited good water solubility, fluorescence stability and highly fluorescence quenching characteristics in presence of 2,4-dinitroaniline. The excitation and emission wavelengths of the obtained CDs were 305 and 378 nm, respectively. The sensor displayed good selectivity and sensitivity for 2,4-dinitroaniline. Good linearity can be achieved in two-stage of 0.2–3 μmol L −1 and 3–20 μmol L −1 . The sensor earned low detection limit for 2,4-dinitroaniline down to 0.05 μmol L −1 . The sensor has been commendably employed for analysis of 2,4-dinitroaniline in real aqueous samples with spiked recoveries in the range of 95.0–99.6%. The proposed sensor provided a promising alternative for analysis of environmental pollutants or other meaningful employment.
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ENERGY & FUELS
·
2022
·
IF 4.654
Xuesong Shan,Keru Song,Fengyue Shi,Dongyu Zhao
Copper nanoparticles are uniformly supported on acidified carbon nanotubes (CNTs/Cu NPs) by a mild liquid-phase reduction method without surfactants or bridging molecules. The surface of copper nanoparticles is smooth without impurities. Then, polystyrene (PS) microspheres are prepared by emulsion polymerization and composited with CNTs/Cu NPs (CNTs/Cu NPs/PS). Nanocopper/carbon nanotubes as the core and polyaniline as the shell were prepared via situ polymerization as a core–shell structure (PANI@CNTs/Cu NPs/PS). At a high temperature, the PS cracks and eliminates materials, forming porous structures, and the polyaniline is carbonized, realizing nitrogen doping of the material (NCMP). The results indicated that the acidified carbon nanotubes played a crucial role in the synthesis procedure, achieving consistent growth of copper on carbon nanotubes. The size of evenly dispersed copper nanoparticles is about 5–15 nm. When NCMP is applied as an electrode material, it demonstrates excellent electrochemical performance as a high-performance supercapacitor.
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JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 42
·19936-19945
·
IF 4.682
Zhang Jing,Yao Qingyun,Tang Shuangmei,Yang Chao,Liu Qifan,Zang Limin,Qiu Jianhui
Flexible linear aqueous zinc-ion hybrid supercapacitors are considered as ideal materials for flexible and wearable electronic devices due to their advantages of safety, high flexibility and good wearable ability. Materials based on shape memory can satisfy the needs of fatigue resistance and deformation recovery, and have great advantages in the assembly of flexible wearable devices. In this paper, aqueous zinc-ion hybrid supercapacitor with shape-memory function was assembled by using PANI/NiTi shape-memory alloy wire as the cathode electrode and flexible zinc wire as the anode electrode. The device can be bent into different angles from 0° to 180°, after repeated bending for 200 times and heating to its deformation temperature, the original shape can still be restored, and the capacitance retention rate is up to 90%, with good mechanical resistance. By assembling with flexible zinc wire, the potential window can be expanded to 1.6 V, and the energy density has been greatly improved. Its energy density can reach 55.9 Wh kg −1 at 3 A g −1 , which greatly improves its energy density and has great development potential in flexible and portable electronic devices.
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JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Mingxue Li,Pijun Duan,Yanru Huo,Jinchan Jiang,Yuxin Zhou,Yuhui Ma,Zhehui Jin,Qiong Mei,Ju Xie,Maoxia He
Recent research revealed inhibition or enhancement of dissolved organic matter (DOM) to the degradation of trace organic contaminants (TrOC) in natural and engineered water systems. Phenols containing acetyl, carboxyl, formyl, hydroxy, and methoxy groups were selected as the model DOM to quantitatively study their roles in the degradation of simple anilines, sulfonamide antibiotics, phenylurea pesticides by sulfate radicals (SO 4 • − ). Experimental results found that p -methoxyphenol inhibited aniline and sulfamethoxazole degradation by thermally activated peroxydisulfate (TAP), while p -acetylphenol slightly promoted aniline degradation. Quantum chemical calculations were applied to study the microscopic mechanism and kinetics of phenols affecting the degradation of aniline pollutants (AN) in three ways: competitively reacting with SO 4 • − , repairing aniline cationic radicals (AN • + ) and phenylaminyl radicals (AN(-H) • ), and generating phenoxy radicals to degrade anilines. Generally, the degradation of sulfonamides and phenylureas prefer to be inhibited by hydroxy- and methoxy-phenols with low oxidation potential ( E ox ), due to their diffusion-limiting reaction with SO 4 • − and rapid back-reduction AN • + with the calculated rate constants of (0.02 − 6.38) × 10 9 M −1 s −1 . Phenols repairing AN(-H) • through H abstraction reaction is speculated to possibly dominate the joint degradation of phenols and anilines by TAP, which has a poor correlation with E ox . This study provides mechanistic insight into the chemical behavior of complex and heterogeneous DOM in complex aqueous environments.
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MARINE POLLUTION BULLETIN
·
2023
·
IF 5.8
Kunpeng Wang,Liju Tan,Yuewei Zhang,Dongmei Zhang,Na Wang,Jiangtao Wang
P-nitrophenol (4-NP) is the most persistent and highly toxic species among nitrophenol. In this work, a novel fluorescent probe for the detection of 4-NP in aqueous environment was constructed by combining the carbon dots (CQDs) with excellent optical properties and the molecularly imprinted polymer (MIP) with favorable selectivity . The CQDs were synthesized by hydrothermal method using citric acid hydrate as carbon source and o -phenylenediamine as surface modifier, then the molecularly imprinted polymers coating on the CQDs (MIP@CQDs) were obtained by sol-gel imprinting process. The fluorescence quenching of MIP@CQDs is the results of internal filtration effect and dynamic quenching when they encounter with 4-NP. The probe is suitable for the quantitative detection of trace 4-NP in actual aqueous samples, such as tap water , wastewater and seawater, with satisfying recoveries from 95.1 % to 107.8 %, wide detection linear ranges between 0 and 144 μmol/L, low detection limit of 0.41 μmol/L and high selectivity. The detection results are consistent with those of the HPLC method. This work provides a simple, rapid and effective fluorescent detection method for trace 4-NP in aqueous environment.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2023
·
IF 3.8
Chen Chen,Qiong Tang,Hong Xu,Mingxing Tang,Xuekuan Li,Lei Liu,Jinxiang Dong
Naphthenic base oil is an important lubricating base oil and very scarce in the global petroleum resources. Herein, a series of alkylated tetralin fluids similar to naphthenic base oils were produced by the alkylation of tetralin and α -olefins ( n -hexene, n -octene, n -decene) with ionic liquid Et 3 NHCl/AlCl 3 as the catalyst, where the applied raw materials are totally derived from the coal chemical industry. The product composition could be controlled by adjusting the feeding ratio of tetralin and olefin. The synthetic fluids were evaluated as lubricating base oils to reveal the structure–property correlations. Their principal physicochemical and tribological properties depend on the chain-length of α -olefins and the number of alkyl groups onto the aromatic rings. Bis-(octyl- or decyl-) alkyl tetralin exhibited good properties in terms of viscosity, thermo-oxidation stability and pour point, as well as friction-reducing and anti-wear performance, showing great potential for producing naphthenic base synthetic oils from coal-based chemicals.
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ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Tianfang Yang,Ye Chen,Miao Tian,Xupo Liu,Fengxian Zhang,Jing Zhang,Kun Wang,Shuyan Gao
ABSTRACT Heteroatom doping is considered as an effective approach that manipulates the local bonding environment to improve the electroactivity of Fe-N/C catalysts. Herein, the oxidation polymerization-pyrolysis approach is applied to fabricate the uniformly F-doped porous Fe-N/C catalysts (F-FeNC) through utilizing 4-fluoroaniline as a “self-doping” precursor with N and F elements simultaneously. The synergistic effect between ligand trapping and long-range interaction of F atoms provides high density of Fe-N x active sites. The F-FeNC catalyst demonstrates superior ORR performance in alkaline media with a positive half-wave potential ( E 1/2 ) of 0.82 V, low H 2 O 2 yield of ∼3.4% and rapid 4e − transfer process. The liquid-state Zn-air battery (ZAB) assembled with F-FeNC catalyst as air cathode delivers excellent rate capability, power density (141 mW cm −2 ), specific capacity (760 mAh g − 1 ) and long-term cycle durability over 120 h. Moreover, the as-assembled all-solid-state ZAB shows excellent cycle stability at 0°∼180° bending conditions, revealing great prospects in flexible electronic device applications. Engineering the electronic structure of active sites via F self-doping provides an insightful route for designing multi-heteroatom doped Fe-N/C catalysts.
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Polymer Chemistry
·
2023
·Vol. 14
·期 6
·754-762
·
IF 4.6
Lei Zhang,Yujie Liang,Jiazhu Xu,Hong Zheng,Wenjie Sun,Yonghong Cheng
1,3-Benzoxazine has long been considered as a unique polymerizable benzoxazine species to prepare high performance polymers. Herein, polymerization of 2H,4H-3,1-benzoxazine is observed for the first time and the thermal properties of the obtained material are studied. A phenolic hydroxyl-containing mono-functional 3,1-benzoxazine monomer has been synthesized. With additional phenol substitution, 3,1-benzoxazine is able to undergo ring-opening polymerization. The reaction kinetics and variation in the molecular structure during polymerization were systematically investigated. Besides, quantum chemistry simulation showed that the C–O and C–N bond strength reduction in the 3,1-oxazine ring induced by adjacent phenol substitution is the critical factor that endows the monomer with polymerization ability. A polymerization mechanism of 3,1-benzoxazine has been proposed. The reported 3,1-benzoxazine monomer has good evaporation resistance even at 200 °C for 2 hours. More importantly, the cured material shows attractive thermal performance, with a glass transition temperature of 217 °C and a decomposition temperature above 400 °C together with a char yield of 54%. This study offers a new way to develop polymerizable benzoxazines with high performance for numerous emerging applications.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Junqing Chen,Zhaodong Zhu,Hui Zhang,Shiyu Fu
Biomass-based multifunctional electromagnetic shielding materials have attracted extensive interest in academia and industry due to the sustainability of biomass and the environmental adaptability of multifunctional materials. After removing lignin and hemicellulose wood become a porous substrate with aligned cellulose , which is a good platform for building cellulose-based materials. In this work, a cellulose composite with sandwich-like structure was constructed by in-situ polymerization of aniline on delignified wood and coating a PDMS/CNT layer. Benefiting from the natural porous hierarchical structure and the constructed multilayer continuous conductive network, the PDMS/CNT/PANI WA exhibits excellent electrical conductivity (18.6 S/m) and electromagnetic shielding performance (shielding efficiency value of 26 dB at the X band (8.2–12.4 GHz)). The synergistic effect of PANI and CNT endowed the material with excellent flame retardancy (HRR, THR and HRC decreased by 84 %, 53.4 % and 83.3 %) and significant antibacterial activity . Moreover, PDMS imparts a water contact angle of 105° to the material, which acts as a protective layer, further improves the durability of the material. This work provides a new strategy for developing sustainable and multifunctional electromagnetic shielding materials.
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