Journal of Macromolecular Science Part A-Pure and Applied Chemistry
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2014
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IF 0.74
Yan Xue,Dafu Wei,Anna Zheng,Yong Guan,Huining Xiao
Cationic star polymers as drug/gene carriers have attracted increasing attention. Herein, environmental sensitivities and star-shaped architecture were combined into a well-defined gene carrier system, and further amphiphilic modification was conducted. The thermo- and pH-sensitive behaviors of poly[N,N-(dimethyl amino)ethyl methacrylate] (PDMAEMA) star polymers before and after amphiphilic modification in aqueous solutions were investigated. The observed lower critical solution temperature (LCST) increased with increasing arm length due to the increase of hydrophilicity. A significant decrease of the LCSTs with increasing pH and ionic-strength of the solution was found. The incorporation of MMA and BA lipophilic moieties decreased the LCST of the cationic star polymer due to enhanced hydrophobic interaction. As a potential gene carrier, the performance of star polymers on binding DNA was primarily evaluated via particle size, zeta potential, and gel retardation measurements. All the complexes formed stable small particles with diameter of 100∼150 nm at N/P ratio higher than 3.0. The electrostatic screening effect and facilitation for the interaction of complexes with cell membrane induced by the incorporation of lipophilic units were expected to enhance the gene transfection efficiency.
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COMPOSITES PART B-ENGINEERING
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2022
·
IF 11.322
Kailei Ding,Cheng Zheng,Xueyu Huang,Li Yang,Yang Lei,Yunbing Wang
Bioprosthetic heart valve thrombosis (BHVT) is no longer considered a rare clinical entity in recent years and could cause valve motion abnormalities, which requires reoperation. Currently reported modifications of bioprosthetic heart valves (BHVs) mainly focused on improving the anti-calcification property. However, it was hard to improve their anti-thrombogenicity and crosslinking efficiency at the same time. Here we reported a method that combines improved hemocompatibility , crosslinking efficiency, cytocompatibility, and anti-calcification property for BHVs. Porcine pericardia (PPs) and 2-amino-4-pentanoic acid (APA) were first co-crosslinked with glutaraldehyde to introduce allyl moieties to the PPs, then poly(N, N-dimethylacrylamide) (PDMAA) was covalently immobilized on PPs through radical polymerization . In vitro and in vivo studies demonstrated that the structural stability of PDMAA modified PPs was much superior than that of traditional glutaraldehyde crosslinked PPs (GA). The PDMAA modified PPs exhibited enhanced antithrombogenic performance with a 75% decrease of platelet adhesion compared with GA. Moreover, the calcium content accumulated on the modified PPs after 90-day rat subcutaneous implantation decreased 93.5% compared with that on GA. The PDMAA modified PPs may alleviate BHVT and calcification, offering a potential option for BHVs fabrication in the future.
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ChemNanoMat
·
2020
·Vol. 7
·期 1
·34-43
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IF 3.384
Lihua Cao,Huiling Li,Zhaoxiu Xu,Ruirui Gao,Suqing Wang,Guoying Zhang,Shaohua Jiang,Wenhui Xu,Haoqing Hou
Graphical An integrated carbonization, activation, and nitrogen-doped process is applied to fabricate hierarchical porous carbon materials with controllable N content as electrode for supercapacitors. The symmetric supercapacitor delivers an energy density of 13.3 W h kg −1 (6 KOH) and 20 W h kg −1 (1 M Na 2 SO 4 ). Biomass-derived carbon materials are an amazing electrode material for supercapacitor, owing to their abundant, porous structure and composition. Herein, a controllable N content carbon material with hierarchical porous structure was fabricated via an integrated carbonization, activation and nitrogen-doping process. N-rich camellia pollen is used as carbon precursor, while NH 4 Cl is employed as both activation agent and dopant. The optimal N-doped carbon with higher N content (3.82 at%), suitable pore size distribution and larger specific surface area (810 m 2 g −1 ), provides abundant ion transport channels and exposes more accessible active sites. Thus, a high specific capacitance of 280 F g −1 (1 A g −1 ) in 6 M KOH (three-electrode system) can be obtained with making full use of N−HPC-1. Moreover, the assembled symmetrical supercapacitor delivers high energy densities both in 6 M KOH (13.3 Wh kg −1 ) and 1 M Na 2 SO 4 (20 Wh kg −1 ) that can be used for LED lighting. More than that, it is also demonstrates excellent cycle stability in 6 M KOH (85.4% after 20000 cycles at 20 A g −1 ). In view of the above-mentioned merits, this N-doped hierarchical porous carbon is anticipated to be a promising material for application in supercapacitors and other fields.
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JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
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2020
·Vol. 35
·期 1
·99-106
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IF 0.64
Su Junzhang,Wu Xiangfeng,Zhang Chenxu,Wang Hui,Zhang Mi,Zhang Jiarui,Jia Yunning,Cui Yanan,Tong Xin,Shang Jialu,Zhang Chenyu
The CdS/ spherical g-C 3 N 4 n-n heterojunction photocatalyst was fabricated via a solvothermal method. The tetracycline was used to characterize the photocatalytic properties of the as-developed hybrids. The photocatalytic degradation mechanism of the as-developed heterojunction photocatalyst was also analyzed. Research results show that CdS nanoparticles are well dispersed in the surface layer of spherical g-C 3 N 4 . Moreover, the mass ratio of CdS to spherical g-C 3 N 4 will influence the photocatalytic activity of the asdeveloped composites, which shows the trend of first increasing and then decreasing as it increased. When the mass ratio is 7:1, in 25 min, the as-developed heterojunction shows 93.2 % of the maximum photocatalytic efficiency and still exhibits 83.6 % after 5 times cycle testing. Moreover, the as-developed hybrids can accelerate the electron transport and improve the separation efficiency of photo-generated carriers compared with pure samples. In addition, the holes and superoxide radicals are dominating active species during the photocatalytic degradation process.
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COLLOID AND POLYMER SCIENCE
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2020
·Vol. 298
·期 6
·619-628
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IF 1.536
Zhang Huijuan,Niu Chao,Zhang Yanan,Wang Xue,Yang Biao
Fabrication of a pH-responsive hydrogel with good mechanical strength is highly desirable in applications such as sensors and tissue engineering. In this work, a polyvinyl alcohol (PVA)/poly(2-( N , N ′-dimethyl amino) ethyl methacrylate) (PDMAEMA)-poly (acrylic acid) (PAAc) hydrogel was produced via a double-network (DN) protocol, in which PDMAEMA-PVA semi-interpenetrating hydrogel was constructed as the first network by the polymerization and crosslinking of PDMAEMA, and then AAc was polymerized in presence of the first network to form a polyion complexation as the second network. The DN PVA/PDMAEMA-PAAc hydrogel exhibited satisfactory mechanical strength which depended significantly on the crosslinking density of the first layer of the network. An optimal tensile strength of 0.45 MPa and compressive strength of 1.2 MPa can be obtained for DN hydrogel, and the compressive strength was 480% higher than that of the single-network hydrogel. The DN hydrogel also showed a pH-responsive swelling behavior and the equilibrium swelling ratio was controlled by both of the DMAEMA and AAc moieties in the network. Considering the wide potential applications of stimuli-responsive hydrogels, the present strategy is of highly practical value for broadening the application scope of the hydrogels.
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CHEMICAL PHYSICS LETTERS
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2019
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IF 1.901
Zhuo Zhou,Haiming Xu,Dongya Li,Zhongwei Zou,Dongsheng Xia
La(OH) 3 /BiOCl n-n heterojunction (BCL) was successfully fabricated by facile microwave technique. Photocatalytic performance experiments confirmed that BCL-20 can degrade 20 mg/L tetracycline hydrochloride (TC-HCl) about 85% in 60 min, which is 2 and 0.5 times higher than that of BiOCl and La(OH) 3 , respectively. The photocatalytic mechanism reveals that the co-effect of oxygen vacancies (OVs) and rebuilt internal electric field induced by heterostructure not only broaden the light-responsive range but also augment the separation efficiency of photogenerated carriers, thus improving the photocatalytic properties of BCL. This work provides a new avenue for improving the photocatalytic performance of Bi-based photocatalysts by heterojunction and OVs.
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BIOORGANIC & MEDICINAL CHEMISTRY
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2015
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IF 2.793
Dongmei Zhao,Honglei Xie,Changlin Bai,Chunchi Liu,Chenzhou Hao,Shizhen Zhao,Hongli Yuan,Changqun Luo,Jian Wang,Bin Lin,Jiang Zheng,Maosheng Cheng
A series of N , N -3-phenyl-3-benzylaminopropanamide derivatives were identified as novel CETP (cholesteryl ester transfer protein) inhibitors. In our previous study, lead compound L10 was discovered by pharmacophore-based virtual screening (Dong-Mei Zhao et al., 2014). Based on L10 (IC 50 8.06 μM), compound HL6 (IC 50 10.7 μM) was discovered following systematic structure variation and biological tests. Further optimization of the structure–activity relationship (SAR) resulted in N , N -3-phenyl-3-benzylaminopro panamides derivatives as novel CETP inhibitors. They were synthesized and evaluated against CETP by BODIPY-CE fluorescence assay . Among them, HL16 (IC 50 0.69 μM) was a highly potent CETP inhibitor in vitro. In addition, HL16 exhibited favorable HDL-C enhancement and LDL-C reduction in vivo by hamster. The molecular docking of HL16 into the CETP was performed. The binding mode demonstrated that HL16 occupied the CETP binding site and formed interactions with the key amino acid residues.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
·
IF 15.1
Guojuan Qu,Peng Jia,Tao Zhang,Shuai Tang,Md. Nahid Pervez,Yixiong Pang,Bin Li,Chengjin Cao,Yaping Zhao
Doping nonmetallic heteroatoms into carbonaceous materials is a proven strategy for enhancing peroxymonosulfate (PMS) activation in the degradation of endocrine-disrupting compounds (EDCs). Understanding the role of heteroatom doping defects and intrinsic defects (topological, vacancies, or edge defects) on PMS activation is crucial for designing more efficient carbon catalysts. Herein, we synthesized nitrogen (N) and phosphorus (P) co-doped carbon microspheres (NPCs) through the pyrolysis of aminophosphonic acid resin (D418) precursors and utilized them to activate PMS for bisphenol A (BPA) degradation. The pyrolysis temperature was found to regulate the type and degree of defects, as well as the configuration of N and P. NPC-1000 (pyrolysis temperature at 1000 °C) exhibited the highest reaction rate constant ( k ) (1.20 × 10 −1 min −1 ) with the lowest N and P doping defects and the highest intrinsic defect intensity resulting from the removal of N and P during pyrolysis. Density functional theory (DFT) calculations and correlation analysis between defect sites and k suggest that the adsorption of PMS was facilitated by graphitic N-coordinated C and intrinsic defect sites rather than P doping defect sites, resulting in the degradation of BPA through electron transfer and radical mechanisms, specifically superoxide radicals (O•–2). Excess halide anions led a significant increase of k with only a limited formation of trichloromethane (TCM) (disinfection byproducts) in presence of 100 mM Cl − . This research offers fundamental insights into constructing intrinsic defects through regulating heteroatom configuration, intending to enhance the catalytic activity of metal-free materials.
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ChemSusChem
·
2023
·
IF 8.4
Jiaji Zhang,Gaobo Lin,Jie Zhu,Sifan Wang,Wenhua Zhou,Xiangzhou Lv,Bolong Li,Jianghao Wang,Xiuyang Lu,Jie Fu
Graphical We find that the N-doped Ni particles can enhance the adsorption of CO 2 and modulate the configuration of adsorbed CO on Ni-N-C sites. As a result, the optimal catalyst can efficiently convert CO 2 into CO with a faradaic efficiency of 96.7 % and a current density of 500 mA cm −2 in a strongly acidic electrolyte. Electro-chemically reducing CO 2 in a highly acidic medium is promising for addressing the issue of carbonate accumulation. However, the hydrogen evolution reaction (HER) typically dominates the acidic CO 2 reduction. Herein, we construct an efficient electro-catalyst for CO formation based on a core-shell structure, where nitrogen-doped Ni nanoparticles coexist with nitrogen-coordinated Ni single atoms. The optimal catalyst demonstrates a significantly improved CO faradaic efficiency (FE) of 96.7 % in the acidic electrolyte (pH=1) at an industrial-scale current density of 500 mA cm −2 . Notably, the optimal catalyst maintains a high FE of CO exceeding 90 % (current density=500 mA cm −2 ) in the electrolyte with a wide pH range from 0.67 to 14. In-situ spectroscopic characterization and density functional theory calculations show that the local electron density of Ni-N-C sites is enhanced by N-doped Ni particles, which facilitates the formation of *COOH intermediate and the adsorption of *CO. This study demonstrates the potential of a hybrid metal/Ni-N-C interface in boosting acidic CO 2 electro-reduction.
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JOURNAL OF CHEMICAL THERMODYNAMICS
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2023
·
IF 2.6
Weijie Jia,Yuqi Su,Songtao Cao,Ao Dong,Ying Zhang,Maogang He
Mutual diffusion coefficients of three alkanes (n-heptane, n-octane and isooctane) in cyclohexane were measured by digital holographic interferometry under atmospheric pressure. The measured temperature points were 288.15 K, 298.15 K and 308.15 K, respectively and the mass fraction of the measured solution range was from 0.05 to 0.95. The extended relative uncertainty of the measurement system was estimated to be less than 2.4%. The dependence of mutual diffusion coefficient on temperature and solution concentration was studied. The mutual diffusion coefficients of these three binary mixtures increase with the increase of temperature and have a nearly linear relationship with the solution concentration. And the image processing process of holographic interference image is introduced in detail. Zhang et al .’s model, Darken model and Vignes model were used to predict the mutual diffusion coefficients of the three binary mixtures, the absolute average of relative deviations (AARDs) are 2.97%, 3.89% and 6.18%, respectively and Zhang et al .’s model is the one with the best agreement among the three models.
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Polymers
·
2023
·Vol. 15
·期 8
·1861
·
IF 5
Jihang Hu,Xiaoqing Wang
As the only renewable resource among the four basic materials (steel, cement, plastic, wood), wood itself and wood products have a “low carbon” value and play an important role in storing carbon. The moisture absorption and expansion properties of wood limit its application scope and shorten its service life. To enhance the mechanical and physical properties of fast-growing poplars, an eco-friendly modification procedure has been used. This was accomplished by the in situ modification of wood cell walls by vacuum pressure impregnation with a reaction of water-soluble 2-hydroxyethyl methacrylate (HEMA) and N,N’-methylenebis(acrylamide) (MBA). The anti-swelling efficiency of HEMA/MBA-treated wood was improved (up to 61.13%), whereas HEMA/MBA-treated wood presented a lower weight-gain rate (WG) and water-absorption rate (WAR). It was observed that the modulus of elasticity, hardness, density, and other properties of modified wood had improved significantly, as indicated by XRD analysis. Modifiers diffuse primarily within cell walls and cell interstices of wood, causing crosslinks between the modifiers and the cell walls, reducing its hydroxyl content and blocking the channels for water movement, thereby enhancing its physical properties. This result can be obtained by scanning electron microscopy (SEM) and energy dispersive x-ray spectroscopy (EDX), Nitrogen adsorption test imaging ATR-FTIR (Attenuated total reflection-Fourier-Transform Infrared) Spectroscopy, and nuclear magnetic resonance (NMR) and Nitrogen adsorption test. Overall, this straightforward, high-performance modification method is crucial for maximizing wood’s efficiency and the sustainable development of human society.Keywords:wood modification;reaction mechanism;cell walls;grafting;properties
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SENSORS AND ACTUATORS B-CHEMICAL
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2023
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IF 8.4
Ning Sui,Yifeng Xu,Peng Zhang,Shuang Cao,Tingting Zhou,Tong Zhang
The crucial challenge to exploit effective ozone (O 3 ) gas sensors lies in developing novel functional sensing materials to meet the requirement of trace-level detection threshold (50 ppb). Metal oxide semiconductors (MOSs) with controllable heterogenous composites as high-performance sensing layers are expected to break through this bottleneck. This work proposes the hybridization of MIL-68 (In) and ZIF-8, which are employed as dual metal organic frameworks (MOFs) sacrificial templates to design n-n heterostructures . The derived In 2 O 3 backbone showed a hexagonal prismatic structure with a large aspect ratio. The robust architecture enabled the uniform decoration of mass of ZnO nanoparticles (NPs) on the surfaces without the damage of high porosity for the gas diffusion. Consequently, the optimal sensor with appropriate ZnO NPs loading amount exhibited trace O 3 detection ability as low as 15 ppb, which was attributed to the smart design of n-n heterostructure, rich active sites and improved oxygen-adsorbing capacity. Thus, this work inspires a new way to utilize the versatile dual MOFs template for constructing heterogenous composites as O 3 sensing materials.
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