INORGANICA CHIMICA ACTA
·
2015
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IF 2.046
Li Liu,Changhua Liu,Ling Nie,Ting Jiang,Jing Hong,Xiaomei Zhang,Liehong Luo,Xiaolan Wang
A series of zirconium alkyl-N,N-dimethylenephosphonate silver-carrying (Ag-ZRDP) were successfully prepared and their potential applications as synergistic antibacterial materials were investigated. Silver nanoparticles (Ag NPs), of 30 nm in diameter, were tightly anchored onto the zirconium alkyl-N,N-dimethylenephosphonate (ZRDP), increasing the antibacterial activity of the Ag NPs due to a decrease in the extent of nanoparticle aggregation. Due to the synergistic antibacterial effect of the Ag NPs and ZRDP, the Ag-ZRDP showed a better antibacterial activity than Ag NPs and ZRDP with a minimal inhibition concentration (MIC) of 0.25 and 0.25 μg mL −1 against Escherichia coli and Staphylococcus aureus , respectively. Additionally, the Ag-ZRDP did not show obvious cytotoxicity against mammalian cells (A549 cells), even at a concentration of 256 μg mL −1 . Collectively, these properties make the newly synthesized Ag-ZRDP potentially superior as disinfectants and antiseptics for various biomedical and biotechnological applications.
研究领域:
材料科学
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微生物学
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生物医学工程
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DOI
高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Zhuoning Cao,Chengqiang Li,Hong Jiang,Francesco Secundo,Xiangzhao Mao
β- N -acetylhexosaminidases garnered attention in the enzymatic synthesis of lacto- N -triose II (LNT2) as the backbone precursor of human milk oligosaccharides (HMOs). In this study, β- N -acetylglucosaminidases Hex(Sv)-2557 from Streptomyces violascens ATCC 27968 was engineered based on a stabilizing intermediate strategy to improve its transglycosylation activity for LNT2 synthesis. A mutant Hex(Sv)-2557(D297K) with a transglycosylation activity of 38.4 U/mg with p NP-GlcNAc −1.9-fold higher than that of Hex(Sv)-2557– was obtained and characterized. Instead, the hydrolase activity of the mutant was 73 % lower compared to the wild-type enzyme. Importantly, the mutant can use N -acetyl chitobiose (GlcNAc 2 ) as the donor for LNT2 synthesis. The LNT2 yield of 14.85 % was obtained when the synthetic reaction, catalyzed by the mutant Hex(Sv)-2557(D297K), started from whey powder and GlcNAc 2 -prepared from chitin by chitinase ChiA and ChiB. This study has altered the donor for the action by directed modification and promoting the high-value utilization of whey powder and chitin.
研究领域:
生物化学
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酶工程
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食品科学
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产品关联
DOI
PubMed
高影响因子
Catalysts
·
2018
·Vol. 8
·期 5
·188
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IF 3.465
Dalei Sun,Kaihong Xie,Yanxiong Fang,Xianghua Yang
One-pot synthesis ofN,N′-dialkylureas were successfully achieved from catalytic carbonylation of aliphatic primary amines with CO2as the carbon source and Y0.08Zr0.92O1.96mixed oxide (Yttria-stabilized zirconia, YSZ-8) as the heterogeneous catalyst. The yield of the target product was obtained up to 80.60% from a 48 h reaction with an aliphatic primary amine and 3.0 MPa CO2inN-methyl-2-pirrolidinone at 160 °C. A multi-pronged mechanistic study was carried out where factors that might influence the reaction efficiency were studied, including catalyst structure, substrates basicity, CO2pressure, solvent polarity and reaction time. The presence of oxygen vacancies in YSZ-8 was found to be essential for the carbonylation process by creating additional reduction potential for the activation of CO2which would lead to the key intermediate species.Keywords:Y0.08Zr0.92O1.96mixed oxide;N,N′-dialkylurea;carbonylation;CO2;heterogeneous catalysis
研究领域:
催化化学
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环境科学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2011
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IF 2.13
Jun Li,Mingwei Zhao,Liqiang Zheng
The wormlike micelles formed by surface active N -alkyl- N -methylpyrrolidinium bromide ionic liquids (ILs) have been investigated in aqueous solution. The typical rheological parameters and the viscoelastic properties of wormlike micelles were characterized by rheological measurements and cryogenic-transmission electron microscopy (cryo-TEM). The typical rheological parameters were further evaluated by Maxwell model and the viscoelastic properties were discussed based on the living polymer model. Cryo-TEM images confirmed the formation of wormlike micelles in aqueous solution. The effect of the hydrocarbon chain length of the ILs on the wormlike micelles formation was also studied.
研究领域:
化学
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材料科学
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生物学
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产品关联
DOI
高影响因子
SYNTHETIC COMMUNICATIONS
·
2022
·
IF 1.937
Jinchen Yang,Ling Chen,Yibo Dong,Jinli Zhang,Yangjie Wu
ABATRACTA direct approach to N,N′-disubstituted urea/thiourea from the self-condensation reactions of isothiocyanates in water has been developed. This access tolerated a wide range of functional groups on the aromatic ring, providing a practical and environment-friendly process to N,N′-disubstituted urea/thiourea in moderate to excellent yields from safe and easily available starting materials. A plausible mechanism of the desulfurization self-condensation reaction for urea was also proposed and the role of di-tert-butyl peroxide (DTBP) and copper catalyst in the present strategy was demonstrated with the help of ESI mass spectrometry of intermediate studies.
研究领域:
有机化学
·
绿色化学
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DOI
高影响因子
MOLECULES
·
2021
·Vol. 26
·期 22
·6849
·
IF 4.412
Yan Fan,Tao Wang,Yinwei Qiu,Yinli Yang,Qiubo Pan,Jun Zheng,Songwei Zeng,Wei Liu,Gang Lou,Liang Chen
Graphene p-n junctions have important applications in the fields of optical interconnection and low–power integrated circuits. Most current research is based on the lateral p-n junction prepared by chemical doping and other methods. Here, we report a new type of pure graphene oxide (pGO) vertical p-n junctions which do not dope any other elements but only controls the oxygen content of GO. The I–V curve of the pGO vertical p–n junction demonstrates a remarkable rectification effect. In addition, the pGO vertical p–n junction shows stability of its rectification characteristic over long-term storage for six months when sealed and stored in a PE bag. Moreover, the pGO vertical p–n junctions have obvious photoelectric response and various rectification effects with different thicknesses and an oxygen content of GO, humidity, and temperature. Hall effect test results show that rGO is an n–type semiconductor; theoretical calculations and research show that GO is generally a p–type semiconductor with a bandgap, thereby forming a p–n junction. Our work provides a method for preparing undoped GO vertical p–n junctions with advantages such as simplicity, convenience, and large–scale industrial preparation. Our work demonstrates great potential for application in electronics and highly sensitive sensors.Keywords:undoped p–n junction;vertical p–n junction;graphene oxide
研究领域:
材料科学
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电子工程
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产品关联
DOI
PubMed
高影响因子
CHEMICAL PHYSICS LETTERS
·
2023
·
IF 2.8
Lingling Sun,Baoshan Sun,Yawen Zhou,Bingying Zhang,Fan Zhang,Hongqin Liu,Baocai Xu
In this paper, three N-myristyol amino acid surfactants were synthesized by methyl myristate method. The structures were characterized by MS, FTIR and 1 HNMR. The surface/interface, foam, emulsification and decontamination property were studied and compared with N-lauryol amino acid sodium . The results showed that the order of foam property was SMTr > SMTy > SMP, the order of emulsification was SMP > SMTr > SMTy. The presence of phenolic hydroxyl group and indolyl group, surface/interfacial and foam property increased and emulsification property decreased. N-myristyol amino acid sodium had better surface/interface, emulsification and foam property, while the decontamination property was lower than that of N-lauryol amino acid sodium.
研究领域:
化学
·
材料科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Linsen Li,Zhuwei Yang,Xiao Yang,Hui Xiong,Zhao Jiang,Tao Fang
Liquid organic hydrogen carriers (LOHCs) are considered as promising candidates for large-scale hydrogen storage, which offers significant advantages in terms of hydrogen storage density, ease of storage and transportation. NPhCZ (N-phenylcarbazole)/18H-NPhCZ (perhydro-N-phenylcarbazole) is proposed as a typical system with high hydrogen storage capacity. However, low dehydrogenation activity and selectivity of catalysts restrict the cyclic efficiency of hydrogen storage. In this study, the efficient catalysts are designed by the immobilization of ultrafine, highly dispersed Pd nanoparticles onto Ni, N co-doped carbon materials through wet chemical reduction. The Pd/Ni@NC-10 catalyst exhibits the highest catalytic performance with 100 % conversion, 81.9 % selectivity of NPhCZ and 6.48 wt% hydrogen release amount. Combined with XRD, HRTEM, Raman, XPS, H 2 -TPR, N 2 physisorption characterization methods and DFT calculations, it is found that the doped Ni, N species could synergistically increase the dispersion of loaded Pd nanoparticles, as well as regulate the electronic state around Pd, which in turn accelerates the rate of the rate-limiting step. The evident interaction between Pd nanoparticles and Ni, N co-doped carbon brings the enhancement of dehydrogenation efficiency. Besides, the spent catalysts are measured by XRD, TEM, XPS and evaluated for the dehydrogenation reaction, indicating that Pd/Ni@NC-10 shows good structural stability, durability and recyclability. It provides practical guidance for the design of LOHCs dehydrogenation catalysts.
研究领域:
材料科学
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催化化学
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2017
·
IF 2.323
Bing Jia,Chao Zhang,Kun Xin,Yingmin Yu,Qingsong Li
Liquid–liquid equilibrium (LLE) data for the water + N,N-dimethylacetamide + solvents (chloroform, methyl isobutyl carbinol, methyl isobutyl ketone, isopropyl acetate, or isopropyl ether) ternary systems were determined at 308.2 and 298.2 K and at 101.3 kPa. Distribution coefficients and separation factors were calculated to evaluate the effectiveness of extracting N,N-dimethylacetamide from aqueous solution. The Othmer–Tobias equation and the Hand equation were used to confirm the reliability of the experimental LLE data. The experimental data were correlated by thermodynamic nonrandom two-liquid and universal quasichemical models, and the binary interaction parameter values were obtained from the data correlation.
研究领域:
化学工程
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物理化学
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产品关联
DOI
高影响因子
Soft Matter
·
2024
·Vol. 20
·期 37
·7448-7456
·
IF 2.9
Cuihong Ma,Cong Du,Qing Bo Tong,Xin Ning Zhang,Miao Du,Qiang Zheng,Zi Liang Wu
Incorporating associative interactions as the energy dissipation units has been recognized as an effective strategy to develop tough hydrogels. For hydrogen-bond associations, however, it is highly challenging to stabilize them under aqueous conditions. Although affording cooperativity can enhance and stabilize the hydrogen bonds, it usually requires stepwise polymerization to form these cooperative associations between different polymers and networks. Here, we report a series of tough supramolecular hydrogels with robust hydrogen-bond associations between grafted polymers that are synthesized by polymerization of a macromonomer of poly(N,N-dimethylacrylamide) (PDMAA) and a small monomer of methacrylic acid. The grafted chains of PDMAA form cooperative hydrogen bonds with the main chain of poly(methacrylic acid) (PMAAc), forming supramolecular hydrogels with high toughness and good stability. The tough and stiff hydrogels are in a glassy state, exhibit forced elastic deformation at room temperature, and remain stable over a wide pH range. In contrast, hydrogels prepared by the copolymerization of DMAA and MAAc are swollen and weak in water due to the lack of successive hydrogen donor/acceptor units and the absence of cooperative hydrogen bonds. In addition, these tough hydrogels exhibit good recyclability and shape memory properties, owing to the supramolecular nature of the network and the temperature-dependent mechanical properties. The influence of polymer structure on the associative interactions and macroscopic properties of the hydrogels should be informative for the design of tough soft materials with versatile applications.
研究领域:
材料科学
·
化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2020
·
IF 5.065
Chunying Zhu,Xiaojie Liu,Taotao Fu,Xiqun Gao,Youguang Ma
The densities and viscosities of the binary solutions EAE (2-(Ethylamino) ethanol) + H 2 O, DMEA ( N -dimethylethanolamine) + H 2 O, EAE + DMEA and ternary solution EAE + DMEA + H 2 O were measured at T = (293.15–333.15) K. Furthermore, the excess molar volume , partial molar volume , apparent molar volume, limiting partial molar volume and viscosity deviation were calculated. Based on the volumetric properties and viscosity properties of the solutions, the solute-solute and solvent-solute interactions were analyzed.
研究领域:
物理化学
·
溶液化学
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2017
·
IF 2.323
Dong-Fang Zhao,Li-Sheng Wang,Jian Sun,Chuan-Ming Chen
A phosphorus flame retardant named N,N′-piperazinebis(neopentylglycol)phosphoramidate (PBNGP) was synthesized and characterized by elemental analysis, Fourier transform infrared spectroscopy, mass spectra, and nuclear magnetic resonance. Its thermal properties were evaluated via thermogravimetric analysis and differential scanning calorimetry. The solubilities of PBNGP in selected solvents at T = (293.15 to 333.15) K and atmospheric pressure were measured via a static-analytic method. The experimental data were correlated with Scatchard–Hildebrand, Buchowski-Ksiazczak, Wilson, nonrandom two liquid, and universal quasichemical equations. The calculated results showed that all of these models can reproduce the experimental data well, and the Wilson model gives the best correlation, with an overall relative standard deviation of 0.70%. The solubility parameter of PBNGP was calculated using the Scatchard–Hildebrand methodology.
研究领域:
化学
·
材料科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）