JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 20
·9403-9414
·
IF 4.682
Fan Lei,Xu Zhilong,Sun Peizheng,An Lanfang,Han Jie,Guo Rong
Bacterial infection is a growing threat to public health worldwide. Ferrous ions have been proved to have good antibacterial properties. However, ferrous ions are easy to be oxidized, which limited its further application. Therefore, the design of nanosystems that can stably release ferrous ions is highly desirable. Here, N-doped hollow carbon nanospheres anchored with Fe 7 S 8 nanosheets (N-HCNs@Fe 7 S 8 ) were synthesized by a hydrothermal method. The particle size, crystal form, and specific surface area of the synthesized composites were characterized. N-HCNs@Fe 7 S 8 can release Fe 2+ ions, which could kill Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ) without using light or H 2 O 2 . Fe 2+ concentration increases with the prolonged soak time of N-HCNs@Fe 7 S 8 , and the antibacterial ability is closely related to Fe 2+ concentration. The Fe 2+ released by N-HCNs@Fe 7 S 8 has a promoting effect on the healing of skin wounds infected with S. aureus . The proinflammatory cytokines (TNF-α and IL-6) were effectively reduced in N-HCNs@Fe 7 S 8 -treated wounds, and N-HCNs@Fe 7 S 8 could effectively inhibit inflammation. Therefore, the Fe 2+ release effect of N-HCNs@Fe 7 S 8 and its good biocompatibility make it a candidate material for antibacterial therapy and promoting wound healing. Graphical abstract
研究领域:
材料科学
·
微生物学
·
医学
✓ 已验证
DOI
高影响因子
POLYMER
·
2020
·
IF 4.231
Chandra Sekhar Biswas,Arpan Biswas,Massimillano Galluzzi,Mehdihasan I. Shekh,Qiao Wang,Biswajit Ray,Pralay Maiti,Florian J. Stadler
The synthesis of amphiphilic block-copolymers of poly( N -isopropylacrylamide) (PNIPAM) and poly( N -acryloyl- l -phenylalanine methyl ester) (PNALPA) by RAFT polymerization is reported. The polymers were characterized by proton NMR ( 1 H NMR), gel permeation chromatography (GPC), powder X-ray diffraction (XRD), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA) to understand their structure-property relationships. All synthesized polymers show pH triggered release at acidic (pH 5) and biological pH (pH 7.4). Critical micellar concentration also varied systematically depending on the amphiphilic nature of the polymers. Biocompatibilities of the polymers are also determined to check their suitability for biomedical applications.
研究领域:
材料科学
·
生物医学工程
·
高分子化学
✓ 已验证
DOI
高影响因子
PROGRESS IN REACTION KINETICS AND MECHANISM
·
2017
·
IF 0.682
Hua Song,Shengnan Li,Hualin Song,Feng Li,Huapeng Cui
A number of Zn–S2O82–/ZrO2–Al2O3 (Zn(x)–SZA) catalysts with different Zn mass fractions were synthesised and characterised by using X-ray diffraction, the Brunauer–Emmett–Teller method, and H2 temperature-programmed reduction. The structure and isomerisation performance of Zn(x)–SZA catalysts were studied using n-pentane as a probe reaction. The results showed that a pure tetragonal ZrO2 phase was formed on Zn(x)–SZA, and the ZrO2 crystallite sizes of the tetragonal phase increased in the order: Zn(0.5)–SZA < Zn(1.0)–SZA < Zn(1.5)–SZA < Zn(2.0)–SZA < SZA. Zn can strengthen the interaction between persulfate ions and the support, promote the formation of stronger acidity, lead to a better dispersion of sulfate ions on the surface, and improve the redox performance of the catalysts. The Zn(1.0)–SZA catalyst exhibited the best catalytic activity for n-pentane isomerisation. At a temperature of 170 °C, a reaction pressure of 2.0 MPa, a molar H2/n-pentane ratio of 4:1, and a weight hourly space velocity of 1.0 h−1, the isopentane yield reached 58.0%.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Zewei Jia,Shangbo Ning,Yuxin Tong,Xin Chen,Huilin Hu,Lequan Liu,Jinhua Ye,Defa Wang
Photothermal reverse water gas shift reaction is one of the promising methods to palliate global energy and environmental issues. Searching for catalysts with high activity and CO selectivity for CO2 conversion has been attracting extensive attention. In this work, Ni nanoparticle-loaded N-doped CeO2 (Ni/N-CeO2) composite catalysts were synthesized using a three-step method. Under light irradiation, the optimal Ni/N5.0-CeO2 exhibited a CO yield rate of 20.9 mmol·gcat–1·h–1 with almost 100% of CO selectivity via photothermal CO2 reduction. As a comparison, Ni/CeO2, without nitrogen doping, showed a high CH4 selectivity. The strong light absorption of Ni/N5.0-CeO2 mainly by loading of Ni nanoparticles and the enhanced adsorption/activation of CO2 molecules due to increased oxygen vacancies in N5.0-CeO2 by N-doping were supposed to account for the excellent catalytic performances. The doping of nitrogen was of particular importance for the formation of N–H bonds, which could modulate the reaction pathway for promoting the reduction of CO2 toward CO while suppressing the undesirable CO2 methanation process.
研究领域:
化学工程
·
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Xinyue Wang,Li Liu,Binbin Jiang,Weiwei Xie,Qingyang Chong,Song Li,Zhiming Chen
The rapid and sensitive detection of hazardous substances is essential for safeguarding human health. This work presented the synthesis of laccase immobilized on N-doped carbon nanonets (N-doped carbon nanonets-lac) biosensor and its application for the photothermal detection of hydroquinone. The N-doped carbon nanonets-lac biosensor demonstrated rapid response and precise detection of hydroquinone in 5 s, along with excellent sensitivity, good tolerance to metal ions and organic compounds, outstanding selectivity, and storage stability. Thanks to the photothermal effect of N-doped carbon nanonets, the N-doped carbon nanonets-lac biosensor was demonstrated as a photothermal biosensor for hydroquinone detection. The N-doped carbon nanonets-lac biosensor exhibits a highly sensitive current response under illumination, with a detection limit as low as 0.14 μM (S/N = 3) and an extensive response range of 1–1000 μM. Furthermore, the N-doped carbon nanonets-lac biosensor showed reliable performance in photothermal analysis of tap and Yangtze River water samples, highlighting its technical effectiveness in detecting contamination of toxic compounds in real water samples.
研究领域:
环境科学
·
生物化学
·
分析化学
✓ 已验证
DOI
高影响因子
AICHE JOURNAL
·
2020
·Vol. 66
·期 11
·e17023
·
IF 3.519
Yaoming Wang,Xiaoli Wang,Haiyang Yan,Chenxiao Jiang,Liang Ge,Tongwen Xu
In this study, cleaner production of N -methylglycine (NMG), N , N -dimethylglycine (DMG), and N , N , N -trimethylglycine (TMG) with similar structures but different methylate groups was performed using bipolar membrane electrodialysis (BMED). The effects of the feed mass concentration and current density on the separation performance were intensively analysed in terms of the molecular size, molecular structure, ion concentration, and interaction between amino acids and membranes. The results indicated that the optimal recovery performance was achieved at a current density of 200 A/m 2 and feed mass concentration of 6%. Under the optimal conditions, the energy consumption and current efficiencies were 2.3 kWh/kg and 78% for NMG, 2.49 kWh/kg and 69.5% for DMG, and 3.52 kWh/kg and 39.6% for TMG, respectively. It was speculated a competition for water splitting occurs between the bipolar membranes and anion exchange membranes when BMED is used for the separation and purification of large-sized bioproducts.
研究领域:
生物工程
·
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2023
·Vol. 25
·期 8
·1-10
·
IF 2.5
Cui Wei,Fang Jiahui,Wan Yuanyuan,Tao Xueyu,Guo Litong,Feng Qiyan
In this study, Fe–N co-doped carbon nanotubes (Fe–N-CNTs) were prepared and used to activate peroxymonosulfate (PMS) for advanced oxidation removal of Rhodamine B (RhB). The XRD, XPS, SEM and EDS results revealed that the Fe, N, O co-doped carbon nanotubes (Fe–N-CNTS) coated with FeO(OH) nanosheets were successfully synthesized by a simple pyrolyzing process. The large BET specific surface area (286.42 m 2 /g) and hybrid pore structure of micropores and mesopores (3–10 nm) of the Fe–N-CNTS ensured its good RhB degradation performance (98% in 30 min) by activatting PMS. The Fe–N-CNTS-1.5 had the best degradation performance, which could be attributed to the synergy effect between FeO(OH) nanosheets and Fe–N-CNTS. The 1 O 2 , O 2 •, •OH and SO 4 −• were formed during the PMS activating process and involved in the RhB degradation. The reaction constant of 0.5483 min −1 could be obtained by adding 1.5 mM PMS, which is about 12 and 24 times of the reaction constant of PMS only (0.0458 min −1 ) and FeN-CNTS only (0.0226 min −1 ), respectively. This work provides new insight into the mechanism of PMS activation by carbon-based catalysts for the efficient degradation of RhB.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2013
·Vol. 4
·期 12
·6048-6054
·
IF 2.562
Zhiqiang Jie,Xiufang Yan,Lianhong Zhao,Shelby Davis Worley,Jie Liang
An effective macroporous cross-linked antimicrobial polymeric resin containing N-halamine and quaternary ammonium salt moieties was synthesized in an eco-friendly and economical way. Commercially available macroporous crosslinked chloromethylated polystyrene (CMPS) resin reacted with the salt of 5,5-dimethylhydantoin (DMH) and trimethylamine (TMA) in water to produce a polymeric resin containing hydantoinyl and quaternary ammonium salt moieties, poly(p-methylstyrene)-3-(5,5-dimethylhydantoin)-co-trimethyl ammonium chloride (PSHTMA). The hydantoinyl groups in PSHTMA were converted to an antimicrobial N-halamine structure by a facile chlorination reaction in dilute NaOCl solution. The as-synthesized antimicrobial polymeric resin (Cl-PSHTMA) was characterized by FT-IR, X-ray photoelectron spectroscopy, and zeta-potential measurement. The antimicrobial tests showed that the as-synthesized antimicrobial polymeric resin was capable of 7-log inactivation of S. aureus and 8-log inactivation of E. coli within 1 minute contact time. Moreover, the N-halamine moieties in Cl-PSHTMA exhibited excellent regenerability.
研究领域:
材料科学
·
微生物学
·
环境科学
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2019
·
IF 4.914
Hao Wang,Xiaohao Liu,Guangyue Xu,Ziwei Guo,Ying Zhang
ABSTRACT Owing to Fe being the most abundant and least expensive transition metal on the earth, the utilization of Fe-based catalysts for catalytic hydrogenation has attracted worldwide attention. In this work, a series of N-doped C supported Fe catalysts (Fe-N-C) were prepared by co-pyrolysis of cellulose and ferric chloride under ammonia atmosphere. Characterization methods such as elemental analysis, atomic absorption spectroscopy, nitrogen adsorption-desorption isotherms, transmission electron microscopy, high-resolution transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy were carried out to explore the physicochemical properties of the catalysts. Using hydrogenation of nitrobenzene as a model reaction, the catalysts prepared at different pyrolysis temperatures displayed different activities. Fe-N-C-700 exhibited the best activity among these catalysts, with the yield of aniline being up to 98.0% under 5 MPa H 2 at 120 °C after 12 h. Combined with the results of catalyst characterization and comparative tests, the transformation of Fe species and the generation of N-doped C, especially graphitized N-doped C, in the catalyst may be the main factors affecting the activity. A kinetic study was carried out and the apparent activation energy was obtained as 31.53 kJ/mol. The stability of the catalyst was also tested and no significant decrease in the activity was observed after 5 runs.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
SYNTHESIS-STUTTGART
·
2023
·Vol. 55
·期 20
·3393-3401
·
IF 2.6
Yue-Lu Zhu,Jie Yan,Xiu-Xuan Xu,Zong-Yu Sun,Jiao Chen
Copper-catalyzed coupling reaction involving N-phenoxyacetamides and 2H-azirines is described, in which N–O and C–N bonds are broken and restructured. This protocol provides an efficient strategy for the highly regioselective synthesis of racemic α-amino oxime ethers. In addition, this strategy can be used to modify natural products and is gram-scale compatible.
研究领域:
有机化学
·
合成化学
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 8
·1-9
·
IF 5.833
Gao Wenjie,Bai Yu,Liu Huwei
Protein glycosylation plays pivotal role in a variety of biological processes and has association with many diseases. The highly efficient glycopeptide enrichment is essential for the mass spectrometry–based glycoproteome research to reduce interference from non-glycopeptides. In this study, novel glutathione-functionalized two-dimensional cobalt sulfide nanosheets (Co-S@Au-GSH) were synthesized for rapid and highly effective enrichment of glycopeptides. By using this nanomaterial, 34 and 21 N-glycopeptides were effectively captured from human serum immunoglobulin G (IgG) and horseradish peroxidase (HRP) digests, respectively. In addition, the Co-S@Au-GSH showed remarkable performance in N-glycopeptide extraction with high selectivity (HRP: BSA = 1:500), low limit of detection (0.5 fmol/μL), high binding capacity (150 mg/g), good reusability, and great robustness. Moreover, it was successfully applied in complex serum samples, demonstrating its excellent enrichment performance. These results indicated that this nanomaterial has great potential in complicated practice samples in glycoproteome determination. Graphical abstract
研究领域:
蛋白质组学
·
生物化学
·
分析化学
✓ 已验证
DOI
PubMed
高影响因子
POLYMER INTERNATIONAL
·
2014
·Vol. 64
·期 4
·563-570
·
IF 2.247
Yi-Ling Huang,Jing Cao,Wei Hu,Sai Liang
Novel optically
active anionic initiators bearing a chiral oxazole substituent on the fluorene ring, ( S )-1-(9H-fluoren-2-yl)-4-isopropyl-4,5-dihydrooxazole lithium (Li-( S )-1-FIDH) and ( S )-2-(9H-fluoren-2-yl)-4-isopropyl-4,5-dihydrooxazole lithium (Li-( S )-2-FIDH), were prepared. Anionic homopolymerizations of achiral N -substituted maleimide (RMI) with the chiral initiators were investigated. The optically active polymers obtained were attributed to asymmetric induction of the chiral initiators. The very crowded chiral initiator Li-( S )-1-FIDH was found to play a better asymmetric induction role in the polymers than Li-( S )-2-FIDH. Anionic copolymerization of ( R )-(+)- N -1-phenylethyl maleimide and optically inactive RMI with Li-( S )-1-FIDH were also studied. © 2014 Society of Chemical Industry
研究领域:
高分子化学
·
有机化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）