AMB Express
·
2023
·Vol. 13
·期 1
·1-8
·
IF 3.7
shi Shi,Cheng Yutong,Wang Shuai,Zhang Xiangmei,Han Fubo,Li Xiaojing,Dong Huijun
Nonomuraea gerenzanensis ( N. gerenzanensis ) is known for its ability to biosynthesize A40926, the precursor of the glycopeptide antibiotic (GPA) Dalbavancin. However, challenges and uncertainties related to the genetic manipulation of the rare actinomycetes remain. In order to improve the conjugation transfer of N. gerenzanensis , the crucial factors affecting conjugal transfer were evaluated, including agar medium, mycelial state, donor-recipient ratio, magnesium ion concentration, and antibiotic coverage time firstly. Additionally, γ-butyrolactone (GBL) for quorum sensing (QS) and antibiotics targeting bacterial walls were applied to evaluate their effects on conjugation transfer. As a result, the optimal conditions of 5%TSB of liquid medium, 24 h of the period time, V0.1 of agar medium, 30 mM of magnesium ion, the ratio 10:1 of donor-to-recipient, and 27 h of the overlaying time of antibiotic were determined. Furthermore, the results showed that autoinducer GBL and GPA teicoplanin had a synergetic effect on the conjugation transfer of N. gerenzanensis at a working concentration of 60 µM and 0.5 µg mL −1 , respectively. The highest conjugation efficiency could reach about 1.3 depending on the optimal process conditions and the interference of QS and antibiotics.
研究领域:
微生物学
·
分子生物学
·
遗传学
·
生物化学
·
生物技术
·
抗生素研究
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DOI
高影响因子
WATER AIR AND SOIL POLLUTION
·
2024
·Vol. 235
·期 2
·1-18
·
IF 3.8
Deng Yu,Chen Jingfan,Xiao Zhidan,Liu Jiaying,Zhang Jie,Zhu Bingqi,You Xiaotong,Ni Fuquan,Ao Tianqi,Tan Yanping
N self-doped porous biochars (KBCs) were synthesized through high-temperature carbonization and KHCO 3 activation using chicken feathers as biomass. Subsequently, it was employed for the remediation of tetracycline hydrochloride (TC)-contaminated water and soil. The properties of KBCs were analyzed by various characterization techniques. The results verified that KBC 800-2 exhibited outstanding specific surface area (1648.89 m 2 g −1 ) and pore volume (0.806 cm 3 g −1 ). The maximum adsorption capacity of KBC 800-2 for TC was 147.8 mg g −1 , which was superior to that of raw biochar (15.5 mg g −1 ). The results of pseudo-second-order and Freundlich indicated that the process was dominated by chemisorption. Moreover, the adsorption capacity of KBC 800-2 was stable over a wide pH range of 3–12 and high coexisting ionic strength. The consequences proved that the enhancement of pore filling effect and π-π electron interactions between TC and N self-doped adsorbent were the predominant driving forces to improve the adsorption efficiency of TC. Notably, compared to T50 (soil and 50 mg kg −1 TC), the properties of organic carbon, total nitrogen, and sucrase, urease, and catalase activities in TKBC 800-2 (soil, 50 mg kg −1 TC, and 2% KBC 800-2 ) were increased by 108.57%, 4.98%, 886.08%, 89.52%, and 78.08% respectively. KBC 800-2 as a low-cost and highly effective adsorbent for antibiotic pollution has enormous application potential. Graphical
研究领域:
环境科学
·
材料工程
·
化学工程
·
污染修复
·
吸附技术
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DOI
高影响因子
Nano Research
·
2024
·Vol. 17
·期 6
·4753-4763
·
IF 9.5
Yin Leilei,Zhang Shuai,Sun Mingzi,Wang Siyuan,Huang Bolong,Du Yaping
Currently, dual atomic catalysts (DACs) with neighboring active sites for oxygen reduction reaction (ORR) still meet lots of challenges in the synthesis, especially the construction of atomic pairs of elements from different blocks of the periodic table. Herein, a “rare earth (Ce)-metalloid (Se)” non-bonding heteronuclear diatomic electrocatalyst has been constructed for ORR by rational coordination and carbon support defect engineering. Encouraging, the optimized Ce−Se diatomic catalysts (Ce−Se DAs/NC) displayed a half-wave potential of 0.886 V vs. reversible hydrogen electrode (RHE) and excellent stability, which surpass those of separate Ce or Se single atoms and most single/dual atomic catalysts ever reported. In addition, a primary zinc-air battery constructed using Ce−Se DAs/NC delivers a higher peak power density (209.2 mW·cm −2 ) and specific capacity (786.4 mAh·g Zn −1 ) than state-of-the-art noble metal catalysts Pt/C. Theoretical calculations reveal that the Ce−Se DAs/NC has improved the electroactivity of the Ce−N 4 region due to the electron transfer towards the nearby Se specific activity (SA) sites. Meanwhile, the more electron-rich Se sites promote the adsorptions of key intermediates, which results in the optimal performances of ORR on Ce−Se DAs/NC. This work provides new perspectives on electronic structure modulations via non-bonded long-range coordination micro-environment engineering in DACs for efficient electrocatalysis.
研究领域:
材料科学
·
催化
·
电化学
·
纳米技术
·
能源存储与转换
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 3
·964-977
·
IF 3.5
Zhu Q.,Wei S.,Wang C.,Yang X. B.,Zhou B.,Xie Z. X.,Duan Z. Q.,Hu Y. M.
Unique wool-ball shaped nanocrystalline CoS was synthesized using solvothermal method in which dopamine (DA) was added as carbon source to combine with the CoS. The DA in situ polymerized and coated on the CoS particle surfaces during the solvothermal process. N, S co-doped carbon-encapsulated CoS(Co 9 S 8 ) were achieved after a post carbonization. In the composites, CoS(Co 9 S 8 ) nanocrystals and carbon are tightly bound and embedded into the amorphous carbon layer to form a spherical core–shell structure. Hybrid counter electrodes (CEs) fabricated with the product have good conductivity, dispersion and stability due to the synergetic effect between carbon and nanocrystalline CoS(Co 9 S 8 ). Charge transfer through the CE/electrolyte interfaces is improved by dopamine-carbon combination. In the optimal case, PCE of 8.82% of the dye-sensitized solar cells (DSSCs) with the hybrid CEs was achieved, which is close to that of the cell with Pt (8.86%) CE, and is a 41.12% increase compared with that of CoS CE cell with the structure of photoanode/N719/electrolyte (I − /I 3 − )/CE. Moreover, stability of the cells with the composite CEs was greatly improved. The results demonstrate that the as-prepared composites are promising alternatives to Pt-CEs for high-performance DSSCs. The reported preparation method will guide further developments in highly efficient carbon-based catalysts for electrochemistry and energy related applications.
研究领域:
材料科学
·
能源技术
·
电化学
·
纳米技术
·
太阳能电池
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DOI
高影响因子
JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2024
·Vol. 32
·期 7
·3195-3207
·
IF 4.7
Xie Shuang,Yu Dawei,Yao Jiahong,Wei Zhimei,Wang Xiaojun,Yang Jie
Furan semi-aromatic polyamides have become a biobased substitute for existing petrochemical semi-aromatic polyamides and received more and more attention. In this study, a series of high-performance biobased furan polyamides with different diamine chain lengths (Poly(butylene furanamide) (PA4F), Poly(pentylene furanamide) (PA5F), Poly(hexamethylene furanamide) (PA6F), Poly(octamethylene furanamide) (PA8F) and Poly(dodecamethylene furanamide) (PA12F)) were successfully prepared; Except for PA4F, other resins could be synthesized by one step bulk polymerization. Meanwhile, the effect of diamine chain length was studied. Except for PA4F they were amorphous which was confirmed by IR, XRD and DSC analysis. PA12F to PA5F had high weight-average molecular weights ( M w ) ranging from 34,000 to 65,500 g/mol, number-average molecular weight ( M n ) ranging from 6100 to 26,300 g/mol, glass transition temperature ( T g ) ranging from 89 to 138 ℃ and temperature of decomposition at 5% mass loss ( T d-5% ) from 357 to 408 ℃. The T g of PA4F reached as high as 142 ℃. The tensile strength of PA12F, PA8F and PA5F was obtained for the first time, and reached up to 45, 62 and 84 MPa, respectively. The tensile strength of PA6F was also high at 74 MPa. The α relaxation temperatures of PA12F to PA5F were also high, up to 107, 136, 146 and 158 ℃, respectively.
研究领域:
高分子化学
·
材料科学
·
生物基材料
·
大分子化学
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DOI
高影响因子
Acta Metallurgica Sinica-English Letters
·
2022
·Vol. 36
·期 1
·167-176
·
IF 3.024
Wang Wei,Guan Mingyu,Wang Qinghua,Chen Yangyang,Chen Liang,Yin Hong,Zhu Yucan,Li Gangyong,Hou Zhaohui
ZnS is a promising material for lithium-ion battery anodes due to its abundant natural resources, simplicity of synthesis, and high theoretical lithium storage capacity. However, it needs to be optimized for its low conductivity and volume effect during the charge–discharge process. The traditional method of combining with carbonaceous materials is usually laborious, and the required sulfuration process may possibly result in the destruction of materials morphology. In this study, hybrid materials formed by the combination of ZnS nanocrystals and high porosity carbon fibers were synthesized by one-step electrospinning using zinc diethyldithiocarbamate and polyacrylonitrile as raw materials and poly (ethylene glycol)—block-poly (propylene glycol)—block-poly (ethylene glycol) as template. The method is simple and avoids the influence of sulfuration process on the morphology of materials. The composite presents a specific capacity of 592.2 mAh g −1 under a current density of 1 A g −1 after 1000 cycles. The porous structure significantly decreases the diffusion mean-free path of Li + and inhibits the volume effect associated with the lithium storage process of ZnS. In addition, the 3D cross-linked carbon fibers improve the conductivity of materials. This study can serve as an inspiration for the development of other lithium storage composites.
研究领域:
材料科学
·
纳米技术
·
储能
·
电化学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 11
·4533-4547
·
IF 3.5
Ben Zixiang,Zhu Zhiwei,Pu Jin,Xu Fugang
In this work, a composite ZnO/MoS 2 /AuNPs supported on carbon fiber cloth (CFC) was prepared by progressively growing ZnO nanorods array, MoS 2 nanosheets and AuNPs on CFC for sensitive SERS detection and efficient photocatalytic degradation of organic dye pollutants. The ZnO/MoS 2 heterojunctions showed a significant CM effect and further decorating AuNPs with EM effect improved the detection limit of crystal violet (CV) from 10 –6 to 10 –13 M. The composite can be used for qualitative SERS detection of CV or Nile blue in standard solution or real samples with high stability and good stability. The enhancement mechanisms of CFC/ZnO/MoS 2 and CFC/ZnO/MoS 2 /AuNPs were discussed based on corresponding characterizations and calculations. The composite also showed efficient photocatalysis for dye degradation. The ZnO/MoS 2 heterojunction played a key role in enhancing the charge separation rate and improving the photocatalytic performance. The materials achieved degradation efficiencies of 71.4% for CV (1.5 × 10 –5 M) after 60 min irradiation under visible light. The active radical species were investigated and possible degradation approach were proposed. Such composite with both SERS enhancement and visible light photodegradation ability has great promise in environment monitoring and remediation. Graphical
研究领域:
纳米技术
·
环境科学
·
材料科学
·
分析化学
·
光催化
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 8
·3573-3584
·
IF 3.5
Xu Man,Luo Yongping,Zeng Linsheng,Huang Ping,Xu Shunjian,Liu Yike,Wang Yongya,Li Xianchang,xie Yu
In consideration of the increased activity of Pt-based catalysts for methanol oxidation in direct methanol fuel cells, it is necessary to apply an ideal support in the construction of Pt-based catalyst for methanol oxidation. In this study, Ag/g-C 3 N 4 nanosheets (Ag/GCNN) nanocomposites with different Ag contents were synthesized and used as the progressive support to construct Pt/Ag/GCNN catalyst. As a nitrogen-rich polymeric semiconductor, GCNN is easily coordinated with various metals. The introduction of Ag nanoparticles can improve the electrical conductivity of the catalyst and cooperate with Pt for optimizing the performance of electrocatalytic oxidation of methanol. The electrochemical experiment results demonstrated that Pt/Ag/GCNN has higher electrocatalytic activity and stability for methanol oxidation than Pt/GC and Pt/GCNN. The mass activity of Pt/Ag/GCNN-0.6 (18.66 mA mg Pt −1 ) is 7.07, 4.60 and 1.26 times that of Pt/GCNN (4.06 mA mg Pt −1 ), Pt/Ag/GCNN-0.4 (4.06 mA mg Pt −1 ) and Pt/Ag/GCNN-0.8 (14.76 mA mg Pt −1 ) at the forward peak potential. The J f / J b ratio of Pt/Ag/GCNN-0.6 is 3.31, which is bigger than that of Pt/GCCN (2.62), Pt/Ag/GCNN-0.4 (2.69), and Pt/Ag/GCNN-0.8 (2.56). A suitable mechanism was proposed to explain that Ag/GCNN supported Pt catalyst can improve the CO toxicity resistance and electrocatalytic performance. Based on the coordination of GCNN, Ag was first modified to form a support, and then the remaining coordination sites were used to support Pt. It provided a new strategy for the design of catalysts for methanol electrooxidation. Graphical abstract
研究领域:
材料科学
·
电化学
·
催化
·
纳米技术
·
能量转换
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2010
·Vol. 16
·期 1
·75-82
·
IF 1.821
Yin Huanshun,Zhou Yunlei,Han Ruixia,Qiu Yanyan,Ai Shiyun,Zhu Lusheng
Hydroxylapatite (HAP)-modified glassy carbon electrode (GCE) was fabricated and used to investigate the electrochemical oxidation behavior of 2,4-dinitrophenol (2,4-DNP) by cyclic voltammetry, differential pulse voltammetry, and chronocoulometry. The oxidation peak current of 2,4-DNP at the modified electrode was obviously increased compared with the bare GCE, indicating that HAP exhibits a remarkable enhancement effect on the electrochemical oxidation of 2,4-DNP. Based on this, a sensitive and simple electrochemical method was proposed for the determination of 2,4-DNP. The effects of HAP concentration, accumulation time, accumulation potential, pH, and scan rate were examined. Under optimal conditions, the oxidation peak current of 2,4-DNP was proportional to its concentration in the range from 2.0 × 10 −6 to 6.0 × 10 −4 M with a correlation coefficient of 0.9987. The detection limit was 7.5 × 10 −7 M ( S / N = 3). The proposed method was further applied to determine 2,4-DNP in water samples with recoveries from 96.75% to 106.50%.
✓ 已验证
DOI
高影响因子
Science China-Materials
·
2024
·Vol. 67
·期 8
·2661-2670
·
IF 6.8
Peng Wenhong,Liu Changfei,Xu Chenhui,Qin Congyao,Qin Ningpu,Chen Huipeng,Guo Tailiang,Hu Wenping
The large-scale fabrication and patterning of artificial perceptual systems are vital for the development of bionic systems. Traditional patterning processes are often constrained by the use of mask versions, which are not only expensive but also challenging to produce on a large scale. Inkjet printing technology with maskless patterning capability is well suited for current demands for large-scale preparation and patterning. However, the application of printing techniques is typically confined to the production of simple devices or the preparation of patterned active layers within more complex devices. In this study, we successfully fabricated fully inkjet-printed indium gallium zinc oxide (IGZO) memristor arrays to mimic artificial nociceptor (pain receptors). By integrating a layer of silver into the all metal-oxide indium tin oxide (ITO)/IGZO/ITO memristor, we achieved stable threshold switching characteristics, a large current switching ratio of 10 5 , excellent switching durability of 10 4 cycles scans, and excellent spatial uniformity. We investigated the Ag-based conductive filament conduction mode and mimic LIF characteristics (leaky, integrate and fire), demonstrating the potential of the memristor as an artificial neuron. Lastly, we successfully implemented artificial nociceptor, including “threshold fire”, “relaxation”, “non-adaptation”, and “sensitization”, leveraging the stable threshold switching properties of the device. Our work demonstrates the significant potential of inkjet printing technology in the realization of bionic systems.
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DOI
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2018
·Vol. 28
·期 5
·2069-2079
·
IF 1.754
Wang Shuo,Zhang Zhaofu,Zhang Qihai,Li Lifang
Injectable and thermosensitive poly( N -isopropylacrylamide) (PNIPA)/nano-hydroxyapatite (nano-HA) composite hydrogels were synthesized by physical crosslinking of N -isopropylacrylamide with nano-HA as cross-linker to improve the mechanical property of hydrogels and avoid the use of chemical cross-linker. Internal morphology, thermosensitive, rheological, swelling, and hemocompatibility properties of the prepared hydrogels were investigated. The PNIPA/HA composite hydrogels had a phase transition from sol to gel, and the lowest critical solution temperature was about 32.5 °C. The PNIPA/HA composite hydrogels had regular pore structures and the nano-HA dispersed well throughout the network. Differential scanning calorimetry and thermogravimetric analysis showed that the addition of nano-HA had no significant effect on the LCST and thermal stability of the PNIPA/HA hydrogels. When the temperature was above 32.5 °C, the storage modulus ( G′ ) and complex viscosity increased with the increasing nano-HA content. All PNIPA/HA composite hydrogels possessed the thinning behavior. The PNIPA/HA hydrogels exhibited a good water absorption capacity and the swelling ratio decreased with the increasing nano-HA content. As revealed by biocompatibility results, PNIPA/HA composite hydrogels were considered to be a non-hemolytic biomaterial. Therefore, PNIPA/HA hydrogels can be used as injectable materials for the potential applications of science and technology, such as tissue engineering scaffolds.
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DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2024
·Vol. 130
·期 12
·898
·
IF 2.5
Shen Kuo,Zhang Ruiting,Jin Yahong,Li Yanmei,Hu Yihua
Semiconductor oxides are widely used in the field of optical materials due to their broad spectral response, tunable structure, low cost, high chemical and thermal stability, among other advantages. The design and fabrication of photochromic materials in semiconductor oxides have shown tremendous potential in various fields such as optoelectronic displays, optical storage, and light-stimulated responses. In this work, we have designed and fabricated a novel inorganic photochromic material by doping Sm 3+ ions into the semiconductor oxide CaBiNb 2 O 9 (CBN). The introduction of Sm 3+ ions induces the formation of oxygen vacancies and cationic vacancies in CBN, greatly enhancing the photochromic effect of the matrix. CaBiNb 2 O 9 : Sm 3+ (CBN: Sm) can achieve reversible photochromic response through 254 nm light irradiation and 350 ℃ thermal stimulation, and exhibit excellent stability and fatigue resistance. The photochromic process and performance of the CBN: Sm materials were characterized, and the potential mechanisms were analyzed and discussed. The conducted research and insights will provide support for other researchers in the design and fabrication of photochromic materials based on semiconductor oxides.
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DOI
高影响因子
危险品化学品经营许可证（带存储）