MATERIALS LETTERS
·
2016
·
IF 2.437
Qing Xiang,Daixiong Zhang,Jirao Qin
Boron carbide (B 4 C) coating having potential in application of cermet , armor materials, and wear-resistant components have attracted considerable attention due to its excellent properties, such as high melting point, high hardness, high neutron absorption, low density, and good chemical stability. In this study, the nano-B 4 C coatings have been successfully fabricated by the electrophoretic deposition (EPD) method in a solvent of isopropyl alcohol containing Polyethyleneimine (PEI). The electrophoretic B 4 C coating was sintered at 1000 °C for 6 h under a constant flow of argon. The electrophoretic coating was characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis, and the result indicates that B 4 C coating is of good film characteristics after sintering. Furthermore, the influence of addition amount of PEI on the EPD kinetics of the nano-B 4 C was investigated in detail. The results show that the optimal addition of PEI would vary with the suspension concentration of nano-B 4 C. Generally speaking, the needed addition amount of PEI for sufficiently modifying the surface charging of nano-B 4 C would increase with the amount of nanoparticles in suspension. This work demonstrates that EPD method is a facile and effective approach in the preparation of B 4 C coatings for potential applications.
研究领域:
材料科学
·
表面工程
✓ 已验证
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 20
·4802
·
IF 4.2
Donghua Dong,Jilai Zhan,Guoxing Liao,Tong Zhu,Qianqian Yu,Wei Zhang,Linge Wang
The challenge of producing polymer vesicles remains difficult, despite numerous attempts to modulate the kinetics of polymer vesicle budding and achieve precise control over the membrane characteristics. An innovative approach that incorporates the use of copolymer-loaded single-emulsion droplets is proposed to address this challenge. This method enables the precise manipulation of micelles and polymer vesicles’ composition, structures and dimensions. The emulsion contracts and forms microspheres when the copolymer concentrations exceed > 0.5 wt%, resulting in the formation of nano polymer vesicles. Conversely, the copolymer spontaneously forms micro polymer vesicles and micelles through vesicle budding at lower concentrations. The spontaneous production of vesicles and micelles can be induced by modifying the copolymer concentration in the emulsion. Our discoveries have a significant impact relative to the development of copolymer membranes and contribute to an enhanced comprehension of the mass manufacturing of polymer vesicles from single emulsions.
研究领域:
生物工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of the Australian Ceramic Society
·
2019
·Vol. 56
·期 2
·745-749
·
IF 0.692
Zhang Daixiong,Xiang Qing,Wang Xia,Guo Xiaogang,Li Xueming
Co 3 O 4 coating is one of most studied transition metal oxide due to its wide application in many fields such as gas sensors, electrochromic thin films, supercapacitors, and solar selective absorber. Aqueous electrophoretic deposition (EPD), which is considered as a cost-effective and environment-friendly coating technology, was successfully employed in preparing nano-Co 3 O 4 coating in this study. For the EPD process with the solid loading of 1 g L −1 , 2.0 mM nitric acid was employed as suitable additive and 5 V was employed as deposition voltage. The prepared nano-Co 3 O 4 coating exhibited good film characteristics, which was proved by scanning electron microscopy (SEM) technology. The result suggests that a rapid preparation of nano-Co 3 O 4 coating in aqueous dispersion system can be easily accomplished. Moreover, the optimum concentrations of the added nitric acid would increase with the solid loading of Co 3 O 4 nanoparticle, but the growth rate of the former was obviously lower than that of the latter.
研究领域:
材料科学
·
纳米技术
·
环境工程
·
表面工程
·
能源材料
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Shihan Zhang,Juping You,Han Chen,Jiexu Ye,Zhuowei Cheng,Jianmeng Chen
Microbial fuel cells (MFCs) are regarded as promising alternatives to anaerobic benzene, toluene, ethylbenzene, and xylene (BTEX) mineralization due to the enhancement of microbial degradation rate caused by bioanodes. In this research, a dual-chambered MFC was employed to evaluate the removal efficiency and power generation of single TE( o -X) or of dual or ternary TE( o -X) mixtures. Individually, TE( o -X) was readily biodegradable with a removal efficiency of 94.8%, 86.3%, and 71.6%, respectively, but the presence of toluene and o -xylene exhibited an adverse influence on the degradation of other mixed components. The o -xylene has the greatest inhibitory effect on microbial activity, as evidenced by laser scanning confocal microscope images. Microbial community analysis revealed that exoelectrogens prevailed in the absence of the o -xylene. Shifting the feeding gas from toluene to another individual gas or mixture caused the quantities of the exoelectrogens to gradually decrease. Moreover, the o -xylene degrader of Alicycliphilus sp. were prevailed from ~17.7% to ~60.3% in presence of the o -xylene. In addition, the observation of the nanowire/pili using scanning electron microscope images and cyclic voltammetry analysis revealed that the electrons produced were transferred to the anode directly.
研究领域:
环境科学
·
微生物学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Jiali Tan,Ying Huang,Baoyan Chi,Zhenfeng Xiong,Kemei Zhou,Xiaoqing Ruan,Rong Zha,Guoqian Zhang,Jun Zhang
Chemical conditioning for sludge dewatering is effective and widely used in wastewater treatment plants. However, the cellular and molecular level mechanism of deep sludge dewatering by chemical conditioning is unclear. Herein, two typical bacteria, Pseudomonas laurentiana 1–1 and Exiguobacterium acetylicum 3–1, derived from the waste-activated sludge, were used to investigate the hydrophobicity of the bacterial surface and alterations in the membrane properties and morphological structure of bacterial cells under ferric chloride (FeCl 3 ) conditioning. The results showed that 0.5 mM/g dry bacteria (DB) of FeCl 3 degraded proteins and polysaccharides in Pseudomonas laurentiana 1–1 and Exiguobacterium acetylicum 3–1 extracellular polymeric substances (EPS) and released water from the EPS. FeCl 3 conditioning at this concentration increased the hydrophobicity of Gram-negative Pseudomonas laurentiana 1–1 by 1.9 times, and Gram-positive Exiguobacterium acetylicum 3–1 increased by 18.7 times. The Gram-positive Exiguobacterium acetylicum 3–1 showed greater sensitivity to FeCl 3 due to its ability to degrade peptidoglycan in the bacterial cell wall, peptidoglycan is much higher in Gram-positive bacteria than in Gram-negative bacteria. Gram-positive bacteria were abundant in sludge bacteria. The peptidoglycan in Gram-positive bacteria cell wall was degraded after treatment with the appropriate dosages of FeCl 3 , which significantly increased the hydrophobicity of the Gram-positive bacteria, thereby effectively improving sludge dewatering. Besides, the cell membrane permeability of two typical bacteria was greatly increased by 0.5 mM/g DB of FeCl 3 , and the intracellular gel structure was degraded, releasing the intracellular water. This study provides theoretical guidance at the cellular-molecular level for the mechanism exploration of chemically conditioned sludge deep dewatering.
研究领域:
环境工程
·
微生物学
✓ 已验证
DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2019
·Vol. 34
·期 2
·e5349
·
IF 3.259
Xiao Ma,Chongying Xu,Zhibiao Mao,Peiyu Ji,Chenggang Jin,Dongsheng Xu,Yuqiang Ding
A series of chemical vapor deposition (CVD) precursors have been synthesized by a single-step reaction of 1,1,3,3-tetramethylguanidine and a variety of silicon chlorides. The structures of the 1,1,3,3-tetramethylguanidinate-based compounds were verified by 1 H NMR, 13 C NMR, XPS, EI-MS, and elemental analysis. The thermal stability, transport behavior, and vapor pressures of these compounds were evaluated by simultaneous thermal analyses (STA). These compounds are highly stable and those in liquid form are very volatile. Silicon carbonitride (SiCN) thin films were prepared by using bis (tetramethylguanidine)-dimethyl-silane as the precursor in helicon wave plasma chemical vapor deposition (HWP-CVD). The properties of the films were investigated by SEM, AFM, and XPS. The results showed that the films have good uniformities, low friction coefficient, and high hardness, enabling the films for fabrication of semiconductor devices.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Changwei Li,Zhefeng Gu,Songming Zhu,Dezhao Liu
This study evaluated the contribution of biotic and abiotic routes to the 17 β -estradiol (E2) removal in moving bed biofilm reactors (MBBRs), and uncovered the interrelation between the E2 removal routes and biofilm characteristics, which was not researched in previous literature. Three MBBRs with different C/N ratios (0 for C/N 0 ; 2 for C/N 2 ; and 5 for C/N 5 ) were operated in continuous mode. A 65-day degradation demonstrated that the MBBRs had high potential to remove E2 regardless of the C/N (E2 removal greater than 99% for all MBBRs; P > 0.05). Further batch tests showed that the E2 removal mainly resulted from heterotrophic activities for all MBBRs, accounting for approximately 85% for all MBBRs (P > 0.05), followed by nitrification (10–11%) and adsorption (4–5%). Importantly, lower adhesive force likely led to higher E2 adsorption onto biofilms. Besides, enhanced ammonia oxidizing rate (AOR) was consistent with the high contribution of nitrification to the E2 attenuation. Importantly, heterotrophic activity was positively correlated with its contribution to E2 removal (r = 0.99, P < 0.05). To sum, the results obtained in this study helped to understand the E2 removal routes in nitrifying biofilm systems.
研究领域:
环境科学
·
微生物学
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2023
·Vol. 34
·期 45
·455701
·
IF 3.5
Shuang Wang,Li Yang,Xiaoting Ren,Wenchao Tong,Wei Li,Haojie Li,Junda Huo
Copper azide (CA) has gradually become the chosen priming agent for microexplosive devices as a lead-free green priming agent. However, charge loading is challenging due to its high electrostatic sensitivity, severely limiting its practical application. In this study, copper hydroxide particles were evenly coated on the surface of carbon fiber using electrospinning and quick hot-pressing, and CA-based composites with uniform load were created using the in situ azide technique while keeping good film characteristics. The produced CA-HP film has an electroostatic sensitivity of 3.8 mJ, which is much higher than the raw material of 0.05 mJ. The flame sensitivity has also been increased from 45 to 51 cm, and the use safety has been considerably enhanced. Furthermore, hot-pressed CA-HP films can improve the film's qualities, such as easy cutting and processing into the required shape, compatibility with MEMS processes, and the ability to successfully detonate secondary explosives with only 1 mg. This novel coupling technology expands the possibilities for developing high-safety primers for micro-initiator.
研究领域:
材料科学
·
爆炸物工程
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2013
·Vol. 130
·期 4
·2660-2670
·
IF 1.395
Long Zhang,Yangping Wen,Yuanyuan Yao,Xuemin Duan,Jingkun Xu,Xiaoqiang Wang
Poly(2-chloromethyl-2,3-dihydrothieno[3,4- b ][1,4]dioxine), a chloromethyl functionalized poly(3,4-ethylenedioxythiophene) derivative (PEDOT-MeCl), was synthesized electrochemically via the potentiostatic polymerization of its monomer in dichloromethane solution containing suitable tetrabutylammonium tetrafluoroborate, then it was used for the characterization of film properties and the fabrication of electrochemical sensor. The properties of the resulting PEDOT-MeCl film were characterized by different methods such as cyclic voltammetry, electrochemical impedance spectroscopy, Fourier transform infrared and ultraviolet–visible techniques, scanning electron microscope, and thermogravimetric analysis. The PEDOT-MeCl film displayed a good reversible redox activity, remarkable capacitance properties, good thermal stability, rough, and porous structure, especially fluorescent spectra indicated that PEDOT-MeCl was a blue-emitter with maximum emission centered at 396 and 398 nm. Finally, the PEDOT-MeCl film was employed for the fabrication of the sensing electrode, and dopamine was chosen as a model analyte for the application of the electrochemical sensor. Results indicated that the PEDOT-MeCl film as sensing interface was feasible, and studies of these film properties were very beneficial for studying properties and applications of other poly(3,4-ethylenedioxythiophene) derivative films. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 2660–2670, 2013
研究领域:
材料科学
·
电化学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Microbiology
·
2022
·
IF 6.064
Wang Meng,Deng Zifeng,Li Yanmei,Xu Keyong,Ma Yi,Yang Shang-Tian,Wang Jufang
Pseudomonas aeruginosa (P. aeruginosa), an opportunistic pathogen, is often associated with difficulties in treating hospital-acquired infections. Biofilms formed by P. aeruginosa significantly improve its resistance to antimicrobial agents, thereby, posing a great challenge to the combat of P. aeruginosa infection. Antimicrobial peptides (AMPs) have recently emerged as promising antibiofilm agents and increasingly attracting the attention of scientists worldwide. However, current knowledge of their antibiofilm behavior is limited and their underlying mechanism remains unclear. In this study, a novel AMP, named PEW300, with three-point mutations (E9H, D17K, and T33A) from Cecropin A was used to investigate its antibiofilm property and antibiofilm pathway against P. aeruginosa. PEW300 displayed strong antibacterial and antibiofilm activity against P. aeruginosa with no significant hemolysis or cytotoxicity to mouse erythrocyte and human embryonic kidney 293 cells. Besides, the antibiofilm pathway results showed that PEW300 preferentially dispersed the mature biofilm, leading to the biofilm-encapsulated bacteria exposure and death. Meanwhile, we also found that the extracellular DNA was a critical target of PEW300 against the mature biofilm of P. aeruginosa. In addition, multiple actions of PEW300 including destroying the cell membrane integrity, inducing high levels of intracellular reactive oxygen species, and interacting with genomic DNA were adopted to exert its antibacterial activity. Moreover, PEW300 could dramatically reduce the virulence of P. aeruginosa. Taken together, PEW300 might be served as a promising antibiofilm candidate to combat P. aeruginosa biofilms.
研究领域:
微生物学
·
分子生物学
·
传染病学
·
药学
✓ 已验证
DOI
PubMed
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2022
·
IF 6.056
Fanfan Song,Jingnan Chen,Aoze Zheng,Shaojun Tian
The differences in sterol chemical structures influenced the membrane characteristics of liposomes, especially the physicochemical changes during storage. Therefore, the effects of sterols (cholesterol, β-sitosterol, and stigmasterol) on membrane characteristics were investigated and compared with liposomes without sterols. The incorporation of sterols increased the particle size of liposomes. Transmission electron microscopy images showed that sterols improved the rigidity and decreased the deformability of membranes. Cholesterol produced a more condensing effect on membranes, whereas stigmasterol reduced the effectiveness of lipid packing as shown by Raman spectroscopy. The addition of sterols provided good vesicle size stability during storage. Fluorescence probe analysis demonstrated decreased membrane hydrophobicity and micropolarity with prolonged storage. Phospholipid hydrolysis and oxidation played a major role in regulating membrane characteristics. Among the three sterols, β-sitosterol was the most effective for the inhibition of hydrolysis and oxidation.
研究领域:
药剂学
·
生物物理学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）