SOLID STATE SCIENCES
·
2019
·
IF 2.155
Wei Li,Pengcheng Liu,Ruyue Niu,Jinping Li,Shuang Wang
Three CeO 2 supports with different concentration of surface oxygen vacancies were prepared by using C 12 H 29 NO (TPAOH), C 2 H 8 N 2 (EDA) and NaOH as precipitant under hydrothermal conditions, respectively. Catalytic experiments showed that the Ru/CeO 2 -TPAOH catalyst has superior catalytic activity (22000 μmol g −1 h −1 ) than Ru/CeO 2 -EDA (19000 μmol g −1 h −1 ) and Ru/CeO 2 –NaOH (16500 μmol g −1 h −1 ) at 450 °C, 3 MPa. In addition, the introduction of Cs and Ba promoters improve the catalytic activity of the Ru/CeO 2 -TPAOH. However, the introduction of K promoter inhibits the catalytic activity of the Ru/CeO 2 -TPAOH. The 4% Cs promoter can effectively increase the catalytic activity of the Ru/CeO 2 -TPAOH (32000 μmol g −1 h −1 ). BET and TEM indicated that 5.5 nm average pore size of CeO 2 -TPAOH support contributes to the dispersion of active metal Ru. XPS and CO 2 -TPD proved that the Ru/CeO 2 -TPAOH catalyst has higher Ce 3+ concentration, more oxygen vacancies, and higher basic site density, which are important factors for improving ammonia synthesis activity.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2024
·
IF 6
Huimin Shao,Xiaoyun Su,Yaru Wang,Jie Zhang,Tao Tu,Xiaolu Wang,Huoqing Huang,Bin Yao,Huiying Luo,Xing Qin
Mycotoxins are widely present from cereal crops to food products, posing a significant risk to food safety and causing serious health and economic losses. Therefore, it is imperative to develop a sustainable and efficient detoxification strategy to address mycotoxin contamination. Herein, a dye-decolorizing peroxidase, Ba DyP, from the white-rot fungus Bjerkandera adusta was successfully expressed as a soluble form in Escherichia coli with the help of molecular chaperones. Purified recombinant Ba DyP could efficiently degrade multiple mycotoxins including aflatoxin B 1 , zearalenone, and deoxynivalenol in the presence of mediators such as Mn 2+ or 1-HBT. Meanwhile, their degradation products were identified using UPLC-MS/MS, including AFB 1 -diol, AFQ 1 , 15-OH-ZEN, HZEN, and C 15 H 18 O 8 . Furthermore, cell survival tests exhibited a significant reduction in the biological toxicity of these degradation products. These findings indicate that the use of dye-decolorizing peroxidase could be a promising approach for the effective removal of multiple mycotoxins in cereal crops and food products.
研究领域:
食品安全
·
微生物学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 45
·25313-25318
·
IF 2.936
Lei Peng,Manjun Zhang,Musong Lin,Qiang Fu
The insulating materials used in power cables are susceptible to damage and cracks during installation and operation. To solve this problem, we have prepared a self-healing material PVP/p(HEMA-co-BA), which is synthesized by radical polymerization using HEMA, BA, PVP and a host–guest assembly. The host–guest assembly is constructed through interactions between host and guest molecules (CD–Al2O3 NPs act as the host, and HEMA–Ad acts as the guest). The characterization results of the materials show that there are two kinds of supramolecular interactions, namely, the host–guest interaction and the hydrogen bonding. The material possesses good thermal stability (heat-resisting temperature can reach 200 °C) and good electrical performance. The storage modulus of the material can be increased up to 432 MPa using a cross-linking agent at 20 °C. Furthermore, the material exhibits self-healing property, and it can self-heal several times; its self-healing efficiency is relative to the dosage of the cross-linking agent.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 24
·1-12
·
IF 2.8
Qu Jing-Jing,Liu Fei,Yuan Chang-Lai,Liu Xiao,Meng Liu-Fang,Shen Nai-Rui,Ning Hui-Wang,Jiang Wei
The Mn 3+ -ions doped Ba(Mn x Bi 1− x )O 3 ( x = 0.0, 0.02, 0.04, 0.06, 0.08 and 0.1) ceramic block samples are prepared by traditional solid-state method. The phase structures of these ceramic systems are analyzed, in which the XRD analysis results show the ceramic systems can be formed the solid solutions as the relatively lower Mn-adding content of x ≤ 0.4, and the ceramic blocks appear the additional diffraction peak belonging to the MnO 2 second phase with the increase of x value (≥ 0.6). Combined with the acceptor atom-doping conduction model theory and XPS analysis results, the main conductive forms of these Ba(Mn x Bi 1− x )O 3 thermistors include in the following three kinds: the movable holes formed by the acceptor Mn-doping, the 2Bi 4+ → Bi 3+ + Bi 5+ disproportionation reaction, and the [Mn 3+ /Mn 4+ ] small polaron jump. For the electrical properties test results, the NTC thermal properties for the x = 0.02 and x = 0.06 samples are relatively superior: ρ 25 − 690 Ω cm, B 25/85 − 3150 K and ρ 25 ~ 940 Ω cm, B 25/85 − 3080 K, respectively.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Tongzhen Fan,Lichun Cheng,Changsheng Huang,Qingrong Yao,Wei Yuan,Zhao Lu,Qianxin Long,Huaiyin Zhou
LaNiO 3 is considered electromagnetic wave-absorbing material owing to its unique crystal structure and controllable dielectric constant. However, the effect of ion doping modification on microwave absorption performance remains to be thoroughly investigated. In this study, LaNi 1− x Ba x O 3 ( x = 0, 0.02, 0.04, 0.06) was prepared through sol-gel methods. The reflection loss (RL) of the sample in the 2−18 GHz band was calculated using transmission line theory . Specifically, LaNi 0.96 Ba 0.04 O 3 exhibited superior results, with an RL value of −34.54 dB at d = 3 mm and f = 6.80 GHz, indicating effective absorption within the C-band. These results suggest that adding an appropriate amount of Ba ions to the material can effectively regulate the electromagnetic parameters and optimize impedance matching . Introducing Ba ions into the crystal interior produces abundant defects, which provide active sites for multipolarization and ultimately improve the wave-absorbing properties of the material. In addition, radar cross section(RCS) simulations simulation after coating the samples on original ideal conductor (PEC) substrates provide support for potential practical applications of the material.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2024
·
IF 15.7
Tianhua Zhang,Haihui Hu,Jiaxin Li,Yinglong Gao,Lingling Li,Mingyuan Zhang,Xuanbei Peng,Yanliang Zhou,Jun Ni,Bingyu Lin,Jianxin Lin,Bing Zhu,Dongshuang Wu,Linjie Zhang,Lili Han,Lirong Zheng,Xiuyun Wang,Lilong Jiang
Ammonia (NH 3 ) is an excellent candidate for hydrogen storage and transport. However, producing NH 3 under mild conditions is a long-term, arduous task. Atomic cluster catalysts (ACCs) have been shown to be effective for catalytic N 2 -to-NH 3 conversion, opening the door to the development of efficient catalysts under mild conditions. Still, ACC formation with thermally stable catalytic sites remains a challenge because of their high surface free energy . Herein, we report anchoring Ba and/or Ce onto Ru ACCs (2 wt% Ru atomic clusters supported on N-doped carbon) to form so-called clusters–metal oxide promoters electronic interaction (CMEI) to stabilize the Ru atomic clusters. The resulting Ba/Ce/Ru ACCs significantly boost the NH 3 synthesis rate to 56.2 mmol NH3 g cat −1 h −1 at 400 °C and 1 MPa, which is 7.5-fold higher than that of Ru ACC. The strengthened CMEI between the Ba/Ce and Ru atomic clusters across the Ba/Ce/Ru ACC enables electron transfer from Ba and/or Ce to Ru atomic clusters. As such, the electron-enriched Ru atom could facilitate electron transfer to N≡N bond π* orbitals, which would weaken the N≡N bond and drive the eventual conversion of N 2 to NH 3 . This study offers insight into the role of CMEI in Ru ACCs and provides an effective approach for designing stable atomic cluster catalysts for NH 3 synthesis.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Acta Biomaterialia
·
2025
·
IF 9.6
Rong Zhang,Yongchang Tian,Jiaming Cui,Ian W Hamley,Chunsheng Xiao,Li Chen
The management of bacterial wounds presents a significant challenge in the field of medicine and poses a grave threat to public health. Traditional gauze materials exhibit limited efficacy in treating bacterial infection wounds, while antibiotics demonstrate cytotoxicity and resistance. Therefore, in this study, the peptide biomimetic polymer (PAL-BA) was designed and served as the antibacterial framework for constructing an antibiotic drug-free antibacterial hydrogel dressing through a Schiff base reaction with oxidized hyaluronic acid (OHA). The design of PAL-BA aims to emulate the antimicrobial properties of host defense peptides, serving as a viable alternative to antibiotics drugs. It exhibits comparable antimicrobial activity to polylysine while maintaining biosafety. In vitro experiments demonstrated that PAL-BA exhibited exceptional antibacterial activity against both Staphylococcus aureus and Escherichia coli , while the PAL-BA based antibacterial hydrogel (PBP gel) effectively eliminated 100% of pathogenic bacteria within a duration of 140 min. In vivo studies further demonstrated that PBP hydrogels effectively accelerate the healing of bacterial infected wounds by blocking the infection process. Therefore, the antimicrobial peptide biomimetic polymer hydrogel exhibits significant promise for the management of bacterial wound infections. Statement of significance The management of bacterial infection wounds remains a challenging issue in clinical practice. In this study, we propose the utilization of a peptide biomimetic polymer (PAL-BA) as an antibacterial framework and its combination with oxidized hyaluronic acid (OHA) through Schiff base reactions to develop an antibiotic drug-free antibacterial hydrogel dressing for the treatment of bacterial infections wounds. The design of PAL-BA aims to mimic the antimicrobial properties of host defense peptides, providing a promising alternative to antibiotic drugs. It demonstrates comparable antimicrobial activity to poly-lysine while maintaining biosafety. Importantly, this antimicrobial peptide biomimetic polymer hydrogel effectively inhibits the infection process in mouse wounds and accelerates the healing of bacterially infected wounds, offering a therapeutic approach for treating infected wounds.
研究领域:
生物材料学
·
医学
·
药理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2015
·
IF 3.163
Meng Zhang,Zhenyang Luo,Jinwen Zhang,Shuigen Chen,Yonghong Zhou
A novel phosphorus-nitrogen flame retardant (DOPO-BA) was synthesized from the condensation reaction of benzaldehyde , aniline and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO). The structure of DOPO-BA was characterized by Fourier transform infrared spectrometry (FTIR), 1 H NMR, 31 P NMR, elemental analysis and thermogravimetric analysis (TGA). DOPO-BA was used as a flame retardant in the preparation of rosin-based rigid polyurethane foams (RPUFs). The effects of DOPO-BA addition on the mechanical, thermal, and flame-retardant properties of RPUF were investigated. The morphology of DOPO-BA filled RPUFs was characterized by scanning electron microscope (SEM). The results show that DOPO-BA rendered RPUF good physical, thermal stability and flame-retardant properties. Limiting oxygen index (LOI) value of RPUF containing 20 wt% DOPO-BA increased to 28.1% from 20.1% of the RPUF without DOPO-BA.
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
MATERIALS SCIENCE FORUM
·
2015
·
IF 0
Gang Chen,Chun Wei Gong,Chun Lin Fu,Xiao Dong Peng,Wei Cai,Rong Li Gao,Xiao Ling Deng
(Sr1-xBax) 2(Nb0.9Ta0.1) 2O7 (SBNT) ceramics were prepared by solid state reaction. The crystal structure of SBNT ceramics, surface morphology and dielectric properties were studied using XRD, SEM and LCR instrument analyzer, respectively. The results show that the grain size decreases with increasing Ba concentration, and all samples show single phase, no second phase can been observed. Addition of Ba ion can improve the dielectric properties of SBN ceramics. The dielectric constant increases first, then decreases; the maximum value (εr=97) can be obtained at x=0.1, the dielectric constant changes slightly with increasing wide frequency.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
JOURNAL OF NON-CRYSTALLINE SOLIDS
·
2019
·
IF 2.6
Wei Zhao,Kunfeng Li,Peng Lin,Kai Xu,Shengheng Tan
Some particular hazardous and nuclear wastes containing a large amount of chlorine would cause the problematic processing during the waste vitrification, because of the low solubility of Cl in silicate glasses . Although a few works reported the chlorine behavior in aluminosilicate glasses, the results do not always show the consistency and a small variation of glass compositions may cause the significant changes. The present work studied the dissolution of Cl in the range of alkaline earth aluminosilicate glasses with the nominal mole composition of 50SiO 2 -10Al 2 O 3 -40AeO (Ae = Ca, Sr or Ba). The solubility of Cl in the glasses with different alkaline earth species followed the order of Ca (~8.1 wt%) > Sr (~6.0 wt%) > Ba (~3.5 wt%). The glass density and glass transition temperature decreased with the addition of Cl in three types of glasses, and AeCl 2 salts, identified with X-ray diffraction, segregated from the glasses, when Cl addition exceeds its solubility. Raman spectra indicate the dissolution of Cl leads to the increase of bridged oxygen bonds in glasses, supposing that Ca 2+ ions are attracted by Cl − ions, leaving the non-bridging oxygens that initially associated with Ca 2+ ions are bonded to Si 4+ (Al 3+ ) to become bridging oxygens.
研究领域:
材料科学
·
核废料处理
✓ 已验证
产品关联
DOI
高影响因子
Journal of Superconductivity and Novel Magnetism
·
2022
·Vol. 35
·期 9
·2473-2484
·
IF 1.675
Li Pengwei,Li Jie,Zhang Wenhao,Wang Yonglun,Yao Kai
Pr-doped M-type barium ferrite with a composition of Ba 1− x Pr x Fe 12 O 19 (0.00 < x < 0.25) was prepared via solid-state sintering combined with high-energy ball milling. The structures, spectra, morphologies, and magnetic properties of Pr 3+ -substituted Ba hexaferrites were analyzed herein. Under high-energy ball milling, the material produces crystal vacancy defects for elemental doping. The X-ray diffraction results showed that the hexagonal crystal structure was affected when the Pr content ( x ) was > 0.20. The GSAS refinement results show that the synthesized samples were good. The scanning electron microscopy results and Fourier transform infrared (FT-IR) spectra of the tetrahedral and octahedral sites (FT-IR result of the Fe–O bond = 601 and 448 cm −1 peaks, respectively) of the prepared material proved the formation of a hexagonal crystal structure. The magnetic properties of the samples were measured using a vibrating sample magnetometer at room temperature, and the obtained results demonstrated that the coercivity increased with an increase in the doping amount (from 3815.03 at x = 0 to 4600.56 kOe at x = 0.25). At the same time, the saturation magnetization maintained its high value (> 72.568 emu/g), which is beneficial for preparing permanent magnets.
研究领域:
材料科学
·
磁学
✓ 已验证
产品关联
DOI
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2016
·
IF 3.42
Danfeng Cao,Yingchao Zhang,Zhanchen Cui,Yuanyuan Du,Zuosen Shi
In order to obtain an ideal material using for artificial corneal skirt, a porous polymer hydrogel containing 2-hydroxyethyl methacrylate (HEMA), trimethylolpropane triacrylate (TMPTA) and butyl acrylate was prepared through one-step radical polymerization method and the usage of CaCO 3 whisker as porogen. The physical-chemical properties of the fabricated polymer hydrogel can be adjusted by CaCO 3 whisker content, such as pore size, porosity, water content of materials and surface topography. Then a series of cell biology experiments of human corneal fibroblasts (HCFs) were carried out to evaluate its properties as an artificial corneal skirt, such as the adhesion of cells on the materials with different pore size and porosity, the apoptosis on materials with different characteristics, the distribution of the cells on the material surface. The results revealed that high porosity not only could improve water content of hydrogel, but also strengthen the adhesion of HCFs on hydrogel. In addition, high porosity hydrogel with the whisker shape of pores showed much elongate spindle-like morphology than those low porosity hydrogels. MTT assay certified that the resulted polymer hydrogel material possessed excellent biocompatibility and was suitable for HCFs growing, making it promising for being developed as artificial corneal skirt.
研究领域:
材料科学
·
组织工程
·
眼科
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）