JOURNAL OF THERMAL SPRAY TECHNOLOGY
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2021
·Vol. 30
·期 4
·873-885
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IF 2.757
Ye Fuxing,Yang Wenqi,Yan Shuai,Yu Jianxing
CMAS corrosion is one of the significant failure mechanisms for thermal barrier coatings (TBCs). In this work, the corrosion behaviors and wettability of CMAS on M-YTaO 4 at 1350 °C are studied to evaluate the M-YTaO4 ceramics’ potential to replace YSZ. The results show that the contact angles of CMAS on M-YTaO 4 with different time (1 min, 0.5 h, 4 h, 10 h and 24 h) are around 14.3° (14.4°14.4°, 14.4°, 14.3° and 14.2°, respectively), and larger than that on YSZ (8.0°, 1 min), which means the wettability of CMAS on M-YTaO 4 is worse than that on YSZ and which is benefit to improve its corrosion resistance. The thickness of reaction layer is increasing with elapsed time, but the increasing rate is decreased, and the maximum reaction thickness is 31.42 μm at 24 h. There are four main phases after reaction, which are M-YTaO 4 , M’-YTaO 4 , Ca 2 Ta 2 O 7 and Y 2 Si 2 O 7 . For the effects of lattice distortion and thermodynamics reason, M’-YTaO 4 can retain steadily at room temperature. Besides, the chemical reaction process between CMAS and yttrium tantalite is also be discussed.
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Huiqin Wang,Jingru Guan,Jinze Li,Xin Li,Changchang Ma,Pengwei Huo,Yongsheng Yan
In this work, the ordered mesoporous CeO 2 (m-CeO 2 ) was successfully fabricated via the nanocasting pathway, through using SBA-15 as a hard template. Besides, g-C 3 N 4 /Ag/m-CeO 2 composite was successfully constructed by calcination method. Meanwhile, the obtained samples were investigated by series of test techniques. The XRD, SEM and TEM results show that the m-CeO 2 and Ag/m-CeO 2 with the ordered mesoporous trait. Besides, the EPR, Raman and XPS results suggest that the oxygen vacancies (O v ) and Ce 3+ and Ce 4+ are in g-C 3 N 4 /Ag/m-CeO 2 . In addition, the ordered mesostructure is favorable for the CO 2 molecular movement and adsorption/desorption reaction. The g-C 3 N 4 nanosheets, a promising material possessing suitable conductor band, large specific area, non-toxicity, and outstanding chemical stability, is a candidate semiconductor for CO 2 conversion. The introduction of g-C 3 N 4 nanosheets to Ag/m-CeO 2 overcomes the photocorrosion of Ag nanoparticles and Ag facilitate the transfer of photogenerated electrons. The photocatalytic activity results show that when the loading of Ag is 7 wt%, the g-C 3 N 4 /7Ag/m-CeO 2 composite exhibits the superiority activity for CO 2 photoconversion to CO (13.94 μmol/g) and CH 4 (7.39 μmol/g) under UV-irradiation in 10 h.
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DALTON TRANSACTIONS
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2016
·Vol. 45
·期 16
·7124-7130
·
IF 4.177
Li-Jun Zhang,Yan-Yan Li,Peng-Fei Liu,Ling Chen
New borophosphates Li3Cs2M2B3P6O24 (M = Pb, Sr) have been synthesized by high-temperature solid-state reactions. The single-crystal X-ray diffraction data reveal their non-centrosymmetric cubic space group P213 and lattice parameters of a = 12.7246(3) Å and 12.687(2) Å and V = 2060.31(8) Å3 and 2042.3(4) Å3 for Li3Cs2Pb2B3P6O24 and Li3Cs2Sr2B3P6O24, respectively. They are three-dimensional (3D) [BP2O8]3−∞ anionic frameworks formed by a new double six-membered ring building unit consisting of BO4 and PO4 units joined alternately. Interestingly, such a double six-membered ring is regarded as the structural variation of the 12-membered ring in the known KSrBP2O8, fusing at the BO4 tetrahedron induced by the coexistence of the Li+ and Cs+ cations with their large size difference. The title compounds show weak SHG intensity and exhibit photoluminescence emissions at 410 nm for Li3Cs2Pb2B3P6O24 and 440 nm for Li3Cs2Sr2B3P6O24.
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PubMed
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JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
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2015
·
IF 3.615
Yansheng Liu,Bo Qiao,Xinlin Li,Xuanduong Le,Wei Zhang,Jiantai Ma
Palladium metal nanoparticles have been applied to hydrodechlorination of chlorophenols in contaminated water using H 2 as a clean and sustainable reductant. However, there are two major challenges to widespread technology adoption which are the activity loss caused by nanoparticle aggregation and the difficulty of nanoparticle recovery. In this study, a synthesis of a core-shell structured catalyst with encapsulated Pd nanoparticles has been given and whose catalytic activity has been tested in hydrodechlorination of chlorophenols under 1 atm H 2 at room temperature. The catalyst material consists of a nonporous silica core decorated with Pd nanoparticles that are further encapsulated within an ordered mesoporous silica shell. Well-defined mesopores (2.4 nm) provide a physical barrier to prevent Pd nanoparticle (∼10 nm) movement, aggregation and detachment from the support into water. Compared with some supported Pd catalysts such as Pd/AC and Pd/Al 2 O 3, SiO 2 /Pd@m-SiO 2 exhibits higher catalytic performance. After 5 times of recycling, catalytic activity of SiO 2 /Pd@m-SiO 2 reduces slightly and this result confirms the good recyclability of SiO 2 /Pd@m-SiO 2 . The function of the mesoporous shell, preventing aggregation of active nanoparticles, suggests a promising general strategy of using metal nanoparticle catalysts for water purification and related aqueous-phase applications.
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POLYMER DEGRADATION AND STABILITY
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2024
·
IF 6.3
Tinghao Wu,Yingqi Gu,Dong Zhao,Guodong Jiang,Tingwei Wang,Yucai Shen
Paper-based materials have become increasingly prevalent in the packaging and daily life. However, paper is flammable and hydrophilic, hindering its widespread application. Here, a novel reactive flame retardant of m-xylylenediamine phytate ammonium (MPAP) was prepared. Cellulose paper with superior flame-retardant and hydrophobic properties was successfully prepared by surface spraying technology and impregnation process, through the reaction of flame retardant and poly(methylhydrosiloxane) (PMHS) with cellulose fibers. The water contact angle (WCA) of the modified paper was 122.6°, while the limit oxygen index (LOI) value reached 41 %, which had significant self-extinguishing performance. The total heat release rate of the modified paper was reduced from 12.8 kJ/g to 0.6 kJ/g. The modified paper also exhibited excellent performance for oil/water separation. Furthermore, this effective and simple strategy can also be applied to other cellulose-contained substrates for the application in construction, textiles, furniture and other fields.
研究领域:
材料科学
·
化学工程
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Journal of Environmental Chemical Engineering
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2024
·
IF 7.4
Yanjie Niu,Hongguan Wang,Sixi Guo,Jie Xu,Yingkun Zhu,Fanhui Guo,Yixin Zhang,Jianjun Wu
Coal gasification fine slag is typical coal-based solid waste, and the crux to its resource utilization is the co-utilization of carbon and ash. A novel iron-doped mineral and carbon composite electrocatalyst (Fe-FSAPH) was synthesized by depolymerizing and reconstituting the ash phase for the collaborative electrocatalytic degradation of m -cresol wastewater. Exogenous iron participated in and promoted mineral reconstitution, increasing Si(-O)1/Si(-O)3 ratio (0.37→1.18) and promoting the formation of active Si-OH groups. The iron-doped minerals dispersedly developed with a sheet-like on carbon matrix, which improved intimate physical proximity and synergistic behavior of carbon/minerals. The obtained Fe-FSAPH, with a specific surface area of 246.52 m 2 /g, has a large diffusion rate constant K D2 (2.98 mg·min −0.5 /g) in the rate-limiting step of m -cresol adsorption. Its electrochemical performances exhibit excellent, including cyclic voltammetry charge of 8.52 mC/cm 3 , charge-transfer resistance of 0.59 Ω, and Tafel slope of 159 mV/dec. The m -cresol with a concentration of 194.67 mg/L could be electrooxidized within 18 min due to the abundance of •OH and O 2 •- in the Fe-FSAPH system, which accelerated the radical attack reaction. Moreover, Si-OH groups catalyzed conversion of •OH to O 2 •- by generating oxygen vacancies and undergoing dehydroxylation, shortening the rapid reaction time of m -cresol removal to 14 min. The introduction of iron enhanced the synergy of carbon and minerals, with •OH generated via the Fenton-like reaction, offering a convenient environment for mineral catalysis. Hence, the study provided new ideas for the comprehensive utilization of carbon and ash and treatment of waste by waste.
研究领域:
环境科学
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材料科学
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2024
·
IF 4.3
Xiaotong Wang,Qingling Zhao,Qinghong Song,He Bu,Jie Gao,Lanlan Li,Xiaofei Yu,Xiaojing Yang,Zunming Lu,Xinghua Zhang
Carbon dots (CDs) possess the merits such as energy efficiency, green sustainability and environmental friendliness, comparing with top-down synthesis methods at higher pressure or temperature condition. Here, a variety of emission states CDs were prepared by using the method of room temperature chemistry by selecting green raw materials such as glucose, p-phthalaldehyde and m-diethylaminophenol. The luminescence mechanism was studied in detail. The luminescent center of blue emitting carbon dots (B-CDs) and green emitting carbon dots (G-CDs) is C O bond, and the increased contents of C O bond lead to the creation of new energy levels between the energy gaps of HOMO and LUMO levels, which results in the red shift of luminescence wavelength. The emission state of red emitting carbon dots (R-CDs) is due to the formation of amino N. In addition, R-CDs have an exclusive respond to dopamine (DA) and are regarded as good fluorescent probes for detecting DA. Furthermore, the addition of ascorbic acid (AA) restores the luminescence of R-CDs quenched by DA. Therefore, R-CDs has great application potential as a selective fluorescent “turn on-off” probe.
研究领域:
化学
·
生物分析
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材料科学
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PubMed
高影响因子
BIOORGANIC CHEMISTRY
·
2025
·
IF 4.7
Hongyan Lin,Shuaijun Cui,Xinye Xu,Qingqing Chen,Jiazi Ge,Dongxuan Ai,Jie Zhu,Yuheng Tao,Liqun Wang,Lingyu Ruan,Wenhao Ge
18β-Glycyrrhetinic acid (18β-GA) is the main active component of licorice and one of the most promising lead compounds in traditional Chinese herbal medicine. Previous studies have shown that 18β-GA can act as a PPARγ agonist to exert antitumor activity. However, the number of reported 18β-GA derivatives as PPARγ agonists is limited and they have significant toxic side effects, which greatly restricts their application and development. To obtain highly effective and low-toxic PPARγ agonists, through structure-activity relationship (SAR) analysis, we constructed a molecular library of 18β-GA derivatives containing 13,440 compounds and screened out 14 novel 18β-GA ester derivatives. The selected compounds were evaluated for their antitumor activity in vitro. The results showed that most of the compounds exhibited strong anti-proliferative activity against five human cancer cell lines, especially the human colon cancer cell line HT-29, without significant toxicity to normal cell lines. Among them, C1 had the strongest anti-proliferative activity against HT-29, with an IC 50 value of 12.25 μM, which was 12 times higher than that of its parent nucleus 18β-GA. C1 can block the cell cycle of HT-29 cells in G2/M phase, significantly inhibit their migration and induce their apoptosis. Molecular docking and dynamics simulation results suggested that C1 could stably bind to the active pocket of PPARγ. Further PPARγ activity analysis and drug-likeness prediction results indicated that C1 could act as a PPARγ agonist to exert antitumor effects and had certain drug-likeness, which is worthy of further study.
研究领域:
药理学
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药物化学
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肿瘤学
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2013
·
IF 2.596
Xiaofen Xu,Yanggong Li,Yuanyuan Shen,Shengrong Guo
Norcantharidin-conjugated chitosan conjugates (NCTD-CSs) with different degrees of substitution ( DS , 60.2% and 97.9%) were synthesized and characterized by 1 H NMR, FT-IR, and XRD. In comparison with CS, the NCTD-CSs had lower crystallinity and better water solubility. Less than 6% NCTD was released from the NCTD-CSs through the hydrolysis of ester bonds in phosphate-buffered solution (PBS, pH 5.0 and 7.4) within 16 days, showing sustained drug release characteristic. The result of cytoxicity study showed that the NCTD-CSs were cytotoxic to MGC80-3 cells and their cytotoxicity was lower than that of NCTD. Fluorescence microscope and flow cytometry analysis demonstrated that the amount of the NCTD-CSs uptaken by MGC80-3 cells increased as incubation time. Confocal microscopy study showed that the NCTD-CSs were internalized into cells by endocytosis and mainly localized in lysosomes within 24 h. It was found that the NCTD-CSs arrested MGC80-3 cell cycle at G2/M phase and induced cell death via cell apoptosis similarly to NCTD. These results indicated that the NCTD-CSs might be an efficient NCTD delivery system for cancer therapy.
研究领域:
药学
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肿瘤学
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材料科学
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PubMed
高影响因子
Molecular Catalysis
·
2024
·
IF 3.9
Yanni Liu,Yajing Cai,Zhoujie Liang,Guojie Zhang,Jun Liu,Yunfei Zhang,Tianshan Li,Xiaodi Zhang,Ying Wang,Yuqiong Zhao
Dry reforming of methane (DRM) is a novel technology that enables the direct utilization of greenhouse gases (CH 4 and CO 2 ) for the production of value-added products. In the DRM reaction, the acid-base characteristics of the catalyst support play a pivotal role in determining the performance of the catalyst. In this study, a series of Co-based catalysts with different alkali earth metal-modified Al 2 O 3 composite supports, specifically m-Al 2 O 3 (m=Ca, Mg, and Ba), were prepared using the impregnation method. Various characterization techniques were employed to investigate the impact of alkaline site modulation on the support surface with respect to anti-sintering and anti-coking properties. The results demonstrate that the m-Al 2 O 3 composite support catalysts, prepared with Mg and Ca modulation, exhibit an abundance of basic sites and oxygen vacancies. This promotes the adsorption and activation of CO 2 , enhances the rate of carbon elimination, and effectively addresses carbon deposition and metal sintering issues. Notably, the CoLa/Mg-Al 2 O 3 catalyst shows the highest performance under reaction conditions of 750 °C, with CH 4 and CO 2 conversions reaching 92.3 % and 97.5 %, respectively. On the other hand, the CoLa/Ba-Al 2 O 3 catalysts display poor performance in dry reforming. Kinetic studies indicate that CoLa/Mg-Al 2 O 3 catalyst significantly reduce the apparent activation energy required for CH 4 and CO 2 cracking. Furthermore, it is demonstrated that the introduction of alkali earth metals can promote the dissociation of CH 4 and CO 2 .
研究领域:
催化化学
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材料科学
·
能源化学
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高影响因子
Inorganic Chemistry Frontiers
·
2024
·
IF 6.1
Xiaoqu Wang,Limin Wang,Yongchun Liu,Raj Kumar,Li Liu,Qiulan Huang,Dujuan Huang,You-Jun Fan,Du-Hong Chen,Wei Chen
For large-scale hydrogen production from electrocatalysis of water, the Ni- and/or Fe-based catalysts were commonly used but limited by the ultrahigh overpotential and poor stability at high current density (>500 mA cm−2). Here, the reconstruction of M(OH)x/Fe3O4 (M = Ni, Fe) arrays has been fabricated for boosting the oxygen evolution reaction (OER). The prepared M(OH)x/Fe3O4 grewon iron foam (M(OH)x/Fe3O4/IF) catalysts exhibited low overpotentials of 214 and 311 mV for OER at the current densities of 50 and 500 mA cm−2, respectively, besides the excellent stability up to 70 h of operation at a current density of 10 mA cm−2 in 1 M KOH. The in situ Raman spectra revealed that, the reconstruction of M(OH)x/Fe3O4/IF boosted the OER activity. Theoretical calculation revealed favorable absorption of O2 at Ni site of M(OH)x/Fe3O4/IF during OER. This work highlights the reconstruction structurally definite catalysts for promoting the catalytic activity toward OER and the large-scale electrocatalysis of water.
研究领域:
材料科学
·
电化学
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2017
·
IF 3.615
He Hao,Yue Chang,Wenjun Yu,Lan-Lan Lou,Shuangxi Liu
Novel hierarchical MCM-68 zeolite materials were successfully prepared by two simple, effective and environmentally friendly methods: H 2 O 2 microexplosion under microwave and NH 3 (aq) treatment. The characterization of the materials with powder XRD , SEM, TEM, N 2 -sorption, and NH 3 -TPD proved that abundant mesopores across zeolite crystals were created while the microporous MSE framework was well preserved. The mesopore volume of hierarchical MCM-68 zeolites is up to 0.19 cm 3 g −1 . The crystallinities of hierarchical ones and microporous MCM-68 are nearly the same according to the XRD result. The acidities of hierarchical MCM-68 are generally lower than their raw materials. Gas-phase isomerization reaction of m -xylene was carried out over these hierarchical MCM-68 zeolites as well as HMCM-68 zeolite under different conditions to characterize the catalytic property of newly prepared hierarchical zeolites. It was found that the m -xylene conversion and disproportionation/isomerization rate ratio were closely related to the created mesopores in hierarchical MCM-68 zeolites under high reaction temperature and low weight hourly space velocity (WHSV). Moreover, these hierarchical MCM-68 zeolites exhibited improved resistance to coke formation compared with HMCM-68.
研究领域:
化学工程
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材料科学
·
催化反应工程
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高影响因子
危险品化学品经营许可证（带存储）