INORGANICA CHIMICA ACTA
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2022
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IF 3.118
Jing-Wen Zhang,Ling-Xiao Wang,Xun Cheng,Lin-Lin Hou,Jing-Zhe Li,Chun-Feng Wang,Xiao-Wei Yan,Kuan-Guan Liu
To prepare new series of mixed-valence polynuclear Cu(I/II) clusters, chloride ions are introduced to construct two mixed-valence polynuclear Cu(I/II) clusters for evaluating their photothermal conversion performance. X-ray single-crystal structural analysis reveals their molecular formula are {Cu II [Cu I (Cy 3 P)] 4 (BTA) 4 Cl 2 }·5DMF (I·5DMF, Cy 3 P = triscyclohexylphosphine, BTA = benzotriazole, DMF = N, N -Dimethylformamide) and {(Cu II ) 3 [Cu I (PPh 2 Py)] 6 (BTA) 8 Cl 4 }·6DMF (II· 6 DMF, Ph 2 PyP = diphenyl-2-pyridylphosphine), respectively. X-ray Photoelectron Spectroscopy (XPS) and Electrospray Ionization Mass Spectrometry (ESI-MS) confirm their chemical composition and charge state. The reported two mixed-valence Cu I /Cu II clusters have different nucleus (penta-nucleus for I and nano-nucleus for II) and different proportion of valence state (1/4 for I vs 1/2 for II). The thermogravimetric analysis (TGA) reveals the thermal stability of both clusters is less than our previously reported penta-nucleus mixed-valence Cu I /Cu II clusters. Contrastively studies of their optical absorption properties by the solid-state ultraviolet diffuse reflection spectra indicate high-nucleus mixed-valence Cu I /Cu II cluster with higher proportion of Cu II is superior to those penta-nucleus mixed-valent Cu(I/II) clusters. With the introduction of chloride ions to the structures of mixed-valence Cu I /Cu II clusters have not remarkably changed their photothermal conversion performance. This study provides a practicable way to construct new mixed-valence Cu I /Cu II clusters with different photothermal conversion performance.
研究领域:
化学
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材料科学
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DOI
高影响因子
Frontiers of Materials Science
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2023
·Vol. 17
·期 3
·1-14
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IF 2.7
Zhu Mingliang,Li Hongwei,Yuan Ruixia,Qian Huijuan,Wang Huaiyuan
In this study, a novel diethylene triamine penta(methylene phosphonic acid) (DTPMPA)- and graphene oxide (GO)-modified superhydrophobic anodized aluminum (DGSAA) coating was fabricated. The obtained coatings were characterized by scan electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, and Raman analysis. After immersion in the supersaturated CaCO 3 solution for 240 h, the scaling mass of the DGSAA coating is only 50% of that of the SAA coating. The excellent anti-scaling performance of the DGSAA coating comes from three barriers of the air layer, the DTPMPA:Ca 2+ chelate, and the lamellar GO, as well as the further active anti-scaling of DTPMPA:Ca 2+ at the coating-solution interface. DTPMPA and GO at the surface of the DGSAA coating exhibit an insertion structure. In the electrochemical impedance spectroscopy measurement, the impedance modulus of the DGSAA coating is three orders-of-magnitude higher than that of the anodized aluminum. The synergistic effect of DTPMPA stored in the porous structure of anodized aluminum and the barrier protection of superhydrophobicity and GO contributes to the excellent comprehensive performance of the DGSAA coating. This research provides a new perspective for designing anti-scaling and anti-corrosion superhydrophobic bi-functional coatings.
研究领域:
材料科学
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表面工程
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化学工程
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DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2022
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IF 3.898
Zhenyu Wu,Zengxi Li,Chunshan Li
The bare amorphous Al 2 O 3 -AlPO 4 and Cs/Al 2 O 3 -AlPO 4 catalysts were developed for the aldol condensation of methyl acetate with formaldehyde to methyl acrylate. The structure and property of catalyst were characterized by XRD, XPS, BET, Pyridine-IR, FT-IR, 27 Al-MASNMR, NH 3 -/CO 2 -TPD and SEM. The correlation between structural features and acid-base properties was established, and the loading effect of the cesium species was investigated. Due to cooperative catalytic effects between the penta-coordinated Al and Al 2 O 3 , the weak-II acid and medium acid site densities and the product selectivity were improved. While the basic site densities of these catalysts were almost in proportion to the conversion of methyl acetate. The loaded Cs could form new basic sites and change the distribution of acid sites which further enhance the catalytic performance. As a result, the 10Cs/8AlP was proved to be an optimal catalyst with the yield and selectivity of 21.2% and 85% for methyl acrylate respectively. During the reaction, a deactivation behavior was observed on 10Cs/8AlP catalyst due to the carbon deposition, however, it could be regenerated by thermal treatment in the air atmosphere at 400 °C.
研究领域:
化学工程
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催化材料科学
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2026
·
IF 11.3
Pingxiu Zeng,Zhenzhen Ma,Hongmei Hu,Meiying Ye,Yuanchao Wang,Heyong Cheng
Species-specific toxic, metabolic, and bioavailable properties of commonly coexisting metal(loid)s—particularly Cr, As, Cd, Hg, and Pb—necessitate their speciation analysis. Because of the complexity and diversity in chemical form, concentration (from picograms to milligrams per liter), interactions, and sample matrix, multi-elemental speciation methods are preferred over traditional mono-elemental speciation methods. However, current multi-elemental speciation methods have primarily associated with only two metal(loid)s. Herein, we developed an efficient, sensitive, inexpensive, and green methodology for the simultaneous penta-elemental speciation analysis of Cr, As, Cd, Hg, and Pb using high-performance liquid chromatography combined with inductively coupled plasma mass spectrometry and online solid-phase extraction (SPE) preconcentration. Food samples were extracted with a mixture of 0.1 M HNO 3 and 5 mM L -cysteine (Cys), chosen among 10 extractants for its good extraction efficiency, low noise, and minimal chromatographic interference. The proposed method offered a short analysis time (10 min for separation and 2 min for enrichment), excellent linearity (R 2 > 0.995), low detection limits (0.02 −0.12 μg L −1 in SPE-free mode; 0.02 −3.2 ng L −1 with online SPE), high precision (0.2 −2.4 %), and good recovery (81 −117 %) using an aqueous mobile phase of 5 mM tetrabutylammonium hydroxide + 5 mM Cys (pH 4.7). This demonstrates its good applicability to both food and water samples. Despite the incompatibility of Cr(VI) with As(III) and Cys, the proposed method excels in analytical, economic, and environmental aspects (maximizing the number of metal(loid)s within minimized analytical time using aqueous mobile phases), showing significant potential for a wide range of food, environmental, and biological samples.
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产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
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2020
·
IF 3.594
Xue Zhang,Jian Yang,Chao Wang,Yakun Sun,Zhaosheng Liu,Yanping Huang,Haji Akber Aisa
1,2,3,4,6-Penta-O-galloyl- β - d -glucose ( β -PGG) is one of active component of polyphenol tannic acid in the rhizome of radix paeoniae alba , and isolating and purifying β -PGG from crude extract of Paeonia lactiflora Pall is rather challenge work. In this paper, to reduce the embedding of imprinted sites and increase the binding capacity, β -PGG imprinted monoliths were synthesized using a strategy of combination of hydrophilic macromonomer with metal ions as pivot. With a small side chain of oligoethylene glycol, oligo (ethyleneglycol) methyl ether methacrylate (OEG) was chosen as the hydrophilic macromonomer. 4-Vinylpyridine (4-VP) and ethyleneglycol dimethacrylate was used as functional monomer and crosslinker, respectively, and Ni 2+ was adopted as metallic pivot. Polymerization parameters, including the ratio of functional monomer/template, ratios of 4-VP to Ni 2+ , and ratios of OEG to 4-VP on affinity of the resulting molecularly imprinted polymer (MIP) were systematically investigated. The structure and morphology of the obtained monolithic MIP was studied by field emission scanning electron microscopy and multipoint BET measurement. The greatest imprinting factor can be achieved to 68, which gave rise to excellent selectivity of the resulting MIP. When using the MIP as SPE absorbent, the mean recoveries for β -PGG were 74.1% with purity of 98.35%. The results demonstrated that the combination of metal ion pivot with hydrophilic macromonomer is effective approach to the balance of rigidity of imprinting cavities and polymer flexibility and increase the selectivity of the resulting MIP.
研究领域:
中药化学
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分析化学
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产品关联
DOI
高影响因子
JOURNAL OF DENTISTRY
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2022
·
IF 4.991
Fei Han,Xin Jin,Xiaojun Yuan,Zehua Bai,Qi Wang,Haifeng Xie
Objectives To evaluate the interactions of two phosphate ester monomers [10-methacryloyloxydecyl dihydrogen phosphate (10-MDP) and dipentaerythritol penta-acrylate phosphate (PENTA)] with hydroxyapatite and collagen and understand their influence on dentine bonding. Methods Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction, nuclear magnetic resonance, ultraviolet-visible, and molecular docking were applied for separately evaluating the interactions of two monomers with hydroxyapatite and collagen. Hydrophilicity tests and morphological observation were employed to characterize pretreated dentine. Microtensile bond strength (μTBS) and nanoleakage were investigated to evaluate the bonding performance. Hydroxyproline assay, in situ zymography, and matrix metalloproteinase-9 (MMP-9) activity assay were used to confirm the MMP inhibition. Results Chemoanalytic characterization confirmed the interactions of 10-MDP and PENTA with hydroxyapatite and collagen. The interactions of PENTA were weaker than 10-MDP. PENTA possessed better dentine tubule sealing after etching than 10-MDP. Dentine treated with PENTA was more hydrophilic than 10-MDP. 10-MDP and PENTA treating significantly increased the initial μTBS than the control group without primer conditioning. μTBS decreased significantly during aging, and the decrease was more severe in the PENTA group than 10-MDP. The 10-MDP and PENTA groups exhibited relatively less fluorescence than the control. The relative inhibition percentages of MMP-9 decreased in the order of 10-MDP–Ca salt, 10-MDP and PENTA. The 10-MDP, PENTA, and 10-MDP–Ca salt groups showed significantly lower hydroxyproline contents than the control. Conclusions Although PENTA adsorbed on hydroxyapatite, it did not form a stable calcium salt. The interactions of 10-MDP with hydroxyapatite and collagen are different than those of PENTA. Clinical significance The sealing of dentinal tubules by PENTA and the inhibition of MMP by 10-MDP and its calcium salts contribute to improving the dentine bonding durability.
研究领域:
牙科材料
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材料科学
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生物材料
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牙科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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