RARE METALS
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2016
·Vol. 41
·期 12
·4273-4278
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IF 0.957
Huang Shuang,Xu Hua-Lan,Wang Lei,Zhong Sheng-Liang
Rice-like Gd(OH) 3 nanorods were successfully prepared through a facile and rapid microwave-hydrothermal synthesis method without using any surfactants or templates. X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED) and energy-dispersive spectroscopy (EDS) were used to characterize the samples. Results show that the nanorods have an average length of 400 nm and an average diameter of 50 nm. The effects of reaction parameters such as reaction temperature and time on the preparation were briefly investigated. It is found that the crucial factor for the formation of rice-like Gd(OH) 3 nanorods is reaction time. When the rice-like Gd(OH) 3 nanorods was codoped with Yb 3+ and Er 3+ , strong upconversion emissions could be observed under the excitation of 980-nm-laser, and the calculated CIE color coordinates falls within the yellow region, which may be potential candidate for optical materials.
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Journal of Physical Chemistry C
·
2017
·
IF 4.536
Qing Zheng,Ximing Huang,Yao Liu,Xiaotong Fang,Jie Zhang,Huibo Shao
Quantification of the amount of intermolecular hydrogen bonding between ferrocenemethanol and 3-mercaptopropanoic acid on gold was performed by cyclic voltammetry as well as by the finite element simulation, displaying a proof-of-concept that the slight changes of cyclic voltammetry features are used potentially for interpreting the weak molecular interactions. Ferrocenemethanol at a bulk concentration level of 0.5 mM adsorbs on the 3-mercaptopropanoic acid surface by hydrogen bonding, with the fractional surface coverage ranging from 0% to 14% of a monolayer in accordance with the surface coverage of 3-mercaptopropanoic acid which was explored by electrochemical quartz crystal microbalance. The intermolecular hydrogen bonding between ferrocenemethanol and the mercaptopropanoic acid was found to exhibit a Langmuir-type adsorption with the average value of K being 0.24 mM–1. The intermolecular hydrogen bonding between FcCH2OH and the artificial self-assembled monolayer (3-mercaptopropanoic acid) is evident, and the study on quantification of intermolecular hydrogen bonding with this artificial model is meaningful for understanding the molecular recognition events involved in the cell membrane.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2017
·
IF 3.454
Anmeng Deng,Laihui Luo,Weiping Li,Feifei Wang,Yaojin Wang
Developing Na 0.5 Bi 0.5 TiO 3 -based magnetoelectric (ME) coupling composites with higher depolarization temperature is highly valuable for the environment-friendly smart electronic devices. We have developed a new kind of 0-3 type 0.94Na 0.5 Bi 0.5 TiO 3 -0.06BaTiO 3 : x CoFe 2 O 4 (NBTBT: x CFO, x = 0, 0.1, 0.2, 0.3) composite ceramics with a deferred depolarization temperature, together with an additional strong ME coupling of 9.2 mV/cm·Oe for the NBTBT:0.2CFO. The basic structure, ferroelectric/ferromagnetic properties, and the depolarization temperature of the NBTBT: x CFO composite ceramics were investigated. It was found that an enhancement of depolarization temperature (>25 °C) was obtained in these 0-3 type composites relative to the pure NBTBT ones (115 °C vs 90 °C). The mechanism of the enhanced depolarization temperature of the composites is discussed. The present results demonstrate that NBTBT: x CFO composites have great potential for ME devices.
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CHEMICAL ENGINEERING JOURNAL
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2017
·
IF 6.216
Lingjun Bu,Chen Bi,Zhou Shi,Shiqing Zhou
A kind of green tea extract, epigallocatechin-3-gallate (EGCG) was introduced into Fe 2+ activated persulfate (Fe 2+ /PS) system to enhance the degradation efficiency of atrazine. The involvement of EGCG improved atrazine degradation significantly in the pH range of 2.0–7.0, which could be interpreted by the strong reducing and chelating ability of EGCG. EGCG showed a better performance than hydroxylamine and ascorbic acid in modified Fe 2+ /PS systems, as the presence of EGCG could not only accelerate the transformation of Fe 3+ to Fe 2+ , but prevent the formation of iron precipitation. Batch experiments were conducted and atrazine degradation depended upon the dosage of EGCG, persulfate, Fe 2+ , and other water quality parameters including initial pH, co-existing anions and natural organic matters. Radical quenching test and electron paramagnetic resonance (EPR) analysis were also performed and results showed that two kinds of radicals (sulfate radicals and hydroxyl radical) were verified to exist and play a significant role on atrazine degradation in the Fe 2+ /EGCG/PS system. Moreover, possible intermediates of atrazine were identified by HPLC/MS/MS and degradation pathways of atrazine and EGCG were proposed. This study aims to provide a comprehensive understanding on the potential application of EGCG to enhance degradation of refractory organics in water.
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JOURNAL OF MOLECULAR LIQUIDS
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2016
·
IF 2.74
Xue Wang,Mingjie Wang,Zhiyun Chen,Xiaoyi Tao,Weiguo Shen
The liquid-liquid equilibrium data and the specific heat capacities for the binary room temperature ionic solution {1-butanol + 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide} have been reported. The corresponding critical exponents β and α were obtained and found to be well coincided with the 3D-Ising criticality. The critical complete scaling theory was applied to successfully describe the asymmetric behavior of the diameter of the coexistence curve with the consideration of the heat capacity related term. The large values of the reduced critical density, the reduced critical temperature and the critical amplitude related to the heat capacity were deduced, which indicated a solvophobic criticality of the studied system.
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RSC Advances
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2016
·Vol. 6
·期 96
·94113-94118
·
IF 3.289
Weigang Li,Gang Li,Dan Liu
A new type of magnetic core–shell structured MOF composite (Fe3O4/IRMOF-3) was successfully prepared by a facile mixed solvothermal method. Fe3O4 nanoparticles and polyvinylpyrrolidone (PVP) are the magnetic core and promoter, respectively. Fe3O4 nanoparticles are encapsulated completely inside the MOF matrix. PVP not only functions as the stabilizer to make the Fe3O4 nanoparticles well dispersed but also provides the ability to adsorb IRMOF-3 precursors onto the surface of the Fe3O4 nanoparticles. The composite possesses high crystallinity, porosity characteristics, a rapid magnetic response and good stability. In addition, the catalytic performance of Fe3O4/IRMOF-3 is investigated via the Knoevenagel condensation reaction of benzaldehyde and ethyl cyanoacetate. The conversion of ethyl cyanoacetate reaches 98.3% after 4 hours. More importantly, the catalyst can be quickly separated by a magnet and reused many times.
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RSC Advances
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2016
·Vol. 6
·期 76
·72698-72702
·
IF 3.289
Qianqian Wu,Zian Wang,Jiale Li,Shuang Qiu,Duxia Cao,Zhiqiang Liu,Ruifang Guan
Two novel 3-hydroxyflavone derivatives were synthesized by a one-step simple condensation, cyclization and subsequent oxidation reaction catalyzed by pyrrolidine, which shows great convenience compared with the traditional method. The compounds can recognize cyanide anions at very low concentration with remarkable spectral shift and an obvious color change from yellow to colorless. The bonding mechanism analysis via NMR experiments and mass spectra indicates that cyanide anions induce the deprotonation of the compounds.
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FOOD CHEMISTRY
·
2024
·
IF 8.5
Ruge Lin,Yi Wang,Huan Cheng,Xingqian Ye,Shiguo Chen,Haibo Pan
In this study, we addressed the limited water solubility of curcumin by utilizing epigallocatechin-3-gallate to form nanoparticles through self-assembly. The resulting particles, ranging from 100 to 150 nm, exhibited a redshift in the UV–visible spectrum, from 425 nm to 435 nm, indicative of potential π-π stacking. Molecular docking experiments supported this finding. Curcumin loaded with epigallocatechin-3-gallate showed exceptional dispersibility in aqueous solutions, with 90.92 % remaining after 60 days. The electrostatic screening effect arises from the charge carried by epigallocatechin-3-gallate on the nanoparticles, leading to enhanced retention of curcumin under different pH, temperature, and ionic strength conditions. Furthermore, epigallocatechin-3-gallate can interact with other hydrophobic polyphenols, improving their dispersibility and stability in aqueous systems. Applying this principle, a palatable beverage was formulated by combining turmeric extract and green tea. The nanoparticles encapsulated with epigallocatechin-3-gallate show potential for improving the applicability of curcumin in aqueous food systems.
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PubMed
高影响因子
Food Chemistry-X
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2024
·
IF 6.5
Jia Cheng Qian,Heng Peng Zhang,Yi Wang,Dan Liu
Cruciferous vegetables (CVs) are globally consumed with some health benefits believed to arise from indole-3-carbinol (I3C), a labile phytochemical liberated from indole glucosinolates, but few reports describe the effect of cooking on I3C reactions. Here, we present heat-promoted direct conversions of I3C in broccoli florets into indole derivatives, which are unique in the N -indolylmethylation and -hydroxymethylation of indole nuclei by 3-methyleneindole and formaldehyde formed in situ from the I3C dehydration and the dimerization of I3C to 3,3′-diindolylmethane (DIM), respectively. Such N -substituted indoles were found in a range of 0.4–4.6 μg per gram of steamed broccoli florets, with a novel compound N -(indol-3-ylmethyl)-3,3′-diindolylmethane (DIM-1) bio-evaluated to inhibit A375 cells with an IC 50 value of 1.87 μM. In aggregation, the investigation discloses the promoting effect of heating on the I3C transformation in CVs and identifies DIM-1 as an anti-cancer drug candidate, and thus updates the knowledge of I3C and bioactive derivatives thereof.
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PubMed
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2024
·
IF 5.7
Lichun Guo,Mengqing Zhang,Ying Fei,Wei Zhao
This study examines the inhibitory effects of a range of sweeteners on α-glucosidase. Our findings revealed that only one natural sweetener, namely, glycyrrhetinic acid 3-O-mono-beta-d-glucuronide (GAMG), derived from licorice, exhibited a mixed-type inhibition against α-glucosidase with a IC50 value of 0.73 ± 0.05 mg/mL. The fluorescence intensity of α-glucosidase was quenched by GAMG in the formation of an α-glucosidase–GAMG complex. GAMG has been shown to induce conformational changes in α-glucosidase, likely through hydrogen bonding, van der Waals force, and alkyl–alkyl interactions with amino acid residues, including Arg 281, Leu 283, Trp 376, Asp 404, Asp 443, Trp 481, Asp 518, Phe 525, Ala 555, and Asp 616. Additional animal validation experiments demonstrated that GAMG slowed starch digestion, thereby attenuating the postprandial glycemic response. Taken together, these findings provide evidence that GAMG is a natural sweetener with potent inhibitory activity that selectively targets α-glucosidase. This study supports the use of GAMG as a natural sweetener, which holds a high biological value and may be beneficial for managing postprandial hyperglycemia.
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Journal of Water Process Engineering
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2024
·
IF 6.3
Yingying Liu,Wanjing Cui,Xiuge Chen,Ming Wang,Haifeng Zhang,Zhi Wang
Reverse osmosis (RO) membrane technology is applied widely on the water desalinization for relieving the challenge of freshwater scarcity. Polyamide (PA) membranes with superior water flux and rejection in the RO process are currently in high demand. In this study, a novel reactive additive N-(3-Aminopropyl)-imidazole (N-IM) was utilized to optimize the interfacial polymerization (IP) process and enhance PA-RO membrane performance. N-IM made the nascent film more porous and created an RO membrane with a thicker PA separation layer. The modified membrane exhibited a more hydrophilic surface, ascribing to more carboxylic acid groups. This membrane exhibited an improved water flux, increasing from 59.67 L/(m 2 ∙h) of original membrane to 82.76 L/(m 2 ∙h) of the modified membrane with the addition of 0.5 % w/v N-IM concentration, which was attributed to the enhanced hydrophilicity and increased water trapping capacity provided by the imidazole ring in N-IM. Additionally, the NaCl rejection increased from 98.75 % to 98.97 %, which can be attributed to the thicker separation layer and more carboxylic acid groups. In addition, the membrane showed excellent stability of performance and good pH stability. The study presents a novel approach to producing RO membranes with exceptional performance.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Xiuna Tian,Youfeng Wen,Hongjian Dou,Lingyuan Wu,Changjun Wang,Youzi Zhang
In the clinical diagnosis and treatment of diseases, there is an urgent need to find suitable materials for real-time temperature monitoring of biological tissues. The paper provides a detailed study of the effects of Nd 3+ doping concentration on the negative thermal expansion performance and NIR fluorescence properties of Sc 2 (MoO 4 ) 3 . The results obtained from Rietveld refinement of in-situ XRD data indicates that high concentration of Nd 3+ doping significantly influences the negative thermal expansion performance of the material, as well as alters the temperature-dependent changes in NIR fluorescence intensity and lifetime. In addition, a NIR fluorescence lifetime temperature probe doped with Nd 3+ /Yb 3+ /Er 3+ has been constructed. When the temperature increased from 303 K to 403 K, the fluorescence intensity of the probe at 1538 nm increased by a factor of 127.5. Furthermore, as the temperature rose from 323 K to 403 K, the fluorescence lifetime of the probe at 1538 nm extended from 41.93 μs to 204 μs. By utilizing the lifetime of Er 3+ for temperature sensing, a relative sensitivity of 6.03%K −1 was achieved at 323 K, indicating significant potential application value of this probe in the field of biological temperature measurement.
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