RESEARCH ON CHEMICAL INTERMEDIATES
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2022
·Vol. 48
·期 8
·3347-3357
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IF 3.134
Zhang Xiangxiang,Zhou Man,Zhong Yang,Zhang Letian,Kang Jianjian,Wang Lingzhi
Co(OH) 2 modified TiO 2 (Co(OH) 2 /TiO 2 ) was fabricated by a simple precipitation method and applied as a surface enhanced Raman scattering (SERS) substrate. Using triphenylmethane dye acid blue 83 as the analyte, the SERS substrate showed high sensitivity with a detection limit of 1 × 10 –7 M and high signal reproducibility with a relative standard deviation of 8.9%. Moreover, the substrate can also be used to in situ monitor the catalytic degradation of Acid blue 83. In addition, compared with cationic triphenylmethane dye, the Co(OH) 2 /TiO 2 substrate presented stronger SERS activity towards anionic counterparts. The easy preparation and high sensitivity and selectivity towards anionic dyes of Co(OH) 2 /TiO 2 provides a robust alternative for promoting the practical application of semiconductor-based SERS substrate in selective detection.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2022
·Vol. 105
·期 9
·5638-5648
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IF 4.186
Daixiong Zhang,Qing Xiang
Nafion is suggested as an efficient assistant in preparing supercapacitor by employing nanoparticles. In this work, using a bi-additive of 0.10-mM NaOH + 0.10 g L −1 Nafion, Nafion-assisted electrophoretic co-deposition of Bi 2 O 3 –multiwalled carbon nanotubes (MWCNTs) coating is successfully realized in ethanol solvent. The capacitance performances of the electrophoretic coatings in 6.0-M KOH electrolyte are investigated by cyclic voltammetry and galvanostatic charge–discharge techniques. Comparing with Bi 2 O 3 coating prepared with electrophoretic deposition (EPD) by employing other additive (such as polyethyleneimine), the Bi 2 O 3 coating prepared by Nafion-assisted EPD shows a better capacitance performance. Benefiting from the improvement in coating conductivity caused by MWCNTs, with a small additional amount of 4.0 wt.%, the Bi 2 O 3 –MWCNTs coating exhibits an amazing 164% increase of mass-specific capacitance (473 F g −1 at the current density of 1.0 A g −1 ) in comparison with pure Bi 2 O 3 coating (179 F g −1 at the current density of 1.0 A g −1 ). The cyclic stability test exhibits excellent capacitance retention of 88.7% over 3000 cycles at a constant current density of 10.0 A g −1 . This work combines the advantages of MWCNTs, Nafion, and EPD to provide a facile route for preparing Bi 2 O 3 -based coating as a high-performance supercapacitor electrode.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
·
IF 9.965
Meichun Qin,Shiying Fan,Xinyong Li,Moses O. Tade,Shaomin Liu
Electroreductive C O coupling provides a prospective strategy for biomass derivative upgrading via reducing the number of oxygen-containing functional groups and increasing their molecular weight. However, exploring superior electrocatalysts with effective reactivity and high selectivity for target products are still a challenge. In this work, single atom Au surface derived NiMn 2 O 4 (SACs Au−NiMn 2 O 4 ) spinel synergetic composites were fabricated by a versatile adsorption-deposition method and applied in electroreductive self-coupling of benzaldehyde to dibenzyl ether . The SACs Au–NiMn 2 O 4 spinel synergetic composites enhanced electroreductive coupling of benzaldehyde, significantly improved the yield and selectivity of dibenzyl ether. Systematic characterizations and density functional theory calculation revealed that atomically dispersed Au occupied surface Ni 2+ vacancies, which played a dominated role in C O coupling of benzaldehyde. Detailed calculation results showed that benzaldehyde preferred to adsorb on Ni octa-hedral sites of NiMn 2 O 4 spinel synergetic structure, single atom Au surficial derivation over NiMn 2 O 4 further reduced the adsorption energy (E ads ) of benzaldehyde on SACs Au−NiMn 2 O 4 , thus the C O coupling of benzaldehyde to dibenzyl ether was promoted. Moreover, single atom Au surficial derivation lowered the energy barrier of rate-determining step, facilitated the formation of dibenzyl ether species. Our work also paves an avenue for rational design single atom materials using spinel as support.
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高影响因子
JOURNAL OF PHARMACEUTICAL SCIENCES
·
2022
·
IF 3.784
Jiawei Han,Yuanfeng Wei,Luyuan Li,Yutong Song,Zunting Pang,Shuai Qian,Jianjun Zhang,Yuan Gao,Weili Heng
In the previous study, the development of amorphous curcumin (CUR) aimed to enhance the solubility/dissolution of CUR by disrupting its crystal lattice, but it unexpectedly showed a decreased dissolution than its crystalline counterpart on account of gel formation in its dissolution process. Whether such gelation could be eliminated by co-amorphous strategy was answered in this study. Herein, CUR by co-amorphization with chlorogenic acid (CHA) was successfully prepared using quench cooling. The formed co-amorphous material (namely CUR-CHA CM) eliminated the gelation and hence performed superior dissolution performance than crystalline/amorphous CUR. Meanwhile, it exhibited higher physical stability than amorphous CUR during dissolution as well as under long-term/accelerated conditions. To further study the such enhancement mechanism, the internal molecular interactions were investigated for CUR-CHA CM in the solid state as well as in aqueous solution. FTIR and solid-state 13 C NMR spectra confirmed that intermolecular hydrogen bonds formed between CUR and CHA after co-amorphization. Furthermore, the nucleation of CUR was significantly inhibited by CHA in an aqueous solution, thus maintaining the supersaturated dissolution for a long time. The present study offers a feasible strategy to eliminate gelation and enhance stability of amorphous solids by co-amorphization and crystallization inhibition.
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高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Reziwanguli Yantake,Palidan Aierken,Aierken Sidike
The cyan emission band contains blue and green light regions, which can simplify the fabrication process of white light-emitting diodes and help promote the development of solid-state lighting. In this paper, a series of Eu 2+ singly doped and Eu 2+ and Li + co-doped cyan light-emitting KAlSiO 4 : x Eu 2+ , y Li + materials were synthesized using the high temperature solid-state method. It was found that the incorporation of 10% Li + could increase the emission intensity of the KAlSiO 4 :0.02Eu 2+ sample by up to a factor of ∼3. This also shifted the emission color of the sample from blue-cyan (472 nm) to cyan (485 nm), and the quantum yield was increased from 71.5% to 93.3%. When the temperature is increased to 150 °C, the peak emission intensity was increased from 75.9% to 92.7% of that at room temperature. DFT calculations were used to demonstrate that the KAlSiO 4 phosphor host possesses a wide bandgap of 4.86 eV and the experimentally-determined optical bandgap of the phosphor was 5.6 eV. The phosphor was combined with a commercial red phosphor, and these together were used as the emitting components in a white LED package. The characteristics of the white LED when using two representative samples of the phosphor (KAlSiO 4 : 0.02Eu 2+ and KAlSiO 4 : 0.02Eu 2+ , 0.1Li + ) were examined; these white LEDs had color rendering indices of 82 and 95, and color temperatures of 5656 K and 4126 K respectively. This work demonstrates the significant potential that KAlSiO 4 :0.02 Eu 2+ , 0.1 Li + phosphors have in the field of LED lighting.
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COLLOIDS AND SURFACES B-BIOINTERFACES
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2021
·
IF 5.268
Jingyi Liu,Zhoutong Dai,Yu Zhou,Wangwang Tao,Hongxiang Chen,Zuyi Zhao,Xinghua Liao
In order to obtain drug delivery carriers with good stability in blood and high cellular uptake efficiency, carboxyl groups and tertiary amine groups were respectively introduced into polyurethane to synthesize two kinds of amphiphilic polyurethanes with opposite charges (PUC and PUN). Their structures were characterized by Fourier transform infrared (FTIR) spectroscopy, nuclear magnetic resonance ( 1 H NMR) spectroscopy and gel permeation chromatography (GPC). PUC-PUN co-assembled nanomicelles were prepared by electrostatic interaction between PUC and PUN micelles , which showed acid-sensitive property. When the pH of the solution was decreased from 7.4 to 6.5, PUC-PUN-1 micelles showed negative-to-positive charge-reversal property among these micelles. The results of stability and cell experiments demonstrated that PUC-PUN-1 micelles not only had excellent stability in simulated normal physiological environment but also could obviously enhance the cellular uptake efficiency. PUC-PUN-1 micelles had low cytotoxicity against SGC-7901 and MGC-803 cells, whereas PUC-PUN-1/DOX micelles had higher cytotoxicity compared to pure DOX and PUN-1/DOX micelles. Moreover, the results of in vivo antitumor activity experiments showed that PUC-PUN-1/DOX micelles had better tumor inhibition ability and safety than pure DOX. In addition, the results of in vitro drug release experiments indicated that PUC-PUN-1/DOX micelles had almost no burst release or leakage of drugs in pH 7.4 environment. However, the drug release was accelerated in pH 5.0, which followed Fickian diffusion mechanism.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2021
·
IF 6.789
Xiao Xia,Liqiang Zhang,Zhanyao Li,Xueliang Yuan,Chunyuan Ma,Zhanlong Song,Guifang Chen
CaSO 4 reduction decomposition for CaO preparation provides a theoretical basis for the utilization of the industrial byproduct, gypsum. In this study, the effects of temperature (950 °C–1150 °C), CO 2 /CO partial-pressure ratio (1–15), CO concentration (1%–5%), and O 2 concentration (1%–7%) on the preparation of CaO from CaSO 4 by CO reduction decomposition under different reaction atmospheres were investigated. The physical properties of CaO prepared by the decomposition of CaSO 4 and CaCO 3 were analyzed and compared. Finally, the reaction mechanism of the reduction decomposition of CaSO 4 to CaO by CO was studied. The findings reveal that CaSO 4 can be completely decomposed into CaO when the reaction temperature exceeds 1000 °C, CO% ≥ 2%, and P(CO 2 )/P(CO) ≥ 8. Furthermore, the addition of an appropriate amount of O 2 can improve the yield of CaO in the products. In an O 2 –CO–N 2 atmosphere, where O 2 % = 7% and CO% = 16%, CaSO 4 can be completely decomposed into CaO without the addition of CO 2 . The physical properties of CaO prepared by the reduction and decomposition of CaSO 4 are better than those prepared by the calcination of CaCO 3 . An analysis of the reaction mechanism of the reduction decomposition of CaSO 4 by CO reveals that CaSO 4 generates CaO and CaS simultaneously. In addition, CaS can react with unreacted CaSO 4 to form CaO. Furthermore, it can react with CO 2 to produce CaO if an appropriate amount of CO 2 is added to the reaction atmosphere. The secondary interactions of CaS with CaSO 4 and CO 2 can significantly improve the yield of CaO in the product.
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高影响因子
Energy & Environmental Materials
·
2021
·Vol. 6
·期 1
·e12273
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IF 15.122
Huanhuan Zhang,Ke Zhang,Saima Ashraf,Yanping Fan,Shuyan Guan,Xianli Wu,Yushan Liu,Baozhong Liu,Baojun Li
Boron hydrides release an abundant amount of hydrogen in the presence of a suitable catalyst. Accelerating bimolecular activation kinetics is the key to designing cost-effective catalysts for borohydride hydrolysis. In this study, the bimolecular activation of a polar O–Co–P site demonstrated superior hydrogen-generation kinetics (turnover frequency, TOF = 37 min −1 , 298 K) and low activation energy (41.0 kJ mol −1 ) close to that of noble-metal-based catalysts. Through a combination of experiments and theoretical calculations, it was revealed that the activated dangling oxygen atom in the Co–O precursor effectively replaced via surface-phosphorization because of strong electronic interactions between the dangling oxygen and P atoms. This substitution modulated the local coordination environment and electronegativity around the surface Co sites and formed a new polar O–Co–P active site for optimizing the activation kinetics of ammonia borane and water. This strategy based on bimolecular activation may create new avenues in the field of catalysis.
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OPTICAL MATERIALS
·
2021
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IF 3.08
Xing Zhang,Xinyou Huang,Ziyu Liu,Yagang Feng,Nan Jiang,Lexiang Wu,Zhaoxiang Yang,Tengfei Xie,Jiang Li
Ytterbium-doped yttrium oxide (5 at.%Yb:Y 2 O 3 ) nanopowders were synthesized by the co-precipitation method in this work. The influence of the molar ratio of ammonium hydrogen carbonate to metal ions (NH 4 HCO 3 /M 3+ , defined as R) on the properties of the precursors and powders was studied. The powders calcined at 1100 °C from the precursors with different R showed the same phase as the pure cubic Y 2 O 3 . However, the agglomerations of the calcined powders were influenced by the R evidently and the 5 at.%Yb:Y 2 O 3 powders with R = 4.0 showed better dispersivity. Using the obtained powders as starting materials, 5 at.%Yb:Y 2 O 3 transparent ceramics were fabricated by vacuum sintering and hot isostatic pressing (HIP) post-treating. The 5 at.%Yb:Y 2 O 3 ceramics with R = 4.0 possessed the best optical quality with the in-line transmittance of 81.2% at 1100 nm with fine grains. In addition, the microstructures of the 5 at.%Yb:Y 2 O 3 transparent ceramics with different R values were also studied and the HIP post-treated ceramics exhibited homogeneous microstructures. Meanwhile, the absorption and emission cross-sections of the 5 at.%Yb:Y 2 O 3 ceramics were calculated to be 0.99 × 10 −20 cm 2 at 976 nm and 0.97 × 10 −20 cm 2 at 1031 nm, respectively. The gain spectra also were obtained from the absorption and emission spectra.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 15
·51921
·
IF 3.125
Hongxu Meng,Zhisong Li,Linbo Wu,Bo-Geng Li,Yumiao Hu,Kecheng Wang
Poly(ethylene 2,5-furandicarboxylate) (PEF) is a biobased polyester with high gas barrier properties, tensile modulus, and strength. In PEF chain, in addition to ethylene furandicarboxylate repeat unit, there is also a small amount of diethylene glycol furandicarboxylate (DF) unit which is formed by etherification side reactions. However, the effect of DF unit in a wide composition range on polymer properties is still unclear. In this study, random poly(ethylene-co-diethylene glycol 2,5-furandicarboxylate) (PEDF) copolymers were synthesized via melt copolycondensation of 2,5-furandicarboxylic acid, ethylene glycol and diethylene glycol. The copolymers were characterized and evaluated by intrinsic viscosity, 1 H NMR, thermal transition, thermogravimetric analysis, tensile, impact, and O 2 penetration tests. The copolymers are amorphous in the full composition range. The presence of less than 58 mol% DF unit in PEDFs neither improves the tensile ductility nor deteriorates the oxygen barrier performance, but reduces the glass transition temperature clearly. In comparison with poly(ethylene terephthalate), the PEDF copolymers containing <58 mol% DF unit have higher tensile modulus, strength, and O 2 barrier properties.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 45
·21350-21358
·
IF 3.591
Zhen-Zhen Ma,Yao Ma,Bing Liu,Ling Xu,Huan Jiao
Two cobalt metal–organic frameworks (Co-MOFs), [Ch]2[Co3(BDC)3Cl2] (1) and [Ch]2[Co3(BDC)4]·2DMU (2) (Ch+ = choline cation; H2BDC = terephthalic acid; DMU = 1,3-dimethylurea), were prepared through ionothermal reactions with deep eutectic solvents (DESs) of ChCl and DMU as the reaction media. The 1/GCE electrode with better current response was selected as the electrocatalyst. The detection performance of the 1/GCE electrode towards glucose is excellent with a wide linear range of 10–1200 μmol L−1, a detection limit of 3.2 μmol L−1 (S/N = 3), and a rapid response less than 3 s in 0.01 mol L−1 NaOH. 1 also exhibits high anti-interference with the existence of D-Man, D-Fru, DL-AA, and BA, long-term stability of 15 days and reproducibility for glucose detection. 1 was utilized to detect glucose in human serum and orange juice. The found glucose concentrations are very close to the added glucose concentrations in the selected situations with low RSD and high recoveries. This demonstrates that as a non-enzymatic glucose sensor, 1/GCE can detect glucose with high accuracy and reliability in different environments.
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JOURNAL OF CATALYSIS
·
2021
·
IF 7.92
Zhenhua Zhang,Liping Fan,Weiqi Liao,Feiyue Zhao,Cen Tang,Jing Zhang,Ming Feng,Ji-Qing Lu
Several CeO 2 -CuO/Cu 2 O nanocomposites with different CuO structures were used to identify the structure sensitivity of CuO in the CeO 2 -CuO/Cu 2 O catalyzed CO oxidation. The CO oxidation catalyzed by various CuO-CeO 2 interfacial sites involves a typical Mars-van Krevelen mechanism, in which the CuO-CeO 2 interfaces in the CeO 2 -CuO/c-Cu 2 O (cubes) nanocomposites are more intrinsically active, exhibiting ca. 15 kJ mol −1 lower activation energy than those in the CeO 2 -CuO/o-Cu 2 O (octahedra) and CeO 2 -CuO/d-Cu 2 O (rhombic dodecahedra) nanocomposites at CeO 2 loadings no less than 0.75 wt%. The higher activity is relevant to lower coordinated oxygen ions on CuO/c-Cu 2 O surface and thus better CO reactivity for the CeO 2 -CuO/c-Cu 2 O nanocomposites, which therefore indicates that the active oxygen species on CuO-CeO 2 interface should come from CuO rather than CeO 2 . Moreover, a highly active 13.2 %CeO 2 -CuO/c-Cu 2 O(s) catalyst for CO oxidation is realized on fine Cu 2 O cubes, which thus has high density of active sites.
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