RSC Advances
·
2021
·Vol. 11
·期 43
·26908-26914
·
IF 3.361
Jingyuan Liu,Xinyi Xue,Xin Zhou,Gang Chen,Wei Liu
3 wt% Ag2S/Zn5In2S8 (3A/Z5) and 3 wt% Ag2S/ZnIn2S4 (3A/Z1) were prepared by a two-step synthesis method. The first-principles calculations revealed that the anisotropic carrier transport property of Zn5In2S8 (Z5) is much stronger than that of ZnIn2S4 (Z1). Furthermore, unsynchronized electron and hole transport leads to higher bulk carrier separation efficiency in Z5. After accelerating the surface photocatalytic reaction rate by Ag2S modification, the differences between 3A/Z5 and 3A/Z1 in the bulk carrier separation were further enlarged. Photoelectrochemical tests confirmed that the bulk charge separation efficiency of 3A/Z5 is 13.70%, which is 7.4 times higher than 3A/Z1 (1.84%). Because of the high bulk carrier separation efficiency, the 3A/Z5 exhibits a promising photocatalytic hydrogen production rate, reaching 3189 μmol h−1 g−1. Through intuitive evidence, this work proves that material with stronger anisotropic conductivity has higher bulk carrier separation efficiency, thus has the potential to exhibit high photocatalytic hydrogen production performance.
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Sustainable Chemistry and Pharmacy
·
2021
·
IF 4.508
Jingbao Wang,Jing Jing,Li Feng,Hailin Zhu,Zhiyong Hu,Xuemei Ma
The corrosion inhibition behavior and adsorption mechanism of three novel synthetic surfactants in 1 M HCl solution on carbon steel were investigated. The PP results confirmed that all the synthetic surfactants behave as mixed-type inhibitors, while the EIS results validated the existence of a protective layer by the adsorption of inhibitor molecules on the carbon surface. T 3 was observed to offer the highest inhibition efficiency ( η w , 96.28%) at 1 mM by the static weight loss measurements due to two different hydrophobic chains which form a more compact film with the crosswise arrangement. SEM/EDS and XPS results revealed the formation of the surfactants film on the carbon steel surface. Molecular dynamics simulation (MD) was further executed to determine the adsorption mechanism in molecular level insights. In addition, a linear correlation between surface activity ( γ ) and corrosion inhibition efficiency ( η w ) was verified. The adsorption of the prepared surfactants followed the Freundlich isotherm at different concentration ranges. Moreover, the bilayer/multilayer adsorption mechanism was also proposed and confirmed by experimental, adsorption isotherm studies and MD. Hence, both MD simulations and experimental results revealed the analogous inhibition with the order follows: T 3 > T 2 > T 1 .
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JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 31
·17694-17708
·
IF 4.22
Bu Jingting,Zhou Zhipeng,Wu Xiaomin,Zhang Chenying,Li Zhen
Biomass-derived carbon materials are often applied in green energy storage systems like supercapacitors due to the abundance, facile access, low cost and nontoxicity. In this work, biomass-derived porous carbon spheres (PCSs) have been prepared by the carbonization and etching of sodium alginate (SA). Using polyacrylic acid (PAA) as a template, N-doped graphene quantum dots (N-GQDs) are grown evenly on the surface of the PCSs, which drastically improves the pseudocapacitive activity and electrical conductivity. The prepared N-GQD/PCS/PAA electrode has a remarkable specific capacitance of 419.3 F g −1 at 1 A g −1 . The symmetric supercapacitor assembled with N-GQD/PCS/PAA electrode exhibits a great specific capacitance of 337.5 F g −1 at 0.5 A g −1 . Particularly, the device displays an ultrafast charge/discharge rate of 2.5 V s −1 , demonstrating excellent rate capability and structural stability. The supercapacitor based on N-GQD/PCS/PAA possesses high energy density of 11.72 W h kg −1 and excellent cycle stability. A high mass loading (9.18 mg cm −2 ) with the energy density of 8.54 W h kg −1 is also investigated to realize the practical application for the device. In general, a novel biomass-derived carbon electrode modified with highly electrochemical active N-doped graphene quantum dots has been constructed to provide an effective way for high performance energy storage.
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RSC Advances
·
2019
·Vol. 9
·期 52
·30249-30258
·
IF 3.049
Feng Yang,Yu Liu,Tong Liu,Shuan Liu,Haichao Zhao
In this work, a water-soluble host–guest complex containing carboxymethylated beta-cyclodextrin (CM-β-CD) and an aniline trimer (AT) was synthesized. The application of AT–CM-β-CD as an inhibitor for alleviating the corrosion of Q235 carbon steel in 1 M HCl solution was investigated by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). Results showed that the inhibition efficiency was significantly increased in the presence of AT–CM-β-CD, and the inhibition efficiency was up to 99.2% when the concentration of AT–CM-β-CD was 250 mg L−1. Field emission scanning electron microscopy (SEM) and laser scanning confocal microscopy (LSCM) confirmed that the corrosion inhibitor had excellent corrosion inhibition effects due to the formation of an adsorption film on the surface of Q235 carbon steel. According to the data extracted from the Langmuir adsorption model, AT–CM-β-CD absorption involves both physisorption and chemisorption.
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COLLOIDS AND SURFACES B-BIOINTERFACES
·
2019
·
IF 3.973
Lishu Ren,Songchao Tang,Xuening Shen,Chao Gao,Yun Kyung Jung,Dongliang Wang,Axiang He,Lili Yang,Jung-Woog Shin,Jie Wei
Dental implanted materials require excellent mechanical properties, biocompatibility as well as integration with bone tissue and gingival tissue to achieve early loading and long-term stability. In this study, cubic shape sodium tantalite (ST) submicro-particles with the size of around 180 nm were synthesized by a hydrothermal method, and ST/polyetheretherketone (PEEK) composites (TPC) with ST content of 20 w% (TPC20) and 40 w% (TPC40) were prepared by melting blend. The results showed that the compressive strength, thermal properties, surface roughness, hydrophilicity and surface energy as well as adsorption of proteins on TPC40 were also significantly enhanced compared with TPC20 and PEEK. Moreover, the responses (adhesion and proliferation as well as differentiation) of rat bone marrow mesenchymal stem cells (rBMSCs), and responses (adhesion, and proliferation) of human gingival epithelial (HGE-1) cells to TPC40 were significantly promoted compared with TPC20 and PEEK. The results demonstrated that ST content in TPC had remarkable effects on the surface properties, which played key roles in stimulating the responses of both rBMSCs and HGE-1 cells. TPC40 with increased surface properties and excellent cytocompatibility might have great potential as an implanted material for dental application.
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TEXTILE RESEARCH JOURNAL
·
2019
·
IF 1.613
Xiang Yeping,Liu Liu,Zhang Ruiyun,Yu Jianyong,Fang Bin,Ji Feng,Jing Miaolei
Hemp fiber, as a kind of renewable textile fiber, has evoked much interest due to its excellent properties in various fields. It has been investigated in just one step to finish the process of chemo-enzymatic degumming and modification of hemp fiber, which is done in acetic acidsodium acetate buffer solution containing laccase (6.0 g), hemicellulase (0.3 g) and 2,2,6,6-tetramethylpiperidine-1-oxyl radical (0.3 g) under a mild condition (pH 5, 50C). The degumming effects of different batches of raw hemp fibers were also discussed. We found that the residual rate, fineness, length and tensile strength of degummed fiber were 15–27%, 9.00–24.00 dtex, 14.00–19.00 cm and 3.8–5.1 cN/dtex, respectively. Meanwhile, some of the oxidized functional groups were introduced into degummed fiber, which improved the moisture absorption and water retention value of the hemp fiber. The hemp fiber treated by this process could be further improved and then applied in the textile industry.
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JOURNAL OF CHEMICAL THERMODYNAMICS
·
2019
·
IF 2.29
Kun Fu,Pan Zhang,Dong Fu
The viscosities ( η ) of CO 2 -loaded 3-(dimethylamino)propan-1-ol (3DMA1P) aqueous solutions, CO 2 -unloaded and CO 2 -loaded 2-(ethylamino)ethanol (EAE)- 3DMA1P aqueous solutions were measured by using the NDJ-5S rotational viscometer . The temperature ranged from 303.2 K to 323.2 K. The mass fractions of 3DMA1P and EAE ranged from 0.3 to 0.5 and 0.01 to 0.03 respectively. The Weiland equation was used to model the viscosity and the calculated results agreed well with the experimental results. The effects of mass fractions of amines ( w ), temperature ( T ) and CO 2 loading ( α ) on viscosity were demonstrated on the basis of experiments and calculations.
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ANALYTICA CHIMICA ACTA
·
2019
·
IF 5.256
Guojun Cao,Can Wu,Yong Tang,Chidan Wan
Herein, graphite nanosheets (GN) were first prepared through simple liquid-phase exfoliation of graphite powder in N, N -dimethylacetamide (DMAC). After then, ultrasmall Cu-based metal organic frame (HKUST-1) nanoparticles (less than 5 nm) were in-situ anchored on the surface of graphite nanosheets with high degree of dispersion. Due to the intrinsic structural advantages of the as-synthesized HKUST-1 nanoparticles decorated graphite nanosheets (HKUST-1/GN) hybrids, including superior electron transfer ability and the greatly enhanced adsorption property, HKUST-1/GN shows excellent electrochemical sensing performance toward DNA damage biomarker 8-hydroxy-2’-deoxyguanosine with fast detection speed (∼240 s), wide linear window (10 nM–1 μM), high sensitivity (346857 μA mM −1 cm −2 ), low detection limit (∼2.5 nM), and good reproducibility. As a result, a highly sensitive electrochemical sensing platform for the detection of DNA damage biomarker 8-hydroxy-2’-deoxyguanosine was fabricated basing the as-prepared HKUST-1/GN hybrids. What is more, the developed electrochemical method was successfully used for the detection of real samples and exhibited satisfied result.
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CATALYSIS LETTERS
·
2019
·Vol. 149
·期 9
·2586-2596
·
IF 2.372
Shen Xiaohua,Wang Jingjing,Liu Miaoqing,Li Mengzhe,Lu Jianjun
Abstract A new route to synthesis hierarchical Ti-rich TS-1 with uniform intracrystalline mesopores, uniform crystal size and the higher Ti content has been developed by using the environmental-friendly and cheap surfactant Triton X-100 as the assisted template agent and (NH 4 ) 2 CO 3 as crystallization-mediating agent. In this way, the surface area and pore volume of the resulting materials can be adjusted by the Triton X-100 content. The catalytic properties of the Nano-size hierarchical Ti-rich TS-1 were investigated by hydroxylation of benzene to phenol with H 2 O 2 as oxidizing agent and deionized water as solvent. Due to the combination of hierarchical pores and high titanium content, the hierarchical Ti-rich TS-1 shows improved catalytic activity in the oxidation of benzene. Graphical Abstract
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ECS Journal of Solid State Science and Technology
·
2019
·Vol. 8
·期 5
·P3075
·
IF 1.795
Peng He,Bingbing Wu,Shuai Shao,Tong Teng,Peng Wang,Xin-Ping Qu
Cobalt has been applied as liners in current Cu interconnect and even as interconnect conductors in next-generation interconnect. In this work, effects of corrosion inhibitors 1, 2, 4-triazole (TAZ) on Co chemical corrosion, galvanic corrosion between Cu and Co, and Co polishing properties in the H2O2 based acidic slurry have been systematically investigated. Results show that 5 mM TAZ yields a low static etching and removal rate with a selectivity of about 1: 1 for Co to Cu, applicable for Co barrier/ Cu CMP, while 100 mM TAZ yields a high removal rate with same selectivity, applicable for Co via and trench CMP. It demonstrates that TAZ can effectively inhibit the galvanic corrosion between Co and Cu. Additionally, the adsorption behavior of TAZ on Co surface is both physisorption and chemisorption. In case of 5 mM TAZ, self-assembly TAZ molecules absorb on native Co oxide. In case of 100 mM TAZ, more soluble Co-TAZ complexes form, which reduces the stability of the passivation layer and results in pitting corrosion.
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TOXICOLOGY AND APPLIED PHARMACOLOGY
·
2019
·
IF 3.585
Wu Luo,Yiyi Jin,Gaojun Wu,Weiwei Zhu,Yuanyuan Qian,Yali Zhang,Jieli Li,Aisong Zhu,Guang Liang
Diabetic cardiomyopathy (DCM) is a common and severe complication of diabetes. A multitude of factors are involved in the pathogenesis of DCM including chronic inflammation and oxidative stress . We have recently shown that compound LF10 prevents inflammatory responses in an animal model of lung injury. In the present study, we explored the protective effects and mechanism of LF10 against DCM using a mouse model of streptozotocin-induced diabetes and high glucose (HG)-challenged cultured cardiomyocytes. We show that LF10 suppressed diabetes-induced cardiomyocyte hypertrophy and fibrosis , which was accompanied by preservation of cardiac function in mice. Mechanistically, LF10 prevented increases in the levels of pro-inflammatory molecules and oxidative stress under in vitro and in vivo diabetic conditions. Moreover, LF10 restored HG-downregulated sirtuin 1 (SIRT1) in cardiomyocytes and prevented HG-induced activation of MAPKs. Using specific small-molecule regulators, we found that SIRT1 was an upstream signal of MAPKs. In conclusion, LF10 inhibited ROS and MAPKs-mediated inflammation by restoring SIRT1, and prevented development of DCM. LF10 targeted both oxidative stress and inflammation, two tightly interconnected pathogenic pathways, which makes LF10 a highly advantageous therapeutic drug potential.
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DYES AND PIGMENTS
·
2019
·
IF 4.018
Yaoping Hu,Zhijin Gao
Here, we present a rapid and general fabrication methodology for fluorescent carbon dots (CDs) via injecting various oxygen-containing organic solvents including acetone , ethanol, ethyl acetate, tetrahydrofuran , and diethyl ether into hot concentrated sulfuric acid. All these small organic molecules are recognized as common, cheap, and abundant carbon precursors, which can convert into CDs just in 1 min through protonation , polymerization and aromatization. The as-prepared CDs with disordered amorphous cores and plentiful oxygenous groups show fascinating photoluminescence features, that can be used for sensitive and selective detection of hemoglobin (Hb) based on fluorescence quenching. The linear detection range is estimated to be 2–360 nM and the limit of detection is as low as 0.79 nM. After careful investigations, the inner filter effect is proposed to explain the sensing mechanism because the absorption band of Hb fully covers the emission spectrum of CDs and the fluorescence lifetime of CDs remains nearly constant after addition of Hb. The sensor is successfully applied for Hb detection in human blood samples, exhibiting a great potential for quantitative analysis of Hb in complex biological matrices.
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