APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Junfeng Gou,You Wang,Xuewei Li,Feifei Zhou
In this paper, effect of rare earth oxide nano-additives on the corrosion behavior of Fe-based hardfacing alloys was studied. The corrosive solutions were 3.5 wt.% NaCl + 0.01 mol/L HCl solution, 3.5 wt.% NaCl solution and 3.5 wt.% NaCl + 0.01 mol/L NaOH solution. The deep-etched microstructure of the hardfacing alloys was observed. The potentiodynamic polarization curves and electrochemical impedance spectra were used to study the corrosion behavior of the hardfacing alloys. The polarization test results showed that nano-additives shifted the corrosion potentials of the hardfacing alloys towards the noble direction in corrosive solutions. The values of the equivalent circuit elements for the impedance spectra of the hardfacing alloys indicated that nano-additives increased the corrosion resistance of the hardfacing alloys. When the content of nano-additives was 0.3 wt.%, the hardfacing alloy possessed the maximum charge transfer resistance in acid NaCl solution. The hardfacing alloy with 0.6 wt.% nano-additives had the maximum charge transfer resistance in near-neutral and alkaline NaCl solutions. The change in volume fraction of the primary and eutectic carbides and refinement of primary carbide influenced the corrosion behavior of the hardfacing alloys.
研究领域:
材料科学
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腐蚀工程
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产品关联
DOI
高影响因子
Journal of Functional Foods
·
2023
·
IF 5.6
Jichun Zhao,Zhengwei Tan,Ruyu Zhang,Weizhou Li,Fuhua Li,Jian Ming
This study investigated the alterations in the phytochemical components and the antioxidant abilities of brine- and NaCl-fermented carrots and their effects on the lipid metabolism and microbial community in high-fat diet (HFD)-fed mice. Results showed that brine-fermentation significantly improved the contents of total dietary fiber, total phenols and β-carotene by 57 %, 48 % and 117 %, respectively. Fermented carrots possessed a higher level of antioxidant activities ( P < 0.05). Furthermore, fermented carrot attenuated the increase in body weight, alleviated liver injury and oxidative stress but also promoted the lipid metabolism and reduced fatty acid accumulation in vivo , which were correlated with the total phenols and dietary fiber contents. Further investigation demonstrated that fermented carrots can attenuate HFD-induced lipid accumulation through the AMPK pathway and restoring the gut microbiota in HFD mice. Overall, fermented carrots can modulate the lipid accumulation in the HFD mice through the AMPK pathway and the microbiota community.
研究领域:
营养学
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微生物学
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代谢学
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DOI
高影响因子
Environmental Science-Nano
·
2020
·Vol. 7
·期 4
·1205-1213
·
IF 7.683
Dezhi Chen,Shoujun Wang,Zhiming Zhang,Hongying Quan,Yachao Wang,Yijie Jiang,Matthew J. Hurlock,Qiang Zhang
The efficient removal of endocrine-disrupting pollutants (EDCs) from water is a crucial issue for improving the quality of drinking water. Herein, hierarchically structured carbon composites (HCCs) composed of carbon-polyhedron decorated carbon nanosheets were fabricated using the zeolite imidazole framework-8 (ZIF-8) as the precursor in the presence of molten NaCl. The as-prepared hierarchical carbon composites showed higher specific surface areas, more defects, high N-doping, and hydrophilicity compared with the NaCl-free ZIF-8-derived carbon polyhedrons (CPs). In addition, the as-prepared HCCs exhibited boosted adsorption performances for the removal of the model EDC, namely carbamazepine (CBZ), surpassing CPs and commercial powdered activated carbon (AC). The adsorption kinetics showed that HCCs possessed a higher sorption rate as compared to CPs and AC. In the initial 5 min, the adsorption amount of CBZ on HCCs reached 94.9% of the adsorption quantity at equilibrium. Furthermore, the maximum adsorption capacity of CBZ on HCCs is 248.7 mg g−1, which is superior to that of CPs and AC. X-ray photoelectron spectroscopy characterizations indicated that the predominant factors for controlling the adsorption of CBZ on HCCs are π–π electron donor–acceptor interactions and hydrogen bonding, although, some of the adsorbed CBZ molecules were decomposed by oxidation. Finally, a fixed-bed experiment demonstrated that the HCCs have great potential as a filler for the purification of tap water.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Journal of Materials Chemistry A
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2017
·Vol. 5
·期 28
·14595-14603
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IF 8.867
Na Li,Xuankai Huang,Haiyan Zhang,Zhicong Shi,Yunyong Li,Chengxin Wang
Individual graphene ribbons, which fully exploit the large surface area of graphene sheets, have been fabricated. Constructing these unique structures into efficient macroscopic functional architectures is an important and challenging step towards practical applications. Here, we produce micro-structured interconnected ribbon-like graphene sheets (MRGs), which were induced by the multistage-recrystallization of NaCl templates in a microwave plasma chemical vapor deposition (MPECVD) system. The MRGs along different directions hang in polygonal graphene walls, which connect with each other forming a three dimensional (3D) transparent and self-supporting graphene film (MRG-GF). The MRG-GF with a large surface area, enhanced flexibility and fast ion/electron transport pathways exhibits improved capacitance (4.88 mF cm−2) and super-long cycle life with good cycling stability (capacitance retention was ∼95.5% after 20 000 cycles). Herein, we provide a novel approach for controlled synthesis of graphene ribbons, and graphene ribbon-based functional structures and composites.
研究领域:
材料科学
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纳米科技
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电化学
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能源存储
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功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2020
·
IF 2.369
Dandan Gao,Dongdong Li,Bin Hu,Wu Li
A temperature-dependent thermodynamic model was developed for representing the solid–aqueous equilibria in the quaternary NaCl + KCl + RbCl + H2O system based on the previous ones for binary and ternary systems. The solid–liquid equilibria in the quaternary system were first predicted by the developed model and then verified by conducting the experiments at T = 298.15 K by an isothermal equilibrium method with equilibration times of 5 and 160 days, respectively. The predicted univariant curve saturated with NaCl(cr) and (K,Rb)Cl(ss) in the system is in good agreement with our experimental data. Moreover, to verify the reliability of the model for the prediction of solid solution composition that coexisted with NaCl(cr), the XRD quantitative analysis technique based on the inverse Vegard approach is used. The experimentally determined solid solution compositions well support the results predicted by the model, indicating that the model can simultaneously predict the compositions of aqueous solution and solid solution that coexisted with a pure salt, i.e., NaCl(cr), in a system under an equilibrium state. Finally, phase diagrams of the quaternary NaCl + KCl + RbCl + H2O system at a temperature range of 273.15–373.15 K were predicted. These diagrams are useful for the future industrial applications.
研究领域:
物理化学
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热力学
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材料科学
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DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
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2016
·Vol. 20
·期 8
·2351-2362
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IF 2.327
Wei Yancong,Huo Yanqiang,Tian Guiying,Meng Qinghan,Cao Bing
Nitrogen-doped functional graphene nanocomposites (GO-MRF-x) for electrode materials in a capacitive deionization (CDI) application were conveniently prepared through a sol–gel polycondensation reaction catalyzed by Na 2 CO 3 under ambient pressure drying. The materials showed high surface functionalization (N and O groups) which were confirmed by X-ray photoelectron spectroscopy (XPS). The molar ratio of melamine with resorcinol had a marked effect on the specific surface area and porosity of the nanocomposites. The characterization results showed that with the specific surface area of 387 m 2 g −1 and N content of 7.26 wt%, laminated GO-MRF-0.8 material exhibited a good performance with high specific capacitance (222 F g −1 ), low charge-transfer resistance (0.10 Ω), and electrosorption capacity (16.72 mg g −1 ). Furthermore, the electrosorption isotherms were studied, and it was found that the ion electrosorption behavior of NaCl on GO-MRF-0 followed multilayer adsorption, whereas GO-MRF-0.8 exhibited a change from monolayer to multilayer.
研究领域:
材料科学
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环境工程
·
化学
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产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2023
·
IF 3.7
Xinbo Jing,Zhe Chen,Xue Cao,Qishen Huang,Pai Liu,Yun-hong Zhang
Sulfate formation is arguably the most important chemical process during urban haze events in China; however, the complex mechanism of sulfate formation from SO2 remains unresolved. Recent studies showed regionally transported sea spray aerosols (SSAs) and transition-metal ions (TMI)-catalyzed SO2 oxidation are major contributors to sulfate in haze events near coastal regions. To better understand the role of SSA and TMI catalysis, we investigated the reaction kinetics of Mn2+-catalyzed SO2 oxidation in NaCl microdroplets using confocal Raman spectroscopy coupled with a relative humidity (RH) and trace gas control system. We demonstrated that the reaction occurred on the droplet surface according to the linear correlation between the reaction rate and the droplet radius. The saturation concentration for both Mn2+ (0.001 mol/L at 1 ppm SO2) and SO2 (2 ppm at 10–5 mol/L Mn2+) implies the existence of an upper limit of the SO2 uptake coefficient, which is intercorrelated with Mn2+ and SO2 concentrations. The uptake coefficient increased with high ionic strength, while it remained constant when the pH ranged from 5 to 8. The uptake coefficient was on the order of 10–5 to 10–4, which is 10 to 100 times larger than that of the uncatalyzed autoxidation of SO2 and is overall higher than other mineral dust oxidation pathways.
研究领域:
大气化学
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环境科学
·
气溶胶科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Zhe Li,Qiao Zhu,Yafei Song,Zhenmin Cheng
The distinct Type I (e.g., NaCl, favoring liquid–vapor coexistence) and Type II (e.g., Na 2 SO 4 , prone to direct solidification) phase behaviors of salts in supercritical water (SCW) present fundamental challenges. This study combines experimental observations with multi-scale molecular dynamics (MD) simulations and theoretical analyses to provide a molecular-level rationale for this dichotomy. MD simulations reveal that in near-critical, high-density aqueous environments, NaCl (Type I) primarily forms dynamic, solvated ion pairs and smaller aggregates. These entities significantly perturb the solvent structure and lead to the formation of a concentrated fluid brine phase with a distinct interface. In contrast, Na 2 SO 4 (Type II) is characterized by the early formation of stable and compact clusters that minimally impact the bulk solvent and readily separate from the aqueous phase, consistent with direct precipitation. Density functional theory (DFT) calculations further reveal that reduced water density enhances electrostatic interactions, and a correlation between lattice energy and phase behavior was also identified. This work provides a comprehensive mechanistic understanding of Type I/II salt behavioral dichotomy, attributing it to the ions’ varying abilities to form either extensive self-aggregates or dynamic solvated clusters, governed by a balance of fundamental energetic and kinetic factors.
研究领域:
物理化学
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化学物理
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材料科学
·
计算化学
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DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2022
·
IF 3.119
Xiaohui Song,Jinqiu Ma,Lingzong Meng,Tianlong Deng,Yafei Guo,Yong Ma,Dan Li
The solubilities, refractive indices, and pH values in the NaCl–Na2SO4–NaHCO3–H2O system at 323.15 K were determined by the isothermal solubility method. The dry-salt diagram of the system consists of three isothermal solubility curves saturated with two salts, one invariant point, and three crystallization regions of NaCl, Na2SO4, and NaHCO3. Two models were applied to predict the solubilities in the system based on the Pitzer model. Model I assumes that there is only one carbon species HCO3– in the solution. Model II supposes that there are three carbon species corresponding to HCO3–, CO32–, CO2(aq), and OH– in the solution. Both the computed solubilities with the two models were basically consistent with experimental results. The concentrations of HCO3–, CO32–, CO2(aq), and OH– were calculated by model II. The dominant form of carbon species is HCO3–, and the concentrations of CO32– and CO2(aq) in the sodium bicarbonate solution can be neglected. Model II can be used to describe the experimental pH values. The mean activity coefficients of NaCl, Na2SO4, and NaHCO3, osmotic coefficients, and water activities were also calculated with the Pitzer model.
研究领域:
物理化学
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热力学
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溶液化学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Nan Li,Hongju Qiu,Lei Gao,Zhipeng Xie,Yunlong He,Yan Jiang,Guo Chen
Herein, to alleviate the hard agglomeration of ZrO 2 nanoparticles (NPs) fabricated by the traditional sol-gel method (SGM), a novel sol-gel-flux method (SGFM) is applied to tailor ZrO 2 nanoparticles (NPs) stabilized by 5 mol% Y 2 O 3 (5Y–ZrO 2 ) by in situ introduction of NaCl NPs among xerogel particles. The phase composition, micromorphology, surface area, and sintering performances of 5Y–ZrO 2 products fabricated by SGM and SGFM are compared. The effects of calcination temperature on the phase composition, micromorphology, and particle size of 5Y–ZrO 2 products prepared by SGFM are systematically investigated. The results show that the 5Y–ZrO 2 particles prepared by SGM are severely agglomerated and irregular, while the 5Y–ZrO 2 NPs prepared by SGFM are well dispersed, uniformly distributed, and quasispherical. The former can hardly be densified by sintering, while the latter shows excellent sintering performance. By sintering 5Y–ZrO 2 NPs prepared by SGFM at 1200 °C for 3 h, 5Y-TZP with a high density and an average grain size of 0.29 μm is fabricated. The in situ generated NaCl particles effectively separate ZrO 2 particles during sintering. The calcination temperature plays a crucial role in controlling the phase composition, agglomeration degree, micromorphology, particle size distribution , and particle size of 5Y–ZrO 2 products synthesized by SGFM, and the optimal calcination temperature is suggested to be 790 °C.
研究领域:
材料科学
·
纳米技术
·
陶瓷
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2020
·
IF 2.369
Liuying Ye,Dongdong Li,Ya-Ping Dong,Baoming Xu,Dewen Zeng
The specific heat capacity of NaBO2(aq) solution was determined using a Calvet-type calorimeter at a temperature from 288.15 to 338.15 K and at a concentration from about 0.25 mol·kg–1 H2O to near room temperature solubility limit. Combining these specific heat capacity data and thermodynamic and solid–liquid equilibrium data reported in the literature, a temperature-dependent thermodynamic model was developed for the NaBO2 + H2O system based on Pitzer–Simonson–Clegg activity coefficient equations. The model represents all of the properties over a wide temperature and concentration ranges. Combining the binary models of NaCl + H2O and Na2SO4 + H2O systems published in the previous studies of our group, multitemperature thermodynamic models of the NaBO2 + NaCl + H2O and NaBO2 + Na2SO4 + H2O systems were constructed. These ternary models reproduce the experimental solubility isotherms reported in the literature in general, but some significant inconsistency is still present. More accurate solubility data for these ternary systems at various temperatures are urgent.
研究领域:
物理化学
·
热力学
·
溶液化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Xuhong Jiang,Mengmeng Sun,Zhuoyuan Chen,Jiangping Jing,Guiying Lu,Chang Feng
Boosting the photoinduced cathodic protection (CP) for metals in NaCl solution is crucial for achieving the application of photoelectrochemical conversion in marine corrosion protection. An environmentally friendly three-dimensional ZnIn 2 S 4 /TiO 2 nanoflowerbush (NFB) photoelectrode was constructed with sufficient interfacial incorporation based on the ultrafine branched TiO 2 nanobush substrate via a facile in situ hydrothermal method . This ZnIn 2 S 4 /TiO 2 NFB nanoheterojunction composite behaves excellent photoinduced CP performance for metallic materials. This is owing to the optimized construction of photoelectrode with relatively negative band potential, wide solar spectrum response, effective generation and collection of photoinduced electrons. The morphology, distribution and performance of ZnIn 2 S 4 vary with different substrates. The pure ZnIn 2 S 4 powder is nanoflower sphere composed of a lot of thin petals; when ZnIn 2 S 4 grow onto the FTO glass, the ZnIn 2 S 4 petals are distributed vertically on the two-dimensional structure; when ZnIn 2 S 4 grow on the three-dimensional ultrafine branched TiO 2 nanobush substrate, a ZnIn 2 S 4 /TiO 2 NFB architecture with ultrafine TiO 2 branchlet cores are formed. This ZnIn 2 S 4 /TiO 2 NFB photoelectrode can achieve efficient photoinduced CP performance for pure copper and low alloy steels with different negative self-corrosion potentials, such as Cu (−0.18 V), E40 (−0.45 V), Q345 (−0.55 V) and Q235 carbon steel (−0.65 V) under simulated sunlight irradiation in NaCl solution without additional hole scavengers, and the photoinduced CP current densities reach as high as 170, 72, 63 and 44 μA cm −2 , respectively. The high-efficiency photoinduced CP performance is closely related to the band structure gradient matching between the TiO 2 and ZnIn 2 S 4 , prompting both the widened absorption of solar spectrum and high-efficiency transfer of the photogenerated electron–hole pairs. Importantly, the negative band potential of ZnIn 2 S 4 endues a lower surface work function which benefits the electron transport to the under-protected metallic materials to achieve photoinduced CP. This photoelectrode exhibits huge photoinduced CP application potential in marine environments.
研究领域:
材料科学
·
电化学
·
腐蚀科学
·
光电化学
·
海洋工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）