JOURNAL OF SUPERCRITICAL FLUIDS
·
2022
·
IF 4.514
Jianqiao Yang,Shuzhong Wang,Jiahuan Wang,Jinlong Wang,Baoquan Zhang,Lu Liu,Wei Liu,Yanhui Li,Donghai Xu
In this study, the erosion-corrosion experiment of Ni based alloys in high-temperature and high-pressure supercritical water environment was performed. SiO 2 and Al 2 O 3 particles with the average diameter of 30 µm and 50 µm were used as erodent. The special designed specimens were fixed on a blade impeller , and the erosion tests were performed in a high pressure autoclave with a magnetic stirrer system. Results show that the basic corrosion mechanism is not changed by the erosion process. A Cr-rich inner oxide layer and a Fe/Ni rich outer oxide layer were formed on the alloy surface. However, the oxidation rates of the alloys were affected by the erosion process. Parts of the outer Fe and Ni oxides were removed by the erodent particles during the tests. The inner Cr oxide layer still exists owing to the self-healing ability of the Cr 2 O 3 layer, acting as a barrier to resist further corrosion of the alloys. The factors that affect the degree of erosion and the erosion-corrosion mechanism in SCW environment is analyzed.
研究领域:
材料科学
·
腐蚀科学
·
高温高压环境材料行为
·
表面工程
·
能源材料
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2019
·
IF 3.218
Xiaoxia Ren,Shou-Dong Xu,Shibin Liu,Liang Chen,Ding Zhang,Li Qiu
Biomass wastes or biomass derived hard carbon materials with the advantages of green, as well as economic and high reversible capacity have became the promising anode materials for sodium ion batteries (SIBs). Despite this, the poor rate capability hinders their further development. Here, we synthesized lath-shaped hard carbon materials derived from peanut shells by a two-step approach, namely a hydrothermal pretreatment for different treatment time first, and then a carbonized process at 800 °C. Morphology and structural characterizations (SEM, XRD and Raman) prove the hydrothermal pretreatment has a great influence on morphology transformation, the layer spacing, as well as the defect concentration which can enhance the adsorption sites of Na + and shorten the transport route of sodium ions . The PSDHCs-4 (hydrothermal treatment for 4 h) electrode can deliver the highest reversible capacity of 256 ± 5 mAh g −1 , and show the best capacity retention of 97 ± 2% at the current rate of 0.1 C after 100 cycles. More importantly, PSDHCs-4 electrode shows the excellent rate performances with a reversible capacity of 261, 244, 206, 163, 125, and 100 mAh g −1 at the current rates of 0.1, 0.2, 0.5, 1.0, 2.0 and 5.0 C, respectively. These remarkable electrochemical properties indicate that PSDHCs-4 material should be a promising anode material for SIBs.
研究领域:
材料科学
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电化学
·
能源存储
·
纳米材料
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可持续能源
·
碳材料
✓ 已验证
DOI
高影响因子
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
·
2017
·
IF 2.962
Ee Li,Jiajia Wu,Dun Zhang,Yan Sun,Juna Chen
D-phenylalanine (D-Phe) was tested for its effect on the corrosion of Q235 carbon steel caused by Desulfovibrio sp. which belongs to sulfate reducing bacteria (SRB). Weight loss results indicated that the corrosion rate of Q235 coupons exposed to D-Phe was reduced. Much less pits were found on the surface of these coupons. It was found that pH and dissolved oxygen content of bacteria cultures as well as the growth of bacteria were not affected by D-Phe. However, the cell shape of D . sp. was changed to a more filamentous or spherical shape by treatment with D-Phe, and the structure of biofilms formed by bacteria with transformed shapes was looser and thinner. Moreover, the hydrogen sulfide production of D . sp. was inhibited by D-Phe. These results suggest that D-Phe may inhibit the corrosion process through two ways, i, D-Phe alters the bacteria shape, which inhibits the formation of biofilm and changes the structure of it consequently; ii, D-Phe reduces the production of hydrogen sulfide .
研究领域:
微生物腐蚀
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材料科学
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环境微生物学
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金属腐蚀与防护
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生物膜研究
✓ 已验证
DOI
高影响因子
EUROPEAN JOURNAL OF PHARMACEUTICAL SCIENCES
·
2017
·
IF 3.756
Yu Huang,Jin-Mei Li,Zhi-Hui Lai,Jun Wu,Tong-Bu Lu,Jia-Mei Chen
Both cocrystal and nanocrystal technologies have been widely used in the pharmaceutical development for poorly soluble drugs. However, the synergistic effects due to the integration of these two technologies have not been well investigated. The aim of this study is to develop a nano-sized cocrystal of phenazopyridine (PAP) with phthalimide (PI) to enhance the release rate and oral bioavailability of PAP. A PAP–PI nano-cocrystal with particle diameter of 21.4 ± 0.1 nm was successfully prepared via a sonochemical approach and characterized by powder X-ray diffraction (PXRD), differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and dynamic light scattering (DLS) analysis. An in vitro release study revealed a significant release rate enhancement for PAP–PI nano-cocrystal as compared to PAP–PI cocrystal and PAP hydrochloride salt. Further, a comparative oral bioavailability study in rats indicated significant improvement in C max and oral bioavailability (AUC 0 − ∞ ) by 1.39- and 2.44-fold, respectively. This study demonstrated that this novel nano-cocrystal technology can be a new promising option to improve release rate and absorption of poorly soluble compounds in the pharmaceutical industry.
研究领域:
药剂学
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药物递送
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纳米医学
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药物代谢
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晶体工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2019
·
IF 4.561
Yanting Wang,Youmin Sun,Shengying Gong,Zhengqing Cai,Jie Fu
Silver nanoparticles (AgNPs) are one of the main nano-contaminants and their entry into the environment may pose a threat to the aquatic ecosystems . Meanwhile, AgNPs have an important impact on geological processes . In this paper, we studied the influence of AgNPs on the sedimentation of suspended sediments . Results showed the settling rate of sediments increased from 13.06 to 20.08 h −1 in the presence of 0.2 mg/L AgNPs. The morphology characterization indicated the average particle size of sediments increased from 34.74 to 42.87 μm after interacting with AgNPs, resulting in the acceleration of settlement on the basis of Stokes' law. The chemical analysis detected 43–57% of AgNPs were incorporated onto sediments, which was the dominant reason for the increased sediments size and settling rate. The influences of various water quality parameters, e.g., pH, ionic strength , temperature, humic acid and surfactant , on the sediments settlement and interaction with AgNPs were comprehensively studied. Elevating the solution pH, ionic strength, temperature, contents of humic acid and anionic/nonionic surfactants would suppress the settling of suspended sediments , whereas cationic surfactant showed a promoting effect on sediments settlement. In addition, the settling experiments were conducted in collected lake water and seawater , and results showed the real water matrices hindered the sediments settlement and interaction with AgNPs.
研究领域:
环境科学
·
地球化学
·
水体生态学
·
纳米毒理学
·
沉积学
✓ 已验证
DOI
高影响因子
Small
·
2021
·Vol. 18
·期 2
·2104440
·
IF 13.281
Jincai Yin,Wenxin Fan,Zihan Xu,Jinghua Duan,Yanzhi Xia,Zhihong Nie,Kunyan Sui
The intellectualization and complication of existing self-shaping materials are limited by the inseparable monotonic relationship between their deformation rate and deformation degree (i.e., a higher deformation rate is accompanied by a high deformation degree). This causes that they can only deform from 2D to 3D states. Here, a simple yet versatile strategy to decouple the monotonic correlation between the deformation rate and deformation degree of self-shaping hydrogels is presented for achieving complex deformations from 2D to temporary 3D to 3D (2D-to-4D). It is demonstrated that when the gradient hydrogels prepared by photopolymerization possess dense polymer networks, the local regions with a high deformation rate can exhibit a low deformation degree. The resulting hydrogels can thus deform in a novel 2D-to-4D mode under external stimuli. During the deformation, they first transform into the temporary shapes induced by the local deformation rate difference, and then transform into the final shapes determined by the local deformation degree difference. Through controlling the ultraviolet irradiation direction and time to precisely program the local gradients of self-shaping hydrogels, they can be designed to produce various unprecedented yet controllable 2D-to-4D shape evolutions on demand, such as transformable origami, sequential gesture actions in finger-guessing games, mobile octopuses, time switch, etc.
研究领域:
生物材料学
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高分子化学
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软体机器人
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组织工程
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智能材料
·
仿生学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2016
·Vol. 33
·期 3
·261-265
·
IF 2.267
Shuangbing Li,Jixiao Wang,Song Zhao,Wei Cai,Zhi Wang,Shichang Wang
The spherical silica particles in narrow size distribution with different diameters of 90 nm, 200 nm, 320 nm and 400 nm were prepared by the modified Stöber method and characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and dynamic light scattering (DLS). The phase composition of particles was characterized by X-ray diffraction. The results indicated that each of the silica particle samples was in amorphous state. The shear thickening fluids (STFs) comprising 53 vol.% of silica particles and 47 vol.% of polyethylene glycol with molecular weight of 200 g mol −1 (PEG200) were prepared and evaluated. The influence of size and size distribution on the critical shear rate and the intensity of shear thickening were analyzed. The STFs prepared by silica nanoparticles with a diameter of 90 nm showed the giant rheological effect with the critical shear rate of 2.51 s −1 , the largest viscosity of 45,500 Pa∙s and the yield stress of 181 kPa. The experiments and the analysis results demonstrated that the suspensions prepared by nanoparticles have high intensity of shear thickening.
研究领域:
胶体化学
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流变学
·
纳米材料科学
·
软物质物理
·
功能材料
✓ 已验证
DOI
高影响因子
DESALINATION
·
2020
·
IF 7.098
Binglin Bai,Xiaohong Yang,Rui Tian,XuanXuan Wang,Haibo Wang
Solar steam generation has become the most promising solar-thermal applications in recent years. Scientists often focus on the search for superior materials, efficient structures, while ignoring the use of residual heat from the water at the bottom. In this paper, a membrane distillation system that utilizes residual heat was added in a new solar house of a domestic hot water and drinking water supply system in the first place. The pDA-rGO-PTFE membrane as an excellent evaporator was characterized in solar steam generation system, which possesses good hydrophilicity capacity and high intrinsic absorption properties . And at the optimal concentration of 20 mg/mL, the evaporation rate and efficiency of pDA-rGO-PTFE membrane could reach up 1.45 kg·m −2 ·h −1 and 93.8% respectively in one sun (one sun = 1kw·m −2 ). The PTFE membrane as a separator was applied in a membrane distillation system. Under average 0.66 sun in the natural environment, the average evaporation rate of a new solar house could reach about 1.10 kg·m −2 ·h −1 , and there is an additional 0.71 kg·m −2 ·h −1 membrane permeation flux by the residual heat. In addition, the new solar house showed an excellent durability and desalination ability, the ions rejection rations of the collected condensate water were close to 99.8%. Hence, we conclude that further ideas of a new solar house were provided for solving water scarcity, domestic water consumption and the application of solar steam generation in the future.
研究领域:
能源科学
·
环境工程
·
材料科学
·
可持续技术
·
水处理技术
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·Vol. 50
·期 12
·21859-21868
·
IF 5.1
Haiyan Guo,Kuibao Zhang,Yuxiang Li
In this work, the irradiation response of A 2 Ti 2 O 7 (A represents rare earth elements of Gd, Dy, Ho, Er, Yb and Nd) series ceramics were systematically studied under 3 MeV Au 2+ ions. The structural changes pre- and post-irradiation were characterized using X-ray diffraction (XRD), grazing incidence X-ray diffraction (GIXRD) and Raman spectroscopy . After heavy ion irradiation , all the samples undergo structural transformations from ordered pyrochlore to disordered fluorite and then to amorphous phase. The sample surface became fully amorphous when exposed to the maximum irradiation dose. The 5RETO high-entropy pyrochlore exhibits the lowest rate of amorphization during the process of structural transformation. The cation radius ratio and mixed entropy are the primary factors influencing amorphization rate. The cation radius ratio shows a strong positive correlation with the amorphization rate, while the mixed entropy demonstrates a weak negative correlation with the amorphization rate. The cation radius ratio can thus serve as a reliable indicator for predicting the radiation resistance of high-entropy pyrochlore ceramics.
研究领域:
材料科学
·
核材料
·
固态化学
·
辐射效应
·
无机非金属材料
✓ 已验证
DOI
高影响因子
Russian Journal of Physical Chemistry A
·
2024
·Vol. 97
·期 14
·3227-3237
·
IF 0.7
Zheng Yayuan
This paper investigates the kinetics of sodium sulfate crystallization in a stirred bed crystallizer through experimental analysis, focusing on the homogeneous and heterogeneous nucleation mechanisms of the compound. Key nucleation parameters, including tension (γ), critical nucleation radius ( r* ), critical nucleation free energy (Δ G* ), and critical nucleation molecule number ( i* ), are measured under various temperatures and supersaturation ratios, utilizing classical nucleation theory. The results demonstrate that as temperature and supersaturation ratio increase, induction time, critical nucleation free energy, critical nucleation radius, and critical molecule number decrease, while nucleation rate increases. The crystal shape remains relatively constant with changes in temperature and supersaturation ratio, but the average particle size increases with higher supersaturation and temperature. The observed changes in nucleation parameters are consistent with classical nucleation theory. In addition, population balance equations are employed to fit kinetic equations for crystal nucleation and growth rates in a stirred crystallization system. The results show that the growth rate increases with higher supersaturation and stirring rates, while the influence of parameters in the nucleation rate equation suggests that suspension density has the greatest effect, followed by supersaturation ratio and stirring rate.
研究领域:
化学工程
·
材料科学
·
物理化学
·
过程工程
·
晶体工程
✓ 已验证
DOI
高影响因子
JOURNAL OF SUPERCRITICAL FLUIDS
·
2024
·
IF 3.4
Jianqiao Yang,Yining Ding,Fen Zhao,Shuzhong Wang,Yanhui Li,Donghai Xu
In this study, a Cr coating was fabricated on Ni-based alloys to prevent under-deposit corrosion. The effect of salt deposition on the structural integrity of the Cr coating in SCW environment with/without oxygen was investigated. Results show that the Cr coating kept its integrity after exposure in SCW environment, successfully avoided the metallic ions leaching from Ni-based alloys. The structure of the oxide layer after exposure is a thin Fe 2 O 3 or FeCr 2 O 4 layer and a Cr 2 O 3 layer. The oxidation rate of the Cr coating decreased to one third of the sample after exposure in the same environment without salt deposit layer, indicating that the inward mass-transfer of oxygen to the alloy surface was inhibited by the salt deposit layer. The volume expansion of the sample due to the growth of Cr oxide layer was restrained by the salt deposit layer, forming a growth stress in the coating.
研究领域:
材料科学
·
腐蚀科学
·
高温材料学
·
表面工程
·
能源材料
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Jing Lin,Zhanyi Cao,Lianshan Sun,Fei Liang,Limin Wang
Ti 1.4 V 0.6 Ni + x LiAlH 4 ( x = 0.5, 1, 1.5, 2, 2.5, wt.%) composites were prepared by ball-milling, and the effects of LiAlH 4 content on structure and electrochemical properties of the composites were investigated systematically. The addition of LiAlH 4 to the Ti 1.4 V 0.6 Ni alloy significantly affected the morphology and size of the composite particles . The electrochemical cycling stability and rate dischargeability of the composite electrodes benefitted from adding some LiAlH 4 ( x = 1), which however deteriorated when the LiAlH 4 content increased further. The positive effect of LiAlH 4 on the electrochemical performance of the studied alloy was caused by suppression of the dissolution of active components of the Ti 1.4 V 0.6 Ni hydrogen storage alloy.
研究领域:
材料科学
·
金属功能材料
·
能源存储
·
电化学
·
氢能技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）