JOURNAL OF CHEMICAL THERMODYNAMICS
·
2021
·
IF 3.178
Lan Yang,Xiuxiu Yang,Dan Li,Liwei Zhuang,Lingzong Meng,Tianlong Deng,Yafei Guo
The solubilities and refractive indices in the systems Na 2 SO 4 –NaBO 2 –H 2 O and NaCl–Na 2 SO 4 –NaBO 2 –H 2 O at 323.15 K were studied by the isothermal dissolution method. The phase diagram of the ternary system is composed of two single-salt crystallizations for Na 2 SO 4 and NaBO 2 ·4H 2 O. A comparison of the diagrams of system Na 2 SO 4 –NaBO 2 –H 2 O from 288.15 K to 323.15 K shows that the crystallization region of NaBO 2 ·4H 2 O changes greatly as the temperature increasing, and the solid phase of mirabilite at 288.15 K and 298.15 K transforms into the nardite at 308.15 K and 323.15 K. The dry-salt diagram of the quaternary system consists of four salt crystallization fields for NaCl , NaBO 2 ·4H 2 O, NaCl·NaBO 2 ·2H 2 O and Na 2 SO 4 , five univariant solubility curves and two invariant points. On the basis of the Pitzer model, the lacking Pitzer parameters and dissolution equilibrium constants of the solid phases in this quaternary system were fitted with the solubilities and other thermodynamic properties in this study and literature. The calculated solubilities in the two systems are in good agreement with the experimental data.
研究领域:
物理化学
·
热力学
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产品关联
DOI
高影响因子
DESALINATION
·
2023
·
IF 9.9
Yongheng Yin,Yuemin Guang,Hongxiu Zhang,Qiying Xia,Chongbin Wang
The trade-off limit between permeability and selectivity , along with membrane fouling , has consistently posed significant challenges impeding the practical implementation of water purification membranes. In this paper, a combination of polyhedral oligomeric silsesquioxanes (POSS) and chitosan is introduced into the polyamide layer through interfacial polymerization and crosslinking to optimize the physical, chemical structure of membrane simultaneously. The resulting P/CS-2-POSS-2 membrane exhibits a notable water flux of 221.3 L m −2 h −1 MPa −1 and a substantial Na 2 SO 4 rejection of 97.1 %. The selectivity of water molecules over sulfates in the optimized hybrid membrane is approximately 4 times greater than that observed in the pristine polyamide membrane. This finding underscores the success of the developed method in mitigating the trade-off between permeability and selectivity. Furthermore, the hybrid membranes exhibit superior antifouling properties, as evidenced by an impressive flux recovery ratio of 95.8 % for bovine serum albumin. Additionally, the mass transport properties of the prepared membranes are explored via molecular dynamics (MD) simulations. The results highlight that chitosan primarily enhances the membrane's hydrophilicity , whereas POSS predominantly regulates the membrane's pore size. Both fillers synergistically enhance the comprehensive performance of the membrane by effectively utilizing steric hindrance and the Donnan effect .
研究领域:
材料科学
·
环境工程
·
水处理
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产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2025
·
IF 6.1
Xiaopeng Hu,Sai Liu,Qing Liu,Yang Su,Junyao Wu,Zhihang Xie,Jinwei Guo,Wang Zhu
The service life of thermal barrier coatings (TBCs) in calcium magnesium aluminosilicate (CMAS) and molten salt environments has become a key factor in determining engine reliability and safety. The effect of interface roughness (bond coating surface roughness) on the CM (CMAS + molten salt (Na 2 SO 4 + NaCl + NaVO 3 )) corrosion resistance of electron beam physical vapor deposition (EB-PVD) TBCs is investigated. The addition of molten salts lowers the melting point of CM, leading to more severe destructive effects compared to single CMAS corrosion. Moreover, the 1200# specimen (Ra = 2.0 μm) exhibits the best resistance to CM corrosion. The adjustment of interface roughness significantly alters the microstructure of the top-ceramic coating and induces changes in crack patterns after CM corrosion. Therefore, appropriately reducing interface roughness is key to improving the isothermal CM corrosion resistance and high-temperature CM corrosion-induced thermal shock performance of TBCs.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
Functional Materials Letters
·
2023
·
IF 1.3
Zengbao Sun,Xin Liu,Shengnian Tie,Changan Wang
In this paper, carbon particles with micro- and nano-particle size were synthesized through a hydrothermal reaction of glucose, namely C-1(123.1 nm), C-2(229.2 nm), C-3(335.1 nm), C-4(456.2 nm) and C-5(534.0 nm) with distinct sizes. We utilized five size carbon particles as individual fillers into the EHS matrix materials to prepare composite eutectic phase change materials (C/EHS PCMs) by melt blending technique. The impact of carbon particle size on the dispersion stability and thermal properties of Na 2 SO 4 ⋅10H 2 O–Na 2 HPO 4 ⋅12H 2 O (EHS) phase change materials was investigated. Scanning electron microscopy (SEM) and dynamic light scattering (DLS) analysis were done to analyze the diameters of carbon particles. The cryogenic-scanning electron microscopy (Cryo-SEM) analysis indicated that the carbon particles resulted in modification in the morphology of the EHS. The results of in situ X-ray diffraction (XRD) and Fourier-transformed infrared (FTIR) analysis showed only simple physical mixing between carbon particles and EHS. It is shown that adding 0.2 wt.% C-2 can decrease the supercooling degree of EHS to 1.5 ∘ C. The cyclic stability of C/EHS varies significantly depending on the size of carbon particles. The thermal conductivity of EHS increased by 42.1%, 39.9%, 14.4%, 19.5%, and 18.8% with the addition of C-1, C-2, C-3, C-4, and C-5, respectively, at a mass fraction of 0.2%. The results of differential scanning calorimetry reveal that the incorporation of C-1, C-2, C-3, and C-4 into EHS leads to an enhancement of latent heat. The latent heat capacity of EHS with 0.2 wt.% C-2 is 243.4 J⋅g − 1 , and after undergoing 500 cycles of solid-liquid phase transition, the latent heat remained above 200 J⋅g − 1 . Through the comprehensive analysis, the C-2/EHS composite phase change material holds significant potential for advancing building insulation and solar energy storage technologies.
✓ 已验证
DOI
高影响因子
SN Applied Sciences
·
2019
·Vol. 1
·期 7
·710
·
IF 0
Liu Xin,Tie Jian,Zhang Jiqing,Jiang Siyuan,Tie Shengnian
The Na 2 SO 4 ·10H 2 O-based phase change energy storage materials (PCMs) were fabricated through vacuum impregnating and adsorbing the oxidized multi-walled carbon nanotubes (MWCNs) with diatomite. The Fourier Transform Infrared Spectroscopy results reveals that the existence of carboxyl and hydroxyl groups in MWCNs can increase its compatibility with PCMs. The vacuum impregnated to obtain the diatomite composite PCMs (PCMs-M-D) crystallize adhering to the treated diatomite (DI-2) observed from the scanning electron microscope. The PCMs-M-D displays negligible supercooling and the thermal conductivity reaches 0.97 W m −1 K −1 . Moreover, after 100 cycles of phase change, the melting latent heat loss is 1.43% and the solidification latent heat loss is 11.15%, showing good heat storage performance and chemical stability.
研究领域:
材料科学
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储能技术
·
纳米复合材料
·
热能存储
✓ 已验证
DOI
SOLAR ENERGY
·
2024
·
IF 6
Tong Jiang,Jun Hu,Shiliang Wu,Dekui Shen,Ping Lu
Using coal fly ash (CFA) as the skeleton material and binary sulfates of Na 2 SO 4 -K 2 SO 4 as the phase change material (PCM), high-temperature coal fly ash based phase change thermal storage materials (CPCM) were successfully synthesized. The influences of CFA fractions and types on the morphology, physicochemical properties, and thermal characteristics of the composites were intensively investigated. Results show that the heat storage density and thermal conductivity of CPCMs increase with the PCM content. Particularly, the CPCM60-A composite, comprising 60 wt% Na 2 SO 4 -K 2 SO 4 eutectic and 40 wt% CFA-A, exhibits excellent chemical compatibility and stable shape retention after sintering. Furthermore, CPCM60-A demonstrates the highest phase change latent heat of 60.43 J/g and thermal conductivity of 0.61 W/(m·K). The influence of CFA types reveals that CFA-A with a higher ratio of SiO 2 and Al 2 O 3 , lower carbon content, and a rich porous structure is more suitable to fabricate molten salt heat storage materials. This work demonstrates that CFA, a byproduct of coal-fired industry, is a promising skeleton material for the fabrication of high-temperature CPCM composites, offering a novel approach for enhancing the efficiency and cost-competitiveness of solar power and waste heat recovery systems.
研究领域:
材料科学
·
储能技术
·
可持续材料
·
热工工程
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Qian Wang,Xin Wei,Guang-Rui Wang,Tian-Dan Lu,Qixun Shi,Shi-Peng Sun
This study aims to develop an inner selective coordination nanofiltration hollow fiber (CNHF) membrane for the efficient removal of antibiotics from groundwater. In the first step, a modified substrate with the controlled modification degree is achieved by pressure-assisted alkali modification of polyimide hollow fiber substrate to provide the active points for the construction of the dense active layer. Then, the high-performance active layer is dynamically built on the modified substrate by the coordination between Fe 3+ and phytic acid. Compared to static synthesis, the pure water permeability (PWP) of the membrane is improved from 4.1 to 8.5 Lm −2 h −1 bar −1 and Na 2 SO 4 rejection enhanced from 68.3% to 97.0% by the dynamic synthesis with a cross-flow system. The newly developed membranes exhibit high rejection to several pharmaceuticals (>99%). This work may provide insightful guidelines for improving the fabrication procedures and scaling up the inner-selective CNHF membrane modules for water purification and other applications.
研究领域:
环境工程
·
膜科学
·
水处理
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Qiu-Yu Zhu,Liu-Kun Wu,Lan-Qian Li,Li-Wei Zhuang,Shuang-Mei Xue,Zhen-Liang Xu,Yong-Jian Tang
The monomer concentration is a key factor affecting the diffusion rate and reaction rate of the monomers and determines the physicochemical property of polyamide nanofiltration membranes. However, the mechanism of the monomer concentration effect on the polyamide nanofiltration membrane remains unclear. The properties of nascent membranes fabricated with different monomer concentrations with a fixed ratio presented completely new results in the absence of heat treatment. The results reveal that the polyamide layer thickness increases linearly with the monomer concentration when the concentration is high. The nanofiltration membranes prepared at a low concentration have a larger pore size and a lower cross-linking degree, which contributed to high water permeability. The optimal membrane presented a high pure water permeability of 36.1 L h–1 m–2 bar–1, with the Na2SO4 rejection maintained at 98.4%. This work provides a novel insight into the relationship between the properties of the nanofiltration membrane and monomer concentration.
研究领域:
材料科学
·
化学工程
·
膜技术
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产品关联
DOI
高影响因子
DESALINATION
·
2022
·
IF 11.211
Cunxian Lai,Xuewu Zhu,Jinyu Li,Weiwei Zhou,Jingtao Xu,Junwen Ding,Jialin Song,Daoji Wu,Heng Liang,Xiaoxiang Cheng
Highly permeable nanofiltration (NF) membranes with efficient natural organic matter (NOM) removal yet preserving essential minerals are of great significance for purifying ground water. In this work, a novel pH-regulated interfacial polymerization (PRIP) strategy was proposed to fabricate ultra-low pressure NF membranes. This strategy was achieved by changing the aqueous solution pH (5, 7, 9, and 11) during IP process. The effects of pH-regulated processes on the structure, chargeability, and physicochemical properties of NF membranes were systematically investigated. Tailored NF membranes under acidic conditions (TFC-pH 5) achieved the ultrahigh permeability of 42.9 L m −2 h −1 bar −1 and 83.3 % moderate rejection of Na 2 SO 4 . For the NF membranes prepared under alkaline conditions (TFC-pH 11), the sieving capacity was obviously improved with fewer defects, and 99.4 % rejection of Na 2 SO 4 was observed. In addition, the purification performance of NF membranes in ground water treatment was further studied. Modified NF membranes showed significant removal of NOM and retain moderate amounts of mineral salts. Finally, the mechanism of the pH-regulated influence on the polyamide active layer formation process was proposed. This study provides a feasible and facile design idea for ultralow-pressure NF membranes in purifying ground water.
研究领域:
环境科学
·
材料科学
·
水处理
✓ 已验证
产品关联
DOI
高影响因子
CORROSION SCIENCE
·
2020
·
IF 6.479
Lian-Kui Wu,Jing-Jia Wu,Wei-Yao Wu,Hao-Jie Yan,Mei-Yan Jiang,Fa-He Cao
To improve the hot corrosion resistance, thickness controllable SiO 2 coating was electrodeposited on TiAl alloy. The hot corrosion behavior of the specimens contaminated with 75 wt.% Na 2 SO 4 + 25 wt.% NaCl salt mixture was investigated at 700 °C. Results showed that the generation of compact amorphous SiO 2 embedded with Na 2 Si 4 O 9 and cristobalite was responsible for the enhanced hot corrosion resistance. Moreover, the SiO 2 coating does not only act as a diffusion barrier to sulfur and chlorine but also decreases the oxygen partial pressure at the coating/alloy interface, therefore promoting the selective oxidation of Al to form protective Al 2 O 3 layer.
研究领域:
材料科学
·
腐蚀工程
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
·
2026
·
IF 4.5
Yaowei He,Jiabin Lu,Huilong Li,Chenyu Liu,Jinlong Huang,Wenrui Liang
Proposes a novel machining method based on the PC-FAPD. • PC-FAPD combines the advantages of fixed and free abrasives. • Reveals the material removal mechanism of PC-FAPD. To simultaneously enhance the surface polishing quality of workpieces and reduce processing costs, this study proposes a fabrication method for Pore-Confined Free Abrasive Polishing Disc (PC-FAPD) using water-soluble shell Diamond@Na 2 SO 4 core-shell abrasives. During polishing, the Na 2 SO 4 shell dissolves to form pore-confined free abrasives, which act in a three-body friction mode under pore constraints to enable high-efficiency, high-quality polishing while ensuring high abrasive utilization. Diamond@Na 2 SO 4 core-shell abrasives were synthesized via evaporative crystallization, and the influence of different Diamond/Na 2 SO 4 mass ratios on coating thickness was systematically investigated, followed by an evaluation of the polishing performance of PC-FAPD with core-shell abrasives of varying coating thicknesses. Results show that as the Diamond/Na 2 SO 4 mass ratio decreases, the Na 2 SO 4 coating becomes thicker and denser; at a 1:3 mass ratio, the C atomic percentage in the abrasives drops from 92.690% to 12.628%, the particle size increases from 4.3 μm to 6.3 μm, and the diamond coating thickness reaches 1 μm. Polishing tests on single-crystal SiC indicate that the uncoated abrasive disc achieves the highest material removal rate (MRR) of 2968.06 nm/h, while the 1 μm-thick coating disc yields the lowest surface roughness (Sa = 1.31 nm). As the coating thickness of the core-shell abrasives increases, the material removal mode of the abrasives on the workpiece becomes closer to that of free abrasives. This reduces the MRR to a certain extent but enables better surface quality, with the performance of repeated polishing remaining relatively stable. Friction and wear experiments confirm that thicker coatings transition the removal mode from two-body plowing to three-body rolling and scratching. This research provides a novel strategy for ultra-precision machining.
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产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Yufen Yan,Yayu Guo,Huadong Zheng,Liang Qi,Yutao Yang,Yanli Miao,Xixi Shi,Lianqi Zhang,Chunliang Li,Dawei Song
Development of sulfide solid-state electrolytes (SSEs) with high ionic conductivity plays a leading role in achieving all-solid-state sodium batteries (ASSSBs). As an important raw material for synthesizing sulfide SSEs, the purity of Na 2 S significantly affects the ionic conductivity and electrochemical properties of sulfide SSEs. In order to obtain high-purity and low-cost Na 2 S, a hydrogen reduction of industrial grade Na 2 SO 4 followed by ethanol purification has been successfully employed to synthesize and purify Na 2 S, which possesses a high purity of 98 %. Na 3 SbS 4 has been synthesized by as-synthesized Na 2 S (A-Na 2 S) and commercial Na 2 S (C–Na 2 S) by liquid-phase synthesis and solid-state reaction methods, respectively. The electrochemical properties indicate that Na 3 SbS 4 samples synthesized by A-Na 2 S possess higher ionic conductivity and lower Ea, and the assembled ASSSBs exhibit higher specific capacities, superior cycle and rate performance. At 0.5C, the assembled TiS 2 /Na 3 SbS 4 /NaSn ASSSB exhibits a high initial capacity of 211.4 mAh g −1 with capacity retention of 96.2 % after 360 cycles at room temperature. This work provides a simple approach for synthesizing high-purity Na 2 S at low cost, enabling the large-scale application of sulfide SSEs for ASSSBs.
研究领域:
材料科学
·
电化学
·
固态离子学
·
能源存储
·
无机合成
·
电池技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）