JOURNAL OF CHEMICAL THERMODYNAMICS
·
2023
·
IF 2.6
Xiaomeng Liu,Mengying Chen,Guoyuan Xiong,Yafei Guo,Lingzong Meng,Tianlong Deng
The phase equilibria of the ternary system at 298.15 and 338.15 K were investigated by the isothermal dissolution equilibrium and wet-reside solid phase (Schreinemarkers rule) methods. The solubilities and the physicochemical properties containing density and refractive index were obtained experimentally. Then, the phase diagrams and the diagrams of physicochemical properties against the composition in the ternary system at two temperatures were proposed. The phase diagrams of this system at two temperatures contain two invariant points, three solubility curves, and three crystallized regions corresponding to NaNO 3 , RbNO 3 and double salt NaRb 2 (NO 3 ) 3 . According to the phase diagrams at 298.15 and 338.15 K, a novel separation process of RbNO 3 from the mixture solution of NaNO 3 was established for the first time, and the separation rate of RbNO 3 in the mixed solution reached 43.75% in a single yield. This work provides an efficient and reliable RbNO 3 green recovery method from the eluent solution of NaNO 3 efficiently.
研究领域:
化学
·
材料科学
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DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2015
·Vol. 15
·期 12
·9656-9664
·
IF 1.556
Wang Chuanying,Cheng Xianhua
Yb3+ and Er3+ ions co-doped α-NaYF4:Yb3+, Er3+ nanocrystals were successfully synthesized via a facile hydrothermal method using citric acid (CA) as chelating ligand and NaNO3 as mineralizer. The influences
of the CA/RE (RE= Y+Yb+Er) molar ratio, reaction time, reaction temperature and the NaNO3/RE molar ratio on the crystal phases and shapes of as-prepared products have been well investigated. The possible formation mechanism has been discussed in detail and an aggregation growth
theory has been proposed. X-ray diffraction (XRD), transmission electron microscopy (TEM), selected area electron diffraction (SAED), scanning electron microscopy (SEM), and photoluminescence (PL) spectra were used to characterize the products. Under 980 nm excitation, the emission intensities
of the as-prepared nanocrystals were much stronger than that of the nanocrystals modified by ethylenediaminetetraacetic acid (EDTA). Additionally, the as-prepared products maintained spherical shape and high degree of monodispersion, which is expected to be suggestive for the preparation of
other complex rare earth fluoride compounds.
研究领域:
材料科学
·
光学
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DOI
PubMed
高影响因子
Journal of Chemistry
·
2022
·
IF 3.241
Yanqin Meng,Libin Yang,Qing Xu,Yafei Guo,Tianlong Deng
Ion-selective electrodes directly respond to the activity of target ions without destroying the existing form of the original electrolyte, so ion-selective electrodes have been widely used in various fields. Mean activity coefficient of NaNO3 in the ternary system (NaNO3 + CsNO3 + H2O) at 298.15 K was measured by electromotive force (EMF) with the cell: Na+ ion-selective electrode (Na-ISE)|NaNO3 (mA), CsNO3 (mB)|NO3- ion-selective electrode (NO3-ISE) with total ionic strengths from 0.01 to 4.5 mol·kg-1 at different ionic strength fractions (0, 0.1, 0.2, 0.4, 0.6, and 0.8). The results showed that the Na-ISE and NO3-ISE have a good Nernst response, and the mean activity coefficients of NaNO3 are obtained via the Nernst equation. Based on the data of mean activity coefficients of NaNO3, the relationship diagrams of activity coefficients of NaNO3 against ion strengths in the ternary system were demonstrated, and the Pitzer mixing ion-interaction parameters and were obtained.
研究领域:
化学
·
物理化学
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DOI
高影响因子
Journal of Science-Advanced Materials and Devices
·
2025
·
IF 6.8
Baiyuan Tian,Chuang Zhu,Manting Gu,Minhao Xu,Wenxuan He
This study aims to discover innovative thermal storage materials that fulfill the specifications of concentrated solar power systems. Thermal storage materials based on ternary eutectic (Hitec) with nano-SiO 2 and nano-MgO are investigated. Simultaneous thermal analysis and laser flash analysis are used to study the main properties of materials. The results indicate that the inclusion of nano-SiO 2 and nano-MgO reduces the melting point while enhancing the latent heat of the base salt. Doping the base salt with 0.3 wt.% nano-SiO 2 and 0.7 wt.% nano-MgO results in molten salt nanocomposites with an average specific heat of 2.16 J/(g⋅K), which is 54.3% higher than that of the base salt. This surpasses the specific heat of the base salt mixed with a single type of nanoparticle. The thermal conductivity of this nanocomposite is increased by 13.13% to 0.836 W/(m⋅K) compared to the base salt. Furthermore, this study demonstrated that the effect of interfacial thermal resistance on specific heat capacity and heat transfer characteristic is opposite. While the nanoparticles can increase the specific heat capacity of the molten salt, they can also reduce the heat transfer rate within this material.
研究领域:
材料科学
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能源工程
·
纳米技术
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DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Ting Qu,Jinpeng Zhang,Jinbo Song,Jieying Jing,Wen-Ying Li
The magnesium oxide (MgO) sorbents doped with different NaNO 3 /NaNO 2 molar ratios were prepared to improve their stability over multiple cycles. Regulating the NaNO 3 /NaNO 2 molar ratio effectively improved the CO 2 adsorption performance of the sorbent. The MgO sorbent with the NaNO 3 /NaNO 2 molar ratio of 0.8 exhibited outstanding performance and stability. Characterization and density functional theory calculations confirmed the positive effects of the appropriate NaNO 3 amount in improving the adsorption activity, whereas the suitable NaNO 2 amount slowed the sintering step and improved stability. Notably, the molten salt remained stable during cycling and did not decompose even at high regeneration temperatures, guaranteeing the cyclic stability of the sorbent. Further characterization showed that the CO 2 sorption drop in the first few cycles was ascribed to the decline in the active surface owing to the aggregation of MgO particles, incomplete regeneration of sorbents, and segregation of molten salt on the sorbent surface.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2015
·
IF 2.037
Chunli Liu,Li Zhou,Liqun Fan,Chonggui Ren
Enthalpies of solution and densities of glycylglycine in aqueous solutions of NaNO3, NaClO4, and Na2SO4 were measured at 298.15 K. Standard transfer enthalpies (ΔtrH0), standard transfer partial molar volume (ΔtrVϕ0), and hydration numbers (Nh) have been determined for glycylglycine. All of the ΔtrH0 values are negative in the three salt solutions. The relative order of ΔtrH0 in the same concentration of 1–1 type salts is NaNO3 > NaClO4. The ΔtrH0 in low concentration of Na2SO4 solutions is between the corresponding values in NaNO3 and NaClO4 solutions. With increasing Na2SO4 concentration, the ΔtrH0 values exceed that in NaNO3 solutions. The ΔtrVϕ0 values are positive and vary in the sequence Na2SO4 > NaNO3 > NaClO4. The results were discussed in terms of various interactions.
研究领域:
生物化学
·
物理化学
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产品关联
DOI
高影响因子
Nanomaterials
·
2025
·Vol. 15
·期 24
·1854
·
IF 4.3
Manting Gu,Dan Zhang,Chuang Zhu,Panfeng Li,Wenxin Han
Molten salt, as a phase change heat storage material, can be used to mitigate the volatility of clean energy. Increasing the specific heat of molten salts can help to increase heat storage density and reduce costs. In this study, nanoparticles with different potentials were prepared and doped into Solar Salt (NaNO3-KNO3). The modification results of the nanoparticles were evaluated by transmission electron microscopy, energy dispersive X-ray spectroscopy and infrared spectroscopy, and the modification process was analyzed by density functional theory. The specific heat, thermal diffusion coefficient, melting point, latent heat of the composites and their variation mechanism were analyzed using synchronized thermal analyzer, laser flash analyzer and scanning electron microscope. It was found that acidification was able to modify the SiO2nanoparticles and that the higher the acidity, the more the negative charge of the nanoparticles was neutralised. A 25.8% decrease in zeta potential to −23.17 mV was observed for the nano-SiO2after treatment with HCl at pH 1, compared to the non-acidified sample. The microelectric field generated by the charged nanoparticles affects the thermophysical properties such as the specific heat of the molten salt-nanoparticle composites, with one of the samples having the largest specific heat (1.79 J/(g·K)) and thermal diffusion coefficient (0.94 mm2/s), which were increased by 13.3% and 14.6%, respectively, compared to the Solar Salt. This study attributes the alterations in thermophysical properties to the variation in ion separation distance induced by the charge on nanoparticles.
研究领域:
材料科学
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储能技术
·
热物理学
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纳米复合材料
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可再生能源
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产品关联
DOI
PubMed
高影响因子
Materials
·
2024
·Vol. 17
·期 18
·4611
·
IF 3.1
Chuang Zhu,Minhao Xu,Baiyuan Tian,Manting Gu,Li Gong
The aim of this study is to further enhance the thermal storage and heat transfer performances of a low-melting-point quinary salt. The eutectic salt was prepared using LiNO3, NaNO3, KNO3, NaNO2, and KNO2as raw materials, followed by the doping of nano-SiO2and nano-MgO into the base salt using a microwave-assisted method. The thermal properties of the samples were analyzed using a Synchronous Thermal Analyzer and a Laser Flash Apparatus. The co-doping of two types of nanoparticles was found to significantly enhance the specific heat capacity of the base salt. The maximum specific heat reached 2.36 J/(g·K), showing a 50.4% increase compared to the base salt. The thermal conductivity of molten salts can be affected by nanoparticles. An observed sample demonstrated a thermal diffusivity of 0.286 mm2/s, indicating a 19.2% improvement over the base salt, which may be attributed to enhanced phonon thermal efficiency. In addition, this study revealed that while interfacial thermal resistance can enhance specific heat capacity, it can also lead to a decrease in the thermal conductivity efficiency of materials. This work can offer insights and references for the enhancement of molten salt properties.
研究领域:
材料科学
·
热能工程
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Jinlong Cai,Mengxiao Tao,Tongtong Zhang,Jian Song,Dejian Pei,Yi Jin,Zushu Li,Feng Jiang,Xiang Ling
Recycled steel slag enables high-performance C-PCMs for thermal energy storage; • A novel hierarchical skeleton achieves 69 wt% NaNO 3 loading, improved by 130%; • The prepared C-PCMs show superior heat storage density, up to 637 J/g (100–400 °C); • The prepared C-PCMs exhibit excellent chemical compatibility and cycling stability; • The mechanism of high heat storage density of prepared C-PCMs is revealed. Shape-stabilized phase change materials (PCMs) effectively address the issues of leakage and corrosion associated with pure PCMs. This study specifically tackles the low PCMs loading capacity and leakage problems of traditional steel slag skeleton by proposing a hierarchical steel slag ceramic (HSSC) structure to create shape-stabilized PCMs with high energy storage density. The desired effect is achieved through a core-shell structure with varying pore sizes within HSSC, specifically, a “large pore for PCMs storage-small pore for PCMs leakage prevention”. A comprehensive examination of unique structure of HSSC, as well as structural and thermophysical properties of the composite PCMs, is presented. The results indicate that the synergistic effect of foaming agent (SDS) and foam stabilizer (CTAB) is responsible for the high-apparent porosity (76.3%) observed in core structure of HSSC. Further modification with calcium carbonate (CaCO 3 ) and diatomite aids in creating a hierarchical structure within HSSC, characterized by a range of larger pores from 50 to 300 μm and smaller ones from 5 to 50 μm. The integration of a finely porous shell layer into HSSC significantly enhances its loading capacity for NaNO 3 salt. Specifically, NaNO 3 /C5D5-B3 exhibited the highest PCM loading ratio of 69 wt%, the largest latent heat of 117.4 J/g, and a relatively high heat storage density of 637 J/g (100–400 °C), a compressive strength of 9.94 MPa, along with a good cycling stability. This research presents a novel approach to the effective utilization of industrial solid waste and establishes a theoretical foundation for the development of superior composite PCMs.
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DOI
高影响因子
Nanomaterials
·
2025
·Vol. 15
·期 14
·1094
·
IF 4.3
Chuang Zhu,Wenxuan He,Manting Gu,Dan Zhang,Baiyuan Tian
LiNO3-NaNO3-KNO3-NaNO2has a relatively low phase-change temperature, making it suitable for low-temperature heat utilization systems. This study focuses on the performance optimization of the quaternary molten salt to advance its applicability. A series of nanocomposites consisting of nano-SiO2/MgO and the quaternary salt are prepared. Core thermophysical properties, including phase transition behaviors and thermal transport parameters, are quantified. The incorporation of nano-SiO2/MgO induces moderate adjustments to the melting point and latent heat yet demonstrates an obvious enhancement in specific heat capacity. Optimal doping at 0.7 wt.% SiO2and 0.3 wt.% MgO yields a molten-state specific heat of 1.51 J/(g·K), representing a 6% increase over the undoped base salt (1.42 J/(g·K)). By combining the thermal diffusivity properties of the samples, this study found that the doping of nanoparticles typically induces new structures in molten salts that tend to enhance the specific heat capacity while simultaneously reducing thermal diffusivity.
研究领域:
储能
·
纳米材料
·
热工工程
·
材料科学
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DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Jiamei Xu,Jicheng Liu,Kun Lin,Zijian Su,Yuanbo Zhang
Against the backdrop of rapid economic development, the demand for composite phase change materials (C-PCMs) in thermal energy storage has been steadily increasing. However, the widespread application of C-PCMs has been severely constrained by high raw material costs, the poor thermal conductivity of ceramic matrices, and substantial molten salt leakage. In this study, the phase composition was designed using thermodynamic software, and C-PCMs with an anorthite-mullite ceramic matrix were successfully fabricated from steel slag (SS) and secondary aluminum dross (SAD) as primary raw materials. This study revealed the synergistic regulatory mechanisms of anorthite and mullite on the pore size of porous ceramics, the infiltration efficiency, and the mass loss rate of C-PCMs. The experimental results demonstrated that the relative contents of anorthite and mullite could be effectively controlled by adjusting the SS/SAD ratio. An increase in anorthite content reduced the average pore size of the porous ceramic and suppressed the migration rate of molten salt within the pores, thereby decreasing both infiltration efficiency and mass loss rate. Meanwhile, the mullite phase in the C-PCMs contributed to the enhancement of thermal conductivity. Under optimized conditions, the prepared C-PCMs achieved a thermal conductivity of 1.81 W/(m·K), which was 262% that of pure NaNO 3 . The latent heat reached 77.2 J/g, and the degree of supercooling of C-PCMs decreased to 0.6 °C. After 100 thermal cycles, the mass loss rate was only 3.21%. This work provides theoretical support for the high-value-added utilization of metallurgical solid wastes and the rational design of medium-to-high-temperature C-PCMs.
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DOI
高影响因子
INTERNATIONAL JOURNAL OF THERMOPHYSICS
·
2026
·Vol. 47
·期 8
·141
·
IF 3.6
Li Yan,Tian Lantu,Wang Shuo,Zhu Qunzhi
As the key heat storage and transfer medium in concentrated solar power (CSP) systems, molten salts’ thermophysical properties, such as thermal conductivity, specific heat capacity, and thermal stability, critically determine the systems energy conversion efficiency and economic viability. However, conventional molten salts suffer from low thermal conductivity and limited energy storage density, restricting their application in high-temperature thermal energy storage. Recent advances show that doping with nanoparticles, such as Al 2 O 3 , CuO, and SiO 2 , can significantly improve these properties. Nevertheless, systematic studies on quaternary molten salt systems remain scarce. In this work, we focus on the quaternary eutectic salt H15 (15 wt% Ca(NO 3 ) 2 –5.95 wt% NaNO 3 –45.05 wt% KNO 3 –34 wt% NaNO 2 ), which demonstrates a high decomposition temperature of 597.4 °C alongside a relatively low melting point of 84.4 °C and high thermal energy storage density of 1052.41 kJ/kg. To overcome its thermal performance limitations, Al 2 O 3 nanoparticles (0.1 wt% to 3 wt%) were introduced to form a nanocomposite molten salt. The influence of varying nanoparticle loadings was assessed via DSC, HotDisk, SEM, and XRD to examine corresponding changes in phase transition behavior, thermal conductivity, viscosity, and material microstructure. This study provides theoretical and experimental support for developing high-performance, wide temperature-range thermal energy storage materials for advanced CSP systems.
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高影响因子
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