Review
Engineering, Chemical
Chenqian Xu, Zhenmin Cheng
Summary: Ionic liquids are considered the safest solvents in high-temperature applications due to their non-flammable properties, with thermogravimetric analysis being extensively used for studying their thermal stability. Isoconversional methods are found to be superior to Arrhenius methods in calculating activation energy, and the use of compensation effect and master plots is suggested for pre-exponential factor calculation. The structure of cations has some influence on thermal stability, but anions play a larger role. Developing dicationic ILs can lead to enhanced thermal stability.
Article
Materials Science, Multidisciplinary
Xutong Yang, Xiao Zhong, Junliang Zhang, Junwei Gu
Summary: In this study, a side chain liquid crystal epoxy based on biphenyl mesomorphic unit was successfully synthesized, and a liquid crystal epoxy film with thermal conductivity and self-healing properties was prepared. The liquid crystal epoxy showed high thermal conductivity, excellent self-healing performance, wide service temperature range, and good thermal stability. It is expected to have wide application prospects in the fields of flexible electronic devices and intelligent structures.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
J. Alberto Arroyo-Valdez, Gonzalo Viramontes-Gamboa, Roberto Guerra-Gonzalez, Mariana Ramos-Estrada, Enrique Lima, Jose L. Rivera
Summary: Molecular dynamics simulations show that ionic liquids containing alkylated imidazoles exhibit a bimodal distribution of cation conformations (folded/unfolded), where the concentration of folded cations increases with temperature, reducing liquid cohesivity. At the interface, an outermost layer of cations can tilt towards and cover a layer of adsorbed anions, resulting in stability in transverse directions and instability in the normal direction at temperatures around thermal instability, limiting the rate of vaporization of neutral ion pairs.
Article
Thermodynamics
Alok Rout, K. Chandran, M. Lavanya, N. Ramanathan
Summary: This study investigated the thermal stability of a novel CHON based ionic liquid for the separation of actinides and fission products, showing stability up to a certain temperature. Thermal decomposition data was compared between nitric acid equilibrated ionic liquid phases and biphase systems, indicating the impact of nitric acid on thermal stability.
THERMOCHIMICA ACTA
(2021)
Article
Chemistry, Physical
Asghar Shirani, Jihung Lee, Diana Berman
Summary: Ionic liquid-based solid polymer electrolytes with stable thermal properties and low electrical resistivity were evaluated in this study. PEGDA was chosen as the polymer component for its uniform SPE formation and better thermal stability compared to Nafion. Six IL candidates were tested to investigate the effect of their hydrophobicity/hydrophilicity on the resulting SPE, with BMIM.MS showing the highest gas absorption capacity.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Polymer Science
Josh D. Wolfgang, Jennifer L. Dysart, Matthew Laskoski
Summary: Phthalonitrile (PN) polymers are high-temperature thermosetting resins with long cure-times hindering their use in certain applications. The addition of dicyanamide-based ionic liquid and aromatic amine allowed for lower cure temperatures and shorter cure times. The results showed significant improvements in the curing process and properties of the PN resins.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Chemistry, Physical
Woonghee Choi, Gi Hyeon Sung, Woong-Ryeol Yu, Dong Wook Kim
Summary: The volatility of liquid electrolytes is a major obstacle in the fabrication of efficient and safe lithium-ion batteries. A novel ionic liquid crosslinker was synthesized and used for thermal crosslinking to prepare a gel polymer electrolyte (GPE) with higher thermal stability and ionic conductivity than liquid electrolytes or solid electrolytes.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Physical
Mojtaba Rezaeian, Mohammad Izadyar, Mohammad Reza Housaindokht
Summary: The thermal decomposition mechanisms of amino acid ionic liquids (AAILs) were investigated using density functional theory. The results showed that the SN2 and alkyl rearrangement mechanisms are the most probable routes. The environment polarity plays an important role in the thermal decomposition mechanism, especially in the alkyl rearrangement route.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Chemistry, Multidisciplinary
Junyang Wang, Rusong Chen, Lufeng Yang, Mingwei Zan, Penghao Chen, Yu Li, Wenjun Li, Huigen Yu, Xiqian Yu, Xuejie Huang, Liquan Chen, Hong Li
Summary: Battery safety concerns have become more prominent as the demand for higher energy density lithium-ion batteries (LIBs) increases. This study demonstrates the use of solid electrolyte Li6.5La3Zr1.5Ta0.5O12 (LLZTO) to supply lithium ions to charged LiCoO2, effectively improving the safety performance of the battery.
ADVANCED MATERIALS
(2022)
Article
Thermodynamics
Zhi-Ping Li, An-Chi Huang, Yan Tang, Hai-Lin Zhou, Ye-Cheng Liu, Chung-Fu Huang, Chi-Min Shu, Zhi-Xiang Xing, Jun-Cheng Jiang
Summary: This study tested and analyzed the thermal hazards and stability of the product in the toluene sulfonation process. By calculating kinetic parameters and simulating the reaction mechanism, helpful suggestions for safety were proposed.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Chemistry, Physical
Dzmitry H. Zaitsau, Riko Siewert, Andrey A. Pimerzin, Mark Buelow, Christoph Held, Manuel Loor, Stephan Schulz, Sergey P. Verevkin
Summary: Ionic liquids are effectively used for tuning the composition and morphology of nanoparticles or stabilizing agents for nanoparticles in catalytic dehydrogenation processes. The thermodynamic properties of ionic liquids, such as vapor pressures and vaporization enthalpies, play a key role in optimizing these processes.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Chemistry, Physical
Dzmitry H. Zaitsau, Riko Siewert, Andrey A. Pimerzin, Mark Buelow, Christoph Held, Manuel Loor, Stephan Schulz, Sergey P. Verevkin
Summary: Ionic liquids are effectively used for tuning the composition and morphology of nanoparticles or stabilizing agents for catalytic dehydrogenation. By measuring vapor pressures and vaporization enthalpies, certain series of ionic liquids have been identified as suitable for catalytic applications due to their thermal stability. Experimental and theoretical analysis provide insights into the behavior of these ionic liquids during vaporization and decomposition processes.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Chemistry, Physical
Zhixia Wang
Summary: The tropine-based ionic liquid surfactant (TILS) has been found to possess exceptional biological, botanical, and pharmacological capabilities. This study investigated the essential properties of TILS, including thermal stability, surface activity, foaming properties, and solubilization. The results showed that TILS's temperature stability was influenced by the characteristics of its anions, and the performance of the foam was affected by surface tension, solubility, and the HLB value of the TILS solution. The micellar and acid-base characteristics of TILS contributed to the solubilization of curcumin in its solution.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Chemistry, Physical
Yinan Zhao, Qingtao Zeng, Changcheng Jiang, Xuejun Lai, Hongqiang Li, Zhengzhong Wu, Xingrong Zeng
Summary: This study presents a significant advancement in the construction of self-powered fire protection materials through the use of phosphorous-containing ionic liquids to fabricate ionogels. The produced ionogels exhibit good ionic conductivity and thermoelectric effect, enabling temperature sensing, sensitive fire warning, and excellent flame retardancy. Additionally, the ionogels demonstrate high durability and self-powering capabilities, making them suitable for powering fire warning circuits and electronics.
Article
Thermodynamics
Vignesh Murali, Gianmarco Venditti, Jos C. H. Zeegers, Anton A. Darhuber
Summary: The study investigated the deposition of lines of water onto a thin porous medium using a droplet-on-demand, single-nozzle inkjet system. Both experimental and numerical simulations were employed to analyze the dynamics of moisture distribution and temperature profiling of the substrate. The results indicated that substrate speed and droplet frequency significantly influenced the moisture transport and temperature distribution of the paper.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Engineering, Chemical
Yilin Zhao, Nengcheng Zhou, Min Hua, Xiuxia Guo, Wenxing Zhang, Huichun Jiang, Xuhai Pan, Juncheng Jiang
Summary: In this study, the thermal stability of tert-butyl perbenzoate (TBPB) mixed with different concentrations of toluene and p-tert-butylcatechol (TBC) was investigated. It was found that toluene effectively reduces the thermal hazard during TBPB decomposition, and the moderate addition of TBC and toluene improves the thermal stability of TBPB, enhancing its safety in industrial applications.
CHEMICAL ENGINEERING COMMUNICATIONS
(2023)
Article
Thermodynamics
Xueliang Zhu, Xuhai Pan, Yu Mei, Jiajia Ma, Hao Tang, Yucheng Zhu, Lian X. Liu, Juncheng Jiang, Tao Chen
Summary: Superheated liquid jets disintegrate into droplets due to thermal nonequilibrium induced flashing and mechanical forces during depressurization. This study investigates the breakup and droplet formation of superheated liquid jets under depressurized releases using an experimental tank. The interaction between thermodynamic and mechanical effects is discussed and a quantitative relationship is established. The results show different breakup modes and highlight the importance of considering the cooling effect in addition to thermodynamic and mechanical effects.
APPLIED THERMAL ENGINEERING
(2023)
Article
Energy & Fuels
Yiming Jiang, Xuhai Pan, Min Hua, Zhilei Wang, Tao Zhang, Qingyuan Wang, Yunyu Li, Andong Yu, Juncheng Jiang
Summary: This paper investigates the impact of flow directions in T-shaped tubes on over-pressure, shock wave, and spontaneous ignition. The results show that although the evolution of upstream pressure is not significantly different, the flow features in the trunk and branch pipelines downstream of the bifurcation point vary significantly. Additionally, the flow direction affects the critical release pressure required for self-ignition.
Article
Engineering, Chemical
Dayong Xu, Jie Zhang, Lijing Zhang, Xuhai Pan
Summary: Through sophisticated numerical simulations and nonlinear finite element analysis, this study proposes an effective method for evaluating the minimum safety liquid level of storage tanks to prevent buckling under extreme winds. By considering multiple correlated time histories of fluctuating wind loads and conducting nonlinear finite element analysis, the safety liquid level of storage tanks can be assessed more accurately. Based on multiple case studies, this method has been applied to assess the minimum safety liquid level in over one hundred scenarios of severe winds. The results show that 94 scenarios are considered safe, while 19 scenarios are considered unsafe. However, 13 scenarios are considered safe according to the proposed method but unsafe according to the Eurocode and static wind buckling analysis, suggesting that the peak velocity pressure formula in the Eurocode and the static wind buckling analysis in previous studies systematically underestimate the role of fluctuating wind. This proposed methodology can help make quantitative decisions regarding wind disasters.
JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES
(2023)
Article
Chemistry, Physical
Andong Yu, Nengcheng Zhou, Xinmiao Liang, Min Hua, Xuhai Pan, Yiming Jiang, Juncheng Jiang
Summary: In this study, the thermal decomposition behavior of benzoyl peroxide (BPO) and its reaction with toluene and sodium hydroxide (NaOH) were investigated. The results showed that NaOH improved the thermal stability of BPO while toluene facilitated its decomposition. This research is important for understanding the thermal hazards of BPO and ensuring the safety of industrial processes.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Thermodynamics
Yiming Jiang, Xuhai Pan, Qiong Cai, Oleksiy V. Klymenko, Zhilei Wang, Min Hua, Qingyuan Wang, Juncheng Jiang
Summary: This study investigates the evolution of hydrogen flame near the tube exit and finds that the flame evolution is influenced by both shock wave and vortex in the near-field region. Two different types of flame can transform into each other and a hybrid flame can be formed in the transition region. It is also discovered that the flame in the transition region has features of both types and is easily extinguished.
COMBUSTION AND FLAME
(2023)
Article
Thermodynamics
Xueliang Zhu, Xuhai Pan, Jiajia Ma, Yu Mei, Hao Tang, Yucheng Zhu, Lianxiang Liu, Juncheng Jiang, Tao Chen
Summary: This study investigates the dynamic behavior of superheated liquids and their impact on flashing jet during accidental releases. The results show a strong correlation between the depressurization and the initial ηp0, and flashing occurs upstream and chokes the two-phase flow, reducing the release rate. These findings provide insights for the prevention and mitigation of accidents involving superheated liquid releases.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Engineering, Chemical
Xinxin Guo, Cunyu Lu, Yameng Li, Chendong Zhang, Xuhai Pan, Min Hua, Lijing Zhang, Juncheng Jiang
Summary: A solid-liquid composite powder with core-shell structure is successfully prepared under theoretical guidance. The factors affecting the preparation process include stirring speed, solid-liquid mass ratio, stirring time, and additive concentration. Experimental results show that the core-shell powder containing NH4H2PO4 (WS-2) exhibits better diesel flame suppression performance compared to commercial dry powder (CDP) and common core-shell powder (WS-1). Furthermore, WS-2 also demonstrates the highest degree of temperature drop, being 21.14% and 39.82% higher than CDP and WS-1, respectively. The study reveals that WS-2 possesses multiple inhibitory effects such as isolation, cooling, asphyxiation, and chemical suppression, indicating its excellent fire extinguishing performance. This research is of great significance for determining technological parameters and applying core-shell powders.
Article
Engineering, Environmental
Andong Yu, Juan Zhou, Min Hua, Xuhai Pan, Juncheng Jiang, Sanming Wang
Summary: This study investigates the thermal hazard of the styrene polymerization process through reaction calorimetry experiments and gas chromatography experiments. The thermal runaway criterion for the polymerization reaction is deduced by combining the experimental results. The phase space of the system is reconstructed using the delayed coordinate method to obtain the reconstructed divergence criterion (re-div). Experimental results show that the exothermic heat and adiabatic temperature rise of the polymerization reaction increase logarithmically with the initial reaction temperature. The analytical divergence criterion (div) obtained through the analytical method is more accurate and effective compared to the numerically calculated div. After experimental verification, it is confirmed that the re-div can predict and accurately determine whether the reaction is out of control in advance.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
Article
Engineering, Environmental
Yiming Jiang, Xuhai Pan, Tao Zhang, Zhilei Wang, Xilin Wang, Qingyuan Wang, Yunyu Li, Min Hua, Juncheng Jiang
Summary: This paper investigates the shock waves and self-ignition in tubes with T-shaped structure. The study reveals that the shock wave intensity decreases after passing through the T-shaped region and is lower in the branch pipeline. The flow field becomes extremely complex after shock waves enter the T-shaped region, exhibiting different shockwave structures and multiple reflections.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)