Article
Polymer Science
Xiaodong Yang, Bin Yu, Hui Sun, Nan Wang, Peng Liu, Jiangli Feng, Xiaogang Cui
Summary: The study investigated the crystallization kinetics, morphology, and structure of ECTFE using DSC, POM, and XRD, revealing various patterns of crystallization processes and changes in crystalline degree.
Article
Polymer Science
Beata Misztal-Faraj, Marcelina Ciupak, Ryszard Pecherski, Leszek Jarecki
Summary: The study analyzes the development of polymorphic composition in the isothermal crystallization process of unstressed amorphous PLLA, and predicts the relationship between the transformation degree of individual polymorphs and crystallization temperature as well as the overall transformation degree.
Article
Engineering, Chemical
Menghui Yao, Lingyu Wang, Shanshan Feng, Jiahui Li, Chen Fang, Suoqing Zhang, Meitang Jin, Li Tong, Zhenguo Gao, Mingyang Chen, Junbo Gong
Summary: This study compared the nucleation effects of ultrasound in different solvent environments. The results showed that solute diffusion ability and solvation effect are the main factors affecting the enhancement of nucleation rate by ultrasound.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Materials Science, Composites
Saeideh Hojatzadeh, Farshad Rahimpour, Esmail Sharifzadeh
Summary: This study evaluated the isothermal crystallization kinetics of high-density polyethylene (HDPE) nanocomposites containing different weight percentages of pure and surface-modified silica nanoparticles. The results showed that the crystallization temperature influenced the nucleation mechanism and the crystallization rate. The addition of compatible/un-compatible silica nanoparticles significantly affected the isothermal crystallization process, and surface modification had a positive effect on the crystallization rate of the nanoparticles.
POLYMER COMPOSITES
(2023)
Article
Materials Science, Multidisciplinary
Shan Zhang, Chao Wei, Jingwang Lv, Haoran Zhang, Zhilin Shi, Xinyu Zhang, Mingzhen Ma
Summary: The crystallization kinetics of Zr50Cu34Al8Ag8 bulk metallic glass under non-isothermal conditions was studied using differential scanning calorimetry. The activation energies were calculated and the crystallization mechanism was explored, revealing that the crystallization is mainly governed by diffusion-controlled three-dimensional growth.
Article
Polymer Science
Dezhi Qu, Jiayang Cai, Fei Huang, Jinyu Zhang, Huajiang Zuo, Shuai Sun, Jinghua Liu, Yongping Bai
Summary: By adding PSLDH to modify PET, excellent optical properties were achieved in the non-isothermal crystallization process, which also guided the processing of optical PET films.
Article
Materials Science, Ceramics
Zhengyue Liu, Lifeng Sun, Hui Zhao, Taiyu Xiang, Jiyu Qiu, Maofa Jiang
Summary: In this study, the phase equilibria of the CaO-SiO2-Nb2O5-Fe2O3-TiO2 system at 1200 degrees C were investigated for the first time. The solid phase coexistence region and liquidus surfaces were determined using high temperature equilibrium experiments and mathematical methods. The results provide theoretical guidance for the enrichment and extraction processes of niobium and titanium resources in the Bayan Obo tailing.
CERAMICS INTERNATIONAL
(2022)
Article
Polymer Science
Qun Yang, Run Zhang, Jing Tian, Hailong He, Ping Xue, Xiaonong Chen, Mingyin Jia
Summary: In this study, the effect of adding two types of nano-materials (multi-walled carbon nanotubes and graphene nanoplatelets) to ultra-high molecular weight polyethylene (UHMWPE) on its isothermal and non-isothermal crystallization processes was investigated. The results revealed that the nano-materials did not act as heterogeneous nucleating agents and their addition was unfavorable to the crystallization process. The samples modified by nano-materials had a lower crystallization rate than the neat UHMWPE at the initial crystallization stage, but a faster crystallization rate at the end crystallization stage. This phenomenon may be attributed to the reduction of physical entanglement points of UHMWPE molecular chains by the incorporated nano-materials, which weakened the restriction on molecular chain movement and increased the crystallization rate at the initial stage. However, the crystallization rate of the samples incorporated with nano-materials decreased rapidly with time.
JOURNAL OF POLYMER RESEARCH
(2023)
Article
Polymer Science
Beata Misztal-Faraj, Leszek Jarecki, Ryszard B. Pecherski
Summary: This paper formulates a kinetic model for the polymorphic crystallization of uniaxially oriented amorphous poly(L-lactide) based on the Hoffman-Lauritzen theory. The model considers the entire ranges of crystallization temperatures and amorphous orientation factor. The model predicts that the crystallization to the stable α form is controlled by the rate of transformation from the amorphous phase to α'.
Article
Biochemistry & Molecular Biology
Hongwei Yang, Jianghua Du
Summary: This study investigates the crystallization kinetics of GF/PLA composites by melt blending GFs and PLA. The results show that the presence of GFs significantly promotes PLA crystallization, accelerates the crystallization rate, and shortens the crystallization time. Additionally, the calculation of crystallization activation energy indicates that GFs enhance the crystallization capacity and decrease the effective potential barrier of the composite.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Chemistry, Applied
Bingjie Hu, Qianwang Zheng, Zhexi Weng, Jie Xiao, Yong Cao, Yaqi Lan
Summary: This study systematically investigated the influence of non-isothermal conditions on multi-component oleogel and found that the cooling rate modulated the crystal structure, physical properties, and assembly mechanism.
Article
Thermodynamics
Pixiang Wang, Yifen Wang, Xueqi Wang, Yucheng Peng, Shaoyang Liu
Summary: The crystallization kinetics of isotactic homopolymer polypropylene (HPP), impact copolymer polypropylene (ICPP), and their composites were investigated. The Avrami-Jeziorny and Mo models accurately described the crystallization process. The nucleation activity and crystallization rate were influenced by the content of ICPP, with the highest rate observed at 60% ICPP. The changes in chain mobility and crystal-crystal interactions accounted for the fluctuations in crystallization rate and activation energy.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Polymer Science
Beixue Yang, Yu Jia, Jiaye Du, Jun Zhang
Summary: This study explores the effects of nucleating agent content on the non-isothermal crystallization kinetics, isothermal crystallization morphologies, and macroscopic properties of poly-propylene (PP), aiming to achieve the desired crystal state directly. It is found that introducing 0.3 phr nucleating agent improves initial crystallization and melting temperature by 10 degrees C, as well as enhances crystallization rate and crystallinity. Loading 0.5 phr nucleating agent refines the crystal size to 40 μm uniformly and reduces crystallization time to 1.5 min, resulting in significant improvements in tensile and physical properties.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Polymer Science
Akihiko Toda
Summary: The crystallization kinetics of poly(butylene terephthalate) under high supercooling was investigated using Temperature-Modulated Fast Scanning Calorimetry (TM-FSC). The study found a temperature dependence of crystal growth rate and compared it with the peak time of heat flow during isothermal crystallization. The crystal growth rate was found to be practically determined by a mobility factor near the glass transition.
Article
Thermodynamics
Nithya Christopher, Kritika Anand, A. K. Srivastava, Nidhi Singh
Summary: The thermal and kinetic analysis of partially crystallized Hf1.5Zr0.5Co10FeB melt-spun ribbon was studied using differential scanning calorimetry, showing a three-step exothermic crystallization process. The kinetics of crystallization revealed that the alloy's crystallization is initially governed by three-dimensional growth, shifting to one-dimensional growth later.X-ray diffraction confirmed the crystalline phases in optimized annealed samples, while scanning electron microscopy investigated the microstructural dependence of grain growth during annealing. Magnetic hysteresis loop measurements demonstrated the evolution of hard magnetic properties upon annealing at 823 K.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Engineering, Chemical
Qing Han, Mengqing Shi, Linkai Han, Di Liu, Mingwei Tong, Yuxin Xie, Zhonghua Xiang
Summary: Developing highly efficient bifunctional oxygen electrocatalysts is crucial for zinc-air flow batteries. Metal-organic frameworks (MOFs) and covalent organic polymers (COPs) have emerged as promising alternatives due to their designable and controllable atomic-level structures. However, their catalytic performances are limited by conductivity and catalytic activity. In this study, nanosheet FeNi-MOF and iron phthalocyanine rich COP hybrid materials are assembled through the pi-pi stacking effect to create highly efficient bifunctional electrocatalysts. The resulting catalyst exhibits superior catalytic performance and stability, making it a promising candidate for zinc-air flow batteries.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Daria Grigorash, Dmytro Mihrin, Rene Wugt Larsen, Erling H. Stenby, Wei Yan
Summary: The article introduces a new approach to describe the cross-association between molecules, allowing for the simulation of weakly bound molecular complexes with different conformations in mixtures. By incorporating this approach into the equation of state, accurate predictions of vapor-liquid equilibrium and liquid-liquid equilibrium can be made. The new method is validated through experiments on alcohol and acid mixtures, with the results compared to experimental data, demonstrating its accuracy and reliability.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Mohammed Al-Sharabi, Daniel Markl, Vincenzino Vivacqua, Prince Bawuah, Natalie Maclean, Andrew P. E. York, Axel Zeitler
Summary: This study used terahertz pulsed imaging to investigate the transport process of different solvents into ceramic catalytic materials. The results showed that the heating rate of the samples influenced the water transport rate, while the viscosity of 1-octanol slowed down its transport.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Chukwunonso Anyaoku, Sati Bhattacharya, Rajarathinam Parthasarathy
Summary: This study aimed to enhance understanding of settling dynamics in viscoelastic fluids by developing a semi-empirical correlation and a dimensionless ratio, which accurately described the characteristics of settling suspensions.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Antti I. Koponen, Janika Viitala, Atsushi Tanaka, Baranivignesh Prakash, Olli-Ville Laukkanen, Ari Jasberg
Summary: This study focuses on the development of foam application chemicals for the paper and board industry. The research explores the rheology of the polyvinyl alcohol foam used in the process. Measurements were conducted to determine the foam viscosity and slip flow. The results suggest that slip flow contributes significantly to the total flow rate, and the obtained viscosity and slip models provide a solid foundation for industrial processes.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Dalei Sun, Jinghui Cai, Yating Yang, Zhiwu Liang
Summary: In this study, Fe-doped alpha-Bi2O3 catalysts with different Fe/Bi molar ratios were synthesized and utilized in the carbonylation of isobutyl amine with CO2. The results showed that Fe doping significantly enhanced the catalytic abilities of alpha-Bi2O3.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Yuan Tian, Xinxin Wang, Yanrong Liu, Wenping Hu
Summary: This paper predicts the solubility of nitrogen gas in ionic liquids (ILs) using two quantitative structure-property relationship (QSPR) models. By combining machine learning methods and ionic fragments contribution method, the accuracy and reliability of the prediction models are improved.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Liwang Wang, Wei Liu, Pan Yang, Yulong Chang, Xiaoxu Duan, Lingyu Xiao, Yaoming Hu, Jiwei Wu, Liang Ma, Hualin Wang
Summary: This study investigates the effective phase interfacial area (ae) of hydro-jet cyclones at different injection angles. The results show that a 45 degrees upward incidence angle yields the most favorable flow field characteristics for efficient mass transfer. The significant enhancement in ae of the hydro-jet cyclones offers the advantage of reducing equipment volume and cost savings.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Chuanjun Wu, Jiangzhi Chen, Jiyue Sun, I-Ming Chou, Shenghua Mei, Juezhi Lin, Lei Jiang
Summary: In this study, the solubility of H2S hydrate in water was measured using Raman spectroscopy. The results showed that the solubility increases with temperature under certain equilibrium conditions, and the solubility also depends on pressure and temperature under different equilibrium conditions. A thermodynamic model based on the van der Waals-Platteeuw theory was developed to predict the solubility, demonstrating its accuracy.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Lorenzo Brivio, Serena Meini, Mattia Sponchioni, Davide Moscatelli
Summary: This study investigates the influence of three main parameters and proposes a kinetic model to predict the optimal operating conditions for high yield of dimethyl terephthalate (DMT) in the chemical recycling process of polyethylene terephthalate (PET).
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Hongju Lin, Fanhui Liao, Yanchang Chu, Mingyu Xie, Lun Pan, Yuanyuan Wang, Lijian Leng, Donghai Xu, Le Yang, Gangfeng Ouyang
Summary: A honeycomb NiCo/C-Na catalyst with a micro-meso-macroporous structure has been fabricated and shown to have significantly higher catalytic activity for the decarboxylation of fatty acids. It also proves to be efficient in upgrading sludge HTL bio-crude, resulting in a biofuel with decreased viscosity and increased density.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Xiaoxian Li, Rui Li, Min Lin, Mingde Yang, Yulong Wu
Summary: A series of coated non-noble metal porous carbon catalysts were synthesized and applied to the aqueous-phase deoxygenation of algal bio-oil. One of the catalysts showed excellent deoxygenation selectivity and catalytic activity at 250 degrees C. The catalyst exhibited good hydrothermal stability and the reaction mechanism was proposed based on product analysis and active site analysis.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
M. V. Chudakova, M. V. Popov, P. A. Korovchenko, E. O. Pentsak, A. R. Latypova, P. B. Kurmashov, A. A. Pimenov, E. A. Tsilimbaeva, I. S. Levin, A. G. Bannov, A. V. Kleymenov
Summary: A series of catalysts with different potassium contents were prepared using solution combustion synthesis and characterized using various techniques. The results showed that the potassium content affected the phase composition and texture of the catalysts. The addition of a small amount of potassium resulted in a change in particle size distribution, leading to higher hydrogen yield. The Ni-1%K2O/Al2O3 catalyst exhibited the highest hydrogen yield at temperatures of 675 and 750 degrees Celsius.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Aliakbar Roosta, Nima Rezaei
Summary: In this study, we modified the electrolyte cubic plus association equation of state (e-CPA EoS) and integrated it with two electrical conductivity models to estimate the electrical conductivity of 11 monovalent electrolyte solutions in water. The modified e-CPA model demonstrated better performance and the hybridization with electrical conductivity models resulted in two predictive models for estimating the electrical conduction of dilute and concentrated electrolyte solutions. These predictive models showed relative average percentage deviations (AARD) of 11.15% and 13.87% over wide ranges of temperature and electrolyte concentration.
CHEMICAL ENGINEERING SCIENCE
(2024)
Article
Engineering, Chemical
Haoren Niu, Jianzheng Wang, Qingzhu Jia, Qiang Wang, Jin Zhao, Fangyou Yan
Summary: A study developed two quantitative structure-property relationship models for the complexation performance of alpha- and beta-cyclodextrins and validated their stability and predictive ability through internal and external validation. The models showed robustness and satisfactory performance, as demonstrated by the experimental results and model validations. These models can effectively predict the binding constants between cyclodextrins and various types of molecules, providing valuable tools for cyclodextrin design.
CHEMICAL ENGINEERING SCIENCE
(2024)