Crystals
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2020
·Vol. 10
·期 6
·506
·
IF 2.404
Yang Li,Yang Zhang,Xue Zhong Wang
The secondary nucleation process of 2,2-azobisisobutyronitrile (AIBN) seeded crystallisation in methanol in a stirred tank reactor was studied at varying initial supersaturation levels, temperatures, crystal seed numbers, and stirrer speeds. The average secondary nucleation rate, induction time, and agglomeration ratio were measured using on-line microscopic imaging. The initial supersaturation level, temperature, and stirrer speed were found to be positively correlated with the secondary nucleation rate. A small change in the crystal seed number, i.e., 1-20, did not substantially affect the secondary nucleation rate throughout the secondary nucleation process. An increase in the initial supersaturation level and crystal seed number decreased the induction time, and an increase in the strength of agitation promoted the initiation of secondary nucleation at a stirring rate greater than 250 revolutions per minute (rpm). Temperature exerted a complex effect on the induction time. Regarding the agglomeration ratio, the initial supersaturation level positively correlated with the agglomeration ratio, while the stirrer speed negatively correlated with this parameter. Finally, based on the measured data, the average secondary nucleation rate, induction time, and final crystal suspension density were correlated. This study provides guidance for the control of supersaturation, induction time, stirring, and other factors in the crystal seed addition process in AIBN crystallisation.Keywords:secondary nucleation kinetics;modelling;seeds adding process;on-line imaging;2,2-azobisisobutyronitrile (AIBN)
研究领域:
化学工程
·
结晶工艺
✓ 已验证
产品关联
DOI
高影响因子
THERMOCHIMICA ACTA
·
2025
·
IF 3.5
Jiajun Guo,Wentao Ji,Yabei Xu,Zhitao Chen,Yang Su,Yan Wang
This paper takes the typical thermally unstable azo compound AIBN as the research object. For the key free radicals in its explosive chain reaction, two inhibitors and two target inhibitory additives were selected. Through a 20-liter spherical test device and gas-phase product analysis, the inhibitory effect of the target inhibitory additives on the explosive chain reaction was derived. The inhibition mechanism was expounded from both physical and chemical inhibition aspects through ARC experiments.The experimental results show that AIBN has very high risk of explosion and severity,. However, the compounding of DW with FAS and KI can effectively inhibit the explosion pressure and achieve complete explosion suppression, while also inhibiting the generation of toxic gases. The ARC studies discovered that FAS and KI can increase the adiabatic temperature of the thermal decomposition process of AIBN and significantly reduce the apparent activation energy of the reaction to achieve the effect of inertia.
研究领域:
化学安全
·
化学动力学
·
热分析
·
防爆技术
·
气相化学
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Xiangdong Wang,Zhisen Wang,Xiaoyu Wang,Lingying Shi,Rong Ran
As a smart wearable sensor device, the mildew of the biocompatible hydrogel limits its application. In this paper, silver nanoparticles were prepared by solid-state reduction of hydroxyethyl cellulose and compounded into a chemically cross-linked hydrogel as an antibacterial, flexible strain sensor. Because the high surface energy of silver nanoparticles can quench free radicals, we designed three initiators to synthesize hydrogels: ammonium persulfate (APS), 2,2'-Azobis(2-methylpropionitrile) (AIBN) and 2,2'-azobis(2-methylpropionamidine) dihydrochloride (AIBA). Impressively, silver nanoparticles composite hydrogel could only be successfully fabricated and triggered by the AIBN. The mechanical property of the composite hydrogel (0.12 MPa at 704.33 % strain) was significantly improved because of dynamic crosslinking point by HEC. Finally, the composite hydrogels are applied to the field of antibacterial strain sensor and the highest Gauge Factor (GF) reached 4.07. This article proposes a novel, green and simple strategy for preparing silver nanoparticles and compounding them into a hydrogel system for antibacterial strain sensor.
研究领域:
材料科学
·
纳米技术
·
生物传感器
·
抗菌材料
✓ 已验证
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Youhuan Zhu,Pengpeng Chen,Yifeng Zhou,Wangyan Nie,Ying Xu
Sustainable alkaline metal ion batteries using organic electrodes are promising for large-scale renewable energy storage. Traditional anode compounds are always anchored with harmful aromatic rings , which results in high toxicity. In this work, a series of aromatics-free organic electrode material based on an azo group is applied in alkaline metal ion batteries . Lithium-, sodium- and potassium-ion batteries based on acyclic compound 2, 2′-azobis(2-methylpropionitrile) (AIBN) as an anode material exhibit low toxicity. In situ Raman and ex situ Fourier-transform infrared spectroscopy results reveal that the azo group serves as the electrochemical active site for the reversible insertion and extraction of alkaline metal ions. Another compound with low toxic, 2,2′-azobis(2-methylpropionamidine) dihydrochloride (AIBA), which containing two active sites of azo and imine groups confirmed with in situ Raman and ex situ FT-IR, are applied in lithium-ion batteries. Furthermore, harmless sodium ion battery has been assembled with azodicarbonamide (CONH). Therefore, this acyclic compound offers possibilities in novel organic electrode materials for developing toxin-free and environmental-friendly alkaline metal ion batteries.
研究领域:
能源存储
·
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Arabian Journal of Chemistry
·
2022
·
IF 6.212
Min Liang,Huixia Zhao,Suyi Dai,Chang Yu,Haijun Cheng,Weiguang Li,Fang Lai,Li Ma,Xiongmin Liu
1,3-Butadiene is the simplest conjugated diene, which is widely used in polymer materials, organic synthesis, and other fields. The investigation of its thermal stability and oxidation characteristics is necessary for production, transportation, and use safety. The pressure and temperature behavior of the autoxidation reaction of 1,3-butadiene with oxygen were determined using a custom-designed mini closed pressure vessel test (MCPVT). The effects of free radical initiators CHP and AIBN on the oxidation reaction were investigated. The thermal decomposition characteristics of oxidation products were measured by differential scanning calorimetry (DSC), and its hazards were discussed. The results showed that the oxidation reaction of 1,3-butadiene was easy to occur. Moreover, the activation energies of autoxidation, CHP-initiated oxidation, and AIBN-initiated oxidation reaction were 20.85 kJ·mol −1 , 33.30 kJ·mol −1 , and 56.27 kJ·mol −1 , respectively. In addition, the oxidation products were analyzed by headspace sampler-gas chromatography-mass spectrometry (HS-GC–MS), GC–MS, and iodometry. Some of 1,3-butadiene oxidation products under three conditions are the same, for example, 3-butene-1,2-diol, 4-vinylcyclohexene, 2(5H)-furanone, 2-propen-1-ol, and 2,6-cyclooctadien-1-ol. According to the reaction products, the oxidation reaction pathway of 1,3-butadiene was described. The research results are significant for avoiding fire and explosion accidents in the production, transportation, and application of 1,3-butadiene.
研究领域:
化学工程
·
有机化学
·
热分析
·
安全科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）