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Liu Y, Wu Y, Yao J, Yin J, Lu J, Mao J, Yao M, Luo F. Confined Crystallization and Melting Behaviors of 3-Pentadecylphenol in Anodic Alumina Oxide Nanopores. ACS OMEGA 2021; 6:18235-18247. [PMID: 34308054 PMCID: PMC8296606 DOI: 10.1021/acsomega.1c02112] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Accepted: 06/28/2021] [Indexed: 06/13/2023]
Abstract
To explore the effects of end groups on the confined crystallization of an alkyl chain, 3-pentadecylphenol (PDP) was infiltrated into the anodic aluminum oxide template (AAO) to investigate the melting and crystallization behaviors of PDP in a nanoconfined environment. Wide-angle X-ray diffraction (WAXD) found that the solid-solid phase transition of PDP occurred under confined conditions, and the absence of the (00L) reflections indicated that the stacking of the end groups of the alkyl chain layered structure was seriously disturbed. Thermal analysis (TG) showed that the thermal stability of the confined samples decreased due to the confinement effect, and the introduction of end groups made the confinement effect more obvious. Differential scanning calorimeter (DSC) results well reflected the space-time equivalence in the PDP crystallization processes, i.e., the solid-solid phase transition can be achieved by reducing the cooling rate or confining PDP in the nanometer space. Compared with C15, the introduction of the end groups with a phenol ring led to the disappearance of the solid-solid phase transition of an alkyl chain at high cooling rates. In the confined environment, the introduction of the end groups with a phenol ring caused the melting double peaks of the alkyl chain to become a single melting peak, and it also caused the disappearance of the surface freezing monolayer for alkyl chains. Through the analysis of crystallinity, it was found that AAO-PDP was more sensitive to AAO pore size changes than AAO-C15, the X c of AAO-PDP had a good linear relationship with the pore size d, but the X c of the AAO-C15 had a nonlinear relationship with the pore size d. Attenuated total reflection (ATR)-IR proved that in the confined environment, the order of the alkyl chain decreased and the degree of chain distortion increased.
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Affiliation(s)
- Yongdong Liu
- State
Key Laboratory of High-Efficiency Coal Utilization and Green Chemical
Engineering, Ningxia University, 489 Helanshan West Road, Yinchuan 750021, China
| | - Yonghong Wu
- State
Key Laboratory of High-Efficiency Coal Utilization and Green Chemical
Engineering, Ningxia University, 489 Helanshan West Road, Yinchuan 750021, China
| | - Jianqi Yao
- State
Key Laboratory of High-Efficiency Coal Utilization and Green Chemical
Engineering, Ningxia University, 489 Helanshan West Road, Yinchuan 750021, China
| | - Jiajie Yin
- State
Key Laboratory of High-Efficiency Coal Utilization and Green Chemical
Engineering, Ningxia University, 489 Helanshan West Road, Yinchuan 750021, China
| | - Jing Lu
- State
Key Laboratory of High-Efficiency Coal Utilization and Green Chemical
Engineering, Ningxia University, 489 Helanshan West Road, Yinchuan 750021, China
| | - Jie Mao
- State
Key Laboratory of High-Efficiency Coal Utilization and Green Chemical
Engineering, Ningxia University, 489 Helanshan West Road, Yinchuan 750021, China
| | - Min Yao
- State
Key Laboratory of High-Efficiency Coal Utilization and Green Chemical
Engineering, Ningxia University, 489 Helanshan West Road, Yinchuan 750021, China
- Ningxia
Baofeng Energy Group, Yinchuan 750001, China
| | - Faliang Luo
- State
Key Laboratory of High-Efficiency Coal Utilization and Green Chemical
Engineering, Ningxia University, 489 Helanshan West Road, Yinchuan 750021, China
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