Polymorphism of a hexadecane-heptadecane binary system in nanopores

doi:10.1039/c6ra28210e

	Polymorphism of a hexadecane-heptadecane binary system in nanopores
	Lan, Xiao Zheng 1; Sui, Jian 1; Zhang, Shi Qi 1; Zhai, Min 1; Tian, Fang 1; Zhang, Jian 2
刊名	RSC ADVANCES
	2017
卷号	7 期号:18 页码:10737-10747
ISSN号	2046-2069
DOI	10.1039/c6ra28210e
文献子类	Article
英文摘要	Inspired by the interest in the confinement effect on polymorphism of alkane mixtures, phase behaviors of a hexadecane-heptadecane (n-C16H34-C17H36, C-16-C-17) binary system in the bulk and in nanopores of controlled porous glasses (CPGs) are investigated using differential scanning calorimetry (DSC) and temperature-dependent powder X-ray diffraction (XRD). As reported, bulk C-16-C-17 mixtures form two intermediate phases with monoclinic (Mdci) and orthorhombic (O-p) structures in a low temperature range and rotator phase RI in high temperature range. In the pores of CPG (300 nm), these solid phases appear in the temperatures slightly below the bulk system. The RI one- phase region extends a bit in temperature range in the mixtures of high C-17 components. In CPG (8.1 nm), the solid phases come up in much lower temperatures than the bulk. The rotator RI is found in a larger range of the temperature and composition than the bulk and in CPG (300 nm). A new phase, the rotator R-II, is observed in a narrow temperature range of high C-17 composition just before melting. XRD analysis shows diffractions from the alkane layered ordering in CPG (300 nm) with a more roughened layer surface than the bulk. Lamellar stacking of the solids in CPG (8.1 nm) is heavily perturbed. The variation in the polymorphism of C16-C17 mixtures in the nanopores is associated with the reduced ordering of the molecule arrangements. These results can help to understand the influence of confinement effect on binary mixtures of alkanes, the chain molecules.
WOS关键词	RAY-POWDER DIFFRACTION ; ROTATOR PHASES ; POROUS GLASSES ; BEHAVIOR ; CRYSTALLIZATION ; CONFINEMENT ; MCM-41 ; MICROCAPSULES ; SPECTROSCOPY ; CALORIMETRY
WOS研究方向	Chemistry
语种	英语
出版者	ROYAL SOC CHEMISTRY
WOS记录号	WOS:000395796700016
内容类型	期刊论文
源URL	[http://cas-ir.dicp.ac.cn/handle/321008/169540]
专题	大连化学物理研究所_中国科学院大连化学物理研究所
通讯作者	Lan, Xiao Zheng
作者单位	1.Shandong Agr Univ, Coll Chem & Mat Sci, Tai An 271018, Shandong, Peoples R China 2.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China
推荐引用方式 GB/T 7714	Lan, Xiao Zheng,Sui, Jian,Zhang, Shi Qi,et al. Polymorphism of a hexadecane-heptadecane binary system in nanopores[J]. RSC ADVANCES,2017,7(18):10737-10747.
APA	Lan, Xiao Zheng,Sui, Jian,Zhang, Shi Qi,Zhai, Min,Tian, Fang,&Zhang, Jian.(2017).Polymorphism of a hexadecane-heptadecane binary system in nanopores.RSC ADVANCES,7(18),10737-10747.
MLA	Lan, Xiao Zheng,et al."Polymorphism of a hexadecane-heptadecane binary system in nanopores".RSC ADVANCES 7.18(2017):10737-10747.