A study of the dynamics of n-alkane in the rotator phase by using the pulse-field-gradient spin-echo 1H NMR method

Autor:	Shigeki Kuroki, Shingo Matsukawa, Isao Ando, Hiromichi Kurosu, Hideyuki Yamakawa
Rok vydání:	1998
Předmět:	Alkane chemistry.chemical_classification Range (particle radiation) Chemistry Transition temperature Phase (matter) Dynamics (mechanics) Analytical chemistry Proton NMR Spin echo General Physics and Astronomy Physical and Theoretical Chemistry Pulse field
Zdroj:	Chemical Physics Letters. 283:333-336
ISSN:	0009-2614
DOI:	10.1016/s0009-2614(97)01394-8
Popis:	The self-diffusion coefficient ( D ) and 1 H spin–spin relaxation time ( T 2 ) of n -alkane, n -C 24 H 50 , were measured in the rotator and liquid phases over a wide range of temperatures by means of pulse-field-gradient spin–echo 1 H NMR, in order to clarify the molecular motion of the alkane in the rotator and liquid phases. With a decrease in temperature from the liquid phase (65 to 51°C) to the rotator phase (50 to 45°C), the temperature dependence of D is abruptly changed at the transition temperature and the slope for the rotator phase is much larger than that for the liquid phase. This means that the mechanism of their diffusional processes is different. Further, it is found that the temperature dependence of the 1 H T 2 shows similar behavior.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::cd8f22cefa9ee451aa5159f7f686f335 https://doi.org/10.1016/s0009-2614(97)01394-8 Zobrazit plný text záznamu Full Text from ScienceDirect