An X‐Ray Study of the Stepwise Melting of Anhydrous Sodium Palmitate

Autor:	R. H. Ferguson, F. B. Rosevear, H. Nordsieck
Rok vydání:	1948
Předmět:	Crystal Crystallography Chemistry Liquid crystalline Isotropy Anhydrous X-ray General Physics and Astronomy Long spacing SODIUM PALMITATE Physical and Theoretical Chemistry Lower temperature
Zdroj:	The Journal of Chemical Physics. 16:175-180
ISSN:	1089-7690 0021-9606
Popis:	X‐ray powder patterns on anhydrous sodium palmitate show that the five phases already known to occur between crystal and isotropic melt can be grouped into two basic structures. Both structures are liquid crystalline, i.e., crystalline in the direction of the long spacing and liquid‐like laterally. Between the lower temperature ``waxy'' structure, which includes the previously known subwaxy, waxy, and superwaxy phases, and the higher temperature ``neat'' structure, which includes subneat and neat, there is a pronounced break in the curve of long spacing vs. temperature; in addition, the three waxy phases exhibit two diffuse short spacing rings, whereas the neat phases exhibit only one. These pattern differences lead to the interpretation that the waxy phases contain structural restraints on molecular position and motion not present in the neat phases.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::7690d063ff3eed14d349d8b9c015c339 https://doi.org/10.1063/1.1746829 Zobrazit plný text záznamu