Thermal expansion behavior of hydrate paramylon in the low-temperature region.
Carbohydr Polym
; 91(2): 543-8, 2013 Jan 16.
Article
en En
| MEDLINE
| ID: mdl-23121943
ABSTRACT
The thermal expansion behavior of hydrate paramylon between 100 and 300K has been investigated using synchrotron X-ray powder diffraction. The X-ray diffraction profile at 300K showed a typical pattern of the hydrate triple helical (1â3)-ß-d-glucan with a hexagonal unit cell (a=15.782Å and c=18.580Å). On cooling, the hydrate paramylon had converted to a "low-temperature phase" around 270K. On passing through the phase transition, the a-axis and c-axis values decreased and increased, respectively, and the low-temperature phase at 100K exhibited a hexagonal unit cell (a=15.586Å and c=18.619Å). The phase transition took place reversibly. Below the transition point, both the a-axis and c-axis values decreased linearly. The thermal expansion coefficients are α(a)=1.50×10(-5)K(-1), α(c)=0.33×10(-5)K(-1), and ß=3.08×10(-5)K(-1).
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1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Glucanos
Idioma:
En
Revista:
Carbohydr Polym
Año:
2013
Tipo del documento:
Article
País de afiliación:
Japón