Critical behavior of thermal phase transitions of iota-carrageenan in CaCl2 solution

Haluk Özbek and Önder Pekcan

Physica A: Statistical Mechanics and its Applications, 2006, vol. 367, issue C, 69-78

Abstract: In situ photon transmission method was applied to study thermal phase transitions of ι-carrageenan in CaCl2 solution. Coil-to-helix (c–h) and helix-to-dimer (h–d) transitions were detected upon cooling. An extra dimer-to-dimer (d–d) transition was observed as well during cooling at low-temperature region. Upon heating only dimer-to-helix (d–h) and helix-to-coil (h–c) transitions were detected. Photon transmission intensity, Itr was monitored against temperature to determine several phase transitions and transition temperatures. It was observed that the c–h transition in ι-carrageenan–CaCl2 system performs a crossover between 3D percolation to classical theory. Upon heating, the specific heat exponent over the d–h transition was extracted from the transmitted intensity data and was found to be 0.045.

Keywords: Carrageenan; Phase transition; Critical exponent; Coil-to-helix transition; Helix-to-dimer transition (search for similar items in EconPapers)
Date: 2006
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:367:y:2006:i:c:p:69-78

DOI: 10.1016/j.physa.2005.09.073

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