Critical behavior of thermal phase transitions of iota-carrageenan in CaCl2 solution
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CitationÖzbek, H. & Pekcan, M. Ö. (2006). Critical behavior of thermal phase transitions of iota-carrageenan in CaCl2 solution. Physica A: Statistical Mechanics and its Applications, 367, 69-78. doi:10.1016/j.physa.2005.09.073
In situ photon transmission method was applied to study thermal phase transitions of ?-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 ?-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.
SourcePhysica A: Statistical Mechanics and its Applications
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