Chemical and Materials Engineering Vol. 1(3), pp. 78 - 84
DOI: 10.13189/cme.2013.010303
Reprint (PDF) (386Kb)


Phase Transitions in Some Phase Changing Organic Materials Studied by Nuclear Magnetic Resonance Relaxometry


Kashaev R.S.-H.1,*, A.G.N. Masiab2,*
1 Каzan State Power Engineering University, 420107, Kazan, Esperanto
2 Каzan State Power Engineering University,420107, Kazan, Esperanto

ABSTRACT

Using nuclear magnetic resonance relaxometry and calorimetry methods were studied phase transitions in isoparaffin i-C22H46 and paraffin added bitumen. They can be used as a phase-changing materials (PCM) and so as heat accumulating/emitting thermal electric energy storage. For studies of phase transitions time and temperature dependences on protons was used relaxometer NMR 09/PC on resonance frequency υ0 = 9,2 МΓц. Were received data on structure-dynamical NMR-parameters, determining properties of studied organic materials. Was discovered prolonged complex form of phase transition through many stage crystallization process, which does not satisfy the criteria of phase transitions of I or II order.

KEYWORDS
Nuclear Magnetic Resonance, Phase Transitions, Phase Transition Materials

Cite this paper
Kashaev R.S.-H. , A.G.N. Masiab (2013). Phase Transitions in Some Phase Changing Organic Materials Studied by Nuclear Magnetic Resonance Relaxometry. Chemical and Materials Engineering, 1 , 78 - 84. doi: 10.13189/cme.2013.010303.