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Photopyroelectric observation of melting in valeric (C5 : 0), linoleic (C18 : 2), linolenic (C18 : 3) and tricosanoic (C23 : 0) free fatty acids
Author(s) -
Dadarlat Dorin,
Bicanic Dane,
Gibkes Jurgen,
Surducan Vasile,
Pasca Aurel
Publication year - 1998
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/(sici)1097-0010(199810)78:2<182::aid-jsfa101>3.0.co;2-b
Subject(s) - thermal diffusivity , volume (thermodynamics) , chemistry , thermal effusivity , melting point , thermal conductivity , atmospheric temperature range , thermodynamics , thermal , analytical chemistry (journal) , materials science , organic chemistry , composite material , thermal resistance , physics , thermal contact conductance
Photopyroelectric (PPE) study of some saturated (C5 : 0, and C23 : 0) and unsaturated (C18 : 2 and C18 : 3) free fatty acids was performed in a temperature range that included their melting points. The standard PPE configuration was used consistently during the experiment; the special PPE case requests thermally thick sample and sensor and optically opaque sample. For those fatty acids for which literature data on volume‐specific heat were available (C18 : 2, C18 : 3), the behaviour around the melting point of all static and dynamic thermal parameters (specific heat, thermal conductivity, diffusivity and effusivity) was obtained. Since no data for volume‐specific heat of C5 : 0 and C23 : 0 were found in the literature, only the temperature behaviour of the thermal diffusivity was obtained for these specimens. © 1998 Society of Chemical Industry