Highly accurate photopyroelectric measurement of thermal diffusivity of vegetable oils
| Autor: | M. Streza, Carmen Socaciu, Constantin Bele, D. Dadarlat, C. Neamtu, Francisc Vasile Dulf |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
chemistry.chemical_classification
food.ingredient Chemistry Sunflower oil Analytical chemistry General Chemistry Hemp oil Thermal diffusivity Industrial and Manufacturing Engineering Vegetable oil food Thermal Gas chromatography Chemical composition Food Science Biotechnology Polyunsaturated fatty acid |
| Zdroj: | European Journal of Lipid Science and Technology. 111:148-154 |
| ISSN: | 1438-9312 1438-7697 |
| Popis: | High-accuracy photopyroelectric measurements, in the thermal-wave-resonator-cavity configuration, were performed in order to measure the thermal diffusivity of some vegetable oils. The high resolution (relative error ±0.5%) of the above method allows for the detection of small changes in the values of this dynamic thermal parameter. The accuracy of the results is mainly due to the possibility to precisely control the variation (30-nm step) of sample thickness, a proper selection of the range of the thickness scan (2 μ m < L m < 4 μ m ∼ 5 μ m ), and an iterative procedure of data analysis. A correlation between thermal diffusivity and the fatty acid composition (obtained via gas chromatography) is suggested for some fresh (sunflower, hemp, flax, and soybean) oils and for hemp oil exposed to a microwave field: Thermal diffusivity appears to be determined by the overall content of polyunsaturated fatty acids. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text