High accuracy photopyroelectric investigation of dynamic thermal parameters of Fe3O4 and CoFe2O4 magnetic nanofluids

Autor:	Izabell Craciunescu, Ladislau Vekas, C. Neamtu, D. Dadarlat, Rodica Turcu, M. Streza, Doina Bica
Rok vydání:	2008
Předmět:	Mean diameter Materials science Analytical chemistry Nanoparticle Bioengineering General Chemistry Calorimetry Condensed Matter Physics Thermal diffusivity Atomic and Molecular Physics and Optics Nanofluid Modeling and Simulation Phase (matter) Thermal General Materials Science Thermal effusivity
Zdroj:	Journal of Nanoparticle Research. 10:1329-1336
ISSN:	1572-896X 1388-0764
DOI:	10.1007/s11051-008-9386-z
Popis:	The suitability of the photopyroelectric (PPE) calorimetry in measuring the thermal parameters of nanofluids was demonstrated. The main advantages of the method (concerning nanofluids) as compared to classical calorimetric techniques are: high sensitivity and small amount of sample required. The thermal diffusivity and effusivity of some nanofluids based on Fe3O4 and CoFe2O4 type of nanoparticles (mean diameter 6.5 nm) were investigated by using two PPE detection configurations (back and front). In both cases, the information is contained in the phase of the PPE signal. Due to the high accuracy of the results (within ±0.5%) thermal diffusivity was found to be particularly sensitive to changes in relevant parameters of the nanofluid as carrier liquid, type and concentration of nanoparticles.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::57b47ba4abfec74bf8b4cd85a0445bc9 https://doi.org/10.1007/s11051-008-9386-z Zobrazit plný text záznamu Full text from SpringerLink