Back to Search
Start Over
Nanospheres Containing Urea: Photothermic Properties
- Source :
- International Journal of Thermophysics. 39
- Publication Year :
- 2018
- Publisher :
- Springer Science and Business Media LLC, 2018.
-
Abstract
- In the present research, nanospheres of chitosan (CS), maltodextrin, and sodium tripolyphosphate (STPP), loaded with urea, were synthesized by using an ionic gelation technique. In the nanosphere synthesis was used a central composite experimental design, obtaining nanospheres with an average size of 275 ± 32 nm and 27.5 mV zeta potential. The nanospheres were characterized by their hydrodynamic diameter, polydispersity index, nitrogen content, and thermal properties such as thermal diffusivity (α), effusivity (e), and conductivity (k); also melting temperature was obtained by differential scanning calorimetry. The thermal properties of nanospheres show that the sample with the smallest size has a thermal diffusivity value of (14.4 ± 0.4) × 10−8 m2·s−1 and a thermal conductivity value of (6.4 ± 0.1) × 10−1 W·m−1·K−1, and the obtained melting temperature was 157 °C. Higher concentrations of CS increase the values of these thermal properties, probably because chitosan interacts ionically with STPP forming a reticular network due to the opposite charges of both molecules.
- Subjects :
- Materials science
Dispersity
02 engineering and technology
Conductivity
010402 general chemistry
021001 nanoscience & nanotechnology
Condensed Matter Physics
Thermal diffusivity
Maltodextrin
01 natural sciences
0104 chemical sciences
chemistry.chemical_compound
Thermal conductivity
Differential scanning calorimetry
Chemical engineering
chemistry
Zeta potential
0210 nano-technology
Thermal effusivity
Subjects
Details
- ISSN :
- 15729567 and 0195928X
- Volume :
- 39
- Database :
- OpenAIRE
- Journal :
- International Journal of Thermophysics
- Accession number :
- edsair.doi...........0b91524f80a91256c80fbc8d9070996e