On the thermal stability of Fe2Mn0.5Zn0.5(C2O4)4 |
| |
| Authors: | T. Coseac Silvia Bocai Maria Brezeanu E. Segal |
| |
| Affiliation: | 1. Chair of Physical Chemistry and Electrochemical Technology, Faculty of Chemical Engineering, Poly technical Institute of Bucharest, Bulevardul Republicii 13, BucharestRomania;2. Chair of Inorganic Chemistry and Technology, Faculty of Chemical Technology, Polytechnical Institute of Bucharest, str. Dumbrava Ro?ie 23, BucharestRomania |
| |
| Abstract: | Heat of immersion and contact angle were measured for α-Si3N4. The electrostatic field strength, which was determined to be 0.42×105 esu cm?2, showed that the surface is much less polar than those of oxides. Slight increase of the heat of immersion in water with the increase of outgassing temperature is attributable to the rehydration of siloxane linkages which have been formed by dehydration of silanol groups on the surface. The heat of immersion in n-alkanes increased steeply with the number of carbon, n, from n=6 to 9, and became nearly constant for n>9, while in n-alkanols the heat began to rise at n=10 after the nearly constant values for n=4 to 8. The dispersion force contribution to the total surface free energy, γds, were estimated by contact angle and heat of immersion methods which have been well applied to the low energy surfaces, and found to be 25 mJ m?2 from contact angle and 129 mJ m?2 from the immersional heat in hexane. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
