|
Official thesis title: Synthesis, structure and study the properties of cobanlt ferrite and nikel ferrite nano particles
1. Full name: Vu Dinh Ngo
2. Sex: Male
3. Date of birth: 28/8/1966
4. Place of birth: Vinh Phuc
5. Admission decision number: 150/SĐH, Dated: 06/7/2005, Vietnam National University, Ha Noi.
6. Changes in academic process: 1129/SĐH Decision, Dated 20/06/2008 from the University of Natural Sciences - Vietnam National University, Ha Noi has allowed 12 months to renew on 06/7/2009; 2788/QD-SDH Decision, Dated 12/8/2009 from Vietnam National University, Ha Noi has been suspended for studying reasons, work on 01/7/2010; Doccument No 66/DT-TS, Dated 30/07/2010 has allowed further study programs.
7. Official thesis title: Synthesis, structure and study the properties of cobanlt ferrite and nikel ferrite nano particles
8. Major: Chemistry of Inorganic
9. Code: 62.44.25.01
10. Supervisors:
- Asso.Prof. Dr. Ngo Sy Luong
- Prof. Dr. Phan Van Tuong
11. Summary of the new findings of the thesis
- Successfully synthesizing the nano ferrite: CoFe2O4 and NiFe2O4, single phase crystal structure spinel with the average particle size of 13-18 nm, with good magnetism, a characteristic of single domain. The ferrite nano can be applied to magnetic liquid production and some other products used in modern technology.
- Making a systematic survey of factors affecting the experimental process and the size of ferrite nanoparticles, such as pH, metal cation concentration, temperature and stirring duration, the amount of used solvent, the calcination temperature, calcination duration ... Finding the optimal conditions for the process of materials synthesis.
- The nanocomposite CoFe2O4/SiO2 and NiFe2O4/SiO2 was synthesized by the with the nanoparticles CoFe2O4 and NiFe2O4 (10-13 nm) dispersed in the amorphous SiO2, making a survey of factors affecting the experimental process and the nanocomposite characteristics: pH, the calcination temperature, calcination duration, the proportion of crystalline phase in the nanocomposite, from which the processes of synthesizing materials is produced.
- The relationship between crystal structure, the size of particles nano ferrite CoFe2O4 and NiFe2O4 and their magnetic characteristics was identified, and the relation between crystal size, the content of crystal phase nano ferrite with special magnetism of the nanocomposite: CoFe2O4/SiO2 and NiFe2O4/SiO2 was determined as well.
More detail
|
