Techniques of controlling hydrodynamic size of ferrofluid of gelatin-coated magnetic iron oxide nanoparticles
- 164 Downloads
In this study, magnetic iron oxide (IOPs) nanoparticles were coated with gelatin B, and various parameters were investigated to find out effects of those parameters in the overall hydrodynamic size of the colloidal dispersions. Two different types of coating techniques, viz., in situ and separately precipitation/coating technique were investigated. In in situ precipitation/coating technique, precipitation, and coating of the IOPs were done simultaneously, while in separately precipitation/coating technique, the IOPs particles were separately precipitated and purified before surface coating was done. The colloidal dispersion obtained from these two methods showed drastically different viscosities as well as hydrodynamic size. It was found that in situ precipitation/coating technique gave smaller-sized monodispersed particles compare to separately precipitation/coating technique. In addition to the above two techniques, the desolvation/cross-linking technique was also investigated and found to, further, reduce the size of the ferrofluid prepared by the in situ and separately precipitation/coating techniques. The ferrofluids prepared using in situ as well as separately precipitation techniques were highly stable and did not sediment for more than 1 month. However, the desolvation/cross-linking technique gave dispersion with reduced stability. Nevertheless, by adjusting suitable combination of acetone and glyceraldehydes, ferrofluid with better stability could be produced by this technique.
KeywordsGelatin Select Area Diffraction Pattern Colloidal Dispersion Hydrodynamic Size Steric Stabilization
This research was supported by the Regional Research Center Program of the Korean Ministry of Education (KRF-2005-211-D00054) and Korean Research Foundation Grant Funded by the Korean Government (MOEHRD) the center for Healthcare Technology Development, Jeonju 561–756, Republic of Korea.
- 1.Gupta AK, Gupta M (2005) Biomaterials 26:3995. doi: https://doi.org/10.1016/j.biomaterials.2004.10.012 CrossRefGoogle Scholar
- 6.Gaihre B, Parajuli DC, Seo HC, Khil MS, Kim HY (2008) Adsorpt Sci Technol (in press).Google Scholar
- 8.Gaihre B, Khil MS, Kang HK, Kim HY (2008) J Mater Sci: Mater Med (in press)Google Scholar
- 14.Loeb J (1924) Proteins and the theory of colloidal behavior. McGraw-Hill, New YorkGoogle Scholar
- 21.Shirad A, Huang Y, Chen H, McQuarrie S, Abrams D, Rao W et al (2006) J Pharm Pharm Sci 9:124Google Scholar
- 22.Alma JK, Gerard HME, Jeroen K, Sebastian AJZ, Jacob D, Jan F (1999) J Biomater Sci Polym Ed 11:225Google Scholar
- 23.Cornell RM, Schwertmann U (2000) The iron oxides. Wiley, Weinheim, GermanyGoogle Scholar