Particle sizing of magnetite-based magnetic fluid using atomic force microscopy: A comparative study with electron microscopy and birefringence

Lacava, B. M.; Lacava, B.M.; Azevedo, R. B.; Azevedo, R.B.; Silva, L. P.; Silva, L.P.; Lacava, Z. G. M.; Lacava, Z.G.M.; Neto, K. Skeff; Neto, K. Sheff; Buske, N.; Bakuzis, A. F.; Bakuzis, A.F.; Morais, P. C.; Morais, P.C.
September 2000
Applied Physics Letters;9/18/2000, Vol. 77 Issue 12
Academic Journal
Atomic force microscopy (AFM), transmission electron microscopy (TEM), and static magnetic birefringence (SMB) were used to unfold the particle size polydispersity profile of a magnetite-based magnetic fluid sample. The data obtained from different techniques were curve fitted using the lognormal distribution function, from which the mean particle diameter (D[sub m]) and the standard deviation (σ) were obtained. In comparison to the TEM data, the AFM data show a reduction of D[sub m] (about 20%) and an increase of σ (about 15%). In contrast, close agreement between the TEM and SMB data was found. © 2000 American Institute of Physics.


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