Mobility of Hematite Submicron Particles in Water Solutions of Sugar

Abstract

The mobility of the 100 nm Fe 2 O 3 particles in dense water solutions of sugar (sucrose) was determined from the analysis of the resonance absorption line shape of the Mössbauer spectra recorded in the −5• C to 40• C temperature range for different sugar concentrations. The discrepancy between the experimental data and the prediction of the classical theory of Brownian movement are interpreted in the term of the short observation time and the interaction between the solid particles in fluids, which extends in water up to 300 nm. The sedimentation process in the studied colloids was observed.

Properties of iron nanoparticles sealed in protective media

“…It was found in agglomerated NiO nanoparticles [5] and in composites containing antiferromagnetic nanoparticles of different materials [6]. The shape of the room temperature spectrum of the sample A is very similar to some of that shown in [2,3]. However there is an objection against explanation of the present results in frame of Brownian motion model.…”

“…Recently Stanek et al [2][3][4] used Mössbauer spectroscopy as a tool for the determination of the microscopic movements of nanoparticles in various media. They mixed 100 nm hematite particles in various substances such as soft gels, foams, sugar solution, etc., and measured Mössbauer spectra of these samples.…”

Microstructure and Dynamics of Magnetic Iron Nanoparticles Aggregates in Protein Gels

“…The thickness of such layer may be in the range of 100 nm [13]. The concept of hydrodynamical radius explains the surprising fact that in the needles the mobility of nanoparticles is only reduced by about 50% and is not fully eliminated as in pellet.…”

“…The mobility of nonmagnetic, Fe 2 O 3 , nanoparticles in various media has been studied by us previously [13][14][15]. In this paper the formation of the aggregates of about 60 nm magnetic metallic Fe nanoparticles in gelatine is described.…”

Brownian Movement of Inorganic Nanoparticles in Sediments

“…Moreover, it is possible to observe different localizations of the nanoobjects [6], characterized by the local viscosity. The studied specimens may be quite dense [7] and the optical transparency is not required [8].…”