Magnetite colloidal

Baumgartner, E. (1985) Dissolution of colloidal magnetite by organic acids in the presence of polyelectrolytes. Colloids Surfaces Conf., June 1985... 

Crystallization of ferric hydroxide into spinel by adsorption onto colloidal magnetite. 

Missana, T., M. Garcia-Gutierrez, and V. Fernandez. 2003. llranium(VI) sorption on colloidal magnetite under anoxic environment Experimental study and surface compl-exation modelling. Geochim. Cosmochim. Acta 67 2543-2550. 

Magnetic photocatalysts were synthesized by coating titanium dioxide particles onto colloidal magnetite and nanomagnetite particles [197], The photoactivity of the prepared coated particles was lower than that of single-phase Ti02 and was found to decrease with an increase in the heat treatment. These observations were explained in terms of an unfavorable heterojunction between the titanium dioxide and the iron oxide core, leading to an increase in electron-hole recombination. 

Kinetics of Formation, Magnetic Moment, and Stability of Colloidal Magnetite... 

Figure 23 TEM picture of colloidal magnetite particles obtained as described in 134.

Figure 6 Stereo pairs of maximum intensity projection bright blood MR angiograms acquired from rat brain (A) and abdomen (B). Contrast between flowing and static fluid was enhanced in (B) by administration of a colloidal magnetite contrast reagent which shortens T2 and T2 of blood relative to static tissue. The 3D effect can be best appreciated by viewing the images through stereo viewing...

Therefore, during hydration of an oxide in aqueous medium, the slow evolution of the PZC can be ascribed to the contribution of ions (and/or metal ions) from the network. The transfer of must probably occur if the surface charge is the result of adsorption/desorption equilibria of hydroxylated complexes [4.1]. It is also involved in the behavior of colloidal magnetite Fe304 in a weakly acidic medium which gives rise to the desorption of Fe " from the lattice [42] (see Section 9.1.3). 

If ferric ions are precipitated at pH 8 in the presence of colloidal magnetite, a ferric gel forms immediately, Gel particles are physisorbed on the magnetite and are identified in Mossbauer spectroscopy by a quadrupolar doublet superimposed on two sextuplets of magnetite due to Fe + and respectively [36]. During ageing... 

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