Magnetic particles, impregnated

Shaibu, B.S. Reddy, M.L.P. Prabhu, D.R. Kanekar, A.S. Manchanda, V.K. N, N -dimethyl-N, N -dibutyl tetradecyl malonamide impregnated magnetic particles for the extraction and separation of radionuclides from nuclear waste streams, Radiochim. Acta 94 (2006) 267-273. 

Shaibu, B. S Reddy, M. L. P Murali, M. S and Manchanda, V. K N,N,N ,N -tetraoctyl-3-oxapentane-l,5-diamide impregnated magnetic particles for the uptake of lanthanides and actinides from nuclear waste streams, Radiochim. Acta, 95, 159-164, 2007. 

Using a similar procedure, smaller magnetic particles (400-700 nm in diameter) were produced by Lindlar et al. [175], Polymer particles of poly(MMA-co-GMA) were first synthesized by surfactant-free emulsion polymerization. Ethylene diamine, was then the added to obtain internal anchor groups able to favor the subsequent impregnation and hydrolysis of iron salts inside the particles. The final composite particles were monodisperse in size and the magnetic loading was close to 25 wt%. 

Synthesis of hydrophilic magnetic particles with an average size of 2.6p.m and PDI 1.02, and a 24.3% iron oxide content was carried out by Ma et al. [101], She used coprecipitafion of iron oxide inside an amino functional polymer matrix. The total process involves three steps (a) preparation of poly(glycidyl methacrylate) (PGMA) seed particles by a dispersion polymerization, (b) functionalization of the seed PGMA particles with ethylene diamine (EDA), and (c) impregnation of iron salts and precipitation with ammonium hydroxide solution inside the functional polymers matrix. 

Anderson et al (125) first used Rh2Co2(CO)i2 impregnated on y-Al203 to prepare a dispersed bimetallic catalyst. They demonstrated that the catalyst gave metal particles (12-28 A in size) having a rather uniform Co/Rh composition (Co/Rh atomic ratio 0.51), as estimated from the magnetic susceptibility X,(Co). 

Char impregnated with magnetic powder Measurement of the flow of dark colored particles Yamaki et al. (1994)... 

In summary, MRI is a powerful technique to see inside a 3D sample and measure velocity and deformation. Materials are generally restricted to liquids or liquid-impregnated solids like seeds, or to special designed particles. Some MRI systems can also image waxes or soft rubber. Almost no metal or magnetic... 

The optimization of Pt-Fe catalysts supported on charcoal was made by means of an empirical method. The carbon support was washed, oxydized in a liquid phase and thermally desorbed before its impregnation. The metals precursors were reduced by hydrogen. The reduced metals were characterized by electron microscopy, magnetization measurements and X Ray diffraction. The two metals are alloyed under the form of finely divided particles. The charcoal supported Pt-Fe catalysts are very active and selective in hydrogenation of cinnamaldehyde to clnnamyl alcohol. 

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