Magnetic cobalt dispersions in poly(dimethylsiloxane) fluids

SEEDLING Proposal to Establish Pilot Data for a Consortium on Magnetic Nanoparticle Assemblies: A New Tool for Drug Delivery, Sensors and Electronic Devices

“…Both our work [2][3][4] and the work of others [5,6] have demonstrated that 10-15 nm diameter cobalt particles can be prepared by thermolyzing dicobalt octacarbonyl in the presence of select block copolymers. The block copolymer dispersion stabilizers should have "anchor" blocks with coordinating groups for the cobalt surfaces, and "tail" blocks to extend into the reaction media (toluene in this case).…”

Design Considerations for Magnetically Actuated Biomimetic Cilia

“…To achieve homogeneity at the micron scale, great care must be taken to ensure the colloidal stability of the nanoparticles. Such stability may be achieved through the use of surfactants (Evans et al, 2007) or by strong adsorption of a hydrophobic chemical species on the surface of the particle (Mefford et al, 2008;Rutnakornpituk et al, 2002;Stevenson et al, 2001;Wilson, Goff, Riffle, Harris, & St Pierre, 2005). A description of the preparation of the former follows.…”

Hybrid metal–polymer composites from functional block copolymers

“…81 Polysiloxane block copolymers with nitrilefunctional blocks 82 and carboxylate-functional polyurethane blocks 83 were used by Riffle and coworkers to stabilize magnetic nanoparticles for applications including the treatment of retinal detachment. 84 An interesting and highly practical approach to thin films of hybrid materials was described by Horiuchi et al, 67 in which phase-segregated block copolymers [either PSblock-PMMA or polystyrene-block-poly(hydroxylated isoprene)] are exposed to vapors of a Pd complex with selective absorption and reduction to nanoparticles of metal species within discrete Scheme 2 HIGHLIGHT domains of the copolymer film. Several other studies have demonstrated the effective and selective incorporation of metals into the PMMA domains of PS-PMMA block copolymers.…”