Template-Controlled Synthesis of Superparamagnetic Goethite within Macroporous Polymeric Microspheres

Fabrication of Silica Nanoparticles with Both Efficient Fluorescence and Strong Magnetization and Exploration of Their Biological Applications

“…[27][28][29][30] Many research groups have incorporated magnetic nanoclusters into the nanoparticles but the magnetizations of the clusters are commonly low, which greatly limit the scope of their potential applications. [31][32][33][34] We have worked on the development of luminescent materials with effi cient light emissions in the solid state and observed a novel phenomenon of aggregation-induced emission (AIE): a group of nonemissive, propeller-like molecules are induced to emit effi ciently by aggregate formation. [35][36][37][38][39] The AIE effect can boost the fl uorescence quantum yields ( Φ F 's) of the molecules by up to two orders of magnitude.…”

Superparamagnetic Hybrid Nanocylinders

“…Polymer±nanoparticle hybrid materials combine the promising properties of both components. So far, nanoparticles have been synthesized in various polymers, such as resins, [16] membranes, [17] block-copolymer films, [18] micelles, [19,20] gel particles, [21,22] polymeric nanospheres [23] and nanotubes, [24] and dendrimers. [25] In particular, single-molecular templates are of interest since isolated nanocomposites can be synthesized and used directly.…”

“…This method results in the formation of wire-like assemblies of ultrafine magnetic nanoparticles within single cylindrical polymer molecules. The alkaline oxidation of ferrous ions has been demonstrated to yield superparamagnetic forms of maghemite (c-Fe 2 O 3 ) [16,22,23] or sometimes iron hydroxyoxides (such as goethite, a-FeO(OH) [21] ) in a variety of polymeric templates. It is often stated that functionalized polymeric templates can control the chemical composition of products of the alkaline oxidation of ferrous ions.…”

Preparation and properties of magnetic polystyrene microspheres

“…Another pathway of obtaining magnetic composites is the in situ precipitation of magnetic particles in the presence of polymer. Winnik et al 15 obtained superparamagnetic composite particles by in situ precipitation of magnetic oxides within the porous network of preformed sulfonated macroporous poly-(divinylbenzene) microspheres. To achieve the encapsulation of inorganic particles, other suitable methods have been developed, including conventional suspension dispersion and emulsion polymerization in the presence of magnetic nanoparticles.…”