Room temperature magnetic materials from nanostructured diblock copolymers

Abstract

nanostructured magnetic materials are important for many advanced applications. Consequently, new methods for their fabrication are critical. However, coupling self-assembly to the generation of magnetic materials in a simple, straight-forward manner has remained elusive. Although several approaches have been considered, most have multiple processing steps, thus diminishing their use of self-assembly to influence magnetic properties. Here we develop novel block copolymers that are preprogrammed with the necessary chemical information to microphase separate and deliver room temperature ferromagnetic properties following a simple heat treatment. The importance of the nanostructured confinement is demonstrated by comparison with the parent homopolymer, which provides only paramagnetic materials, even though it is chemically identical and has a higher loading of the magnetic precursor. In addition to the room temperature ferromagnetic properties originating from the block copolymer, the in situ generation densely functionalizes the surface of the magnetic elements, rendering them oxidatively stable.

Improving information density in ferroelectric polymer films by using nanoimprinted gratings

“…2 (0.01 bit/nm 2 ) by using a line based nanostructured P(VDF-TrFE) film. This information density compares well with that recently reported 36,37 for organic-based magnetic structures. Thus, our proposal could be of interest towards the miniaturization of all-organic storage devices.…”

Synthesis and Solid-State Pyrolysis Behavior of POSS Containing Organometallic Polymer with Dicobalt Hexacarbonyl in the Side Chain

“…Especially, through the pyrolysis process, organometallic polymers can be easily pyrolyzed to produce magnetic ceramics [20]. There are various polymerization reactions used to prepare organometallic polymers, and much excellent work had focused on transforming organometallic precursors to functional magnetic materials [21][22][23][24][25][26][27][28][29][30][31].…”

PEG-Polypeptide Dual Brush Block Copolymers: Synthesis and Application in Nanoparticle Surface PEGylation

“…1 Numerous well-organized structures have been developed, 2 some of which have been widely adopted for drug delivery and controlled release applications. 3 Block copolymers bearing more complex segments than linear polymers (e.g., dendritic, 4 brush 5 and cyclic polymers 6 ), however, are not as actively reported due in part to their relatively challenging synthesis.…”