Segregation of Maghemite Nanoparticles within Symmetric Diblock Copolymer and Triblock Terpolymer Patterns under Solvent Vapor Annealing.
George ZapsasDimitrios MoschovasKonstantinos NtetsikasAndreas Karydis-MessinisNikolaos ChalmpesAntonios KouloumpisDimitrios Panagiotis GournisNikolaos E ZafeiropoulosApostolos AvgeropoulosPublished in: Materials (Basel, Switzerland) (2020)
Block copolymers (BCPs), through their self-assembly, provide an excellent guiding platform for precise controlled localization of maghemite nanoparticles (MNPs). Diblock copolymers (di/BCP) represent the most applied matrix to host filler components due to their morphological simplicity. A series of nanocomposites based on diblock copolymer or triblock terpolymer matrices and magnetic nanoparticles were prepared to study and compare the influence of an additional block into the BCP matrix. MNPs were grafted with low molecular weight polystyrene (PS) chains in order to be segregated in a specific phase of the matrix to induce selective localization. After the mixing of the BCPs with 10% w/v PS-g-MNPs, nanocomposite thin films were formed by spin coating. Solvent vapor annealing (SVA) enabled the PS-g-MNPs selective placement within the PS domains of the BCPs, as revealed by atomic force microscopy (AFM). The recorded images have proven that high amounts of functionalized MNPs can be controllably localized within the same block (PS), despite the architecture of the BCPs (AB vs. ABC). The adopted lamellar structure of the "neat" BCP thin films was maintained for MNPs loading approximately up to 10% w/v, while, for higher content, the BCP adopted lamellar morphology is partially disrupted, or even disappears for both AB and ABC architectures.
Keyphrases
- atomic force microscopy
- magnetic nanoparticles
- high speed
- single molecule
- reduced graphene oxide
- ionic liquid
- quantum dots
- deep learning
- optical coherence tomography
- drug release
- mass spectrometry
- machine learning
- carbon nanotubes
- escherichia coli
- cystic fibrosis
- functional connectivity
- density functional theory
- biofilm formation
- highly efficient
- hyaluronic acid
- tandem mass spectrometry
- candida albicans
- molecularly imprinted