Block copolymer-nanodiamond coassembly in solution: towards multifunctional hybrid materials

Area of Science:

• Materials Science
• Polymer Science
• Nanotechnology

Background:

• Polymer-nanodiamond (ND) composites offer multifunctional properties by combining polymer flexibility with NDs' unique characteristics.
• A key challenge is achieving homogeneous ND distribution within polymer matrices, hindering composite development.

Purpose of the Study:

• To develop a method for homogeneous distribution of nanodiamonds (NDs) in polymer composites.
• To exploit colloidal coassembly between block copolymers (BCPs) and NDs to control ND spatial distribution and prevent agglomeration.

Main Methods:

• Air oxidation of NDs to create stable dispersions in dimethylacetamide (DMAc).
• Colloidal coassembly of poly(isoprene-b-styrene-b-2-vinyl pyridine) (ISV) block copolymers with NDs in DMAc to form hybrid micelles.
• Fabrication of nanocomposite films and investigation of nanostructure formation using techniques like transmission electron microscopy and dynamic light scattering.

Main Results:

• Achieved uniform sub-50 nm ND distribution in nanocomposite films at ND loadings exceeding 50 wt%, a novel outcome.
• The resulting films exhibited good transparency, enhanced UV-absorption, and improved hydrophilicity compared to neat ISV.
• A network-like superstructure with aligned ND strings was formed at 22 wt% ND loading using a dialysis method.

Conclusions:

• Colloidal coassembly of BCPs and NDs provides a foundation for creating hierarchically ordered nanocomposites.
• The developed method enables precise control over ND spatial distribution, paving the way for advanced hybrid materials.
• These nanocomposites hold potential for applications ranging from biotechnology to quantum devices.