Spontaneous Graphene/Lipid Bicellar Co-assembly (NANO²-Graphene): Experiments and Computer Simulations.

Area of Science:

• Biomaterials Science
• Nanotechnology
• Computational Chemistry

Background:

• Lipid self-assembly is crucial for biological membranes and nanomaterial design.
• Graphene's unique properties offer potential in biomedical applications.
• Understanding graphene-lipid interactions is key for developing advanced nanomaterials.

Purpose of the Study:

• To investigate the self-assembly of graphene with discoidal lipid bicelles.
• To characterize the resulting graphene-incorporated nanodisc structures.
• To elucidate the effects of graphene on lipid behavior and bicelle stability.

Main Methods:

• Combined experimental techniques: dynamic light scattering (DLS), differential scanning calorimetry (DSC), and small-angle X-ray scattering (SAXS).
• Computer modeling: molecular dynamics (MD) simulations.
• Varying graphene-to-lipid ratios to assess self-assembly behavior.

Main Results:

• Formation of stable graphene-incorporated nanodiscs (NANO²-graphene) over a wide range of ratios.
• Graphene enhances bicelle stability, preventing thermal transitions.
• Graphene suppresses lipid order, reduces lateral diffusion, and alters lipid tail orientation and headgroup interactions.

Conclusions:

• Graphene and lipid bicelles form stable NANO²-graphene structures.
• Graphene significantly influences lipid organization and dynamics within nanodiscs.
• Findings provide critical insights for graphene-based nanomaterials in biomedical and biointerface applications.