Scanning probe lithography on fluid lipid membranes

Area of Science:

• Materials Science
• Nanotechnology
• Biophysics

Background:

• Fluid lipid membranes are crucial for biological functions.
• Patterning these membranes at the nanoscale is challenging.
• Existing methods lack precision and control.

Purpose of the Study:

• To develop a novel method for patterning fluid lipid membranes using scanning probe lithography (SPL).
• To demonstrate precise control over membrane placement and composition.
• To create arrays of isolated fluid membrane pixels.

Main Methods:

• Utilized scanning probe lithography (SPL) on a borosilicate substrate.
• Employed pre-patterned metal grids to define membrane pixel boundaries.
• Regulated membrane-probe tip interactions by adjusting solution pH.
• Performed sequential membrane removal and refilling with different lipid compositions.

Main Results:

• Achieved precise spatial control over fluid lipid membrane patterning.
• Demonstrated pH-dependent control for membrane removal and deposition.
• Successfully created 1 x 1 µm lipid bilayer corrals spaced 100 nm apart.
• Constructed arbitrary membrane patterns within the defined grid.

Conclusions:

• Scanning probe lithography offers a versatile platform for nanoscale lipid membrane patterning.
• The developed technique allows for the creation of complex, custom membrane architectures.
• This method has potential applications in biosensing, drug delivery, and fundamental membrane studies.