Targeted cargo delivery using a rotating nickel nanowire.

Area of Science:

• Nanotechnology
• Biophysics
• Microfluidics

Background:

• Developing advanced tools for micro-scale manipulation is crucial for biological and materials science research.
• Current methods for handling microscopic objects often face limitations in precision and applicability.

Purpose of the Study:

• To introduce a novel method for noncontact and contact manipulation of micro-objects using rotating magnetic nanowires.
• To demonstrate the capability of these nanowires for targeted delivery of biological samples.

Main Methods:

• Utilizing rotating nickel nanowires actuated by an external rotating magnetic field.
• Employing Finite Element Method (FEM) simulations to analyze fluid flow induced by nanowire rotation.
• Conducting experiments on a solid surface to manipulate polystyrene microbeads and biological samples.

Main Results:

• Demonstrated noncontact manipulation (pushing, pulling, rotation) of individual polystyrene microbeads.
• Successfully performed targeted delivery of biological samples, including flagellated microorganisms and human blood cells.
• FEM simulations confirmed fluid flow generation around rotating nanowires, enabling manipulation.

Conclusions:

• Rotating magnetic nanowires provide an effective platform for precise manipulation of cellular and subcellular objects.
• This technology shows significant potential for applications in single-cell analysis and micro-scale biological studies.
• The method is well-suited for low-Reynolds-number aqueous environments.