Magnetic nanostickers for active control of interface-enhanced selective bioadhesion

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Nanotechnology

Background:

• Natural tissues possess varied mechanical and surface properties, hindering universal methods for engineering material connections.
• Precise control over interfacial properties like modulus and adhesion on diverse biological tissues faces significant barriers.

Purpose of the Study:

• To propose an interface-enhanced strategy using magnetic nanostickers for controlled bioadhesive properties.
• To demonstrate tunable bioadhesion on various tissues for biomedical applications.

Main Methods:

• Spatial and temporal anchoring of magnetic nanostickers to engineer bioadhesive properties.
• Utilizing remote control to exploit nanosticker interactions for high adhesion energy and fatigue resistance.
• Evaluating biointerface performance on diverse tissues including skin, intestine, liver, and kidney.

Main Results:

• Achieved extremely high adhesion energy (~1250 J/m²) and interfacial fatigue resistance (~50 J/m²) at low nanosticker density (4 μg/mm²).
• Demonstrated comprehensively tunable bioadhesion across multiple tissue types.
• Successfully integrated the biointerface with fragile tissues in vivo for 10 days, showing adaptation and promotion of postoperative recovery.

Conclusions:

• The proposed interface strategy enables controllable bioadhesion on diverse biological tissues.
• Magnetic nanostickers offer a promising methodology for developing advanced biointerfaces in biomedical engineering.
• The developed biointerface adapts to in vivo environments and aids in promoting postoperative recovery.