Reconfigurable Transitions between One- and Two-Dimensional Structures with Bifunctional DNA-Coated Janus Colloids

Area of Science:

• Colloidal science
• Materials science
• Nanotechnology

Background:

• DNA coatings offer versatile control over colloidal self-assembly.
• DNA strand displacement enables phase transitions between 3D crystal structures.

Purpose of the Study:

• To demonstrate reconfigurable, thermally reversible transitions between 1D and 2D colloidal structures using DNA-coated Janus particles.
• To introduce a system where Janus particles switch assembly behavior based on temperature.

Main Methods:

• Utilizing bifunctional colloidal Janus particles coated with different self-complementary DNA strands on each face.
• Employing toehold strand displacement to selectively activate/deactivate DNA sticky ends on the smaller face of Janus particles.
• Controlling assembly through either the smaller or larger face by modulating DNA interactions with temperature.

Main Results:

• Achieved reversible switching of Janus particle Janus balance in response to temperature.
• Demonstrated reconfiguration between colloidal chains (1D) and bilayers (2D) based on thermal cues.
• Successfully controlled selective assembly via different particle faces.

Conclusions:

• DNA-coated Janus particles offer a novel strategy for creating reconfigurable colloidal materials.
• This approach allows for dynamic structural transitions in response to environmental stimuli.
• The method holds potential for constructing complex, adaptable systems for various applications.