Rapid control of phase growth by nanoparticles

Area of Science:

• Materials Science
• Nanotechnology
• Physical Chemistry

Background:

• Controlling phase growth under harsh conditions (high temperature, high conductivity, high growth rate) is challenging, as surfactants often fail.
• Existing methods struggle to refine microstructures when phase growth is rapid during cooling.

Purpose of the Study:

• To develop a general approach for rapid control of diffusional growth using nanoparticle self-assembly.
• To overcome the limitations of surfactants in controlling phase growth under demanding conditions.

Main Methods:

• Utilizing nanoparticle self-assembly on the fast-growing phase during cooling.
• Observing spontaneous nanoparticle assembly into a thin coating within milliseconds after phase nucleation.
• Demonstrating the approach in inorganic (immiscible and eutectic alloys) and organic materials.

Main Results:

• Achieved uniformly dispersed phases orders of magnitude smaller than those without nanoparticles.
• Successfully controlled rapid diffusional growth, overcoming limitations of fast phase growth during cooling.
• Showcased the effectiveness across diverse material types, including alloys and organic compounds.

Conclusions:

• Nanoparticle self-assembly offers a general and effective strategy for microstructure refinement.
• This approach overcomes inherent limitations of surfactants for growth control in materials processing.
• The method holds broad applicability due to the availability of various nanoparticles.