Inkjet printing-based fabrication of microscale 3D ice structures

Area of Science:

• Materials Science
• Microfabrication
• Crystallography

Background:

• Fabricating 3D microstructures often requires support materials, limiting design complexity and material compatibility.
• Controlling ice crystal growth is challenging due to its sensitivity to environmental conditions.

Purpose of the Study:

• To propose and demonstrate a novel method for fabricating free-standing 3D ice microstructures.
• To investigate the control over ice crystal growth direction during additive manufacturing.

Main Methods:

• Utilized an inkjet printing process with picoliter-volume water droplets.
• Performed fabrication in a low-humidity environment to control ice crystal growth.
• Precisely controlled substrate temperature, ejection frequency, and droplet size.

Main Results:

• Successfully fabricated 3D ice microstructures up to 2000 µm in height without supporting materials.
• Demonstrated high degrees of freedom in structure creation by controlling droplet landing points.
• Achieved precise control over ice crystal growth direction.

Conclusions:

• The proposed inkjet printing method offers a versatile platform for creating complex, unsupported 3D ice microstructures.
• This technique opens new possibilities for applications in fields requiring custom ice structures, such as cryo-biology and microfluidics.