How does freeze-casting work?
How does freeze-casting work?
Freeze-casting process An aqueous suspension of particles (a) is placed onto a cold plate; ice crystals propagate in the direction of the temperature gradient, while pushing particles away from the moving freeze front (b).
What is ice casting?
Freeze-casting, also frequently referred to as ice-templating, or freeze alignment, is a technique that exploits the highly anisotropic solidification behavior of a solvent (generally water) in a well-dispersed slurry to controllably template a directionally porous ceramic.
What are the principles of freeze casting?
The principles of freeze casting are applicable to a broad range of combinations of particles and suspension media. Water is by far the most commonly used suspension media, and by freeze drying is readily conducive to the step of sublimation that is necessary for the success of freeze-casting processes.
Why freeze cast carbon nanomaterials?
Unlike aerogel materials produced without ice-templating, freeze cast structures of carbon nanomaterials have the advantage of possessing aligned pores, allowing, for example unparalleled combinations of low density and high conductivity. Freeze casting is unique in its ability to produce aligned pore structures.
What is the best suspension media for freeze casting?
Water is by far the most commonly used suspension media, and by freeze drying is readily conducive to the step of sublimation that is necessary for the success of freeze-casting processes.
What are the benefits of freeze casting for clothes?
The alignment of pores in freeze cast structures also imparts extraordinarily high thermal resistance in the direction perpendicular to the aligned pores. The freeze casting of aligned porous fibres by spinning processes presents a promising method towards the fabrication of high performance insulating clothing articles.