Can a diathermic wall be created that allow heat to flow through in one direction only?

A diathermic wall, by definition, allows heat to flow freely in both directions. However, creating a wall that permits heat to flow predominantly in one direction would require advanced materials or mechanisms, such as thermal diodes, which exploit asymmetrical thermal conductance. These materials can facilitate unidirectional heat transfer by utilizing principles similar to those found in electrical diodes. Current research is ongoing in this area, but practical applications are still limited.