I'm not convinced that copper foam is a good idea for a heat sink, but this article doesn't give enough detail to convince me that it's a bad idea either. The

I'm not convinced that copper foam is a good idea for a heat sink, but this article doesn't give enough detail to convince me that it's a bad idea either. The radiative emissivity might be a bit of a red herring, since heat sinks typically rely more on conduction and convection than on radiation for cooling. So then it comes down to some hand waving about boundary layers.