A few years ago I came across a material used as a high power laser beam dump. It was made from carbon fibre which looked like a mat made of high density bristles ie all the fibres on the top of the mat were vertical. It performed exceptionally well, re-radiating rather than conducting most of the heat away. Anyway, the questions: Are there similar materials in such configurations? And what is that kind of weave called?
I think the material you're thinking of is called Vel-Black and is made by a company called Energy Science Laboratories. As I recall from a NASA Tech Briefs article, it's made from carbon nanotubes and is on a fabric substrate. Good for beam dumps but be careful about exceeding the damage threshold because breathing in the carbon material that is ablated off is bad for your health.