From: Robert Lynn
* 4µm powder has about 0.4m²/gram of surface area, Not necessarily the right comparison number to use here. Raney nickel, for instance, can arrive in 40 µm particles, before it is activated. After activation by leaching with lye, it is completely porous with a minimum of 10,000 times more internal surface area than the external area. Note: Raney nickel is a trademark of WR Grace & Co. When someone claims not to use it, this does not mean that they do not use a functional equivalent. There are at least two dozen companies in China alone exporting the equivalent kind of nickel aluminum-alloy (not activated) as Raney, and although they may call it Raney they are not supposed to use that trademarked name. Jones
