Structure of the cobalt drier complex

Abstract

Cobalt octoate (2‐ethyl hexoate) has been studied by a wide range of spectroscopic and physical techniques and found to be polymeric. A structure for the compound is proposed. Its activity as a drier in a surface coating medium is shown to be related to its polymeric state and to the coordinating effect of other components present in the system. Auxiliary metals such as calcium or lead enhance the activity by providing a strong ligand field around the cobalt, facilitating the transition from the cobaltous to cobaltic state. Other metals such as zinc or tin, or polyols reduce the activity by coordination to configurations unfavourable to this change.

The compression creep behaviour of silicon nitride ceramics

“…Interest in high-performance gas turbines for transportation [1] and power generation [2,3] has led to increasing attention being devoted to the development and study of silicon nitride ceramics. Intricate components can be fabricated by producing silicon powder compacts of the shape required, then nitriding at ~1650K.…”