Preparation of nanometer copper borate with supercritical carbon dioxide drying

Nanotechnology and supercritical fluids

“…RESOLV configuration has been demonstrated to be more effective in producing nanoparticles, since the liquid that receives the expanding jet, can suppress the particle growth [42]. The addition of a stabilizing agent in the liquid also protects particles from agglomeration.…”

“…Unfortunately, many solid compounds with high molecular weight and polar bonds, that could be candidate to nanoparticles generation, show a very low or negligible solubility in SC-CO 2 , that is the most widely SCF used and show a reduced solubility in many other compounds that could be good candidates to act as SCF. RESOLV has also the problem of the recovery of particles from the liquid solution used to improve the process performance: in this configuration, the process is no more solventless [40][41][42][43]. Turk et al [9] used the RESS process to produce -sitosterol (an anticholesteremic) nanoparticles of about 200 nm mean diameter.…”

“…The formation of the liquid mixture is very fast due to the enhanced mass transfer rates that characterize supercritical fluids and, as a result, nanoparticles could be produced (Fig. 2) [11,[36][37][38][39][40][41][42][43][44].…”

Preparation and Characterization of Copper Borates as Lubricant Additives

“…The materials showing antiwear and extreme pressure functions and used for the modification of the surfaces in the lubricating oils can be borate based material [1]. Copper borate has been the focus of much attention, as it possesses a good combination of properties, such as environmentally friendly lubrication, wood preservation, and fire retardancy.…”

“…Hu et al [1], Zheng et al [2] and Shvartz and Boleuseva [4,5] [4] were reported by mixing aqueous solutions of copper salts and borax decahydrate.…”