Lei Liu, Zhao-Feng Chen, Hai-Bo Wei, Yang Li, Yu-Chuan Fu, Hong Xu, Jin-Ping Li, Alexandra M Z Slawin, Jin-Xiang Dong
Research Institute of Special Chemicals, Taiyuan University of Technology, Taiyuan 030024, Shanxi, People's Republic of China.
Inorganic chemistry 2010 Sep 20In an attempt to synthesize novel zirconium phosphate materials, a series of syntheses have been performed in a deep eutectic solvent (DES), composed of tetrapropylammonium bromide (TPABr) and oxalic acid. As a result, this DES does not act as a template provider in reaction probably owing to the steric effects of the longer chains of the TPA cation, and only the α-Zr(HPO(4))(2)·H(2)O (α-ZrP) phase has been achieved. However, after organic amine was added to the initial reaction mixture in a normal way, the additives did act as a template to induce the zirconium phosphate framework. For example, with 1,4-dimethylpiperazine as an additive, a novel layered compound, [C(6)H(16)N(2)](0.5)Zr(H(0.5)PO(4))(2)·H(2)O (denoted as ZrPO(4)-DES8) was obtained. Its structure was determined from single-crystal X-ray diffraction (XRD) data and consists of zirconium phosphate layers with the protonated 1,4-dimethylpiperazine and water molecules in between. Interestingly, the two layered materials as additives in a liquid lubricant exhibit excellent friction behavior with higher load-carrying and antiwear capacities in comparison to typical lubricant additives such as MoS(2) and graphite, increase the P(B) value of the base oil by 27.2% and 8.5%, and decrease the wear scar diameter of the base oil by 43% and 36%, respectively. Scanning electron microscopy, XRD, and energy-dispersive X-ray spectrometry are used to investigate the lubricant behavior of those materials.
Lei Liu, Zhao-Feng Chen, Hai-Bo Wei, Yang Li, Yu-Chuan Fu, Hong Xu, Jin-Ping Li, Alexandra M Z Slawin, Jin-Xiang Dong. Ionothermal synthesis of layered zirconium phosphates and their tribological properties in mineral oil. Inorganic chemistry. 2010 Sep 20;49(18):8270-5
PMID: 20718431
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