2.1 Chemicals
Ferric chloride hexahydrate (FeCl3·6H2O), trimesic acid (BTC), methanol, sodium dodecyl sulfate (SDS), oleic acid, petroleum ether were analytic reagents without purification further. The crude oil with a density of 0.77 g·cm3and a viscosity of 13.9 mN·s·m-1 at 20 ℃ was obtained from an oilfield at Tarim Basin, China.