Reaction #833545

Reaction equation

sodium oleate

→

oleic acid

Solvents

water

Conditions

Workup

1. 1
   Filtrationthe resulting insoluble matter was collected by filtration
2. 2
   Washwashed twice with distilled water

Procedure

In a 1 L flask, 83.4 g of ferrous sulfate (heptahydrate) and 10.4 g of sodium nitrite were thoroughly mixed with 500 ml of distilled water, followed by 20 minutes of stirring at 40° C. Thereafter, 125 ml of concentrated ammonia was added thereto and insoluble matter was collected and washed twice with distilled water to obtain magnetite. The resulting magnetite was added to 500 ml of distilled water in a 1 L flask and the temperature of the solution was raised to 80° C. Then, 7.5 g of sodium oleate was added thereto, followed by 20 minutes of stirring at the same temperature. Thereafter, pH of the solution was adjusted to 5.5 and the resulting insoluble matter was collected by filtration and washed twice with distilled water to obtain magnetite having an oleic acid layer. The magnetite was again added into a 1 L flask, 500 ml of distilled water was added, and the temperature of the solution was raised to 70° C. Then, 7.5 g of sodium dodecylbenzenesulfonate was added thereto and the whole was stirred overnight to obtain magnetic fine particles. Using the magnetic fine particles, the magnetic fine particles of the invention to which a UCST polymer was immobilized were prepared according to the following method.

Source