(217cn) Stable Suspension of Mixed Iron Oxide/Manganese Oxide Nanoparticles in Aqueous Surfactant Solutions and Their Use for Mixer Studies in Liquids Feeds
AIChE Annual Meeting
2013
2013 AIChE Annual Meeting
Materials Engineering and Sciences Division
Poster Session: Materials Engineering & Sciences
Monday, November 4, 2013 - 6:00pm to 8:00pm
Nanoparticles combining iron oxide (higher 92%) and manganese oxide (below 8%) have been prepared by mixing aqueous solutions of ferrous sulfate, ferric chloride, manganese chloride and ammonium hydroxide following by continued stirring and heating the forming colloidal Mn-containing magnetite. After addition of oleic acid solution in heptane and stirring the upper organic layer was drawn off and formed ferromagnetic liquid was dispersed in 4% aqueous solution of ammonium oleate. This leads to preparation of stable suspension of nanoparticles with medium size below 90 nm. The content of manganese in prepared samples (about 80mg /liter) was evaluated by spectrophotometric analysis of ferromagnetic material retrieved from suspension by neodymium magnet and dissolved in hydrochloric acid. For determination of Mn- concentration the mixture of ferrous chloride and manganese chloride was oxidized by potassium periodate and absorbance at 526 nm was measured. Results for testing prepared suspension of mixed iron oxide/manganese oxide nanoparticles as tracers for evaluation of mixer efficiency for liquid animal feed will be discussed.