EFFECT OF VARIATIONS OF LAURIC ACID ON THE SIZE OF MAGNETIC NANOPARTICLES FROM IRON SANDS ESTABLISH BATANG MASANG PASAMAN

Abstract

Synthesis of magnetite nanoparticles has been carried out using iron sand from Muara Batang Masang Gadang Pasaman. This research is aim to investigate of lauric acid effect for measurement of crystal size in magnetite nanoparticle of iron sands. The research on the synthesis of magnetite nanoparticles used a 12 M HCl solution to dissolve iron sand, then the filtrate obtained was precipitated using the precipitation method, namely the coprecipitation method using NH4OH solution, but with the coprecipitation method it is difficult to get a uniform size, so it is necessary to add lauric acid to coat the particles in order to no agglomeration occurs. Crystal size obtained using XRD instrument. The results showed that lauric acid variations gave the same crystal structure, namely cubic, but different crystal sizes. The optimum size was obtained with the addition of 1.25 grams of lauric acid with the highest peak of 2θ = 35.54, with an intensity of 491.9154, so that the crystal size obtained by the Scherre Debye equation was 20.2 nm. The expected crystal size is below 20 nm because it can be used in the biomedical field. The results showed that the more lauric acid was added, the smaller the crystal size obtained, but there was a limit to the addition of lauric acid, because with excess lauric acid agglomeration would occur and the size obtained would increase.