PENENTUAN SUSEPTIBILITAS MAGNETIK DAN MORFOLOGI NANOPARTIKEL MAGNETIK DISINTESIS MENGGUNAKAN BALL MILLING MELALUI VARIASI BOLA MILLING

Abstract

Susceptibility magnetic and morphological properties of magnetic nanoparticles of natural sand from Sungai Suci Bengkulu beach have been determined. The magnetik nanoparticles were synthesized using ball milling through variations in the size of the milling balls. Separation of iron oxide and non iron oxide particles of the samples were separated by Niodymium Iron Boron (NdFeB) magnets. The produc is called NdFeB product. The Process of milling used ball milling and using a combination of milling ball with diameter of 0.5 , 0.7 and 1.5 cm. The results were called BM I products. The process of milling was continued by milling of the BM I product as a function of milling balls size, namely 0.5, 0.7 and 1.5 cm. The results are called BM II A, BM II B, and BM II C products. Magnetic induction of solenoid (Bo) and total magnetic induction of solenoid (Bt) was measured using Pasco magnetic Probe PS-216 as a function of currents of 200, 400, 600, 800 and 1000 mA. The calculation of the magnetic susceptibility was carried out based the values of Bo and Bt for the BM II product as a function of ball size of 0.5 , 0.7 , and 1.5 cm. The results show that the magnetic susceptibility of the samples increases from 6122 x 10-5, to 10428 x 10-5 with increasing milling ball size from 0.5 to 1.5 cm, respectively. Scanning electron miscroscope (SEM) was utilized in order to determine the morphology of magnetic nanoparticles of BM II products. SEM results show that the particle size of the sample decreases with increasing milling ball size. however, the BM II product using milling ball size 0.7 cm shows that the particles experience agglomeration due to the presence of inter-particle attraction.