Influence of Ionic Surfactants under Ultrasonic Irradiation to Reduce the Particle Size of Mechanically Alloyed La_1-XSr_X Fe_0.5Mn_0.25Ti_0.25O₃ Powders

Abstract:

In this study, nanoparticles La_1-xSr_xFe_0.5Mn_0.25Ti_0.25O₃ particles were prepared by two successive methods: the mechanical alloying (MA) with the successive sintering and the deagglomeration of MA powders in the demineralized water containing surfactant under ultrasonic irradiation. It is shown that MA powders have coarser particle size of a slightly less than 6 micron in average. Additionally, the particle size distribution was relatively broadening which indicates a large size variation in particle sizes. As MA powders were dispersed in the demineralized water and irradiated by a 40 KHz ultrasonic wave for 5 hours the particle size distribution was improve significantly, it has a narrow particle size distribution with a mean particle size almost 180 nm. The particle has crystallite with mean size 20-26 nm subject to XRD line broadening analysis. Thus, the particles can be called nanoparticles clusters. The study also indicated the breakup of nanoparticle cluster was no longer effective in a prolonged ultra sonication time and yet reagglomeration was obvious. However, the latter was not occurred in a disperse media containing surfactants. In this study, four types of surfactant were used and their influences to the particle sizes were evaluated. According to this study, the four types of surfactants could reduce further the particle size but in different pathways. Sodium Dodecyl Sulphate (SDS) as anionic surfactant reduced the sizes of nanoparticle clusters to almost 180 nm by one step ultra sonication. While cationic, non-ionic and amphoteric surfactants promoted the gel formation in the first place, the nanoparticle clusters were then obtained after an additional heating to breaking the gel form to dry powders. The present of gel was due to stabilization process of the particle to avoid any re-agglomeration between each fine particle. In this paper, we discussed a systematic material preparation towards nanoparticles clusters and the mechanism as well as influence of surfactants in particle size reduction for LSMFTO powders.

• Periodical: Advanced Materials Research (Volume 896)
• Pages: 116-121
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.896.116
• Online since: February 2014
• Authors: Mas Ayu Elita Hafizah*, Azwar Manaf, Bambang Soegijono
• Keywords: Mechanical Alloying, Nanoparticle, Particle Size Distribution, Sonochemistry, Surfactant

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