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In this study, the influence of particle size distribution in the range of σ =0-0.4 on the specific loss power (SLP) in magnetic fluids based on nanoparticles (NPs) of 6 materials of FeCo, La0.3Sr0.7MnO3, MnFe2O4, -Fe2O3, CoFe2O4 and FePt was evaluated using Linear Response Theory (LRT). | Vietnam Journal of Science and Technology 56 (1A) (2018) 79-85 INFLUENCE OF PARTICLE SIZE DISTRIBUTION ON SPECIFIC LOSS POWER OF MAGNETIC NANOPARTICLE Luu Huu Nguyen1, *, Pham Thanh Phong2, Pham Hong Nam3, Do Hung Manh3, Nguyen Xuan Phuc3, 4 1 Faculty of Natural Science and Technology, University of Khanh Hoa, 01 Nguyen Chanh Road, Nha Trang, Khanh Hoa 2 Department for Management of Science and Technology Development, Ton Duc Thang University, 19 Nguyen Huu Tho Road, District 7, Ho Chi Minh City 3 Institute of Materials Science, VAST, 18 Hoang Quoc Viet Road, Cau Giay, Ha Noi 4 Duy Tan University, 3 Quang Trung, Da Nang City * Email: lhnohh2@gmail.com Received: 15 August 2017; Accepted for publication: 5 February 2018 ABSTRACT In this study, the influence of particle size distribution in the range of σ =0-0.4 on the specific loss power (SLP) in magnetic fluids based on nanoparticles (NPs) of 6 materials of FeCo, La0.3Sr0.7MnO3, MnFe2O4, -Fe2O3, CoFe2O4 and FePt was evaluated using Linear Response Theory (LRT). Results show that while the particle diameters Dcp of maximum SLP remain unchanged, the SLPmax values decrease with increasing size distribution for all the studied materials. The reduction behaviors can be classified into 2 groups, namely group with strong and weak decrease rate for low-anisotropy (FeCo, La0.3Sr0.7MnO3, MnFe2O4, -Fe2O3), and high-anisotropy (CoFe2O4 and FePt) materials, respectively. Keywords: specific loss power (SLP); particle size distribution; Néel – Brown; standard deviation. 1. INTRODUCTION It is now well known that magnetic nanoparticles (MNPs) can absorb energy from an alternating magnetic field (AMF) to create local heating sources, that may be applied in several domains especially in hyperthermia [1,2]. Specific Loss Power (SLP) is commonly used to describe such heating performance of the MNPs [1]. SLP of magnetic fluids depends on many factors including the properties of MNPs suspension such as particle size (D), size .
