TAILIEUCHUNG - Dynamic effects of dipolar interactions on the specific loss power of Mn0.7Zn0.3Fe2O4
The deviation from the standard superparamagnetic behavior is related to dipolar interaction among nanoparticles. The results are well explained using interacting superparamagnetic model, which is basically a mean field theory. As a consequence, the dipolar interaction affected the specific loss power of . | Vietnam Journal of Science and Technology 56 (1A) (2018) 50-58 DYNAMIC EFFECTS OF DIPOLAR INTERACTIONS ON THE SPECIFIC LOSS POWER OF Pham Hong Nam1, 2, *, Luong Le Uyen3, Doan Minh Thuy3, Do Hung Manh1, Pham Thanh Phong4, 5, Nguyen Xuan Phuc1 1 Graduate University of Science and Technology, 18 Hoang Quoc Viet Road, Cau Giay, Ha Noi, Viet Nam 2 Institute of Materials Science, VAST, 18-Hoang Quoc Viet Road, Cau Giay, Ha noi, Viet Nam 3 Department of Physics, Quy Nhon University; Binh Dinh Province, Viet Nam 4 Theoretical Physics Research Group, Advanced Institute of Materials Science, Ton Duc Thang University, Ho Chi Minh City, Viet Nam 5 Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, Viet Nam * Email: Received: 15 August 2017; Accepted for publication: 20 February 2018 ABSTRACT In this work, isothermal magnetization and initial dc susceptibility of spheroidal, nearly monodisperse nanoparticles (typical diameter: 20 nm) prepared by a hydrothermal route have been measured between 10 and 300 K. The high-temperature inverse magnetic susceptibility was always found to follow a linearly temperature dependence. The deviation from the standard superparamagnetic behavior is related to dipolar interaction among nanoparticles. The results are well explained using interacting superparamagnetic model, which is basically a mean field theory. As a consequence, the dipolar interaction affected the specific loss power of Keywords: magnetic nanoparticles, interacting superparamagnetic model, spinel. 1. INTRODUCTION In recent years, magnetic fluid hyperthermia (MFH) therapy has been considered as a promising therapy for cancer treatment [1]. In the MFH therapy, energy dissipated from magnetic nanoparticles (MNPs) in an alternating magnetic field can be used to locally raise the temperature more above physiological temperature (37oC), in targeted tumor tissues, thereby destroying .
đang nạp các trang xem trước
