Tunable heat generation in nickel-substituted zinc ferrite nanoparticles for magnetic hyperthermia

Abstract

We report a high performance magnetic nanoparticle as hyperthermic agent under low applied field and frequency. CTAB (cetyltrimethylammonium bromide)-coated NixZn1-xFe2O4 nanoparticles of average particle size < 25 nm with various...

Role of Dipolar Interactions on the Determination of the Effective Magnetic Anisotropy in Iron Oxide Nanoparticles

“…In Figure 8, the experimental data of ln(f exp /f 0 ) against 1/T B , obtained from AC 𝜒″(T) measurements for the MC10-SX set at 1 and 10 Oe (Figure S12a,b (Supporting Information) for MC8-SX and MC15-SX MNPs, respectively), follows a linear relationship in accordance with Equation (11). Using Equation (11), the ΔE Values, were computed and compiled in Table 1.…”

“…In Figure 8, the experimental data of ln(f exp /f 0 ) against 1/T B , obtained from AC 𝜒″(T) measurements for the MC10-SX set at 1 and 10 Oe (Figure S12a,b (Supporting Information) for MC8-SX and MC15-SX MNPs, respectively), follows a linear relationship in accordance with Equation (11). Using Equation (11), the ΔE Values, were computed and compiled in Table 1. If at this point, it is considered that the only contribution to the ΔE comes from the anisotropy term, ΔE = E A (as it is commonly used in many works in the field, without considering other energy terms), K eff can be computed noting that E A = K A V NP .…”

“…[ 8 ] Therefore, with a negligible contribution of the Brown relaxation, the enhancement of the hyperthermia performance requires the optimization of the Néel relaxation parameters that remain unaffected by the biological microenvironment. [ 9 , 10 ] Hence, in recent years, a great deal of effort has been made to design iron oxide‐based MNPs such as nickel‐substituted zinc ferrite, [ 11 ] core/shell iron oxide [ 12 , 13 ] or maghemite MNPs, [ 14 ] aiming to maximize heat generation by tailoring K eff . This strategy requires the precise determination of K eff , to correctly predict the magnetic response of MNPs [ 15 ] in magnetic hyperthermia applications.…”

Recent advances in zinc ferrite (ZnFe2O4) based nanostructures for magnetic hyperthermia applications

“…The Ni doped ZFNPs do not show promising results. A few additional recent studies include those conducted by Kahmei et al , 127 Manohar et al , 128 Ashfaq Ahmad et al , 129 Tovstolytkin et al 130 and Ashfaq Ahmad et al 131 A list of the articles reporting research using Ni doped ZFNPs is given in Table 6. These articles found that the saturation magnetization is approximately 30 emu g −1 for these nanoparticles.…”

Interplay of Anisotropy Energy Barrier and Self-Heating Efficiency of Cobalt-Substituted CuFe2O4 Nanoparticles

“…However, contrary findings are reported in some other works of literature. Kahmei et al found an opposite trend of specific absorption rate (SAR) value corresponding to the anisotropy energy barrier for CTAB-coated nickel substituted ZnFe 2 O 4 MNPs. It must be pointed out that many studies where the anisotropy energy and SAR value exhibit a proportionate relationship have not considered the effect of dipolar interaction. − However, numerous other works of literature make it abundantly evident how powerfully dipolar interaction can affect the self-heating behavior of MNPs .…”