Water-assisted and surfactant-free synthesis of cobalt ferrite nanospheres via solvothermal method

Bi, Yiqing; Ren, Yanan; Bi, Feng; He, Tao

doi:10.1016/j.jallcom.2015.06.180

Cited by 13 publications

(1 citation statement)

References 17 publications

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“…One type of NPs which is called spinel ferrites with the general formula AFe 2 O 4 (A = Mn, Co, Ni, Mg, or Zn) is unique due to their tunable physical and chemical properties according to their nanoscale size [3]. They also can be produced in many forms, such as thin films [4] and nanopowders [5] that can be shaped as nanofibers [6], nanowires [7], nanospheres [8], and any desired geometry particles [9]. Applications of spinel ferrites NPs include biosensor [10], photocatalysis [11], drug delivery [12], and hyperthermia [13].…”

Section: Introductionmentioning

confidence: 99%

Modified copper zinc ferrite nanoparticles doped with Zr ions for hyperthermia applications

et al. 2022

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The problem of the present work is to synthesize a nanomagnetic material with low TC below 45 °C and its particle size below 30 nm to be appropriate material for convert magnetic loss into heat energy. A series of Cu0.4Zn0.6+yZryFe2–2yO4 nanoparticles compositions where y = (0.05, 0.1) were synthesized via citrate sol–gel method. The prepared samples were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The grains were observed from SEM confirming the crystalline structure of the ferrite which was detected by X-ray diffraction. Magnetic hysteresis loop measurements illustrate that materials exhibit soft magnetic properties at low Zr content, while at higher Zr content all materials behave as superparamagnetically without any saturation magnetization Ms. The initial magnetic permeability ($${\mu }_{i}$$ μ i ) at frequency 10 kHz as a function of temperature was measured. A sudden change in $${\mu }_{i}$$ μ i appears around Curie temperature, making our samples good candidates for magnetic temperature transducer (MTT) devices. The DC resistivity for sample at y = 0.05, 0.1 was studied. The resistivity decreases linearly with increasing temperature within the given range of temperature up to 666 K for all samples. The dielectric constant of all samples is nearly independent on temperature through the range of 450 to 600 K which is a common character of ferrites. The dielectric loss was found to increase by increasing temperature, which may be related to the increase in AC conductivity. Hyperthermia measurements show the maximum specific power loss and temperature increase were 26 w/gr and 43 °C, respectively, for sample containing Zr = 0.05, after 2 min of measurements. One of the real applications of the material is that it is used as an effective method in tumor treatment by exposing the patient to external magnetic field.

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