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Preparation and characterization of ferromagnetic fluids modified by carboxyl PEG

Journal of Chinese Pharmaceutical Sciences 2012年第1期21卷 50-56页

作者： Yan-Fei Zhou Ling-Ran Du Chao Zhou Tian-Yuan Fan Department of Pharmaceutics School of Pharmaceutical SciencesPeking University Health Science CenterBeijing 100191China

To prepare and characterize the ferromagnetic fluid of Fe304 modified by carboxyl PEG （FF/carboxyl PEG） for hyperthermia of tumor, the magnetic nanoparticles （NPs） of Fe304 were prepared by chemical co-precipitation method, and then modified with carboxyl PEG. The iron content of FFs was determined by spectrophotometric method using o-phenanthroline. The stability of FF/carboxyl PEG was assessed by the sedimentation method. FF/carboxyl PEG was characterized by X-ray diffraction （XRD）, transmission electron microscopy （TEM）, infrared spectrometry （IR） and vibrating sample magnetometer （VSM）. Heating effect of FF/carboxyl PEG was measured in an alternating magnetic field in vitro. The stability of FF/carboxyl PEG was much better than that of unmodified ferromagnetic fluid. FF/carboxyl PEG was proved to be composed of Fe304 by both XRD and IR. TEM showed that the ferromagnetic particles were well-dispersed. The average particle size was calculated as 5 nm by XRD. The saturation magnetization and residual magnetization of FF/carboxyl PEG were 47.01 and 3.41 emu/g, respectively. The coercive force was 6.70e. The specific absorption rate （SAR） of the FF/carboxyl PEG was 63.0 W/g[Fe]. The FF/carboxyl PEG shows the promise for hyperthermia of tumor.

关键词： ferromagnetic fluid Fe304 Carboxyl PEG Heating effect Hyperthermia

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Hybrid Isothermal Model for the Ferrohydrodynamic Chemically Reactive Species

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Communications in Theoretical Physics 2019年第4期71卷 384-392页

作者： Noor Muhammad S.Nadeem M.T.Mustafa Department of Mathematics Quaid-I-Azam University 45320 Department of Mathematics Statistics & Physics Qatar University

A hybrid isothermal model for the homogeneous-heterogeneous reactions in ferrohydrodynamic boundary layer ?ow is established. The characteristics of Newtonian heating and magnetic dipole in a ferro?uid due to a stretchable surface is analyzed for three chemical species. It is presumed that the isothermal cubic autocatalator kinetic gives the homogeneous reaction and the ?rst order kinetics gives the heterogeneous(surface) reaction. The analysis is carried out for equal diffusion coe?cients of all autocatalyst and reactions. Heat ?ux is examined by incorporating Fourier's law of heat conduction. Characteristics of materialized parameters on the magneto-thermomechanical coupling in the ?ow of a chemically reactive species are investigated. Further, the heat transfer rate and friction drag are depicted for the ferrohydrodynamic chemically reactive species. It is evident that the Schmidt number has increasing behavior on the rate of heat transfer in the boundary layer. Comparison with available results for speci?c cases is found an excellent agreement.

关键词： ferromagnetic fluid hybrid chemically reactive species Newtonian heating heat transfer friction drag

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