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- W1993669540 abstract "The polydiethylsiloxane-based ferrofluid was prepared by dispersing finely divided magnetic Fe3O4 particles which are modified with oleoyl sarcosine and lauroyl sarcosine. The optimized experiment parameters including molar ratio of surfactant to Fe3O4 (1:5), temperature (80 °C), stirring rate (300 RPM), the surfactant content of lauroyl sarcosine (0 to 33 mol%) and the modification time (25 min) were obtained by the orthogonal test. The magnetic liquid was characterized by a transmission electron microscope (TEM), infrared (IR) spectrometer, X-ray diffractometer (XRD), thermogravimetry (TG), vibrating sample magnetometer (VSM) and differential scanning calorimetry (DSC). It is indicated that the surfactant is mainly bonded to the surface of Fe3O4 nanoparticles through covalent bond between carboxylate (COO−) and Fe atom. The modified magnetic particles are equally dispersed into the carrier and remain stable below −12 °C over 4 months. The ferrofluids exhibit excellent frost resistance property and distinctly reduced temperature coefficient of viscosity compared with polydimethylsiloxane-based ferrofluids and hydrocarbon-based ferrofluids, respectively. The saturation magnetization could reach up to 27.7 emu/g." @default.
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- W1993669540 date "2009-03-01" @default.
- W1993669540 modified "2023-09-24" @default.
- W1993669540 title "Study of polydiethylsiloxane-based ferrofluid with excellent frost resistance property" @default.
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- W1993669540 doi "https://doi.org/10.1016/j.jmmm.2008.09.019" @default.
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