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- W2052910002 abstract "Carbon-encapsulated cobalt and nickel nanoparticles with core/shell structure have been successfully synthesized with maize-derived starch as carbon source and metal nitrate as metal precursors in flowing hydrogen. The as-prepared [email protected] materials were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction technique (XRD) and vibrating sample magnetometer (VSM). The effects of the metal precursors on the structure and the size of the [email protected] materials were investigated, and the magnetic properties of the [email protected] materials were measured. The results show that the structure and the size of the [email protected] materials are different in terms of the different metal precursors. The [email protected] materials are made of the fcc-Co core and the graphitic carbon shell, of which the core diameter is in a range of 20–35 nm, while the [email protected] materials are composed of fcc-Ni core and the amorphous carbon shell, of which the core diameter ranges from 30 to 50 nm. The hysteresis loops of the as-made [email protected] materials show that some of the nanoparticles are in a superparamagnetic state at room temperature. A mechanism is proposed to explain the growth process of the [email protected] materials. It is believed that the starch with the helical structure is responsible for the formation of the [email protected] materials featuring the core/shell structure." @default.
- W2052910002 created "2016-06-24" @default.
- W2052910002 creator A5052910310 @default.
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- W2052910002 date "2008-08-01" @default.
- W2052910002 modified "2023-10-09" @default.
- W2052910002 title "Preparation and magnetic behavior of carbon-encapsulated cobalt and nickel nanoparticles from starch" @default.
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- W2052910002 doi "https://doi.org/10.1016/j.cherd.2008.02.006" @default.
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