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Synthesis and characterization of co...

Cho, Sung-Jin.

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Synthesis and characterization of core/shell structured magnetic nanomaterials.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Synthesis and characterization of core/shell structured magnetic nanomaterials./
作者:	Cho, Sung-Jin.
面頁冊數:	110 p.
附註:	Source: Dissertation Abstracts International, Volume: 66-07, Section: B, page: 3704.
Contained By:	Dissertation Abstracts International66-07B.
標題:	Chemistry, Inorganic. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3182470
ISBN:	9780542235726

Synthesis and characterization of core/shell structured magnetic nanomaterials.
Cho, Sung-Jin.

Synthesis and characterization of core/shell structured magnetic nanomaterials. - 110 p.

Source: Dissertation Abstracts International, Volume: 66-07, Section: B, page: 3704.

Thesis (Ph.D.)--University of California, Davis, 2005.

Chemical synthesis of Fe-core/Au-shell nanoparticles by a reverse micelle method is developed, and their growth mechanisms and oxidation-resistant characteristics is investigated. The core-shell structure and the presence of the Fe & Au phases have been confirmed by transmission electron microscopy, energy dispersive spectroscopy, X-ray diffraction, Mossbauer spectroscopy, and inductively coupled plasma techniques. Additionally, atomic-resolution Z-contrast imaging and electron energy loss spectroscopy (EELS) in a scanning transmission electron microscope (STEM) have been used to study details of the growth processes. The Au-shell grows by nucleating on the Fe-core surface before coalescing. The rough surface may compromise the oxidation-resistance of the Au shell. Indeed, the magnetic moments of such nanoparticles, in the loose powder form, decrease over time due to oxidation. However, in the pressed pellet form, electrical transport measurements show that the particles are fairly stable, as the resistance of the pellet does not change appreciably over time. Magnetic properties and relaxivities of nanoparticles are presented and compared. Saturation magnetization is 81 emu/g-Fe for freshly prepared nanoparticles and the particles have high relaxivity r1 (13.51 mM-1s-1). Upon exposure to air and water, the Fe core oxidizes; the saturation magnetization is decreased; and the relaxivity r2 increases from 32.12 to 120.72 mM-1 s-1 while r1 decreases to 9.24 mM -1s-1.

ISBN: 9780542235726Subjects--Topical Terms:

517253
Chemistry, Inorganic.

Synthesis and characterization of core/shell structured magnetic nanomaterials.
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