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Size control and characterization of...

San Jose State University.

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Size control and characterization of colloidal magnetic cobalt nanoparticles.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Size control and characterization of colloidal magnetic cobalt nanoparticles./
作者:	Singh, Abhishek.
面頁冊數:	70 p.
附註:	Adviser: Gregory Young.
Contained By:	Masters Abstracts International47-02.
標題:	Engineering, Chemical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1459716
ISBN:	9780549891314

Size control and characterization of colloidal magnetic cobalt nanoparticles.
Singh, Abhishek.

Size control and characterization of colloidal magnetic cobalt nanoparticles. - 70 p.

Adviser: Gregory Young.

Thesis (M.S.)--San Jose State University, 2008.

The overall goals of this research were to synthesize magnetic cobalt nanoparticles and characterize their structural and magnetic properties. Cobalt nanoparticles were synthesized via high temperature reduction of cobalt chloride utilizing two different surfactants, tributylphosphine and trioctylphosphine, and varying the surfactant-to-reagent molar concentration for each. X-ray diffraction results indicate that each synthesis condition yielded nanoparticles with an &egr;-cobalt crystal structure, a resemblance to the beta-manganese structure. Transmission electron micrographs indicate the formation of discrete hexagonal networks among the particles with inter-particle spacing of 2--5 nm. Sizing analysis found that utilizing a bulkier surfactant yields smaller mean particle size. Furthermore, utilizing a surfactant at a higher surfactant-to-reagent molar ratio also yields a smaller mean particle size with a tighter distribution. Normalized vibrating sample magnetometer results indicate synthesized cobalt nanoparticles exhibit ferromagnetic behavior at room temperature and increasing coercivity with mean particle size.

ISBN: 9780549891314Subjects--Topical Terms:

1018531
Engineering, Chemical.

Size control and characterization of colloidal magnetic cobalt nanoparticles.
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502 $a Thesis (M.S.)--San Jose State University, 2008.
520 $a The overall goals of this research were to synthesize magnetic cobalt nanoparticles and characterize their structural and magnetic properties. Cobalt nanoparticles were synthesized via high temperature reduction of cobalt chloride utilizing two different surfactants, tributylphosphine and trioctylphosphine, and varying the surfactant-to-reagent molar concentration for each. X-ray diffraction results indicate that each synthesis condition yielded nanoparticles with an &egr;-cobalt crystal structure, a resemblance to the beta-manganese structure. Transmission electron micrographs indicate the formation of discrete hexagonal networks among the particles with inter-particle spacing of 2--5 nm. Sizing analysis found that utilizing a bulkier surfactant yields smaller mean particle size. Furthermore, utilizing a surfactant at a higher surfactant-to-reagent molar ratio also yields a smaller mean particle size with a tighter distribution. Normalized vibrating sample magnetometer results indicate synthesized cobalt nanoparticles exhibit ferromagnetic behavior at room temperature and increasing coercivity with mean particle size.
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