dc.contributor.advisor Colvin, Vicki L. Yavuz, Cafer Tayyar 2009-06-03T19:53:33Z 2009-06-03T19:53:33Z 2008 https://hdl.handle.net/1911/22266 This work describes the first size dependent magnetic separation in nanoscale. Magnetite (Fe3O4) nanocrystals of high quality and uniform size were synthesized with monodispersity below 10%. Magnetite nanocrystals of 4 nm to 33 nm (average diameter) were produced. Batch synthesis was shown to go up to 20 grams which is more than 10 times of a standard nanocrystal synthesis, without loosing the quality and monodispersity. Reactor design for mass (1 gram per hour) production of magnetite nanocrystals is reported for the first time. The cost of a kg of lab purity magnetite nanocrystals was shown to be $2600. A green synthesis that utilizes rust and edible oils was developed. The cost of a kg was brought down to$22. Size dependency of magnetism was shown in nanoscale for the first time. Reversible aggregation theory was developed to explain the low field magnetic separation and solution behavior of magnetite nanocrystals. Arsenic was removed from drinking water with magnetite nanocrystals 200 times better than commercial adsorbents. Silica coating was successfully applied to enable the known silica related biotechnologies. Magnetite--silica nanoshells were functionalized with amino groups. For the first time, silver was coated on the magnetite--silica nanoshells to produce triple multishells. Anti-microbial activity of multishells is anticipated. 199 p. application/pdf eng Inorganic chemistryEnvironmental scienceEngineeringMaterials science Accessible and green manufacturing of magnetite (ferrous ferric oxide) nanocrystals and their use in magnetic separations Thesis Text Chemistry Natural Sciences Rice University Doctoral Doctor of Philosophy Yavuz, Cafer Tayyar. "Accessible and green manufacturing of magnetite (ferrous ferric oxide) nanocrystals and their use in magnetic separations." (2008) Diss., Rice University. https://hdl.handle.net/1911/22266.
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