Accessible and green manufacturing of magnetite (ferrous ferric oxide) nanocrystals and their use in magnetic separations

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dc.contributor.advisorColvin, Vicki L.en_US
dc.creatorYavuz, Cafer Tayyaren_US
dc.date.accessioned2009-06-03T19:53:33Zen_US
dc.date.available2009-06-03T19:53:33Zen_US
dc.date.issued2008en_US
dc.description.abstractThis 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.en_US
dc.format.extent199 p.en_US
dc.format.mimetypeapplication/pdfen_US
dc.identifier.callnoTHESIS CHEM. 2008 YAVUZen_US
dc.identifier.citationYavuz, Cafer Tayyar. "Accessible and green manufacturing of magnetite (ferrous ferric oxide) nanocrystals and their use in magnetic separations." (2008) Diss., Rice University. <a href="https://hdl.handle.net/1911/22266">https://hdl.handle.net/1911/22266</a>.en_US
dc.identifier.urihttps://hdl.handle.net/1911/22266en_US
dc.language.isoengen_US
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.subjectInorganic chemistryen_US
dc.subjectEnvironmental scienceen_US
dc.subjectEngineeringen_US
dc.subjectMaterials scienceen_US
dc.titleAccessible and green manufacturing of magnetite (ferrous ferric oxide) nanocrystals and their use in magnetic separationsen_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentChemistryen_US
thesis.degree.disciplineNatural Sciencesen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelDoctoralen_US
thesis.degree.nameDoctor of Philosophyen_US
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