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4 Chemical Transformation of Nanostructures

4 Chemical Transformation of Nanostructures - Lecture-4...

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Chemical Transformation of Nanostructures Lecture-4 Jan 20, 2009 Announcement - Turn in your Project Preference Form today. - Problem set#1 is given out today (download from coursework).
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Making New Nanomaterials with Existing Nanomaterials CdSe nanocrystals Nanowires and nanocrystals of new compounds Chemical reaction Advantages: - Creating new materials based on existing materials. - New materials might have the size and shape closely matching the original materials. - New shape might be possible.
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Chemical Reactions Molecular reactions: instantaneous in gas or solution. Solid state reactions in the bulk: slow, high temperature. MgO Al2O3 MgAl 2 O 4 Reaction interface Nucleation and growth: - Diffusion of atoms - Strain between two phases Mg 2+ Al 3+ NaOH + HCl NaCl +H2O Aqueous solution Reactions at the nanoscale: fast or slow???? + reactant Solid nanostructure
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1. Nanoscale Kirkendall effect 2. Ion exchange 3. Galvanic displacement 4. Solid state reaction
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