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NIRT: Nanometer Stoichiometric Particle Compound Solutions and Control of their Self-Assembly into the Condensed Pha

NIRT: Nanometer Stoichiometric Particle Compound Solutions and Control of their Self-Assembly into the Condensed Phase Chris Sorensen, C. Aakeröy , A. Chakrabarti, K. Klabunde and B. Law Departments of Physics and Chemistry, Kansas State University. Goals

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NIRT: Nanometer Stoichiometric Particle Compound Solutions and Control of their Self-Assembly into the Condensed Pha

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  1. NIRT: Nanometer Stoichiometric Particle Compound Solutions and Control of their Self-Assembly into the Condensed Phase Chris Sorensen, C. Aakeröy, A. Chakrabarti, K. Klabunde and B. Law Departments of Physics and Chemistry, Kansas State University • Goals • Synthesize a library of monodisperse functional nanoparticles (NP). • Study NP solution phase behavior and nucleation. • Controlled assembly of NP into 2d and 3d superlattices and gels. • Study NP solution surface and interfacial properties. • 1. Synthesis 3. NP-NP Interactions 2. Solution Phase and Nucleation • Core-core • Core-ligand • Ligand-ligand • All mediated by the solvent Solvated Metal Atom Dispersion Reactor One phase; individual, dissolved 5.5nm NPs. Two phase; clusters of NPs. Au/C12SH NP (5.5nm) colloidal solution at different temperatures, solvent: t-butyltoluene + 2-butanone. The phase transition is reversible! Static and dynamic light scattering to observe cluster formation via nucleation as quench NP solution from one phase to two. x = 1.3 is found in Au/C12SH NP superlattices. 4. Surface Interactions Deep quench yields lots of small clusters, shallow quench a few big clusters. Droplets of Au/3-mercapto-1, 2-propanediol NP in H2O on glass. Left no NP, contact angle = 7o; right with NP, contact angle = 23o. Fat Fractals Solution of Au/SHC11COOH in DMSO yields fractal/superlattice hybrid, with hydrogen bonds when quenched. NPs of Au, Ag, CdSe, In. Dia. ~ 4 to 10nm Ligands. Nonfunctionalized: CnSH, CnNH2, P(C8)3 Functionalized: HSCnCOOH, HSCnOH, HSCn polyols bis(8-imidazol-1-yloctyl)disulfide Solvents: toluene, t-butyltoluene, 2-butanone, CH3OH, water, DMSO. NPs affect wetting.

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