Self-Assembly into the Condensed Phase

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Presentation transcript:

Self-Assembly into the Condensed Phase 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. Fat Fractals Solution of Au/SHC11COOH in DMSO yields fractal/superlattice hybrid, with hydrogen bonds when quenched. 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. 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.