NIRT: Nanometer Stoichiometric Particle Compound Solutions and Control of their Self-Assembly...
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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 NPs of Au, Ag, CdSe, In. Dia. ~ 4 to 10nm Ligands. Nonfunctionalized: C n SH, C n NH 2 , P(C 8 ) 3 Functionalized: HSC n COOH, HSC n OH, HSC n polyols Solvents: toluene, t-butyltoluene, 2-butanone, CH 3 OH, water, DMSO. Solvated Metal Atom Dispersion Reactor bis(8-imidazol-1- yloctyl)disulfide 2. Solution Phase and Nucleation Fat Fractals Solution of Au/SHC 11 COOH in DMSO yields fractal/superlattice hybrid, with hydrogen bonds when quenched. Au/C 12 SH 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. One phase; individual, dissolved 5.5nm NPs. Two phase; clusters of NPs. Deep quench yields lots of small clusters, shallow quench a few big clusters. 3. NP-NP Interactions 4. Surface Interactions • Core-core • Core-ligand • Ligand-ligand All mediated by the solvent Droplets of Au/3-mercapto-1, 2-propanediol NP in H 2 O on glass. Left no NP, contact angle = 7 o ; right with NP, contact angle = 23 o . x = 1.3 is found in Au/C 12 SH NP superlattices. NPs affect wetting.
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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 - PowerPoint PPT Presentation
Transcript of NIRT: Nanometer Stoichiometric Particle Compound Solutions and Control of their Self-Assembly...
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. LawDepartments 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
NPs of Au, Ag, CdSe, In. Dia. ~ 4 to 10nmLigands. Nonfunctionalized: CnSH, CnNH2, P(C8)3
Functionalized: HSCnCOOH, HSCnOH, HSCn polyols
Solvents: toluene, t-butyltoluene, 2-butanone, CH3OH, water, DMSO.
Solvated Metal Atom Dispersion Reactor
bis(8-imidazol-1-yloctyl)disulfide
2. Solution Phase and Nucleation
Fat Fractals
Solution of Au/SHC11COOH in DMSO yields fractal/superlattice hybrid, with hydrogen bonds when quenched.
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.
One phase; individual,dissolved 5.5nm NPs.
Two phase; clusters of NPs.
Deep quench yields lots of small clusters, shallow quench a few big clusters.
3. NP-NP Interactions
4. Surface Interactions
• Core-core• Core-ligand• Ligand-ligand
All mediated by the solvent
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.
x = 1.3 is found in Au/C12SH NP superlattices.
NPs affect wetting.
