Langmuir-Blodgett transfer of octanedecanethiol (Cl&H) containing monolayers onto gold-coated glass slides under potentiostatic conditions leads to a quantitative characterization of Cl&H chemisorption on gold. The thiol-gold bond involves a partial electron transfer from sulfur to the gold substrate. The CL$H partial charge number was determined to vary linearly with the potential of gold subs...

Energetics, electronic structure, charging, and capacitive properties of bare and thiol-passivated Au38 gold nanocrystals were investigated via density-functional calculations. In the energy-optimized passivated nanocrystal, comprised of a truncated-octahedral face-centered-cubic Au38 core coated by a monolayer of 24 methylthiol sSCH3d molecules, we find interfacial charge transfer of about 2e ...

Addition of LETS glycoprotein to normal or transformed cells produces increased migration of the cells, as determined by formation of phagokinetic tracks on gold particle-coated coverslips. These tracks arise by a combination of phagocytosis of the gold particles and cellular migration. Increased motility is also evident on plastic in the absence of gold particles. The added LETS protein attach...

Aβ(1-40) coated 20 nm gold colloidal nanoparticles exhibit a reversible color change as pH is externally altered between pH 4 and 10. This reversible process may contain important information on the initial reversible step reported for the fibrillogenesis of Aβ (a hallmark of Alzheimer's disease). We examined this reversible color change by microscopic investigations. AFM images on graphite sur...

The possibility of Fc-dependent uptake of IgG immune complexes was examined in subcultured rat mesangial cells free of monocytes. 195Au-labeled colloidal gold particles were coated either with BSA only or with BSA followed by rabbit anti-BSA-IgG or the F(ab')2 fragment of the IgG. Mesangial cells preferentially took up 195Au particles covered with BSA-anti-BSA-IgG over those covered with BSA or...

The invasive phenotype of glioma cells is thought to be responsible for recurrences. Ultrasmall Gd3+ chelate-coated gold nanoparticles interfere with capacities migrate and invade due induced changes in intrinsic biomechanical properties.

We fabricated plasmonic gold nanoparticle (AuNP)-TiO2 nanocomposite films and measured the photocurrent that originates from the water-splitting reaction catalyzed by the AuNP-TiO2 nanocomposite photoelectrocatalytic (PEC) electrode. The localized surface plasmon resonance (LSPR) of the gold nanoparticles affected the generation of photocurrent by TiO2 upon illumination with visible light. Elec...