An alkyl disulfide containing two sulfonate-substituted ferrocenes, 7,8-dithiatetradecane-1,14-di(aminocarbonyl)-bis(1′-ferrocene-1-sulfonic acid), was synthesized and used to form electroactive selfassembled monolayers on gold electrodes. Atomic force microscope (AFM) force curves were employed to measure in situ the change in surface charge as the ferrocene groups were oxidized to compensate ...

Surface potentials, tic, of mixtures of synthetic phosphatides dispersed in uni-univalent electrolyte have been calculated from the limiting molecular areas through use of the Gouy equation. Electrophoretic mobilities of the dispersed particles were measured and used to calculate { potentials from the Hehnholtz-Smoluchowski equation. In analogy with several structurally related systems, the rat...

It has been suggested that decreases in red cell surface-charge density accompany aging in vivo and reflect alterations in the cell surface which play a critical role in the recognition and elimination of effete erythrocytes by macrophages in the reticuloendothelial system. The bases for this suggestion are reports that the surfacecharge density progressively decreases for red cell subpopulatio...

Zirconium dioxide, commonly known as zirconia, is an interesting material and is receiving growing attention due to its excellent mechanical properties. The solid was characterized for surface area measurements, scanning electron microscopy (SEM), Energy dispersive X-ray diffractometry (EDX) and potentiometric titrations. Surface titrations were carried out at the temperature range 303 to 323K ...

A characteristic property of colloidal semiconductor nanocrystal quantum dots (QDs) is their emission intermittency. Although a unifying theory of QD photoprocesses remains elusive, the importance of charged states is clear. We now report a new approach to directly study the role of surface charge on QD emission by adding metal ions to individual, core-only QDs immobilized in aqueous solution i...

T. Astrum, in Proteases and Biological Control, 77, 985 (1980). E. Reich, D. B. Rifkin, E. Shaw, Eds. (Cold 13. W. E. Laug, P. A. Jones, C. A. Nye, W. F. Spring Harbor Laboratory, Cold Spring Harbor, Benedict, Biochem. Biophys. Res. Commun. 68, N.Y., 1975), p. 343. 114 (1976). 5. N. W. Seeds, A. G. Gilman, T. Amano, M. W. 14. J. P. Quigley, J. Cell Biol. 71, 472 (1976). Nirenberg, Proc. Natl. A...

The isoelectric points of three baculoviruses, Trichoplusia ni nuclear polyhedrosis virus (NPV), T. ni granulosis virus, and Spodoptera littoralis NPV were identified by cell electrophoresis. At neutral pH polyhedra were negatively charged. T. ni NPV polyhedra were reacted with a number of reagents which could potentially attach to or degrade their surface structure. This gave information on th...

We study the charge profile of a C60-FET (field effect transistor) as used in the experiments of Schön, Kloc and Batlogg. Using a tight-binding model, we calculate the charge profile treating the Coulomb interaction in a mean-field approximation. At low doping, the charge profile behaves similarly to the case of a continuous space-charge layer and becomes confined to a single interface layer fo...

Nanopipettes are playing an increasingly prominent role in nanoscience, for sizing, sequencing, delivery, detection, and mapping interfacial properties. Herein, the question of how to best resolve topography and surface charge effects when using a nanopipette as a probe for mapping in scanning ion conductance microscopy (SICM) is addressed. It is shown that, when a bias modulated (BM) SICM sche...

We have examined the adsorption behaviors of carbon monoxide (CO) molecule on TiO2 anatase supported Au overlayers. The results of density functional theory (DFT) calculations were used in order to gain insights into the effects of the adsorption of CO molecules on the considered hybrid nanostructures. We have investigated different adsorption geometries of CO over the nanoparticles....