A new Schiff base 2-aminothiophenol furfural self assembled monolayer (SAM) has been fabricated on a bare gold electrode as a novel sensor for determination of dopamine. Electrochemical impedance spectroscopywas utilized to investigate the properties of the Au 2-aminothiophenol furfural self assembled monolayermodified electrode (Au ATF SAM-ME) using the [Fe(CN)6]3-/4- redox couple. The electro...

The role of dynamic processes on self-assembled structures of 4'-([2,2':6', 2''-terpyridin]-4'-yl)-[1,1'-biphenyl]-4-carboxylic acid (l) molecules on Au(III) has been studied by scanning tunneling microscopy. The as-deposited monolayer is closed-packed and periodic in a short-range due to dipole forces. A thermal annealing process at 110 degrees drives such disordered monolayer into ordered cha...

Macroscopic concentration of massless charge carriers with linear conic spectrum Dirac Fermions (DF) was shown in 2004 to exist in Highly Oriented Pyrolytic Graphite (HOPG) and governs its electronic properties. These carriers can have the same nature as DF observed in graphite monolayer (Graphene) and let to view HOPG as superposition of 2D carbon layers, almost independent electronically. We ...

In this paper, we present preliminary work on the evaluation of tool extensions we built based on our semantic desktop framework X-COSIM. We discuss different experiments for evaluating tools of a semantic desktop and present our tool extensions COSIMail, COSIFile, and SAM. We explain in detail the setup of a laboratory study designed to gain summative results that enable a comparison of our to...

Microcontact printing of proteins from an elastomeric stamp has been demonstrated on a limited number of substrates. This work explores the generality of this method of patterning proteins by examining the role of surface wettability of both the substrate and the stamp in microcontact printing. The substrates used in this study consisted of two-component, mixed self-assembled monolayers (SAMs) ...

We report a molecular simulation study of the c~432! superlattice structure of alkanethiols on Au~111! based on an accurate force field developed from ab initio quantum chemical calculations. Quantum chemical calculations were performed on both clusters and periodic systems of methylthiols on Au~111! surfaces. Molecular mechanics and dynamics simulations of alkanethiols with various chain lengt...

We present the Federation Semantic Attribute Mapping System (F-SAMS), a web services based system which enables a semiautomated dynamic trust establishment mechanism for managing identity federations. We present the conceptual model which allows current members to dynamically introduce new members into the federation in a trustworthy manner, using a web of trust model. F-SAMS enables existing m...

A conducting atomic force microscope was used to measure the electrical properties of carotenoid molecules attached to a gold electrode. The thiolated carotene molecules were embedded in insulating n-alkanethiol self-assembled monolayers. At a contact force of a few nanoNewtons, a carotenoid molecule behaves ohmically with a resistance of approximately 4.2 ( 0.7 GΩ, over a million times more co...

The “Standard Model” of elementary particle physics encompasses the progress that has been made in the past half-century in understanding the weak, electromagnetic, and strong interactions. The name was apparently bestowed by my Ph. D. thesis advisor, Sam B. Treiman, whose dedication to particle physics kindled the light for so many of his students during those times of experimental and theoret...