In conjugated polymer devices that switch from one oxidation level to another, such as artificial muscles, it is important to understand memory effects that stem from conformational relaxation movements of the polymer chains. Chronoamperometry during electrochemical switching of polypyrrole doped with dodecylbenzenesulfonate, PPy(DBS), is used to gain insight into the conformational relaxation ...

Microbial biofilms produce electrochemical interactions with metal surfaces by following a wide variety of different electron exchange pathways. Reviewing the mechanisms identified in the biocorrosion of steels leads us to distinguish direct and indirect mechanisms for biofilm-catalysed cathodic reactions. Indirect mechanisms are due to the production of metal oxides or hydrogen peroxide (aerob...

Title of Thesis: CHRONOAMPEROMETRIC STUDY OF CONFORMATIONAL RELAXATION IN PPY(DBS) Bryan Jason West, Master of Science, 2008 Thesis directed by: Professor Elisabeth Smela Department of Mechanical Engineering Professor Benjamin Shapiro Department of Aerospace Engineering In conjugated polymer devices that switch from one oxidation level to another, such as artificial muscles, it is important to ...

Changes in peroxidase activity as well as isozyme peroxidase pattern were analyzed in five cell wall (CW) fractions of barley roots exposed to 1mM CdCl2 for 48 and 72 h. Whereas strong inhibition of peroxidase activity was detected in fraction CW I and weak inhibition in fractions CW II, III and IV, strong activation of peroxidase was observed in fraction V after Cd application. Despite the inh...

The redox behavior of spironolactone (SP) drug in Britton-Robinson (BR) buffer of pH 2-11 was investigated by differential pulse cathodic stripping voltammetry (DPCSV) and cyclic voltammetry (CV) at hanging mercury dropping electrode (HMDE). At pH 9-10.5, the DPCSV of SP drug showed two cathodic peaks at -1.15 and -1.38 V at the HMDE vs. Ag/AgCl reference electrode. In the CV, at pH 9-10, the d...

A new photocurrent-generation system based on Ru(bpy)3(2+) (bpy=2,2'-bipyridine) tethered on phospholipid/alkanethiol hybrid bilayers in aqueous media is reported. The construction of such a system is straightforward. First, a self-assembled monolayer (SAM) of alkanethiol is formed on gold, and separately, liposomes containing Ru(bpy)3(2+)-conjugated dioleoylphosphoethanolamine (DOPE) are prepa...

A bromide–modified silver electrode is reported, in the present study, to catalyze the redox reactions of metalloproteins. This study describes that the bromide ions show very good redox behavior with silver electrode. The cathodic and anodic peak potentials were related to the concentration of bromide ions involved in making bromide-modified silver electrode. The electrode reaction in the brom...

Cu electrodeposition onto Ru during dual damascene processing is complicated by the possible presence of Ru oxide, which is known to exist at more cathodic potentials than predicted by its Pourbaix diagram. Several research groups have proposed cathodic treatments prior to Cu electrodeposition to reduce Ru oxide, but these methods were developed semiempirically. We report voltammetry and impeda...

There is a need for alternative catalysts for oxygen reduction in the cathodic compartment of a microbial fuel cell (MFC). In this study, we show that a bipolar membrane combined with ferric iron reduction on a graphite electrode is an efficient cathode system in MFCs. A flat plate MFC with graphite felt electrodes, a volume of 1.2 L and a projected surface area of 290 cm2 was operated in conti...

OBJECTIVE To assess the effect of high-voltage cathodic current on pain from a sciatica experimental model. METHODS A total of 16 male Wistar rats were submitted to the sciatica experimental model in the right hind paw. They were divided into sham group (GS) and group treated with cathodic current (GP-) for 20 min/daily, for 10 days). The model of sciatic compression was performed with a 4.0-...