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| - Controlling Chemical Reactivity at Solid−Solution Interfaces byMeans of Hydrophobic Magnetic Nanoparticles
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| - Hydrophobic magnetic nanoparticles are employed to reversibly regulate the hydrophobic/hydrophilic propertiesof surfaces and to control the electrochemistry and bioelectochemistry at chemically modified electrodes. Selectivebioelectrocatalytic transformations at relay-functionalized electrodes are accomplished by the magnetic attractions ofthe hydrophobic magnetic nanoparticles with coadsorbed hydrophobic redox relays to the electrode. The selectiveactivation of one of two biocatalysts solubilized in the aqueous electrolyte solution in the absence or presence ofhydrophobic magnetic nanoparticles results in the specific activation of bioelectrocatalytic processes. The magneticattraction and retraction of hydrophobic magnetic nanoparticles to and from semiconductor nanoparticle (CdS)-functionalized electrodes enable the control of the photocurrent directions at the electrode from cathodic to anodicdirections, respectively. The magnetic attraction of the hydrophobic magnetic nanoparticles to the surfaces is alsoemployed to control biorecognition and biocatalytic transformations at solid supports. The magnetic attraction andretraction of the hydrophobic magnetic nanoparticles to and from the surfaces allow the blockage and activation ofDNA hybridization, polymerization, and enzymatic digestion, respectively.
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