Potential-controlled molecular machinery of bipyridinium monolayer-functionalized surfaces: an electrochemical and contact angle analysisElectronic supplementary information (ESI) available: experimental details on the electrode modification, electrochemical and contact angle measurements. See http://www.rsc.org/suppdata/cc/b3/b303845a/

Wang, Xuemei; Kharitonov, Andrei B.; Katz, Eugenii; Willner, Itamar

doi:10.1039/b303845a

Cited by 76 publications

(49 citation statements)

References 16 publications

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“…[1] Monolayer-functionalized surfaces, [2] and organic [3] or inorganic [4] polymers organized as thin-films on supports have been used to control the hydrophilic and hydrophobic properties of the interfaces. Thermal or pH triggers have been used to switch the superhydrophobic and superhydrophilic properties of surfaces modified with poly-[(isopropyl acrylamide)-co-(acrylic acid)] copolymer.…”

Section: Introductionmentioning

confidence: 99%

“…The monoexponential character of the current transients provides evidence for the homogeneous structures of the redox monolayers. [22] The current transients, I(t), were analyzed according to Equation [2], where k et corresponds to the interfacial electron transfer and Q corresponds to the charge associated with the respective redox process of the surface-confined species. [22] IðtÞ ¼ k et Q exp ðÀk et tÞ ð 2Þ The derived Q values, corresponding to the charges associated with the redox transformations of the respective electroactive species, are similar to those calculated by the integration of the respective waves in the cyclic voltammograms, thus resulting in the same surface coverage of the mercury species on the dithiol monolayer (ca.…”

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confidence: 99%

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Cyclic Control of the Surface Properties of a Monolayer‐Functionalized Electrode by the Electrochemical Generation of Hg Nanoclusters

Riskin

Basnar

Katz

et al. 2006

Chemistry A European J

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Hg(2+) ions are bound to a 1,4-benzenedimethanethiol (BDMT) monolayer assembled on a Au electrode. Electrochemical reduction of the Hg(2+)-BDMT monolayer to Hg(+)-BDMT (at E degrees =0.48 V) and subsequently to Hg(0)-BDMT (at E degrees =0.2 V) proceeds with electron-transfer rate constants of 8 and 11 s(-1), respectively. The Hg(0) atoms cluster into aggregates that exhibit dimensions of 30 nm to 2 microm, within a time interval of minutes. Electrochemical oxidation of the nanoclusters to Hg(+) and further oxidation to Hg(2+) ions proceeds with electron-transfer rate constants corresponding to 9 and 43 s(-1), respectively, and the redistribution of Hg(2+) on the thiolated monolayer occurs within approximately 15 s. The reduction of the Hg(2+) ions to the Hg(0) nanoclusters and their reverse electrochemical oxidation proceed without the dissolution of mercury species to the electrolyte, implying high affinities of Hg(2+), Hg(+), and Hg(0) to the thiolated monolayer. The electrochemical transformation of the Hg(2+)-thiolated monolayer to the Hg(0)-nanocluster-functionalized monolayer is characterized by electrochemical means, surface plasmon resonance (SPR), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), atomic force microscopy (AFM), and contact-angle measurements. The Hg(0)-nanocluster-modified surface reveals enhanced hydrophobicity (contact angle 76 degrees ) as compared to the Hg(2+)-thiolated monolayer (contact angle 57 degrees ). The hydrophobic properties of the Hg(0)-nanocluster-modified electrode are further supported by force measurements employing a hydrophobically modified AFM tip.

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Cyclic Control of the Surface Properties of a Monolayer‐Functionalized Electrode by the Electrochemical Generation of Hg Nanoclusters

Riskin

Basnar

Katz

et al. 2006

Chemistry A European J

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“…Figure 3 lists some of the many smart molecules described in the literature, i.e., thermo-, glucose-, pH-, electricity-or photo-responsive molecules. [48][49][50][51][52][53] If polarity, conformation, functional group of an interfacial molecule change, the physical properties of the stimuli responsive molecules change accordingly.…”

Section: Design and Synthesis Of Target Moleculesmentioning

confidence: 99%

Bio‐Inspired, Smart, Multiscale Interfacial Materials

2008

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In this review a strategy for the design of bioinspired, smart, multiscale interfacial (BSMI) materials is presented and put into context with recent progress in the field of BSMI materials spanning natural to artificial to reversibly stimuli‐sensitive interfaces. BSMI materials that respond to single/dual/multiple external stimuli, e.g., light, pH, electrical fields, and so on, can switch reversibly between two entirely opposite properties. This article utilizes hydrophobicity and hydrophilicity as an example to demonstrate the feasibility of the design strategy, which may also be extended to other properties, for example, conductor/insulator, p‐type/n‐type semiconductor, or ferromagnetism/anti‐ferromagnetism, for the design of other BSMI materials in the future.

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“…[1][2][3] Recently, a variety of smart surfaces with reversibly switchable wettability have been developed. The reversible switching is realized through the adjustment of electrical potential, [4][5][6] temperature, [7,8] and light illumination, [9][10][11][12][13] adsorption of biopolymer, [14] and treatment of selective solvents. [15,16] Among these approaches, the switch of the electrical potential receives special attention because it is simple and conveniently controlled by electricity.…”

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Reversible Conversion of Conducting Polymer Films from Superhydrophobic to Superhydrophilic

et al. 2005

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On‐again, off‐again personality: Superhydrophobic conducting polypyrrole (PPy) films are synthesized through a facile electrochemical process. The PPy films exhibit an extended porous structure with both coarse‐ and fine‐scale roughness (see image). By controlling the electrical potential, PPy films can be switched between the oxidized state and the neutral state, resulting in reversibly switchable superhydrophobic and superhydrophilic properties.

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Cited by 76 publications

References 16 publications

Cyclic Control of the Surface Properties of a Monolayer‐Functionalized Electrode by the Electrochemical Generation of Hg Nanoclusters

Cyclic Control of the Surface Properties of a Monolayer‐Functionalized Electrode by the Electrochemical Generation of Hg Nanoclusters

Bio‐Inspired, Smart, Multiscale Interfacial Materials

Reversible Conversion of Conducting Polymer Films from Superhydrophobic to Superhydrophilic

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