Magnetoswitchable Controlled Hydrophilicity/Hydrophobicity of Electrode Surfaces Using Alkyl-Chain-Functionalized Magnetic Particles:  Application for Switchable Electrochemistry

Katz, Eugenii; Sheeney-Haj-Ichia, Laila; Basnar, B.; Felner, I.; Willner, Itamar

doi:10.1021/la048476+

Cited by 68 publications

(83 citation statements)

References 36 publications

(19 reference statements)

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“…The droplet was equilibrated with the modified interface on the time scale of the experiment, and the derived contact angles reflected the equilibrium corresponding to the potential-controlled redox state of the modified surface. At an applied potential of 0.6 V, where the BDMT surface is functionalized with the Hg 2 + ions, the contact angle has a value in the region of (64 AE 3) 8. At an applied potential of 0.3 V, where the Hg + ions are linked to the monolayer interface, a somewhat lower contact angle, corresponding to (57 AE 1)8 is observed.…”

Section: à2mentioning

confidence: 98%

“…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. [5] Electrochemical, [6] photochemical, [7] magnetic, [8] chemical, [9] or biocatalytic [10] stimuli have been used to control the hydrophilic-hydrophobic properties of surfaces. For example, the electrical-field-induced bending of the negatively charged carboxylate unit tethered to a long alkyl chain on an electrode was used to control the hydrophilic-hydrophobic properties of a Au surface.…”

Section: Introductionmentioning

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: à2mentioning

confidence: 98%

Section: Introductionmentioning

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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“…Before the voltage was applied, the surface showed superhydrophobicity, but the liquid droplet spread out on the film when the applied voltage exceeded a threshold. Herein, it is worthy to note that similar to an electrical potential, a magnetic field [158] can also be a convenient method to control the surface wettability, and a magnetic superhydrophobic polyaniline nanofiber film has already been prepared via the EHD method in our lab.…”

Section: Electric-field Responsementioning

confidence: 99%

Design and Creation of Superwetting/Antiwetting Surfaces

2006

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Recent achievements in the construction of surfaces with special wettabilities, such as superhydrophobicity, superhydrophilicity, superoleophobicity, superoleophilicity, superamphiphilicity, superamphiphobicity, superhydrophobicity/superoleophilicity, and reversible switching between superhydrophobicity and superhydrophilicity, are presented. Particular attention is paid to superhydrophobic surfaces created via various methods and surfaces with reversible superhydrophobicity and superhydrophilicity that are driven by various kinds of external stimuli. The control of the surface micro‐/nanostructure and the chemical composition is critical for these special properties. These surfaces with controllable wettability are of great importance for both fundamental research and practical applications.

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“…Magnetic micro/nano-species discussed above demonstrated redox or electrocatalyticf eatures,t hus resultingi n the activation of electrochemicalr eactions,w hile being collected on an electrode surface.T he opposite effects of inhibiting electrochemical processesw ere obtained with hydrophobic magnetic nanoparticles collected on an electrode surface by applying externalm agnetic field [ 63,64]. Magnetic nanoparticles consisting of undecanoate-capped magnetite,F e 3 O 4 ,( average diameter ca.…”

Section: T Ranslocationofm Agnetic Hydrophobic Nanoparticles To and mentioning

confidence: 99%

Magneto‐switchable Electrodes and Electrochemical Systems

Katz

2015

Electroanalysis

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[a] 1IntroductionChemically modified electrodes [1] have been extensively developed from 1970-80s [2][3][4],m ostly for electrocatalytic applications.E xtending chemicals ystems associated with electrode surfaces to complexb iomolecular assemblies resulted in bioelectrocatalytic systems [5,6] particularly usedi ne lectrochemical biosensors [7][8][9] and biofuel cells [10][11][12].N ew applications required novel adaptive properties of electrochemicals ystems which have been realizedi nm odified electrodes functionalized with various signal-responsive materials [13,14] [29].I n the mosts ophisticated systems, the activity of switchable electrodes was controlled by complexm ulti-enzymes ystems,b eing reversibly activated-inactivated by various patterns of different biochemicals added to solutions [30][31][32],t hus mimickingb iological regulative and adaptive properties.F urther advances in the design of novel bioelectrochemical and bioelectronic systemsw ere achieved with the use of biomolecular-functionalized nano-species (nanoparticles,c arbon nanotubes,e tc.) [33][34][35].T he use of magnetic micro/nano-species( e.g.,n anoparticles,n anorods,n anosheets) [36][37][38][39][40]w as particularly important for the development of novel magneto-switchable electrodes with unique and unusual properties [25-28, 41, 42].Thep resent article overviews shortly various electrochemical systems with switchable features controlled by external magnetic field and basedo nm agnetic micro/ nano-species.A pplying magnetic field to magnetics pecies with redox, electrocatalytic or bioelectrocatalytic properties and moving them arounda llowed their different arrangements on electrode surfaces,t hus changing the electrochemical responses,s witchingt hem ON and OFF and resulting in many interestingf eatures.W hile the exact description of the exemplified systemsc an be found in the original research papers,the presentr ichly illustrated article aims at the concept explanationst os ummarize the fieldd evelopments up to date. 2Lateral TranslocationofM agnetic Micro/NanoSpecies on Electrodes and Electrode ArraysOne of the first examplesofthe magneto-switchable bioelectrochemicals ystems was basedo nalateralt ranslocation of DNA-functionalized magnetic microspheres (super-paramagnetic polystyrene beads,c a. 1 mm, with included Fe 3 O 4 nanoparticles) alonga ne lectrodea rray composed of two conducting areas ("left"a nd "right" electrodes), both with the applied potential capable of oxidizing DNAm olecules [43],F igure1.T he magnetic microspheres chemically modified with DNAo ligomers (GGC CGA CTC ACTG CG CGT CTT CTG TCC CGC Abstract:T his article is an overview of extensive research efforts in many laboratories in the last two decades in the area of magneto-switchable electrochemicals ystems. Electrochemical reactions, including electrocatalytic and bioelectrocatalytic processes,h ave been reversibly activated and inhibited upon physical translocation and reorientation of differentm agnetic micro/nano-species on electrode surfaces,p artic...

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Magnetoswitchable Controlled Hydrophilicity/Hydrophobicity of Electrode Surfaces Using Alkyl-Chain-Functionalized Magnetic Particles: Application for Switchable Electrochemistry

Cited by 68 publications

References 36 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

Design and Creation of Superwetting/Antiwetting Surfaces

Magneto‐switchable Electrodes and Electrochemical Systems

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