What Really Drives Chemical Reactions on Contact Charged Surfaces?

Baytekin, Bilge; Baytekin, H. Tarık; Grzybowski, Bartosz A.

doi:10.1021/ja300925h

Cited by 112 publications

(114 citation statements)

References 53 publications

(32 reference statements)

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“…In addition, even though the SAM had identical functional group, the carbon chain length of the SAM was also a factor affecting triboelectrification owing to the formation of radicals along the carbon chains ( Figure S3, Supporting Information). 30 To elucidate the triboelectrification process on the SAM-modified SiO 2 surfaces, the surface dipole and surface states induced by the SAMs were estimated using first-principles method. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 8 approximately 5.5 eV in the gap, which further modify its surface potential.…”

Section: Resultsmentioning

confidence: 99%

Control of Triboelectrification by Engineering Surface Dipole and Surface Electronic State

Byun

Cho

Seol

et al. 2016

ACS Appl. Mater. Interfaces

101

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Although triboelectrification is a well-known phenomenon, fundamental understanding of its principle on a material surface has not been studied systematically. Here, we demonstrated that the surface potential, especially the surface dipoles and surface electronic states, governed the triboelectrification by controlling the surface with various electron-donating and -withdrawing functional groups. The functional groups critically affected the surface dipoles and surface electronic states followed by controlling the amount of and even the polarity of triboelectric charges. As a result, only one monolayer with a thickness of less than 1 nm significantly changed the conventional triboelectric series. First-principles simulations confirmed the atomistic origins of triboelectric charges and helped elucidate the triboelectrification mechanism. The simulation also revealed for the first time where charges are retained after triboelectrification. This study provides new insights to understand triboelectrification.

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Section: Resultsmentioning

confidence: 99%

Control of Triboelectrification by Engineering Surface Dipole and Surface Electronic State

Byun

Cho

Seol

et al. 2016

ACS Appl. Mater. Interfaces

101

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“…14 nC cm -2 (3 µm diameter meniscus footprint), consistent with the values found using bulk measurements using a Faraday cup. 39 Control measurements at an uncharged Teflon surface (red line, Figure 4B) did not show any detectable change in the electrochemical current upon contact. The local point measurements shown here could be extended in the future for surface mapping of charged insulators, particularly as charge heterogeneities might be expected across the surface as implied from heterogeneous metal deposits.…”

Section: +mentioning

confidence: 88%

Quad-Barrel Multifunctional Electrochemical and Ion Conductance Probe for Voltammetric Analysis and Imaging

et al. 2015

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(2015) QuadBarrel multifunctional electrochemical and ion conductance probe for voltammetric analysis and imaging. Analytical Chemistry, Volume 87 (Number 7). pp. 3566-3573. Permanent WRAP url: http://wrap.warwick.ac.uk/67813 Copyright and reuse:The Warwick Research Archive Portal (WRAP) makes this work of researchers of the University of Warwick available open access under the following conditions. Copyright © and all moral rights to the version of the paper presented here belong to the individual author(s) and/or other copyright owners. To the extent reasonable and practicable the material made available in WRAP has been checked for eligibility before being made available.Copies of full items can be used for personal research or study, educational, or not-forprofit purposes without prior permission or charge. Provided that the authors, title and full bibliographic details are credited, a hyperlink and/or URL is given for the original metadata page and the content is not changed in any way. Publisher's statement:This document is the Accepted Manuscript version of a Published Work that appeared in final form in Analytical Chemistry, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work, see http://pubs.acs.org/page/policy/articlesonrequest/index.html] The version presented here may differ from the published version or, version of record, if you wish to cite this item you are advised to consult the publisher's version. Please see the 'permanent WRAP url' above for details on accessing the published version and note that access may require a subscription. ABSTRACTThe fabrication and use of a multifunctional electrochemical probe incorporating two independent carbon working electrodes and two electrolyte-filled barrels, equipped with quasi-reference counter electrodes (QRCEs), in the end of a tapered micron-scale pipet is described. This 'quad-probe' (4-channel probe) was fabricated by depositing carbon pyrolytically into two diagonally opposite barrels of a laser-pulled quartz quadruple-barrelled pipet. After filling the open channels with electrolyte solution, a meniscus forms at the end of the probe and covers the two working electrodes. The two carbon electrodes can be used to drive local electrochemical reactions within the meniscus while a bias between the QRCEs in the electrolyte channels provides an ion conductance signal that is used to control and position the meniscus on a surface of interest. When brought into contact with a surface, localized high resolution amperometric imaging can be achieved with the two carbon working electrodes with a spatial resolution defined by the meniscus contact area. The substrate can be an insulating material or (semi)conductor, but herein we focus mainly on conducting substrates that can be connected as a third working electrode. Studies using both aqueous and ionic liquid electrolytes in the probe, together with gold and individual single walled carbon nanotube samples, demonstrate...

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“…5a, point 0). During the first contact, charges are created bipolarly (conserving the total charge as, X + = Y − + e − , X and Y mechanoions, e − free electrons) at the polymer/metal interface because of the bond-breaking processes on the polymer’s surface as was previously verified in the literature 17,18,26,31,36 . 36 and also in Fig.…”

Section: Resultsmentioning

confidence: 66%

“…Based on these new findings, it was proposed that the charge generation is closely related to mechanically generated chemical species; radicals, cations, and anions formed after bond-breakages on surfaces 17,26–31 . Also, three fundamental transfer processes, electron 32,33 , ion 16,34,35 , and material transfer 11,12 are now reconsidered in terms of bond-breaking upon plastic deformations 31,36–38 . Some groups further investigated the chemical events on tribocharged surfaces such as surface-modifications 39,40 , different types of bond-breaking processes 26–30 , and other chemical changes like surface oxidation, showing their role in contact electrification 37 .…”

Section: Introductionmentioning

confidence: 99%

The Charging Events in Contact-Separation Electrification

Umar

Cezan

Baytekin

et al. 2018

Sci Rep

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Contact electrification (CE)—charging of surfaces that are contacted and separated, is a common phenomenon, however it is not completely understood yet. Recent studies using surface imaging techniques and chemical analysis revealed a ‘spatial’ bipolar distribution of charges at the nano dimension, which made a paradigm shift in the field. However, such analyses can only provide information about the charges that remained on the surface after the separation, providing limited information about the actual course of the CE event. Tapping common polymers and metal surfaces to each other and detecting the electrical potential produced on these surfaces ‘in-situ’ in individual events of contact and separation, we show that, charges are generated and transferred between the surfaces in both events; the measured potential is bipolar in contact and unipolar in separation. We show, the ‘contact-charges’ on the surfaces are indeed the net charges that results after the separation process, and a large contribution to tribocharge harvesting comes, in fact, from the electrostatic induction resulting from the generated CE charges. Our results refine the mechanism of CE providing information for rethinking the conventional ranking of materials’ charging abilities, charge harvesting, and charge prevention.

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What Really Drives Chemical Reactions on Contact Charged Surfaces?

Cited by 112 publications

References 53 publications

Control of Triboelectrification by Engineering Surface Dipole and Surface Electronic State

Control of Triboelectrification by Engineering Surface Dipole and Surface Electronic State

Quad-Barrel Multifunctional Electrochemical and Ion Conductance Probe for Voltammetric Analysis and Imaging

The Charging Events in Contact-Separation Electrification

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