THE INFERENCE OF ADSORPTION FROM DIFFERENTIAL DOUBLE LAYER CAPACITANCE MEASUREMENTS. II. DEPENDENCE OF SURFACE CHARGE DENSITY ON ORGANIC NONELECTROLYTE SURFACE EXCESS<sup>1,2</sup>

Hansen, Robert S.; Kelsh, D.J.; Grantham, D. H.

doi:10.1021/j100805a015

Cited by 74 publications

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“…The voltage trend, while not perfectly reproduced in either the PB or SMPB model, exhibits the familiar camel shape and decrease with respect to frequency. [31,32]. A more thorough treatment of steric effects is needed to account for multi-ion correlation as modifications in the Poisson and transport equations.…”

Section: Discussionmentioning

confidence: 99%

Critical Assessment on Modeling and Design of Nonfaradaic CMOS Electrochemical Sensing

et al. 2016

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To assist the design process of non-Faradic electrochemical sensors in realistic biological media, we examine multiple types of sensing operations in polyelectrolytes. By comparing the quasi-static transconductance, impedance spectroscopy, and capacitance-voltage (CV) measurements, we assess the physical contributions from the double layer composition, overall solution resistance, and sensing surface potential under various poly-electrolytic molarities. The mixture of NaCl and MgCl 2 is chosen for illustration to provide insight into circuit model parameters for non-Faradaic sensing. Our finding also shed light on the dynamics of double-layer competition and correlation, which is critical for understanding the physical phenomena occurring at the sensing interface, and accurately interpreting sensor data.

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Section: Discussionmentioning

confidence: 99%

Critical Assessment on Modeling and Design of Nonfaradaic CMOS Electrochemical Sensing

et al. 2016

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“…E plotted for various adsorbate concentrations have the shape of an inverted parabola, and reveal that the interfacial tension decreases over a wide potential range on both sides of the pzc (e.g., 31 ). For organic substances the Y-E curve is progressively lowered, over a wide potential range, as the adsorbate concentration increases (e.g., 32 ), in analogy to capacitance depression. For inorganic anions the corresponding effect is an increase in surface tension with increasing adsorbate concentration (e.g., 33 ).…”

Section: A(drop Time) Electrosorptive Detectionmentioning

confidence: 99%

Instrumental Methods for Electrosorptive Detection in Liquid Chromatography

Ramstad¹,

Milner²

1989

Instrumentation Science & Technology

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Techniques and instrumentation have been developed for the electrosorptive detection of selected anions at mercury and silver in ion chromatography and of surface-active organic substances at mercury. Detection based on differential double-layer capacitance has proven most generally useful, although pulsebased methods are also beneficial, especially at silver where they have special utility in countering adsorption effects. An ancillary, and more specialized technique developed for the determination of ions senses adsorption, indirectly, relying on the kinetic facilitation imparted the rate of electroreduction of a transition-metal reactant by an adsorbed species. A less generally useful, but nevertheless complementary scheme based on the "tensammetric" peak may also be employed for the determination of organic species. A novel approach investigated for application Present address: The Upjohn Company, Kalamazoo, Michigan Present address: Isco Inc., Lincoln, Nebraska r 148 RAMSTAD AND MILNER to both ionic and neutral species is based on changes in the drop time of mercury caused by adsorption-induced changes in surface tension at the mercury/aqueous interface. Finally, more elaborate, "hyphenated" techniques -capacitive/capacitive and capacitive/amperometric detection -have also been developed for application to selected ions.

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“…The development of a method for studying liquid-liquid interfaces obviously necessitates the choice of an interfacial system for experimentation. A liquid-liquid interface which has previously received much attention (1,7,8,10,11,15,20,23,26,27,(30)(31)(32)(33)(51)(52)(53)(54)(55)(56)(57), and is of interest because of its unique properties is the interface between an aqueous electrolyte solution, containing a surfactant and mercury.…”

Section: Please Notementioning

confidence: 99%

“…Another The interface between electrolyte solutions and mercury has long been investigated by chemists and physicists (1,1,8,10,11,15,20,23,25,27,30,32,33,40,41,(51)(52)(53)(54)(55)(56)(57). Excellent reviews are available summarizing these investigations (10,20).…”

Section: Intermediate Surface Behaviormentioning

confidence: 99%

“…Now we have a simple model for the surface tension behavior during changes in polarization. This simple model is at best approximate for a system in which no adsorption occurs, but may be suitable for treatment of the zero elasticity limiting behavior of interfacial ripples (where again surfactant is absent), Adsorption at the aqueous solution-mercury interface has been shown to be potential dependent (10,11,20,23,26,27,30,32). This implies that the surface coverage and elastic modulus will change with the polarization of the interface.…”

Section: Ecmmentioning

confidence: 99%

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Propagation characteristics of interfacial ripples at the polarized aqueous solution-mercury interface

Bierwagen

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1968Signature was redacted for privacy.Signature was redacted for privacy.Signature was redacted for privacy. 15 4 3 2 , A.K +A_K +A_K +A,K+A^ E = -J --i ± y.) (45) K CgK +C2K +C,K+Cq with the coefficients Ai and Ci defined as follows; = -ito (p+p') (ym+y'ra') / A^ = [4yy'mm'-iw(y+y')(p+p')], A^ = 4(y^m+y ^m ), A^ = [4yy'+ i^(y'm'+ym) ] , ^4 = CQ = (p+p'), Ci = i(y'm'+ym), C; = ^^W+V'), and 2 C3 = -Y/O) . This formula involves no approximations, and covers the entire range of E. Let us consider equation 44 for the case E-»-N, and solve the equation for y. This leads to the following formula : GVAL GVAL (see Figure 5, Appendix B) was written to generate interfacial tension values at arbitrary voltages from coefficients of a polynomial fit to electrocapillary curves produced by a program, ECl, written by D. Broadhead^. The procedure used was to input interfacial tensionvoltage values into ECl, and then take the polynomial fit from this program into GVAL, which will then calculate Y values at any voltage desired. The program was written because some of the reference interfacial tension values were measured at 100 mv. intervals, while during much of the interfacial ripple experimentation, the data were measured at 25 mv. intervals. CALB CALB (see Figure 6, Appendix B) was programmed to fit the ripple generator amplitude response at constant electrical input-frequency data, and to generate coefficients from this fit. The main purpose of the program was to catalogue and arrange amplitude-frequency data to be fed into sub routine OPLSPA. This subroutine, available at the ISU computer library, is written to take an array of dependent ^D. Brcadhead, unpublished results.

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THE INFERENCE OF ADSORPTION FROM DIFFERENTIAL DOUBLE LAYER CAPACITANCE MEASUREMENTS. II. DEPENDENCE OF SURFACE CHARGE DENSITY ON ORGANIC NONELECTROLYTE SURFACE EXCESS^1,2

Cited by 74 publications

References 0 publications

Critical Assessment on Modeling and Design of Nonfaradaic CMOS Electrochemical Sensing

Critical Assessment on Modeling and Design of Nonfaradaic CMOS Electrochemical Sensing

Instrumental Methods for Electrosorptive Detection in Liquid Chromatography

Propagation characteristics of interfacial ripples at the polarized aqueous solution-mercury interface

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THE INFERENCE OF ADSORPTION FROM DIFFERENTIAL DOUBLE LAYER CAPACITANCE MEASUREMENTS. II. DEPENDENCE OF SURFACE CHARGE DENSITY ON ORGANIC NONELECTROLYTE SURFACE EXCESS1,2

Cited by 74 publications

References 0 publications

Critical Assessment on Modeling and Design of Nonfaradaic CMOS Electrochemical Sensing

Critical Assessment on Modeling and Design of Nonfaradaic CMOS Electrochemical Sensing

Instrumental Methods for Electrosorptive Detection in Liquid Chromatography

Propagation characteristics of interfacial ripples at the polarized aqueous solution-mercury interface

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THE INFERENCE OF ADSORPTION FROM DIFFERENTIAL DOUBLE LAYER CAPACITANCE MEASUREMENTS. II. DEPENDENCE OF SURFACE CHARGE DENSITY ON ORGANIC NONELECTROLYTE SURFACE EXCESS^1,2