Electrochemical Deposition of Polyelectrolytes Is Maximum at the Potential of Zero Charge

Moore, David C.; Arcila, Jennifer A.; Saraf, Ravi F.

doi:10.1021/acs.langmuir.9b03734

Cited by 3 publications

(6 citation statements)

References 59 publications

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“…The difference in the FL before contact is the PZC. 43,45 (ii) As the Au electrode is immersed in the buffer solution containing ssDNA probe with MB, the FL of the electrode rises by accumulating negative charge. 45 Owing to their higher concentration and mobility, the buffer anions accumulate more to bring the FL to equilibrium.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…43,45 (ii) As the Au electrode is immersed in the buffer solution containing ssDNA probe with MB, the FL of the electrode rises by accumulating negative charge. 45 Owing to their higher concentration and mobility, the buffer anions accumulate more to bring the FL to equilibrium. As a result, even though the negatively charged tethered ssDNA probes are in the vicinity, most of them will stand up as the FL is already in equilibrium due to the anions from the buffer.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…For convenience, the buffer is grounded, which is typically the case in electrochemical measurements (Figure a): (i) before contact, the FL of Au is lower due its high work function. The difference in the FL before contact is the PZC. , (ii) As the Au electrode is immersed in the buffer solution containing ssDNA probe with MB, the FL of the electrode rises by accumulating negative charge . Owing to their higher concentration and mobility, the buffer anions accumulate more to bring the FL to equilibrium.…”

Section: Resultsmentioning

confidence: 99%

“…For E > 0, past the PZC (i.e., E > ϕ), the electrode will move down shedding all the anions and consequently repelling the ssDNA probe to stand up. As a result, with the PZC for the Au electrode at ∼+0.3 V relative to Ag/AgCl, , the probes will stand up.…”

Section: Resultsmentioning

confidence: 99%

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Electrochemical Beacon Method to Quantify 10 Attomolar Nucleic Acids with a Semilog Dynamic Range of 7 Orders of Magnitude

Tevatia¹,

Chan²,

Oltmanns³

et al. 2021

Anal. Chem.

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Change in the dynamics of single-stranded DNA or RNA probes tethered to an Au electrode on immunospecific binding to the analyte is a versatile approach to quantify a variety of molecules, such as heavy metal ions, pesticides, proteins, and nucleic acids (NAs). A widely studied approach is the electrochemical beacon method where the redox of a dye attached to the probe decreases as its proximity to the underlying electrode changes on binding. The limit of quantification (LOQ) defined by the semilog dependence of the signal on target concentration is in the picomolar range. Here, a method was studied where, by differential reflectivity, multiple reactions were measured on a monolith electrode. An alternative contrast mechanism was discovered, which led to an approach to enhance the LOQ to 10 aM and increase the dynamic range to 7 orders of magnitude using similar probes and binding conditions. Quantitative analysis on sequences with the G−C fraction ranging from 37 to 72% was performed. The approach will allow for the development of a label-free, enzyme-free microarray to detect biomolecules including NAs and proteins on a single electrode at quantification from 10 aM to 0.1 nM with high specificity.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Electrochemical Beacon Method to Quantify 10 Attomolar Nucleic Acids with a Semilog Dynamic Range of 7 Orders of Magnitude

Tevatia¹,

Chan²,

Oltmanns³

et al. 2021

Anal. Chem.

Self Cite

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“…Salt is used to weaken charge–charge interactions, whether by a site-specific mechanism or by electrostatic screening. Unlike the adsorption of ions, polyelectrolytes often display an increase, then a decrease, in thickness/adsorbed amounts with increasing [salt]. − This complex response to [salt], modeled in various theories, ,, is an example of adsorbed amounts of polymer counterintuitively increasing with weaker interactions. − …”

Section: Introductionmentioning

confidence: 99%

Relative Strength of Polycation Adsorption on Oxide Surfaces

Akintola,

Abou Shaheen,

et al. 2024

Langmuir

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Polyelectrolyte adsorption onto surfaces is widely employed in water treatment and mining. However, little is known of the relative interaction strengths between surfaces and polymer. This fundamental property is assumed to be dominated by electrostatics, i.e., attractive interactions between opposite charges, which are set by the overall ionic strength ("salt concentration") of the solution, and charge densities of the surface and the polymer. A common, counterintuitive finding is a range of salt concentrations over which the amount of adsorbed polyelectrolyte increases as electrostatic interactions are tempered by the addition of salt. After an adsorption maximum, higher salt concentrations then produce the expected gradual desorption of polyelectrolyte. In this work, the salt response of the adsorption of the same narrow molecular weight distribution polycation, poly(N-methyl-4-vinylpyridinium), PM4VP, to a variety of surfaces was explored. Oxide powders for adsorption included Al 2 O 3 , SiO 2 , Fe 2 O 3 , Fe 3 O 4 , TiO 2 , ZnO, and CuO. Planar surfaces included silicon wafers, mica, calcium carbonate, and CaF 2 single crystals. The PM4VP was radiolabeled with 14 C so that sensitive, submonolayer amounts could be detected. The position of the peak maximum, or the lack of a peak, in response to added salt was used to rank the electrostatic component of the interaction. The importance of charge regulation, a shift in the surface pK a in response to solution species, was highlighted as a mechanism for adsorption on the "wrong" side of the isoelectric point and also as a factor contributing to the difficulty of reaching the totally desorbed state even at the highest salt concentrations.

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Thin Protective Coatings on Metals Formed by Organic Corrosion Inhibitors in Neutral Media

Kuznetsov

Redkina

2022

Coatings

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Protection of metals in neutral media with pH 5.0–9.0 (in humid atmospheres and various aqueous solutions) can be achieved by formation of thin coatings (up to several tens of nm) on their surfaces due to adsorption and more complex chemical interactions of organic corrosion inhibitors (OCIs) with the metal to be protected. The review contains three sections. The first section deals with coatings formed in aqueous solutions, while the second one, with those formed in organic and water-organic solvents. Here we consider metal protection by coatings mainly formed by the best-known classes of OCI (carboxylates, organophosphates and phosphonates) and estimation of its efficiency. The third section discusses the peculiarities of protection of metals in the vapor-gas phase, i.e., by volatile OCIs, and a relatively new type of metal protection against atmospheric corrosion by the so-called chamber inhibitors. OCIs with relatively low volatility under normal conditions can be used as chamber OCIs. To obtain a protective coating on the surfaces of metal items, they are placed in a chamber inside which an increased concentration of vapors of a chamber OCI is maintained by increasing the temperature. This review mainly focuses on the protection of iron, steels, copper and zinc.

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Electrochemical Deposition of Polyelectrolytes Is Maximum at the Potential of Zero Charge

Cited by 3 publications

References 59 publications

Electrochemical Beacon Method to Quantify 10 Attomolar Nucleic Acids with a Semilog Dynamic Range of 7 Orders of Magnitude

Electrochemical Beacon Method to Quantify 10 Attomolar Nucleic Acids with a Semilog Dynamic Range of 7 Orders of Magnitude

Relative Strength of Polycation Adsorption on Oxide Surfaces

Thin Protective Coatings on Metals Formed by Organic Corrosion Inhibitors in Neutral Media

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