Electrochemical modification of carbon electrode with benzylphosphonic groups

Benjamin, Ossonon Diby; Weissmann, Martin; Bélanger, Daniel

doi:10.1016/j.electacta.2013.10.135

Cited by 10 publications

(2 citation statements)

References 29 publications

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“…It should be noted that the ionic strength used in this dye adsorption assay was higher than in the assay used to determine functional group density, and the two resulting measurements are not directly comparable as a result. The p K a values of the starting compounds are listed in Table S1 to give a general idea of the pH ranges where the functional groups may be charged, but these values could shift upon anchorage to the surface. , The NH 2 surfaces were positively charged only at pH 3, which correlated with a p K a of 4.2 for the NH 2 groups on PDD. The COOH surfaces were slightly charged at pH 7 (not significant compared to uncharged NH 2 ) and fully charged at pH 11, which correlated with the p K a of 4.8 for the COOH groups of PABA.…”

Section: Resultsmentioning

confidence: 97%

Protein Adsorption on Surfaces Functionalized with COOH Groups Promotes Anti-inflammatory Macrophage Responses

Buck

Lee

Stone

et al. 2021

ACS Appl. Mater. Interfaces

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Implants can induce a foreign body reaction that leads to chronic inflammation and fibrosis in the surrounding tissue. Macrophages help detect the foreign material, play a role in the inflammatory response, and may promote fibrosis instead of the desired tissue regeneration around implants. Implant surface properties impact macrophage responses by changing the nature of the adsorbed protein layer, but conflicting studies highlight the complexity of this relationship. In this study, the effect of surface chemistry on macrophage behavior was investigated with poly(styrene) surfaces containing common functional groups at similar surface densities. The protein layer was characterized to identify the proteins that adsorbed on the surfaces from the medium and the proteins secreted onto the surfaces by adherent macrophages. Of the surface chemistries studied, carboxylic acid (COOH) groups promoted anti-inflammatory responses from unstimulated macrophages and did not exacerbate inflammation upon stimulation. These surfaces also enhanced the adsorption of proteins involved in integrin signaling and promoted the secretion of proteins related to angiogenesis, integrin signaling, and cytokine signaling, which have been previously associated with improved biomaterial integration. Therefore, this study suggests that surface modification with COOH groups may help improve the integration of implants in the body by enhancing anti-inflammatory macrophage responses through altered protein adsorption.

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Section: Resultsmentioning

confidence: 97%

Protein Adsorption on Surfaces Functionalized with COOH Groups Promotes Anti-inflammatory Macrophage Responses

Buck

Lee

Stone

et al. 2021

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…Impedance electrochemical spectra was then used in this work because it was shown particularly efficient in the characterization of all phenylene layers grafted via the diazonium chemistry. , Impedance electrochemical spectroscopy also provides a good understanding of the blocking effect, thus the resistance against corrosion, which is the main target of the last section.…”

Section: Resultsmentioning

confidence: 99%

Covalent Grafting of Chitosan onto Stainless Steel through Aryldiazonium Self-Adhesive Layers

Doan

Dequivre

et al. 2014

ACS Appl. Mater. Interfaces

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Although the conventional methods for strong attachment of chitosan onto stainless steel require many steps in different solvents, it has been demonstrated in this work that covalent grafting of chitosan on a steel surface can be easily achieved through the formation of a self-adhesive surface based on aryldiazonium seed layers. Initially, a polyaminophenyl layer is grafted on a stainless steel surface by means of the one-step GraftFast(TM) process (diazonium induced anchoring process). The grafted aminophenyl groups are then converted to an aryldiazonium seed layer by simply dipping the substrate in a sodium nitrite acidic solution. That diazonium-rich grafted layer can be used as a self-adhesive surface for subsequent spontaneous coating of chitosan onto the steel surface. X-ray photoelectron and impedance electrochemical spectroscopies were used to characterize the pristine and modified steel samples. As evidenced from impedance and linear polarization results, the primary polyaminophenyl layer characterized by a high charge transfer resistance contributed to better protection against corrosion of the resulting chitosan-coated steel in sulfuric acid medium.

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Grafting of Aminoethylphosphonic Acid Monolayers on Titanium Nitride: The Effect of Surface Pretreatments through Electrochemical‐Assisted Oxidation

Zeb

2016

Adv Materials Inter

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The surface of titanium nitride (TiN) contains, in addition to nitride compounds, a certain amount of native oxide. This oxide allows the functionalization of TiN with amine‐terminated groups through spontaneous self‐assembly of aminoethylphosphonic acid. However, real industrial applications of titanium nitride, particularly for microelectronics and electrochemistry, require the development of efficient methods to improve the aminoethylphosphonate loading while preserving the main intrinsic characteristics of the TiN substrate. It is demonstrated that surface pretreatment, by either electrochemical anodization or cleaning in H2O2:HCl:H2O mixture, considerably enhances the phosphonic loading. This is the first report on mild oxidation of TiN surface using an acidic peroxide mixture. This electrochemical‐assisted method does not require any electrochemical equipment, and works through simple immersion of the TiN surface in the cleaning solution at room temperature. Moreover, cleaning in this solution leads to a significantly increased quantity of the grafted phosphonate groups via uniform hydroxylation of the entire surface, without altering the behavior of the pristine TiN. The electrochemical anodization technique, which results in quasicomplete conversion of surface TiN compounds to TiO2 under our working conditions, needs further fundamental investigation towards incorporation of oxygen into the TiN lattice.

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Electrochemical modification of carbon electrode with benzylphosphonic groups

Cited by 10 publications

References 29 publications

Protein Adsorption on Surfaces Functionalized with COOH Groups Promotes Anti-inflammatory Macrophage Responses

Protein Adsorption on Surfaces Functionalized with COOH Groups Promotes Anti-inflammatory Macrophage Responses

Covalent Grafting of Chitosan onto Stainless Steel through Aryldiazonium Self-Adhesive Layers

Grafting of Aminoethylphosphonic Acid Monolayers on Titanium Nitride: The Effect of Surface Pretreatments through Electrochemical‐Assisted Oxidation

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