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Publication

Adsorption of BSA on Passivated CoCrMo PVD Alloy: An EQCM and XPS Investigation

Stefano Mischler, Anna Neus Igual Muñoz
2014
Journal Articles

Abstract

Adsorption of Bovine Serum Albumin (BSA) on an anodically passivated CoCrMo biomedical alloy has been studied using the Electrochemical Quartz Crystal Microbalance (EQCM) in phosphate buffer solution at 37 degrees C. CoCrMo layers were deposited on the quartz crystals by physical vapor deposition. EQCM measurements were performed under potentiostatic conditions and combined with X-ray Photoelectron Spectroscopy (XPS) analysis. Adsorption of BSA onto the CoCrMo alloy surface was found to favor passive dissolution without modification of the chemical composition and thickness of the oxide passive film. In addition, passive film growth and adsorption kinetics of the protein follow a logarithmic trend. Both EQCM and XPS techniques demonstrated that protein coverage depends on the applied potential. (C) 2014 The Electrochemical Society. All rights reserved.

Official source

https://infoscience.epfl.ch/entities/publication/a8a6233e-1736-4ca4-9d65-e939feadc2c2

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Stefano Mischler, Anna Neus Igual Muñoz
2014
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/a8a6233e-1736-4ca4-9d65-e939feadc2c2

About this result

Related concepts (32)

Quartz crystal microbalance

A quartz crystal microbalance (QCM) (also known as quartz microbalance (QMB), sometimes also as quartz crystal nanobalance (QCN)) measures a mass variation per unit area by measuring the change in frequency of a quartz crystal resonator. The resonance is disturbed by the addition or removal of a small mass due to oxide growth/decay or film deposition at the surface of the acoustic resonator. The QCM can be used under vacuum, in gas phase ("gas sensor", first use described by King) and more recently in liquid environments.

Passivation (chemistry)

In physical chemistry and engineering, passivation is coating a material so that it becomes "passive", that is, less readily affected or corroded by the environment. Passivation involves creation of an outer layer of shield material that is applied as a microcoating, created by chemical reaction with the base material, or allowed to build by spontaneous oxidation in the air. As a technique, passivation is the use of a light coat of a protective material, such as metal oxide, to create a shield against corrosion.

Crystal oscillator

A crystal oscillator is an electronic oscillator circuit that uses a piezoelectric crystal as a frequency-selective element. The oscillator frequency is often used to keep track of time, as in quartz wristwatches, to provide a stable clock signal for digital integrated circuits, and to stabilize frequencies for radio transmitters and receivers. The most common type of piezoelectric resonator used is a quartz crystal, so oscillator circuits incorporating them became known as crystal oscillators.

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Adsorption of BSA on Passivated CoCrMo PVD Alloy: An EQCM and XPS Investigation

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