Surface charge properties of oxides and hydroxides formed on metal substrates determined by contact angle titration

Chvedov, D.; Logan, Elizabeth L.B

doi:10.1016/j.colsurfa.2004.03.022

Cited by 15 publications

(9 citation statements)

References 22 publications

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“…5. At the isoelectric point the contact angle shows a maximum which is qualitatively in line with observations made in the literature [1,2,4,3,28,5,6]. The contact angle at the isoelectric point is h i.e.p.…”

Section: Resultssupporting

confidence: 86%

Development of diffuse double layers in column-wicking experiments: Implications for pH-dependent contact angles on quartz

Weber

Stanjek

2012

Journal of Colloid and Interface Science

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Section: Resultssupporting

confidence: 86%

Development of diffuse double layers in column-wicking experiments: Implications for pH-dependent contact angles on quartz

Weber

Stanjek

2012

Journal of Colloid and Interface Science

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“…Employing test solutions with different pH also allows the IEP of a surface to be determined as changes in surface charge density control the contact angle of a surface. As previously discussed,2, 3, 7, 34–36 a maximum in contact angle occurs at the point of zero surface charge. Here, we plotted the measured contact angle as a function of the pH of the test liquid, and fit the data with a second‐order polynomial to determine the maximum contact angle, and thus the IEP for the untreated and treated surfaces.…”

Section: Methodsmentioning

confidence: 53%

Isoelectric points of plasma‐modified and aged silicon oxynitride surfaces measured using contact angle titrations

Trevino

Shearer

McCurdy

et al. 2010

Surface & Interface Analysis

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Acid-base properties of metal oxides and polymers can control adhesion properties between materials, electrical properties, the physical structure of the material and gas adsorption behavior. To determine the relationships between surface isoelectric point, chemical composition and aging effects, plasma-surface treatment of amorphous silicon oxynitride (SiO x N y ) substrates was explored using Ar, H 2 O vapor, and NH 3 inductively coupled rf plasmas. Overall, the Ar plasma treatment resulted in nonpermanent changes to the surface properties, whereas the H 2 O and NH 3 plasmas introduced permanent chemical changes to the SiO x N y surfaces. In particular, the H 2 O plasma treatments resulted in formation of a more ordered SiO 2 surface, whereas the NH 3 plasma created a nitrogen-rich surface. The trends in isoelectric point and chemical changes upon aging for one month suggest that contact angle and composition are closely related, whereas the relationship between IEP and composition is not as directly correlated.

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“…On the other hand, zeta potential measurements on solid surfaces are less usual. Contact angle titatration has been proposed for the evaluation of the isoelectric point of solid samples (Chedov and Logan, 2004), but the result is limited to the IEP value and measurements are quite complex with consequent difficulties in the obtainment of reliable results (Spriano et al, 2017). Electrokinetic measurements of the zeta potential of solid surfaces can be more interesting for the determination of both the IEP value and also of the zeta potential in function of pH, making possible a more in depth understanding of surface properties (Cai et al, 2006; Luxbacher, 2014; Spriano et al, 2017).…”

Section: Discussionmentioning

confidence: 99%

Zeta Potential Measurements on Solid Surfaces for in Vitro Biomaterials Testing: Surface Charge, Reactivity Upon Contact With Fluids and Protein Absorption

Ferraris

Cazzola

Peretti

et al. 2018

Front. Bioeng. Biotechnol.

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Surface properties of biomaterials (e.g., roughness, chemical composition, charge, wettability, and hydroxylation degree) are key features to understand and control the complex interface phenomena that happens upon contact with physiological fluids. Numerous physico-chemical techniques can be used in order to investigate in depth these crucial material features. Among them, zeta potential measurements are widely used for the characterization of colloidal suspensions, but actually poorly explored in the study of solid surfaces, even if they can give significant information about surface charge in function of pH and indirectly about surface functional groups and reactivity. The aim of the present research is application of zeta potential measurements of solid surfaces for the in vitro testing of biomaterials. In particular, bare and surface modified Ti6Al4V samples have been compared in order to evaluate their isoelectric points (IEPs), surface charge at physiological pH, in vitro bioactivity [in simulated body fluid (SBF)] and protein absorption. Zeta potential titration was demonstrated as a suitable technique for the surface characterization of surface treated Ti6Al4V substrates. Significant shift of the isoelectric point was recorded after a chemical surface treatment (because of the exposition of hydroxyl groups), SBF soaking (because of apatite precipitation IEP moves close to apatite one) and protein absorption (IEP moves close to protein ones). Moreover, the shape of the curve gives information about exposed functional groups (e.g., a plateau in the basic range appears due to the exposition of acidic OH groups and in the acidic range due to exposition of basic NH2 groups).

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Surface charge properties of oxides and hydroxides formed on metal substrates determined by contact angle titration

Cited by 15 publications

References 22 publications

Development of diffuse double layers in column-wicking experiments: Implications for pH-dependent contact angles on quartz

Development of diffuse double layers in column-wicking experiments: Implications for pH-dependent contact angles on quartz

Isoelectric points of plasma‐modified and aged silicon oxynitride surfaces measured using contact angle titrations

Zeta Potential Measurements on Solid Surfaces for in Vitro Biomaterials Testing: Surface Charge, Reactivity Upon Contact With Fluids and Protein Absorption

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