Determination of surface zeta-potential and isoelectric point of carbon surfaces using tracer particle suspensions

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F17%3A00506639" target="_blank" >RIV/61388955:_____/17:00506639 - isvavai.cz</a>

Result on the web

<a href="http://hdl.handle.net/11104/0297846" target="_blank" >http://hdl.handle.net/11104/0297846</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/sia.6223" target="_blank" >10.1002/sia.6223</a>

Result language

angličtina

Original language name

Determination of surface zeta-potential and isoelectric point of carbon surfaces using tracer particle suspensions

Original language description

Carbon materials are widely used in a range of applications from biomaterials to sensing and electronics. Many of these applications rely on the ability to control carbon/water interfacial properties, in particular, surface charge density. This work reports a study of the electrokinetic properties of amorphous carbon thin films as a function of pH and surface chemistry. Surface zeta-potential (SZP) and isoelectric point were determined using the tracer particle method. Initially, the use of sulfonated and amine-terminated latex bead suspensions as tracer particles for the determination of SZP of reference polymer surfaces was validated. The tracer particle method was then applied to the determination of SZP and isoelectric point of macroscopic carbon surfaces with different surface chemistry. Highly graphitic and sp(3)-rich hydrogenated carbon surfaces were found to display negative SZP, as expected for hydrophobic surfaces. The isoelectric point of the most highly graphitic surface was found to be pH(iso) = 3.7. Surface oxidation of these films resulted in a decrease of SZP at all pH values and in a downshift of pH(iso) to values lower than 1.5, consistently with the presence of surface acidic groups arising from oxidation. Results indicate that the specific choice of acid/base chemistry for the tracer particles does not significantly affect either SZP or pH(iso) determinations. These results show that the tracer particle method in combination with widely available latex beads as tracers can be applied for the determination of carbon SZP as a function of pH.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10403 - Physical chemistry

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Surface and Interface Analysis

ISSN

0142-2421

e-ISSN

—

Volume of the periodical

49

Issue of the periodical within the volume

8

Country of publishing house

GB - UNITED KINGDOM

Number of pages

7

Pages from-to

781-787

UT code for WoS article

000407287100015

EID of the result in the Scopus database

2-s2.0-85014967882