Nada Glumac (Author), Milan Momčilović (Author), Iztok Kramberger (Author), Darko Štraus (Author), Nikola Sakač (Author), Elvira Kovač-Andrić (Author), Bojan Đurin (Author), Marija Kraševac Sakač (Author), Kristina Đambić (Author), Marija Jozanović (Author)

Abstract

Two new surfactant sensors were developed by synthesizing Pt-doped acid-activated multiwalled carbon nanotubes (Pt@MWCNTs). Two different ionophores using Pt@MWCNTs, a new plasticizer, and (a) cationic surfactant 1,3-dihexadecyl-1H-benzo[d]imidazol-3-ium-DHBI (Pt@MWCNT-DHBI ionophore) and (b) anionic surfactant dodecylbenzenesulfonate-DBS (Pt@MWCNT-DBS ionophore) composites were successfully synthesized and characterized. Both surfactant sensors showed a response to anionic surfactants (dodecylsulfate (SDS) and DBS) and cationic surfactants (cetylpyridinium chloride (CPC) and hexadecyltrimethylammonium bromide (CTAB)). The Pt@MWCNT-DBS sensor showed lower sensitivity than expected with the sub-Nernstian response of ≈23 mV/decade of activity for CPC and CTAB and ≈33 mV/decade of activity for SDS and DBS. The Pt@MWCNTDHBI surfactant sensor had superior response properties, including a Nernstian response to SDS (59.1 mV/decade) and a near-Nernstian response to DBS (57.5 mV/decade), with linear response regions for both anionic surfactants down to ≈2 × 10−6 M. The Pt@MWCNT-DHBI was also useful in critical micellar concentration (CMC) detection. Common anions showed very low interferences with the sensor. The sensor was successfully employed for the potentiometric titration of a technical grade cationic surfactant with good recoveries. The content of cationic surfactants was measured in six samples of complex commercial detergents. The Pt@MWCNT-DHBI surfactant sensor showed good agreement with the ISE surfactant sensor and classical two-phase titration and could be used as an analytical tool in quality control

Keywords

senzorji;surfaktanti;karbonski nanodelci;potentiometric surfactant sensor;metal-doped MWCNT;surfactants;carbon nanocomposite;sensors;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UM FERI - Faculty of Electrical Engineering and Computer Science
UDC: 681.586
COBISS: 192015107 Link will open in a new window
ISSN: 1424-8220
Views: 14
Downloads: 0
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Other data

Secondary language: Slovenian
Secondary keywords: senzorji;surfaktanti;karbonski nanodelci;
Type (COBISS): Article
Pages: 14 str.
Volume: ǂVol. ǂ24
Issue: ǂiss. ǂ8, [article no.] 2388
Chronology: 8 April 2024
DOI: 10.3390/s24082388
ID: 24798340