Fizikalno-kemijska i analitička karakterizacija funkcionaliziranih nanomaterijala kao potencijalnih tenzidnih senzora

doctoral thesis

• Title (english): Physicochemical and analytical characterization of functionalized nanomaterials as potential surfactant sensors
• Author: Mateja Hajduković
• Mentor: Mirela Samardžić (mentor)
• Committee member: Sandra Babić (predsjednik povjerenstva)
• Committee member: Stjepan Milardović (član povjerenstva)
• Committee member: Milan Sak-Bosnar (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2017-09-01, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Chemistry; Analytic Chemistry
• Universal decimal classification (UDC): 54 - Chemistry. Crystallography. Mineralogy

Abstract

Razvijen je novi potenciometrijski senzor za kationske tenzide (CATS) sa čvrstim kontaktom i polimernom tekućom membranom. Kao senzorski materijal upotrijebljene su višestjenčane ugljikove nanocjevčice (engl. multi-walled carbon nanotubes, MWCNT) funkcionalizirane sa cetilpiridinijevim (CP) kationom i sulfatnom grupom. Novi senzor je izrađen ugradnjom MWCNT-OSO3-CP+ u PVC membranu plastificiranu s 2-nitrofenil-oktil eterom (o-NPOE). Membrana je na tijelo elektrode nanesena “drop-casting “ metodom. Kemijska modifikacija MWCNT sa CP kationom i uporaba elektrode sa čvrstim kontaktom, pokazala je pozitivne učinke na svojstva senzora: znatno se smanjilo ispiranje osjetljivog materijala iz membrane, produljen radni vijek senzora, reduciran šum, te stabilniji tijek signal. Odzivne karakteristike novorazvijenog senzora ispitane su u odnosu na CP, heksadeciltrimetilamonij (CTA) i benzetonij (Hyamine) kation u vodi i u 0.01 M Na2SO4. Senzor je pokazao odličnu selektivnost za CATS, pri čemu su najbolji odziv, najniža granica detekcije i najšire mjerno područje izmjereni za CP kation, što je bilo očekivano. Novi senzor posjeduje odličnu selektivnost za CP katione u usporedni s anorganskim i organskim kationima najčešće korištenim u komercijalnim proizvodima i uspješno je primijenjen kao detektor završne točke titracije pri određivanju kationskih tenzida u pH području od 3 do 10. Uz to senzor je uspješno primijenjen za diferencijalnu titraciju dvokomponentne smjese CATS kao i za potenciometrijsko određivanje CATS u komercijalnim proizvodima.

Abstract (english)

The new potentiometric sensor for cationic surfactants (CATS), with solid contact and polymer liquid membrane, was developed. As the sensor material were used multi-walled carbon nanotubes (MWCNT) functionalized with cetylpyridinium (CP) cation and sulfate group. The new sensor was made by embedding MWCNT-OSO3-CP+ in PVC membrane plasticized with 2-nitrophenyl octyl ether (o-NPOE). The membrane was applied on the electrode body by drop-casting method. The chemical modification of MWCNT with CP cation and using of the solid contact electrode had positive effects on the most important sensor properties, such as considerably reduced leaching of the sensing material from the membrane, prolonged life time of the sensor, negligible noise and signal drift. The response characteristics of the newly developed sensor were tested in relation to the CP, benzethonium (Hyamine) and hexadecyltrimethylammonium (CTA) cation in water and
0.01 M Na2SO4. The sensor showed excellent selectivity for CATS, with the best response, the lowest limit of detection and the widest range measured for CP cation, as expected.
The new sensor exhibited excellent selectivity for CP cation compared to the inorganic and organic cations commonly present in commercial formulations, and it was successfully used as an end-point detector in the potentiometric titration of cationic surfactants in a pH range from 3 to 10. A two-component mixture containing CP and Hyamine was successfully differentially titrated and CATS were successfully potentiometric determined in commercial products using the new sensor.

• Keywords: funkcionalizirane MWCNT; kationski tenzid; kationsko tenzidni senzor; komercijalni proizvodi; potenciometrijska titracija
• Keywords (english): functionalized MWCNT; cationic surfactant; cationic surfactant sensor; commercial products; potentiometric titration
• Language: croatian
• URN:NBN: urn:nbn:hr:149:581288
• Promotion: 2017
• Project: Number: IP-2013-11-9060; Title: Primjena nanomaterijala u izradi potenciometrijskih tenzidnih senzora za primjenu u industriji i zaštiti okoliša; Title: The use of nanomaterials in the construction of potentiometric surfactant sensors for industrial and environmental applications; Acronym: NANOSENS; Leader: Milan Sak-Bosnar; Jurisdiction: Croatia; Funder: HRZZ; Funding stream: IP
• Study programme: Title: Chemical Engineering and Applied Chemistry - Doctoral course; Study programme type: university; Study level: postgraduate; Academic / professional title: doktor/doktorica znanosti, područje prirodnih znanosti, polje kemija (doktor/doktorica znanosti, područje prirodnih znanosti, polje kemija)
• Type of resource: Text
• Extent: 135 str. ; 30 cm
• File origin: Born digital
• Access conditions: Open access
• Created on: 2023-12-08 10:50:54