Hermina Bukšek (Author), Thomas Luxbacher (Author), Irena Petrinić (Author)

Abstract

The so-called zeta potential can be determined through electrokinetic measurements and indicates the status regarding surface charges along the interface between solids and liquids. Surface charge gives us information about the condition, quality, and characteristics of a macroscopic surface in the polar medium. In our study the zeta potential was determined using a 'SurPASS' electrokinetic analyzer based on the streaming current and streaming potential measurements. The aim of the research was to compare the results of two differently designed measuring cells (ĆAdjustable Gap CellĆ and 'Clamping Cell') but operating on the same principle. In order to investigate this problem, the zeta potential was determined for the three polymeric materials: poly(ethylene terephthalate) foil, thin-film polyamide composite membranes for nanofiltration and reverse osmosis. The results obtained with 'Clamping Cell' versus 'Adjustable Gap Cell' showed differences in zeta potential, where the 'Adjustable Gap Cell' gave more reproducible results. One reason for this behaviour could be the different geometries of the streaming channels. A more likely reason is the design of the 'Clamping Cell', that requires a sample size larger than necessary for zeta potential determination.

Keywords

electrical double layer;zeta potential;electrokinetic analyser;streaming current potential;polymeric materials;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UM FKKT - Faculty of Chemistry and Chemical Engineering
Publisher: =Slovenian Chemical Society
UDC: 541
COBISS: 14417686 Link will open in a new window
ISSN: 1318-0207
Views: 1342
Downloads: 107
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Other data

Secondary language: Slovenian
Secondary abstract: S pomočjo elektrokinetičnih meritev lahko določimo t. i. potencial zeta, ki določa stanje površinskega naboja na mejni površini trdnega telesa in tekočine. Podatki o površinskem naboju nam dajejo informacijo o stanju, kvaliteti in lastnostih površine makroskopskega telesa v polarnem mediju. V naši raziskavi smo potencial zeta določali z elektrokinetičnim analizatorjem »SurPASS«, ki temelji na merjenju pretočnega toka in pretočnega potenciala. Namen raziskave je bil primerjati rezultate, dobljene z različno oblikovanima merilnima celicama (»Adjustable Gap Cell« in »Clamping Cell«), ki delujeta na istem principu. V ta namen smo potencial zeta določili trem polimernim materialom: poli(etilen-tereftalatna) folija, tankoslojna poliamidna kompozitna membrana za nanofiltracijo in reverzno osmozo. Rezultati, pridobljeni s »Clamping Cell« v primerjavi z »Adjustable Gap Cell«, kažejo na razlike v potencialu zeta, kjer merilna celica »Adjustable Gap Cell« daje ponovljivejše rezultate. Eden izmed možnih razlogov za takšno obnašanje bi lahko bil v različnih geometrijah pretočnih kanalov. Veliko verjetnejši razlog leži v geometriji merilne celice »Clamping Cell«, ki zahteva večjo površino vzorca kot je potrebna za določitev potenciala zeta.
Secondary keywords: električni dvojni sloj;potencial zeta;elektrokinetični analizator;pretočni potencial;polimerni materiali;
URN: URN:NBN:SI
Type (COBISS): Scientific work
Pages: str. 700-706
Volume: ǂVol. ǂ57
Issue: ǂšt. ǂ3
Chronology: 2010
Keywords (UDC): mathematics;natural sciences;naravoslovne vede;matematika;chemistry;crystallography;mineralogy;kemija;
ID: 1438784