Naslov
Electrokinetic Phenomena of Cotton Fabrics

Autori
Grancarić, Anamarija ; Pušić, Tanja ; Tarbuk, Anita ; Ribitsch, Volker

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Book of Papers of the 18th Congress of Chemists and Technologists of Macedonia / - Skopje : University of Technology, 2004, TXE-08

Skup
18th Congress of Chemists and Technologists of Macedonia

Mjesto i datum
Ohrid, Sjeverna Makedonija, 23.09.2004. - 25.09.2004

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Cotton fabrics; electrokinetic potential; surface charge

Sažetak
Textile fibres immersed in water (pH 6, 5-7) show the negative values of the ζ -potential because functional surface fibre groups dissociate in water imparting negative charge to the neutral fibre. By increasing pH the ζ -potential becomes more negative, and by decreasing more positive. It is important to consider that the ζ -potential depends on polymer nature, foreign matter content, and addition of finishing agents and on the manufacturing process. Values of the ζ -potential range broadly from -20 mV to -60 mV depending on chemical fiber composition, surface polarity, microstructure, porosity, specific surface, fibre swelling in the solution, interaction energy of fibre and solution, pH of the solution, electrolyte addition etc. Material used were three Standard cotton fabrics, one was 3/1 twill and two of those were 1/1 plain weave cotton fabrics, desized, scoured and bleached, free from finish residual chemicals and chemically damaged fibres. To determine zeta potential and the amount of surface fabric charge the samples were specially prepared and finally rinsed to the conductivity of deionised water (2-4 μ S/cm). Zeta potential and Point of Zero charge (PZC) of cotton samples was measured using the streaming potential/streaming current method where the solid phase is stationary (fibre, material), and the liquid one is mobile (water, electrolyte, e.g. KCl). An electrolyte solution is forced through a capillary system. Streaming potential Up and streaming current Ip arise due to the motion of ions and quantitatively determine zeta potential according to the Helmholtz-Smoluchowsky equation. Point of zero charge (PZC) is the amount of N-cethyl piridinium chloride added to electrolyte solution for change the negative charge of the fabric into the positive one. The PZC is determined at a pH 10 because maximal and constant ζ -potential of most materials at this pH value. It differs for individual cotton fabrics for the reason of fabric construction parameters that play an important role in the interface phenomena.

Izvorni jezik
Engleski

Znanstvena područja
Tekstilna tehnologija

POVEZANOST RADA