Naslov
Termodinamika i kinetika razlijevanja organskih tekućina na nabijenoj, vodljivoj međupovršini: Kritična površinska napetost kvašenja
(Thermodynamics and kinetics of spreading of organic liquids at a charged conductive interface: Critical interfacial tension of wetting)

Autori
Ivošević, Nadica ; Tomaić, Jadranka ; Žutić, Vera

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Book of abstracts / - , 1995, 165-165

Skup
XIV Skup Hrvatskih kemičara i IV Hrvatski simpozij o kemiji i tehnologiji makromolekula

Mjesto i datum
Zagreb, Hrvatska, 06.02.1995. - 08.02.1995

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
critical interfacial tension, mercury interface, organic liquids, spreading

Sažetak
Critical wetting potentials of a dropping mercury electrode immersed in aqueous dispersion of organic liquids' represent well- defined and characteristic value, that might offer predictions of interpolative nature for interactions of organic particles in the aquatic environment and a framework for investigation of fast wetting transients. The polarographic method is based on measurement of charging current caused displacement of surface charge due to attachment and spreading of organic droplets (micromcter size range) at the aqueous-mercury interface. Dispersion of n-alkanes (C7-C16) in 0.1 M NaF aqueous solution was used as a model system. Excellent agreement was obtained between critical interfacial tensions of wetting electrochemical from critical potentials and prediction based on the Good-Girifalco-Fowkes equation for mercury-water n-alkane system. Identical values of critical interfacial tension were obtained at positively and negatively charged mercury interface. Experiment with dispersion of squalene in 0.1 M solutiun of fluoride, bromide, iodide showed that critical interfacial tension of wetting depends on specific adsorption of anions. Specifically adsorbed anions render the displacement interaction more difficult. Critical interfacial tension of wetting at positively charged mercury interface increases in sequence F<Br<I. References: 1. N. Ivošević, J. Tomaić, V. Žutić, Langmuir 1994, 10, 2415-2418. 2. F. M. Fowkes, J. Phys. Chem. 1963, 66, 2539.

Izvorni jezik
Engleski

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