Naslov
Surface potential of b-alanine at the electrolyte/air and artificial seawater/air interface

Autori
Dragčević, Đurđica ; Bišćan, Jasenka

Izvornik
Colloids and Surfaces A: Physicochem. Eng. Aspects (0927-7757) 223 (2003), A; 35-43

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
b-Alanine; Surface potential; Dipole moment: Salinity gradient; Seawater

Sažetak
Surface potential and surface tension measurements in the concentration gradient from 10-7 to 10-1 mol dm-3 of b-alanine in 10-4 mol dm-3 NaCl and in the artificial seawater of various salinities are done. Results show variations in the orientation of b-alanine molecules on the air/solution interface, depending on b-alanine concentration and salinity. For lower concentrations (below 2 &middot ; ; ; 10-3 mol dm-3) of b-alanine in NaCl solution and for lower salinities (below 8 ‰ ) the carboxylic group (-COOH) is directed upward and the amino group (-NH2) downward (toward the liquid bulk), while the opposite is found at higher salinities and higher concentrations of b-alanine. It is found, from the dependence of the effective dipole moment, mef on the concentration of b-alanine, that, in the concentration range below 10-3 mol dm-3, the dipole moment is simply related to 1/C. Above this concentration, the effective dipole moment is smaller and its value fluctuates.

Izvorni jezik
Engleski

Znanstvena područja
Tekstilna tehnologija

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