SPECTRAL DATA OF SURFACE VISCOELASTIC MODULUS ACQUIRED VIA DIGITAL FOURIER TRANSFORMATION

被引:68
作者
LOGLIO, G
TESEI, U
CINI, R
机构
[1] Institute of Physical Chemistry, University of Florence, 50121 Florence
关键词
D O I
10.1016/0021-9797(79)90242-X
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The time domain behavior of dynamic surface tension was experimentally observed for submicellar aqueous solutions (2 × 10-3 and 4 × 10-3 mole m-3) of the surfactant dimethyldodecylphosphine oxide. The frequency domain behavior was calculated. by mapping one domain into the other with the Fourier transform operator. Two consecutive numerical processing runs were performed with different discretizations of the same input signal (0.1- and 3.0-sec time intervals between readings, respectively). By choosing an appropriate part of the output array from each run, satisfactorily accurate spectra of surface viscoelastic modulus were obtained. Values of parameters, determined from the reported spectra on the basis of the Lucassen theory, compare favorably with those given in the literature (obtained from equilibrium data). © 1979.
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页码:316 / 320
页数:5
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