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The influence of the deposition time on morphological and optical properties of Cu x S films deposited on polypropylene substrate

Pop A. E., Popescu V., Dinescu A., Batin M. N.

Materials Science Poland

2013

Vol. 31, No. 3

318--324

Copper sulfide (CuxS) films deposited on polypropylene substrate were obtained by chemical bath deposition (CBD) method. The influence of the deposition time on the morphology of CuxS films was studied by means of scanning electron microscopy. We have found that the average particles dimension increased from 37 to 49 nm with the increase of deposition time from 20 to 30 minutes. The study of optical properties of the copper sulfide films was carried out based on optical transmission spectra recorded in the 400 – 1000 nm wavelength range. The optical constants, such as refractive index, extinction coefficient and dielectric constant as well as electrical and optical conductivity of CuxS films were calculated. The obtained values are in accordance with the ones reported in the literature: We have shown that both, morphological and optical properties of CuxS films are strongly affected by the deposition time.

Urea treatment of acrylic fibers in case of dyeing with anionic dyes

Popescu V.

Zeszyty Naukowe. Włókiennictwo / Politechnika Łódzka

2000

z. 59

117-126

Anionic dyes can be used in dyeing of acrylic fibers with cationic nature (Creslan, Acrilan) or in case of acrylic fibers subjected to introduction of such basic groups into the polymer macromolecules by chemical treatments. In this paper are presented the possibilities of acrylic fibers dyeing with anionic dyes by pre-treatment, which lead to chemical structure modification. The samples treated with urea in addition with sodium hydroxide, hydrogen peroxide, ethylene carbonate (EC) and ethylene alcohol (EA) were further dyed with anionic dyes. A comparison was made between the colour intensity of acrylic samples pre-treated and dyed and that of acrylic fibers dyed without any chemical treatment. Experiments were made considering the influence of pre-treating time, urea concentration and additive concentration. Results obtained showed a good level of dyeing and high crocking and washing fastness.