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Single-walled carbon nanotubes fractionation via electrophoresis

Scheibe B., Lukaszczuk P., Rümmeli M. H., Kalenczuk R. J., Borowiak-Palen E.

Polish Journal of Chemical Technology

2011

Vol. 13, nr 3

1-4

This work presents the influence of the sonication time on the efficiency of the metallic/semiconducting (M/S) fractionation of diazonium salt functionalized single-walled carbon nanotubes (SWCNTs) via free solution electrophoresis (FSE) method. The SWCNTs synthesized via laser ablation were purified from amorphous carbon and catalyst particles through high vacuum annealing and subsequent refluxing processes in aqua regia solutions, respectively. The purified material was divided into two batches. The SWCNTs samples were dispersed in 1% SDS solution in ultrasound bath for 2 and 12 hours. Both dispersed SWCNTs samples were functionalized with p-aminobenzoic acid diazonium salt and fractionated via free solution electrophoresis method. Afterwards, the fractionated samples were recovered, purified from surfactant/functionalities by annealing and investigated via UV-Vis-NIR optical absorption spectroscopy (OAS). The efficiency of the fractionation process was estimated through the comparison of the van Hove singularities (vHS) presented in the obtained fractions to the starting SWCNTs.

New arylhydrazonothiazolidin-5-one disperse dyes for dyeing polyester fibers

Metwally M.A., Khalifa M.E., Attia E.A., Amer F.A.

Polish Journal of Chemical Technology

2010

Vol. 12, nr 1

1-6

A series of new thiazolidin-5-one disperse dyes was synthesized from the reactions of 2-substituted 3-phenylthiazolidinones with various aryldiazonium chlorides. The synthesized dyes were characterized by UV-visible absorption, IR, NMR and MS spectroscopy. The dyes gave orange to reddish-violet shades with very good depth on polyester fibers. The dyed fabrics show moderate to good fastness to light and very good to excellent fastness to washing and perspiration. Also, the assessment of color coordinates was discussed.

Influence of beta-Cyclodextrin on Coupling Reactions of o-Nitrobenzenediazonium Salt with Pyrrole

Jamrógiewicz M., Biernat J.

Polish Journal of Chemistry

2006

Vol. 80, nr 5

753-757

The influence of beta-cyclodextrin on o-nitrobenzenediazonium salt coupling with pyrrole has been studied analyzing the yield and products distribution.