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Inverse gas chromatography and XPS of extracted kraft pulps
Gamelas, José A.F.; Duarte, Gustavo V.; Ferreira, Paulo J.Kraft pulps at the kappa number level of 15 obtained from Acer saccharum (sugar maple) and Eucalyptus globulus prepared with and without hot water pre-extraction (HWE) were analysed by inverse gas chromatography (IGC) and X-ray photoelectron spectroscopy (XPS). In the case of A. saccharum pulps, the dispersive component of the surface energy (γsd) at 40ºC determined by IGC was 39.8 mJ m-2 (control pulp without ...
Polyoxometalate/laccase-mediated oxidative polymerization of catechol for texti...
Kim, Suyeon; Silva, Carla Manuela; Evtuguin, D. V.; Gamelas, José A. F.; Paulo, Artur CavacoThe synergistic effect between polyoxometalates (POMs), namely K5[SiW11VVO40]·11H2O and H5[PMo10 VV2O40]·13H2O and laccase from ascomycete Myceliophthora thermophila has been employed for the first time in oxidative polymerization of catechol. Such a laccase-mediator system allowed the formation of a relatively high molecular weight polycatechol as confirmed by size exclusion chromatography and electrospray ion...
A New Approach for the Modification of Paper Surface Properties Using Polyoxome...
Saraiva, Mikhail S.; Gamelas, José A. F.; Sousa, António P. Mendes de; Reis, Bruno M.; Amaral, José L.; Ferreira, Paulo J.A new approach for the chemical modification of the surface of paper based on the application of colloidal mixtures containing cationic starch and polyoxometalates on uncoated base paper is presented. Polyoxometalates with the Keggin-type structure and physical properties similar to those presented by coating pigments, namely H3PW12O40·23H2O, H4SiW12O40·24H2O, and K7PW11O39·9H2O, have been used in order to impr...
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