Synthesis, characterization, and humidity-responsiveness of guar gum xanthate and its nanocomposite with copper sulfide covellite.

Autor: Le TA; Laboratory of Molecular Sciences and Engineering, Åbo Akademi University, Henrikinkatu 2, 20500 Turku, Finland., Zouheir M; Laboratory of Molecular Sciences and Engineering, Åbo Akademi University, Henrikinkatu 2, 20500 Turku, Finland; Laboratoire de Matériaux, Procédés, Catalyse et Environnement (LMPCE), Université Sidi Mohammed Ben Abdellah, Fès, Route d'Imouzzer, BP 2427 Fès, Morocco., Nikiforow K; Institute of Physical Chemistry, Polish Academy of Sciences, 44/52 Kasprzaka, 01-224 Warsaw, Poland., Khatib M; The Department of Chemical Engineering, Technion - Israel Institute of Technology, Haifa 3200003, Israel., Zohar O; The Department of Chemical Engineering, Technion - Israel Institute of Technology, Haifa 3200003, Israel., Haick H; The Department of Chemical Engineering, Technion - Israel Institute of Technology, Haifa 3200003, Israel., Huynh TP; Laboratory of Molecular Sciences and Engineering, Åbo Akademi University, Henrikinkatu 2, 20500 Turku, Finland. Electronic address: tan.huynh@abo.fi.
Jazyk: angličtina
Zdroj: International journal of biological macromolecules [Int J Biol Macromol] 2022 May 01; Vol. 206, pp. 105-114. Date of Electronic Publication: 2022 Feb 25.
DOI: 10.1016/j.ijbiomac.2022.02.132
Abstrakt: A novel conjugation of guar gum with xanthate groups via facile aqueous xanthation reaction has been reported. Density of grafted xanthate on guar gum product (GG-X) is as high as 4.4%, thus GG-X is conceivably characterized and confirmed by various spectrometric, electrochemical, thermogravimetric, and microscopic methods. Complexation of GG-X with numerous borderline and soft metal ions (e.g. Fe 2+ , Co 2+ , Ni 2+ , Cu 2+ , Pb 2+ , Pt 2+ and Cd 2+ ) yields hydrophilic gel-like materials and shows good agreement with hard and soft acid and base (HSAB) theory. This indicates tremendous potential of GG-X in metal ion extraction, removal and hydrogel cross-linking. GG-X is also employed to formulate an aqueous colloidal dispersion of copper sulfide covellite (GG-X/CuS) nanocomposites. GG-X therefore behaves as a surfactant, allowing formation of electronically conductive nanocomposites. XRD indicates apparent beneficial effects of GG-X in the synthesis of CuS with a crystallite size of 15.6 nm. This novel nanocomposite is a promising material for humidity sensing, showing reversible linear responses to relative humidity changes within 10 to 80% range. The interaction between GG-X and water might cause changes in electrical permittivity of GG-X/CuS nanocomposite and/or electrical hopping conductivity between CuS nanoparticles.
(Copyright © 2022 The Authors. Published by Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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