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3. POLYELECTROLYTE COMPLEX NANOPARTICLES OF SOLUBLE LIGNIN AND CHITOSAN AS INTERFACIAL MODIFIER

Author

Shulga, Galia, Shakels, Vadims, Vitolina, Sanita, Neiberte, Brigita, Verovkins, Anrijs, and This work was carried out due to the financial support of the performed research from the Base Financing provided by the Latvian Ministry of Education and Science.

Subjects
kraft lignin, chitosan, polyelectrolyte complex, interfacial modifier, oil-in-water emulsion
Abstract

A water-soluble non-stoichiometric polyelectrolyte complex (LCP) was obtained as a result of the interaction of oppositely charged kraft lignin and high molecular chitosan by mixing their dilute water solutions. The sizes of the LCP nanoparticles were characterized by a bimodal distribution at pH 6, and their values were essentially smaller than the sizes of the chitosan particles. It was found that the LCP nanoparticles were characterized by remarkably lower values of surface tension at the air-water and the water-organic liquid interface in comparison with the initial biopolymers. With decreasing pH and increasing concentration of the LCP nanoparticles in the water solution, their adsorption ability at the interfaces was enhanced. The interface tension at the water-heptane interface changed non-linearly with increasing the polyelectrolyte complex concentration that was associated with the “saturation” effect. The dependence of the ability of the LPC nanoparticles to stabilize oil-in-water emulsion on pH values of the water phase was found.

Published
2023

8. Environmental performance of combined treated wood.

Author

Kuka, Edgars, Cirule, Dace, Andersone, Ingeborga, Andersons, Bruno, Kurnosova, Nina, Verovkins, Anrijs, and Puke, Maris

Subjects
WOOD, SERVICE life, COPPER, WOOD products, WOOD preservatives
Abstract

Modification can significantly improve the service life of wood products, however, from the environmental perspective, the process has its drawbacks causing excessive influence in some specific impact categories. To reduce the impact that is characteristic of each individual modification process and to gain benefits due to synergy, the potential of using a combined treatment (copper azole impregnation + thermal modification) is evaluated. The results show that a combined treatment can provide enhanced environmental performance over each individual modification. [ABSTRACT FROM AUTHOR]

Published
2023
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