Exploration the Influence of Ag+ Ion Solution Concentration Variations Coated on Biofoam Based on Cassava Starch and Corn Fiber on Crystallinity, Density, and Porosity

Pariaman Ginting; Sutiarno Sutiarno; Galang Haedi  Wijaya; Pulung Karo  Karo; Ediman Ginting  Suka; Agus  Riyanto

doi:10.23960/jemit.v5i2.177

Authors

Pariaman Ginting Department of Physics, University of Lampung, Bandar Lampung, Indonesia, 35141
Sutiarno Sutiarno Department of Physics, University of Lampung, Bandar Lampung, Indonesia, 35141
Galang Haedi Wijaya Department of Physics, University of Lampung, Bandar Lampung, Indonesia, 35141
Pulung Karo Karo Department of Physics, University of Lampung, Bandar Lampung, Indonesia, 35141
Ediman Ginting Suka Department of Physics, University of Lampung, Bandar Lampung, Indonesia, 35141
Agus Riyanto Department of Physics, University of Lampung, Bandar Lampung, Indonesia, 35141

DOI:

https://doi.org/10.23960/jemit.v5i2.177

Keywords:

bio-foam, biopolymer, crystallinity, density, porosity

Abstract

The bio-foam in this study was made from biopolymers in the form of cassava starch, cellulose from corn stalks, and a binder polymer in the form of polyvinyl alcohol (PVA). The bio-foam was molded using the thermo pressing method at T = 150 °C and pressed for t = 3 minutes. Ag⁺ions were added as an initial review of the physics properties of the bio-foam to serve as a reference for future antibacterial bio-foam manufacturing. Ag⁺ions were produced using the electrolysis method from AgBr rods with an electric voltage of 15 volts. Then, the electrolyzed solution containing Ag⁺ions was varied in concentration (12 ppm, 17 ppm, 22 ppm, 27 ppm). The ions were then coated on the bio-foam using the dip coating method and dried at room temperature. Along with the increase in the concentration of the Ag⁺ ion solution coated on the bio-foam, there was an increase in the bio-foam crystallinity with test values of 34.4%, 40.8%, 41.2%, and 42.6%, respectively. Based on these data, the crystallinity value of the bio-foam does not change significantly. It also aligns with the density test values, which tend to be constant with an average test value of 0.322 g/cm³. Furthermore, the concentration of the solution containing Ag+ ions did not influence the bio-foam's porosity properties, where the four samples tended to remain with an average value of 5.9%.

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