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All Journal Indonesian Journal of Chemistry
Foliatini Foliatini
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Indonesia, Depok 16424
Chemical Engineering, Chemistry & Bioengineering Chemistry

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Theoretical Analysis of Interaction Energy in Alginate-Capped Gold Nanoparticles Colloidal System Foliatini Foliatini; Yoki Yulizar; Mas Ayu Elita Hafizah
Indonesian Journal of Chemistry Vol 14, No 3 (2014)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (285.143 KB) | DOI: 10.22146/ijc.21234

Abstract

Stability of Au/alginate nanocomposite was theoretically evaluated by computing various interactions energy which contributes in the system, including attraction and repulsion interaction. The results revealed that both polymer and electrostatic charges played a significant role in the stabilization, but the steric repulsion comes from polymer chain is a more effective stabilization mechanism than the electrostatic repulsion. Higher pH yielded in stronger electrostatic repulsion but when the alginate thickness is low the resulting nanocomposite was less stable in a long time period. Interaction energies for Au/alginate nanocomposite colloidal system was up to ~60 kT for alginate thickness of 1 nm, at very short particle-particle separation distance (< 1 nm). As the alginate thickness can be controlled by adjusting the alginate concentration, it can be concluded that the high stability of Au/alginate nanocomposite can be achieved by employing an appropriate amount of alginate concentration.
Co-Authors Mas Ayu Elita Hafizah Yoki Yulizar