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Yuan Alfinsyah Sihombing
Department of Physics, Faculty of Mathematics and Natural Science, Universitas Sumatera Utara, Medan, 20155, Indonesia
Astronomy Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics

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Reactive Diffusion Model in Determining Dissolution Rate of Edible Electronics Materials Yuan Alfinsyah Sihombing; Asti Sawitri; Marathur Rodhiyah
Journal of Technomaterial Physics Vol. 8 No. 1 (2026): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v8i1.24766

Abstract

Edible electronic materials have emerged as an attractive research with broad potential applications. In the healthcare field, these materials can be utilized for diagnosing, monitoring, and treating organs within the gastrointestinal tract. A key characteristic of these materials is their ability to be digested and dissolved in water or bodily fluids. This study aims to theoretically investigate and predict the dissolution behavior of edible electronic materials using a one-dimensional (1D) reactive diffusion model. This model indicates that the dissolution behavior is governed by two primary parameters: the reaction rate constant (k) and the water diffusivity (D). Materials such as magnesium (Mg), zinc (Zn), and molybdenum (Mo) exhibit average dissolution rates ranging from 2.51 × 10-12 cm s-1 to 3.40 × 10-8 cm s-1 for diffusivity values between 10-17 and 10-10 cm2 s-1. In addition, the ratio of effective thickness to initial thickness (h/h0) increases and is influenced by the molar mass of the material, following the order Mo > Zn > Mg. The dissolution rate modeling results demonstrate that the reactive diffusion model is capable of representing trends that are consistent with experimental observations.
A Diffusion-Controlled Model for Swelling Behavior in Polymeric Hydrogels Marathur Rodhiyah; Muhammad Risyad Naufal; Tyas Al Arandi; Yuan Alfinsyah Sihombing
Journal of Technomaterial Physics Vol. 8 No. 2 (2026): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v8i2.26077

Abstract

Hydrogels are cross-linked polymer networks capable of absorbing large amounts of water, supporting diverse biomedical, pharmaceutical, and agricultural applications. Their swelling behavior is governed by water diffusion within the polymer matrix and is commonly described by the classical Crank solution for Fickian diffusion in a plane sheet, expressed in terms of the normalized fractional water uptake (Mt/M∞). Therefore, an additional conversion is required to relate it to the swelling degree S(t).This study presents the one-dimensional Fickian diffusion solution for a hydrogel slab of thickness L, with surfaces held at a constant equilibrium concentration, and recasts it as a closed-form expression for the time-dependent swelling degree, S(t), directly in terms of the effective diffusion coefficient (D) and the equilibrium swelling degree (Seq). The resulting solution reproduces characteristic Fickian relationship at short times, and predicts the scaling law . Parametric analysis further shows that governs the swelling rate, whereas  determines the equilibrium swelling capacity. The predicted trends are qualitatively consistent with reported hydrogel swelling behavior. Whereas the classical Crank model focuses on relative water uptake, the proposed formulation translates diffusion kinetics into the swelling degree, S(t), enabling direct interpretation of measurable swelling behavior through a simple and physically meaningful analytical framework.
Co-Authors Asti Sawitri Marathur Rodhiyah Marathur Rodhiyah Muhammad Risyad Naufal Tyas Al Arandi