Article Per Year (5 Year)
p-Index From 2021 - 2026
0.408
P-Index
This Author published in this journals
All Journal Journal of Technomaterial Physics
Asti Sawitri
Department of Physics, Universitas Halim Sanusi, Bandung, 40116, Indonesia
Astronomy Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics

Published : 2 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 2 Documents
Search

 1 
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.
Optical, Electrochemical, and Photovoltaic Evaluation of Suji Leaf (Dracaena angustifolia) Extract as a Natural Sensitizer for Dye-Sensitized Solar Cells Asti Sawitri; Hasniah Aliah; Siti Nur Jaoharoh Muthmainnah; Ryan Nur Iman
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.v8i2.26017

Abstract

A dye-sensitized solar cell (DSSC) is a third-generation solar cell technology that uses a dye as a sensitizer to convert light energy into electrical energy. This study aims to evaluate the potential of suji leaf extract (Dracaena angustifolia) as a natural dye for TiO₂-based DSSC using acetone and ethanol as solvents. Characterization was performed using UV-Vis, cyclic voltammetry (CV), and current–voltage (I–V) measurements. The UV-Vis results showed a maximum absorption peak at around 655 nm, indicating the dominance of chlorophyll pigments. The acetone extract produced higher absorbance and chlorophyll-a content than the ethanol extract. The CV results showed that the HOMO and LUMO energy levels of the acetone extract were −4.86 eV and −4.29 eV, respectively, whereas those of the ethanol extract were −4.90 eV and −4.44 eV. DSSC testing revealed that the acetone extract yielded a higher Voc value (0.0194 V) compared to the ethanol extract (0.0175 V), while both exhibited a Jsc value of 0.0667 mA·cm-2. The ethanol extract achieved a higher FF (57.9%) than the acetone extract (53.2%). The power conversion efficiencies obtained were 0.050% for the acetone solvent and 0.049% for the ethanol solvent. The results indicate that suji leaf has potential as a natural sensitizer in DSSC, with performance influenced by the choice of extraction solvent.
Co-Authors Hasniah Aliah Marathur Rodhiyah Ryan Nur Iman Siti Nur Jaoharoh Muthmainnah Yuan Alfinsyah Sihombing