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All Journal Science and Technology Indonesia Jurnal Pendidikan Matematika (JUDIKA EDUCATION)
Rahmayanti, Dita
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Education Environmental Science Materials Science & Nanotechnology Mathematics Physics

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Study on Crystal Structure, Surface Area, and Energy Gap Behaviors of Nanotitania Polymorphs Prepared Using Monoethanolamine Manurung, Posman; Maharani, Renita; Rahmayanti, Dita; Yulianti, Yanti; Junaidi; Marjunus, Ronius
Science and Technology Indonesia Vol. 9 No. 2 (2024): April
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2024.9.2.345-353

Abstract

Polymorphous nanotitania samples were prepared from titanium butoxide (TTB) as a precursor using sol-gel processing in ethanol as a solvent, without and with monoethanolamine (MEA). The experiments used 5.25 mL TTB and MEA with varied volumes of 0.5, 1.0, 1.5, and 2.0 mL. The sample without MEA was specified as sample A, and the samples produced using MEA were specified as samples B, C, D, and E, respectively. All samples were calcined at 500 °C for 4 h and then collected data by X-ray Diffraction (XRD), the Brunauer-Emmett-Teller (BET) method used to analyze Surface Area Analyzer (SAA), Transmission Electron Microscopy (TEM), Raman Spectroscopy, and UV-Visible Diffuse Reflectance Spectroscopy (UV-Vis DRS). The results of XRD characterization indicate that samples A and B form anatase phase, while samples C and D are composed of anatase, brookite, and rutile phases, and sample E is consisted of anatase and brookite phases with weight percentages of (94.53 ± 1.72) % and (5.47 ± 0.36) %, respectively. The presence of the three phases of titania is also confirmed by Raman spectroscopy analysis, which showed anatase peaks at 146, 197, 398, and 513 cm-1, brookite peaks at 245 and 402 cm-1, and rutile peaks at 319, 436, and 612 cm-1. According to XRD, the samples have the particle size in the range of 14-19 nm. A representative sample (sample C) was also characterized using TEM, revealing a particle size of 16.0 ± 0.3 nm. This representative sample revealed the largest surface area of 172.2 m2/g, as seen by BET, and the lowest energy gap of 3.03 eV.
Penerapan Model Kooperatif Tipe Team Assisted Individualization (TAI) pada Pembelajaran Matematika Rahmayanti, Dita; Friansah, Drajat; Yuneti, Armi
Jurnal Pendidikan Matematika : Judika Education Vol 6 No 2 (2023): Jurnal Pendidikan Matematika : Judika Education
Publisher : Institut Penelitian Matematika, Komputer, Keperawatan, Pendidikan dan Ekonomi (IPM2KPE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31539/judika.v6i2.7109

Abstract

The aim of this research is to determine the completeness of the mathematics learning outcomes of fifth grade students at SD Negeri 17 Lubuklinggau after implementing the Team Assisted Individualization (TAI) type cooperative model. This type of research is quasi-experimental research carried out without a comparison class with a pre-test and post-test group design. The population is class V of SD Negeri 17 Lubuklinggau for the 2022-2023 academic year, which consists of 17 students. Data collection was taken using test techniques. The collected data was analyzed using the t-test. Based on the results of the t-test analysis at the significance level α = 0.05, it is obtained (2.600) > (1.75). In conclusion, the mathematics learning outcomes of fifth grade students at SD Negeri 17 Lubuklinggau after implementing the Team Assisted Individualization (TAI) type cooperative model were significantly complete. Keywords: Cooperative Model, Team Assisted Individualization (TAI), Mathematics Learning
Co-Authors Drajat Friansah, Drajat Junaidi Junaidi Maharani, Renita Marjunus, Ronius Posman Manurung Yanti Yulianti Yuneti, Armi