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All Journal Jurnal Pendidikan Fisika Undiksha Jurnal Ilmu Sosial dan Humaniora Jurnal Penelitian Pendidikan IPA (JPPIPA) ORBITA: Jurnal Pendidikan dan Ilmu Fisika Martabe : Jurnal Pengabdian Kepada Masyarakat WIDYA LAKSANA Indonesian Physical Review JURNAL PENDIDIKAN MIPA Jurnal Filsafat Indonesia Journal of Comprehensive Science PENDASI: Jurnal Pendidikan Dasar Indonesia
Ida Bagus Putu Mardana
Universitas Pendidikan Ganesha
Agriculture, Biological Sciences & Forestry Arts Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Languange, Linguistic, Communication & Media Library & Information Science Materials Science & Nanotechnology Mathematics Physics Social Sciences Other

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SYNTHESIS OF MAGNETITE NANOPARTICLES (Fe3O4) BASED ON TAMAN RIVER SAND MAGNETIC MINERALS Agung, Gusti Kade Agung Widiantara; Mardana, Ida Bagus Putu; Arjana, I Gede
Indonesian Physical Review Vol. 7 No. 3 (2024)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v7i3.314

Abstract

This research aims to produce Fe3O4 magnetic nanoparticles-based Taman River sand as the raw material through coprecipitation. The Fe content percentage in the Taman River sand after separation was characterized using XRF testing. The lattice parameters and crystal size of the samples were tested using XRD. The nanoparticles' morphology, structure, particle shape, and elemental content were characterized using SEM-EDX. The magnetic properties and magnetic saturation values were tested using VSM. XRF testing results on the iron sand showed a Fe content of 84.72%. The synthesis resulted in a brNownish-black Fe3O4 nanoparticle powder that a permanent magnet could attract. Based on the XRD results, the Fe3O4 nanoparticle powder peaks were obtained at X-ray diffraction pattern angles of 2θ: 21.44°, 35.38°, 41.74°, 50.78°, 63.36°, 67.70°, and 74.66°, indicating the presence of Fe3O4 nanoparticles. The crystal structure formed was cubic with lattice parameters a = b = c = 8.331 Å and a crystal size of 18.43 nm. SEM-EDX results showed an average particle size of 25-30 nm. VSM results indicated that the Fe3O4 sample had a saturation magnetization (Ms) of 27.36 emu/g, a remanent magnetization (Mr) of -0.01 emu/g, and a coercive field (Hc) of 0.01 T.
Sulfidation of Iron - Based Nanomaterial as Catalyst for Water Splitting Using Hydrothermal Lestari, Ni Luh Ayu Ardi; Arjana, I Gede; Mardana, Ida Bagus Putu
Journal of Comprehensive Science Vol. 3 No. 5 (2024): Journal of Comprehensive Science (JCS)
Publisher : Green Publisher Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59188/jcs.v3i5.728

Abstract

Consumption of fossil fuels causes greenhouse effect and global warming, hence the need for renewable energy sources that are environmentally friendly. Hydrogen is one of the abundant elements on earth. Hydrogen refers to a clean and renewable energy source, hydrogen can be a good choice to reduce greenhouse gas emissions. One way to produce hydrogen is by electrochemical water splitting. This study aims to determine the characterization of iron-based nanomaterials (iron sulfide - iron hydroxide) as a water splitting catalyst in general. Iron sulfide synthesis was carried out using hydrothermal sulfidation method for 6 hours at 80 oC with nickel foam as substrate. Synthesis of iron sulfide varying the concentration of sodium sulfide nonahydrate (0.0125 M, 0.025 M, 0.05 M and 0.1 M) produced brownish yellow to blackish grey colored samples. Characterization results using XRD showed that iron sulfide peaks were detected at higher concentrations of sodium sulfide nonahydrate. Based on the results of analyzing iron hydroxide using SEM, it is known that the sample is in the form of nano walls and on iron sulfide, it is known that the sample is in the form of nanoscale particles. Based on electrochemical measurement results, iron hydroxide can be a good catalyst for hydrogen evolution reaction (HER) compared with commercial Pt/C. The overpotential of iron hydroxide is smaller than Pt/C, which is only 15 mV at a current density 10 mA/cm2 and iron sulfide can be a good catalyst for oxygen evolution reaction (OER) with electrocatalytic measurement results close to commercial RuO2. This is indicated by the small overpotential (260 mV at current densisty 10 mA/cm2 and small tafel slope (51 mV/dec).
Effectiveness of a STEM-Based High School Chemistry Textbook with Scaffolding Strategy to Improve Students' Critical Thinking Skills Liani, Kadek Delita; Suardana, I Nyoman; Mardana, Ida Bagus Putu
Jurnal Penelitian Pendidikan IPA Vol 10 No 11 (2024): November
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v10i11.7181

Abstract

This study aims to explain the effectiveness of STEM-based high school chemistry textbooks with scaffolding strategies to improve critical thinking skills. This type of research involved research and development by adapting the Borg and Gall development models. The research instrument used was a critical thinking essay test. The research subjects were students of class XI A SMA Negeri 3 Singaraja. The research design used was a pre-experimental with one-group pretest-posttest design. The data were analyzed using a normalized gain score and a one-sample proportion test. The results showed that the n-gain score obtained was 0.56. The one-sample proportion test results showed a significance value of 0.001. Thus, a STEM-based high school chemistry textbook with a scaffolding strategy is effective in improving students' critical thinking skills.
Co-Authors ., Gusti Ayu Putu Bakti Mahayuni ., Kadek Ayu Meilani Wulandari ., Luh Ari Dwi Jayanti ., Luh Putu Santiaji ., Ni Kadek Aridani Basunari ., Ni Kadek Rahayu ., Ni Luh Heny Agustyari ., Ni Pt Sricandra Dewi ., Ni Putu Yuvik Sulistya Dewi ., Putu Kirania Andhika Putri A. A. Istri Agung Rai Sudiatmika Ade Sintia Wulandari Agung Widiantara, Gusti Kade Agung, Gusti Kade Agung Widiantara Agus Adiarta,ST,MT . Amerta, Gede Arya Ari Winata, I Wayan Artanayasa, Wayan Artha, I Komang Restu Widi Astika, I W. M Chrisinta, Debora Dewi Oktofa Rachmawati Dr. I Made Sugiarta, M.Si. . Drs. I Made Wirta, M.Pd . Erlina, Nia Gusti Ayu Putu Bakti Mahayuni . I Gede Arjana I Gede Dana Santika . I Gede Dana Santika ., I Gede Dana Santika I Gede Satya Widura . I Komang Januariyasa . I Komang Januariyasa ., I Komang Januariyasa I Komang Nudina I Made Dwi Juliarta Putra . I Nengah Karang Giarta . I Nengah Karang Giarta ., I Nengah Karang Giarta I Nyoman Putu Suwindra I Nyoman Suardana I Putu Wina Yasa Pramadi I W. M Astika I Wayan Ari Winata I Wayan Sadia I Wayan Suastra Ida Bagus Putu Arnyana Kadek Ayu Meilani Wulandari . Kadek Hary Mahardika . Kadek Hary Mahardika ., Kadek Hary Mahardika Ketut Suma Komang Gede Yudi Arsana . Lestari, Ni Luh Ayu Ardi Liani, Kadek Delita Luh Ari Dwi Jayanti . Luh Putu Santiaji . M.Pd Drs. I Made Wirta . Melkisedik Bukifan Ni Kadek Aridani Basunari . Ni Kadek Rahayu . Ni Luh Heny Agustyari . Ni Pt Sricandra Dewi . Ni Putu Yuvik Sulistya Dewi . Ni Wayan Sukerti Nur Lutfiyah, Yoni Peter Gelu, Leonard Prof. Dr. I Wayan Santyasa,M.Si . Putu Artawan Putu Dian Pratiwi . Putu Kirania Andhika Putri . Putu Widiarini Putu Yasa Putu Yasa Putu Yasa Simarmata, Justin Eduardo Suyoga Wiguna, Anak Agung Gde yoni nur lutfiyah