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Dwi Nanto, Dwi
Department Of Physics Education, Faculty Of Tarbiya And Teaching Science, UIN Syarif Hidayatullah Jakarta, Indonesia
Aerospace Engineering Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Other

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Significant Reduction in Lattice Thermal Conductivity of (PbTe)0.95 - (PbS)0.05 Thermoelectric Materials Through Liquid Silicon Quenching Ginting, Dianta; Nurlela, Ai; Nanto, Dwi; Mashadi; Sudiro, Toto; Kristiantoro, Tony; Rhye, Jong-Soo
Science and Technology Indonesia Vol. 10 No. 4 (2025): October
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.2025.10.4.1087-1095

Abstract

Thermoelectric materials are game-changers, that have the ability to transform waste heat into electrical energy, making them a potential renewable energy solution to reduce reliance on fossil fuels. The standard metric for evaluating thermoelectric materials is the dimensionless figure of merit, ZT, which is markedly influenced by lattice thermal conductivity (ĸl ). Higher thermal transport through the lattice lowers the ZT value, reducing the material’s efficiency. Therefore, finding ways to decrease ????l is critical for boosting thermoelectric performance. In our research, we explored an innovative approach by applying a quenching technique using liquid silicon to reduce thermal conductivity (ĸT ) due to lattice vibrations. We compared the lattice conductivity (ĸl ) of materials with and without this liquid silicon quenching process. The results were striking: at 300 K, quenching lowers the lattice thermal conductivity by about 40.1 %, and at 800 K, it is still reduced by roughly 24.7%compared with pristine PbTe. Even more impressive, when compared to non-quenched (PbTe)0.95 − (PbS)0.05 alloys, at 300 K, the silicon-quenched sample attains an additional ĸl reduction of roughly 16.1 %, while at 800 K the extra decrease is about 13.0%. These findings highlight that liquid silicon quenching is a highly effective method for lowering ĸl of PbTe thermoelectric materials. This approach paves the way for developing next-generation thermoelectric materials that are more efficient, particularly for eco-friendly waste heat recovery applications. Our work opens new possibilities for sustainable energy innovation.
Cu Film Characteristics Synthesized Using Electrodeposition Technique at Various Currents and Under a Rotating Neodymium Magnet Susetyo, Ferry Budhi; Basori; Mansor, Muhd Ridzuan; Ruliyanta; Yudanto, Sigit Dwi; Rosyidan, Cahaya; Situmorang, Evi Ulina Margareta; Edbert, Daniel; Mutiara, Etty; Yulianto, Tri; Agus Jamaludin; Nanto, Dwi
Science and Technology Indonesia Vol. 10 No. 4 (2025): October
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.2025.10.4.1156-1168

Abstract

In the present study, Cu films were made over Al alloy using the electrodeposition technique. Electrodeposition conducted at various currents (80, 100, and 120 mA), with and without influence by a rotating magnetic field (100 rpm of rotation). 0.5 M CuSO4 + 20 mL of H2SO4 was used for electrolyte solutions. The sample before and after electrodeposition was weighed using digital scale to calculate deposition rate and current efficiency. All formed Cu films were characterized using X-ray diffraction (XRD), attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), Scanning electron microscopy equipped with Energy dispersive spectroscopy (SEM-EDS), and Potentiostat apparatus. Furthermore, antibacterial activity using Staphylococcus aureus was also investigated. Increasing the current of electrodeposition leads to an increase in deposition rate and current efficiency for both conditions (with and without rotating magnetic field influence). Based on the XRD and ATR-FTIR investigation, Cu was successfully deposited onto Al surface. Currents used for the electrodeposition process between 80-100 mA would result in a faceted structure, while using 120 mA results near to spheroidal. Shifting to higher currents leads to decreases in grain sizes and presenting a rotating magnetic field also enhances the grain size. Current and rotating magnetic influences are not linearly influencing corrosion potential, corrosion rate and antibacterial activity. The sample made using higher current plus influencing with a rotating magnetic field has less corrosion rate and higher area of inhibition at around 0.808 mmpy and 4.01 cm2.
Efektivitas Model Problem-based Learning Berbasis Variasi Bahan Ajar terhadap Hasil Belajar Peserta Didik: Sebuah Meta Analisis Wahyujati, Wardani Indah; Nanto, Dwi; Alatas, Fathiah
Jurnal Pendidikan Matematika dan Sains Vol. 14 No. 1 (2026): February 2026
Publisher : Faculty of Mathematics and Natural Sciences, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jpms.v14i1.90986

Abstract

Berbagai penelitian yang mengkaji penggunaan model problem-based learning oleh peserta didik menunjukkan temuan yang bervariasi mengenai tingkat efektivitas tersebut. Studi meta-analisis ini bertujuan untuk mengukur tingkat efektivitas bahan ajar berbasis problem-based learning yang ditinjau secara keseluruhan, jenis bahan ajar, tingkat pendidikan, tingkat wilayah dan aspek hasil belajar. Metode penelitian meta-analisis ini mengikuti pedoman pada kerangka kerja PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-analysis), besar pengaruh diukur berdasarkan effect size. Ditemukan 20 artikel yang layak untuk dianalisis. Dengan berbantuan software JASP, hasil penelitian menunjukkan bahwa model problem-based learning paling optimal ketika diintegrasikan dalam bahan ajar berbasis alat peraga khususnya pada jenjang SMA di Pulau Jawa. Model problem-based learning dalam berbagai bentuk bahan ajar terbukti efektif dalam meningkatkan hasil belajar peserta didik yang mencakup aspek kognitif, psikomotor, dan afektif.
Rotating-Magnetic-Field-Assisted Electrodeposition of Copper for Ambulance Medical Equipment Syamsuir Syamsuir; Ferry Budhi Susetyo; Bambang Soegijono; Sigit Dwi Yudanto; Basori Basori; Maman Kartaman Ajiriyanto; Daniel Edbert; Evi Ulina Margaretha Situmorang; Dwi Nanto; Cahaya Rosyidan
Automotive Experiences Vol. 6 No. 2 (2023)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ae.9067

Abstract

This study examines the influence of the application of a rotating magnetic field in the electrodeposition of copper (Cu). During the electrodeposition, five constant magnets were rotated (500 and 800 rpm) towards the bottom of the sample. To investigate deposition rate, surface morphology, phase, structure, corrosion resistance, and hardness in deposited Cu using a weighing scale, a scanning electron microscope equipped with energy dispersive spectroscopy (SEM-EDS), X-ray diffraction (XRD), potentiodynamic polarization, and hardness tester respectively. Bacterial activity was also evaluated through this research. Morphological surface observations showed that the increase in the rotational speed of the magnets during the electrodeposition process led to a smooth surface. A perfect Cu phase covers Al alloy with no oxide. The potentiodynamic polarization demonstrated by the increase in the rotating led to a shift to the more positive value of the corrosion potential. Moreover, the corrosion current also decreases with the increase in the rotating speed of the magnets. Less crystallite size promoted forming a higher hardness and inhibition zone of the Cu films.
Co-Authors Agus Jamaludin Aini Nadhokhotani Herpi Amarulloh, Reza Ruhbani Anggrainy, Rani Az-zahra, Puput Lismanda Azhar, Anugrah Bambang Soegijono Basori Basori Basori Basori Basori Cahaya Rosyidan Daniel Edbert Daniel Edbert, Daniel Dedi Dedi Dianta Ginting Etty Mutiara Evi Septiyani Evi Ulina Margaretha Situmorang Fathiah Alatas Ferry Budhi Susetyo Ferry Budhi Susetyo Hapitanur, Dinda Heri Hardiyanti Jan Setiawan Kurniawan, Ova Lubi, Ahmad Maman Kartaman Ajiriyanto Maman Kartaman Ajiriyanto Mansor, Muhd Ridzuan Mashadi Nanang Sudrajat, Nanang Notonegoro, Hamdan Akbar Nurlaela, Ai Nurlela, Ai Permata Sari, Intan Putri, Ananda Alifia Rahman, Ikhwan Nur Ramlan Rhye, Jong-Soo Rohim, Fahmi Rosika Kriswarini Royhanun Athiyyah Ruliyanta Ruliyanta Saptari, Sitti Ahmiatri Seong-Cho Yu, Seong-Cho Sigit Dwi Yudanto Simbolon, Silviana Suhk-Kun Oh, Suhk-Kun Syamsuir Syamsuir Taryana, Yana Taufiq Al Farizi Tihera, Dinda Tony Kristiantoro, Tony Toto Sudiro Tri Yulianto Umi Pratiwi Wahyujati, Wardani Indah Wen-Zhe Nan, Wen-Zhe Yudanto, Sigit Dwi Yunasfi Yuniarti, Elvan