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All Journal Komunikasi Fisika Indonesia Phi : Jurnal Pendidikan Fisika dan Terapan Jurnal Fisika Unand JOURNAL ONLINE OF PHYSICS Jurnal Sains & Teknologi Lingkungan Jurnal Fisika FLUX Jurnal Ilmiah Universitas Batanghari Jambi Jurnal Rekayasa Material, Manufaktur & Energi JISTech (Journal of Islamic Science and Technology) Fisitek : Jurnal Ilmu Fisika dan Teknologi JOURNAL OF SCIENCE AND SOCIAL RESEARCH Saintifik : Jurnal Matematika, Sains, dan Pembelajarannya Jurnal Teori dan Aplikasi Fisika Jurnal Pengabdian kepada Masyarakat Nusantara Navigation Physics : Journal of Physics Education JTTM: Jurnal Terapan Teknik Mesin CHEDS: Journal of Chemistry, Education, and Science Phydagogic : Jurnal Fisika dan Pembelajarannya JIFP (Jurnal Ilmu Fisika dan Pembelajarannya) Panthera : Jurnal Ilmiah Pendidikan Sains dan Terapan EINSTEIN (E-JOURNAL) Jurnal Ilmu dan Inovasi Fisika Jurnal Penelitian Teknologi Informasi dan Sains
Ridwan Yusuf Lubis
Universitas Islam Negeri Sumatera Utara
Aerospace Engineering Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Immunology & microbiology Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Social Sciences Other

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ANALISIS KEMAMPUAN PENYERAPAN GELOMBANG MIKRO PADA BARIUM HEKSAFERIT (BaFe₁₂O₁₉) DENGAN VARIASI DOPING LANTANUM MELALUI UJI VECTOR NETWORK ANALYZER (VNA) Natasya, Kinanty Desiva; Nasution, Nazaruddin; Lubis, Ridwan Yusuf
JOURNAL OF SCIENCE AND SOCIAL RESEARCH Vol 8, No 4 (2025): November 2025
Publisher : Smart Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54314/jssr.v8i4.4367

Abstract

Perkembangan teknologi komunikasi meningkatkan Electromagnetic Interference (EMI), sehingga diperlukan material penyerap gelombang mikro yaitu Radar Absorbing Material (RAM). Barium heksaferit (BaFe₁₂O₁₉) berpotensi sebagai RAM karena sifat magnetik dan stabilitas kimianya. Penelitian ini bertujuan menganalisis kemampuan penyerapan gelombang dengan doping Lantanum (La) melalui metode solid state reaction pada variasi x = 0,00; 0,01; 0,03; dan 0,05. Proses sintesis dilakukan dengan kalsinasi pada suhu 600 °C dan sintering pada suhu 1200 °C, kemudian dikarakterisasi menggunakan Vector Network Analyzer (VNA). Hasil pengujian menunjukkan bahwa doping 0,05 memberikan Reflection Loss (RL) terbaik sebesar −10,45 dB pada frekuensi 8,95 GHz dengan persentase penyerapan 90,98%, sehingga memenuhi kriteria penyerap efektif. Dengan demikian, doping La³⁺ terbukti meningkatkan kinerja BaFe₁₂O₁₉ sebagai material penyerap gelombang untuk mitigasi EMI dan aplikasi radar.
Sintesis dan Karakterisasi Nanokomposit Fe3O4/PANI sebagai Komponen Anoda Baterai Harahap, Balkis Br; Lubis, Ridwan Yusuf; Daulay, Abdul Halim
Panthera : Jurnal Ilmiah Pendidikan Sains dan Terapan Vol. 6 No. 1 (2026): January
Publisher : Lembaga Pendidikan, Penelitian, dan Pengabdian Kamandanu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36312/panthera.v6i1.988

Abstract

Magnetic materials such as Fe₃O₄ have high potential as conductive materials and energy stores. However, its limited electrical properties require modification through the addition of conductive polymers to improve its performance. The combination of Fe₃O₄ and Polyanillin (PANI) is expected to improve conductivity and capacitance through the formation of Fe₃O₄/PANI nanocomposites. In this study, Fe₃O₄/PANI nanocomposites were synthesized using a co-precipitation method with local iron sand-based materials, then combined through an in situ polymerization method using aniline monomer volume variations of 4 mL, 6 mL, 8 mL, and 10 mL, coded PA1, PA2, PA3, and PA4, respectively. The results of characterization using X-Ray Diffraction (XRD) showed the formation of two main phases, namely magnetite (Fe₃O₄) and maghemite (γ-Fe₂O₃). Scanning Electron Microscopy (SEM) analysis showed that increased volume of aniline monomer resulted in a more homogeneous composite surface, although excessive volume led to overpolymerization. The test results using the LCR Meter showed an increase in capacitance and electrical conductivity values to reach optimal conditions in the PA3 sample, with a crystal size of 50.94 nm, capacitance of 8.9 F, resistance of 1.0 Ω, and conductivity of 127.4 S/m. These results prove that the variation in aniline monomer volume has a significant effect on the structural and electrical properties of Fe₃O₄/PANI nanocomposites. The optimum composition of PA3 shows high potential as an anode material or conductive energy storage electrode that supports the development of environmentally friendly and sustainable energy technology.
PENGARUH VARIASI MASSA PADA GREEN SYNTHESIZED MATERIAL ADSORPSI Fe3O4/TiO2 DENGAN METODE KOPRESIPITASI TERHADAP NILAI BANDGAP MENGGUNAKAN UV-VIS Arnydhinata, Ella; Lubis, Ridwan Yusuf; Husnah, Miftahul
CHEDS: Journal of Chemistry, Education, and Science Vol 9, No 2 (2025)
Publisher : Universitas Islam Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30743/cheds.v9i2.11961

Abstract

Material fotokatalitik adalah material yang digunakan untuk mempercepat degradasi polutan dalam air dengan menyerap foton yang dapat mempercepat reaksi kimia. Proses fotokatalitik dapat dipercepat jika nilai bandgap material lebih kecil dengan mencampurkan Fe₃O₄ dan TiO₂. Proses pencampuran menggunakan metode kopresipitasi. Rasio massa yang digunakan untuk Fe₃O₄/TiO₂ (FT) adalah 2:1 (FT1), 1:1 (FT2), dan 1:2 (FT3). Sampel FT kemudian diuji menggunakan XRD dan UV-Vis untuk menilai hasil degradasi dan pengurangan bandgap. Hasil analisis XRD menunjukkan penurunan ukuran kristal dari 30,71 menjadi 28,59 nm. Pengujian UV-Vis menunjukkan penurunan nilai bandgap sebesar 2,38 eV dan persentase degradasi sebesar 99,55%. Peningkatan rasio massa TiO₂ terhadap Fe₃O₄ memengaruhi ukuran dan nilai bandgap material fotokatalitik. Hasil degradasi metilen biru yang paling optimal diperoleh pada sampel FT3 dengan rasio campuran 1:2.
Karbon Aktif Kulit Bawang Merah (Allium ascalonicum) untuk Mereduksi Bilangan Asam dan Peroksida: Indonesia Lubis, Ridwan Yusuf; Insani, Rizki; Husnah, Miftahul; Silalahi, Ali Affan
Jurnal Sains & Teknologi Lingkungan Vol. 18 No. 1 (2026): SAINS & TEKNOLOGI LINGKUNGAN
Publisher : Teknik Lingkungan Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/jstl.vol18.iss1.art3

Abstract

Activated carbon is one of the adsorption materials commonly used to improve the quality of used cooking oil. This study aims to determine the effect of varying concentrations of phosphoric acid (H₃PO₄) as a chemical activator on activated carbon derived from red onion peel. The research data were expressed quantitatively through physical and chemical characterization, while the results of color and odor tests were presented descriptively. Activated carbon from red onion peel was successfully produced through physical activation (400 °C) and chemical activation (H₃PO₄) with concentration variations A (8%), B (12%), C (16%), and D (20%). The characterization results showed a decrease in moisture content, ash content, and volatile matter content, while the carbon content increased. Sample D met the requirements of SNI 06-3730-1995 for all physical and chemical characteristics. An increase in adsorption ability for acid value was observed in line with the increase in activator concentration. The ability to reduce peroxide value decreased in samples C and D compared to sample B, but still met the SNI 3741:2013 standard. The most optimal characterization and adsorption performance were obtained in sample D, with an acid value of 0.33% (mg KOH/kg) and a peroxide value of 8 (meq O₂/kg).
Pemanfaatan Pati Kentang dan Selulosa Batang Jerami Padi sebagai Bahan Baku Pembuatan Bioplastik yang Ramah Lingkungan Nasution, Mutia Fadilah; Daulay, Abdul Halim; Lubis, Ridwan Yusuf
Panthera : Jurnal Ilmiah Pendidikan Sains dan Terapan Vol. 6 No. 1 (2026): January
Publisher : Lembaga Pendidikan, Penelitian, dan Pengabdian Kamandanu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36312/panthera.v6i1.1020

Abstract

This study aims to overcome the weaknesses of starch-based bioplastics by utilizing cellulose extracted from rice straw stalks. The increasing amount of conventional plastic waste that is difficult to decompose has created an urgent environmental problem, so that bioplastics have emerged as an environmentally friendly alternative. However, bioplastics from potato starch have low water resistance and less than optimal mechanical properties. Rice straw stalks were chosen because of their abundant availability and high cellulose content (32-47%). The process of making bioplastics was carried out with variations in the composition of potato starch and rice straw stalk cellulose (100%: 0%; 87.5%: 12.5%; 75%: 25%; and 62.5%: 37.5%), with the addition of chitosan (2 g) and glycerol (2 ml) as additives. The characterizations conducted included water absorption test (ASTM D570-98), biodegradation test, tensile strength test (ASTM E8M), percent elongation (ASTM D882-12), and identification of functional groups using FTIR (Fourier Transform Infrared). The results showed that the addition of rice straw cellulose had a positive effect on the characteristics of bioplastics. The best water absorption test was obtained in sample C (75% Starch: 25% Cellulose) with a value of 13% which meets the ASTM D570-98 standard. The best biodegradation test was obtained in sample B (87.5% Starch: 12.5% ​​Cellulose) with a value of 62%. The maximum tensile strength value was recorded at 1.23 MPa in sample C, and the maximum percent elongation value was 99.2% in sample D. FTIR analysis confirmed the presence of main functional groups (O-H, C-H, N-H, C-O) which indicated an effective interaction between potato starch, rice straw cellulose, and chitosan. Overall, this composite bioplastic shows optimal potential and characteristics as an environmentally friendly material.
Pengaruh Penambahan Asam Oleat terhadap Karakteristik Nanopartikel Magnetit dengan Metode Kopresipitasi Damayanti, Della; Lubis, Ridwan Yusuf; Daulay, Abdul Halim
Panthera : Jurnal Ilmiah Pendidikan Sains dan Terapan Vol. 6 No. 1 (2026): January
Publisher : Lembaga Pendidikan, Penelitian, dan Pengabdian Kamandanu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36312/panthera.v6i1.1043

Abstract

This study discusses the use of natural iron sand in the manufacture of magnetite nanoparticles with oleic acid. The purpose of the study is to produce nano-sized magnetite as an alternative photocatalyst material. Magnetite nanoparticles were synthesized with variations of oleic acid (0.75 ml, 1.5 ml, 2.25 ml, 3 ml) and the addition of 7.5 ml of diethylamine. Synthesis was carried out using XRF to determine the elements contained in the iron sand, SEM to determine the surface morphology, and UV-Vis to determine the size of the bandgap. The results showed that increasing the oleic acid content significantly increased agglomeration due to the large number of particles that merged with each other, while increasing the bandgap value. The results showed that the addition of oleic acid had an effect on the iron sand. The highest XRF test of 88.234% was obtained in the iron sand sample before processing, the lowest SEM test was 0.9 μm, and the highest UV-Vis test was 2.644 eV indicating an increase in the bandgap energy value due to the role of oleic acid as a surfactant. The novelty of this research lies in the use of natural iron sand combined with a fixed proportion of oleic acid (up to 3 ml) and diethylamine (7.5 ml). A good bandgap for the photocatalyst is 2.638 eV which is influenced by the addition of oleic acid as a surfactant. These magnetite nanoparticles show optimal potential and characteristics as photocatalyst materials.
Pengaruh Penggerusan Terhadap Struktur dan Ukuran Partikel dari Pasir Besi Sungai Alam Jaya Kabupaten Deli Serdang Siregar, Alfia Delmi; Nasution, Nazaruddin; Lubis, Ridwan Yusuf
JISTech (Journal of Islamic Science and Technology) Vol 10, No 2 (2025)
Publisher : UIN Sumatera Utara Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30829/jistech.v10i2.27468

Abstract

Penelitian ini bertujuan untuk mengetahui karakteristik pasir besi dari Sungai Alam Jaya, Kabupaten Deli Serdang, serta pengaruh proses penggerusan terhadap ukuran partikel dan kemurnian material. Sampel pasir besi diambil langsung dari lokasi penelitian kemudian melalui tahap preparasi berupa penjemuran, pemisahan menggunakan magnet permanen, pencucian dengan larutan HCl dan NH₄OH, serta pengeringan dalam oven pada suhu 200°C. Proses karakterisasi dilakukan menggunakan X-Ray Diffraction (XRD), Particle Size Analyzer (PSA) dan X-Ray Fluorescence (XRF). Hasil XRD menunjukkan bahwa fasa utama pasir besi adalah magnetit (Fe₃O₄) dengan struktur kristal kubik yang stabil. Berdasarkan hasil PSA, ukuran partikel rata-rata menurun dari 5,33806 µm menjadi 2,27004 µm setelah penggerusan, yang menunjukkan peningkatan kehalusan dan homogenitas partikel. Analisis XRF memperlihatkan bahwa kadar unsur Fe meningkat dari 76,577% menjadi 80,048%, sedangkan unsur pengotor seperti Si, Al, dan Mg mengalami penurunan. Berdasarkan hasil tersebut, dapat disimpulkan bahwa pasir besi dari Sungai Alam Jaya memiliki kadar Fe tinggi, struktur kristal stabil, serta ukuran partikel yang halus, sehingga berpotensi digunakan sebagai bahan dasar material magnetik maupun logam.
Pengaruh Suhu Sintering Terhadap Morfologi Dan Bandgap Nanokomposit Fe3o4/Sio2/Tio2 Dengan Metode Kopresipitasi Ridwan Yusuf Lubis; Ahya Zaelani; Miftahul Husnah; Ali Affan Silalahi
Jurnal Teori dan Aplikasi Fisika Vol. 14 No. 01 (2026): Jurnal Teori dan Aplikasi Fisika
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v14i01.577

Abstract

Fe₃O₄, TiO₂, and SiO₂ nanocomposite materials have been extensively investigated for their potential in various physical and environmental applications, particularly in the photocatalytic degradation of textile wastewater containing toxic organic dyes such as Methylene Blue. This study aims to determine the effect of sintering temperature on the morphology and bandgap energy of Fe₃O₄/TiO₂/SiO₂ nanocomposites synthesized using the coprecipitation method. The synthesized samples were subjected to sintering at temperatures of 500 °C, 550 °C, and 600 °C. Characterization was performed using Scanning Electron Microscopy (SEM) to observe morphological changes and Ultraviolet–Visible (UV–Vis) spectrophotometry to determine the bandgap energy. The SEM results revealed that higher sintering temperatures led to increased agglomeration and grain size, with the dominant particle size ranging between 0.22 µm and 0.24 µm. Furthermore, an increase in grain size correlated with a slight rise in bandgap energy from 2.35 eV to 2.37 eV, attributed to the widening separation between the valence and conduction bands. Among all samples, the FST500 nanocomposite (sintered at 500 °C) exhibited the most optimal properties, characterized by smaller agglomeration, finer grain size, and lower bandgap energy. These findings demonstrate that sintering temperature plays a crucial role in controlling the structural and optical properties of Fe₃O₄/TiO₂/SiO₂ nanocomposites for potential photocatalytic applications in wastewater treatment. Keywords: Fe3O4/TiO2/SiO2, Coprecipitation, Sintering Temperature, Morphology, Bandgap Energy  
Karakterisasi Pasir Besi (Fe3O4) Sungai Seruai Kabupaten Deli Serdang Yusuf Lubis, Ridwan; Maharani Rangkuti, Dea; Lubis, Haryati; Masthura; Husnah, Miftahul
Jurnal Ilmu Fisika dan Pembelajarannya (JIFP) Vol 7 No 2 (2023): Jurnal Ilmu Fisika dan Pembelajarannya (JIFP)
Publisher : Program Studi Pendidikan Fisika, UIN Raden Fatah Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19109/jifp.v7i2.19858

Abstract

In this research, iron sand was obtained from the Sei Serayu river in Deli Serdang Regency. The method for extracting iron sand is by manual extraction using a permanent magnet. The samples that have been obtained are then given temperature treatment with variations of 500 o C, 600 o C and 700 o C so that the iron sand undergoes oxidation. Next, the samples that have been heat treated are characterized using XRD, SEM and XRF. From the XRD test results it was found that the sample consisted of Fe3O4 with a magnetite phase. XRD diffraction peaks were obtained at angles 2θ: 17.26 o, 29.98 o, 35.4 o, 43.16 o, 57.08 o, and 62.56 o. SEM test results show that sample D contains magnetite (Fe3O4) with a silver color. Based on the analysis of test results, it can be concluded that the most optimal results are found in sample D with a sintering temperature of 700o C.
Pengaruh Pemisahan Bertingkat Terhadap Kemurnian dan Karakteristik Pasir Besi dari Sungai Sembahe Deli Serdang Miftahul Husnah; Siti Aulia Hutauruk; Rabiatul Awiyah; Chalista Dwi Putri; Ridwan Yusuf Lubis
JISTech (Journal of Islamic Science and Technology) Vol 11, No 1 (2026)
Publisher : UIN Sumatera Utara Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30829/jistech.v11i1.28910

Abstract

Pasir besi merupakan material alami yang mengandung mineral oksida besi dan umumnya terdapat di wilayah pesisir pantai maupun di aliran sungai yang terbentuk dari proses pelapukan batuan di daerah hulu. Ketersediaannya yang melimpah menjadikan pasir besi sebagai bahan baku yang penting dalam berbagai industri, seperti industri logam, pembuatan baja, serta bahan material magnetik yang digunakan dalam pengembangan teknologi modern. Penelitian ini bertujuan untuk menganalisis pengaruh pemisahan magnetik bertingkat dan perlakuan panas terhadap kemurnian serta karakteristik pasir besi dari Sungai Sembahe, Deli Serdang. Hasil penelitian menunjukkan bahwa peningkatan jumlah tahapan pemisahan magnetik menurunkan kehilangan massa dari 0,97% (5 kali) menjadi 0,15% (11 kali), yang mengindikasikan berkurangnya kandungan pengotor. Analisis FTIR menunjukkan adanya gugus Fe–O pada 562 cm⁻¹ yang semakin dominan seiring meningkatnya jumlah pemisahan. Pola XRD menunjukkan puncak utama pada 2θ ≈ 35,47° yang berkaitan dengan bidang kristal (311), yang mengindikasikan dominasi fase magnetit (Fe₃O₄). Hasil SEM menunjukkan bahwa partikel mengalami aglomerasi dengan ukuran berkisar antara 10–80 µm. Analisis EDS menunjukkan bahwa kandungan Fe mencapai 81,98% atom pada sampel dengan 11 kali pemisahan magnetik. Hasil ini menunjukkan bahwa pemisahan magnetik bertingkat efektif dalam meningkatkan kemurnian pasir besi, meskipun masih terdapat keterbatasan dalam menghilangkan pengotor berukuran halus.
Co-Authors ., Masthura Abdul Halim Daulay Ahya Zaelani Aiysah Hannum Pulungan Ali Affan Silalahi Amalia, Fadiah Nur Arif Amri Panggabean Arnydhinata, Ella Ayu Amalya Rahma Ayu Dwi Retno Basri Btr, Mhd Hasan Br Situmorang, Dinda Agelia Cahyani, Rahmatika Fitri Chalista Dwi Putri Della Damayanti, Della Devi khairani Ety Jumiati Ety Jumiati Fahmijal Lb Fatya Sheila Husna Fazira, Natasya Aulia Hakim, Ibnu Harahap, Balkis Br Hayatul Hasanah Insani, Rizki Jihan Nabila Jumiati, Ety Jumiati, Ety Khairani, Suci Khairunnisa, Umi Khairunnisa Kholidah Agustina Lailatul Husna Br Lubis Lailatul husna lubis Lenni, Nurma Lili Anriani Harahap Lisa Astari Lisa Astari Lubis, Hariyati Lubis, Haryati Lubis, Hilwa Salsabila Maharani Rangkuti, Dea Mahyuda, Maulana Masthura Miftahul Husnah Miftahul Husnah Miftahul Husnah Mulkan Iskandar Nasution Mulkan Iskandar Nasution Mutiara Sani Nasution, Fajar Siddik Nasution, Mutia Fadilah Nasution, Nazaruddin Nasution, Nazaruddin Natasya, Kinanty Desiva Nazaruddin Nasution Noviansyah, Kiki Nur Aisah Sagala Nurlisa, Siti Putri, Eka Julia Rabiatul Awiyah Rambe, Khoirunnisa Fadila Ratni Sirait Ratni Sirait Ratni Sirait, Ratni Rizqi Dwi Nugraha Safina, Nurul Sariah, Jati Nur Silalahi, Ali Affan Sirait, Ratni Sirait Siregar, Alfia Delmi Siti Aulia Hutauruk Siti Khairani Sinaga, Siti Khairani Sitompul, Yusril Padli Sonia Tampubolon Syahrani, Vania Retna Tiara, Finky Manda Yolanda Afifa