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All Journal Science and Technology Indonesia Jurnal SOLMA Indonesian Journal of Chemistry Journal of Community Service and Empowerment Indonesian Journal of Chemical Studies (Indones. J. Chem. Stud.) Jurna Beta Kimia Babakti : Journal of Community Engangement Darmabakti: Jurnal Pengabdian kepada Masyarakat Sorption Studies Babakti: Journal of Community Engangement
Yusuf Bramastya Apriliyanto
Department of Chemistry, Bogor Agricultural University, Chemistry Building, Wing 1, 3rd Floor, Tanjung St., IPB Darmaga Campus, Bogor 16680, Indonesia
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Education Engineering Environmental Science Health Professions Materials Science & Nanotechnology Mathematics Physics Public Health Social Sciences Other

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Reflection Loss Improvement by Cerium Addition in Chitosan-Hydroxyapatite Film as Stealth Drone Candidate Riyanti Putri; Agus Eko Prasojo; Ardyan Lazuardy; Reza Anitasari; Fidela Aurellia Salsabila; Nugroho Adi Sasongko; Yusuf Bramastya Apriliyanto; Anggi Khairina Hanum Hasibuan; Dea Dwi Ananda
Indonesian Journal of Chemical Studies Vol. 4 No. 1 (2025): Indones. J. Chem. Stud., June 2025
Publisher : Indonesian Scholar Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55749/ijcs.v4i1.53

Abstract

Radar is a detection and tracking technology commonly applied to monitor environmental conditions. Its ever-growing capabilities pose a serious challenge to military operations because they increase the risk of being detected by the enemy. On the other hand, unmanned aircraft (drones) are increasingly widespread in gathering information. However, the effectiveness of this technology can be reduced due to exposure to radar waves that allow detection. Therefore, developing coating materials that can absorb radar waves is an urgent need to increase the effectiveness of military equipment. The composites developed were derived from chitosan obtained from crustacean waste, hydroxyapatite from eggshell waste, and the rare earth metal cerium obtained from Lapindo Mud. Composites containing cerium metal (Ce) have higher radar signal absorption capabilities than samples without Ce, as evidenced by VNA measurements showing increased absorbance in the 100 MHz - 8.5 GHz frequency range. SEM tests indicate that cerium particles increase the density and homogeneity of the pore structure, with a size range of 17–24 µm. FTIR characterization revealed that Ce was physically bound to the chitosan-HAp composite. Mechanically, the composite with Ce had a maximum tensile stress of 9.512 MPa and a strain of 9.512%, while without the addition of Ce, a stress of 9.529 MPa and a strain of 25.512% was obtained. These findings indicate that integrating rare earth metals in chitosan-HAp composites can improve the material's capability to absorb radar waves, thus having broad prospects for applications in defence technology.
Sosialisasi Pengelolaan Sampah dan Instalasi Pengolahan Air Limbah (IPAL) di Desa Muara Angke Minandre Wiratama; Gunaryo; Mentari Zikri Anty; Mirad Fahri; Anggi Khairina H H; Elva Stiawan; Rahmat Basuki; M. Sulthon Nurharmansyah P; Tedi Kurniadi; Dewi Anggraini S; Yusuf Bramastya A; Azimatur Rahmi; Aura Puja Lestari; Moch. Rizki Fajri
Babakti: Journal of Community Engangement Vol 2 No 1 (2025): April
Publisher : Fakultas Teknik, Universitas Singaperbangsa Karawang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35706/babakti.v2i1.13091

Abstract

Kesadaran Kebersihan dan Pengelolaan Sampah yang baik merupakan salah satu kebiasaan yang dapat berdampak pada kesehatan yang lebih baik. Kepedulian yang minim dalam menjaga lingkungan yang bersih diprediksi akan menimbulkan dampak buruk bagi lingkungan dan masyarakat. Selain itu, pengelolaan air bersih pada lingkungan merupakan salah satu hal yang perlu diperhatikan. Pengetahuan tentang pengolahan air bersih melalui Instalasi Pengelolaan Air Limbah (IPAL) akan memberikan dampak positif bagi keberlansungan air bersih di lingkungan masyarakat. Pengabdian kepada masyarakat ini dilakukan dengan Sosialisasi melalui pendekatan modal sosial. Pendekatan modal sosial dilakukan dalam pelaksanaan pengabdian kepada masyarakat dimana pendekatan ini digunakan sebagai wadah sosialisasi menjaga kebersihan lingkungan dan pengetahuan dalam pengolahan air bersih bagi msayarakat di Desa Muara Angke. Pengabdian kepada Masyarakat ini bertujuan untuk mensosialisasikan cara mengelola dan mengkategorikan macam-macam sampah, pengelolaan air bersih, dan desalinasi air yang dilakukan di daerah Muara Angke, Kecamatan Penjaringan, Jakarta Utara. Data dikumpulkan melalui observasi langsung dan kuesioner yang diisi oleh peserta sebelum dan sesudah program pelatihan. Hasil analisis menunjukkan bahwa kesadaran masyarakat meningkat yang dilihat dari hasil tes yang dilakukan menunjukkan peningkatan nilai dari materi yang di ujikan. Pendekatan yang tepat berhasil membangkitkan semangat dan komitmen warga yang tercermin dari tingginya tingkat partisipasi. Pelaksanaan kegiatan ini diharapkan memberikan pengetahuan dan kesadaran masyarakat dalam menjaga kebersihan lingkungan dan pengolahan air bersih.
Synthesis and Characterization of Carbon Dots (C-Dots) Derived from Tofu Dregs using Solvothermal Method Siti Nurhalimah; Anggi Khairina Hanum Hasibuan; Yusuf Bramastya Apriliyanto; Heriyandi Heriyandi; Bagas Putra Arfyansyah
Jurnal Beta Kimia Vol 6 No 1 (2026): Volume 6 Issue 1, May 2026
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/jbk.v6i1.27573

Abstract

Tofu dregs are an agroindustrial organic byproduct generated in large quantities and still contain carbon-rich compounds such as carbohydrates, proteins, and lipids. This carbon content makes tofu dregs a promising alternative precursor for the synthesis of value-added carbon-based materials, one of which is carbon dots (C-Dots). This study aims to synthesize C-Dots derived from tofu dregs using a solvothermal method and to characterize the optical properties, functional groups, morphology, and elemental composition of the resulting material. The synthesis of C-Dots was carried out using a solvothermal process involving heating in a closed system using tofu dregs and 96% ethanol as the solvent. Characterization was performed using UV–Visible (UV–Vis) spectrophotometry, Fourier Transform Infrared–Attenuated Total Reflectance (FTIR–ATR), and Scanning Electron Microscopy coupled with Energy Dispersive X-ray Spectroscopy (SEM–EDX). The UV–Vis analysis revealed an absorption band at approximately 451 nm, which is associated with π→π* electronic transitions in conjugated carbon structures, as well as a shoulder around 524 nm that can be attributed to n→π* transitions originating from lone pair electrons in oxygen-containing functional groups. FTIR analysis indicated the presence of O–H/N–H, C–H, C=C, C–O/C–O–C, and C–N functional groups on the surface of the C-Dots. Meanwhile, SEM analysis showed agglomerated particle morphology, and EDX results confirmed that the main constituent elements of the material are carbon (C), oxygen (O), and nitrogen (N). The results of this study demonstrate that tofu dregs have strong potential to be utilized as a biomass-derived precursor in the solvothermal synthesis of C-Dots.
Kolaborasi kampus–industri dalam program magang: Implikasi bagi pengembangan PT Dahana Aura Puja Lestari; Muhammad Hilman Haidar; Gunaryo Gunaryo; Yusuf Bramastya Apriliyanto; Latisa Stefi Alivia; Adrian Rezki Anggara
Darmabakti: Jurnal Pengabdian kepada Masyarakat Vol 2 No 1 (2025): November
Publisher : CV Rezki Media

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56003/darmabakti.v2i1.659

Abstract

The internship program is a form of experiential learning designed to bridge the gap between theoretical knowledge acquired in higher education and practical experience in the workplace. This study aims to evaluate the performance of internship students participating in the Magang Generasi Bertalenta (MAGENTA) program at PT Dahana. The evaluation seeks to provide a comprehensive overview of students' competencies, discipline, responsibility, and adaptability throughout the internship period. This research employed a descriptive qualitative method with a survey approach. The primary data collection instrument was a structured questionnaire distributed to field supervisors who assessed the interns' performance. The collected data were analyzed to determine the effectiveness of the internship program in enhancing students' professional skills and its impact on the workplace environment. The results indicated that, in general, the internship students demonstrated good performance, characterized by a high level of discipline, a strong sense of responsibility, and quick adaptability to the company's work culture. The MAGENTA program at PT Dahana has proven to be effective in developing students' competencies and strengthening the partnership between higher education institutions and the industrial sector.
Recent Advances in Nickel Ferrite-Polymer Nanocomposites for Radar Absorbing Material Applications Thesalonika Br Panjaitan; Alya Hijrianisa; Yusuf Bramastya Apriliyanto; Dea Dwi Ananda; Rahmat Basuki; Hotma Renta
Sorption Studies Vol. 1 No. 2 (2025): Sorption Studies, December 2025
Publisher : Indonesian Scholar Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55749/ss.v1i2.125

Abstract

Nickel ferrite (NiFe₂O₄) and its polymer-based composites have emerged as promising candidates for radar absorbing materials (RAMs) due to their unique combination of magnetic and dielectric loss mechanisms. This review highlights recent advances in synthesis strategies, including sol–gel, hydrothermal, co-precipitation, and microwave-assisted methods, which enable precise control of particle size, morphology, and crystallographic defects. Such control supports flexible structural design of nickel ferrite spinel structures, allowing dopant incorporation to tailor magnetic anisotropy and saturation magnetization. These structural features directly affect electromagnetic performance. Magnetic loss is mainly governed by natural resonance and, to a lesser extent, eddy current effects, while dielectric loss arises from dipole polarization, interfacial polarization, and conduction loss. The synergistic balance of magnetic and dielectric losses makes nickel ferrite–polymer nanocomposites promising broadband radar absorbing materials. The discussion emphasizes the role of cation substitution, polymer matrices, and hybridization with carbon-based materials in enhancing microwave absorption bandwidth and impedance matching. Various synthesis approaches, including sol–gel, hydrothermal, and in-situ polymerization, are compared with respect to their influence on particle size, morphology, and absorption efficiency. Challenges such as limited bandwidth, thermal and mechanical stability, and scalability are highlighted, along with potential solutions through advanced nanostructuring, multifunctional design, and sustainable synthesis. Future research directions are also outlined to support the development of next-generation stealth and electromagnetic interference shielding technologies.
Recent Advances in Neodymium as a Magnetic Nanoparticle Material Candidate for Microwave Absorption Dea Dwi Ananda; Thessa Octavia Joyetta Tarigan; Tiara Rizki Yulita; Kayla Sophia Putri; Hazzha Azzahra; Sultan Napoleon; Mayang Fauziah Putri Kuntjahjono; Almanda Naura Candra Putri; Muhammad Afif Aji Patria; Yusuf Bramastya Apriliyanto; Rahmat Basuki; Nugroho Adi Sasongko; Akhmad Rifai; Nuha Nuha
Sorption Studies Vol. 2 No. 1 (2026): Sorption Studies, Vol. 2 No. 1, June 2026
Publisher : Indonesian Scholar Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55749/ss.v2i1.145

Abstract

Magnets are materials that can attract or repel other objects due to the magnetic field generated by the arrangement of electron spin moments in atoms. One important magnetic material is magnetite (Fe₃O₄), which has been widely used and continues to be developed to meet the needs of modern technology. Innovation in material development is achieved through ion-substitution strategies, such as the use of the trivalent metal neodymium to replace Fe³⁺ in the ferrite structure. This strategy allows regulation of the microstructure and ion distribution in the crystal lattice, thereby significantly influencing the material's magnetic performance. Neodymium nanoparticles are known to exhibit superparamagnetic properties due to their tiny dimensions, so that each particle behaves as a single magnetic domain. These particles possess significant magnetic moments; however, their magnetization disappears once the external magnetic field is removed due to thermal fluctuations. The magnetic behavior of neodymium-based nanoparticles is strongly influenced by particle size, crystal structure, composition, and synthesis conditions. Based on theoretical calculations, neodymium exhibits a high magnetic moment due to its unpaired 4f electrons and strong spin–orbit coupling, with a magnetic spin moment of approximately 2.85 × 10⁻²² JT⁻¹. The characteristics of 4f electrons that are localized and protected by the outer shell produce strong spin-orbit coupling, contributing to a significant total magnetic moment and high crystal magnetic anisotropy. This phenomenon strongly aligns the magnetization along specific crystallographic directions, thereby stabilizing the magnetic orientation. This unique property makes neodymium a potential candidate for high-performance magnetic materials, including in high-frequency electromagnetic wave absorption technology. Nd-based magnetic materials exhibit enhanced microwave absorption performance through improved dielectric/magnetic losses and impedance matching, achieving reflection loss values below −40 dB with broad absorption bandwidths for electromagnetic shielding and radar absorbing applications.
Peningkatan Pengetahuan Petani tentang Ketahanan Pangan dan Paparan Bahan Kimia Pertanian di Desa Cimuncang, Sumedang Yosephine Liliana Intan Danar Saputri; Gunaryo Gunaryo; Minandre Wiratama; Fitria Rahma Dewi; Riana Zevanisa Arsyi; Sari Purbaya; Mentari Zikri Anty; Rahmat Basuki; Azimatur Rahmi; Anggi Khairina Hanum Hasibuan; Yusuf Bramastya Apriliyanto; Tedi Kurniadi; M. Sulthon Nurharmansyah Putra; Dewi Anggraini Septianingsih; Rudi Hartono; Nurwanto Nurwanto; Mirad Fahri
Jurnal SOLMA Vol. 15 No. 2 (2026)
Publisher : Universitas Muhammadiyah Prof. DR. Hamka (UHAMKA Press)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22236/solma.v15i2.21122

Abstract

Background: Ketahanan pangan dan keamanan bahan kimia merupakan aspek penting dalam pertanian berkelanjutan. Petani di Desa Cimuncang, Kabupaten Sumedang, masih memiliki pemahaman yang terbatas mengenai risiko penggunaan pupuk dan pestisida kimia serta alternatif ramah lingkungan. Kegiatan pengabdian kepada masyarakat ini bertujuan untuk meningkatkan wawasan dan pengetahuan petani mengenai ketahanan pangan, risiko paparan bahan kimia pertanian, dan alternatif pupuk organik berbasis senyawa humat di Desa Cimuncang. Metode: Sebanyak 40 petani mengikuti rangkaian kegiatan yang terdiri atas pre-test, penyuluhan, diskusi interaktif, dan post-test. Data dianalisis menggunakan uji t berpasangan untuk menilai perubahan pengetahuan peserta. Hasil: Peningkatan rata-rata skor dari 37% pada pre-test menjadi 82% pada post-test, dengan perbedaan yang bermakna secara statistik (p < 0,001) dan nilai effect size yang sangat besar (Cohen’s d = 4,51). Kegiatan penyuluhan efektif dalam meningkatkan pengetahuan dan kesadaran awal petani mengenai praktik pertanian yang lebih aman dan berkelanjutan. Kesimpulan: Kegiatan ini berhasil meningkatkan pengetahuan dan kesadaran petani terhadap pertanian ramah lingkungan. Kegiatan lanjutan berupa pendampingan lapangan diperlukan untuk memastikan penerapan pengetahuan tersebut dalam praktik pertanian sehari-hari
Co-Authors Adrian Rezki Anggara Agus Eko Prasojo Agus Eko Prasojo Akhmad Rifai Almanda Naura Candra Putri Alya Hijrianisa Amalia Yunita Anggi Khairina H H Anggi Khairina H H Anggi Khairina Hanum Hasibuan Anggi Khairina Hanum Hasibuan Anggi Khairina Hanum Hasibuan Anggi Khairina Hanum Hasibuan Anitasari, Reza Ardyan Lazuardy Arief Budi Santiko, Arief Budi Audrey Nur Aisyah Aura Puja Lestari Aura Puja Lestari Aura Puja Lestari Azimatur Rahmi Azimatur Rahmi Azimatur Rahmi Azzahra Sandri Bagas Putra Arfyansyah Bolilanga, Patricya Inggrid Wilhelmina Cahyorini Kusumawardani Dea Dwi Ananda Dea Dwi Ananda Dewi Anggraini S Dewi Anggraini S Dewi Anggraini Septianingsih Dewi Septaningsih Dita Ariyanti Elva Stiawan Elva Stiawan Elva Stiawan Fahri, Mirad Fidela Aurellia Salsabila Fitria Rahma Dewi Gunaryo Gunaryo Gunaryo Gunaryo Gunaryo Gunaryo Hazzha Azzahra Heriyandi Heriyandi Hotma Renta Ida Ayu Putu Sri Widnyani Istiqomah, Tiara Jati, Andreas Ary Chrisna Kayla Sophia Putri Kurniadi, Tedi Latisa Stefi Alivia Lazuardy, Ardyan M. Sulthon Nurharman Syah Putra Mayang Fauziah Putri Kuntjahjono Mayori, Ersha Mentari Zikri Anty Mentari Zikri Anty Mentari Zikri Anty Minandre Wiratama Minandre Wiratama Minandre Wiratama Mirad Fahri Mirad Fahri Mirad Fahri Mirad Fahri Moch. Rizki Fajri Moch. Rizki Fajri Muhammad Afif Aji Patria Muhammad Hilman Haidar Nareswari, Vania Agatha Naufan Nurrosyid Noviyan Darmawan Nugroho Adi Sasongko Nugroho Adi Sasongko Nugroho Adi Sasongko Nugroho Sasongko Jati, Nugroho Sasongko Nuha Nuha Nurrosyid, Naufan Nurwanto Nurwanto Prasojo, Agus Eko Putra, M. Sulthon Nurharmansyah Putri, Riyanti Rahmat Basuki Rahmat Basuki Rahmat Basuki Rahmat Basuki Rahmat Basuki Rahmat Basuki Rahmawati, Fani Raihansyah Raja Hutama Regita Andriani Wiana Reza Anitasari Riana Zevanisa Arsyi Riyanti Putri Riyanti Putri Rudi Hartono Sandri, Azzahra Sari Purbaya Sekar Ilma Tiarani Siti Nurhalimah Sulistioso Giat Sukaryo Sultan Napoleon Tedi Kurniadi Tedi Kurniadi Tedi Kurniadi Tedi Kurniadi Thesalonika Br Panjaitan Thessa Octavia Joyetta Tarigan Tiara Rizki Yulita Yosephine Liliana Intan Danar Saputri