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All Journal Rekayasa Mesin PROSIDING SEMINAR KIMIA Jurnal Pengabdian Kepada Masyarakat (Indonesian Journal of Community Engagement) Indonesian Physical Review Jurnal Abdimas PHB : Jurnal Pengabdian Masyarakat Progresif Humanis Brainstorming DIKEMAS (Jurnal Pengabdian Kepada Masyarakat) Jurnal Metalurgi dan Material Indonesia Specta Journal of Technology PIKAT
Yunita Triana, Yunita
Institut Teknologi Kalimantan
Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Mechanical Engineering Physics Public Health Social Sciences Other

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CHARACTERIZATION OF GREEN-SYNTHESIZED COBALT OXIDE NANOPARTICLES USING Nigella sativa SEED EXTRACT Hizkia Alpha Dewanto; Sarah Toding; Irfan Riadin; Jatmoko Awali; Andi Idhil Ismail; Fredy Kurniawan; Yosua Anjupaian Situmeang; Yunita Triana
Indonesian Physical Review Vol. 9 No. 2 (2026)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v9i2.630

Abstract

Cobalt oxide nanoparticles (CoO NPs) were synthesized via green synthesis using Nigella sativa seed extract as a natural reducing and stabilizing agent. This approach enables environmentally friendly production of ultrafine nanoparticles while incorporating bioactive plant compounds. The CoO NPs were characterized using XRD, XRF, UV–Vis, FTIR, and TEM. XRD confirmed CoO formation with diffraction peaks at 2θ = 31.247°, 36.712°, 42.5°, 44.771°, 59.359°, 61.536°, 65.227°, 74.31°, and 76.111°, which are indexed to the (100), (111), (200), (102), (110), (103), (220), (311), and (222) planes of face-centered cubic (fcc) CoO. XRF showed cobalt as the main element (71.36 wt%) with minor P, S, K, Ca, Fe, Zn, Cu, Mn, and Ti. UV–Vis exhibited peaks at 320 nm and 344 nm, TEM revealed nearly spherical particles (1.72 nm with a standard deviation of 0.55 nm), and FTIR confirmed Co–O bonds (700–663 cm⁻¹) along with organic functional groups from the extract. The formation mechanism involves phytochemical-mediated bioreduction, surface stabilization, and producing well-dispersed CoO NPs. Overall, all characterization techniques consistently confirm the successful formation of highly crystalline, pure, and well-dispersed CoO nanoparticles with nanoscale dimensions. The combined results demonstrate that Nigella sativa extract effectively acts as both reducing and stabilizing agent, leading to stable CoO NPs suitable for potential applications in catalytic and functional material systems.
Analysis on the Improvement to the Mechanical Properties of ASTM A36 Using Spot Hardfacing Method Awali, Jatmoko; Rohimsyah, Fikan Mubarok; Ismail , Andi Idhil; Dewanto , Hizkia Alpha; Al-Shehan, Khulafaur Nawaf; Akram, Muhammad; Yusuf, Chiara; Triana, Yunita; Zulfikar, Ainun
Jurnal Rekayasa Mesin Vol. 17 No. 2 (2026)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/

Abstract

Hardfacing is considered to be an optimum, lightweight method to improve the strength of electrical vehicle chassis to be used in many places with variable road conditions in Indonesia, especially around the New National Capital (IKN) area. In this study, carbon steel (ASTM A36) plates were strengthened by spot hardfacing using an ER70S-6 electrode. Variables used in this study are weld dwelling time (4, 7, and 10 seconds with a constant distance of 30 mm) and spot distance (20, 30, and 40 mm with a 7 second dwelling time). From this study, the increase of dwelling time and the decrease of the spot distance enhanced the toughness of the specimens. Further observations discovered that both dwelling time increase and spot distance decrease correlated to the increase of the average grain size of the phases present in the specimens. The optimum variations observed in this research are 10 seconds dwelling time of 1,321-1,508 J/mm2 and 20 mm of spot distance of 1,312-1,456 J/mm2.
Co-Authors Ahmad Syaifuddin Ahmad Syaifuddin Ainun Zulfikar Al Habib, Irsyad Al-Shehan, Khulafaur Nawaf Ali, Shodikin Andromeda Ashadi Sasongko Asih Wentika Putri Kusuma Awali Jatmoko Azhary, Kartika Nerissa Batatta, Denada Yudhistira Darma, Daffa Irsyad Destiny, Keysi Devain Dewanto , Hizkia Alpha Dewanto, Hizkia Alpha Dharmawan Yudha Rizky Fadhilah, Hana’ Fitriyatul Qulub Fredy Kurniawan Fredy Kurniawan Fredy, Kurniawan Haliq, Ridhwan Hizam, Fadli Hizkia Alpha Dewanto Idhil Ismail, Andi Ika Ismail Ika Ismail Indrawati, Dini Irfan Riadin Ismail, Ika Jatmoko Awali Jatmoko Awali Jatmoko Awali Jatmoko Awali Jatmoko, Awali Jatmoko, Awali Kurniawan Fredy Laksono, Andromeda Dwi Leoriza, Meutya Dwi Lesmana, Muhammad Zidan Marippi, Alan Maulana, M. Arzil Miles, Austin Mohd, Yusairie Muhammad Akram Muhammad Rafli Muhammad Rifani, Muhammad Murni Handayani Muthia Putri Darsini Lubis Nabila, Najwa Olivier Aryatama Panji Pratama, Winardi Dian Wahyu Putra Parmita, Ade Wahyu Yusariarta Putra, Ade Wahyu Yusariarta Putri Ayu Tri Ashshofiah Rahajeng, Utami Putri Rinda, Sari Shaimah Rinda, Sari Shaimah Risky Setiani Putri Rizky Yoel Rizky, Dharmawan Yudha Rohimsyah, Fikan Mubarok Rudiyanto, Fahmi Rungsa, Yudianto Sarah Toding Sari Shaimah Rinda Sulistijono Sulistijono Sulistijono Sulistijono Sulistijono Sulistijono Sulitijono, Sulitijono Tajalla, Gusti Umindya Nur Tanjung, Rifqi Aulia Thesalonicha, Somalinggi Tri Paus Hasiholan Hutapea, Tri Paus Hasiholan Utami Putri Rahajeng Wentika Asih Yanti, Lisda Yosua Anjupaian Situmeang Yusuf, Chiara