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All Journal JeLAST : Jurnal Teknik Kelautan , PWK , Sipil, dan Tambang Journal of Community Service and Empowerment Indonesian Journal of Chemical Studies (Indones. J. Chem. Stud.)
Kurniadi, Tedi
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Chemistry Civil Engineering, Building, Construction & Architecture Social Sciences Other

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A Critical Technology Implementation of Sodium Solid-state Battery as the Secure Long-Duration Energy Storage toward the Terra-Watt Grid Projects Kurniadi, Tedi; Fahri, Mirad; Aurellia, Fidela; Nurrosyid, Naufan
Indonesian Journal of Chemical Studies Vol. 1 No. 2 (2022): Indones. J. Chem. Stud., December 2022
Publisher : Indonesian Scholar Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (892.167 KB) | DOI: 10.55749/ijcs.v1i2.17

Abstract

The current lithium-ion battery (LIB) has become a vital technology for realizing a highly-productive society. The current system can be found easily in every personal electronic device, such as smartphones, laptops, smartwatches, and digital cameras. However, the future of LIBs is questionable due to the scarcity and security issues. The common electrolytes in this system are highly flammable, toxic, and easy to leak. Thus, inherit them to be applied for more mass-reliable energy sources, the terra-watt projects. Therefore, the development of an all-solid-state battery based on earth-abundant and cost-effective processing should be carried out immediately to dominate the market and for future civilization. Herein, we promoted a Sodium solid-state battery (SSB) that potentially be a key in energy storage technology due to its mechanical properties, electrochemical stability, high ion conductivity, and robust cyclic performance. Furthermore, a five-year direct implementation strategy of SSB was also presented, constructed from sodium and chromium electrodes.
Reaction Mechanism in Standardized α-Cellulose Content Test: Study from Boehmeria nivea Fiber Rahmawati, Fani; Basuki, Rahmat; Fahri, Mirad; Apriliyanto, Yusuf Bramastya; Kurniadi, Tedi; Nareswari, Vania Agatha; Sandri, Azzahra; Istiqomah, Tiara
Indonesian Journal of Chemical Studies Vol. 3 No. 1 (2024): Indones. J. Chem. Stud., June 2024
Publisher : Indonesian Scholar Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55749/ijcs.v3i1.45

Abstract

In defense industry, α-cellulose is the main component of nitrocellulose propellant. However, a detailed description of the reaction mechanism of each treatment step in SNI 0444-2009 is still very scarce. This study addresses this gap by presenting the reaction mechanisms of each treatment and the symbols used in the SNI 0444-2009 procedure. The separation of lignin from α-cellulose occurred by breaking the C‒O bond linking them. This bond was broken by the ‒OH group of NaOH via a hydrolysis reaction. The reaction was initiated with the elimination of a hydrogen atom from the lignin structure by the hydroxyl ion (‒OH), and the C‒O bond was broken by a hydrolysis reaction. The breaking of this bond was indicated by the disappearance of the IR peaks at wavenumbers 1049 and 1190 cm–1 in the filtrate after extraction. The SNI 0444-2009 method for the α-cellulose content test was carried out by a redox back titration of Cr(VI) with Fe(II) from ferrous ammonium sulfate. This titration was conducted to calculate the amount of Cr(VI) ions in potassium dichromate or Cr(VI) that did not react with lignin or beta cellulose in the filtrate. Understanding the contribution and reaction mechanisms of each compound involved in the SNI 0444-2009 procedure contributed to obtaining accurate data on α-cellulose content. In this study, the calculated α-cellulose content of the flax fiber was 96.75%. Furthermore, the detailed mechanism of the redox reaction was discussed in detail in this paper.
Enriching of society’s understanding of command-oriented leadership through an interactive virtual discussion Fahri, Mirad; Stiawan, Elva; Ariyanti, Dita; Basuki, Rahmat; Apriliyanto, Yusuf Bramastya; Hasibuan, Anggi Khairina Hanum; Kurniadi, Tedi; Putra, M. Sulthon Nurharmansyah; Septaningsih, Dewi; Tiarani, Sekar Ilma; Mayori, Ersha; Wiana, Regita Andriani; Yunita, Amalia; Nurrosyid, Naufan; Prasojo, Agus Eko; Putri, Riyanti
Journal of Community Service and Empowerment Vol. 5 No. 2 (2024): August
Publisher : Universitas Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jcse.v5i2.27961

Abstract

In the post-pandemic era, many interactive activities have been flexibly generated through virtual conditions. Accordingly, some problems could appear in terms of leadership, such as difficulties in maintaining the audience’s attention during the event. Thus, the utilization of a command-based leadership style that could straightforwardly maintain audience focus ought to be considered to be adopted. However, both the command-based leadership style and its prospective aspects have not been widely understood by society. This community service aims to deliver a proper understanding of the command-based leadership style through interactive virtual discussion between experts in teaching activities of defense-based science and society consisting of Indonesian teachers, high school students as well as academics. Statistical results of pre-test and post-test scores showed enhancement of the participants’ understanding of command-based leadership. Hopefully, some relevant aspects of their new perspective of command-based leadership can be properly adopted and effectively implemented to answer current challenges, such as in terms of managing people in virtual conditions. 
PENENTUAN JENIS TANAMAN YANG SESUAI UNTUK LAHAN PERTANIAN DI KABUPATEN MEMPAWAH BERDASARKAN INDEKS POTENSI LAHAN Kurniadi, Tedi; Soeryamassoeka, Stefanus Berlian; Irwansyah, Muhammad Azhar
JeLAST : Jurnal Teknik Kelautan , PWK , Sipil, dan Tambang Vol 10, No 3 (2023): JeLAST Edisi Agustus 2023
Publisher : JeLAST : Jurnal Teknik Kelautan , PWK , Sipil, dan Tambang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/jelast.v10i3.69048

Abstract

Pertanian memiliki peran dalam memenuhi kebutuhan pangan dan menggerakkan ekonomi lokal. Penelitian ini bertujuan untuk memetakan kesesuaian lahan di Kabupaten Mempawah berdasarkan indeks potensi lahan dan menentukan tingkat kesesuaian lahan terhadap jenis tanaman pangan yang potensial di setiap Kecamatan. Metode yang digunakan yaitu melakukan analisis overlay dengan bantuan aplikasi GIS untuk menghasilkan peta potensi lahan berdasarkan harkat indeks potensi lahan yang didapat. Kemudian analisis kesesuaian lahan untuk mengetahui kesesuaian lahan untuk tanaman pangan khususnya tanaman padi, jagung, kedelai dan kacang tanah. Berdasarkan indeks potensi lahan, daerah Kabupaten Mempawah didominasi oleh IPL dengan kategori sedang yang berarti dapat digunakan untuk segala usaha pertanian khususnya pada daerah kec. Toho, Anjungan, dan Mempawah Timur. Berdasarkan hasil lab uji tanah Kabupaten Mempawah, analisis kesesuaian lahan menunjukkan Kecamatan yang sangat sesuai (kategori S1) untuk tanaman padi adalah Kec. Siantan dan Mempawah Hilir. Kecamatan yang cukup sesuai (kategori S2) untuk tanaman jagung dan kedelai adalah Kec. Anjungan, Siantan, Segedong, Sungai Pinyuh, Mempawah Hilir, Mempawah Timur, dan Sungai Kunyit. Kecamatan yang sangat sesuai (kategori S1) untuk tanaman kacang tanah adalah Kec. Siantan dan Mempawah Hilir.Kata Kunci: indeks potensi lahan, kesesuaian lahan, pertanian kabupaten mempawah
Exploring the Potential of Carbon-based Radar Absorbing Material Innovations Fahri, Mirad; Bolilanga, Patricya Inggrid Wilhelmina; Gunaryo, Gunaryo; Stiawan, Elva; Kurniadi, Tedi
Indonesian Journal of Chemical Studies Vol. 3 No. 2 (2024): Indones. J. Chem. Stud., December 2024
Publisher : Indonesian Scholar Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55749/ijcs.v3i2.56

Abstract

This review explored the potential of carbon-based radar-absorbing materials (RAM), which had gained significant attention due to their superior properties and performance. In response to the growing demand for stealth technology in the military and civilian sectors, traditional radar-absorbing materials encountered limitations: weight, cost, and effectiveness. Carbon-based materials, such as carbon nanotubes, graphene, and various composites, offered lightweight, flexible, and tunable solutions that enhanced electromagnetic wave absorption across a wide frequency range. This paper examined the underlying mechanisms of radar wave absorption in carbon-based materials, highlighting their advantages over conventional options. In addition, recent advancements in fabrication techniques, including 3D printing and hybrid composite development, were also discussed, emphasizing their role in optimizing performance and sustainability. By synthesizing current research findings, this review aimed to provide a comprehensive understanding of the carbon-based RAM potential in advancing the future of stealth technology. Ultimately, this study presented insights that contribute to the continuing investigation in advanced materials science, suggesting a potential way to develop materials that can enhance radar absorption capabilities and extend their applications in modern technology.
Copolymerization of Tapioca Starch Waste through Grafting of Acrylic Acid Monomer with Cerium(IV) Initiator as Super Absorbent Polymer (SAP) Candidate Kurniadi, Tedi; Prasojo, Agus Eko; Putri, Riyanti; Nurwanto; Hartono, Rudi; Atmadi
Indonesian Journal of Chemical Studies Vol. 4 No. 2 (2025): Indones. J. Chem. Stud. December 2025
Publisher : Indonesian Scholar Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55749/ijcs.v4i2.81

Abstract

Indonesia, one of the world's largest tapioca starch producers, generates abundant cassava starch waste (onggok) that remains underutilized. This study aimed to enhance the value of onggok by synthesizing a superabsorbent polymer (SAP) through graft copolymerization using acrylic acid monomer and cerium(IV) initiator. Grafting was optimized by varying monomer concentrations (10–40% w/w) while maintaining the initiator concentration at 1.70% (w/w) and a reaction temperature of 53 °C. The optimal grafting occurred at 20% monomer concentration, yielding a grafting percentage of 14.83% and a monomer conversion of 74.15%. FTIR analysis showed increased absorbance ratios of –OH to C=O functional groups, confirming successful grafting. SEM images revealed a transformation from granular to porous structures, while DSC analysis demonstrated a shift in gelatinization temperature from 45.91 °C (raw onggok) to 46.69 °C (grafted), and retrogradation temperature from 140.67 °C to 141.67 °C. The water absorption capacity of the grafted copolymer reached 4.2450 g/g (5.20 g total), nearly double that of raw onggok (2.2716 g/g or 3.20 g), confirming its effectiveness as a SAP material.
Co-Authors ANGGI KHAIRINA HANUM HASIBUAN ARIYANTI, DITA Atmadi Aurellia, Fidela Bolilanga, Patricya Inggrid Wilhelmina Elva Stiawan Fahri, Mirad Gunaryo, Gunaryo Hartono, Rudi Istiqomah, Tiara Mayori, Ersha Muhammad Azhar Irwansyah Nareswari, Vania Agatha Nurrosyid, Naufan Nurwanto Prasojo, Agus Eko Putra, M. Sulthon Nurharmansyah Putri, Riyanti Rahmat Basuki Rahmawati, Fani Sandri, Azzahra Septaningsih, Dewi Stefanus Barlian Soeryamassoeka Tiarani, Sekar Ilma Wiana, Regita Andriani Yunita, Amalia Yusuf Bramastya Apriliyanto