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All Journal JPSE (Journal of Physical Science and Engineering) Metal Indonesia Jurnal TAMBORA JURNAL TEKNIK Specta Journal of Technology Bima Abdi: Jurnal Pengabdian Masyarakat Jurnal Pijar MIPA JURNAL TEKNIK INDUSTRI Hexagon
Fauzi Widyawati
Metallurgical Engineering Study Program, Faculty Of Environmental And Mineral Technology, Sumbawa University Of Technology
Aerospace Engineering Agriculture, Biological Sciences & Forestry Astronomy Automotive Engineering 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 Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Other

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Pengaruh Komposisi Serat Sisal Terhadap Konduktivitas Termal Dan Penyerapan Suara Papan Komposit fatma, fatmawati hendrik; Widyawati, Fauzi
Hexagon Vol 5 No 1 (2024): HEXAGON - Edisi 9
Publisher : Fakultas Teknologi Lingkungan dan Mineral - Universitas Teknologi Sumbawa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36761/hexagon.v5i1.3250

Abstract

Konduktivitas termal dan penyerapan suara adalah dua karakteristik kunci dalam pengembanganmaterial komposit yang inovatif. Konduktivitas termal mencerminkan kemampuan bahan untukmenghantarkan panas dari satu tempat ke tempat lainnya, sementara penyerapan suara menunjukkankemampuan material untuk menyerap gelombang suara. Papan komposit semakin diminati dalamberbagai aplikasi, terutama dalam industri furnitur, karena mampu menciptakan material dengan sifatunggul yang melebihi material tunggal yang digunakan dalam pembuatannya. Penelitian sebelumnyatelah mengidentifikasi potensi serat alami sebagai penguat dalam papan komposit karena sifatnya yangramah lingkungan dan dapat terdegradasi secara alami. Namun, penelitian yang memadukankonduktivitas termal dan penyerapan suara pada papan komposit dengan serat alami masih terbatas.Penelitian ini bertujuan untuk mengeksplorasi pengaruh variasi komposisi serat sisal pada konduktivitastermal dan penyerapan suara pada papan komposit. Serat sisal dipilih sebagai penguat karena memilikisifat ramah lingkungan, densitas rendah, kekuatan spesifik, dan modulus yang tinggi. Hasil penelitianmenunjukkan bahwa konduktivitas termal papan komposit meningkat secara signifikan pada fraksivolume 10% hingga 30% serat sisal. Distribusi serat sisal yang merata dalam matriks komposit danorientasi serat yang baik meningkatkan efisiensi transfer panas dalam komposit. Pengujian penyerapansuara menunjukkan bahwa papan komposit dengan fraksi volume 30% serat sisal memiliki koefisienserap suara tertinggi, yaitu 0,494 pada frekuensi 200 Hz. Sebaliknya, papan komposit dengan fraksivolume 10% serat sisal memiliki koefisien serap suara terendah, yaitu 0,059 pada frekuensi 800 Hz.Penelitian ini mengungkapkan potensi papan komposit dari serat sisal sebagai alternatif bahan yangramah lingkungan dengan sifat konduktivitas termal yang baik dan kemampuan penyerapan suara yangefektif. Hasil penelitian ini diharapkan dapat berkontribusi dalam pengembangan material kompositberkinerja tinggi untuk berbagai aplikasi, termasuk di bidang konstruksi dan furnitur. Penelitian lebihlanjut perlu dilakukan untuk mengoptimalkan kinerja material ini dan menjelajahi potensinya dalamindustri dan lingkungan yang lebih luas.
PENGARUH VARIASI VOLUME LIMBAH SERBUK KAYU MAHONI DENGAN PERLAKUAN ALKALI TERHADAP KEKUATAN MEKANIK DAN MIKROSTRUKTUR KOMPOSIT PARTIKEL fatma, fatmawati hendrik; Desiasni, Rita; Widyawati, Fauzi
Hexagon Vol 5 No 1 (2024): HEXAGON - Edisi 9
Publisher : Fakultas Teknologi Lingkungan dan Mineral - Universitas Teknologi Sumbawa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36761/hexagon.v5i1.3636

Abstract

Kekuatan sifat mekanik dan fisik material komposit partikel dipengaruhi oleh fraksi volume serbuk dan matriks. Variasi fraksi yang digunakan 30:70%, 50:50%, dan 70:30% dengan metode hand lay up. Perlakuan awal dilakukan dengan perendaman NaOH 2% selama 1 jam. Hasil pengujian mekanik MOE treatment mendapatkan nilai uji tertinggi pada fraksi volume serbuk 30:70% yaitu 6145,51 kgf/cm² dan nilai uji MOR tertinggi pada fraksi volume 30:70% yaitu 167,38 kgf/cm². Sedangkan nilai MOE non-treatment tertinggi pada fraksi volume serbuk 30:70% yaitu 5540,9 kgf/cm² dan nilai uji MOR tertinggi pada fraksi volume 30:70% yaitu 156,6 kgf/cm². Hasil pengujian sifat fisik kerapatan tertinggi pada fraksi volume serbuk treatment 30:70% sebesar 0,87 gr/cm³ dan kerapatan tertinggi pada fraksi volume serbuk non-treatment 30:70% sebesar 0,78 gr/cm³. Hasil uji mekanik MOE tidak memenuhi standar JIS A 5908-2003 sedangkan uji mekanik MOR dan uji fisik telah memenuhi standar JIS A 5908-2003. Hasil pengujian mikrostruktur menunjukkan bahwa pada fraksi volume serbuk treatment 30:70% terlihat partikel lebih kasar yang menyatu sempurna dengan matriks. Sedangkan pada fraksi volume serbuk non- treatment 30:70% terlihat partikel lebih halus dan serbuk dengan matriks seakan tidak merekat dengan baik hal ini karena lapisan lilin yang ada pada serbuk
PENGARUH VARIASI VOLUME LIMBAH SERBUK KAYU MAHONI TERHADAP KEKUATAN FISIK, MEKANIK DAN MIKROSTRUKTUR KOMPOSIT PARTIKEL Desiasni, Rita; Widyawati, Fauzi; Nabila, Maitsa Fikri; Saiful, Muhammad
Hexagon Jurnal Teknik dan Sains Vol 5 No 2 (2024): HEXAGON - Edisi 10
Publisher : Fakultas Teknologi Lingkungan dan Mineral - Universitas Teknologi Sumbawa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36761/hexagon.v5i2.4143

Abstract

The strength of the mechanical and physical properties of particle composite materials is influenced by the volume fraction of the powder and matrix. The pretreatment was carried out by soaking 2% NaOH for 1 hour. The results of the MOE treatment mechanical highest test value at the powder volume fraction of 30:70%, which was 6145.51 kgf/cm² and the highest MOR test value at the 30:70% volume fraction, which was 167.38 kgf/cm². Meanwhile, the highest non-treatment MOE value at the 30:70% powder volume fraction was 5540.9 kgf/cm² and the highest MOR test value at the 30:70% volume fraction was 156.6 kgf/cm². The results of the physical properties test were the highest density at the 30:70% powder volume fraction of 0.87 gr/cm³ and the highest density at the 30:70% non-treatment powder volume fraction of 0.78 gr/cm³. The results of the MOE mechanical test do not meet the JIS A 5908-2003 standard while the MOR mechanical test and physical test have met the JIS A 5908- 2003 standard. The results of microstructure testing showed that at a fraction of powder volume of 30:70% it was seen that the particles were coarser which blended perfectly with the matrix.
Fabrication of Fe3O4/PEG 4000/Oleic Acid Ferrofluids on Crystal Structure and Magnetic Properties Using Rhee Sumbawa Iron Sand Bahtiar, Syamsul; Islam, Izzul; Jayatri, Adella Ulyandana; Widyawati, Fauzi; Yanuar, Emsal
Jurnal Pijar Mipa Vol. 20 No. 1 (2025)
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA colaborates with Perkumpulan Pendidik IPA Indonesia Wilayah Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpm.v20i1.8108

Abstract

The fabrication of ferrofluid using Fe3O4 nanoparticles synthesized from Rhee Sumbawa iron sand has been successfully carried out. This fabrication was conducted to study the crystal structure characteristics and magnetic properties of the ferrofluid from Rhee iron sand. The fabrication used the co-precipitation method at room temperature to synthesise Fe3O4 nanoparticles. In contrast, the ferrofluid fabrication employed a magnetic stirrer with the addition of PEG 4000/Oleic Acid as a surfactant. The structure and magnetic characteristics of the Fe3O4/PEG 4000/AO ferrofluid will be investigated in this work. The results of the XRF characterization show an Fe content of 91.73%, indicating that the purity of Fe has been successfully increased using a permanent magnet separation method. The XRD characterization results show the formation of a cubic crystal system with lattice parameters a=b=c = 9.3797 Å, α=β=γ = 90°, and the crystal size obtained from the refinement is 8.42 nm. The TEM characterization results indicate that the morphology of the nanoparticles is spherical with a particle size of 7.34 nm. The VSM characterization results obtained the ferrofluid magnetization value in the 0.08–0.34 emu/g range.
PENGARUH PERSEN PADATAN DAN PENGGUNAAN OKSIDATOR H2O2 PADA PEROLEHAN KEMBALI EMAS DARI TAILING AMALGAMASI MENGGUNAKAN METODE KLORINASI BASAH Khairy, Kholida Tul; Sahrind, Muhammad; Bahtiar, Syamsul; Widyawati, Fauzi; Yanuar, Emsal; Suhaimi, Lalu
Hexagon Vol 6 No 1 (2025): HEXAGON - Edisi 11
Publisher : Fakultas Teknologi Lingkungan dan Mineral - Universitas Teknologi Sumbawa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36761/hexagon.v6i1.5357

Abstract

The leaching of gold from amalgamated tailings using the wet chlorination method has been successfully carried out. In this study, the gold leaching process was undertaken with percent solids varying at 10%, 15%, 20%, and 25% by using 30% H2O2 as an oxidizer. Subsequent leaching with 25% of solids without using 30% H2O2 oxidizer. For other operating conditions, it was kept constant with an operating temperature of 60°C, sample weight of 100 grams, and particle size of 200 mesh. The results showed that the highest gold recovery was 58.68% at 25% of solid. Meanwhile, the lowest gold recovery was 10.94% at 10% of solid. The use of H2O2 has a significant effect on the value of gold recovery, i.e using H2O2 the gold recovery is 58.68% compared to without using H2O2 of 1.15%.
Synthesis of Cellulose from Decorticated Sisal Plants (Agave sisalana) using the Acid Hydrolysis Method Widyawati, Fauzi; Hidayat, Syamsul; Wiradana, Aditya; Setyaningtyas, Ayunda Kinasih; Bahtiar, Syamsul; Yanuar, Emsal
Jurnal Pijar Mipa Vol. 20 No. 3 (2025)
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA colaborates with Perkumpulan Pendidik IPA Indonesia Wilayah Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpm.v20i3.8099

Abstract

Sisal Plant Production Process (Agave sisalana) produces waste of around 95%, which is wasted and can be an environmental problem because it is not processed properly. Sisal decortication waste contains active biochemical compounds, one of which is cellulose, which has the potential to be used in various fields. Cellulose is one of the most widely distributed and abundant biopolymers on Earth, as the main source of renewable materials obtained from plant fibers. Initial Treatment of Fiber Alkalization using 5% NaOH solution (1:20) for 2 hours at a temperature of 80 °C at a speed of 200 rpm. Then the bleaching process(bleaching). Samples of the results of alkalization treatment using hydrogen peroxide solution (H2THE23%) at a temperature of 80 °C for 3 hours, repeated once. In the Acid Hydrolysis process, the resulting sample is bleached with acid using sulfuric acid (H2SO465%) at a temperature of 80 °C for 1 hour (1:20). Sample Characterization Fiber characterization using the NDF test to determine cellulose content. The results of the cellulose content test in sisal fiber decortication waste were 1.545 mg/L Based on the results of the study, nanocellulose with a high % crystallinity was successfully extracted from sisal fiber decortication waste using a chemical treatment method. The FTIR spectrum shows a broad band at 3358-3410 cm-1which is the vibration of the OH group of cellulose. The removal of lignin levels was successfully carried out, showing that the peak of the spectrum band produced was only 1279.26 cm-1. The average size of nanocellulose particles is around 10-30 nm and consists of 30-100 cellulose molecules.
Preparation of synthesis nanoparticles Fe3O4 based on iron sand Sumbawa Bahtiar, Syamsul; Widyawati, Fauzi; Yanuar, Emsal; Ramadhan, Risky; Zahra, Karen; Hidayat, Syamsul
Jurnal Pijar Mipa Vol. 18 No. 6 (2023): November 2023
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA colaborates with Perkumpulan Pendidik IPA Indonesia Wilayah Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpm.v18i6.5644

Abstract

Iron sand generally contains minerals such as ilmenite, magnetite, and hematite. Based on the results of previous tests, the main composition of iron sand in Rhee, Sumbawa regency, is magnetite. One method to increase the Fe content in iron sand is by pre-treatment with NaOH. NaOH is also used to precipitate heavy metals in a mineral. In this study, three variations were carried out with the ratio of NaOH: iron sand, namely: 1: 4, 2: 4, and 3: 4 at a temperature of 300 C. Furthermore, the calcination results were followed by the synthesis of Fe3O4 nanoparticles using the coprecipitation method. The results of the XRF characterization showed an increase in Fe levels after being processed by the alkalization treatment. The highest concentration was obtained in 1:4, with a Fe percentage of 91.1%. The results of the XRD characterization showed that the synthesis of Fe3O4 was successfully carried out with single phase Fe3O4 amlording to the data reference 96-9005839 forms and the space group F d -3 m. Crystal size analysis Using the Debey-Scherrer equation, the respective sizes were 12.7 nm, 8.71 nm, and 9.76 nm, respectively.
Waste cellulose extraction and analysis decortication sisal plant (Agave sisalana) Sumbawa Labangka Widyawati, Fauzi; Malik Fajar Fatoni; Emsal Yanuar; Hidayat, Syamsul
Jurnal Pijar Mipa Vol. 18 No. 6 (2023): November 2023
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA colaborates with Perkumpulan Pendidik IPA Indonesia Wilayah Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpm.v18i6.6065

Abstract

Waste utilization of decortication Sisal plants is minimal compared to the amount of waste produced, especially the cellulose content in the waste decortication sisal plant. This research aims to extract waste cellulose decortication sisal plants using acid and alkaline solutions with variations in NaOH solutions of 0%, 2%, 4%, 6%, and 8%. The process used is alkalization, bleaching, and acid hydrolysis by method analysis. Next, testing using SEM and FTIR methods is done to determine the morphology of waste cellulose decortication in the resulting sisal plants and the cellulose, lignin, and hemicellulose content in the waste decortication sisal plant. Before treatment, the cellulose content of the waste is given to decorticate the sisal plant at 31%, and after alkalization treatment, the cellulose content is 54%. Cellulose content in waste decortication Sisal plants in each process increases with found O-H bonds at waves 3000-3600 cm-1, C-H bonds belong to hemicellulose at wave numbers 2800-3000 cm-1 and remove lignin, which is in the waste decortication Sisal plants did not find C=C bonds belonging to lignin at waves of 1200-1300 cm-1. FTIR test results show an increase in cellulose intensity, with the resulting cellulose measuring 28.64762 µm and 33.69369 µm. The increase in cellulose intensity in FTIR is directly proportional to the SEM results, which show a loose layer with lignin and hemicellulose that has been eroded from the cellulose.
Co-Authors Amirin Kusmiran Andani Nurul Hidayah Bahtiar, Syamsul Chandra, Rico Dian Anggreini fatma, fatmawati hendrik Fitriah Assyurah, Dwi Nurul Hermanto, Koko I Putu Widiantara Imam Wierawansyah Eltara izzul islam Jayatri, Adella Ulyandana Khairy, Kholida Tul Malik Fajar Fatoni Marano, Lino Maulana Malik Ibrahim Muhammad Hisyam Muhammad Nurdin Muhammad, Saiful Musbihin Musbihin Nabila, Maitsa Fikri Nur Azman Ramadhan, Risky Ridwan Tanjung Rita Desiasni Rita Desiasni Riza Monica Sahrind, Muhammad Setyaningtyas, Ayunda Kinasih Shinta Esabella Solahudin, Muhammad Miftah Supianto Cibro Syamsul Bahtiar Syamsul Bahtiar Syamsul Hidayat Syamsul Hidayat Syamsul Hidayat SYAMSUL HIDAYAT Wafdan Muzakki Wiradana, Aditya Yanti, Sahri Yanuar, Emsal Yuliana Fitri Sersaningsih Zahra, Karen