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All Journal International Journal of Power Electronics and Drive Systems (IJPEDS) International Journal of Renewable Energy Development POSITRON Jurnal Sains dan Pendidikan Fisika Jurnal Ilmu Ternak Veteriner WARTAZOA Indonesian Bulletin of Animal and Veterinary Sciences PROFIT : Jurnal Administrasi Bisnis Jurnal Fisika Unand JFA (Jurnal Fisika dan Aplikasinya) PROSIDING SEMINAR KIMIA Jurnal Fisika FLUX JURNAL BIOLOGI INDONESIA International Research Journal of Business Studies (E-Journal) Jurnal Penelitian dan Pengkajian Ilmu Pendidikan: e-Saintika Indonesian Journal of Electrical Engineering and Computer Science Edunesia : jurnal Ilmiah Pendidikan Computational and Experimental Research in Materials and Renewable Energy (CERiMRE) Mechanical Engineering for Society and Industry Makara Journal of Science Jurnal Akuntansi Manado (JAIM) International Research Journal of Business Studies Journal of Engineering and Technological Sciences
Darminto .
Dept. Of Physics, Fac. Of Math. And Natural Sciences-Sepuluh November Institute Of Tech. Surabaya Kampus ITS Sukolilo, Surabaya 60111, Indonesia
Aerospace Engineering 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 Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Social Sciences Transportation Veterinary Other

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Journal : POSITRON

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Perluasan Kinerja Akustik Limbah Kayu Batang Kelapa Sawit Termodifikasi Bahan Formaldehida Manik, Tetti Novalina; Shaliha, Shaliha; Siregar, Simon Sadok; Santoso, Tanto Budi; Yahya, Iwan; Mashuri, Mashuri; Zainuri, Muhammad; Darminto, Darminto
POSITRON Vol 12, No 2 (2022): Vol. 12 No. 2 Edition
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam, Univetsitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (442.893 KB) | DOI: 10.26418/positron.v12i2.55963

Abstract

Chemical modifications for waste oil palm trunks had carried out as acoustic material. This modification was conducted in two stages. Firstly, formalization with formaldehyde solution and secondly is impregnation with melamine-formaldehyde resin. Formalization was conducted in alkaline condition (pH 10) for 3 days and 5 days. Impregnation was carried out under pressure 3 bar and 5 bar and held for an hour. For completed these modification, the samples was cured at 120oC for 10 minutes and then dried at (103±2)oC to reached moisture content of less than 6%. This modification has changed the chemical structure and the morphology of wood, as shown by the FTIR and SEM results. The samples became denser, stronger and more rigid. Furthermore, the mechanical and physical properties of modified wood are also increasing. The absorption coefficient decreases with increasing formalization time and impregnation pressure. Based on trend of absorption coefficient, BKS wood can be applicated as resonant absorber with work class from A to class B and D.
Synthesis of CdS Nanoparticles Using The Brimstone Suryajaya, Suryajaya; Safitri, Ayu; Suarso, Eka; Haryanti, Ninis Hadi; Manik, Tetti Novalina; Darminto, Darminto
POSITRON Vol 14, No 2 (2024): Vol. 14 No. 2 Edition
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam, Univetsitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/positron.v14i2.77273

Abstract

This paper explains and demonstrates how to synthesize Cadmium Sulphide (CdS) nanoparticles (NPs) using brimstone. The brimstone is obtained from Ijen volcanic crater in East Java Indonesia and used as the source of sulfur gas (S2) instead of Na2S. The brimstone was crushed and dissolved in potassium hydroxide (KOH) solution while heated. Acetic acid (CH3COOH) was added, to release the S2 gas. The liquid-gas method was used to prepare the CdS colloid solution. In this study, the effect of variations in the concentration and volume of CH3COOH, temperature variation, and exposure time on the synthesis of colloidal solutions of CdS NPs will be investigated. The absorption edge of the CdS colloidal solution compared to the bulk material experienced a blue shift. This is the evidence of the formation of NPs in solution. It is confirmed by FTIR which shows a CdS absorption peak at 467 cm-1. The radius of CdS NPs was calculated using the Efros equation to obtain a result of approximately 2 nm. Particle size analyzer (PSA) provides a much larger particle size of 20.8 nm. It is assumed that the NPs were agglomerated. Several treatments given, such as varying the volume of CH3COOH, varying temperature, stirring, and varying synthesis time, did not affect the size of the NPs.  The cadmium sulfide produced would be used as photocatalist in water treatment application.
Co-Authors A Ratnawati A Wiyono Abdullah Shahab abdurrouf Abdurrouf Adler Haymans Manurung Agung Suwandaru Agus Wiyono Ahzan, Sukainil Alimuddin Ali Anne Zulfia Arifin, Rizal Bambang Subali Budi Priyanto Cahyoingrat, Suryo E. Cahyono, Yoyok D.A Hewajuli Dadan Hamdani, Dadan Daniels, Peter Daniels, Peter Dedi Supriadi Dharmayanti, N.L P.I. Dharmayanti, N.L P.I. Dharmayanti, NLP Dharmayanti, NLP Eddy S Siradj Eko Handoyo Endang Siti Astuti Endhah Purwandari Fahmi Astuti, Fahmi Fatimah Karunia Sultera Field, Hume Field, Hume Firdaus, Aulia Anisa Gatut Yudoyono H Hamid Hartawan, R. Hartawan, R. Helmy Hamid Hesti Irnanta Hewajuli, D.A. Hewajuli, D.A. I Wayan T. Wibawan Ida Ayu Putu Sri Widnyani Ida Widaningrum, Ida Indra Sidharta Indrawati Sendow Intifadhah, Sahara Hamas Iwan Dini Iwan Yahya Jagoda Ignjatovic Johari, Norhasnidawani Joni Dwi Pribadi Kholis Nurhanafi Kolif Yulianto L Parede Lee, Vannajan Sanghiran Lintang Edityastono Manik, Tetti Novalina Martin Malole Mashuri Mashuri Morrissy, Chris Morrissy, Chris Muhammad Taqiyuddin Muhammad Zainuri Muharam Saepulloh Munir, Rahmawati Muzakki, Fikrun Najib N. Suryana N.L.P Indi Dharmayanti N.L.P.I Dhamaryanti N.L.P.I Dharmayanti N.L.P.I. Dharmayanti Ninis Hadi Haryanti, Ninis Hadi NLP Indi Dharmayanti Nugroho, Ferry Anggoro Ardy Nuni Widiarti Nurma Sari, Nurma Nurshabrina, Atiqa Taqiyya P Ronohardjo Prayogi, Saiful Prayogi, Soni Puspita, Niniek Fajar R Damayanti R Indriani R M A Adjid R. Indriani R.M Abdul Adjid R.M. Abdul Adjid R.M.A. Adjid Ratnawati, A. Ratnawati, A. Retno Asih, Retno RISA INDRIANI Risa Indryani Risdiana, Risdiana Rizoputra, Ivan Rizqy Wahyu Septiono S Hardjoutomo Saleh, Muh Santoso, Tanto Budi Sembiring, Rinawati Shaliha, Shaliha Shinta Maharani Trivena Sholih, Ahmad Simon Sadok Siregar, Simon Sadok Simson Tarigan Siti Ragil Handayani Sjamsul Bahri SRI WARDANI Suarso, Eka Suhadak Suhadak Suminar Pratapa Suryajaya Suryajaya, Suryajaya Susan M Noor Susi Soviana Sutikno Sutikno Syah, Rakhasoni Firman T Sjafriati T Syafriati Taher Al habsji Tatty Syafriati Totok Wianto Upik Kesumawati Hadi W. Asmara W. T. Artama, W. T. Wahyudi, Sriati Winardi, Yoyok Zainul Arifin Zainuri, M Zulkarnain, Zulkarnain