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All Journal Jurnal Matematika & Sains Journal of Aceh Physics Society INDONESIAN JOURNAL OF APPLIED PHYSICS Jurnal Teori dan Aplikasi Fisika Jurnal Natural Jurnal Pendidikan Sains Indonesia (Indonesian Journal of Science Education)
Adi Rahwanto
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Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemistry Earth & Planetary Sciences Education Energy Immunology & microbiology Materials Science & Nanotechnology Mathematics Neuroscience Physics

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Efektifitas Penggunaan Silika dari Abu Sekam Padi sebagai Katalis pada Material Penyimpan Hidrogen Sistem MgH2 Jalil, Zulkarnain; Pajriana, Elisa; Rahwanto, Adi
Jurnal Matematika dan Sains Vol 22 No 1 (2017)
Publisher : Institut Teknologi Bandung

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Abstract

Magnesium (Mg) and its alloys are among the potential candidates as materials for hydrogen stor-age applications because they have the ability to absorb hydrogen in large quantities. However Mg has a drawback, ie kinetic reaction is quite slow. For that we need an intensive effort to overcome this, one of them is with catalyst insertion. In this paper, we report on the use of silica catalyst (SiO2) from rice husk ash in the MgH2 hydrogen storage material. SiO2 material inserted into MgH2 of 1 wt%, 3wt% and 5wt% using high energy ball milling technique. Results of observations by XRD showed a milling process that lasted for 5 hours successfully reduced to nanokristal scale. The emerging phase, from the XRD observation, is the MgH2 phase as the most dominant phase. Thermal characterization with DSC showed that the addition of SiO2 was able to decrease the desorption time and temperature of 338,720C in 14.75 minutes in 5wt% catalyst variation.
Preparasi Serbuk Nanokristal Fe3O4 dari Pasir Besi Menggunakan Planetary Ball Mill (PBM) Zulkarnain Jalil; Adi Rahwanto
Jurnal Teori dan Aplikasi Fisika Vol 2, No 1 (2014): Jurnal Teori dan Aplikasi Fisika
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v2i1.1251

Abstract

Upaya pemanfaatan mineral magnetite (Fe3O4) yang terdapat di dalam pasir besi sebagai upaya mengembangkan usaha dari sektor non-migas, khususnya pertambangan umum perlu mendapat perhatian khusus. Kandungan oksida besi yang tinggi sangat dibutuhkan untuk berbagai aplikasi dan dunia industri. Dalam paper ini dilaporkan hasil kajian awal tentang karakteristik pasir besi nano-magnetite di kawasan pantai Krueng Raya, Aceh Besar, Propinsi Aceh. Pasir besi berukuran nano telah berhasil dipreparasi dengan teknik mechanical alloying menggunakan ball mill tipe planetary selama 20 jam. Hasil analisa kualitatif dengan difraksi sinar-X diketahui bahwa fasa Fe3O4 merupakan fasa mayoritas dengan jumlah kandungan mencapai 82,93% diikuti fasa minor masing-masing TiO2 (7,26%), SiO2 (3,55%), dan Al2O3 (2,03%). Sementara hasil kalkulasi ukuran kristal dengan metode Scherrer masing-masing pada bidang kristal (311) diperoleh ukuran kristal 76.8 nm, lalu bidang kristal (202) adalah 119,9 nm dan bidang (404) sebesar 17,4 nm.
Identification of Oxide Compound in Dolomite Mineral from Aceh Tamiang Region Nirmala Sari; Zulkarnain Jalil; Adi Rahwanto
Journal of Aceh Physics Society Volume 2 Number 1, March 2013
Publisher : PSI-Aceh

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Abstract

Indonesia has abundant mineral especially carbonate-based mineral, ike dolomite. Particularly in Aceh province's, the largest dolomite deposits is available in Aceh Tamiang district around 1.9 billion tons. Unfortunately, current use of dolomite in the industry and other applications is still limited. In this work we report the advanced preparation of dolomite using calcinations method. Whereas, with this method, the dolomite mineral can be processed into calcium and magnesium oxide which has a very wide field of application and higher values. To obtain optimal results, we also identify the effect of temperature on the formation of oxide compounds. Preliminary study using XRF founded that dolomite in village Selamat is known as the highest concentration of CaO (61.20%) followed by MgO (25.28%). It is also showed that the main phase obtained by XRD is dolomite (CaMg(CO3)2). Furthermore, after the calcinations process at 700 °C, it was founded that the formation of dolomite were CaCO3 and MgO, whereas at temperatures of 900 °C mostly the CaCO3 has decomposed into CaO. SEM observations showed that dolomite has the composition of particles distributed homogeneously along the particle agglomerate when it calcinations.
Studies of Relation Between Turbidity and Refractive Indeks of Bottled Water in The Area of Banda Aceh by Using Interferometer Murty Method Nurlaili .; Nasrullah Idris; Adi Rahwanto
Journal of Aceh Physics Society Volume 1 Number 1 March 2012
Publisher : PSI-Aceh

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Abstract

Bottled water is clean water ready to drink quickly without cooking however, it is not all of the bottled water have a good quality. The quality of water can be observed from the optical properties of water, such as clarity and refractive index. A study has been carried out by using interferometer Murty method to know the relation between turbidity and refractive index of the bottled water. The refractive index measurement was carried out for 20 samples from 10 brands of the bottled water. The result of refractive index measurement shows that the refractive index of the water is about 1,1, in averge on the other hand the refractive index of water based on literature is 1,33. Along with the refractive index measurement by using interferometer Murty, turbidity was also measured by using Turbidimeter. The result of measurement show that there is a relation between turbidity and refractive index. The deviation of refractive index values obtained in this measurement from the literature data is because there are some error in the measurement process. By improving the error, better measurement will allow the interferometer Murty to be used to inspect water clarity.
Studi Katalis Ni Nano pada Material Penyimpan Hidrogen MgH2 yang Dipreparasi melalui Teknik Mechanical Alloying Nirmala Sari; Adi Rahwanto; Zulkarnain Jalil
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 6, No 01 (2016): IJAP VOLUME 06 ISSUE 01 YEAR 2016
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v6i01.1788

Abstract

The main obstacle which hinders the application of fuel cell fuels in motor vehicles today is the hydrogen storage tubes. One of the latest efforts in hydrogen storage research is to insert hydrogen in certain metals or called solid state hydrogen storage. Magnesium (Mg) is regarded as one of the material potential candidates absorbing hydrogen, because theoretically, it has the ability to absorb hydrogen in the large quantities of (7.6 wt%). This amount exceeds the minimum limit which is targeted Badan Energi Dunia (IEA), that is equal 5 wt%. However Mg has shortage, namely its kinetic reaction is very slow, it takes time to absorb hydrogen at least 60 minutes with very high operating temperatures (300-400 °C). The aim of this study is to improve the hydrogen desorption temperature hydrogen storage material based MgH2. In this method, milling of material is done in the time of 10 h with the variation of catalyst inserts a for 6wt%, 10wt% and 12 wt%. The results from XRD measurements in mind that the sample was reduced to scale nanocrystal. Phase that appears of the observation of result XRD is MgH2 phase as the main phase, and followed by Ni phase as minor phase. The result of observations with DSC, to the lowest temperature obtained on the sample with a weight of catalyst 12 wt% Ni catalyst that is equal to 376 °C. These results successfully repair pure temperature of Mg-based hydrides.
SYNTHESIS AND CHARACTERIZATION OF HEMATITE (Fe2O3) EXTRACTED FROM IRON ORE BY PRECIPITATION METHOD Andia Andia; Adi Rahwanto; Zulkarnanin Jalil
Jurnal Natural Volume 16, Number 1, March 2016
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (80.678 KB) | DOI: 10.24815/jn.v16i1.4361

Abstract

Indonesia has a lot of mining material of iron ore that could be used for various purposes in the steel industry or for other. This research, has synthesized and characterization of hematite from local iron ore from Lhoong area by precipitation mechanism. The iron ore powder was magnetic separation with magnet then mixed with HCl and NH4OH. Then, it was dried at temperature of 150 ºC and calcinated at 500º C for 2 hours. Characterizations were perfomed using X-ray Diffraction (XRD) and X-ray Fluorescence (XRF). As the results, it was found that the magnetic separation iron ore showed the composition of Fe2O3 (95.99%), SiO2 (2.10%). Then, by precipitation mechanism, the composition of Fe2O3 found around 96.58%. Next, the synthesis result are characterized with XRD show that the main phase is dominan in iron ore of Lhoong is hematit (Fe2O3). Scherrer calculations showed that precipitation mechanism to reducing grain size, the process of magnetic separation (58.009 µm) and the precipitation mechanism (20.950 µm.)
THE EFFECT OF MAGNETITE (Fe3O4)CATALYST FROM IRON SANDS ON DESORPTION TEMPERATURE OF MgH2 HYDROGEN STORAGE MATERIAL Maulinda Maulinda; zulkarnain Jalil; Adi Rahwanto
Jurnal Natural Volume 16, Number 1, March 2016
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (153.14 KB) | DOI: 10.24815/jn.v16i1.4362

Abstract

One of the future technologies for a safe hydrogen storage media is  metal hydrides. Currently, Mg-based metal hydride has a safety factor and efficient for vehicle applications. However, the thermodynamic properties of magnesium hydride (MgH2) found a relatively high temperature. High desorption temperatures caused MgH2 high thermodynamic stability resulting desorption enthalpy is also high. In this study, natural mineral (iron ore) has been extracted from iron sand into powder of magnetite (Fe3O4) and used as a catalyst in an effort to improve the desorption properties of MgH2. Magnetie has been successfully extracted from iron sand using precipitation method with a purity of 85 % , where the purity of the iron sand before extracted was 81%. Then, MgH2-Fe3O4 was milling using mechanical alloying method with a variety of catalysts and milling time. The observation by XRD showed the material was reduced to nanocrystalline scale. MgH2 phase appears as the main phase. DSC test results showed with the addition of Fe3O4, the desorption temperature can be reduced up to 366oC, compared to pure pure MgH2 reached by 409o C. Furthermore, based on gravimetric test, the hydrogen release occurs at a temperature of 388o C, weight loss  of 0.66 mg during 16 minutes.
PENGARUH PENGGUNAAN MEDIA KOMPUTER BERBASIS SIMULASI PHYSICS EDUCATION TECHNOLOGY (PhET) TERHADAP HASIL BELAJAR DAN KETERAMPILAN BERFIKIR KRITIS SISWA PADA MATERI FLUIDA STATIS Syarifah Rita Zahara; Yusrizal Yusrizal; Adi Rahwanto
Jurnal Pendidikan Sains Indonesia Vol 3, No 1 (2015): April 2015
Publisher : Universitas Syiah Kuala

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Abstract

Penelitian ini bertujuan untuk mengetahui peningkatan hasil belajar dan keterampilan berfikir kritis pada pelajaran fisika konsep fluida statis dengan menggunakan media komputer berbasis simulasi PhET dengan pembelajaran konvensional. Metode penelitian yang digunakan adalah metode eksperimen dan desain kontrol group pretes postes. Populasi dalam penelitian ini adalah seluruh siswa kelas XI IPA. Teknik pengambilan sampel dilakukan dengan cara cluster random sampling yang memiliki kemampuan yang sama, tanpa mengacak siswa tiap kelasnya. Pengelompokan sampel terdiri dari dua kelas di sekolah MAN Rukoh Banda Aceh. Teknik pengumpulan data dilakukan dengan menggunakan tes tertulis berupa soal pilihan ganda sebanyak 20 soal pretes dan postes. Hasil uji t menunjukkan Hasil penelitian menunjukkan bahwa terjadinya perbedaan peningkatan hasil belajar dan keterampilan berfikir kritis siswa pada kelas kontrol dan kelas eksperimen. Kelas eksperimen yang menggunakan simulasi PhET mengalami peningkatan hasil belajar dan keterampilan berfikir kritis yang lebih tinggi daripada kelas kontrol yang menggunakan pembelajaran konvensional.
Co-Authors Anak Agung Istri Sri Wiadnyani Andia Andia Maidar Maidar Maulinda Maulinda Nasrullah Idris Nirmala Sari Pajriana, Elisa Syarifah Rita Zahara Yusrizal Yusrizal Zulkarnain Jalil Zulkarnain Jalil Zulkarnain Jalil Zulkarnanin Jalil