Articles
<![CDATA[PEMBUATAN KOMPOSIT CARBON NANOTUBE-POLYVINYL ALCOHOL (CNT-PVA) SERTA EVALUASI SIFAT MEKANIKNYA ]]>
<![CDATA[Wahyudi, Tatang]]>;
<![CDATA[Setyaningsih, Metri]]>;
<![CDATA[Subagio, Agus]]>;
<![CDATA[Widiyandari, Hendri]]>;
<![CDATA[Pardoyo, Pardoyo]]>;
<![CDATA[Ahyani, Musni]]>
<![CDATA[ Arena Tekstil Vol 27, No 1 (2012) ]]>
Publisher : <![CDATA[Arena Tekstil ]]>
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<![CDATA[Perkembangan teknologi nanomaterial mendukung teknologi komposit. Komposit yang menggunakannanomaterial menghasilkan sifat mekanik yang lebih baik daripada komposit biasa. Komposit carbon nanotubes(CNT) berpotensi memiliki kekuatan tarik yang tinggi oleh adanya struktur tabung nanonya yang baik sebagaimatrik. Komposit CNT-PVA telah dibuat dengan metode pelarutan. Polyvinyl alcohol (PVA) dilarutkan dalam airbertemperatur 80°C, selanjutnya material CNT ditambahkan ke dalam larutan tersebut dengan variasi fraksi massaCNT terhadap PVA sebesar 10%, 20% dan 30%. Komposit CNT-PVA terbentuk setelah dikeringkan padatemperatur 80°C. Selanjutnya sifat mekanik komposit dikarakterisasi dengan uji kekuatan tarik. Hasil ujimenunjukkan bahwa komposit CNT-PVA dengan fraksi massa 20% CNT terhadap PVA menghasilkan modulusYoung yang paling besar yaitu 137,71MPa. Ketebalan komposit 0,94 mm yang dibangun oleh tiga lapis tipiskomposit CNT-PVA menghasilkan peningkatan modulus Young hingga 107,30%.]]>
<![CDATA[STUDI PENGARUH UKURAN PIXEL IMAGING PLATE TERHADAP KUALITAS CITRA RADIOGRAF ]]>
<![CDATA[Sudin, Ahmas]]>;
<![CDATA[Muhlisin, Zaenul]]>;
<![CDATA[Widiyandari, Hendri]]>
<![CDATA[ BERKALA FISIKA 2015: Berkala Fisika Vol. 18 No. 3 Tahun 2015 ]]>
Publisher : <![CDATA[BERKALA FISIKA ]]>
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<![CDATA[This study aims is to determine the image on imaging plate which has a different pixel sizes. In this research, the X-ray apparatus and Computed Radiography (CR) which is used in the diagnostic field was used. The three imaging plate each having size of 0.097 mm, 0.115 mm and 0.168 mm with stepwedge objects on it was used. The exposure factor was adjusted at 64.5 kV and 16 mAs. The each of imaging plate were exposure three times. The results of each radiograph imaging plate were measured by using a densitometer. By measuring the Stepwedge radiograph, it was obtained the density and contrast value of each imaging plate. Contrast value for each imaging plate were compared to obtain the imaging plate that have a higher contrast value. This research resulted that each different pixel sizes on the imaging plate would generate a different image quality. Keywords: pixel, imaging plate, image quality, contras, density]]>
<![CDATA[Degradasi Pewarna Methylene Blue (MB) Menggunakan Fotokatalis WO3/Fe2O3 dengan Perbantuan Cahaya Matahari ]]>
<![CDATA[Widiyandari, Hendri]]>;
<![CDATA[Syam, Burhanudin]]>
<![CDATA[ JURNAL SAINS DAN MATEMATIKA Volume 20 Issue 2 Year 2012 ]]>
Publisher : <![CDATA[JURNAL SAINS DAN MATEMATIKA ]]>
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<![CDATA[Degradation of dangerous pollutant with photocatalyst under solar or visible light radiation was a smart solution for environment pollution complication specifically for wastewater. an efficient photocatalyst which works at under wide spectrum from solar radiation. We reported the of tungsten oxide/ferric oxide (WO3/Fe2O3) composite with 6 variant weight ratio Fe additve (0%, 2%, 4%, and 6%).. Methylene blue photodegradation result showed, the decrease intensity of C/C0 concentration more faster and constant especially for 6% additive co-catalyst Fe. Then, the photodegradation sample has result more pure than 5 sample others.  Keywords: WO3/Fe2O3, Photodegradation, photodeposition method, composite material, co-catalyst]]>
<![CDATA[Deposisi Nanopartikel Titanium Dioksida (Tio2) di atas Gelas Transparan Konduktif dan Aplikasinya sebagai Elektroda Kerja pada Sel Surya Berbasis Dye (DSSC) ]]>
<![CDATA[Wahyudi, Bayu]]>;
<![CDATA[Widiyandari, Hendri]]>
<![CDATA[ JURNAL SAINS DAN MATEMATIKA Volume 19 Issue 4 Year 2011 ]]>
Publisher : <![CDATA[JURNAL SAINS DAN MATEMATIKA ]]>
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<![CDATA[Untuk mengantisipasi krisis energi beberapa dekade ke depan ini, sel surya tersensitasi zat pewarna (dye) telah dipertimbangkan sebagai salah satu sumber energi terbarukan yang sangat potensial. Dalam penelitian ini, telah berhasil dibuat elektroda aktif dari nanopartikel TiO2 yang dideposisikan diatas gelas transparan konduktif TCO dengan metode Doctor blade. Nanopartikel TiO2 yang telah dideposisikan kemudian dikarakterisasi menggunakan SEM (scanning electron microscopy) untuk mengetahui sruktur morfologi permukaan. Performa fotovoltaik dari sel surya DSSC telah diukur berdasarkan nilai voltase sirkuit terbuka (Voc) dan dikorelasikan terhadap rapat arus sirkuit pendek (Jsc) . Dari hasil pengujian terhadap performa DSSC diperoleh efisiensi maksimum dengan Voc = 0.68 V dan Jsc= 4.34 mA/cm2. Kata kunci: DSSC, nanopartikel TiO2, metode Doctor blade, fotovoltaik, efisiensi konversi]]>
<![CDATA[Pembuatan dan Karakterisasi Komposit CNT/PVA ]]>
<![CDATA[Setyaningsih, Metri]]>;
<![CDATA[Widiyandari, Hendri]]>;
<![CDATA[Subagio, Agus]]>
<![CDATA[ JURNAL SAINS DAN MATEMATIKA Volume 21 Issue 3 Year 2013 ]]>
Publisher : <![CDATA[JURNAL SAINS DAN MATEMATIKA ]]>
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<![CDATA[Komposit CNT/PVA telah dibuat dengan metode solution processing. Polyvinyl alcohol (PVA) dilarutkan dalam akuades bertemperatur 80°C, dan kemudian carbon nanotubes (CNT) ditambahkan ke dalam larutan tersebut dengan berbagai variasi rasio fraksi massa CNT/PVA sebesar 10, 20 dan 30%. Komposit CNT/PVA terbentuk setelah dikeringkan dalam oven bertemperatur 90°C. Sifat mekanik komposit CNT/PVA dikarakterisasi dengan uji tarik. Komposit CNT/PVA yang memberikan sifat mekanik terbaik selanjutnya digunakan sebagai acuan dalam pembuatan komposit dengan variasi ketebalan. Komposit dengan variasi ketebalan dibuat dengan 3 metode yaitu cetak tebal, cetak lapis tebal dan cetak lapis tipis. Analisis dari uji tarik menunjukkan bahwa komposit CNT/PVA dengan fraksi massa 20% CNT/PVA menghasilkan modulus Young yang paling besar yaitu 137,710348 MPa. Metode cetak lapis tipis menunjukkan peningkatan yang lebih besar dibandingkan dengan metode cetak tebal, dan cetak lapis tebal. Komposit dengan 3 lapis dan ketebalan 0,94 mm menghasilkan modulus Young sebesar 212,825166 MPa dan peningkatan  modulus Young komposit CNT/PVA terhadap modulus Young dari PVA sampai 107,30%.]]>
<![CDATA[Hydrazine and Urea Fueled-Solution Combustion Method for Bi2O3 Synthesis: Characterization of Physicochemical Properties and Photocatalytic Activity ]]>
<![CDATA[Yayuk Astuti]]>;
<![CDATA[Prisca Putri Elesta]]>;
<![CDATA[Didik Setyo Widodo]]>;
<![CDATA[Hendri Widiyandari]]>;
<![CDATA[Ratna Balgis]]>
<![CDATA[ Bulletin of Chemical Reaction Engineering & Catalysis 2020: BCREC Volume 15 Issue 1 Year 2020 (April 2020) ]]>
Publisher : <![CDATA[Department of Chemical Engineering - Diponegoro University ]]>
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DOI: 10.9767/bcrec.15.1.5483.104-111
<![CDATA[Bismuth oxide synthesis using solution combustion method fuelled by hydrazine and urea has been conducted. This study aims to examine the effect of the applied fuels, urea and hydrazine, on product characteristics and photocatalytic activity in degrading rhodamine B dye. Bismuth oxide synthesis was initiated by dissolving bismuth nitrate pentahydrate (Bi(NO3)3.5H2O) in a nitric acid solvent. Fuel was added and then stirred. The solution formed was heated at 300 ºC for 8 hours. The product obtained was then calcined at 700 ºC for 4 hours. Bismuth oxide synthesized with urea (BO1) and hydrazine (BO2) as fuels both obtained form of yellow powder. The formation of bismuth oxide is indicated by the vibrations of the Bi–O–Bi and Bi–O groups and the crystal structure of a-Bi2O3 in both products. Photocatalytic activity test showed that BO1 has a photocatalyst activity in degrading rhodamine B higher than that of BO2 with constant values of 3.83×10-5 s-1 and 3.43×10-5 s-1, respectively. The high photocatalytic activity can be examined through several factors, such as: band gap values, crystal structure, morphology, and surface area, acquired as a result of the use of different fuels in the synthesis process. Copyright © 2020 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).]]>
<![CDATA[Training of Electric Bike Assembly with Lithium Batteries at SMK Muhammadiyah 6 Karanganyar ]]>
<![CDATA[Tika Paramitha]]>;
<![CDATA[Endah Retno Dyartanti]]>;
<![CDATA[Hendri Widiyandari]]>;
<![CDATA[Arif Jumari]]>;
<![CDATA[Adrian Nur]]>;
<![CDATA[Inayati Inayati]]>;
<![CDATA[Anatta Wahyu Budiman]]>;
<![CDATA[Agus Purwanto]]>
<![CDATA[ Equilibrium Journal of Chemical Engineering Vol 5, No 1 (2021): Volume 5, No 1 July 2021 ]]>
Publisher : <![CDATA[Program studi Teknik Kimia UNS ]]>
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DOI: 10.20961/equilibrium.v5i1.53965
<![CDATA[With the increasing development of the battery and electric vehicle industry, student's and teacher's understanding of lithium batteries and skills in assembling electric bikes are very important in competing for jobs in these fields. Educational activities regarding batteries and training on assembling electric bike are carried out at SMK Muhammadiyah 6 Karanganyar, because there were no facilities that support the learning and teaching process about electric vehicles and batteries. The method used in this training is lecture, discussion and practice method. The material presented was about the technology of making lithium batteries and electric bike components. While practical activities include the stages of converting conventional bikes into electric bikes with energy from lithium batteries. This activity shows that participants can understand batteries and can apply batteries to electric vehicles, especially electric bikes.]]>
<![CDATA[Edukasi Teknologi Produksi dan Aplikasi Baterai Lithium Ion pada Kendaraan Listrik di SMK Muhammadiyah 6 Karanganyar ]]>
<![CDATA[Endah Retno Dyartanti]]>;
<![CDATA[Tika Paramitha]]>;
<![CDATA[Hendri Widiyandari]]>;
<![CDATA[Arif Jumari]]>;
<![CDATA[Adrian Nur]]>;
<![CDATA[Anatta Wahyu Budiman]]>;
<![CDATA[Agus Purwanto]]>
<![CDATA[ Equilibrium Journal of Chemical Engineering Vol 4, No 2 (2020): Volume 4 No 2 December 2020 ]]>
Publisher : <![CDATA[Program studi Teknik Kimia UNS ]]>
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DOI: 10.20961/equilibrium.v4i2.45154
<![CDATA[Abstrak. Kendaraan listrik merupakan kendaraan yang digerakkan dengan motor listrik dan mendapat sumber daya listrik yang tersimpan dalam baterai. Keuntungan penggunaan kendaraan listrik dibandingkan dengan kendaraan konvesional antara lain, efisiensi konversi energi yang tinggi, mengurangi pemakaian bahan bakar minyak sehingga secara langsung dan mengurangi emisi gas buang ke atmosfir. Riset grup matertial maju dan energy storage fokus mengembangkan penelitian tentang produksi baterai dan aplikasinya. Kegiatan pengabdian ini bertujuan untuk mensosialisasikan hasil riset tentang baterai dan aplikasi kendaraan listrik sebagai salah satu cara transfer pengetahuan teknologi untuk pelajar Sekolah Menengah Kejuruan (SMK). Siswa SMK harus dibekali dengan pemahaman mengenai baterai lithium ion dan kendaraan listrik sehingga bisa meningkatkan kompetensi lulusan dan memiliki daya saing di pasar kerja. SMK Muhammadiyah 6 Karanganyar memiliki jurusan Teknik Audio Video, Teknik Komputer Jaringan, Teknik Mesin, Teknik Elektro dan Mekanik Otomotif sehingga kegiatan dan kerjasama ini akan sangat mendukung kegiatan pembelajarn. Kegiatan pengabdian ini merupakan tindak lanjut kerja sama magang siswa yang dilakukan di unit produksi baterai dibawah Pusat Unggulan Iptek (PUI) PT Teknologi Penyimpanan Energi Listrik (University Center of Excellence for Electrical Energy Storage Technology). Dengan terselenggaranya kegiatan pengabdian diharapkan mampu memberikan pengetahuan mengenai hasil riset kampus kepada siswa, sehingga dapat memberikan pemahaman mengenai konsep dasar kendaraan listrik dan menumbuhkan inovasi pada siswa untuk mengembangkan kendaraan listrik. Abstract. Electric vehicles are vehicles that are driven by electric motors from the battery as energy sources. The advantages of electric vehicles related to their high energy conversion include reducing fuel oil consumption and reducing exhaust emissions. The advanced materials and energy storage research group is currently developing researches on battery production and its applications. This educational activity is a part of the Research Group Service Grant (HGR-UNS) which aims to disseminate the results of research on batteries and their application to electric vehicles as a form of advanced technology transfer for Vocational High School (SMK) students. SMK students must be provided with knowledge about lithium-ion batteries (LIB) and electric vehicles so that they can improve their competence and increase their competitiveness in the job market. SMK Muhammadiyah 6 Karanganyar offers several programs so that this educational activity will greatly support students' learning activities. This education activity is also the continuation of interns' activities at the Center for Excellence in Higher Education Science and Technology for Electrical Energy Storage Technology. With this educational activity's implementation, we wish to increase students' knowledge about battery technology and its applications. Keywords: education; Lithium-Ion Battery; Electric Vehicle]]>
<![CDATA[Synthesis of Hard Carbon from Waste Teak Wood Powder as Anode Material for Lithium-ion Batteries ]]>
<![CDATA[Alfi Nur Aini]]>;
<![CDATA[Dewi Ratnasari]]>;
<![CDATA[Aninda Artatriska Meilana]]>;
<![CDATA[Hendri Widiyandari]]>
<![CDATA[ Journal of Physics: Theories and Applications Vol 5, No 2 (2021): Journal of Physics: Theories and Applications ]]>
Publisher : <![CDATA[Universitas Sebelas Maret ]]>
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DOI: 10.20961/jphystheor-appl.v5i2.59348
<![CDATA[Electrochemical energy storage technologies such as rechargeable batteries show considerable progress due to their high efficiency, flexible power, long life cycle, and low maintenance. Graphite is a common anode material used in lithium-ion batteries. However, there are several shortcomings in graphite anode material, one of which is poor structural stability. Therefore, hard carbon is the most promising candidate for lithium-ion battery anodes due to its high storage capacity, low working potential, and cycle stability. This research utilizes teak sawdust waste as a hard carbon battery anode. They were approached by the carbonization method at temperatures of 350°C and 450°C. In general, X-Ray Diffraction (XRD) results show an amorphous structure of carbon atoms. The morphological structure known through the Scanning Electron Microscopy with Energy Dispersive X-ray (SEM-EDX) test shows a fiber shape. The mass percent of carbon at a temperature of 450°C was higher than at a temperature of 350°C, which was 67.93%. Then the battery performance test was carried out with the highest discharge capacity value obtained at a temperature of 450°C at 191.56 mAh/g. Based on the results of this study, teak sawdust waste material has the potential as an anode for rechargeable batteries and can prevent environmental pollution.]]>
<![CDATA[Synthesis and Characterization of Material LiNi0.8Co0.15Al0.05O2 Using One-Step Co-Precipitation Method for Li-Ion Batteries ]]>
<![CDATA[Cornelius Satria Yudha]]>;
<![CDATA[Luthfi Mufidatul Hasanah]]>;
<![CDATA[Soraya Ulfa Muzayanha]]>;
<![CDATA[Hendri Widiyandari]]>;
<![CDATA[Agus Purwanto]]>
<![CDATA[ JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 4, No 3 (2019): JKPK (Jurnal Kimia dan Pendidikan Kimia) ]]>
Publisher : <![CDATA[Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret ]]>
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DOI: 10.20961/jkpk.v4i3.29850
<![CDATA[Li-ion battery is an energy storage device which could be applied as power source for electronic devices. The capacity of a battery is determined by the cathode material. Over this last decade, high nickel content cathode material is applied for electric vehicular technology. This study aims to synthesize a nickel-rich cathode material, LiNi0.8Co0.15Al0.05O2 (NCA) via one-step co-precipitation and study its characteristics. The Ni, Co and Al metal ion conversion during co-precipitation were analyzed using Atomic Adsorption Spectroscopy (AAS). Based on X-Ray diffraction analysis, NCA sample exhibited hexagonal-layered structure with high crystallinity. Based on Scherrer equation, the mean crystallite diameter of NCA sample is 40 nm. Scanning electron microscope (SEM) showed micron-sized homogenous particles with smooth surface. The final composition of Ni, Co and Al metal were confirmed using XRF. The capacity of the battery was determined using galvanostic test method with voltage range of 2.7-4.25 V using graphite as the counter anode. The initial specific discharge capacity of NCA is 60 mAh/g while the capacity loss per cycle is 1%.]]>
