Deni Shidqi Khaerudini
Pusat Penelitian Fisika - LIPI,

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Efek Aditif 3Al2O3.2SiO2 dan Suhu Sintering terhadap Karakteristik Keramik -Al2O3 Sebayang, Perdamean; Tetuko, Anggito Pringgo; Khaerudini, Deni Shidqi; Muljadi, Muljadi; Ginting, Masno
Jurnal Fisika dan Aplikasinya Vol 3, No 2 (2007)
Publisher : Jurnal Fisika dan Aplikasinya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (640.543 KB) | DOI: 10.12962/j24604682.v3i2.977

Abstract

Telah dilbuat keramik corundum (-Al2O3) menggunakan serbuk Al2O3 dan masing-masing ditambah: 10, 15, 20 dan 25% (berat) 3Al2O3.2SiO2, digiling 24 jam, lolos ayakan 200 mesh, dikeringkan 110C, dicetak 50 Mpa, dan disintering pada suhu: 1300, 1400, 1500 dan 1600C. Sebesar 20% aditif 3Al2O3.2SiO2 dan suhu sintering 1600C merupakan kondisi optimum, menghasilkan: densitas = 3,47 g/cm3, porositas = 0,64%, kekerasan (Hv) = 1454 kgf/mm2, kuat patah = 313 MPa, dan koesien ekspansi termal = 6,3 x 10−6 C−1.Corundum (-Al2O3) merupakan fasa dominan, partikelnya bulat, grain size: 0,3-0,8 μm dan minornya adalah mullite (Al2O3.2SiO2), berbentuk jarum, dan grain size: 0,3-3,0 μm.
Pengaruh Variasi Sludge-serbuk Kayu sebagai Penguat terhadap Sifat Mekanik Material Komposit Matriks Urea-Formaldehida Khaerudini, Deni Shidqi; Muljadi, Muljadi
Jurnal Fisika dan Aplikasinya Vol 3, No 1 (2007)
Publisher : Jurnal Fisika dan Aplikasinya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (464.593 KB) | DOI: 10.12962/j24604682.v3i1.968

Abstract

Material komposit papan partikel dibuat dari penguat berbasis lignoselulosa dan matriks resin ureaformaldehida. Pembuatan dilakukan dengan mencampur sludge, partikel kayu, dan matriks. Variabel komposisi berat kedua jenis penguat (sludge-partikel kayu), yaitu: 60:40, 70:30, dan 80:20, untuk komposisi matriks yaitu 8%, 10%, dan 12% berat komposit. Setelah komposisi dicampur target kerapatan adalah 0,6 g/cm3. Pembuatan dilakukan dengan metode mat-forming dengan ukuran cetakan 30 cm x 30 cm. Kemudian dilakukan Hot-Press 15 kgf/cm2, suhu 150C, selama 15-25 menit. Selanjutnya komposit diuji mekanik berupa uji elastisitas dan kuat patah mengacu standar JIS.A.5908-94 dan JIS.A.5905-94. Nilai densitas 0,56-0,70 g/cm3, elastisitas 6213-12978 kgf/cm2, dan kuat patah 52-108 kgf/cm2.
PENGARUH PENAMBAHAN IRON MILL-SCALE DAN TEMBAGA SEBAGAI MATERIAL PELAT BIPOLAR Ulmiah, Nisya; Arsyad, Fitri Suryani; Khaerudini, Deni Shidqi
Jurnal Teknosains Vol 7, No 2 (2018): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (462.887 KB) | DOI: 10.22146/teknosains.36576

Abstract

Bipolar plate is an important component of proton exchange membrane fuel cell (PEMFC), which provides fuel and oxidant to reactive sites, collect produced current, and mechanical support for the cell in the stacks. This study concerns to find the optimum composition and sintering temperature of iron mills-cale in matrix aluminium as bipolar plate material. This work firstly carried out by downsizing aluminium flake from scrap into powder using high energy milling for 120 min and treated the iron mill-scale at 300 and 1000 oC for 60 min. The waste aluminium powder, after sieving of 150 mesh, was mixing with iron mill-scale containing 30 to 50 vol.% using shaker mill for 10 min. The mixed powders were then pressed 300 MPa and sintered with temperature of 500-600 oC for 60 min and flowed with N2 gas. The structural changes, physical, and mechanical properties of the sintered sample were studied by optical micrograph, density, porosity, hardness Vickers, and electrical conductivity test. The result showed that the optimum composition Fe is 40 vol. % and sinter temperature is 550 oC. Conductivity value of 45.406 S/cm and hardness 183.96 HV hasn’t meet expectation. Cu added containing 4-10 vol. % Fe aims to improve physical properties composites as bipolar plate material PEMFC. The result showed Cu 4 vol. % Fe can increase conductivity value 64.481 S/cm and hardness 340.13 HV.
Inovasi dan Optimasi Metode Pirolisis Material Karbon berbasis Serat Bulu Ayam untuk Aplikasi Material Penyimpan Hidrogen Khaerudini, Deni Shidqi
Jurnal Teknik Mesin Vol 7, No 3 (2018)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/jtm.v7i3.5002

Abstract

Pembuatan material karbon dari limbah serat bulu ayam telah dilakukan untuk mengkaji optimasi metode pirolisis dengan variasi waktu tahan dan temperatur terhadap struktur, luas permukaan, pori, dan morfologi. Inovasi metode pirolisis two-step yang digunakan yaitu untuk mencapai proses karbonisasi optimal berbasis serat bulu ayam. Metode pirolisis dengan variasi two step berdurasi lama, yaitu step one pada temperatur 215 oC selama 15 jam dan dilanjutkan step two dengan variasi pada temperatur 400, 425, dan 450 oC dengan masing-masing variasi waktu tahan selama 1 dan 0,5 jam. Variasi selanjutnya, inovasi metode pirolisis two-step dilakukan dengan kondisi waktu tahan berdurasi singkat, yaitu: step one pada temperatur 200 oC selama 1 jam dan step two pada temperatur 400 oC selama 1 dan 0,5 jam. Laju pemanasan dan pendinginan yang digunakan yaitu 3 oC/menit. Berdasarkan hasil uji true density, nilai densitas semakin kecil pada waktu tahan yang lama dan temperatur karbonisasi terendah. Hasil pengamatan Field Emission Scanning Electron Microscopy (FESEM) menunjukkan bahwa morfologi permukaan karbon dengan nilai densitas terkecil telah terbentuk pori. Hasil uji Brunnaeur-Emmet-Teller (BET) menunjukkan bahwa pori dan luas permukaan tertinggi terbentuk pada karbon dengan densitas terkecil. Berdasarkan hasil pengujian difraksi sinar-X (XRD), menunjukkan struktur karbon berupa semikristalin.
DISPERSIBILITY OF MULTIWALL CARBON NANOTUBE IN A POLYANIONIC SURFACTANT BASED ON UV-VIS ANALYSIS Irmawati, Yuyun; Khaerudini, Deni Shidqi; Indriyati, Indriyati; Mardiyati, Mardiyati; Yudianti, Rike
Indonesian Journal of Chemistry ARTICLE IN PRESS
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.45567

Abstract

The degree of carbon nanotube (CNT) dispersion in an ink solution plays a critical role in the performance of CNT based devices. This is a challenging task in the CNT utilization due to strong van der Waals interaction affecting the CNT bundles. A good dispersion degree can be achieved, for instance, by lowering the van der Waals interaction with the strategy of non-covalent interaction between polyanionic surfactant and the CNT surface. Herein, a simple and quick technique to disperse multiwall CNT (MWCNT) by using a polyanionic dispersant, carboxymethyl cellulose (CMC), is reported. The dispersion degree of MWCNT in aqueous solution during the sonication process was studied using UV-Vis analysis. Transmission electron microscope (TEM) was also applied to further investigate the interaction between CMC and MWCNT. The result shows that the maximum dispersion of MWCNT was achieved with a maximum absorbance in the UV-Vis spectra. Higher CMC concentration resulted in a higher viscosity of the solution, thus it increased the sonication duration in obtaining the maximum dispersion. By varying the MWCNT concentration at a constant CMC concentration of 0.25 wt.%, a homogenous MWCNT dispersion was obtained up to 0.2 wt.%. The encapsulation of a thin CMC layer on the MWCNT surface with a thickness of 1.5?3 nm was evidenced by TEM micrograph analysis.