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Jurnal Sains Materi Indonesia

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Published by Badan Tenaga Nuklir Nasional

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Core Subject : Science,

Materials Science & Nanotechnology

Jurnal Sains Materi Indonesia (Indonesian Journal of Materials Science), diterbitkan oleh Pusat Teknologi Bahan Industri Nuklir - BATAN. Terbit pertama kali: Oktober 1999, frekuensi terbit: empat bulanan.

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Articles 8 Documents

Search results for , issue "Vol 16, No 3: APRIL 2015" : 8 Documents clear

MODIFICATION OF MIXED STRUCTURE TiO2 NANOPOROUS-NANOTUBE ARRAYS WITH CdS NANO PARTICLE AND THEIR PHOTO ELECTRO CHEMICALPROPERTIES Hedi Surahman; Supriyono Supriyono; Yuni K Krisnandi; Jarnuzi Gunlazuardi
Jurnal Sains Materi Indonesia Vol 16, No 3: APRIL 2015
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

MODIFICATION OF MIXED STRUCTURE TiO2 NANOPOROUS-NANOTUBE ARRAYS WITH CdS NANO PARTICLE AND THEIR PHOTO ELECTRO CHEMICALPROPERTIES. In thiswork, a mixed structure TiO2 with a top nanoporous layer and an underneath highly ordered nanotube arrays layer (TNPs-NTAs) were prepared by anodic oxidation of Ti foil under controlled anodization time in an electrolyte containing fluoride ion,water and ethylene glycol. CdS nanoparticles (NPs) was deposited onto the mixed structure of TiO2 by Successive Ionic Layer Adsorption and Reaction (SILAR) with an aim toward tuning the photoelectrochemical performance to visible region. Themorphology, elemental composition, crystal structure, optical properties and photoelectrochemical performance of TNPs-NTs and CdS modified (CdS/TNP-NTAs) samples were characterized by Field Emisi Scanning Electron Microscope (FESEM), Electron Dispersive Spectroscopy (EDS), X-Ray Diffractometer (XRD), Diffuse Reflactance Spectroscopy (DRS) and electrochemical working station respectively. The results indicate that CdS nanoparticles uniformly decorated on top of surface and inner wall of TNPs-NTs sample. No clogging of CdS-NP at the mouth TNPs-NTAs was observed. The CdS/TNP-NTs show an increasing in the visible light adsorption and photocurrent response. Under white light illumination (9.93 mW/cm2), we found that the CdS/TNPs-NTAs have an optimum photocurrent density of 1.16 mA/cm2 , corresponding to energy photoconversion efficiency of 9.75%, which is 7 times higher than that of the bare TiO2 (TNPs-NTAs). The increase of photocurrent is attributed to the enhancement of charge separation efficiency and improved electron transport.

ENHANCEMENT OF GIANT MAGNETORESISTANCE IN Fe2O3-MWCNT/PVA NANoCOMPOSITE FILM S. Purwanto; Wisnu Ari Adi; Salim Mustofa
Jurnal Sains Materi Indonesia Vol 16, No 3: APRIL 2015
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

ENHANCEMENT OF GIANT MAGNETORESISTANCE IN Fe2O3-MWCNT/PVA NANoCOMPOSITE FILM. Synthesis and magnetic properties characterization of Fe2O3-MWCNT/PVA nano Composite film were carried out. Fe2O3-MWCNT as a filler of nano Composite thin film were synthesized using simple mixing methods froma solution containing FeCl3, and Multi-Walled Carbon Nanotube (MWNT). The solution was sonicated for almost 20 minutes then dried at 450 oC for one hour. The mixture of the two composition was dispersed with Sodium Dodecyl Sulfate (SDS) in 20 mL aquabidest and homogenized by ultrasonicator for 15 minutes at 40 oC. Then filler was then mixed with Polyvinyl Alcohol (PVA) with some various concentration and dried overnight at room temperature. X-Ray Diffraction (XRD) analysis and Raman Spectroscopy were used to find out the presence of Fe2O3 phase in as prepared sample. Iron oxide phase partially filled in the wall of MWCNT observed by Transmission Electron Microscope (TEM). The Giant Magnetoresistance (GMR) properties were investigated. The maximum GMR value was negative 80% of the composition 1:9 filler/matrix volume ratio. The linear negative of the magnetoresistance (MR) ratio is coincident with a model as proposed by Nguyen, Spivak and Shklovskii (NSS) and related to the effect of quantum interference between Fe2O3-MWCNT in PVA matrix.

ANALISIS PENGARUH MECHANICAL MILLING MENGGUNAKAN PLANETARY BALL MILLING TERHADAP STRUKTUR KRISTAL DAN STRUKTUR MIKRO SENYAWA LiBOB Etty Marti Wigayati; Raden Ibrahim Purawiardi
Jurnal Sains Materi Indonesia Vol 16, No 3: APRIL 2015
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

ANALISIS PENGARUH MECHANICAL MILLING MENGGUNAKAN PLANETARY BALL MILLING TERHADAP STRUKTUR KRISTAL DAN STRUKTUR MIKRO SENYAWA LiBOB. Telah dilakukan pembuatan senyawa Lithium bis Oksalat Borat (LiBOB) dari bahan baku LiOH, asam oksalat dan asam borat dengan metode reaksi padat padat. Serbuk yang dihasilkan dilanjutkan penghalusan menggunakan planetary ball milling dengan durasi milling di buat bervariasi (4 jam, 5 jam, 6 jam, 10 jamdan 13 jam). Serbuk LiBOB yang dihasilkan dianalisis menggunakan X-Ray Diffractometer (XRD) untuk mengetahui fasa yang terbentuk, struktur kristal dan ukuran kritalitnya. Hasil identifikasi senyawa LiBOB dengan XRD berupa pola difraksi kemudian dianalisismenunjukkan terbentuknya 2 fasa yaitu fasa LiB(C2O4)2 dan fasa LiB(C2O4)2.(H2O) dengan sistem kristal orthorhombic. Kerapatan atom paling kecil pada senyawa LiBOB dengan durasi milling 5 jam dan volum unit sel paling besar pada senyawa LiBOB dengan durasi milling 10 jam. Diameter ukuran kristalit berubah seiring dengan durasi milling, sedang regangan kisi terendah pada durasi milling 4 jam dan tertinggi pada durasi milling 5 jam. Durasi milling 5 jam adalah paling bagus dimana pada fasa ini memberikan ruang paling besar pada tiap unit sel dan regangan kisi paling besar sehingga dapat memudahkan ruang gerak transfer ion Li pada baterai Lithium. Senyawa LiBOB hasil sintesis mempunyai sistem kristal yang teratur. Tingkat keteraturan kristal yang dihasilkan ditunjukan dengan perhitungan indeks kristalinitas yang tinggi.

CRYSTAL STRUCTURE TRANSFORMATION OF Ba-Sr HEXAFERRITE AND ITS EFFECT ON PARTICLE ORIENTATION IN RECYCLE PROCESS Agus Sukarto Wismogroho; Wahyu Bambang Widayatno; Toto Sudiro; Didik Aryanto
Jurnal Sains Materi Indonesia Vol 16, No 3: APRIL 2015
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

CRYSTAL STRUCTURE TRANSFORMATION OF Ba-Sr HEXAFERRITE AND ITS EFFECT ON PARTICLE ORIENTATION IN RECYCLE PROCESS. In general, during its fabrication, 2-5%of total products of Ba-Sr hexaferrite permanent magnet will be rejected.Accordingly, an increase in rejected product of permanent magnet needs to be considered. It is expected that the re-utilization of rejected product can increase the production efficiency in order to achieve zero waste-production. In the present work, the recycling process of Ba-Sr hexaferrite permanent magnet was studied by applying 1 T magnetic field (anisotropic) to align the powder. The rejected products were milled using shaker mill PPF-UG for 10-40 min and then sintered at 1200 ºC for 60 min. The results show that the remanence of original powder was increased by 50% after the particle orientation. However, the recycled sample doesn’t show a significant different. SEM and XRD analysis show the crystalline structure transformation from symmetrical hexagonal to asymmetrical hexagonal structure with crystalline growth in a-b axis direction. This transformation leads to lost in its magneto crystalline anisotropy. Therefore, it was difficult to align the particle.

PENGARUH PENAMBAHAN GARAM-GARAM LITHIUM TERHADAP SIFAT ELEKTROLIT POLIMER BERBASIS KITOSAN. Evi Yulianti; Sudaryanto Sudaryanto; Jadigia Ginting
Jurnal Sains Materi Indonesia Vol 16, No 3: APRIL 2015
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

PENGARUH PENAMBAHAN GARAM-GARAM LITHIUM TERHADAP SIFAT ELEKTROLIT POLIMER BERBASIS KITOSAN. Telah dilakukan penelitian untuk mempelajari pengaruh penambahan berbagai jenis garam lithium terhadap sifat elektrolit polimer berbasis kitosan yang akan diaplikasikan pada baterai lithium isi ulang. Adapun jenis garam lithium yang ditambahkan adalah Li-Asetat, Li-Perklorat, LiPF6 dan Li-Triflat dengan komposisi yang sama. Pembuatan lembaran elektrolit polimer padat dilakukan dengan metode casting dengan penguapan perlahan di dalam oven. Karakterisasi lembaran elektrolit padat dilakukan menggunakan X-Ray Diffractometer (XRD), spektroskopi infra merah (FT-IR), spektrometer impedansi (LCR meter) dan pengukuran bilangan transfer ion. Hasil karakterisasi sinar X menunjukkan bahwa penambahan berbagai jenis garam lithium merusak kristalinitas kitosan. Pengukuran konduktifitas ionik memberikan hasil tertinggi pada penambahan garam Li-Perklorat, yang nilainya masih pada orde yang sama dengan penambahan garamLiPF6 dan Li-Triflat ~ 10-6 S/cm. Konduktivitas juga mengalami kenaikan dengan kenaikan suhu. Energi aktivasi terendah 0,016 eV dan bilangan transfer ion tertinggi ~ 0.5 diperoleh pada penambahan garam LiPF6

EFFECT OF ANNEALING ON Cu-Nb-Sn SUPERCONDUCTING WIRE Agung Imaduddin; Bintoro Siswayanti; Andika Widya Pramono; Pius Sebleku; Hendrik Hendrik; Sigit Dwi Yudanto
Jurnal Sains Materi Indonesia Vol 16, No 3: APRIL 2015
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

EFFECT OF ANNEALING ON Cu-Nb-Sn SUPERCONDUCTING WIRE. The most common application of superconductors is done in the form of superconducting wire. Among the existing types of superconductors, Cu-Nb-Sn superconductors are the most widely used as a wire, producing a high magnetic field. But the critical temperature (TC) values of its superconductors are low enough so that the resulting magnetic field and its application fields are limited. In this study we investigated the effect of annealing treatment on the Cu-Nb-Sn superconducting wire. Note that the process of annealing on superconducting wire can increase the value of the critical temperature of 8K to 16K. The increase is predicted because of the forming of Nb3Sn compounds, and the Nb3Sn compound becomes more stable.Annealing processes were performed at temperatures ranging from 873K to 1173K as well as various annealing time from 32 hours to 120 hours. The superconductivity of the samples were analyzed using resistivity measurement by cryogenic system under low temperature condition. The annealing can be performed optimally at the temperature of 873K for 72 hours when TC reaches 16K. However, the purity of the conductivity properties obtained at the optimal annealing temperature at 723K for 72 hours.

PRODUKSI ENZIM SELULASE OLEH FUNGI SELULOTIK YANG DIRADIASI SINAR GAMMA DALAM FERMENTASI JERAMI PADI T.R.D. Larasati; N. Mulyana; M. Anggriawan; Y. Effendi
Jurnal Sains Materi Indonesia Vol 16, No 3: APRIL 2015
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

PRODUKSI ENZIM SELULASE OLEH FUNGI SELULOTIK YANG DIRADIASI SINAR GAMMA DALAM FERMENTASI JERAMI PADI. Produksi enzim selulase oleh Trichoderma viride dan Aspergillus niger yang dipapari radiasi sinar Gamma dosis rendah telah dilakukan menggunakan substrat jerami padi dengan metode Solid State Fermentation (SSF). Iradiasi sinar gamma dosis rendah berpengaruh terhadap percepatan aktivitas exo-enzim oleh mikroba. Strain Trichoderma viride dan Aspergillus niger dipapari radiasi sinar Gamma dengan dosis rendah : 0 Gy, 50 Gy, 150 Gy, 250 Gy dan 350 Gy. Parameter proses SSF yang berkaitan dengan dekomposisi enzimatis adalah total fungi, nilai pH, aktifitas enzimselulase, kadar glukosa, dan protein kasar diamati selama 16 hari. Hasil penelitian menunjukkan adanya pengaruh iradiasi sinar gamma dosis rendah dan waktu fermentasi terhadap kemampuan enzimatik dengan nilai dosis yang berbeda antar strain. Aspergillus niger memiliki dosis iradiasi terbaik 350 Gy dengan peningkatan produksi enzim selulase sebesar 15,23 U/g Bk, kadar glukosa sebesar 6,25 mg/mL dan kadar protein kasar sebesar 10,1 %. Sedangkan Trichoderma viride memiliki dosis iradiasi optimal 150 Gy dengan peningkatan produksi enzim selulase sebesar 13,23 U/g Bk, dengan kadar glukosa sebesar 5,61 mg/mL dan kadar protein kasar sebesar 9,63% pada waktu fermentasi terbaik 8 hari.

PHOTOCURRENT ENHANCEMENT OF CdS QUANTUM DOT SENSITIZED TiO2 ELECTRODE IN THE PRESENCE OF GOLD NANO PARTICLES Supriyono Supriyono; Hedi Surahman; Yuni Krisyuningsih Krisnandi; Jarnuzi Gunlazuardi
Jurnal Sains Materi Indonesia Vol 16, No 3: APRIL 2015
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

PHOTOCURRENT ENHANCEMENT OF CdS QUANTUM DOT SENSITIZED TiO2 ELECTRODE IN THE PRESENCE OF GOLD NANO PARTICLES. Photo current enhancement of CdS Quantum Dot (CdS-QD) sensitized TiO2 electrode in the presence of gold nano particles had been investigated. CdS quantum dots were prepared by successive ionic layer adsorption and reaction (SILAR) method, in which solution containing Cd(CH3COO)2 and Na2S were used as a precursor. Where as, gold nano particles was synthesized using solution containing HAuCl4 as a precursor, NaBH4 as a reducing agent and polyvinyl pyrrolydone (PVP) as a stabilizer. The film of CdS quantum dots and Au nano particles were characterized by UV-Vis spectrophotometer, Scanning Electron Microscope (SEM), X-Ray Diffraction (XRD), and electro chemical working station. Photo electrochemical study revealed that CdS-sensitized TiO2 electrode with gold nanoparticles have been able to increase photocurrent of 54 A/cm2 to 68 A/cm2, so the photocurrent enhancement of approximately 25% was observed. This observation indicates that the gold nanoparticles is potentially applicable to enhance photocurrent in a CdS-QD sensitized TiO2 electrode, which may lead to the development of more efficient solar cell.

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