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All Journal Jurnal Spektra Science and Technology Indonesia Majalah Ilmiah Pengkajian Industri Jurnal Ilmu Fisika Makara Journal of Science Makara Journal of Technology

Mardiyanto Mardiyanto

Centre for Technology of Industrial Nuclear Materials -BATAN

Author-ID : 315213

Aerospace Engineering Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Electrical & Electronics Engineering Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Transportation

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STUDI AWAL DEPOSISI LAPISAN TIPIS YTTRIA-STABILIZED ZIRCONIA (YSZ) PADA SUBSTRAT BAJA FERITIK DENGAN METODE PLD - PULSED LASER DEPOSITION Agusutrisno, Agusutrisno; Suharyadi, Edi; Mardiyanto, Mardiyanto; Rivai, Abu Khalid
Jurnal Spektra Vol 16, No 1 (2015): Spektra: Jurnal Fisika dan Aplikasinya
Publisher : Jurnal Spektra

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AbstrakStudi awal lapisan tipis Yttria-Stabilized Zirconia (YSZ) telah berhasil dideposisi di atas substrat baja feritik dengan teknik Pulsed Laser Deposition (PLD) di fasilitas laboratorium Pusat Sains dan Teknologi Bahan Maju - BATAN. Lapisan tipis ini dideposisi dengan tekanan chamber dalam rentang 200 mTorr hingga 225 mTorr dengan temperatur substrat pada temperatur ruang serta pulsa tembakan laser adalah 30Ã1000 tembakan dengan frekuensi 10 Hz. Selanjutnya sampel yang diperoleh dianalisis dengan Optical Microscope (OM), X-Ray Diffractometer (XRD), Raman Spectrometer dan Atomic Force Microscope (AFM). Sebagai bahan perbandingan sampel tersebut dipanaskan (annealing) pada temperatur 800oC kemudian dikarakterisasi dengan metode yang sama. Hasil analisis secara visual maupun dengan OM serta AFM menunjukkan bahwa lapisan YSZ telah terdeposisi di atas permukaan substrat baik sebelum dipanaskan maupun setelah dipanaskan. Karakterisasi struktur kristal sampel menggunakan X-ray Diffraction (XRD) menunjukkan bahwa derajat kristalinitas lapisan tipis YSZ masih rendah baik dengan substrat dipanaskan maupun tanpa dipanaskan. Karakterisasi Raman Spectroscopy menunjukkan bahwa pada deposisi dengan temperatur ruang belum tampak dengan jelas ikatan dan fasa YSZ. Sedangkan pada sampel dengan substrat dipanaskan menghasilkan puncak pada 550 cm-1 yang menunjukkan bahwa lapisan cenderung amorf. Karakterisasi topografi permukaaan menggunakan AFM menunjukkan bahwa sampel yang dideposisi menggunakan teknik PLD menghasilkan surface roughness yang sangat halus dalam rentang nano-meter sehingga berpotensi digunakan sebagai aplikasi Thermal Barrier Coating (TBC) pada material temperatur tinggi.Kata kunci: Lapisan tipis, Yttria-Stabilized Zirconia (YSZ), Pulsed Laser deposition (PLD), baja, nano-meterÂ AbstractPRELIMINARY STUDY OF A YTTRIA-STABILIZED ZIRCONIA (YSZ) THIN FILM DEPOSITION ON A FERRITIC STEEL SUBSTRATE USING PLD - PULSED LASER DEPOSITION METHOD. A thin film of Ytrria-Stabilized Zirconia has been deposited on a ferritic stainless steel by Pulsed Laser Deposition (PLD) at laboratory facilities of Center For Science and Technology of Advanced Materials-BATAN. The thin film was deposited with the chamber pressure range of 200 mTorr to 225 mTorr, substrate temperature at room temperature, and 30x1000 shots of pulsed-laser with 10 Hz of frequency. Afterward, the sample was analyzed using Optical Microscope (OM), X-Ray Diffractometer (XRD), Raman Spectrometer and Atomic Force Microscope (AFM). As for comparison analysis, the sample was annealed at 800oC then characterized using the same methods. The result of analyses with visually and using OM then AFM showed that the thin film of YSZ was deposited on the surface of the substrate. The characterization of the crystal structure of the sample by using XRD showed that the crystallinity degree of thin film with the substrate both with and without annealing was still low. Raman spectroscopy characterization showed that the bond and phase of YSZ deposition with the substrate at room temperature were not clearly formed. Whereas the sample was annealed resulted peak at 550 cm-1, which is showed that the thin film was still amorphous. Surface topography characterization using AFM showed that the surface roughness of the sample deposited by PLD method was relatively smooth in the range of nano-meter.Keywords: Thin film, Yttria-Stabilized Zirconia (YSZ), Pulsed Laser Deposition (PLD), steel, nano-me

Pengaruh Penggunaan Teknik Blending Dan Kompaksi Terhadap Morfologi Komposit Polimer UHMWPE-Na2B4O7.5H2O Sebagai Bahan Perisai Radiasi Neutron Termal Bery, Winda Surya; Fitriyani, Dian; Elvaswer, Elvaswer; Zavianti, Enny; Mardiyanto, Mardiyanto; Rivai, Abu Khalid; Sukaryo, Sulistioso Giat
Jurnal Ilmu Fisika Vol 8, No 2 (2016): JURNAL ILMU FISIKA
Publisher : Jurnal Ilmu Fisika

Telah dilakukan pembuatan dan karakterisasi komposit polimer UHMWPE dengan filler Na2B4O7.5H2O sebagai bahan perisai radiasi neutron termal. Pembuatan bahan dilakukan dengan menggabungkan UHMWPE dan Na2B4O7.5H2O menggunakan metode blending untuk menghasilkan komposit yang homogen, dan proses kompaksi untuk meminimalkan jarak antar partikel penyusun bahan. Persentase penambahan Na2B4O7.5H2O yang digunakan bervariasi dari 0% hingga 52%. Bahan dasar dan filler di-blending pada suhu 165°C selama 15 menit, selanjutnya dikompaksi dengan pembebanan 10 ton. Hasil analisis EDS menunjukkan persentase massa filler di permukaan bahan meningkat dengan penambahan Na2B4O7.5H2O hingga konsentrasi 40% dan menurun di 52%. Hasil karakterisasi SEM menunjukkan persentase filler optimum pada 40%. Dengan demikian metode blending dan kompaksi sesuai digunakan untuk mencampurkan UHMWPE dan Na2B4O7.5H2O menjadi bahan perisai neutron termal dengan perbandingan komposisi (60:40)%. Kata kunci : Perisai radiasi, neutron termal, UHMWPE, Na2B4O7.5H2O, filler, blending, kompaksi

Karakterisasi Bahan Perisai Radiasi Neutron Ultra High Molecular Weight Polyethyene Dengan Filler Gd2O3 Menggunakan Teknik Radiografi Neutron Zarvianti, Enny; Fitriyani, Dian; Elvaswer, Elvaswer; Bery, Winda Surya; Rivai, Abu Khalid; Mardiyanto, Mardiyanto; G.S, Sulistioso
Jurnal Ilmu Fisika Vol 9, No 1 (2017): Published in March 2017
Publisher : Universitas Andalas

Radiasi merupakan pancaran energi melalui suatu materi atau ruang dalam bentuk energi, panas, partikel atau gelombang yang dapat diserap oleh bahan lain. Beberapa radiasi dapat mengionisasi bahan yang dilaluinya salah satunya radiasi neutron karena memiliki daya tembus yang tinggi sehingga sangat diperlukan perisai radiasi. Adapun kriteria dari perisai radiasi neutron harus memiliki kandungan hidrogen yang tinggi, memiliki nilai tampang lintang yang baik dan tidak bersifat korosi. Bahan UHMWPE (Ultra High Molecular Weight Polyethyene) memiliki kandungan hidrogen yang tinggi dan tidak mudah korosi dan bahan Gadolinium oxide (Gd2O3) sangat baik menyerap neutron karena mempunyai tampang lintang serapan neutron yang tinggi. Berdasarkan hal tersebut maka dibuat komposit UHMWPE-Gd2O3 dengan tujuan dapat meningkatkan nilai serapan neutron sehingga dalam aplikasinya bisa lebih efektif untuk memperlambat bahkan menahan radiasi neutron. Telah dilakukan karakterisasi bahan perisai radiasi neutron yang dibuat sendiri dengan teknik radiografi neutron. Bahan perisai radiasi dibuat dengan bahan utama UHMWPE dan penambahan filler Gadolinium Oxide (Gd2O3) dengan kompoisisi 70% : 30% massa menggunakan metode blending dan kompaksi. Bahan dibuat dengan ketebalan yang bervariasi dari 0,5 cm hingga 2 cm. Hasil karakterisasi XRD menunjukkan tidak terbentuk senyawa kimia antara kedua bahan dan karakterisasi menggunakan SEM terlihat hasil distribusi unsur yang terkandung dalam filler Gd2O3 merata pada bahan dasar polimer. Pengujian serapan neutron menggunakan teknik radiografi neutron dengan metode film. Dengan penambahan variasi ketebalan meningkatkan daya serap bahan dari 58,78% menjadi 67,89% dan nilai koefisien atenuasi diperoleh sebesar 1,025.Kata kunci: perisai radiasi, UHMWPE,Gd2O3, radiografi neutron, daya serap dan koefisien Â atenuasi.

Physical Interaction Of Chitosan-Alginate Entrapping Extract Of Papaya Leaf And Formation Of Submicron Particles Dosage Form Untari, Budi; Wijaya, Dina Permata; Mardiyanto, Mardiyanto; Herlina, Herlina; Angraeni, Via; Firana, Ario
Science and Technology Indonesia Vol 4 No 3 (2019): July
Publisher : ARTS Publishing

Research on physical interaction of chitosan-alginate entrapping extract of papaya leaf (Carica papaya L) into submicron particles formation has been performed. Preparation of papaya leaf extract into submicron particle dosage form of chitosan and sodium alginate polymer using ionic gelation method aimed to increase the solubility of extract. Submicron particles consisting of papaya leaf extract, chitosan, sodium alginate and CaCl2 were combined using variation of stirrer speed of 500, 750, and 1000 RPM. The optimum formula obtained has a speed of 1000 RPM with the percent EE value of 71.90%. The results of submicron particles characterization such as diameter and particle size distribution (PDI) using particle size analyzer (PSA) tools were 189.2 nm and 0.330. The results of XRD revealed the changes of type of crystalinity form to amorphous on submicron particles. The results of FTIR revealed the physical interaction without shifting of wave number of carbonyl, amine, and hydroxyl group which indicated that there were no chemical interactions occurred. These data indicated that papaya extract can be formulated into submicron particles of chitosan-alginate polymer.

The submicron particles FORMULATION OF IONIC-GELATION SUBMICRON PARTICLES LOADING EXTRACT PAPAYA LEAVES (Carica papaya L.) WITH LACTIC ACID ISOLATES Mardiyanto, Mardiyanto; Untari, Budi; Fithri, Najma Annuria; Sandi, Sofia; Mawaddah, Zahrul
Science and Technology Indonesia Vol 4 No 3 (2019): July
Publisher : ARTS Publishing

A study regarding ionic-gelation submicron particle of papaya leaves (Carica papaya L.) extract with lactic acid of weeds potentially for antidiarrhea has been conducted. Preparation of papaya leaves ethanolic extract and lactic acid isolate into particles was done by ionic gelation method. This study aimed to determine: the major compound of extract, the total quercertine of extract, the percent value of encapsulation efficiency of the optimum formula which was varied by (CaOH)2 of the three formulas, and physical properties of particles. Formula 1 was using (CaOH)2 of 12.5 gram; formula 2 (CaOH)2 of 17,5 gram; formula 3 (CaOH)2 of 22.5 gram. The results showed formula 1 as the optimum formula that has the highest %EE. The average %EE values ??of F1; F2; F3 respectively were 80,82%; 80,41%; 80,31%. The results of particle characterization using the PSA in the optimum formula produced particle size values ??with an average of 253.6 nm, PDI of 0.218, and zeta potential +8 mV respectively.

THE SYNTHESIS OF PBZR0.52TI0.48O3 AND PBZR0.58TI0.42O3 CERAMIC POWDER BY USE MOLTEN SALT METHOD AND ITS INTERMEDIATE PRODUCT ANALYSIS Ahda, Syahfandi; Mardiyanto, Mardiyanto; Taufiq, Agus; Silalahi, Marzuki
Majalah Ilmiah Pengkajian Industri Vol 13, No 3 (2019): Majalah Ilmiah Pengkajian Industri
Publisher : BPPT

Lead zirconat titanate, Pb(Zr1-x,Tix)O3 is a material with high piezoelectric properties and many studies have been carried out in development, in order to improve the materials quality in various applications. Therefore,one of them is the development of synthesis with the molten salt method in this study. Choice of the molten salt method is simply and and not expensive. The salt ratio of NaCl / KCl at 1: 1 in moles as a solvent medium was carried out in synthesizing Pb(Zr1-x,Tix)O3. Likewise, the salt ratio with reactant/basic material was 1: 1 in weight percentages. An intermediate product is obtained if the dynamics of chemical reactions in the diffusion process occur indirectly or in stages. To identify intermediate products in this synthesis process, the sintering temperature has been varied to 575, 675 and 775 oC for samples A, B and C, respectively. The results of these syntheses have been identified and characterized using x-ray diffraction (XRD) methods. The Highscore program using the Rietveld method to identify the intermediate product content and each crystal structure has been applied in the rifenement process on the XRD intensity profile with a statistical error of less than 6%. Intermediate products have been obtained as follows, PbTiO3, PbZrO3 and Zr0.4Ti0.6O3. Whereas sample C has obtained two phases namely PbZr0.52Ti0.48O3 and PbZr0.58Ti0.42O3 with tetragonal (P4mm) and rhombohedral crystal structures (R3c).

Analysis on the Crystal Structure of the Piezoelectric Nanocrystal Ceramic of Pr-doped Bi1/2Na1/2TiO3 using Molten-Salt Synthesis Ahda, Syahfandi; Ambarwati, Vita; Mardiyanto, Mardiyanto; Sukirman, Engkir; Sugeng, Bambang
Makara Journal of Science
Publisher : UI Scholars Hub

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One of the future technologies in nuclear reactors is the ability of piezoelectric materials to monitor reactor cores as sensors. Particularly, Pb-free piezoelectric materials, such as Bi1/2Na1/2TiO3, have been examined to improve the ability of their piezoelectric properties. In this study, we attempted to add Pr6O11 dopant material with mole ratios of 0, 0.3, 0.5, and 0.7 mol%. The synthesis process used in this study is the molten-salt synthesis method with a NaCl and KCl salt mole ratio of 1:1. The crystal structure analysis using the refinement process of the Rietveld method of the HighScore software was performed. Accordingly, a rhombohedral crystal structure system with lattice parameters of 3.8809(2), 3.8831(2), 3.8834(7), and 3.8816(2) angstroms and variations in the content of Pr6O11 was obtained. The optimal lattice parameter was discovered with the addition of 0.5 mol% of Pr6O11. The morphology of the synthesis product is still unclear for each addition of dopant material due to the large number of granular agglomerations.

Nano-Channels Early Formation Investigation on Stainless Steel 316Ti after Immersion in Molten Pb-Bi Rivai, Abu Khalid; Mardiyanto, Mardiyanto; Heinzel, Annette
Makara Journal of Technology Vol. 21, No. 1
Publisher : UI Scholars Hub

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Development of fuel cladding and structural materials in Pb-Bi environment, especially at high temperature, is a critical issue for the deployment of LFR (Lead alloy-cooled Fast Reactor) and ADS (Accelerator Driven Transmutation System). This is because of the corrosive characteristic of Pb-Bi to metals as constituent materials of fuel cladding and structural of the reactors. Corrosion test of a high-chromium austenitic stainless steel i.e. SS316Ti in molten Pb-Bi at 550 ºC has been carried out for about 300 hours continuously. The characterization using SEM-EDS (Scanning Electron Microscopy - Energy Dispersive X-ray Spectroscopy) showed that an iron oxide as the outer layer and a chromium oxide as the inner layer on the surface of the specimen were formed which in general have protected the steel specimen from corrosion and dissolution attack of Pb-Bi. However, small amount of Pb could penetrate into the iron oxide layer through ultra-narrow channels. Atomic Force Microscopy (AFM) with Electrostatic Force Microscopy (EFM) mode was employed to investigate the phenomena of the nano-channels early formation. The results of the nano-scale investigation showed clearly the formation of the channels at the early time of corrosion as the way of Pb to penetrate into iron oxide outer layer.

Effects of Plasma Sintering on the Post TIG Weld Joint of Fe-15Cr-25Ni Austenitic Stainless Steel Parikin, Parikin; Dani, Mohammad; Dimyati, Arbi; Insani, Andon; Deswita, Deswita; Aziz, Ferhat; Mardiyanto, Mardiyanto; Mustofa, Salim; Purwanto, Setyo; Adhika, Damar Rastri; Syahbuddin, Syahbuddin; Huang, Ching An
Makara Journal of Technology Vol. 26, No. 1
Publisher : UI Scholars Hub

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Arc-plasma sintering (APS) for 5 s has been applied to the post tungsten inert gas (TIG) weld joint of Fe–15Cr–25Ni austenitic stainless steel (ASS). The treatment is intended to observe the effect of heat generated by plasma on micro-crystal structures around the fusion zone (FZ), especially internal stress relief in steel after being subjected to welding. The effect of stress relief in weld was measured using the neutron diffraction technique. ASS that is predominantly composed of Fe, Cr, and Ni elements, with contents of 57%, 15%, and 25%wt. respectively, was cut into two parts. Both parts were then welded with TIG without filler with a current and voltage of 60 A and 50 V, respectively. After APS for 5 s, the sample was characterized and analyzed using high-resolution powder neutron diffractometer at a high-temperature laboratory facility. The results show that the tensile residual stress decreased with the APS heat input. The residual stresses significantly decreased from 82.40 MPa to 1.21 MPa in the FZ and continued almost evenly from 65.92 MPa to 1.24 MPa in the heat-affected zone (HAZ). The residual stress is a tensile stress that can reduce the mechanical strength of materials. This condition is also applicable to applied loads. A microstructure gives a confirmation that the C element migrates from the FZ to HAZ. The content was very high in dark traces. The C element reacts to Cr and O to form chromium carbide (Cr23C6) and chromium carbonyl (CrC6O6), respectively. It rapidly migrates among its grain boundaries. It may also weaken materials and probably initiate intergranular cracks.

Co-Authors Abu Khalid Rivai Adhika, Damar Rastri Agusutrisno Agusutrisno, Agusutrisno Ambarwati, Vita Andon Insani Angraeni, Via Annette Heinzel Arbi Dimyati Bambang Sugeng Bery, Winda Surya Budi Untari Deswita Deswita Dian Fitriyani Dina Permata Wijaya Edi Suharyadi Elvaswer Elvaswer Engkir Sukirman Ferhat Aziz Firana, Ario Herlina Herlina Huang, Ching An Marzuki Silalahi Mawaddah, Zahrul Mohammad Dani Najma Annuria Fithri, Najma Annuria Parikin Parikin Salim Mustofa Setyo Purwanto Sofia Sandi Sulistioso G.S, Sulistioso Sulistioso Giat Sukaryo, Sulistioso Giat Syahbuddin Syahbuddin Syahfandi Ahda Taufiq, Agus Zarvianti, Enny Zavianti, Enny

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