Ari Handayani
Pusat Teknologi Bahan Industri Nuklir, Badan Tenaga Nuklir Nasional Kawasan Puspiptek Serpong, Tangerang Selatan 15340

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PENGARUH INHIBITOR KAFEINA PADA LAJU KOROSI DAN STRUKTUR MIKRO BAJA KARBON KS01 DAN AISI 1045 DALAM MEDIA AIR LAUT Giat S, Sulistioso; Purwanto, Setyo; ., Deswita; Handayani, Ari
Jurnal Iptek Nuklir Ganendra Vol 16, No 2 (2013)
Publisher : BATAN

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Abstract

Sejumlah material sintetis digunakan sebagai inhibitor untuk mencegah korosi, tetapi kebanyakan inhibitor tersebut bersifat racun, maka digunakan bahan organik sebagai inhibitor korosi, yang tidak berbahaya dan ramah lingkungan. Penggunaan inhibitor dikenal sangat baik, diantara beberapa metode pengendalian dan pencegahan korosi. Pada penelitian ini digunakan senyawa kafeina sebagai inhibitor korosi. Senyawa ini dapat digunakan sebagai inhibitor korosi karena adanya gugus-gugus yang mengandung pasangan elektron bebas, yaitu gugus nitrogen. Pengujian laju korosi dilakukan di media air laut yang diambil dari daerah Utara Indramayu dengan variasi konsentrasi kafeina 0, 50, 100, 150, dan 200 ppm untuk mengetahui konsentrasi optimum kafeina dalam menginhibisi laju korosi baja karbon KS01 dan AISI 1045 yang merupakan material yang banyak digunakan pada sistem pendingin di industri. Laju korosi baja karbon KS01 tanpa penggunaan inhibitor lebih kecil, yaitu 25,07 mpy dibandingkan dengan laju korosi baja karbon AISI 1045 yaitu sebesar 45,82 mpy. Hasil penelitian ini menunjukkan bahwa kafeina mampu menginhibisi laju korosi baja karbon KS01 dengan efisiensi optimum sebesar 64,38%, dan baja karbon AISI 1045 sebesar 66,63%. Konsentrasi optimum dari kafeina untuk menghibisi baja karbon AISI 1045 adalah 150 ppm dan untuk AISI KS01 adalah 100 ppm. Selain uji korosi dilakukan juga analisis struktur mikro dari kedua sampel di atas, sebelum dan sesudah diberi inhibitor.
HIDROKSIAPATIT BERPORI DARI KULIT KERANG ., Saryati; S., Sulistioso Giat; Handayani, Ari; Supardi, Supardi; Untoro, Pudji; Sugeng, Bambang
Jurnal Sains Materi Indonesia 2012: Desember 2012
Publisher : BATAN

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Abstract

Hidroksiapatit (HAp) Ca10(PO4)6(OH)2 merupakan material keramik bioaktif dengan bioafinitas yang tinggi dan bersifat biokompatibel terhadap tubuh manusia. Hidroksiapatit berpori saat ini sudah menjadi kebutuhan yang mendasar bagi rekonstruksi tulang yang patah atau retak. Sementara banyak limbah kulit kerang yang dapat digunakan sebagai bahan dasar pembuatan HAp untuk diproses lebih lanjut menjadi HAp berpori. HAp berpori dibuat melalui pembuatan komposit HAp-porogen. Telah dilakukan pembuatan hidroksiapatit dari kulit kerang dengan jalan reaksi pengendapan. Kulit kerang diubah menjadi CaO kemudian direaksikan dengan diamoniumfosfat dan endapannya dikalsinasi sehingga terbentuk HAp dimana kitosan digunakan sebagai porogen. Hasil yang diperoleh dikarakterisasi dengan X-Ray Diffractometer (XRD) dan Scanning ElectronMicroscope (SEM). Dari Data XRD terlihat bahwa kemurnian fasa HAp dipengaruhi oleh suhu kalsinasi. Diperoleh untuk HAp murni, suhu kalsinasi tidak lebih dari 700 oC. Morfologi permukaan serbuk HAp dan HAp berporogen, tidak terlihat perbedaan yang berarti, tersusun oleh bentuk granular (aglomerasi) dari partikel dengan ukuran berkisar 0,1 μm hingga 1 μm dan membentuk pori-pori dengan ukuran berkisar pada 0,1 μm hingga 1,0 μm. Sementara dalam bentuk pelet, permukaan HAp berporogen terlihat mempunyai pori-pori yang lebih besar dan lebih banyak dari HAp yang tidak berporogen.
MORPHOLOGY AND MAGNETIC PROPERTIES OF Fe/Fe-OXIDE CORE/SHELL NANOPARTICLE PREPARED BY HIGHENERGY MILLING PROCESS IN VARIED MEDIUM Handayani, Ari; Rifai, Muhammad; Pramono, Eko Yudho; ., Mujamilah
Jurnal Sains Materi Indonesia Vol 14, No 2 (2013): Januari 2013
Publisher : BATAN

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Abstract

This article discussed about milling process result of Femicrometer powder using high energy milling facillity SPEX 8000M on aquabidest, isoprophyl alcohol and Cethyl Trimethyl Ammonium Bromide (CTAB) liquid medium. The mixture were placed on stainless steel vial and Stainless Steel balls were added with weight ratio between powder and balls of 1 : 5. Structure and phase of resulted nanoparticles were analized from image and Selective Area Electron Diffraction (SAED) pattern observed by Transmission Electron Microscope (TEM). Magnetic properties were determined from hysteresis curve measured by Vibrating Sample Magnetometer (VSM). TEM image and SAED pattern showed the formation of Fe/Fe-oxide core/shell structure especially for powder milled in isoprophyl alcohol medium. Spherical particles having around 40 nm size with Fe core diameter of 30 nm and Fe-oxide shell thickness of 5 nm were provided in this medium. For another medium, unspherical and unhomogenize nanoparticles tend to be formed eventhough the core/shell structure still could be observed. These structures gave the end result of high saturation magnetization value of Ms = 175 emu/grams for isoprophyl alcohol system and lower for another system. This magnetization value also stable with time for isoprophyl alcohol system showing the more non-oxidative surface protection.Keywords: Fe/Fe-oxide core/shell nanoparticles, High energymilling,Aquabidest, Isoprophyl alcohol, CTAB, Morphology, Magnetic property.
SYNTHESIS OF MAGNETIC NANOPARTICLE OF CORE-SHELL Fe/Fe OXIDE USING CHEMICAL REDUCTION METHOD Sulungbudi, Grace Tj.; ., Mujamilah; Handayani, Ari
Jurnal Sains Materi Indonesia Vol 13, No 3 (2012): Juni 2012
Publisher : BATAN

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Abstract

This paper describes the synthesis ofmagnetic nanoparticles having core-shell structure in which Fe phase as a core were surrounded by Fe oxide phase as a shell. This structure is expected to give amagnetic nanoparticle having high magnetization value. Fe/Fe oxide core/shell nanoparticles were synthesis through reduction process of FeCl3 by NaBH4 reductor to produce zero valent Fe followed by surface modification using TMNO reactant to form Fe oxide phase layer around Fe. Morphology, phase composition and magnetic properties were optimized by varying mole ratio of FeCl3 and NaBH4 between 1 and 3. TEM observation showed the formation of core/shell structure with core sizes < 40 nm and shell ~ 5 nm especially for 1 : 2 compositions. However, phase analysis result showed, besides the Fe and Fe oxides phase, impurities phase of the Fe-B alloy and NaBH4 derivative phase are also present. This condition affects the magnetic properties formation and result in magnetization maximum value of only 72 emu/gram for the 1 : 2 composition.Keywords: Magnetic nanoparticles, Core-shell structure, Fe/Fe oxide, Phase, Magnetic properties.
POROUS HYDROXYAPATITE FROM CLAMSHELLS ., Saryati; S., Sulistioso Giat; Handayani, Ari; ., Supardi; Untoro, Pudji; Sugeng, Bambang
Jurnal Sains Materi Indonesia 2012: Desember 2012 - Edisi Khusus
Publisher : BATAN

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Abstract

Hydroxyapatite (HAp) Ca10(PO4)6(OH)2 is a bioactive ceramic material with high bioaffinity and biocompatible to the human body. Porous HAp is now a fundamental requirement for the reconstruction of a broken or fractured bones. There are waste a lot of clamshell waste in Indonesia that can be used as a base formanufacture of Hap and continued into porous HAp. Generally the porous HAp was made through HAp-porogen composite. Have been studied the manufacture of clamshells HAp by precipitation reactions. Clamshells converted into CaO and then reacted with diammonium phosphate and calcinated to form sediment Hap. It was used chitosan as a porogen. The results obtained were characterized by X-Ray Diffractometer (XRD) and Scanning Electron Microscope(SEM). From the XRD data shows that the phase purity of HAp is affected by calcination temperature. The conclusions are that to obtain pure HAp calcination temperature not exceeding 700 °C. Surface morphology of HAp and porous HAp powder, look no significant difference, composed of granular forms (agglomeration) of particles with a size range from 0.1 - 1 μm and form pores-pore size is about 0.1 - 1.0 μm. Meanwhile, in the form of pellets, porous HAp surface pores seem to have a bigger and more of HAp are not porous.Keywords: Hydroxyapatite, Chitosan, Clamshell.
PREPARATIONANDCHARACTERIZATION OF POROUS HYDROXYAPATITE FROM FISH BONE Handayani, Ari; S., Sulistioso Giat; ., Deswita
Jurnal Sains Materi Indonesia Vol 14, No 1 (2012): Oktober 2012
Publisher : BATAN

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Abstract

Have been carried out making porous hydroxyapatite (HAp) with base material of fish bones waste, as porogen agent chitosan by themethod of calcination at a temperature of 1100 ° C for 5 hours. Thermogravimetric analysis performed by Simultaneous Thermal Analyzer (STA), the phase identification was done by X-Ray Diffractometer (XRD) and microstructure was analyzed by Scanning Electron Microscope (SEM). Thermogravimetric analysis showed the peak of weight loss at 365.6 ° C and after 500 ° C weight loss does not occur again. XRD pattern indicates the presence of hydroxyapatite phase on the raw fish bones and fish bones after calcined at 1100 °C for 5 hours. SEM results showed inter particle porous microstructure on raw fish bones and after calcining 1100 °C, 5 hours with a particle size of about 0.1 - 1.0 μm. After the addition of chitosan pores between the particles are formed more evenly and clearly.Keywords: Fish bone, Hydroxyapatite, Chitosan, XRD, SEM.
SINTESIS DAN KARAKTERISASI KOMPOSIT POLIPROPILENA/SERBUK KAYU GERGAJI Sudirman, Sudirman; K., Aloma K.; Gunawan, Indra; Handayani, Ari; Hertinvyana, Evi
Jurnal Sains Materi Indonesia VOL 4, NO 1: OKTOBER 2002
Publisher : Center for Science & Technology of Advanced Material - National Nuclear Energy Agency of

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (221.497 KB) | DOI: 10.17146/jusami.2002.4.1.4889

Abstract

SINTESIS DAN KARAKTERISASI KOMPOSIT POLIPROPILENA/SERBUK KAYU GERGAJI. Komposit polimer polipropilena (PP) dengan bahan pengisi (filler) Serbuk Kayu Gergaji (SKG) merupakan bahan komposit alternatif. Penyebaran bahan pengisi dalam bahan komposit ini secara random atau acak dengan komposisi SKG 10, 30 dan 50 % fraksi volume. Dari sintesis bahan komposit dengan berbagai komposisi dilakukan pengujian mekanik (kuat tarik), sifat fisik (titik leleh dan suhu dekomposisi), strukturmikro dan derajat kristalinitas dengan menggunakan SEM dan XRD. Dari hasil penelitian ini diperoleh kesimpulan bahwa seiring dengan penambahan bahan pengisi, kuat tarik, titik leleh, suhu dekomposisi dan derajat kristalinitas mengalami penurunan. Jika dibandingkan antara komposit bermatriks PP MF 2 dengan komposit PP MF 10, untuk kuat tarik komposit bermatriks PP MF 10 lebih tinggi 4,24 % dibanding komposit bermatriks PP MF 2. Untuk titik leleh, komposit bermatriks PP MF 10 lebih tinggi 4,09 % dari komposit bermatriks PP MF 2 dan perbedaan suhu dekomposisi antara komposit bermatriks PP MF 10 dengan komposit bermatriks PP MF 2 hanya 0,17 %. Komposit bermatriks PP MF 10 mempunyai nilai derajat kristalinitas yang lebih tinggi 2,55 % dibanding komposit bermatriks PP MF 2. Komposit dengan derajat kristalinitas yang lebih tinggi mempunyai kuat tarik yang lebih tinggi.
SINTESIS DAN KARAKTERISASI MICROSPHERE BERBASIS POLIMETIL META AKRILAT (PMMA) Gunawan, Indra; Darwinto, Tri; D, Sudaryanto; Handayani, Ari
Jurnal Sains dan Teknologi Nuklir Indonesia Vol 4, No 4 (2003): Agustus Edisi Khusus 4 2003
Publisher : BATAN

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Abstract

SINTESIS DAN KARAKTERISASI MICROSPHERE BERBASIS POLIMETIL META AKRILAT (PMMA). Telah dilakukan studi tentang pengaruh konsentrasi PMMA terhadap bentuk dan ukuran microsphere dengan menggunakan scanning electron microscope (SEM). Sintesis microsphere dilakukan dengan metode pengadukan dan evaporasi larutan dan suatu sistem emulsi. Proses emulsifikasi dilakukan dengan mencampurkan larutan PMMA di dalam pelarut kloroform dengan variasi konsentrasi 1, 4, 8 dan 16 % (b/b) kedalam larutan PVA di dalam pelarut aquades dengan konsentrasi 1 % (b/b). Hasil yang diperoleh menunjukkan bahwa ukuran dan bentuk microsphere dipengaruhi oleh konsentrasi larutan polimer. Pada konsentrasi PMMA terlalu rendah (1% b/b) atau konsentrasi PMMA terlalu besar(16% b/b) diperoleh ukuran microsphere beragam dari 20 - 200 µm, sedangkan pada konsentrasi polimer PMMA 4% dan 8% (b/b) diperoleh ukuran microsphere yang relatif seragam sebesar 20 µm. Analisis ketahanan panas dengan menggunakan differental thermal analyzer (DTA) diperoleh titik gelas microsphere berbasis PMMA, Tg berkisar pada 256,5 °C dan entalpi gelas ?H = 1,476 J/g. Sedangkan suhu leleh Tm = 275,8 oC dengan entalpi leleh ?H = -12,72 J/g dan suhu dekomposisi Td = 3 73,4 oC dengan entalpi dekomposisi ?H =-27,86 J/g.
GENERALIZED VARIANCE FUNCTIONS FOR BINOMIAL VARIABLES IN STRATIFIED TWO-STAGE SAMPLING Handayani, Ari; ., Aunuddin; ., Indahwati
FORUM STATISTIKA DAN KOMPUTASI Vol. 10 No. 1 (2005)
Publisher : FORUM STATISTIKA DAN KOMPUTASI

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Abstract

      This empirical study evaluates the application of Generalized Variance Functions (GVFs) for binomial variables in the 1998 Indonesian Labor Force Survey. The survey employs stratified two-stage cluster sampling for selecting samples from a population of households. The study covers all provinces in Java to produce estimates at the level of Java Island. The relative variance estimates resulted from the GVF models are compared to the relative variance estimates which are computed directly. The results illustrate that  model  expressed by logarithmic model  log = log c + d log () gives a good approximation to estimate the variances for the nonagricultural employment group, especially for working male category both in urban and rural areas. It is also good for the total employment group differentiated by age group, educational attainment, and employment status. On the other hand, the model gives poor results for the agricultural employment group. Based on the empirical results, the GVF models may not perform particularly well for the common characteristics which have relatively dissimilar deff values to majority of characteristics in the same group, since these characteristics usually come out among all persons in the sample household and often among all households in the sample cluster as well. The success of the GVF technique depends critically on the grouping of the estimates total () and amount of characteristics involved as the observations for fitting the model. Furthermore, observations with relatively large residuals will also determine the performance of goodness-of-fit of the model. Application of GVF technique to obtain an approximate standard error on numerous binomial characteristics in large scale survey should be carried out further using extensive data. The better performance of GVF model may also be accomplished by utilizing, for examples, weighted least squares procedure or robust regression method. Additionally, the data users should be warned that there will inevitably be survey characteristics for which GVF's will give poor results or even no GVF will be appropriate. Keywords :  Generalized Variance Functions, Stratified Two-Stage Sampling
Analisis Struktur Kristal Lifepo4 Olivine Sebagai Bahan Katoda Batere Li-Ion Gunawan, Indra; Handayani, Ari; Yusuf, Saeful
Jurnal Kimia dan Kemasan Vol. 35 No. 2 Oktober 2013
Publisher : Balai Besar Kimia dan Kemasan

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Abstract

Sintesis LiFePO4 dilakukan dengan pencampuran LiCl, FeCl2.4H2O dan H3PO4 ekuimolar ke dalam air. Homogenasi larutan dilakukan dengan pengaduk magnetic pada suhu 60o C. Prekursor LiFePO4 diperoleh setelah pemanasan 200o C dengan furnace selama 2 jam. Sintering prekursor LiFePO4 dilakukan pada suhu 700o C dengan furnace selama 4 jam dengan aliran N2 untuk membentuk fasa kristalit LiFePO4. Kemurnian fasa dan struktur kristal dianalisis dengan menggunakan XRD. Analisis struktur kristal dari pola difraksi sinar-X dilakukan dengan perangkat lunak FULLPROF. Pengamatan morfologinya dilakukan dengan menggunakan SEM dengan kombinasi energy dispersive spectroscopy (EDS) dan pengukuran gugus fungsional dengan FT-IR. Hasil analisis struktur kristal menunjukkan bahwa senyawa LiFePO4 memiliki struktur Kristal orthorhombic, space group 62, simbol Pnma (Hermann-Mauguin) dengan parameter kisi a= 6.0019999, b= 10.330000, c= 4.6999998.