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All Journal Program Kreativitas Mahasiswa - Penelitian Jurnal Matematika dan Ilmu Pengetahuan Alam Dental Journal (Majalah Kedokteran Gigi) Indonesian Applied Physics Letters Jurnal Ilmu Administrasi: Media Pengembangan Ilmu dan Praktek Administrasi
Aminatun Aminatun
Department Of Physics, Faculty Of Mathematics And Physics, Universitas Airlangga
Chemical Engineering, Chemistry & Bioengineering Dentistry Electrical & Electronics Engineering Materials Science & Nanotechnology Mathematics Physics Social Sciences

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SINTESIS PADUAN KOBALT MELALUI TEKNIK PELEBURAN DAN KARAKTERISASINYA SEBAGAI IMPLAN TULANG PROSTHESIS Normasari Susanto, Efinda Putri; Indriani, Arista; Himawati, Umi; Aminatun, Aminatun
Program Kreativitas Mahasiswa - Penelitian PKM-P 2013
Publisher : Ditlitabmas, Ditjen DIKTI, Kemdikbud RI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (669.295 KB)

Abstract

Cobalt-based alloys are widely used to be prosthesis because of their excellent properties. In this work, cobalt alloys variation of Cr have been synthesized by smelting method and accompanied by rolling process. The evaluated material properties show that microstructure dominant by γ phase. It was also found that the whole process of synthesis have good solubility. Hardness value show variation of 33% Cr include on the range of ASTMF75 that is 345,24 VHN. Corrosion test result show variation of 31,5% and 34,5% Cr satisfy corrosion rate of Europe standard (0,457 mpy). But on the other hand, they have good biocompatibility.Keywords: Cobalt alloys prosthesis, microstructure, hardness value, corrosion rate, cytotoxicity.
Kajian Proses Sintering pada Metode Metalurgi Serbuk Paduan Kobalt Sebagai Kandidat Material Implan Tulang Aminatun, Aminatun
Jurnal Matematika dan Ilmu Pengetahuan Alam Vol 17, No 1 (2015)
Publisher : Universitas Airlangga

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Abstract

This study aimed to find out the optimum sintering temperature and time on the powder metallurgy method to produce cobalt alloy as candidate bone implants material. The quality of the metal alloy of the metallurgi method is determined by the temperature and time of sintering, resulting in the selection of these two parameters will be generated alloy which has a crystal structure as expected with better mechanical properties along with the crystal structure. The sintering process used powder metallurgy method with composition of 63.75 % Co - 30 % Cr - 5 % Mo - 0 , 5 % Mn - 0 , 5 % Si - 0 , 25 % N adjusted to ASTM F75. The initial step is all the ingredients of the milling process were mixed at a speed of 350 rpm for 15 minutes. Furthermore, powder was compressed with 21 MPa pressure at 200°C with 10 minutes holding time in the form of pellets with diameter of 1.5 cm. The pellet was sintered with temperature variations of 1100 ºC, 1200 ºC and 1300 ºC for 2 hours holding timeeach, and at a temperature of 1300 ºC with a variation of 1 hour and 3 hours holding time. The results showed that the crystal structure of the cobalt alloy contained 3 phase, which are phase γ (FCC), phase ɛ (HCP), and σ phase (tetragonal). γ phase appears at a temperature of 1300ºC with 1 and 2 hours holding time. The emergence of this γ -phase led to the increase of cobalt alloy hardness value, because γ –phase is a stable phase with a density greater than the other phases. The highest hardness value of 304.7 ± 9.0VHN with the largest γ-phase fraction (34.9 %) was obtained at a sintering temperature of 1300 ºC with 2 hours holding time. SEM - EDX test results indicated that cobalt alloys still contain pores or cavities with the uneven elements distribution and oxidation occurs. Based on these results it can be concluded that the sintering temperature of 1300 ºC with 2 hours holding time is the optimal sintering temperature and time to produce a cobalt alloy which has potential as bone implant material in terms of hardness value.Keywords: cobalt alloy, powder metallurgy, sintering
The Copper concentration variation to physical properties of high copper amalgam alloy Aminatun Aminatun
Dental Journal (Majalah Kedokteran Gigi) Vol. 39 No. 3 (2006): September 2006
Publisher : Faculty of Dental Medicine, Universitas Airlangga https://fkg.unair.ac.id/en

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (366.919 KB) | DOI: 10.20473/j.djmkg.v39.i3.p133-137

Abstract

The function of copper (Cu) inside amalgam is to increase hardness and impact force and to decrease thermal expansion coefficient. In general, amalgam which is used in dentistry and available in the market is contain Cu 22%, while the maximum Cu concentration is 30%. It is necessary to determine the concentration Cu does generate the best physical properties to be used as dental restorative agent. Amalgam is made by mixing blended-metal Ag-Sn-Cu (with Cu concentration of 13%, 21%, 22%, and 29%) and Hg, stirred manually in a bowl for 15 minutes,leave it in temperature 27°C for 24 hours to become hardened. The result of X-Ray Diffractometer (XRD), analyzed by Rietveld method and Rietica program, shows amalgam with Cu 29% concentration for Cu3Sn compound density is 31.790 sma/Å3, for Ag2Hg3 compound is 41.733 sma/ Å3, a Cu3Sn relative weight percentage of 43.23%, Ag2Hg3 of 54.54%, Cu 7Hg6 of 2.23% and hardness of Cu 29% is 90.700 ± 0.005 kgf/mm2. These numbers are the highest values on Cu 29% concentrations compared to other copper concentration variants. Whereas amalgam thermal expansion coefficient on Cu 29% is (2.17 ± 0.91)10-3 mm/°C is the lowest value compared to other Cu concentration. The conclution is that adding Cu concentration into amalgam will increase density value, Cu3Sn relative weight percentage, hardness level and will decrease amalgam thermal expansion coefficient. Amalgam 29% Cu concentration has better physical properties compared to amalgam Cu 22% concentration.
3D Printing Geometric Scaffold Design Variation of Injectable Bone Substitutes (IBS) Pa Dyah Hikmawati; Sarda Nugraheni; Aminatun Aminatun
Indonesian Applied Physics Letters Vol. 1 No. 2 (2020): Desember
Publisher : Universitas Airlangga

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/iapl.v1i2.23447

Abstract

3D printing technology application in tissue engineering could be provided by designing geometrical scaffold architecture which also functionates as drug delivery. For drug delivery scaffold on bone tuberculosis, the cell pore of the geometric design was filled with Injectable Bone Substitutes (IBS) which had streptomycin as anti-tuberculosis. In this study, scaffolds were synthesized in three cells geometric filled by Injectable Bone Substitutes (IBS), Hexahedron, Truccated Hexahedron, and Rhombicuboctahedron, which had 2.5 mm x 2.5 mm x 2.5 mm size dimension and 0.8 mm strut. The final design was printed in 3D with polylactic acid (PLA) filament using the FDM process (Fused Deposition Modelling). The composition of IBS paste was a mixture of hydroxyapatite (HA) and gelatine (GEL) 20% w/v with a ratio of 60:40, streptomycin 10 wt% and hydroxypropyl methylcellulose (HPMC) 4% w/v. It was then characterized using Fourier-transform infrared spectroscopy (FTIR). Scaffold–paste characterization was included pore size test of 3D printing result before and after injected using Scanning Electron Microscope SEM, porosity test, and compressive strength test. The result showed that the pore of scaffold design was 1379 µm and after injected with IBS paste, the pore leaving 231.04 µm of size. The scaffold with IBS paste porosity test showed ranges between 40,78-70,04% while the compressive strength of before and after injected ranges between 1,110-634 MPa and 2,217-6,971 MPa respectively. From the test results, the scaffold 3D printing with IBS paste in this study had suitable physical characteristics to be applicated on cancellous bones which were infected by tuberculosis.
MECHANICAL CHARACTERISTIC STUDY OF COBALT ALLOY PREPARED BY POWDER METALLURGY METHOD Aminatun Aminatun; Jan Ady; Mega Farynda KD
Indonesian Applied Physics Letters Vol. 1 No. 2 (2020): Desember
Publisher : Universitas Airlangga

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/iapl.v1i2.23448

Abstract

This study was conducted to determine the effect of compaction pressure and sintering temperature variations on the properties of physical, mechanical, and micro cobalt alloy. Manufacture of the cobalt alloy with compositions 63,75%, chromium 30%, molybdenum 5%, manganese 0,5%, silicon 0,5%, and 0,25% nitrogen using powder metallurgy method. Variations of compaction pressure were 339,70 MPa, 396,31 MPa, dan 452,93 MPa, and sintered at temperature 12000C and 130 0C for 2 hours of holding time. Density was increased along with the increasing compaction pressure and sintering temperature (3,9-6,6 g/cm). The hardness was also increased along with the increasing compaction pressure and sintering temperature  205,1-316,2 VHN. XRD results showed that γ phase with fcc structure was formed at the temperature of 12000C and 13000C for all variations of pressure. SEM-EDX results showed that the oxygen content decreased along with increasing compaction pressure and sintering temperature. Based on ASTM F75 hardness standard, the sample with compaction pressure 452,93 MPa and sintered at 13000C was the best cobalt alloy with a hardness value of 316.2 VHN.
PENGELOLAAN BANTUAN DANA HIBAH REVITALISASI POSYANDU DARI PEMERINTAH PROPINSI JAWA BARAT PADA KECAMATAN CIMAHI TENGAH KOTA CIMAHI Dinoroy Marganda Aritonang; Aminatun Aminatun
Jurnal Ilmu Administrasi: Media Pengembangan Ilmu dan Praktek Administrasi Vol. 11 No. 2 (2014): Jurnal Ilmu Administrasi
Publisher : Sekolah Tinggi Ilmu Administrasi Lembaga Administrasi Negara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31113/jia.v11i2.45

Abstract

Pengelolaan dana hibah merupakan salah satu hal yang masih jarang diteliti, setidaknya dalam kontek penelitianadmininistrasi publik. Dalam tulisan ini, diuraikan secara sederhana bagaimana pengelolaan dana hibah yang diberikanoleh pemerintah daerah kepada posyandu yang berada dalam wilayah kerjanya. Penelitian ini berbasis kualitatif dengansifat yang deskriptif. Di dalam penelitian ini ditemukan beberapa hal yang mungkin merupakan persoalan yang hampirsama pada jenis-jenis dana hibah lainnya. Yang membuat menarik adalah bagaimana posyandu menggunakan danahibah yang amat sedikit dengan tujuan agar terjadi peningkatan strata bagi tiap posyandu. Oleh karena itu dalampenelitian ini disampaikan beberapa hal yang menjadi persoalan dan kondisi nyata bagaimana pola pengelolaan danahibah tersebut.
Co-Authors Arista Indriani Dinoroy Marganda Aritonang Efinda Putri Normasari Susanto Jan Ady Mega Farynda KD Sarda Nugraheni Umi Himawati