Continuidad en la técnica de elaboración de moldes para el vaciado de plata en el área centro andina desde la época precolombina hasta la actualidad

Energy Dispersive ◽

X Ray Diffraction ◽

X Ray ◽

Aisi 316 ◽

Telah dilakukan sintesis dan karakterisasi membran ZSM-5 dengan penyangga kasa jenis 304 ukuran 200 dan 400 mesh dan jenis kasa AISI 316 ukuran 180 mesh. Tujuan penelitian ini adalah mensintesis membran ZSM-5 dengan penyangga kasa jenis 304 ukuran 200 dan 400 mesh dan jenis kasa AISI 316 ukuran 180 mesh dan mengkarakterisasi membran ZSM-5 hasil sintesis. Sintesis membran dilakukan dengan cara melapiskan prekursor ZSM-5 (coating) pada penyangga kasa yang telah diberi perlakuan dan dipanaskan pada suhu 90 °C selama 4 hari. Selanjutnya, membran yang dihasilkan dikarakterisasi engan metoda X-ray diffraction (XRD), scanning electron microscope-energy dispersive spectroscopy (SEM-EDS) dan Fourier-transform infrared (FTIR). Hasil citra SEM-EDS menunjukkan bahwa ukuran membran ZSM-5 yang semakin besar, menghasilkan jumlah lubang atau pori semakin banyak dengan luasan pori yang semakin kecil. Pola difraksi XRD menunjukkan bahwa membran yang dihasilkan mempunyai intensitas tertinggi pada 2 8º dan 23º yang merupakan karakteristik dari ZSM-5. Hasil spektra FTIR menunjukkan adanya serapan pada bilangan gelombang 450 cm-1yang merupakan ciri khas membran ZSM-5.Characterization of ZSM-5 Membranes Synthesized by Variation of Support Types and Sizes. Synthesis and characterization of ZSM-5 membrane were carried out with 304 type 200 and 400 mesh gauze supports and 180 mesh AISI 316 gauze types. The purpose of this study was to synthesize ZSM-5 membrane with 304 type 200 and 400 mesh gauze support and AISI 316 type 180 mesh size 180 mesh and characterize the synthesized ZSM-5 membrane. Membrane synthesis was carried out by coating the pre-treated gauze support with the ZSM-5 precursor and was heated at 90 °C for 4 days. Furthermore, the resulting membrane was characterized by X-ray diffraction (XRD), scanning electron microscope-energy dispersive spectroscopy (SEM-EDS) dan Fourier-transform infrared (FTIR). The SEM-EDX analysis shows that the increasing of ZSM-5 membrane size allowed pores number to increase with smaller pore surface area. The X-ray Diffraction pattern (XRD) shows that the resulting membrane has the highest intensity at 2 of 8º and 23º as the characteristics of ZSM-5. The FTIR spectra results show absorption at wavenumbers 450 cm-1 which is a characteristic of ZSM-5 membranes.

Pengaruh Suhu Kalsinasi terhadap Karakteristik Komposit Forsterit-Karbon Tersintesis dalam Medium Gas Argon

ALCHEMY Jurnal Penelitian Kimia ◽

10.20961/alchemy.16.2.34845.12-19 ◽

2020 ◽

Vol 16 (2) ◽

pp. 12

Author(s):

Solihudin Solihudin ◽

Haryono Haryono ◽

Atiek Rostika Noviyanti ◽

Muhammad Rizky Ridwansyah

Keyword(s):

Fourier Transform ◽

Electron Microscope ◽

Rice Husk ◽

Carbon Composite ◽

X Ray Diffraction ◽

Argon Gas ◽

X Ray ◽

Komposit forsterit-karbon merupakan salah satu material modifikasi dari forsterit yang berpotensi memiliki sifat isolator panas baik. Karbon dalam komposit dapat mengisi cacat titik pada kristal forsterit. Arang sekam padi (residu gasifikasi) mengandung SiO2 amorf dan karbon yang tinggi. Penelitian ini bertujuan menentukan pengaruh suhu kalsinasi dalam medium gas inert (dengan pengaliran gas argon) terhadap karakteristik komposit forsterit-karbon dari arang sekam padi dan magnesium karbonat. Metode penelitian meliputi preparasi arang sekam padi hasil gasifikasi, dan sintesis forsterit-karbon. Proses sintesis komposit forsterit karbon dilakukan dengan cara mencampurkan arang sekam padi dengan kalium karbonat pada rasio mol magmesium terhadap silikon sebesar 2 : 1 kemudian dikalsinasi dengan suhu divariasikan (700, 800, 900, dan 1000 oC). Selanjutnya sampel hasil sintesis dikarakterisasi dengan Fourier-transform infrared (FTIR), X-ray diffraction (XRD), dan scanning electron microscope-energy dispersive spectroscopy (SEM-EDS). Hasil karakterisasi dengan FTIR dan XRD diperoleh kesimpulan bahwa forsterit mulai terbentuk pada suhu kalisiasi 800 oC dan sempurna pada suhu 1000 oC, karenanya komposit yang terbentuk pada 1000 oC dimungkinkan sebagai forsterit-karbon, di mana unsur-unsur yang terkandung ditunjukkan oleh SEM-EDS. The Effect of Calcination Temperature on the Characteristics of Forsterite-Carbon Composites Synthesized in Argon Gas Medium. Forsterite-carbon composite is one of the material modifications of forsterite, which potentially has a good heat insulation property. Carbon in composites can fill point defects in forsterite crystals. Rice husk charcoal, as gasification residues, contains high amorphous SiO2 and carbon. This study aims to determine the effect of temperature on the calcination of a mixture of rice husk charcoal and magnesium carbonate under an inert gas (argon gas) on the characteristics of the forsterite-carbon composite produced. The experimental research performed includes the preparation of gasified rice husk charcoal and the synthesis of the carbon-forsterite composite. The synthesis process of the carbon-forsterite composites was carried out by mixing rice husk charcoal with potassium carbonate at a mole ratio of magnesium to silicon of 2 : 1. The mixture was then calcined with varying temperatures (700, 800, 900, and 1000 °C). Furthermore, the synthesized sample was characterized by Fourier-transform infrared (FTIR), X-ray diffraction (XRD), and scanning electron microscope-energy dispersive spectroscopy (SEM-EDS). The FTIR and XRD analysis show that the forsterites began to form at a calcination temperature of 800 °C and perfectly formed at a temperature of 1000 °C; therefore, the composite formed at 1000 °C is possible as forsterite-carbon, in which the contained elements were indicated by SEM-EDS.

Integrated Electron Backscatter Diffraction and X-Ray Energy Dispersive Spectroscopy in the Scanning Electron Microscope

Microscopy and Microanalysis ◽

10.1017/s1431927605501132 ◽

2005 ◽

Vol 11 (S02) ◽

Cited By ~ 1

Author(s):

S I Wright ◽

M M Nowell

Keyword(s):

Electron Microscope ◽

Electron Backscatter Diffraction ◽

Energy Dispersive ◽

X Ray ◽

Electron Backscatter ◽

Backscatter Diffraction ◽

ANALISIS PENGARUH LAJU PUTAR TERHADAP KOROSI BAJA KARBON API 5LX65 MENGGUNAKAN METODE ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY

Jurnal Teknologi Bahan dan Barang Teknik ◽

10.37209/jtbbt.v2i1.17 ◽

2012 ◽

Vol 2 (1) ◽

pp. 1

Author(s):

Agus Solehudin ◽

Asep Lukman

Keyword(s):

Electron Microscope ◽

Electrochemical Impedance Spectroscopy ◽

Impedance Spectroscopy ◽

Electrochemical Impedance ◽

Energy Dispersive ◽

X Ray ◽

Pada percobaan ini, telah dipelajari pengaruh laju putar terhadap laju korosi baja karbon API 5LX65 yang direndam selama 24 jam dalam larutan NaCl 3,5% + 500 mg/L H2S menggunakan metode EIS (Electrochemical Impedance Spectroscopy) pada suhu 50oC dan pH 4 dengan variasi laju putar 50 rpm, 150 rpm, dan 250 rpm. Hasil percobaan memperlihatkan pergeseran dan penyempitan kurva setengah lingkaran impedansi imaginer terhadap impedansi real, dengan meningkatnya laju putar dari 50 rpm sampai dengan 250 rpm. Hal ini mengindikasikan bahwa aktifitas pelarutan baja meningkat dengan percepatan laju putar. Nilai Cdl meningkat dengan meningkatnya laju putar. Nilai tahanan polarisasi (Rp) semakin menurun dengan meningkatnya laju putar, sementara nilai tahanan larutan (Rs) relatif tidak berubah. Potensial korosi pada laju putar 50 rpm, 150 rpm dan 250 rpm stabil pada -517 mV hingga -508 mV terhadap Ag/AgCl. Gabungan pengamatan Scanning Electron Microscope (SEM), Energy Dispersive Spectroscopy (EDS) dan X-Ray Diffractomer (XRD) menunjukkan terbentuknya lapisan produk korosi. Hasil analisis XRD spesimen uji yang dikorosikan pada suhu 50oC selama 24 jam menunjukkan bahwa lapisan produk korosi mengandung besi sulfida (FeS). Morfologi permukaan spesimen ini memperlihatkan adanya korosi sumuran.Kata kunci: laju putar, korosi, baja karbon, EIS, H2S

Electrochemical Fabrication of Niobium Silicon Alloys from Oxide Powder Mixtures

ISRN Metallurgy ◽

10.1155/2013/429818 ◽

2013 ◽

Vol 2013 ◽

pp. 1-5 ◽

Cited By ~ 1

Author(s):

Fanke Meng ◽

Huimin Lu

Keyword(s):

Electron Microscope ◽

Oxide Powder ◽

Energy Dispersive ◽

X Ray Diffraction ◽

Silicon Alloys ◽

Powder Mixtures ◽

X Ray ◽

Electrochemical Fabrication ◽

NbSi alloys were prepared by direct electrochemically reducing four mixed Nb2O5 and SiO2 powders (Nb-10Si, Nb-20Si, Nb-30Si, and Nb-37.5Si) in molten CaCl2 electrolyte at 900°C. The samples were characterized with scanning electron microscope (SEM), X-ray diffraction (XRD), and energy-dispersive X-ray spectroscopy (EDX). No oxidized phases were remained by XRD tests. Under SEM, Nb phase was scattered in Nb5Si3 phase for the samples of Nb-10Si, Nb-20Si, and Nb-30Si. For the sample of Nb-37.5Si, only Nb5Si3 was obtained after electrolysis.

Formation of Flower-Like Crystals of Tris(8-hydroxyquinoline)aluminum from 8-Hydroxyquinoline on Anodic Porous Alumina

Advances in Materials Science and Engineering ◽

10.1155/2017/4150648 ◽

2017 ◽

Vol 2017 ◽

pp. 1-10 ◽

Cited By ~ 2

Author(s):

Shohei Yamaguchi ◽

Tomohiro Iida ◽

Kazunori Matsui

Keyword(s):

Electron Microscope ◽

Porous Alumina ◽

Energy Dispersive ◽

X Ray Diffraction ◽

X Ray ◽

Anodic Porous Alumina ◽

Microscope Images ◽

Green Photoluminescence ◽

The treatment of anodic porous alumina (APA) plates in heated water containing 8-hydroxyquinoline (HQ) produces crystalline tris(8-hydroxyquinoline)aluminum (Alq3) microbelts about 5–10 μm wide and 5–20 μm long. These microbelts were found to aggregate to form flower-like structures on the surface. X-ray diffraction studies indicated that the Alq3 microbelts are composed of an α-phase having a meridional structure. The Alq3 microbelts exhibited green photoluminescence with a peak at around 520 nm. Scanning electron microscope images and energy dispersive X-ray spectra showed that this reaction is induced at the APA surface by the reaction between the HQ and amorphous Al2O3 species.

Laser Gas Assisted Nitriding and TiN Coating of Ti-6Al-4V Alloy

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.264-265.421 ◽

2011 ◽

Vol 264-265 ◽

pp. 421-426

Author(s):

O. Al-Mana ◽

M.S.J. Hashmi ◽

Bekir Sami Yilbas

Keyword(s):

Electron Microscope ◽

Treatment Process ◽

Parameter Analysis ◽

X Ray Diffraction ◽

Tin Coating ◽

X Ray ◽

Heating Model ◽

Laser gas assisted nitriding and TiN coating of Ti-6Al-4V alloy is carried out. The microstructures developed in the laser irradiated region are examined using Scanning Electron Microscope (SEM), Energy Dispersive Spectroscopy (EDS), and X-ray Diffraction (XRD). The laser nitrided surfaces are coated with TiN using the PVD facility to enhance the tribological properties. The heating model incorporating the lump parameter analysis is used to predict the melt layer thickness during the laser treatment process. It is found that laser nitrided surfaces posses δ-TiN+ε-TiN phases and TiN coating of laser nitrided surfaces improves the microhardness at the surface.

Pengaruh Suhu Kalsinasi terhadap Karakteristik Komposit Forsterit-Karbon Tersintesis dalam Medium Gas Argon

ALCHEMY Jurnal Penelitian Kimia ◽

10.20961/alchemy.16.2.34845.163-170 ◽

2020 ◽

Vol 16 (2) ◽

pp. 163

Author(s):

Solihudin Solihudin ◽

Haryono Haryono ◽

Atiek Rostika Noviyanti ◽

Muhammad Rizky Ridwansyah

Keyword(s):

Fourier Transform ◽

Electron Microscope ◽

Rice Husk ◽

Carbon Composite ◽

X Ray Diffraction ◽

Argon Gas ◽

X Ray ◽

Komposit forsterit-karbon merupakan salah satu material modifikasi dari forsterit yang berpotensi memiliki sifat isolator panas baik. Karbon dalam komposit dapat mengisi cacat titik pada kristal forsterit. Arang sekam padi (residu gasifikasi) mengandung SiO2 amorf dan karbon yang tinggi. Penelitian ini bertujuan menentukan pengaruh suhu kalsinasi dalam medium gas inert (dengan pengaliran gas argon) terhadap karakteristik komposit forsterit-karbon dari arang sekam padi dan magnesium karbonat. Metode penelitian meliputi preparasi arang sekam padi hasil gasifikasi, dan sintesis forsterit-karbon. Proses sintesis komposit forsterit karbon dilakukan dengan cara mencampurkan arang sekam padi dengan kalium karbonat pada rasio mol magmesium terhadap silikon sebesar 2 : 1 kemudian dikalsinasi dengan suhu divariasikan (700, 800, 900, dan 1000 oC). Selanjutnya sampel hasil sintesis dikarakterisasi dengan Fourier-transform infrared (FTIR), X-ray diffraction (XRD), dan scanning electron microscope-energy dispersive spectroscopy (SEM-EDS). Hasil karakterisasi dengan FTIR dan XRD diperoleh kesimpulan bahwa forsterit mulai terbentuk pada suhu kalisiasi 800 oC dan sempurna pada suhu 1000 oC, karenanya komposit yang terbentuk pada 1000 oC dimungkinkan sebagai forsterit-karbon, di mana unsur-unsur yang terkandung ditunjukkan oleh SEM-EDS. The Effect of Calcination Temperature on the Characteristics of Forsterite-Carbon Composites Synthesized in Argon Gas Medium. Forsterite-carbon composite is one of the material modifications of forsterite, which potentially has a good heat insulation property. Carbon in composites can fill point defects in forsterite crystals. Rice husk charcoal, as gasification residues, contains high amorphous SiO2 and carbon. This study aims to determine the effect of temperature on the calcination of a mixture of rice husk charcoal and magnesium carbonate under an inert gas (argon gas) on the characteristics of the forsterite-carbon composite produced. The experimental research performed includes the preparation of gasified rice husk charcoal and the synthesis of the carbon-forsterite composite. The synthesis process of the carbon-forsterite composites was carried out by mixing rice husk charcoal with potassium carbonate at a mole ratio of magnesium to silicon of 2 : 1. The mixture was then calcined with varying temperatures (700, 800, 900, and 1000 °C). Furthermore, the synthesized sample was characterized by Fourier-transform infrared (FTIR), X-ray diffraction (XRD), and scanning electron microscope-energy dispersive spectroscopy (SEM-EDS). The FTIR and XRD analysis show that the forsterites began to form at a calcination temperature of 800 °C and perfectly formed at a temperature of 1000 °C; therefore, the composite formed at 1000 °C is possible as forsterite-carbon, in which the contained elements were indicated by SEM-EDS.

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment ◽

X-ray energy dispersive spectroscopy of uranium ore using a TES microcalorimeter mounted on a field-emission scanning electron microscope

10.1016/j.nima.2011.06.005 ◽

2011 ◽

Vol 648 (1) ◽

pp. 285-289 ◽

Cited By ~ 4

Author(s):

Keisuke Maehata ◽

Kazuya Idemitsu ◽

Keiichi Tanaka

Keyword(s):

Electron Microscope ◽

Field Emission ◽

Energy Dispersive ◽

X Ray ◽

Uranium Ore ◽

Tes Microcalorimeter ◽

PEMBUATAN NANOKOMPOSIT KITOSAN/TiO2/Ag DAN ANALISIS AKTIVITASNYA SEBAGAI ANTIBAKTERI

CHEMISTRY PROGRESS ◽

10.35799/cp.14.1.2021.34128 ◽

2021 ◽

Vol 14 (1) ◽

Author(s):

Gladys K Bungan ◽

Henry F Aritonang ◽

Audy D Wuntu

Keyword(s):

Escherichia Coli ◽

Staphylococcus Aureus ◽

Electron Microscope ◽

Energy Dispersive ◽

X Ray Diffraction ◽

X Ray ◽

Chitosan Membrane ◽

Ag Particles ◽

Penelitian tentang pembuatan nanokomposit kitosan/TiO2/Ag telah dilakukan dengan menggunakan TiO2sebanyak6 gram dan konsentrasi AgNO3 yaitu 5 mM menggunakan metode reduksi dan impregnasi. Nanokomposit yang dihasilkan dikarakterisasi menggunakan X-Ray diffractometry (XRD), Scanning Electron Microscope-Energy Dispersive x-Ray Spectroscopy (SEM-EDS) dan menganalisis aktivitasnya sebagai anti bakteri terhadap Staphylococcus aureus (Gram positif) dan Escherichia coli (gram negatif). Hasil penelitian menunjukkan bahwa ukuran nanokomposit yang dihasilkan sebesar 56,93 nm. Difraktogram XRD muncul puncak karakteristik partikel TiO2 tetapi partikel Ag kurang terlihat jelas. Namun, berdasarkan data EDS, kedua partikel ini ditemukan pada membran kitosan. Ini menunjukkan bahwa sangat sedikit partikel Ag yang terbentuk atau keterbatasan alat XRD dalam mendeteksi sejumlah kecil partikel. Namun demikian, nanokomposit menunjukkan kemampuannya untuk menghambat pertumbuhan kedua bakteri ini.ABSTRACTResearch on the manufacture of chitosan/TiO2/Ag nanocomposites has been carried out using 6 grams of TiO2 and 5 mM AgNO3 using reduction and impregnation methods.The resulting nanocomposites were characterized using X-Ray diffraction (XRD), Scanning Electron Microscope-Energy Dispersive x-Ray Spectroscopy (SEM-EDS) and analyzed their activity as anti-bacteria against Staphylococcus aureus (Gram positive) and Escherichia coli (gram negative).The results showed that the resulting nanocomposite size was 56.93 nm. The XRD diffractogram showed the peak characteristics of TiO2 particles but the Ag particles were less visible.However, based on EDS data, the two particles were found on the chitosan membrane. This indicates that very few Ag particles are formed or the limitations of XRD devices in detecting a small number of Ag particles.However, the nanocomposites demonstrated their ability to inhibit the growth of these two bacteria.