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

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Gladys K Bungan ◽  
Henry F Aritonang ◽  
Audy D Wuntu
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Energy Dispersive ◽  
X Ray Diffraction ◽  
X Ray ◽  
Chitosan Membrane ◽  
Ag Particles ◽  
Scanning Electron

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.

scholarly journals SINTESIS KOMPOSIT KITOSAN/MgO/Ag DAN ANALISIS EFEKTIVITASNYA SEBAGAI ANTIBAKTERI

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Shintya Maryani ◽  
Henry F Aritonang ◽  
Vanda S Kamu
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Coprecipitation Method ◽  
Gram Positive ◽  
Gram Negative ◽  
X Ray ◽  
Ag Particles ◽  
Scanning Electron

Penelitian tentang sintesis komposit kitosan/MgO/Ag dengan variasi massa prekursor AgNO3 0,05 g, 0,1 g, 0,15 g dan 0,2 g disintesis dengan metode kopresipitasi. Komposit yang dihasilkan dikarakterisasi menggunakan X-Ray Diffractometry (XRD) dan Scanning Electron Microscope (SEM). Selanjutnya, keefektifan komposit ini sebagai antibakteri diuji yaitu Staphylococcus aureus (Gram positif) dan Escherichia coli (Gram negatif). Hasil penelitian menunjukkan bahwa puncak karakteristik partikel MgO dan Ag tidak muncul pada difraktogram XRD, tetapi secara visual dan morfologis SEM mendukung pembentukan dua partikel dan berdasarkan literatur dari hasil peneliti lain. Selain itu, komposit ini efektif dalam menghambat pertumbuhan kedua bakteri.       ABSTRACT Research on the synthesis of chitosan/MgO/Ag composites with variations in the mass of AgNO3 precursors 0.05 g, 0.1 g, 0.15 g and 0.2 g were synthesized by the coprecipitation method. The resulting composites were characterized using X-Ray Diffractometry (XRD) and Scanning Electron Microscope (SEM). Furthermore, the effectiveness of this composite as an antibacterial was tested, namely Staphylococcus aureus (Gram positive) and Escherichia coli (Gram negative). The results showed that the characteristic peaks of MgO and Ag particles did not appear on the XRD diffractogram, but visually and morphologically SEM supported the formation of two particles and based on the literature from the results of other researchers. In addition, this composite is effective in inhibiting the growth of both bacteria.

scholarly journals Karakterisasi Membran ZSM-5 yang Disintensis dengan Variasi Jenis dan Ukuran Kasa Penyangga

2020 ◽  
Vol 16 (1) ◽  
pp. 1
Author(s):  
Ana Hidayati Mukaromah ◽  
Tulus Ariyadi ◽  
Inas Hasna Azizah ◽  
Mifbakhuddin Mifbakhuddin
Keyword(s):  
Fourier Transform ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Energy Dispersive Spectroscopy ◽  
Energy Dispersive ◽  
X Ray Diffraction ◽  
X Ray ◽  
Aisi 316 ◽  
Scanning Electron

<p>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 (<em>coating)</em> pada penyangga kasa yang telah diberi perlakuan dan dipanaskan pada suhu 90 °C selama 4 hari. Selanjutnya, membran yang dihasilkan dikarakterisasi engan metoda <em>X-ray diffraction</em> (XRD), <em>scanning electron microscope-energy dispersive spectroscopy</em> (SEM-EDS) dan <em>Fourier-transform infrared</em> (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<sup>-</sup><sup>1</sup>yang merupakan ciri khas membran ZSM-5.</p><p class="Text"><strong>Characterization of ZSM-5 Membranes Synthesized by Variation of Support Types and Sizes.</strong> 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<sup>-1</sup> which is a characteristic of ZSM-5 membranes.</p>

scholarly journals Electrochemical Fabrication of Niobium Silicon Alloys from Oxide Powder Mixtures

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Fanke Meng ◽  
Huimin Lu
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Oxide Powder ◽  
Energy Dispersive ◽  
X Ray Diffraction ◽  
Silicon Alloys ◽  
Powder Mixtures ◽  
X Ray ◽  
Electrochemical Fabrication ◽  
Scanning Electron

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.

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

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Shohei Yamaguchi ◽  
Tomohiro Iida ◽  
Kazunori Matsui
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Porous Alumina ◽  
Energy Dispersive ◽  
X Ray Diffraction ◽  
X Ray ◽  
Anodic Porous Alumina ◽  
Microscope Images ◽  
Green Photoluminescence ◽  
Scanning Electron

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.

scholarly journals 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

2019 ◽  
pp. 54-61
Keyword(s):  
Electron Microscope ◽  
Technology Transfer ◽  
Scanning Electron Microscope ◽  
Energy Dispersive Spectroscopy ◽  
Energy Dispersive ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

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 Continuity of the technique of manufacturing molds for casting silver at the Center Andean Area, from Precolumbian times Luisa Vetter Parodi Museo Nacional Sicán; Programa de Estudios Andinos-PUCP Av. Manuel Villarán 192, Dpto. 302, Urbanización Aurora, Miraflores DOI: https://doi.org/10.33017/RevECIPeru2011.0010/ RESUMEN En la época precolombina, los orfebres del área centro andina manejaban distintas técnicas de vaciado para elaborar piezas de metal. Una de estas técnicas era el vaciado en moldes bivalvos elaborados en arcilla y con temperantes orgánicos. Esta misma técnica de elaboración de moldes la podemos apreciar hoy en día en San Pablo de Canchis, donde los plateros cusqueños elaboran sus piezas vaciadas de plata en moldes elaborados con técnicas muy parecidas a la de los orfebres precolombinos. Para poder determinar si hubo transferencia de tecnología entre los orfebres precolombinos y los sanpablinos, hemos analizado moldes procedentes del cementerio inca de Rinconada Alta en La Molina en Lima y moldes de San Pablo de Canchis por microscopia electrónica de barrido con espectroscopia de energía dispersa (MEB-EED), fluorescencia de rayos X (FRX) y difracción de rayos X (DRX). Descriptores: Plata, moldes, vaciado, época precolombina, San Pablo de Canchis, arqueometría. ABSTRACT In Precolumbian times, silversmiths used different casting techniques to make their metal works. One of them was casting with bivalve molds made with clay and organic temper. The same technique can be seen nowadays at San Pablo de Canchis, where Cuzco silversmiths made their works with similar techniques to those of Precolumbian times. In order to determine if there was a technology transfer between Precolumbian silversmiths and San Pablo's, we have analized molds from the Inca cemetery of Rinconada Alta, La Molina, in Lima, and also molds from San Plablo de Canchis, using scanning electron microscope and energy dispersive spectroscopy (SEM-EDAX), X ray fluorescence (XRF) and X ray diffraction (XRD). Keywords: Silver, molds, casting, Precolumbian times, San Pablo de Canchis, archeometry.

PHAX-SCAN: Functional integration of a Scanning Electron Microscope and an energy-dispersive x-ray analyser

1989 ◽  
Vol 47 ◽  
pp. 56-57
Author(s):  
Marc H. Peeters ◽  
Max T. Otten
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
High Speed ◽  
High Performance ◽  
Functional Integration ◽  
Energy Dispersive ◽  
X Rays ◽  
X Ray ◽  
High Speed Analysis ◽  
Scanning Electron

Over the past decades, the combination of energy-dispersive analysis of X-rays and scanning electron microscopy has proved to be a powerful tool for fast and reliable elemental characterization of a large variety of specimens. The technique has evolved rapidly from a purely qualitative characterization method to a reliable quantitative way of analysis. In the last 5 years, an increasing need for automation is observed, whereby energy-dispersive analysers control the beam and stage movement of the scanning electron microscope in order to collect digital X-ray images and perform unattended point analysis over multiple locations.The Philips High-speed Analysis of X-rays system (PHAX-Scan) makes use of the high performance dual-processor structure of the EDAX PV9900 analyser and the databus structure of the Philips series 500 scanning electron microscope to provide a highly automated, user-friendly and extremely fast microanalysis system. The software that runs on the hardware described above was specifically designed to provide the ultimate attainable speed on the system.

PENGGUNAAN TiO2 PARTIKEL NANO HASIL SINTESIS BERBASIS AIR MENGGUNAKAN METODA SOL-GEL PADA BAHAN KAPAS SEBAGAI APLIKASI UNTUK TEKSTIL ANTI UV

Arena Tekstil ◽  
2013 ◽  
Vol 28 (1) ◽  
Author(s):  
Maya Komalasari ◽  
Bambang Sunendar
Keyword(s):  
Fourier Transform ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Sol Gel ◽  
Crosslinking Agent ◽  
X Ray Diffraction ◽  
Nano Tio2 ◽  
X Ray ◽  
Infra Red ◽  
Scanning Electron

Partikel nano TiO2 berbasis air dengan pH basa telah berhasil disintesis dengan menggunakan metode sol-gel dan diimobilisasi pada kain kapas dengan menggunakan kitosan sebagai zat pengikat silang. Sintesis dilakukan  dengan prekursor TiCl4 pada konsentrasi 0,3 M, 0,5 M dan 1 M, dan menggunakan templat kanji dengan proses kalsinasi pada suhu 500˚C selama 2 jam. Partikel nano TiO2 diaplikasikan ke kain kapas dengan metoda pad-dry-cure dan menggunakan kitosan sebagai crosslinking agent. Berdasarkan hasil Scanning Electron Microscope (SEM),diketahui bahwa morfologi partikel TiO2 berbentuk spherical dengan ukuran nano (kurang dari 100 nm). Karakterisasi X-Ray Diffraction (XRD) menunjukkan adanya tiga tipe struktur kristal utama, yaitu (100), (101) dan (102) dengan fasa kristal yang terbentuk adalah anatase dan rutile. Pada karakterisasi menggunakan SEM terhadap serbuk dari TiO2 yang telah diaplikasikan ke permukaan kain kapas, terlihat adanya imobilisasi partikel nano TiO2 melalui ikatan hidrogen silang dengan kitosan pada kain kapas. Hasil analisa tersebut kemudian dikonfirmasi dengan FTIR (Fourier Transform Infra Red) yang hasilnya memperlihatkan puncak serapan pada bilangan gelombang 3495 cm-1, 2546 cm-1, dan 511 cm-1,  yang masing-masing diasumsikan sebagai adanya vibrasi gugus fungsi O-H, N-H dan Ti-O-Ti. Hasil SEM menunjukkan pula bahwa kristal nano yang terbentuk diantaranya adalah fasa rutile , yang berdasarkan literatur terbukti dapatberfungsi sebagai anti UV.

scholarly journals Characterizing Severely Plastically Deformed Materials Using Transmission Kikuchi Diffraction and Energy Dispersive X-ray Spectroscopy in the Scanning Electron Microscope

2013 ◽  
Vol 19 (S2) ◽  
pp. 692-693
Author(s):  
P. Trimby
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Energy Dispersive ◽  
X Ray ◽  
Scanning Electron

Extended abstract of a paper presented at Microscopy and Microanalysis 2013 in Indianapolis, Indiana, USA, August 4 – August 8, 2013.

Effect of the Neodymium Content on Mechanical Properties of the Electro-Brush Plated Nano-Al2O3/Ni Composite Coating

2012 ◽  
Vol 525-526 ◽  
pp. 277-280
Author(s):  
Guo Jin ◽  
Xiu Fang Cui ◽  
Er Bao Liu ◽  
Qing Fen Li
Keyword(s):  
Mechanical Properties ◽  
Rare Earth ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Composite Coating ◽  
Nanoindentation Test ◽  
X Ray Diffraction ◽  
X Ray ◽  
Small Cracks ◽  
Scanning Electron

The effect of the neodymium content on mechanical properties of the electro-brush plated nanoAl2O3/Ni composite coating was investigated in this paper. The microstructure and phase structure were studied with scanning electron microscope (SEM) and X-ray diffraction (XRD). The hardness and abrasion properties of several coatings with different neodymium content were studied by nanoindentation test and friction / wear experiment. Results show that the coatings are much finer and more compact when the neodymium was added, and the hardness and abrasion property of the coatings with neodymium were improved obviously. Besides, the small cracks conduced by the upgrowth stress in the coatings were ameliorated when the rare earth neodymium was added. The improvement mechanism was further discussed.

Effect of Briquetting Pressure on the Performance of In Situ Formed Sialon in Al2O3-C Refractory Bricks

2014 ◽  
Vol 881-883 ◽  
pp. 1049-1052 ◽  
Author(s):  
Nai Peng ◽  
Cheng Ji Deng ◽  
Hong Xi Zhu
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
X Ray Diffraction ◽  
X Ray ◽  
Z Value ◽  
Refractory Bricks ◽  
Scanning Electron

In this paper, the effects of briquetting pressure on the performance of in-situ formed Sialon in Al2O3-C refractory bricks are investigated. The phase compositions and microstructure of the Al2O3-C refractory were investigated by X-ray diffraction (XRD) and scanning electron microscope (SEM).The results show the briquetting pressure hardly has effect on the phase of the sintered specimens, two new phases of Sialon with a Z value of 2 and SiC formed. The micrographs of Sialon crystals have the shape of both column and tabular column, but with a cone tip in the specimens sintered at 200MPa and 300MPa and smooth tip in specimens sintered at 400MPa and 500MPa.

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