scholarly journals Nanocomposites Fe/Activated Carbon/PVA for Microwave Absorber: Synthesis and Characterization

2018 ◽  
Vol 2018 ◽  
pp. 1-6 ◽  
Author(s):  
Bualkar Abdullah ◽  
Sultan Ilyas ◽  
Dahlang Tahir
Keyword(s):  
Fourier Transform ◽  
Activated Carbon ◽  
Polyvinyl Alcohol ◽  
Chemical Bond ◽  
Reflection Loss ◽  
Synthesis And Characterization ◽  
Network Analyzer ◽  
X Ray Diffraction ◽  
X Ray ◽  
Maximum Reflection Loss

Nanocomposites, activated carbon/polyvinyl alcohol (AC/PVA) filled with Fe to form Fe/AC/PVA, were characterized by using X-ray fluorescence (XRF), X-ray diffraction (XRD), Fourier transform infrared (FTIR), and vector network analyzer (VNA). The crystal orientations from Fe are (104), (110), and (200) and the bonding formations of AC are O-H, C-H, and C=C show existence in nanocomposites, which may be due to the Fe that has been filled the pore of AC via a chemical bond. 20% AC (3 mm in thickness) in nanocomposites shows higher performance absorption for C-band (4.65 GHz) with maximum reflection loss of −32.5 dB.

Synthesis and Characterization of Polyvinyl Alcohol/Zinc Hydroxide Composite

2016 ◽  
Vol 701 ◽  
pp. 307-311
Author(s):  
Umma Habiba ◽  
Amalina Muhammad Afifi ◽  
Bee Chin Ang
Keyword(s):  
Fourier Transform ◽  
Polyvinyl Alcohol ◽  
Electron Spectroscopy ◽  
Synthesis And Characterization ◽  
Zinc Hydroxide ◽  
Film Casting ◽  
X Ray Diffraction ◽  
Casting Method ◽  
X Ray

In this study, Polyvinyl Alcohol /Zinc Hidroxide composite was synthesised via film casting method. Fourier transform infrared and X-Ray diffraction was undertaken to analyze the interaction between polyvinyl alcohol and zinc hydroxide.Morphology of the resulting PVA/Zn(OH)2 composite structure was observed by Field Emission Scannig Electron Spectroscopy. FTIR and XRD results showed interaction between PVA and zinc hydroxide. These interaction are responsible for change in the thermal behavior of the composite.

scholarly journals Structural properties and bonding characteristics of honeycomb structure of composite ZnMnO2 and activated carbon

2019 ◽  
Vol 17 (1) ◽  
pp. 228080001882018 ◽  
Author(s):  
Bualkar Abdullah ◽  
An Nisyah ◽  
Sultan Ilyas ◽  
Dahlang Tahir
Keyword(s):  
Activated Carbon ◽  
Structural Properties ◽  
Reflection Loss ◽  
Average Crystallite Size ◽  
Honeycomb Structure ◽  
Wave Number ◽  
Network Analyzer ◽  
X Ray Diffraction ◽  
X Ray ◽  
Bonding Characteristics

Structural properties and chemical bonding of new composites (ZnMnO2 and activated carbon) with honeycomb structure have been studied by using X-ray diffraction and Fourier transform infrared. The composition of the powder of ZnMnO2 has been studied by X-ray fluorescence in waste derived from a conventional battery. X-ray diffraction data show that the average crystallite size and the dislocation density for the composite are 90.17 nm and 12.30 × 1013 m−2, respectively. The C–O and C=O bonding for composites seen shifted to the lower wave number of pure ZnMnO2 and activated carbon indicated size reduction as an effect of Zn or Mn in the site of activated carbon. In addition, the reflection loss was analyzed by vector network analyzer and shows reflection loss of about −21.72 dB, the frequency range being 4.40–4.59 GHz for a thickness of 6 nm. The honeycomb structure of composite ZnMnO2–AC in this study promises new types of composite materials for various applications.

Prepared and Microwave-Absorption Properties of BN Coated Ni Nanocapsules

2010 ◽  
Vol 663-665 ◽  
pp. 1252-1255 ◽  
Author(s):  
Gui Mei Shi ◽  
Shu Lian ◽  
Ge Song ◽  
Jin Bing Zhang
Keyword(s):  
Reflection Loss ◽  
Electromagnetic Properties ◽  
Mechanochemical Reaction ◽  
Network Analyzer ◽  
Absorber Thickness ◽  
X Ray Diffraction ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
X Ray ◽  
Transmission Electron

BN coated Ni nanocapsules were prepared by arc evaporating Ni-B amorphous alloy powders synthesized by a mechanochemical reaction, and their microstructure, surface component as well as electromagnetic properties (2-18 GHz) were investigated by means of high-resolution transmission electron microscopy, X-ray diffraction , photoluminescence spectra (PL) and a network analyzer, respectively. The reflection loss R (dB) of the nanocapsules less than -20 dB was obtained in the frequency range of 4.3-18 GHz for an absorber thickness of 1.4-6 mm. An optimal reflection loss of -32.0 dB was reached at 13 GHz with an absorber thickness of 2 mm. The microwave absorptive mechanisms of BN-coated Ni nanocapsule absorbent were discussed.

Synthesis and Characterization of Y2O3 Nanoflowers

2012 ◽  
Vol 465 ◽  
pp. 76-79 ◽  
Author(s):  
Shuang Zhan ◽  
Xia Li
Keyword(s):  
Fourier Transform ◽  
Phase Composition ◽  
Electron Microscope ◽  
Synthesis And Characterization ◽  
The Novel ◽  
X Ray Diffraction ◽  
Facile Hydrothermal Method ◽  
X Ray ◽  
Scanning Electron

The novel Y2O3 nanoflowers were synthesized through a facile hydrothermal method without using any catalyst or template. The phase composition and the microstructure of as-prepared products were characterized by field emission scanning electron microscope (FE-SEM), X-ray diffraction (XRD) as well as Fourier transform infrared spectrum. The formation mechanism for the Y2O3 flowers has been proposed.

scholarly journals Analysis of Activated Carbon Monolith Derived from Carrot Juice Waste for Supercapacitor Electrode Application

2021 ◽  
Vol 10 (2) ◽  
pp. 26-31
Author(s):  
Dewi Ramayani ◽  
Yanuar Hamzah ◽  
Erman Taer ◽  
Novi Yanti ◽  
Afriwandi Apriwandi
Keyword(s):  
Cyclic Voltammetry ◽  
Fourier Transform ◽  
Activated Carbon ◽  
Energy Storage ◽  
Electrode Materials ◽  
Fourier Transform Infrared ◽  
Carrot Juice ◽  
X Ray Diffraction ◽  
X Ray ◽  
One Stage

Abstrak. Pengembangan sistem penyimpanan energi elektrokimia yang efektif dan efisien menjadi sangat penting pada era evolusi teknologi dan industri modern saat ini. Penelitian ini mengemukakan karbon aktif sebagai bahan dasar material elektroda untuk diaplikasikan pada piranti penyimpan energi, khsusunya superkapasitor melalui analisa densitas, X-ray diffraction (XRD), Fourier Transform Infrared (FTIR) dan Cyclic Voltammetry (CV). Karbon aktif berbentuk monolit disiapkan dari ampas jus wortel melalui pendekatan pirolisis satu tahap terintegrasi dan aktivasi kimia KOH. Proses pirolisis satu tahap terintegrasi dilakukan melalui penggabungan karbonisasi dan aktivasi fisika dalam atmosfer gas N2/CO2. Berdasarkan analisis data, karbon aktif menunjukkan sifat amorf yang normal dan sifat porositas terkonfirmasi. Lebih lanjut, sifat elekrokimia dievaluasi menggunakan metode Cyclic Voltammetry (CV) pada sistem dua elektroda. Kapasitansi spesifik yang dihasilkan sebesar 155 F/g dalam elektrolit 1 M H2SO4 dengan energi spesifik dan daya spesifik adalah 21,52 Wh/kg dan 77,57 W/kg. Berdasarkan analisa ini maka ampas jus wortel terkonfirmasi berpotensi sebagai karbon aktif untuk elektroda yang diaplikasikan dalam piranti penyimpan energi superkapasitor.Abstract. The development of an effective and efficient electrochemical energy storage system is very important in today's era of technological evolution and the modern industry. This research suggests that activated carbon is the raw material for electrode materials to be applied to energy storage devices, especially supercapacitors through density analysis, X-ray diffraction (XRD), Fourier Transform Infrared (FTIR), and Cyclic Voltammetry (CV). Activated carbon in the monolith form derived from carrot juice waste was prepared through a one-stage integrated pyrolysis approach and chemical activation of KOH. An integrated one-stage pyrolysis process was carried out by combining carbonization and physical activation in an N2/CO2 gas atmosphere. Based on data analysis, activated carbon performed normal amorphous behavior with confirmed porosity features. Furthermore, the electrochemical properties were evaluated using the Cyclic Voltammetry (CV) method at the two-electrode system. The specific capacitance was found as high as 155 F/g in the 1 M H2SO4 aqueous electrolyte with specific energy and specific power as high as 21.52 Wh/kg and 77.57 W/kg, respectively. Based on this analysis, the carrot juice waste has been confirmed to have the potential as activated carbon for the electrodes applied in supercapacitor energy storage technology.Keywords: Carrot Juice Waste, Activated Carbon, Electrode Materials, Supercapacitor

scholarly journals Synthesis and characterization of antibacterial magnetite-activated carbon nanoparticles

2019 ◽  
Vol 44 (1-2) ◽  
pp. 80-87
Author(s):  
Roonak Golabiazar ◽  
Zagros A Omar ◽  
Rekar N Ahmad ◽  
Shano A Hasan ◽  
S Mohammad Sajadi
Keyword(s):  
Electron Microscopy ◽  
Fourier Transform ◽  
Activated Carbon ◽  
Carbon Nanoparticles ◽  
Fourier Transform Infrared ◽  
Average Particle ◽  
X Ray Diffraction ◽  
X Ray ◽  
Morphological Studies ◽  
Vis Spectroscopy

Magnetite iron oxide nanoparticles synthesized using the co-precipitation methods were further functionalized with activated carbon. The magnetite-activated carbon nanoparticles were characterized by scanning electron microscopy equipped with energy dispersive X-ray spectroscopy, transmission electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, and UV-Vis spectroscopy. X-ray diffraction and Fourier transform infrared confirmed the functionalization of the Fe3O4 nanoparticles with the activated carbon. The X-ray diffraction studies demonstrate that magnetite-activated carbon nanoparticles were indexed into the spinel cubic lattice with a lattice parameter of 0.833 nm and an average particle size of about 14 nm. Various parameters such as dislocation density, microstrain, and surface morphological studies were calculated. However, this work implicated the use of magnetite-activated carbon nanoparticles in antibacterial studies. Further, the antibacterial effect of magnetite-activated carbon nanoparticles was evaluated against three pathogenic bacteria, which showed that the nanoparticles have moderate antibacterial activity against both Gram-positive ( Staphylococcus aureus) and Gram-negative ( Proteus mirabilis and Pseudomonas aureginosa) pathogenic bacterial strains in the presence of different magnetite-activated carbon nanoparticle concentrations at room temperature.

Synthesis and Characterization of NiO Doped SnO2 Nano-Flowers

2013 ◽  
Vol 575-576 ◽  
pp. 58-60
Author(s):  
Wei Ping Tang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fourier Transform ◽  
Infrared Spectrum ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
Hydrothermal Route ◽  
X Ray ◽  
Scanning Electron

In this present work, a new method for preparing NiO doped SnO2 nanoflowers by hydrothermal route is suggested. The composition and microstructure of samples were characterized by field emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD) and Fourier transform infrared spectrum (FTIR). Moreover, a possible formation mechanism was discussed.

Synthesis and Characterization of Chitosan Based Ultraviolet Absorber with Groups of Benzophenone

2011 ◽  
Vol 295-297 ◽  
pp. 388-391
Author(s):  
Shu Juan Yu ◽  
Chun Qun Liang
Keyword(s):  
Fourier Transform ◽  
Moisture Absorption ◽  
Glycidyl Ether ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Absorption Area ◽  
Ft Ir ◽  
Ultraviolet Absorbers

2-hydroxy-4-glycidyl ether benzophenone(HGEBP) is synthesized with 2,4-dihydoxy- benzophenone(UV-0) and epichlorohydrin(ECH) as starting material, then a series of chitosan (CS) based novel ultraviolet absorbers (CS-g-UV-0) are synthesized by the reaction of chitosan with HGEBP in isopropylcarbinol in the presence of sodium hydroxide. The products(CS-g-UV-0) are characterized by means of Fourier transform infrared spectra (FT-IR), X-ray diffraction (XRD), and UV spectrophotometer. The results of UV absorption show that anyone of the grafted products has a strong ultraviolet absorption area ranging from 280nm to 350nm and the maximum absorption peak presents at 291 nm. It is found that the grafted products could improve the moisture-absorption and moisture-retention property with the increase of G% values.

scholarly journals ANALISIS STRUKTUR KRISTAL DAN SIFAT MAGNET BAHAN ABSORBER Ni(0,5-x)NdxFe2,5O4 HASIL SINTESIS DENGAN METODE KOPRESIPITASI

2018 ◽  
Vol 12 (1) ◽  
pp. 25-32 ◽  
Author(s):  
Yunasfi Yunasfi
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Reflection Loss ◽  
Vector Network Analyzer ◽  
Network Analyzer ◽  
Vibrating Sample Magnetometer ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

Telah dilakukan analisis struktur mikro dan sifat magnet bahan penyerap gelombang mikro Ni(0,5-x)NdxFe2,5O4 hasil sintesis dengan dengan metode kopresipitasi. Serbuk Ni(0,5-x)NdxFe2,5O4 (x = 0,0; 0,2 dan 0,4) disintesis dengan mencampurkan serbuk NiCl2, NdCl3 danFeCl3 sesuai dengan perbandingan molnya masing-masing. Identifikasi fasa dengan XRD (X-ray diffraction) menunjukkan telah terbentuknya komposit  Ni(0,5-x)NdxFe2,5O4 dengan munculnya fasa NiFe2O4, NdFeO3 dan Fe2O3. Pengamatan morfologi dengan SEM (Scanning Electron Microscope) menunjukkan terbentuknya butiran yang tidak homogen dengan ukuran antara 100 nm – 200 nm. Sifat magnet sampel yang dianalisis dengan VSM (vibrating sample magnetometer) menunjukkan bahwa sampel berperilaku ferromagnetik, nilai Ms semakin rendah (pada rentang 36,6 – 21,8 emu/g) sedangakan nilai Hc semakin besar (pada rentang 140,5 – 191,5 Oe) seiring dengan penambahan kandungan ion Nd3+. Sedangkan kemampuan penyerapan gelombang mikro yang diukur dengan VNA (Vector Network Analyzer) menunjukkan nilai RL (reflection loss) maksimum oleh sampel x = 0,2 sekitar -24 dB pada frekuensi 10,60 GHz. Berarti bahwa serbuk Ni(0,3)Nd0,2Fe2,5O4 mampu menyerap gelombang mikro sebesar ~94 % pada frekuensi 10,60 GHz.  

Synthesis and Characterization of Novel Organomodified Nanoclays for Application in Dental Materials

2019 ◽  
Vol >15 (5) ◽  
pp. 512-524 ◽  
Author(s):  
Alexandros K. Nikolaidis ◽  
Elisabeth A. Koulaouzidou ◽  
Dimitris S. Achilias
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Thermogravimetric Analysis ◽  
Fourier Transform Infrared Spectroscopy ◽  
Quaternary Ammonium ◽  
Fourier Transform Infrared ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
X Ray

Background: Nanoclays incorporated in dental resins have been previously investigated. However, limited reports are associated with nanoclays that exhibit high functionality. Objective: The aim of this study was the targeted synthesis and characterization of organomodified nanoclays with methacrylic groups suitable for incorporation in dental nanocomposite resins. Methods: Quaternary ammonium methacrylates were synthesized and characterized by means of proton nuclear magnetic resonance and Fourier-transform infrared spectroscopy. Consequently, they were inserted into the interlayer space of nanoclay through a cation exchange reaction, while silane was also used for simultaneous surface modification. The produced organomodified nanoclays were characterized by means of X-ray diffraction, Fourier-transform infrared spectroscopy and thermogravimetric analysis. Results: Fourier-transform infrared spectra confirmed the successful synthesis of the quaternary ammonium methacrylates. X-ray diffraction analysis showed that organoclays exhibited higher d001- values (up to 1.78 nm) compared to raw nanoclay (1.37 nm), indicating an accomplished intercalation in each case. X-ray diffraction spectra mainly disclosed the presence of methacrylic functional groups in all nanoclays. Thermogravimetric analysis curves verified the different thermal stability of organoclays due to the diversity of their organic modifiers. Conclusion: The experimental results showed that nanoclay was successfully modified with ammonium methacrylates and silane. Τhe combination of X-ray diffraction and thermogravimetric analysis data revealed a high degree of intercalation and methacrylated organic loading as well. These phenomena may favor a good dispersion and high polymerization degree of nanoclays with dental resin monomers, rendering them potentially useful materials for the development of advanced dental nanocomposites resins.

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