A Simple Dissolved Metals Mixing Route to Prepare Nanostructured Mg0.8Zn0.2TiO3 Solid Solution

2015 ◽  
Vol 1112 ◽  
pp. 47-52 ◽  
Author(s):  
Frida Ulfah Ermawati ◽  
Suasmoro Suasmoro ◽  
Suminar Pratapa
Keyword(s):  
Solid Solution ◽  
Particle Size ◽  
Rietveld Analysis ◽  
Dissolved Metals ◽  
Intermediate Phases ◽  
Particle Size Analyzer ◽  
Ft Ir ◽  
Xrd Patterns ◽  
Zn Ions

A study of liquid mixing route to synthesize high purity Mg0.8Zn0.2TiO3 nanopowder, a candidate dielectric ceramics, has been successfully performed. Formation of the phases on the dried powder was studied using TG/DTA, XRD and FT-IR data. Rietveld analysis on the collected XRD patterns confirmed the formation of solid solution in the system. Such solid solution can be obtained from the powder calcined at 500 °C, but calcination at 550 °C gave rise to the most optimum molar purity up to 98.5% without intermediate phases. The role of Zn ions on the formation of solid solution was also discussed. Homogeneity of particle size distribution and nano-crystallinity of the system was verified from the particle size analyzer data, TEM image and the Rietveld analysis output.

Isolasi Dan Karakterisasi Bentonit Alam Menjadi Nanopartikel Monmorillonit

2018 ◽  
Vol 3 (1) ◽  
pp. 12 ◽  
Author(s):  
Zaimahwati Zaimahwati ◽  
Yuniati Yuniati ◽  
Ramzi Jalal ◽  
Syahman Zhafiri ◽  
Yuli Yetri
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Particle Size ◽  
Surface Morphology ◽  
Average Diameter ◽  
Particle Size Analyzer ◽  
Ft Ir ◽  
Scanning Electron ◽  
Sedimentation Processes

<p>Pada penelitian ini telah dilakukan isolasi dan karakterisasi bentonit alam menjadi nanopartikel montmorillonit. Bentonit alam yang digunakan diambil dari desa Blangdalam, Kecamatan Nisam Kabupaten Aceh Utara.  Proses isolasi meliputi proses pelarutan dengan aquades, ultrasonic dan proses sedimentasi. Untuk mengetahui karakterisasi montmorillonit dilakukan uji FT-IR, X-RD dan uji morfologi permukaan dengan Scanning Electron Microscopy (SEM). Partikel size analyzer untuk menganalisis dan menentukan ukuran nanopartikel dari isolasi bentonit alam. Dari hasil penelitian didapat ukuran nanopartikel montmorillonit hasil isolasi dari bentonit alam diperoleh berdiameter rata-rata 82,15 nm.</p><p><em>In this research we have isolated and characterized natural bentonite into montmorillonite nanoparticles. Natural bentonite used was taken from Blangdalam village, Nisam sub-district, North Aceh district. The isolation process includes dissolving process with aquades, ultrasonic and sedimentation processes.  The characterization of montmorillonite, FT-IR, X-RD and surface morphology test by Scanning Electron Microscopy (SEM). Particle size analyzer to analyze and determine the size of nanoparticles from natural bentonite insulation. From the research results obtained the size of montmorillonite nanoparticles isolated from natural bentonite obtained an average diameter of 82.15 nm.</em></p>

scholarly journals Role of chemical substitution in the photoluminescence properties of cerium samarium tungstates Ce(2-x)Smx (WO4)3 (0≤x≤0.3)

2020 ◽  
Vol 225 ◽  
pp. 01013
Author(s):  
K. Derraji ◽  
C. Favotto ◽  
J-C Valmalette ◽  
S. Villain ◽  
J-R. Gavarri ◽  
...  
Keyword(s):  
Solid Solution ◽  
Rietveld Analysis ◽  
Excitation Energies ◽  
Diffraction Profile ◽  
Vacancy Defects ◽  
X Ray ◽  
Cell Parameters ◽  
Structural Distortions ◽  
Ir Emission

In the general framework of the development of materials with tunable photoluminescence, a series of cerium samarium tungstates Ce(2-x)Smx(WO4)3 with x≤0.3 was synthesized by a coprecipitation method followed by thermal treatment at 1000 °C. The polycrystalline compounds were characterized by X-ray diffraction, scanning electron microscopy and photoluminescence experiments. In the present work, the objective would be to determine the role of PL emitting centers in the variations of PL intensities. Firstly, Rietveld analysis showed a decrease of cell parameters and confirmed that a solid solution was obtained. Diffraction profile analyses showed that structural distortions increasing with composition x were observed: they were ascribed to difference in cation sizes of Ce3+ and Sm3+, and to defects generated during crystal growth. The photoluminescence (PL) spectra were obtained under X-Ray (45 kV-35 mA) and UV (364.5 nm) excitations. Two PL emissions of Ce3+ were observed only under UV excitation. Four PL emissions of Sm3+ were observed under UV and X-ray excitations, and their intensities decreased with increasing composition x. Two additional transitions were observed under UV and X-ray excitations: they were attributed to oxygen vacancy defects. In the range 800 to 1000 nm, an increasing IR emission is observed: it was ascribed to emissions due to other oxygen vacancies. The main results are reported in Table 1. The chromaticity diagram (see Figure 1) showed that the colors associated with PL responses vary with Sm composition and excitation energies. This offers the opportunity to develop materials with tunable PL. To better understand this complex behavior, now, we plan to study the solid solution in the composition range x>0.3.

A Study on the Synthesis of SiC Powder from the Silicon Sludge of the Photovoltaic Industry

2012 ◽  
Vol 724 ◽  
pp. 49-52 ◽  
Author(s):  
Woo Teck Kwon ◽  
Soo Ryong Kim ◽  
Y. Kim ◽  
Yoon Joo Lee ◽  
Eun Jin Jung ◽  
...  
Keyword(s):  
Particle Size ◽  
Solar Cell ◽  
Silicon Powder ◽  
Point Of View ◽  
Economic Point ◽  
Heat Treated ◽  
Particle Size Analyzer ◽  
Different Temperatures ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

β-SiC powder was synthesized directly from silicon sludge with carbon black. Large amount of silicon sludge is generated from Solar Cell industry. In an environmental and economic point of view, recycling silicon sludge is important. In this study, two kinds of silicon sludge were characterized using XRD, SEM/EDS and FT-IR. SiC powder was synthesized by the reaction of ball-milled silicon powder for 3h in vacuum at different temperatures (1350 and 1600). Physical properties of the heat treated SiC have been characterized using a SEM, XRD, Particle size analyzer and FT-IR Spectroscopy.

Synthesis and characterization of polyaniline nanomaterials with different molar ratio of monomer

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Priyanka S ◽  
Dhachanamoorth N ◽  
Birundha B
Keyword(s):  
Particle Size ◽  
Initial Conditions ◽  
Oxidative Polymerization ◽  
Molar Ratio ◽  
Synthesis Process ◽  
Chemical Oxidative Polymerization ◽  
Good Tool ◽  
Particle Size Analyzer ◽  
Ft Ir

Formation of polymer nanomaterials are achieved by the process of polymerization and there was an availability of different methods such as chemical oxidative polymerization,electro chemical polymerization, In-situ oxidative polymerization and emulsion polymerization etc., Many monomers combine to form polymers under certain conditions by chemical reactions between the monomers. The chemical oxidative polymerization was most commonly used method to synthesize PANI and the synthesis process involved various molar ratio of aniline (0.1M, 0.2M, 0.3M) in which APS was used as an oxidant with dopant of HCl. This study revealed that the properties changed based on their initial conditions. The prepared aromatic polyaniline was characterized by FT-IR, UV-VIS,Particle size analyzer techniques and anti-bacterial activity of the sample was analyzed.FT-IR spectroscopy gives deep view of many  functional groups that were present in a system by measuring vibrational frequencies of chemical bonds involved. UV-VIS was a good tool to identify, characterize and to study the optical properties of nanomaterials.In particle size analyzer, the size of a particle was measured using the instrument laser diffraction particle size analyzer (SALD-2300). The synthesized polyaniline had the tendency to resist the growth of both gram positive and gram negative bacteria. These organic conducting polymers were sometimes called “smart polymers” and have varies application in medical, OLED, solar cell, batteries and sensor etc.,

Synthesis of Calcium Metaphosphates Fine Powders by Chemical Precipitation Methods

2010 ◽  
Vol 105-106 ◽  
pp. 532-535 ◽  
Author(s):  
Yin Zhang ◽  
De Shuang Kong ◽  
Ya Qiu Tao ◽  
Jian Ping Zhu ◽  
Neng Jian Yao
Keyword(s):  
Particle Size ◽  
Chemical Precipitation ◽  
Precipitation Method ◽  
Fine Powders ◽  
Heat Treated ◽  
Particle Size Analyzer ◽  
Powder Characteristics ◽  
Ft Ir ◽  
Phosphorus Precursor ◽  
Hydrolysis Of

Calcium metaphosphate (CMP) fine powders were produced by a chemical precipitation method. In order to produce the powders, CMP was prepared by the mixing of two precursors, such as calcium oxide (CaO) and phosphate acid (H3PO4). Sparingly soluble chemicals, the Ca/P ratio of the mixture was set to be 0.50 to produce stoichiometric CMP, were chemical agitated in phosphate acid solution. At least 3 hours of pre-hydrolysis of phosphorus precursor were required to obtain CMP phase. The CMP powders were dried in a drying oven at 60°C for 72 hours and then heat-treated at various temperatures at a ramp of 1°C /min in air for various hours. The obtained powder was analyzed using XRD, XRF, FT-IR, SEM, TG-DTA, Zeta Potential Meter, Specific Surface Area, and Particle Size Analyzer. The results showed that obtained CMP powders have a significantly powder characteristics.

Characterization of Well-Dispersed CeO2 Nanoparticles Prepared by a New Method of Reverse Microemulsion

2011 ◽  
Vol 194-196 ◽  
pp. 781-784
Author(s):  
Fa Mei Feng ◽  
Jia Qing Xie ◽  
Li Ke Zou ◽  
Bin Xie
Keyword(s):  
Particle Size ◽  
Fourier Transform ◽  
Ceo2 Nanoparticles ◽  
Size Distributions ◽  
X Ray ◽  
Transmission Electron ◽  
Particle Size Analyzer ◽  
Ft Ir ◽  
Cubic Structure

Well-dispersed CeO2 nanoparticles were successfully prepared in a simple system composed of sodium bis (2-ethylhexyl) sulfosuccinate (AOT)- octane-water (W/O) microemulsion in this paper. The morphology and microstructure of the products were characterized by the laser particle size analyzer, Fourier transform infrared spectroscopy (FT-IR), X-ray diffractometer (XRD), differential scanning calorimeter (DSC) and transmission electron microscope (TEM). It was found that the CeO2nanoparticles obtained from this method have well-proportioned size distributions; the surfactant (AOT) molecule was adsorbed on the surface of CeO2nanoparticles precursor, which is favorable for the dispersion of CeO2nanoparticles; the CeO2nanoparticles calcined was a crystal of the cubic structure. In addition, the mechanism on the formation of the CeO2nanoparticles was also proposed in this paper.

scholarly journals KARAKTERISASI FISIKOKIMIA NANOKRISTAL EKSTRAK HERBA SELEDRI ( Apium graveolens L.) DENGAN PERBEDAAN KONSENTRASI POLOXAMER188

2020 ◽  
Vol 4 (1) ◽  
pp. 31-39
Author(s):  
Henni Rosaini ◽  
Rina Wahyuni ◽  
Boyke Panata Sinaga ◽  
Wahyu Margi Sidoretno
Keyword(s):  
Particle Size ◽  
Apium Graveolens ◽  
Poloxamer 188 ◽  
Marker Compound ◽  
Biopharmaceutics Classification System Class ◽  
Particle Size Analyzer ◽  
Ft Ir ◽  
Low Solubility ◽  
Grinding Time

Celery (Apium graveolens L) is a plant of Apiaceae family which contains flavonoids, saponins, tannins, essential oils, apiin, apigenin, choline, asparagine, vitamin A, B, C. Apigenin contained in celery included in the BCS (Biopharmaceutics Classification System)  class II, which has low solubility and high permeability drugs. One method for increasing solubility is the nanocrystal method. Where the purpose of this study was to see the effect of differences in the concentration of poloxamer 188 on the characterization of nanocrystal. The results of the particle size analyzer (PSA) showed particle size distribution in formula 1 the concentration of poloxamer 188 40% 6 hour grinding time of 1648.5 nm with a potential zeta value of -11.2. While the formula 2 concentration of poloxamer 188 50% and formula 3 the concentration of poloxamer 188 60% with a 5 hour grinding time of 1049.6 and 1483.2 with a potential zeta value of -12.5 and -8.9. From the FT-IR analysis shows the presence of clusters in formulas 1, 2, and 3 which are not found in apigenin which is a celery marker compound, on the contrary there are groups on apigenin which are not found in formulas 1, 2, and 3.

scholarly journals β-hexanitrohexaazaisowurtzitane Particles Prepared by Spray Drying and its Characterization

2021 ◽  
Vol 27 (1) ◽  
pp. 119-124
Author(s):  
Wenzheng XU ◽  
Hao LI ◽  
Xin LIANG ◽  
Jie WANG ◽  
Jinyu PENG ◽  
...  
Keyword(s):  
Particle Size ◽  
Spray Drying ◽  
Ultrafine Particles ◽  
Average Particle Size ◽  
Narrow Particle Size Distribution ◽  
Average Particle ◽  
Thermal Stimulus ◽  
Particle Size Analyzer ◽  
Xrd Patterns ◽  
The Impact

In this paper, the ultrafine β-hexanitrohexaazaisowurtzitane (β – CL – 20) particles were prepared by spray drying method. The CL – 20 samples were characterized by scanning electron microscope (SEM), particle size analyzer, X-ray diffraction (XRD), and Differential Scanning Calorimeter (DSC). Furthermore, the safety properties of samples under impact and thermal stimulus were tested and analyzed. The results of SEM showed that the average particle size of ultrafine CL – 20 particles with a narrow particle size distribution, were about 320 nm, and the shape was elliptical. The XRD patterns indicated that the polymorphic phase of ultrafine particles was mainly β-type. Compared with that of raw CL – 20, the impact sensitivity of the ultrafine CL – 20 had been decreased significantly, for the drop height (H50) was increased from 13.0 to 33.5 cm. The critical explosion temperature of the ultrafine CL – 20 decreased from 232.16 ℃ to 227.93 ℃, indicating that the thermal stability of the ultrafine CL – 20 is lower than that of raw CL – 20.

scholarly journals Preparation of PAN Spinning Solution with Fine Dispersion of Cellulose Microparticles

2015 ◽  
Vol 2015 ◽  
pp. 1-8
Author(s):  
Jee-Woo Yang ◽  
Jong Sung Won ◽  
Da Young Jin ◽  
Ji Eun Lee ◽  
Won Ho Park ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Particle Size ◽  
Carbon Fiber ◽  
Physical Method ◽  
Heat Treating ◽  
Optimum Conditions ◽  
Pan Fiber ◽  
Particle Size Analyzer ◽  
Milling Method ◽  
Ft Ir

This study suggested the optimum conditions for the stable dispersion of cellulose microparticles in PAN spinning dope, which was prepared for spinning the fiber. Many research studies have investigated methods for preparing a variety of carbon fiber precursors in an attempt to control their characteristics according to the applications. In order to prepare PAN fiber that contains fine cellulose particles, it is important to create a uniformly dispersed spinning dope. Minimization of the cellulose particle size was subjected to heat treatment at various temperatures in order to reduce the cohesive force from the hydrogen bonds between the cellulose molecules. Carbonized cellulose microparticles were obtained for efficient dispersion using the physical method and the sedimentation method. Several instrumental analyses were conducted to study the characteristics of the particles and solutions with SEM, FT-IR, XRD, and a particle size analyzer. From the results, the dispersion of the PAN spinning dope with a chemical treatment was superior to the milling method followed by heat treatment. In this study, heat-treating cellulose microparticles at 400°C was found to be the most effective method.

scholarly journals Hydrothermal Synthesis of High Crystalline Silicalite from Rice Husk Ash

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
Chaiwat Kongmanklang ◽  
Kunwadee Rangsriwatananon
Keyword(s):  
Particle Size ◽  
Hydrothermal Synthesis ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Research Work ◽  
Crystallization Time ◽  
Silica Source ◽  
Ft Ir ◽  
Size And Morphology ◽  
Xrd Patterns

The objective of this research work was to evaluate the hydrothermal synthesis of silicalite with high crystallinity within a small particle size. The current study focused on investigating the effects of silica sources such as rice husk ash (RHA) and silica gel (SG), crystallization time, and ratios of NaOH/SiO2, H2O/NaOH, and SiO2/TPABr. The crystallinity, particle size, and morphology were characterized by FT-IR, XRD, particle size analyser, and SEM. The conclusion of the main findings indicated that the XRD patterns of these samples clearly showed a pure phase of MFI structure corresponding to FT-IR spectra with vibration mode at 550 and 1223 cm−1. The highest crystallinity was obtained at reaction time only 6 hours with the mole ratios of NaOH/SiO2, H2O/NaOH and SiO2/TPABr as 0.24, 155, and 30, respectively. When SG was used as a silica source, it was found that the particle size was smaller than that from RHA. The morphologies of all silicalite samples were coffin and cubic-like shape.

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