scholarly journals Influence of Processing Type in the Morphology of Membranes Obtained from PA6/MMT Nanocomposites

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Rodholfo da Silva Barbosa Ferreira ◽  
Caio Henrique do Ó Pereira ◽  
Rene Anisio da Paz ◽  
Amanda Melissa Damião Leite ◽  
Edcleide Maria Araújo ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Screw Extruder ◽  
X Ray ◽  
Membrane Morphology ◽  
Twin Screw ◽  
Microscopy Images ◽  
Scanning Electron

The nanocomposites have an extensive use in the current process of membrane preparation, taking into account their unique features as membranes. Thus, the study of nanocomposite processing to obtain membranes is highly important. In this work, Brazilian clay was used (Brasgel PA) for the preparation of polyamide/clay nanocomposite. The nanocomposites were produced in a high rotation homogenizer and in a twin screw extruder. From the nanocomposites and pure polymers processed in the two equipments, membranes were prepared by the immersion-precipitation method, using formic acid as solvent. By X-ray diffraction (XRD), the formation of exfoliated and/or partially exfoliated structures with changes in the crystalline phases of the polyamide was observed. From scanning electron microscopy images, it was observed that the processing clearly influenced the membrane morphology.

scholarly journals A Novel Strong Cyan Luminescence Emission of Tb2O3 Particles

2021 ◽  
Author(s):  
Fatma Unal
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Ammonium Carbonate ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Terbium Oxide ◽  
X Ray ◽  
Ft Ir ◽  
Pl Emission ◽  
Scanning Electron

Abstract Terbium oxide (Tb2O3) particles (NPs) were synthesized by precipitation method using ammonium carbonate as precipitation agent. Effects of precursor molarity (0.1, 0.15 and 0.2 M) on photoluminescence (PL) behaviour of the NPs were investigated. The presence of the Tb2O3 phase was confirmed by X-Ray Diffraction (XRD) and Fourier-transform infrared spectroscopy (FT-IR) analyses. Morphological investigations of the produced powders were made by Field Emission Gun-Scanning Electron Microscopy (FEG-SEM). It showed that the morphology of Tb2O3 particles transformed from the nanograin chain to bundles morphology of rod-like as the amount of precursor molarity increased. Emission spectrum were investigated by Photoluminescence (PL) Spectroscopy. All the Tb2O3 particles exhibited the strongest peak at 493 nm ascribed to 5D4-7F6 (magnetic dipole (MD), C2) transition. The increase in the number of C2 sites released from the MD transition with the increase of the precursor molarity caused a negative increase in the b* (yellowness/blueness of the emission) value in the CIE diagram, indicating that the colour shifted to the blue region. The Tb2O3 particles produced by the precipitation method exhibited novel strong cyan colour and the PL emission intensity increased with increasing molarity.

Effect of EDTA on the Morphology and Size of SrCO3 Particles during Crystallization

2010 ◽  
Vol 148-149 ◽  
pp. 1551-1555
Author(s):  
Yan Hong Zhao ◽  
Qing Yue Jia ◽  
You Gao ◽  
Xiao Jing Wang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Acetic Acid ◽  
Spherical Shape ◽  
Strontium Carbonate ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Structure And Morphology ◽  
Scanning Electron

Strontium carbonate particles with different morphologies and sizes were synthesized successfully by a precipitation method in the presence of ethylenediaminetetra-acetic acid disodium (abbreviate as EDTA) at 25 . The phase structure and morphology of these SrCO3 particles were studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. The XRD results showed that orthorhombic crystalline SrCO3 particles were prepared in the absence of and presence of EDTA. It was found that this additive played an important role in controlling the morphology and size of the particles, which changed from dendritic to spherical shape as EDTA was added.

A Novel Porous Ferromagnetic Glass-Ceramic for Hyperthermia Application

2013 ◽  
Vol 454 ◽  
pp. 288-291 ◽  
Author(s):  
Jian An Liu ◽  
Mei Mei Zhang ◽  
Xue Na Yang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Saturation Magnetization ◽  
Glass Ceramic ◽  
Magnetic Measurements ◽  
Magnetic Behavior ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

A novel porous ferromagnetic glass-ceramic has been synthesized with glassceramic and hydroxyapatite for hyperthermia application. The glassceramic was obtained from a melt derived glass, and the hydroxyapatite was prepared via precipitation method with biological template (YEAST). Both components of such a mixture were sintered at 1000 °C for 1 hour in graphite. The sample was characterized by x-ray diffraction, scanning electron microscopy and magnetic measurements. This material exhibited magnetic behavior and porosity. The results show that porous ferromagnetic glass-ceramic, which saturation magnetization (Ms) of about 25 A·m2/kg and diameter of porous 30-50μm, was obtained.

Intergrowth of several solid phases from the Y–Ni–B–C system in a large YNi2B2C crystal

2008 ◽  
Vol 41 (4) ◽  
pp. 738-746 ◽  
Author(s):  
Torsten Weissbach ◽  
Tilmann Leisegang ◽  
Andreas Kreyssig ◽  
Matthias Frontzek ◽  
Jens-Uwe Hoffmann ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
X Ray Diffraction ◽  
Orientation Relation ◽  
X Ray ◽  
Polished Cross Section ◽  
Diffraction Patterns ◽  
The Individual ◽  
Microscopy Images ◽  
Scanning Electron

A YNi2B2C single crystal containing traces of foreign phases was inspected by means of neutron and X-ray diffraction as well as scanning electron microscopy and X-ray spectroscopy methods. The diffraction patterns obtained from the experiments look similar to those expected for a superstructure. Nevertheless, they can be interpreted as crystallographically oriented precipitations of YB2C2and Ni2B within the YNi2B2C crystal, formed during the cooling process. The orientation relation between the lattices was obtained from experimental neutron and X-ray data. Structure refinements of the collected X-ray data were performed by separation of the intensity data of the individual phases. Scanning electron microscopy images of the inclusions found on a polished cross section of the crystal are presented; their chemical composition was determined using wavelength-dispersive X-ray analysis.

Effect of screw configuration on the dispersion of nanofillers in thermoset polymers

2017 ◽  
Vol 37 (8) ◽  
pp. 815-825 ◽  
Author(s):  
Gangadhar Angadi ◽  
Hebbale NarayanaRao Narasimha Murthy ◽  
Sridhar Ramakrishna ◽  
Salim Firdosh ◽  
Raghavendra Nagappa ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
X Ray Diffraction ◽  
Screw Extruder ◽  
X Ray ◽  
Right Hand ◽  
Uniform Dispersion ◽  
Twin Screw ◽  
Thermoset Polymers ◽  
Scanning Electron ◽  
Better Than

Abstract This paper deals with the study of screw configuration for dispersing nanofillers in thermoset polymers using an intermesh co-rotating twin screw extruder. The influence of kneading elements on the dispersion of nanoclay in epoxy was examined using 10 different screw configurations. Nanoclay was dispersed in epoxy at a barrel temperature of 5°C and a screw speed of 100 rpm. The combination of right hand kneading block and three/four lobed kneading blocks resulted in uniform dispersion of nanofiller. Positive staggered angle with right hand kneading elements yielded uniform dispersion of the nanofiller. Mechanical properties of epoxy nanocomposites processed with these configurations were better than those of neat epoxy. Excessive shear was associated with four lobed kneading block (4KB)/4KB configuration and hence degradation of polymers leading to shorter chains, whereas inadequate shearing in neutral kneading block (NKB)/NKB configuration led to agglomerations. These observations were evidenced by scanning electron microscopy (SEM) and X-ray diffraction (XRD).

scholarly journals Method for preventing air pollution: Methane oxidation by two types of catalysts

2014 ◽  
Vol 25 (1) ◽  
pp. 43-46
Author(s):  
Cristina Ileana Covaliu ◽  
Gina Alina Traistaru ◽  
Gigel Paraschiv
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Air Pollution ◽  
Methane Oxidation ◽  
Sol Gel ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Co Precipitation ◽  
Scanning Electron

Abstract Methane oxidation using different catalysts is an useful process for preventing air pollution. This study presents the methane oxidation by two types of catalysts: Pd-Sn/Al2O3 and spinel mixed oxide, CuFe2O4. The Pd-Sn/Al2O3 was successfully prepared by sol-gel method and CuFe2O4 by co-precipitation method. The catalysts obtained have been characterized structurally, morphologically and texturally by X-ray diffraction (XRD), scanning electron microscopy (SEM) and specific surface area (BET). The catalytic activity tests regarding methane oxidation were also performed.

Performance of Polypropylene Composites Filled by Calcium Carbonate Whiskers

2011 ◽  
Vol 399-401 ◽  
pp. 415-418
Author(s):  
Qiu Ju Sun ◽  
Gui Zhen Zhao ◽  
Shi Gang Xin ◽  
Shi Wei Wu ◽  
Jie Lu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Calcium Carbonate ◽  
Sodium Stearate ◽  
X Ray Diffraction ◽  
Screw Extruder ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Polypropylene Composites ◽  
Twin Screw ◽  
Scanning Electron

Calcium carbonate (CaCO3) whiskers were firstly treated by sodium stearate, and then blended with polypropylene (PP) to prepare the composites by a closely intermeshing co-rotating twin-screw extruder at 200°C. The performance of the composites, such as thermal behavior, microstructure and mechanical properties, were analyzed with differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), X-ray diffraction (XRD), scanning electron microscopy (SEM) and mechanical testing. The results showed that CaCO3 whisker influenced the crystalline behavior of PP phase in the blends because of its intervening. Moreover, thermo-decomposing temperature, tensile and bending strengths of the blends all increased with increasing whisker content. CaCO3 whiskers had good reinforcing and toughening effects on PP.

scholarly journals Effect of Zinc Oxide nanoparticals preparation from Zinc Sulphate (ZnSo4) against gram negative or gram positive microorganisms in vitro

2018 ◽  
Vol 42 (1) ◽  
pp. 18-22
Author(s):  
Khitam S. S
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Zinc Oxide ◽  
Morphological Changes ◽  
X Ray Diffraction ◽  
Zno Nps ◽  
X Ray ◽  
Microscopy Images ◽  
Scanning Electron

     This research aims to prepare ZnO NPs by using chemical bath deposition way from ZnSO4 and NaOH as starting materials. It was examined by X-ray diffraction, Scanning Electron Microscopy, Zeta potential and Fourier Transformation Infrared. Scanning Electron Microscopy images showed various morphological changes of ZnO nanoparticles obtained by the above method and the different magnification Scanning Electron Microscopy images of the nanoparticle and confirms that the Nano flowers are grown with well-defined morphology and diameters varying between 60-110 nm. The effect of Zinc oxide nanoparticles against bacteria staphylococcus aureus, E.coli and Pseudomous aeruginosa showed the ability of this substance to inhibit the growth of all types of bacteria in different concentrations. The percentage of survival bacteria was (2, 3.7 and 6%) for E.coli bacteria and (1, 1.5 and 5 %) for Pseudomous aeruginosa bacteria, while the percentage was (0.8, 1 and 1.5 %) for staphylococcus aurous respectively for all concentration.

scholarly journals Growth of Semimetals Bismuth and Antimony Films on Reactive Substrate

2015 ◽  
Vol 2015 ◽  
pp. 1-5
Author(s):  
Xiao Wang ◽  
Xiaoxing Wei ◽  
Caixia Song
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Growth Process ◽  
Hierarchical Structures ◽  
Xrd Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Hierarchical Microspheres ◽  
Microscopy Images ◽  
Scanning Electron

Semimetal Bi and Sb thin films with novel hierarchical structures were synthesized on zinc substrate via a hydrothermal method. X-ray diffraction (XRD) analysis confirmed the formation of pure semimetals Bi and Sb. Scanning electron microscopy images showed that Bi films constructed with microtube arrays and hierarchical microspheres can be obtained selectively by altering the concentration of Bi3+ions. The synthesized Sb films were constructed with bowl-shaped particles. The growth process of these semimetal architectures was briefly discussed.

Synthesis of LiFePO4 Cathode Materials by a Chemical Method

2011 ◽  
Vol 675-677 ◽  
pp. 57-60
Author(s):  
Yuan Sun ◽  
Xiu Juan Zhao ◽  
Rui Ming Ren
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Chemical Method ◽  
Single Phase ◽  
Raw Materials ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Co Precipitation ◽  
Scanning Electron

The olivine-type LiFePO4 powder was prepared by a chemical method using the synthesized FePO4⋅2H2O, LiOH and glucose as raw materials. The synthesized FePO4⋅2H2O powder was obtained by co-precipitation method. FePO4⋅2H2O and LiFePO4 powders were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results showed the synthesized FePO4⋅2H2O powder at pH of 2.05 was in a single phase and nearly spherical in shape. Using the synthesized powders to prepared LiFePO4 at 600 °C in vacuum for 2 h was nearly spherical in shape and whose size was in the range of 0.1-0.5μm.

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