Influence of Particles on Cell Structure of Al-Mg Alloys Foamed by Melt Foaming Method

2007 ◽  
Vol 544-545 ◽  
pp. 363-366
Author(s):  
Soo Han Park ◽  
Hwan Goo Seong ◽  
Yeong Hwan Song ◽  
Chang Hwan Seo ◽  
Zulkifli ◽  
...  
Keyword(s):  
Cell Structure ◽  
Surface Structures ◽  
Mg Alloy ◽  
X Ray ◽  
Cell Structures ◽  
Negative Effect ◽  
Oxide Particles ◽  
Al Mg Alloys ◽  
Scanning Electron ◽  
Microstructural Examination

Al-Mg alloy foams containing different Mg contents were synthesized via a conventional melt foaming method. The surface structures of pores formed in resultant foamed alloys was characterized by scanning electron microscopy and x-ray diffractometer. It was found that the pore structures were deteriorated with increasing Mg contents, while the percent porosities did not vary with increasing Mg contents, about 90% and 3~5 mm in pore size. The detailed microstructural examination conducted on increasing Mg containing alloy foams revealed presence of various oxide particles on the surface of individual cells, including MgAl2O4 particles in a form of fine spinel; its small amount for Al-1wt%Mg alloy foam but relative high amount of Al-4wt%Mg one. This suggested the negative effect of MgAl2O4 on the stable pore and thus cell structures in corresponding alloy foams. The possible mechanism associated with MgAl2O4 formation was discussed in the present study.

Synthesis, Structural Characterization and Morphological Studies of Nanocrystalline CdO by Wet-Chemical Method

2018 ◽  
Vol 24 (8) ◽  
pp. 5519-5522
Author(s):  
Israr Ul Hassan ◽  
Liji John ◽  
R. Selwin Joseyphus ◽  
I. Hubert Joe ◽  
R. S Amritha ◽  
...  
Keyword(s):  
Grain Size ◽  
Chemical Method ◽  
Cadmium Oxide ◽  
X Ray Diffraction ◽  
Wet Chemical Method ◽  
X Ray ◽  
Morphological Studies ◽  
Oxide Particles ◽  
Wet Chemical ◽  
Scanning Electron

Synthesis of nanocrystalline cadmium oxide particles were explored by the reaction of inorganic precursor (cadmium chloride) and alkali (sodium hydroxide) via modified wet-chemical method followed by annealing at various temperatures (250, 500 and 750 °C). The structural, optical and morphological studies of cadmium oxide samples were carried out by X-ray diffraction, infrared, ultraviolet-visible, and scanning electron microscope techniques. From X-ray diffraction analysis, it was confirmed that cadmium oxide particles furnish a face centred cubic phase structure and revealing a grain size of around 59 nm. The scanning electron microscope micrographs admit that cadmium oxide samples are agglomerated and have spherical shapes. The bonding deformation and stretching frequency results of cadmium oxide samples were obtained from infrared spectra. The corresponding increase in calcination temperatures has shown an increase in particle size while as no change was found in band gape. These results attribute that the variation in annealing temperature has a significant role on the crystalline nature, grain size and its optical properties. Furthermore, the synthesized cadmium oxide samples were examined for bioactivity analysis.

Corrosion Protection of Mg Alloy by a TiO2 Coating Prepared by Sol-Gel Method

2013 ◽  
Vol 740 ◽  
pp. 473-477
Author(s):  
Yi Zhang ◽  
Cai Li Zhang ◽  
Xiang Meng ◽  
Guo Qin Cao ◽  
Chuan Shuai Li
Keyword(s):  
Orthogonal Experiment ◽  
Sol Gel ◽  
Mg Alloy ◽  
Orthogonal Experiment Design ◽  
Gel Method ◽  
X Ray ◽  
Sol Gel Method ◽  
Az31 Mg Alloy ◽  
Hydrolysis Temperature ◽  
Scanning Electron

TiO2 films were prepared on the AZ31 Mg alloy substrate by sol-gel method. The morphology was characterized via X-ray diffractometer (XRD), scanning electron microscopy (SEM) and energy disperses spectroscopy (EDS). The corrosion rate of the coated AZ31 mg alloy was tested with the method of orthogonal experiment design. The influence of the hydrolysis temperature, coating times, calcinations temperature and time was investigated.

scholarly journals A tube-source X-ray microtomography approach for quantitative 3D microscopy of optically challenging cell-cultured samples

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Ilmari Tamminen ◽  
Kalle Lehto ◽  
Markus Hannula ◽  
Miina Ojansivu ◽  
Laura Johansson ◽  
...  
Keyword(s):  
Tissue Engineering ◽  
Cell Structure ◽  
Large Cell ◽  
Optical Methods ◽  
Cell Nuclei ◽  
Tissue Engineering Scaffolds ◽  
X Ray ◽  
Cell Structures ◽  
X Ray Imaging ◽  
Spatial Coverage

Abstract Development and study of cell-cultured constructs, such as tissue-engineering scaffolds or organ-on-a-chip platforms require a comprehensive, representative view on the cells inside the used materials. However, common characteristics of biomedical materials, for example, in porous, fibrous, rough-surfaced, and composite materials, can severely disturb low-energy imaging. In order to image and quantify cell structures in optically challenging samples, we combined labeling, 3D X-ray imaging, and in silico processing into a methodological pipeline. Cell-structure images were acquired by a tube-source X-ray microtomography device and compared to optical references for assessing the visual and quantitative accuracy. The spatial coverage of the X-ray imaging was demonstrated by investigating stem-cell nuclei inside clinically relevant-sized tissue-engineering scaffolds (5x13 mm) that were difficult to examine with the optical methods. Our results highlight the potential of the readily available X-ray microtomography devices that can be used to thoroughly study relative large cell-cultured samples with microscopic 3D accuracy.

Biomorphous Porous Carbon Prepared from Cotton Stalk

2012 ◽  
Vol 253-255 ◽  
pp. 871-874
Author(s):  
Qing Wang ◽  
Xi Cheng ◽  
Ya Hui Zhang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Weight Loss ◽  
Porous Carbon ◽  
Cotton Stalk ◽  
Pyrolysis Process ◽  
X Ray Diffraction ◽  
X Ray ◽  
Cell Structures ◽  
Scanning Electron

The biomorphic porous carbon was prepared by high temperature pyrolysis at 1000oC. The pyrolysis process of cotton stalk was measured by thermogravimetric analysis (TG). The morphology and microstructure of carbon were characterized by scanning electron microscopy. The phase composition of the resulting sample was analyzed by X-ray diffraction. As compared with the dried cotton stalk, the carbon has an anisotropic shrinkage with 20–40% and about 80% weight loss. The carbon retains the tubular cell structures.

scholarly journals The Presence of Selected Elements in the Microscopic Image of Pine Needles as an Effect of Cement and Lime Pressure within the Region of Białe Zagłębie (Central Europe)

Toxics ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 15
Author(s):  
Mirosław Szwed ◽  
Witold Żukowski ◽  
Rafał Kozłowski
Keyword(s):  
Surface Layer ◽  
Foreign Bodies ◽  
Negative Influence ◽  
Pine Needles ◽  
Microscopic Image ◽  
Energy Dispersion Spectroscopy ◽  
X Ray ◽  
Cell Structures ◽  
Shape Of Particles ◽  
Scanning Electron

In this study, we present the results of microscopic observations of pine needles Pinus sylvestris L. collected in the area of cement-lime pressure in the south-western part of the Świętokrzyskie Mountains in the region of Białe Zagłębie. Images of scanning electron microscopy (SEM) confirm the presence of particles with a size of about 2 to 20 µm on the surface of the needles. Analysis using X-ray energy dispersion spectroscopy (EDS) allowed, in turn, to identify lead, iron, aluminium, calcium, and silicon in particles deposited in the surface layer of assimilation organs and dispersed in the surface layer of vegetation tissue within cell structures. Chemical composition, size and shape of particles of foreign bodies on the needles’ surface allow them to be identified as cement-lime dust coming from production plants located in the Białe Zagłębie. Negative influence on the condition and liveliness of Scots pine in the study area is manifested by images on which stomata is sealed, which limits the possibility of gas exchange.

scholarly journals Integumentary structure and composition in an exceptionally well-preserved hadrosaur (Dinosauria: Ornithischia)

2019 ◽  
Author(s):  
Mauricio Barbi ◽  
Phil R. Bell ◽  
Federico Fanti ◽  
James J. Dynes ◽  
Anezka Kolaceke ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Fossil Record ◽  
Total Thickness ◽  
X Ray ◽  
Terrestrial Vertebrates ◽  
Surrounding Matrix ◽  
Cell Structures ◽  
Synchrotron Radiation Techniques ◽  
Scaly Skin ◽  
Scanning Electron

Preserved labile tissues (e.g. skin, muscle) in the fossil record of terrestrial vertebrates are increasingly becoming recognized as an important source of biological and taphonomic information. Here, we combine a variety of synchrotron radiation techniques with scanning electron and optical microscopes to elucidate the structure of 72 million-year-old squamous (scaly) skin associated with a hadrosaurid dinosaur from the Late Cretaceous of Alberta, Canada. Scanning electron and optical microscopy independently reveal that the three-dimensionally preserved scales are associated with a band of carbon-rich layers up to a total thickness of 75 μm. Compositionally, this band deviates from that of the surrounding matrix; Fourier-transform infrared spectroscopy and soft X-ray spectromicroscopy analyses indicate the presence of carboxylic compounds. The regions corresponding to the integumentary layers are distinctively enriched in iron compared to the associated sedimentary matrix and seem associated to kaolinite. These carbonyl-rich layers are apparently composed of subcircular bodies resembling preserved cell structures. Each of these structures is encapsulated by calcite/vaterite, with iron predominantly concentrated at its center. The presence of iron, calcite/vaterite and kaolinite might have played important roles in the preservation of the layered structures.

Crystal and surface structures of Y2O3 nanoparticles at room temperature

2021 ◽  
pp. 2150371
Author(s):  
R. F. Rzayev
Keyword(s):  
Crystal Structure ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Room Temperature ◽  
Diffraction Method ◽  
Surface Structures ◽  
X Ray Diffraction ◽  
Cubic Symmetry ◽  
X Ray ◽  
Scanning Electron

In this work, the crystal and surface structures of Y2O3 nanoparticles were explored. The exploration of crystal structure was carried out by X-ray diffraction method at room temperature and under normal conditions. It was found that the crystal structure of the Y2O3 compound has a cubic symmetry with an Ia-3 space group. The lattice parameters have the values: [Formula: see text] Å. The surface structure was studied at room temperature and under normal conditions on Scanning Electron Microscope (SEM) microscope. It was found that the nanoparticles of the Y2O3 compound being in the range 20–40 nm are of [Formula: see text] nm size.

On the genesis and composition of natural pyroaurite

Clay Minerals ◽  
1991 ◽  
Vol 26 (3) ◽  
pp. 297-309 ◽  
Author(s):  
R. M. Taylor ◽  
H. C. B. Hansen ◽  
G. Stanger ◽  
C. Bender Koch
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Arid Region ◽  
Sultanate Of Oman ◽  
X Ray Diffraction ◽  
Colour Variation ◽  
X Ray ◽  
Oxide Particles ◽  
Hydrological Environment ◽  
Scanning Electron

AbstractSamples of the mineral pyroaurite, formed from the weathering of partially serpentinised harzburgite (olivine + pyroxene) were found in an arid region of the Sultanate of Oman. These were either golden or silver in colour depending on the horizon from which they were derived. Chemical analysis showed that the colour variation was primarily due to the differing conditions in the hydrological environment. The golden colour was attributed to small Fe(III) oxide particles detected by Mössbauer spectroscopy. In addition, the samples were examined by X-ray diffraction, scanning electron microscopy, and glycerol intercalation. These results were compared with a synthetic pyroaurite sample prepared under conditions (previously reported) similar to those in nature. These conditions are shown to approximate to those found in the hydrological environment in the zones of the natural pyroaurite formation.

Starch and Plant Fiber Reinforced Biodegradable Composites with Open Cell Structures

2019 ◽  
Vol 13 (4) ◽  
pp. 438-445
Author(s):  
Xu Sun ◽  
Jin-Feng Cui ◽  
Xiu-Jie Jia ◽  
Chuan-Wei Zhang ◽  
Fang-Yi Li ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Potato Starch ◽  
Cell Structure ◽  
Hydroxyl Group ◽  
X Ray Diffraction ◽  
Open Cell ◽  
X Ray ◽  
Biodegradable Composites ◽  
Sisal Fibers ◽  
Scanning Electron

In order to figure out the effect of different starches on the properties of starch-based composites, new biodegradable composites with open cell structure were prepared through thermo-cavity foam molding using four different type starches (corn starch (CS), wheat starch (WS), potato starch (PS), and sweet potato starch (SPS)) and sisal fibers as main raw materials. Mechanical properties of the biodegradable composites were tested. The order of tensile and compressive strength of the composites was as follows: SPS-based composite > CS-based composite > PS-based composite > WS-based composite. Following X-ray diffraction, the infrared spectrum analysis, scanning electron microscopy, and viscosity test were employed to gain comprehensive views on the effect of the different starch microstructures on the properties of the biodegradable composites. X-ray diffraction analysis showed that the crystalline index of the SPS and CS were lower than those of PS and WS. Amorphous starch more easily combined with the sisal fiber, which is the deep reason that the SPS-based composite had the best tensile strength. Moreover, the infrared spectrum analysis indicated that SPS molecules demonstrated more hydroxyl groups than the others. The hydroxyl group in the SPS molecules formed more hydrogen bonds with the hydroxyl group in the sisal fibers. Scanning electron microscopy images showed that SPS bonded tightly with sisal fibers uniform open cell structure in the biodegradable composites. The order of the viscosities of the different starch slurry was: WS slurry > PS slurry > CS slurry > SPS slurry. The lower the crystalline index of the starch, the larger the amorphous zone, the lower the viscosity of the starch slurry, and the better the rheological properties are. In this case, the SPS and sisal fibers can combine well, and the SPS-based composites offer improved mechanical properties.

scholarly journals Hydrothermal Synthesis of Leaf-Shaped Ferric Oxide Particles

2009 ◽  
Vol 6 (s1) ◽  
pp. S280-S286
Author(s):  
Keqiang Ding
Keyword(s):  
Ferric Oxide ◽  
Hydrothermal Process ◽  
Potassium Ferricyanide ◽  
X Ray Diffraction ◽  
X Ray ◽  
Oxide Particles ◽  
Ferric Oxides ◽  
Diffraction Patterns ◽  
First Time ◽  
Scanning Electron

For the first time, leaf-shaped ferric oxide particles were prepared from an aqueous solution of potassium ferricyanide [K3Fe(CN)6] by hydrothermal process. Images obtained from SEM (scanning electron microscope) revealed that leaf-shaped ferric oxides (around 1.5 μm in length) were clearly exhibited when the hydrothermal tempreature was 150°C, while as the temperature was increased to 200°C leaf-shaped ferric oxide particles with larger size were observed. XRD (X-ray diffraction) patterns testified that the obtained ferric oxides were α-Fe2O3with well-structured crystal faces. Interestingly, histograms describing the distribution of samples indicated that the distribution of obtained ferric oxide particles did not accord with gaussian distribution

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