Pore and mineral structure of rock using nano-tomographic imaging

2015 ◽  
Vol 1744 ◽  
pp. 235-240 ◽  
Author(s):  
Jukka Kuva ◽  
Mikko Voutilainen ◽  
Antero Lindberg ◽  
Joni Parkkonen ◽  
Marja Siitari-Kauppi ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Three Dimensional ◽  
Potassium Feldspar ◽  
Dimensional Structure ◽  
Good Tool ◽  
X Ray ◽  
Mineral Structure ◽  
Micrometer Scale ◽  
Scanning Electron

ABSTRACTIn order to better understand the micrometer-scale structure of rock and its transport properties which arise from it, seven monomineral samples from two sites (Olkiluoto and Sievi, Finland) were studied with micro- and nanotomography and scanning electron microscopy. From the veined gneiss of Olkiluoto we studied biotite, potassium feldspar, plagioclase (composition of oligoclase) and cordierite, and from Sievi tonalite biotite and two grains of plagioclase (albite). These minerals were the main minerals of these samples. Samples were carefully separated and selected using heavy liquid separation and stereomicroscopy, their three dimensional structure was imaged using X-ray tomography, and their precise mineral composition was determined using scanning electron microscopy and energy-dispersive X-ray spectroscopy (SEM/EDS). The micrometer-scale mineral structure of these samples was observed together with their pores and fissures, and alteration effects were identified whenever applicable. Nanotomography combined with SEM analysis was concluded to be a good tool for analyzing effects of alteration in monomineral samples.

scholarly journals X-Ray Microscopy as an Approach to Increasing Accuracy and Efficiency of Serial Block-Face Imaging for Correlated Light and Electron Microscopy of Biological Specimens

2014 ◽  
Vol 21 (1) ◽  
pp. 231-238 ◽  
Author(s):  
Eric A. Bushong ◽  
Donald D. Johnson ◽  
Keun-Young Kim ◽  
Masako Terada ◽  
Megumi Hatori ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Light And Electron Microscopy ◽  
Three Dimensional ◽  
Microscopy Study ◽  
Electron Microscopic ◽  
Intense Staining ◽  
X Ray ◽  
Block Face ◽  
Scanning Electron

AbstractThe recently developed three-dimensional electron microscopic (EM) method of serial block-face scanning electron microscopy (SBEM) has rapidly established itself as a powerful imaging approach. Volume EM imaging with this scanning electron microscopy (SEM) method requires intense staining of biological specimens with heavy metals to allow sufficient back-scatter electron signal and also to render specimens sufficiently conductive to control charging artifacts. These more extreme heavy metal staining protocols render specimens light opaque and make it much more difficult to track and identify regions of interest (ROIs) for the SBEM imaging process than for a typical thin section transmission electron microscopy correlative light and electron microscopy study. We present a strategy employing X-ray microscopy (XRM) both for tracking ROIs and for increasing the efficiency of the workflow used for typical projects undertaken with SBEM. XRM was found to reveal an impressive level of detail in tissue heavily stained for SBEM imaging, allowing for the identification of tissue landmarks that can be subsequently used to guide data collection in the SEM. Furthermore, specific labeling of individual cells using diaminobenzidine is detectable in XRM volumes. We demonstrate that tungsten carbide particles or upconverting nanophosphor particles can be used as fiducial markers to further increase the precision and efficiency of SBEM imaging.

scholarly journals Synthesis, crystal structure, and thermal properties of poly[aqua(μ5-2,5-dicarboxybenzene-1,4-dicarboxylato)strontium]

2020 ◽  
Vol 76 (3) ◽  
pp. 354-359
Author(s):  
Samia Mokhtari ◽  
Chahrazed Trifa ◽  
Sofiane Bouacida ◽  
Chaouki Boudaren ◽  
Mohammed S.M. Abdelbaky ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Electron Microscopy ◽  
Thermal Analysis ◽  
Three Dimensional ◽  
Dimensional Structure ◽  
Tetracarboxylic Acid ◽  
X Ray Diffraction ◽  
X Ray ◽  
Carboxylate Groups ◽  
Scanning Electron

A coordination polymer formulated as [Sr(H2BTEC)(H2O)] n (H4BTEC = benzene-1,2,4,5-tetracarboxylic acid, C10H6O8), was synthesized hydrothermally and characterized by single-crystal and powder X-ray diffraction, scanning electron microscopy and thermal analysis. Its crystal structure is made up of a zigzag inorganic chain formed by edge-sharing of [SrO8] polyhedra running along [001]. Adjacent chains are connected to each other via the carboxylate groups of the ligand, resulting in a double-layered network extending parallel to (100). O—H...O hydrogen bonds of medium-to-weak strength between the layers consolidate the three-dimensional structure. One of the carboxylic OH functions was found to be disordered over two sets of sites with half-occupancy.

Three-dimensional Structure of a Parameatal Urethral Cyst by Scanning Electron Microscopy

Urology ◽  
2013 ◽  
Vol 81 (5) ◽  
pp. 1072-1074 ◽  
Author(s):  
Nanako Yamada ◽  
Yuichi Yoshida ◽  
Ayako Ito ◽  
Shinichi Morino ◽  
Osamu Yamamoto
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Three Dimensional ◽  
Dimensional Structure ◽  
Three Dimensional Structure ◽  
Scanning Electron

scholarly journals Structure of plant cell nucleus viewed by scanning electron microscopy

2015 ◽  
Vol 43 (1) ◽  
pp. 161-165
Author(s):  
T. J. Wodzicki ◽  
C. L. Brown
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Three Dimensional ◽  
Dimensional Structure ◽  
Pinus Echinata ◽  
Shortleaf Pine ◽  
Nuclear Pores ◽  
Ray Parenchyma ◽  
Ray Parenchyma Cells ◽  
Scanning Electron

The three-dimensional structure of the nucleus ta meristematic and differentiated phloem ray parenchyma cells of shortleaf pine (<i>Pinus echinata</i> Mili.) is viewed by scanning electron microscopy. The fixed and dehydrated plant tissues were freeze-fractured in absolute ethanol and dried by the critical point method. Some of the features observed in the fractured nuclei are aggregates of chromatin some of which possess a spiral orientation, the attachment of chromatin to the nuclear envelope, and small canals in the fractured envelope probably representing nuclear pores.

Three dimensional fine structure of the capillary terminals in the red pulp of the human spleen

1978 ◽  
Vol 36 (2) ◽  
pp. 468-469
Author(s):  
Teruo Suzuki ◽  
Susumu Shimizu ◽  
Yoshiaki Hataba ◽  
Yuji Kirino
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fine Structure ◽  
Three Dimensional ◽  
Dimensional Structure ◽  
Human Spleen ◽  
Perfusion Fixation ◽  
Embedding Medium ◽  
Scanning Electron ◽  
Red Pulp

Introduction In spite of the efforts of many researchers, three dimensional fine structure of the capillary terminals in the red pulp of the spleen has not been successively demonstrated up to date. By stereoscopic scanning electron microscopy of a perfusion-fixed and freeze-fractured dog spleen, we have recently demonstrated that the terminals of the cordal capillaries are obviously open in the cordal labyrinth.Material and Methods In the human spleen, however, applications of the same method only was not necessarily successful to obtain unquestionable informations on their three dimensional structure, since it is very difficult to flush out blood cells thoroughly from the cordal labyrinth at the time of the perfusion fixation. In the present study, a synthetical observation of the capillary terminals in the red pulp of the normal human spleen was undertaken by three ways of; 1) transmission electron microscopy of ultrathin sections (TEM), 2) scanning electron microscopy of freeze-fractured tissue (FF-SEM), and 3) scanning electron microscopy of serial sections from which the embedding medium was removed (SS-SEM).

Application of Scanning Electron Microscopy for observing glomerulus maturation in human kidney

1990 ◽  
Vol 48 (3) ◽  
pp. 534-535
Author(s):  
Toru Hyodo ◽  
Tomonori Naguro ◽  
Toshio Kameie ◽  
Akihiro Iino ◽  
Ikuo Miyagawa
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Present Report ◽  
Three Dimensional ◽  
Morphological Differentiation ◽  
Human Kidney ◽  
Dimensional Structure ◽  
Spontaneous Abortions ◽  
Razor Blade ◽  
Scanning Electron

The ultrastructurg of the mammalian kidney has been explored by many authors, both in adult and fetal animals. As one of the most feasible means to elucidate the complicated three dimensional structure, scanning electron microscopy (SEM) has played an important role in the study of the kidney especially on the morphology of renal glomeruli. So far none of the authors has applied SEM to the human fetus for investigating the development of the glomerulus. In the present report SEM has been used to demonstrate the structure of human fetal metanephric glomeruli with special reference to the morphological differentiation of the podocyte.Materials and Methods: The metanephric kidneys were collected from 4 human fetuses ranging from 11 to 14 weeks of gestation, 2-12 h after death following therapeutic or spontaneous abortions. All specimens were fixed with 2.5% glutaraldehyde in phosphate buffer and cut into small pieces with a razor blade.

Preparation of Nano-Sized Wollastonite Using Calcium Silicate Residue of Potassium Feldspar after Extraction of Potassium and Alumina

2014 ◽  
Vol 633 ◽  
pp. 35-38 ◽  
Author(s):  
Jian Chen ◽  
Jing Yang ◽  
Hong Wen Ma
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Particle Size ◽  
Calcium Silicate ◽  
Potassium Feldspar ◽  
X Ray Diffraction ◽  
X Ray ◽  
Calcined Temperature ◽  
Orientation Growth ◽  
Scanning Electron

In this paper, wollastonite nanopowder were successfully synthesized by the surfactants modified-calcined method using calcium silicate residue of potassium feldspar after extraction of potassium and alumina. The effects of modifier and calcined temperature on the phase composition, morphology and microstructure were studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results showed that the phase of samples with different modifier processing is wollastonite-2M, while CTAB as modifier can avoid preferred orientation growth. The obtained wollastonite powder is spherical in morphology and well dispersed with the particle size of approximately 150nm.

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