Microanalysis with the X-ray scanning microscope

1960 ◽  
pp. 267-269 ◽  
Author(s):  
P. Duncumb
Keyword(s):  
Scanning Microscope ◽  
X Ray

scholarly journals Design and performance of an X-ray scanning microscope at the Hard X-ray Nanoprobe beamline of NSLS-II

2017 ◽  
Vol 24 (6) ◽  
pp. 1113-1119 ◽  
Author(s):  
E. Nazaretski ◽  
H. Yan ◽  
K. Lauer ◽  
N. Bouet ◽  
X. Huang ◽  
...  
Keyword(s):  
Material Science ◽  
Phase Contrast ◽  
Heat Dissipation ◽  
Regulation System ◽  
Scanning Microscope ◽  
National Synchrotron Light Source ◽  
X Ray ◽  
Synchrotron Light ◽  
Differential Phase Contrast ◽  
And Performance

A hard X-ray scanning microscope installed at the Hard X-ray Nanoprobe beamline of the National Synchrotron Light Source II has been designed, constructed and commissioned. The microscope relies on a compact, high stiffness, low heat dissipation approach and utilizes two types of nanofocusing optics. It is capable of imaging with ∼15 nm × 15 nm spatial resolution using multilayer Laue lenses and 25 nm × 26 nm resolution using zone plates. Fluorescence, diffraction, absorption, differential phase contrast, ptychography and tomography are available as experimental techniques. The microscope is also equipped with a temperature regulation system which allows the temperature of a sample to be varied in the range between 90 K and 1000 K. The constructed instrument is open for general users and offers its capabilities to the material science, battery research and bioscience communities.

A Study on Nanocrystalline Nickel Parts Prepared by Jet Electrodeposition

2010 ◽  
Vol 37-38 ◽  
pp. 64-67
Author(s):  
Jin Song Chen ◽  
Yin Hui Huang ◽  
Bin Qiao ◽  
Jian Ming Yang ◽  
Yi Qiang He
Keyword(s):  
Dimensional Accuracy ◽  
Processing Parameters ◽  
X Ray Diffraction ◽  
Scanning Microscope ◽  
Nanocrystalline Nickel ◽  
X Ray ◽  
Fine Grained ◽  
Average Grain Size ◽  
Jet Electrodeposition ◽  
Fine Grained Structure

The principles of jet electrodeposition orientated by rapid prototyping were introduced. The nanocrystalline nickel parts with simple shape were fabricated using jet electrodeposition. The microstructure and phase transformation of nanocrystalline nickel were observed under the scanning microscope and X-ray diffraction instrument. The results show that the jet electrodeposition can greatly enhance the limited current density, fine crystalline particles and improve deposition quality. The nickel parts prepared by jet electrodeposition own a fine-grained structure (average grain size 25.6nm) with a smooth surface and high dimensional accuracy under the optimum processing parameters.

scholarly journals Determination of Chromite Sands Suitability for Use in Moulding Sands

2017 ◽  
Vol 17 (2) ◽  
pp. 107-110
Author(s):  
K. Stec ◽  
J. Podwórny ◽  
B. Psiuk ◽  
Ł. Kozakiewicz
Keyword(s):  
Phase Composition ◽  
High Temperature ◽  
Chemical Composition ◽  
Chemical Properties ◽  
Grinding Process ◽  
X Ray Diffraction ◽  
Scanning Microscope ◽  
Spectroscopy Technique ◽  
X Ray

Abstract Using the available analytical methods, including the determination of chemical composition using wavelength-dispersive X-ray fluorescent spectroscopy technique and phase composition determined using X-ray diffraction, microstructural observations in a highresolution scanning microscope equipped with an X-ray microanalysis system as well as determination of characteristic softening and sintering temperatures using high-temperature microscope, the properties of particular chromite sands were defined. For the study has been typed reference sand with chemical properties, physical and thermal, treated as standard, and the sands of the regeneration process and the grinding process. Using these kinds of sand in foundries resulted in the occurrence of the phenomenon of the molding mass sintering. Impurities were identified and causes of sintering of a moulding sand based on chromite sand were characterized. Next, research methods enabling a quick evaluation of chromite sand suitability for use in the preparation of moulding sands were selected.

scholarly journals Study of new formations of C-S-H in manufactured with glass powder as binder mortar

2018 ◽  
Vol 38 (3) ◽  
pp. 24-32 ◽  
Author(s):  
Eva María García del Toro ◽  
María Isabel Más López
Keyword(s):  
Glass Powder ◽  
Soil Stabilization ◽  
X Ray Diffraction ◽  
Scanning Microscope ◽  
X Ray ◽  
Setting Reaction ◽  
External Intervention

Mortar and paste with different composition were analyzed with X-ray diffraction and dispersive energy spectrometry (EDS) with coupled Electronic Scanning Microscope (SEM) to study the formation that appear after the setting reaction in the mortar made by using glass powder, with a size of 16μ, as binder. Such analysis shows the occurrence of formations similar to C-S-H gels, but in which, the Ca/Si ratio is lower than for typical C-S-H gels. In addition it was observed that the shape of the gels is slightly different when the samples are preserved in water. These more filamentous formations and the presence of a larger number of Si molecules causes the setting reaction to be maintained for a longer period of time and provide a certain capacity for self-regeneration without external intervention, which makes it suitable for soil stabilization.

The NPL X-Ray Reflection Scanning Microscope

1992 ◽  
pp. 160-163
Author(s):  
J. Anderson ◽  
T. H. English ◽  
A. Franks ◽  
K. Jackson ◽  
K. Lindsey ◽  
...  
Keyword(s):  
Scanning Microscope ◽  
X Ray

The Influence of the Solutionizing and Ageing on the Structure and Hardness of the ZnAl40Cu3 Alloy

2015 ◽  
Vol 226 ◽  
pp. 91-94
Author(s):  
Rafał Michalik ◽  
Bartosz Chmiela
Keyword(s):  
Heat Treatment ◽  
Tribological Properties ◽  
Construction Material ◽  
Hardness Test ◽  
Al Alloys ◽  
Scanning Microscope ◽  
Plastic Working ◽  
Cast Irons ◽  
X Ray ◽  
Alternative Material

Zn-Al alloys are mainly used due to their tribological properties as an alternative material for bronze, cast irons and aluminum in a bearings and as a construction material. Particular interesting is Zn-40Al-3Cu alloy due to its features. Improvement of the alloy’s features can be obtained by silicon addition, plastic working, heat treatment – solutionizing and ageing. In the article have been shown results of the ZnAl22Cu3 alloy examination as - cast and subjected solutionizing and ageing 385 oC/10h + 175 oC/1h and 385 oC/10h + 175 oC/10h. The scope of examination included: structure testing using scanning microscope, X - ray microanalysis, hardness test. There was found significant decrease of hardness of the tested alloy. Structural examinations have shown that initially in the structure were visible precipitates reach in aluminum and copper. Also were visible precipitates reach in zinc. With increasing time of soaking at 175 oC precipitates reach in aluminum and copper disappeared.

Synthesis and Characterization of Magnetic Nanoparticles using polyvinylpirrolidone as stabilizer

MRS Advances ◽  
2017 ◽  
Vol 2 (49) ◽  
pp. 2769-2773
Author(s):  
Morales P. Patricio ◽  
Moncayo H. José María ◽  
García R. Miguel ◽  
Santoyo S. Jaime
Keyword(s):  
Magnetic Nanoparticles ◽  
X Ray Diffraction ◽  
Scanning Microscope ◽  
X Ray ◽  
Iron Salts ◽  
Transmission Electron ◽  
Vis Spectroscopy ◽  
Coprecipitation Technique ◽  
Electron Scanning Microscope

ABSTRACTMagnetic nanoparticles were obtained by chemical coprecipitation technique from aqueous solutions of iron salts, the synthesis was carried out in an alkaline medium, obtaining magnetic nanoparticles of around 2-10 nm in size. The nanoparticles obtained were stabilized with polyvinylpirrolidone (PVP), the particle size was measured by transmission electron microscopy (TEM), the crystal structure of the magnetic nanoparticles obtained was verified by X-ray diffraction (DRX). The chemical composition of the nanoparticles powder was investigated using electron scanning microscope with energy dispersive X-ray spectroscopy (EDX) equipment. Optical properties as absorption was studied by UV-Vis spectroscopy.

scholarly journals Biological and chemical corrosion of cement materials modified with polymer

2015 ◽  
Vol 63 (3) ◽  
pp. 591-596 ◽  
Author(s):  
E. Stanaszek-Tomal ◽  
M. Fiertak
Keyword(s):  
Sulfuric Acid ◽  
Paracoccus Denitrificans ◽  
Acidithiobacillus Thiooxidans ◽  
Thiobacillus Denitrificans ◽  
Scanning Microscope ◽  
Chemical Corrosion ◽  
X Ray ◽  
Research Results ◽  
Sulphur Bacteria ◽  
Mercury Porosimeter

AbstractThe article presents the effect of the addition of polymer to mortars with CEMI and its influence on durability under conditions of sulfuric acid or nitric and sulphur bacteria or nitrogen (nitrification and denitrification). Both acids corresponds to the products of metabolism of bacteriaAcidithiobacillus thiooxidansandThiobacillus denitrificans,Paracoccus denitrificansby the literature is about 0.15 mmol/dm3. The changes in tightness materials studied by determining moisture mass and absorption. Corrosion processes were identified by examination in a scanning microscope equipped with an X-ray microanalyzer and a mercury porosimeter. The research results presented showed that the solution has a significantly weaker effect on the composite cement and cement-polymer compared with the action of bacteria. The action of both environments caused two opposing processes: unsealing the structure and deposition of corrosion products.

Low Z Elemental Analysis using Energy Loss Electrons in a Scanning Microscope

1973 ◽  
Vol 31 ◽  
pp. 290-291
Author(s):  
D. E. Johnson ◽  
M. Isaacson
Keyword(s):  
Production Efficiency ◽  
Microprobe Analysis ◽  
Electron Microprobe Analysis ◽  
Solid Angle ◽  
Collection Efficiency ◽  
Fluorescence Yield ◽  
X Rays ◽  
Scanning Microscope ◽  
Thin Sections ◽  
X Ray

Electron microprobe analysis has been used increasingly in, recent years for low Z analysis of thin biological sections. Although this technique has produced useful results, the sensitivity is limited by two main factors. First, the fluorescence yield (wK) decreases rapidly with decreasing Z. Using the value of wK (for carbon for example, only about one out of every 400 K ionizations in carbon results in a carbon x-ray. Second, this poor x-ray production efficiency is coupled with the inherently poor x-ray collection efficiency of most microprobe detectors. In thin sections the x-rays are emitted uniformly over 4TT steradians but the detector subtends only a small solid angle at the specimen. Hall estimates the collection efficiency of most diffracting detectors at 10−4 and, with the qualification of much lower peak to background ratios, he estimates the collection efficiency of solid state nondiffractive detectors as 10−4 to 10−2.

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