Morphological evaluation of heterogeneous oolitic limestone under pressure and fluid flow using X-ray microtomography

2018 ◽  
Vol 150 ◽  
pp. 172-181 ◽  
Author(s):  
Yihuai Zhang ◽  
Maxim Lebedev ◽  
Ahmed Al-Yaseri ◽  
Hongyan Yu ◽  
Lezorgia N. Nwidee ◽  
...  
Keyword(s):  
Fluid Flow ◽  
X Ray ◽  
Oolitic Limestone ◽  
Morphological Evaluation

Application of Cross-correlation Analysis Method for Measurement of the Fluid Flow Rate Based on X-ray Radiation

2019 ◽  
Vol 11 (1) ◽  
pp. 01025-1-01025-5 ◽  
Author(s):  
N. A. Borodulya ◽  
◽  
R. O. Rezaev ◽  
S. G. Chistyakov ◽  
E. I. Smirnova ◽  
...  
Keyword(s):  
Fluid Flow ◽  
Correlation Analysis ◽  
Flow Rate ◽  
Cross Correlation ◽  
Fluid Flow Rate ◽  
Analysis Method ◽  
X Ray ◽  
Cross Correlation Analysis ◽  
Correlation Analysis Method

scholarly journals An Insight into Chemistry and Structure of Colloidal 2D-WS2 Nanoflakes: Combined XPS and XRD Study

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1969
Author(s):  
Riccardo Scarfiello ◽  
Elisabetta Mazzotta ◽  
Davide Altamura ◽  
Concetta Nobile ◽  
Rosanna Mastria ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Xrd Analysis ◽  
Crystal Habit ◽  
Phase Identification ◽  
X Ray Diffraction ◽  
X Ray ◽  
Morphological Evaluation ◽  
Rational Understanding ◽  
Structural Inspection

The surface and structural characterization techniques of three atom-thick bi-dimensional 2D-WS2 colloidal nanocrystals cross the limit of bulk investigation, offering the possibility of simultaneous phase identification, structural-to-morphological evaluation, and surface chemical description. In the present study, we report a rational understanding based on X-ray photoelectron spectroscopy (XPS) and structural inspection of two kinds of dimensionally controllable 2D-WS2 colloidal nanoflakes (NFLs) generated with a surfactant assisted non-hydrolytic route. The qualitative and quantitative determination of 1T’ and 2H phases based on W 4f XPS signal components, together with the presence of two kinds of sulfur ions, S22− and S2−, based on S 2p signal and related to the formation of WS2 and WOxSy in a mixed oxygen-sulfur environment, are carefully reported and discussed for both nanocrystals breeds. The XPS results are used as an input for detailed X-ray Diffraction (XRD) analysis allowing for a clear discrimination of NFLs crystal habit, and an estimation of the exact number of atomic monolayers composing the 2D-WS2 nanocrystalline samples.

scholarly journals Morphological evaluation of silicone/clay slurries by small-angle/wide-angle x-ray scattering

2007 ◽  
Vol 18 (4) ◽  
pp. 765-773 ◽  
Author(s):  
Manuela L. Q. A. Kaneko ◽  
Íris L. Torriani ◽  
Inez V. P. Yoshida
Keyword(s):  
Small Angle ◽  
Wide Angle ◽  
X Ray ◽  
Morphological Evaluation ◽  
X Ray Scattering ◽  
Ray Scattering

Influence of Separator Thickness on the Performance of Electric Double Layer Supercapacitors in Aqueous Electrolyte

2020 ◽  
Vol 1012 ◽  
pp. 109-113
Author(s):  
D.V. Silva ◽  
G.S. Galdino ◽  
Lusinete Pereira Barbosa ◽  
J.C.S. Casini ◽  
R.N. Faria
Keyword(s):  
Electric Double Layer ◽  
Room Temperature ◽  
Aqueous Electrolyte ◽  
Carbon Electrodes ◽  
Galvanostatic Charge ◽  
Homogeneous Microstructure ◽  
X Ray ◽  
Morphological Evaluation ◽  
Charge Discharge ◽  
Discharge Curves

The effects of the separator thickness (δ) upon the equivalent series resistances (ESR) and specific capacitances (Cs) of supercapacitors electrodes have been investigated using commercially available porous filter paper (δ=150 μm, pores size=7.5 μm, 80 gm-2). Commercial activated carbon electrodes immersed in 1molL-1 KOH electrolyte (25°C) have been employed in this study. The specific capacitances were calculated from cyclic voltammetry curves at room temperature employing various scan rates (5, 10, 15 and 30 mVs-1). Internal series resistances of the supercapacitors were measured using the galvanostatic charge discharge curves also at room temperature. A maximum of 28 separators (δ=4200 μm) have been employed in this investigation. It has been shown that the ESR increases substantially with separator thickness (from 3.1 to 7.9 Ωcm2). The specific capacitance decreased somewhat with increasing separator thickness and scan rates (from 64 to 52 Fg-1; at 5 mVs-1). The microstructures of the electrode material have been investigated using scanning electron microscopy (SEM) and chemical microanalyses employing energy dispersive X-ray analysis (EDX). A compositional and morphological evaluation of these electrodes showed a very homogeneous microstructure.

Improvements in the X-Ray Saturation Technique of Studying Fluid Flow

1950 ◽  
Vol 2 (07) ◽  
pp. 183-194 ◽  
Author(s):  
F. Morgan ◽  
J.M. McDowell ◽  
E.C. Doty
Keyword(s):  
Fluid Flow ◽  
X Ray

scholarly journals X-ray Doppler Velocimetry: An imaging diagnostic of 3D fluid flow in turbulent plasma

2017 ◽  
Vol 23 ◽  
pp. 184-187 ◽  
Author(s):  
J.A. Koch ◽  
J.E. Field ◽  
J.D. Kilkenny ◽  
E. Harding ◽  
G.A. Rochau ◽  
...  
Keyword(s):  
Fluid Flow ◽  
Turbulent Plasma ◽  
Doppler Velocimetry ◽  
X Ray

scholarly journals Electrospun Structural Hybrids of Acyclovir-Polyacrylonitrile at Acyclovir for Modifying Drug Release

Polymers ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 4286
Author(s):  
He Lv ◽  
Shiri Guo ◽  
Gaoyi Zhang ◽  
Wanli He ◽  
Yonghui Wu ◽  
...  
Keyword(s):  
Fluid Flow ◽  
Drug Release ◽  
Composite Nanofibers ◽  
Order Kinetic ◽  
X Ray Diffraction ◽  
X Ray ◽  
Sheath Fluid ◽  
Initial Release ◽  
Blending Process ◽  
Release Profiles

In traditional pharmaceutics, drug–crystalline nanoparticles and drug–polymer composites are frequently explored for their ability to modify drug release profiles. In this study, a novel sort of hybrid with a coating of acyclovir crystalline nanoparticles on acyclovir-polyacrylonitrile composites was fabricated using modified, coaxial electrospinning processes. The developed acyclovir-polyacrylonitrile at the acyclovir nanohybrids was loaded with various amounts of acyclovir, which could be realized simply by adjusting the sheath fluid flow rates. Compared with the electrospun composite nanofibers from a single-fluid blending process, the nanohybrids showed advantages of modifying the acyclovir release profiles in the following aspects: (1) the initial release amount was more accurately and intentionally controlled; (2) the later sustained release was nearer to a zero-order kinetic process; and (3) the release amounts at different stages could be easily allocated by the sheath fluid flow rate. X-ray diffraction results verified that the acyclovir nanoparticles were in a crystalline state, and Fourier-transform infrared spectra verified that the drug acyclovir and the polymer polyacrylonitrile had a good compatibility. The protocols reported here could pave the way for developing new types of functional nanostructures.

X-Rays for Fluid Flow Inspection

2004 ◽  
Author(s):  
D. Chambellan ◽  
O. Gal ◽  
S. Legoupil ◽  
A. Vabre
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Specific Gravity ◽  
Void Fraction ◽  
X Rays ◽  
Optical Technique ◽  
X Ray ◽  
Non Destructive Evaluation ◽  
Intensive Use ◽  
Non Destructive

X-rays techniques are widely used in the non-destructive evaluation field for mechanical inspection. However, development of new x-ray detectors and sources over the last decade has let to an intensive use of this technique in other fields. In this paper, we describe the use of X-rays techniques in the field of fluid flow engineering (fluidics and heat transfer). This technique is very attractive since measurements can be performed even if pressure, temperature require the use of opaque walls. In addition the X-ray technique is well suited to multiphase flows where optical technique can not be used if void fraction is larger than few percents. Specific gravity, mass or void fraction are the main accessible parameters.

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