Magnetic Resonance Imaging of Water Absorption by Highly Porous Ceramic Materials

2019 ◽  
Vol 484 (2) ◽  
pp. 44-47
Author(s):  
E. V. Morozov ◽  
V. M. Buznik ◽  
A. S. Bespalov ◽  
D. V. Grashchenkov
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Water Absorption ◽  
Porous Ceramic ◽  
Ceramic Materials ◽  
Resonance Imaging ◽  
Highly Porous ◽  
Porous Ceramic Materials

scholarly journals Magnetic resonance imaging of water absorption by highly porous ceramic materials

2019 ◽  
Vol 484 (5) ◽  
pp. 563-567
Author(s):  
E. V. Morozov ◽  
V. M. Bouznik ◽  
A. S. Bespalov ◽  
D. V. Graschenkov
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Water Absorption ◽  
Porous Ceramic ◽  
Ceramic Materials ◽  
Imaging Method ◽  
Resonance Imaging ◽  
Oxide Fibres ◽  
Highly Porous ◽  
Porous Ceramic Materials

By using the magnetic resonance imaging method the nontrivial character of water absorption was demonstrated for the first time in highly porous ceramic materials. The effect of hygroscopic memory was found out which is that the preferable concentration of absorbed water in certain areas within the sample persists regardless the subsequent sample wetting history. Coating the oxide fibres with fluorine-containing hydrocarbons in supercritical CO2 in order to hydrophobize the material has been shown to affect substantially the water transport within the sample that can be referred to as an effective approach to protect the porous materials from humid environment. The results obtained demonstrate the advantages of the magnetic resonance imaging in studying the water absorption processes and visualization of water pathways in highly porous ceramic materials.

New heterogeneous catalytic systems based on highly porous ceramic materials modified with immobilized d-metal cage complexes for H2 production from CH4

2019 ◽  
Vol 29 (6) ◽  
pp. 669-671 ◽  
Author(s):  
Alexey G. Dedov ◽  
Yan Z. Voloshin ◽  
Alexander S. Belov ◽  
Alexey S. Loktev ◽  
Alexander S. Bespalov ◽  
...  
Keyword(s):  
Porous Ceramic ◽  
Ceramic Materials ◽  
H2 Production ◽  
Catalytic Systems ◽  
Heterogeneous Catalytic ◽  
Highly Porous ◽  
Porous Ceramic Materials

Void distribution and susceptibility differences in ceramic materials using MRI

1993 ◽  
Vol 8 (3) ◽  
pp. 655-661 ◽  
Author(s):  
Anton S. Wallner ◽  
William M. Ritchey
Keyword(s):  
Porous Ceramic ◽  
Ceramic Materials ◽  
Signal Loss ◽  
Resonance Imaging ◽  
Gradient Echo ◽  
Intensity Measurements ◽  
Magnetic Resonance Imaging Mri ◽  
Processing Differences ◽  
Porous Ceramic Materials ◽  
Solvent Permeation

Magnetic Resonance Imaging (MRI) is applied to porous ceramic materials to study structural properties. In ceramics, processing differences create inhomogeneous binder distribution in the materials which can cause the formation of regions with differing densities and voids. These defects can be observed with MRI using solvent permeation. Fractional porosity obtained by using image intensity measurements and weight gain due to solvent permeation can be correlated. Dark regions in the image are due to defects such as closed voids, pockets of binder, or agglomerates. Defects such as voids or agglomerates usually have different magnetic susceptibilities. This difference causes artifacts in the image. By exploiting the increase in signal loss using a gradient-echo sequence, apparent enhancement of voids in ceramics is achieved.

Magnetic resonance imaging study of water absorption in thermally modified pine wood

Holzforschung ◽  
2015 ◽  
Vol 69 (7) ◽  
pp. 899-907 ◽  
Author(s):  
Muhammad Asadullah Javed ◽  
Päivi M. Kekkonen ◽  
Susanna Ahola ◽  
Ville-Veikko Telkki
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Water Absorption ◽  
Free Water ◽  
Imaging Study ◽  
Gravimetric Analysis ◽  
Resonance Imaging ◽  
Noticeable Effect ◽  
Pine Wood ◽  
Environmentally Friendly Process

AbstractThermal modification is an environmentally friendly process that enhances the lifetime and properties of timber. In this work, the absorption of water in pine wood (Pinus sylvestris) samples, which were modified by the ThermoWood process, was studied by magnetic resonance imaging (MRI) and gravimetric analysis. The modification temperatures were varied between 180°C and 240°C. The data shows that the modification at 240°C and at 230°C decreases the water absorption rate significantly and slightly, respectively, while lower temperatures do not have a noticeable effect. MR images reveal that free water absorption in latewood (LW) is faster than in earlywood (EW), but in the saturated sample, the amount of water is greater in EW. Individual resin channels can be resolved in the high-resolution images, especially in LW regions of the modified samples, and their density was estimated to be (2.7±0.6) mm-2. TheT2relaxation time of water is longer in the modified wood than in the reference samples due to the removal of resin and extractives in the course of the modification process.

scholarly journals Effect of firing mode on the structure and properties of highly porous ceramic materials based on alyumomagnezia spinel

2019 ◽  
pp. 37-42
Author(s):  
N. V. Buchilin ◽  
G. Yu. Lyulyukina ◽  
N. M. Varrik
Keyword(s):  
Heat Treatment ◽  
Mechanical Characteristics ◽  
Porous Ceramic ◽  
Ceramic Materials ◽  
Porous Ceramics ◽  
Preliminary Heat Treatment ◽  
Structure And Properties ◽  
Firing Mode ◽  
Highly Porous ◽  
Porous Ceramic Materials

The results of studies of sintering of spinel porous ceramics using aluminum and magnesium oxides as initial components without sintering additives are presented. It is shown that the optimal burning temperature range for the production of materials with an open-cellular porous structure is 1700‒1730 °C. It has been established that the preliminary heat treatment of oxides significantly affects the mechanical characteristics of materials. Materials were obtained with an interconnected porosity of up to 85 % and a compressive strength of up to 1,0 MPa. Ill. 6. Ref. 25.

scholarly journals Obtaining of dense and highly porous ceramic materials from metallurgical slag

2003 ◽  
Vol 35 (2) ◽  
pp. 85-91 ◽  
Author(s):  
E. Fidancevska ◽  
B. Mangutova ◽  
D. Milosevski ◽  
M. Milosevski ◽  
J. Bossert
Keyword(s):  
Flexural Strength ◽  
Porous Material ◽  
Mass Loss ◽  
Porous Ceramic ◽  
Glass Ceramics ◽  
Ceramic Materials ◽  
Metallurgical Slag ◽  
Porous System ◽  
Highly Porous ◽  
Porous Ceramic Materials

Glass-ceramics in a dense and highly porous form can be obtained from metallurgical slag and waste glass of TV monitors. Using polyurethane foam as pore creator, a highly porous system with porosity of 65 ? 5 %, E-modulus and flexural strength of 8 ? 3 GPa and 13 ? 3.5 MPa respectively can be obtained. This porous material had durability (mass loss) of 0.03 % in 0.1 M HCl that is identical with the durability of a dense composite.

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