Mach-Zehnder interferometry investigations in drying of water-saturated porous materials

2019 ◽  
Vol 125 (18) ◽  
pp. 184901
Author(s):  
Anuradha Bhatia ◽  
Norbert Roth ◽  
Bernhard Weigand
Keyword(s):  
Porous Materials ◽  
Water Saturated

Poroelastic Analysis of Partial Freezing in Cohesive Porous Materials

2013 ◽  
Vol 80 (2) ◽  
Author(s):  
Teddy Fen-Chong ◽  
Antonin Fabbri ◽  
Mickaël Thiery ◽  
Patrick Dangla
Keyword(s):  
Porous Materials ◽  
Cement Paste ◽  
A Priori ◽  
Frost Damage ◽  
Mechanical Effect ◽  
Thermal Shrinkage ◽  
Hardened Cement ◽  
Order Of Magnitude ◽  
Set Up ◽  
Water Saturated

We revisit the poromechanics set up by Olivier Coussy for better understanding of the mechanical effect of partial freezing in cohesive porous materials. This approach proves to be able to quantitatively predict swelling even if the in-pore liquid does not expand when solidifying. In this case, dilation results from the so-called cryosuction process that dominates thermal shrinkage under cooling, as shown in our analysis conducted on the historical experiment run by Beaudoin and MacInnis (1974, “The Mechanism of Frost Damage in Hardened Cement Paste,” Cem. Concr. Res., 4, pp. 139–147) on benzene saturated 24-h old cement paste. Both mechanisms are also at work when freezing water saturated early age cement paste with air voids. In this case, the cryosuction process results in shrinkage and should be added to the thermal shrinkage, their respective amplitudes being temperature dependent but, a priori, of the same order of magnitude.

scholarly journals A Model for Electrical Conductivity of Porous Materials under Saturated Conditions

2021 ◽  
Vol 37 (2) ◽  
Author(s):  
Nguyen Van Nghia ◽  
Nguyen Manh Hung ◽  
Luong Duy Thanh
Keyword(s):  
Electrical Conductivity ◽  
Porous Materials ◽  
Geophysical Methods ◽  
Electrical Conductance ◽  
Environmental Issues ◽  
Geological Material ◽  
Microstructural Parameters ◽  
Proposed Model ◽  
Model Predictions ◽  
Water Saturated

Measurements of electrical conductivity have been used for the geological material characterizations due to their sensitivity to various parameters of porous materials. It is one of the most used geophysical methods in geological, geotechnical, and environmental issues. In this study, we develop a theoretical model for predicting the electrical conductivity of porous media under water-saturated conditions using a similarly skewed pore size distribution. The proposed model is related to the electrical conductivity of the pore fluid, the specific electrical conductance and the microstructural parameters of a porous medium. The model predictions are successfully compared with published experimental data as well as another model available in literature. The model opens up new possibilities for prediction of the electrical conductivity of porous materials.

An Environmental Wet Cell For High Voltage Electron Microscopy

1973 ◽  
Vol 31 ◽  
pp. 18-19
Author(s):  
N.J. Tighe ◽  
H.M. Flower ◽  
P.R. Swann
Keyword(s):  
Electron Microscopy ◽  
High Temperature ◽  
Image Quality ◽  
Inelastic Scattering ◽  
High Voltage ◽  
High Voltage Electron Microscopy ◽  
Voltage Electron ◽  
Environmental Cell ◽  
Water Saturated ◽  
High Temperature Gas

A differentially pumped environmental cell has been developed for use in the AEI EM7 million volt microscope. In the initial version the column of gas traversed by the beam was 5.5mm. This permited inclusion of a tilting hot stage in the cell for investigating high temperature gas-specimen reactions. In order to examine specimens in the wet state it was found that a pressure of approximately 400 torr of water saturated helium was needed around the specimen to prevent dehydration. Inelastic scattering by the water resulted in a sharp loss of image quality. Therefore a modified cell with an ‘airgap’ of only 1.5mm has been constructed. The shorter electron path through the gas permits examination of specimens at the necessary pressure of moist helium; the specimen can still be tilted about the side entry rod axis by ±7°C to obtain stereopairs.

Porous materials from cellulose nanocrystal and mxene surfactants at the oil/water interface

2020 ◽  
Author(s):  
Bingqing qian ◽  
Haiqiao Wang ◽  
Dong Wang ◽  
Hao-Bin Zhang ◽  
Jessica Wu ◽  
...  
Keyword(s):  
Porous Materials ◽  
Cellulose Nanocrystal ◽  
Water Interface ◽  
Oil Water

Effect of structure of porous materials on their self-cleaning from a liquid pha

2018 ◽  
Vol 4 (4) ◽  
pp. 52-63
Author(s):  
V. Yu. Shumskaya ◽  
S. F. Zhandarov ◽  
L. A. Kalinin ◽  
L. F. Ivanov ◽  
V. V. Snezhkov ◽  
...  
Keyword(s):  
Porous Materials ◽  
Self Cleaning ◽  
Effect Of Structure
Sign in / Sign up

Export Citation Format

Share Document