Macropore structure and permeability of clay fill samples from a historic clay fill earthwork

2019 ◽  
Vol 19 ◽  
pp. 96-109 ◽  
Author(s):  
D.M. Muddle ◽  
K.M. Briggs
Keyword(s):  
Macropore Structure

Effect of Macropore Structure on Desorption Diffusion Performance of N-Pentane on 5A Zeolite

2013 ◽  
Vol 634-638 ◽  
pp. 731-735 ◽  
Author(s):  
Lu Shi ◽  
Zong Jian Liu ◽  
Qun Cui ◽  
Hai Yan Wang ◽  
Hu Qing Yao
Keyword(s):  
Diffusion Coefficients ◽  
Diffusion Rate ◽  
Low Pressure ◽  
Fast Diffusion ◽  
Desorption Rate ◽  
Macropore Structure ◽  
5A Zeolite ◽  
Desorption Equilibrium

Desorption rate curves of n-pentane on 5A zeolites at 418 K and 10-0.03 kPa were determined, and the effects of different macropore structure on desorption performance were analyzed. Results show that macropore distribution of 5A-1 concentrates in 0.25-1.25 μm, while that of 5A-2 ranges from mesopore category to 0.3 μm, but 5A-3 contains both pores of 0.01-0.1 μm and 0.2-2 μm inside, reflecting a broadest distribution; 5A-3, 5A-1 and 5A-2 reach desorption equilibrium after 1100 s, 1400 s and 2000 s respectively at 0.03 kPa, indicating that abundant macropores make n-pentane fastest desorbed from 5A-3, but this advantage gradually disappears with the increasing pressure; the effective desorption diffusion coefficients of n-pentane on 5A-1, 5A-2 and 5A-3 are 4.2×10-15-2.2×10-14 m2/s, 2.0×10-15-2.3×10-14 m2/s, 7.4×10-15-2.4×10-14 m2/s respectively, suggesting that plenty macropores make the diffusivity less affected by the changes of pressure, which can guarantee a fast diffusion rate of n-pentane even at low pressure.

Determining the macropore structure of capillary-porous materials by various methods

1972 ◽  
Vol 23 (1) ◽  
pp. 909-912
Author(s):  
D. P. Litevchuk ◽  
M. F. Kazanskii ◽  
P. P. Lutsik
Keyword(s):  
Porous Materials ◽  
Macropore Structure

Self-Assembled Single-Crystalline GaN Having a Bimodal Meso/Macropore Structure To Enhance Photoabsorption and Photocatalytic Reactions

2019 ◽  
Vol 11 (4) ◽  
pp. 4233-4241 ◽  
Author(s):  
Taishi Kimura ◽  
Shunsuke Sato ◽  
Keita Kataoka ◽  
Takeshi Morikawa ◽  
Daisuke Nakamura
Keyword(s):  
Single Crystalline ◽  
Macropore Structure ◽  
Self Assembled ◽  
Photocatalytic Reactions

Characterizing and linking macropore structure characteristics to water infiltration in stony soils

2021 ◽  
Author(s):  
Cuiting Dai ◽  
Yiwen Zhou ◽  
Zhaoxia Li ◽  
Tianwei Wang ◽  
Jun Deng
Keyword(s):  
Hydraulic Conductivity ◽  
Hydraulic Properties ◽  
Water Pressure ◽  
Saturated Hydraulic Conductivity ◽  
Central China ◽  
Water Infiltration ◽  
Three Gorges Reservoir Area ◽  
X Ray ◽  
Forest Sites ◽  
Macropore Structure

<p>Macropores have been widely recognized as preferential pathways for the rapid movement of water into soils. The objectives of this study were to characterize soil macropore structures using X-ray computed tomography (CT) and to explore the relationships between macropore characteristics and hydraulic properties of stony soils. To achieve these, a total of 18 soil columns were sampled from six sites (three sites covered with grass and three sites with forest) with stony soils located in a mountain watershed in the Three Gorges Reservoir Area of Central China. Field infiltration experiments were carried out at the sampling sites under near-saturated conditions using a tension disc infiltrometer. The three-dimensional macropore structures were visualized from X-ray CT images, and total macroporosity, connected macroporosity, macropore density, specific surface area, degree of anisotropy, fractal dimension, and hydraulic radius were characterized. The results showed that the largest total macroporosity and connected macroporosity were observed at forest sites. The macropore structure with high connectivity could facilitate greater water infiltration into the soils. The near-saturated hydraulic conductivity Kh was significantly higher at the forest sites than at the grassland sites at four water pressure heads. The stony soils studied had heterogenous macropore systems with large and well-connected macropores. The macroporosity of macropores with equivalent diameters between 0.5 and 2 mm was found best to predict the near-saturated hydraulic conductivity. Our study provides a helpful technique for a better understanding of stony soil macropores and hydraulic properties by a combination of 3D visualization methods and traditional hydraulic analysis.</p>

scholarly journals Effective Removal of Congo Red by Triarrhena Biochar Loading with TiO2 Nanoparticles

Scanning ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-7
Author(s):  
Peng Yu ◽  
Tao Hu ◽  
Hong Hui Chen ◽  
Fangfang Wu ◽  
Hui Liu
Keyword(s):  
Aqueous Solution ◽  
Tio2 Nanoparticles ◽  
Congo Red ◽  
Sol Gel ◽  
Environmentally Friendly ◽  
Absorption Capacity ◽  
Gel Method ◽  
Effective Removal ◽  
Macropore Structure ◽  
Prepared Composite

A composite of pyrolytic Triarrhena biochar loading with TiO2 nanoparticles has been synthesized by the sol-gel method. The composite shows a well-developed hollow mesoporous and macropore structure as characterized by XRD, BET, and SEM. When used as an absorbent to remove Congo red from aqueous solution, it was found that as-prepared composite performed better absorption capacity than single biochar or TiO2. The results suggest that biochar loading with TiO2 could be promisingly implemented as an environmentally friendly and inexpensive adsorbent for Congo red removal from wastewater.

scholarly journals Guidelines for tuning the macropore structure of monolithic columns for high-performance liquid chromatography

2018 ◽  
Vol 42 (2) ◽  
pp. 522-533 ◽  
Author(s):  
José Luís Dores-Sousa ◽  
Alejandro Fernández-Pumarega ◽  
Jelle De Vos ◽  
Michael Lämmerhofer ◽  
Gert Desmet ◽  
...  
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
High Performance ◽  
Monolithic Columns ◽  
Macropore Structure
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