Article
Geochemistry & Geophysics
J. Weaver, A. Lamur, T. D. Lea, F. B. Wadsworth, J. E. Kendrick, J. Schauroth, Y. Lavallee
Summary: This study experimentally and theoretically investigates the evolution of permeable networks during sintering of hot volcanic systems. The results show the competition between vesiculation and diffusive outgassing, and suggest that classical sintering models must be modified to account for these processes.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Review
Geochemistry & Geophysics
J. Diaz-Curiel, B. Biosca, L. Arevalo-Lomas, M. J. Miguel
Summary: The tortuosity of porous solids is a fundamental concept in understanding fluid flow capacity. However, traditional expressions of tortuosity have been shown to lack true hydrodynamic sense, with disparities in results from different relationships based on these expressions. Additionally, inconsistencies have been found in widely accepted assumptions, leading to the proposal of a new tortuosity ratio for a better understanding of flow in granular porous media.
SURVEYS IN GEOPHYSICS
(2021)
Article
Chemistry, Physical
Samantha L. Flores-Lopez, Luis A. Ramirez-Montoya, M. Dolores Casal, Miguel A. Montes-Moran, J. Angel Menendez, Ana Arenillas
Summary: Extensive studies have been conducted on the correlation between synthesis variables and the final properties of resorcinol-formaldehyde carbon gels. Different combinations of synthesis variables can lead to carbon gels with similar pore sizes and porosity, but their behaviors in applications may vary. The distribution and connectivity of polymeric clusters are strongly influenced by factors such as water and methanol content in the precursor solution, affecting pore tortuosity and material permeability. Increasing water content or using a suitable combination of methanol content and precursor solution pH during the polymerization process can result in less tortuous pore structures in carbon gels with the same porosity.
Article
Energy & Fuels
Yafei Luo, Binwei Xia, Honglian Li, Huarui Hu, Mingyang Wu, Kainan Ji
Summary: Coal is a dual-porosity medium with internal pore-fracture structure, and understanding the relationship between permeability and pore-fracture structure characteristics is crucial for predicting coalbed methane productivity accurately. A new fractal permeability model of dual-porosity media embedded with natural tortuous fractures has been established in this study, showing improved accuracy in predicting coal seam permeability compared to traditional models. The numerical simulation results demonstrate strong power-law relationships between coal permeability and fracture geometric characteristic parameters, validating the proposed model's accuracy.
Article
Mechanics
Lei Zhang, Weitao Zhang, Fengxian Xin
Summary: This paper establishes a theoretical model for predicting the sound absorption performance of two-dimensional rough tube porous materials. It is verified by numerical simulation and achieves good agreement, realizing high-efficiency sound absorption at lower frequencies. This study further develops the sound absorption theory of porous materials and enriches the research and design ideas of porous materials.
Article
Chemistry, Multidisciplinary
Lucia dos Santos-Gomez, Jose R. Garcia, Miguel A. Montes-Moran, Jose Angel Menendez, Santiago Garcia-Granda, Ana Arenillas
Summary: The synthesis of 3D graphene aerogels using a rapid, easy, cost-effective, and scalable industrial level methodology is reported for the first time. These aerogels exhibit low density, large macroporosity, and high electrical conductivity values reaching up to 852 S m(-1), with a porosity of 97.58%.
Article
Mechanics
Wei He, Maolin Liu, Xiangjun Peng, Fengxian Xin, Tian Jian Lu
Summary: Experimental results show that surface roughness can improve the sound absorption performance of porous materials. Through numerical simulations, it has been found that petal shaped tubes reduce acoustic transport parameters, leading to enhanced sound absorption compared to smooth tubes.
Article
Engineering, Environmental
C. Fallico, S. De Bartolo, G. F. A. Brunetti, G. Severino
Summary: The experimental study aimed to identify the hydraulic conductivity in an aquifer through different configurations and found a power law relationship between conductivity and porosity. By determining the proper fractal model, valuable indications about dispersion phenomena in aquifers were provided, particularly concerning the crucial role of tortuosity.
STOCHASTIC ENVIRONMENTAL RESEARCH AND RISK ASSESSMENT
(2021)
Article
Engineering, Geological
Junbao Wang, Qiang Zhang, Zhanping Song, Xinrong Liu, Xiaopeng Wang, Yuwei Zhang
Summary: This study conducted fatigue tests on salt rock specimens under different maximum cycling stresses to investigate the microstructural variations and damage evolution of salt rock under cyclic loading. The results showed that the pore radii varied with an increase in the number of cycles, and the porosity and permeability of the salt rock exhibited two-stage changes. The damage evolution process of the salt rock specimens consisted of three stages, with significant damage occurring near failure.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2022)
Article
Chemistry, Multidisciplinary
Xiang-Yu Gao, Yu-Lin Li, Tian-Fu Liu, Xin-Song Huang, Rong Cao
Summary: The design and synthesis of a hydrogen-bonded organic framework based on tetrathiafulvalene tetracarboxylic acid is reported, which can undergo single-crystal-to-single-crystal transformation to form two isomers. The structural characteristics and redox properties of the HOFs were conveniently tailored using the transformation of phases.
Article
Chemistry, Physical
Hao Wang, Guogang Yang, Shian Li, Qiuwan Shen, Jiadong Liao, Ziheng Jiang, Mayken Espinoza-Andaluz, Fengmin Su, Xinxiang Pan
Summary: In this paper, the lattice Boltzmann method was used to investigate the permeability and internal fluid behavior of the gas diffusion layer. It was found that a linear porosity gradient distribution resulted in higher permeability values compared to other types, and optimal porosity gradient distributions at specific porosities led to enhanced permeability.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
A. J. Navarro, M. A. Gomez, L. Daza, A. Molina-Garcia, J. J. Lopez-Cascales
Summary: The performance of an open cathode fuel cell was investigated with different gas diffusion layers in its membrane electrode assemble (MEA) preparation. A new diffusion layer called eCoCell developed in the laboratory was compared with the commercial diffusion layer Sigracet 38BC. The characterization of both diffusion layers was conducted through measuring porosity, electrical conductivity, thermal conductivity, and hydrophobicity. The results showed that the new gas diffusion layer, eCoCell, exhibited optimum performance across all studied temperatures due to its high hydrophobicity, bimodal pore distribution, low thermal conductivity, and high electrical conductivity.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Thermodynamics
Min Yan, Ming Zhou, Shugang Li, Haifei Lin, Kunyin Zhang, Binbin Zhang, Chi-Min Shu
Summary: The micropore structure of coal was reconstructed and quantitatively analysed to study its impact on gas seepage in a coal reservoir. It was found that porosity and pore structure had significant effects on gas seepage velocity and apparent permeability. The study revealed that gas seepage velocity increased with porosity, with different pore structures exhibiting varied gas seepage characteristics.
Article
Materials Science, Ceramics
Shalini Rajpoot, Jang-Hoon Ha, Young-Wook Kim
Summary: The mechanical, thermal, and electrical properties of porous SiC ceramics can be independently tuned by selecting the appropriate starting particle size and sintering atmosphere. In the porosity range of 40% to 54%, the compressive strength and thermal conductivity of porous SiC ceramics increased as the porosity increased, contrary to the general trend. Additionally, the electrical conductivity of porous SiC ceramics sintered in N-2 atmosphere was significantly higher compared to those sintered in Ar atmosphere due to N doping in the PCS-derived beta-SiC.
CERAMICS INTERNATIONAL
(2021)
Article
Soil Science
Lin Liu, Weiliu Li, Yili Lu, Tusheng Ren, Robert Horton
Summary: Soil thermal conductivity (λ) and electrical conductivity (σ) are influenced by soil water content (θ), texture, bulk density (ρb), temperature, structure, and organic matter content. The quantitative relationship between λ and σ, as well as how soil texture and ρb modify this relationship, is not well understood. In this study, a new model for normalized σ curves of soils with a unimodal pore size distribution is developed, and the correlation between λ(θ) and σ(θ) curves is examined. Measurements of θ, λ, and σ on two soils confirm the model's performance.
Article
Geochemistry & Geophysics
Leif Karlstrom, Heather M. Wright, Charles R. Bacon
EARTH AND PLANETARY SCIENCE LETTERS
(2015)
Article
Geochemistry & Geophysics
Heather M. Wright, Jorge A. Vazquez, Duane E. Champion, Andrew T. Calvert, Margaret T. Mangan, Mark Stelten, Kari M. Cooper, Charles Herzig, Alexander Schriener
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2015)
Article
Geosciences, Multidisciplinary
Agustin Cabrera, Roberto F. Weinberg, Heather M. N. Wright
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
(2015)
Article
Geosciences, Multidisciplinary
H. Elizabeth Gaunt, Benjamin Bernard, Silvana Hidalgo, Antonio Proano, Heather Wright, Patricia Mothes, Evelyn Criollo, Ulrich Kueppers
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
(2016)
Article
Geochemistry & Geophysics
Y. Su, Christian Huber, Olivier Bachmann, Zoltan Zajacz, Heather Wright, Jorge Vazquez
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2016)
Article
Geosciences, Multidisciplinary
Joel E. Robinson, Charles R. Bacon, Jon J. Major, Heather M. Wright, James W. Vallance
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
(2017)
Article
Geosciences, Multidisciplinary
Heather M. N. Wright, John S. Pallister, Wendy A. McCausland, Julia P. Griswold, Supriyati Andreastuti, Agus Budianto, Sofyan Primulyana, Hendra Gunawan
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
(2019)
Article
Geosciences, Multidisciplinary
Natalia Pardo, Shane J. Cronin, Heather M. N. Wright, C. Ian Schipper, Ian Smith, Bob Stewart
BULLETIN OF VOLCANOLOGY
(2014)
Article
Geochemistry & Geophysics
Heather Michelle Wright, Charles R. Bacon, Jorge A. Vazquez, Thomas W. Sisson
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2012)
Article
Geosciences, Multidisciplinary
Heather M. Wright, Katharine V. Cashman
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2014)
Article
Geosciences, Multidisciplinary
Mary C. Benage, Heather M. N. Wright, Michelle L. Coombs
Summary: This study investigates the impact of heterogeneous andesitic eruptions on microlite crystallization and vesiculation, revealing structural and compositional differences between the LSA and HSA end members, indicating eruption from multiple isolated shallow magma reservoirs. HSA pyroclasts have lower crystallinities, while LSA pyroclasts exhibit higher crystallinities influenced by composition.
BULLETIN OF VOLCANOLOGY
(2021)
Article
Geology
Thomas Giachetti, Kathleen R. Trafton, Joshua Wiejaczka, James E. Gardner, James M. Watkins, Thomas Shea, Heather M. N. Wright
Summary: New textural observations of pumice aggregates during volcanic eruptions suggest that some primary products of magma fragmentation can survive by sintering together, providing insights into the potential energy of fragmentation.
Article
Geosciences, Multidisciplinary
H. M. N. Wright, R. Cioni, K. V. Cashman, P. Mothes, M. Rosi
Summary: During the eruption sequence of Guagua Pichincha volcano in Ecuador from 1999-2001, rock samples provided information about magma storage, ascent, decompression, degassing, repressurization, and regassing prior to eruption. The melt inclusions revealed high water and carbon dioxide contents, while mineral crystals exhibited variations in their compositions. The seismic activity and surface tilt changes indicated a sudden evacuation of magma in the shallow conduit. These findings are significant for understanding volcanic eruptions.
BULLETIN OF VOLCANOLOGY
(2023)
Article
Geochemistry & Geophysics
Ozge Karakas, Josef Dufek, Margaret T. Mangan, Heather M. Wright, Olivier Bachmann
EARTH AND PLANETARY SCIENCE LETTERS
(2017)
Article
Geosciences, Multidisciplinary
Jacob B. Lowenstern, Vincent van Hinsberg, Kim Berlo, Moritz Liesegang, Kayla Iacovino, Ilya N. Bindeman, Heather M. Wright
FRONTIERS IN EARTH SCIENCE
(2018)
Article
Geochemistry & Geophysics
Lingyu Zhang, Kristoffer Szilas
Summary: This study presents new petrological and geochemical data for the Narssaq Ultramafic Body (NUB) in the Itsaq Gneiss Complex of SW Greenland. The results indicate that the ultramafic rocks of NUB are not mantle residues, but instead represent crustal cumulates derived from high-Mg magmas.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Rong Xu, Sarah Lambart, Oliver Nebel, Ming Li, Zhongjie Bai, Junbo Zhang, Ganglan Zhang, Jianfeng Gao, Hong Zhong, Yongsheng Liu
Summary: This study investigated the iron isotope compositions of Cenozoic basalts in Southeast China, finding significant variations related to different types of basalts and their respective sources.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
C. J. Ebinger, Miriam C. Reiss, Ian Bastow, Mary M. Karanja
Summary: The East African rift system is formed above mantle upwellings and the formation of rifts is related to lithospheric thinning and magmatic activity. The amount of splitting varies spatially and the fast axes are predominantly parallel to the orientation of the rifts. Thick lithospheric modules have less splitting and different orientations, which may indicate mantle plume flow. Splitting rotates and increases in strength as it enters the rift zones, suggesting that the anisotropy is mainly present at shallow depths.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Correction
Geochemistry & Geophysics
Ekaterina Rojas-Kolomiets, Owen Jensen, Michael Bizimis, Gene Yogodzinski, Lukas Ackerman
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Robert W. Nicklas, Igor S. Puchtel, Ethan F. Baxter
Summary: Oxygen fugacity is a fundamental parameter for understanding redox processes in igneous systems. This study compares the Fe-XANES oxybarometry method with the V-in-olivine method for evaluating fO(2) in MORB lavas. The results show that the V-in-olivine method is not applicable to samples with low MgO content, and that the majority of Archean komatiite sources have lower fO(2) than modern MORB.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Chunfei Chen, Stephen F. Foley, Sebastian Tappe, Huange Ren, Lanping Feng, Yongsheng Liu
Summary: The volatile components CO2 and H2O play a major role in mantle melting and heterogeneity. In this study, Ca isotopes were used to trace the lithological heterogeneity in alkaline magmatic rocks. The results revealed the presence of K-richterite and carbonate components as the source of alkaline magmas with low delta 44/40Ca values. These findings highlight the importance of Ca isotopes as a robust tracer of lithological variation caused by volatiles in the Earth's upper mantle.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Timothee Jautzy, Gilles Rixhon, Regis Braucher, Romain Delunel, Pierre G. Valla, Laurent Schmitt, Aster Team
Summary: Although the current approach to estimate catchment-wide denudation rates using only 10Be concentrations has made significant progress in geomorphology, this study argues for the inclusion of 26Al measurements and testing of steady-state assumptions in slow eroding, formerly glaciated landscapes. The study conducted measurements of both 10Be and 26Al in stream sediments from the Vosges Massif in France and found that elevation, slope, channel steepness, and precipitation were the primary factors controlling denudation rates. The study also revealed a significant relationship between the extent of past glaciation and the cosmogenic (un-)steadiness in the stream sediments.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Erik van der Wiel, Douwe J. J. van Hinsbergen, Cedric Thieulot, Wim Spakman
Summary: Numerical models of Earth's mantle dynamics can predict the vigour and mixing of mantle flow, and the average slab sinking rates are an unexplored parameter that can provide intrinsic information on these characteristics. Through numerical experiments, it has been found that slab sinking rates are strongly correlated with mantle convection and mixing, and may explain geochemical observations from hotspot volcanoes.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)