Article
Geochemistry & Geophysics
Aida Mendieta, Damien Jougnot, Philippe Leroy, Alexis Maineult
Summary: Clay material characterization is crucial for various applications, and the study presents new spectral induced polarization (SIP) data for different types of clay samples at varying salinities. The complex conductivity spectra show an increase in real conductivity with salinity and a nonmonotonic behavior in the imaginary part. The study validates a new laboratory protocol and tests an empirical relationship between conductivity values, contributing to a better understanding of the electrical response of clay materials.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geochemistry & Geophysics
Edmundo Placencia-Gomez, Judith Robinson, Lee Slater, Nikolla P. Qafoku
Summary: The sensitivity of the spectral induced polarization (SIP) method to induced calcite precipitation in natural sediments was explored. The results showed that both high frequency and low frequency mechanisms can effectively monitor the precipitation of calcite. Additionally, the characteristic low frequency was found to change with time, indicating the interaction between calcite and sediment grains. The study suggests that the development of a low frequency polarization length scale for monitoring calcite precipitation is promising, but further laboratory research is needed.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geosciences, Multidisciplinary
Kuzma Tsukanov, Nimrod Schwartz
Summary: This study developed a mechanistic model for the spectral induced polarization (SIP) response of plant roots, showing that root polarization is linearly related to external surface area and polarization length scale is the root's diameter. Injecting current into the plant's stem results in higher polarization, with the polarization length scale being the cell diameter. These findings help quantify the link between root dimensions and their electrical signature.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geosciences, Multidisciplinary
A. K. Abd Malik, A. Madun, M. K. Abu Talib, N. Wahab, M. F. Md Dan
Summary: The electrical resistivity method, a non-destructive technique using electrical properties, is used to detect anomalies in the subsurface of the earth. Various factors, including grain sizes, soil types, and water content, influence the apparent resistivity. This study investigates the effects of particle sizes on resistivity and chargeability values, finding that decreasing particle sizes decrease the apparent resistivity and increase the chargeability value due to changes in porosity.
PHYSICS AND CHEMISTRY OF THE EARTH
(2023)
Article
Geochemistry & Geophysics
Ziang He, Hongzhu Cai, Shuai Li, Jinchi Xian, Xiangyun Hu
Summary: Introduces the induced polarization phenomenon and its application in rock property classification, proposes a machine learning approach based on LSTM networks for efficient inversion of IP parameters, and demonstrates the effectiveness of the method through synthetic model studies and rock sample measurements.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Multidisciplinary Sciences
Efemena D. Emmanuel, Kennedy O. Doro, Ruth E. Iserhien-Emekeme, Edmund A. Atakpo
Summary: Water retention in fishponds in the Niger-Delta region of Nigeria is challenging due to climate-induced water loss and fluctuating groundwater levels. This study assesses the use of non-invasive geophysical methods to guide the selection of suitable sites for establishing fishponds. The results suggest the need for characterizing subsurface variations before constructing medium to large-scale earthen fishponds in the area.
Article
Geochemistry & Geophysics
Xiaolong Tong, Liangjun Yan, Kui Xiang
Summary: The permeability of fluid-bearing rock is a crucial factor for reservoir prediction. Traditional electrical K-C models can effectively characterize the permeability-resistivity relationship, but are limited by the complex pore structure and mineral composition of compacted reservoirs. In this study, a semi-empirical reservoir permeability prediction model based on the modified generalized effective medium theory of induced polarization (MGEMTIP) is proposed. The theoretical and experimental results show that the MGEMTIP-based model is more suitable for low-porosity and low-permeability rocks containing low-resistivity minerals, and can provide predictions within the same order of magnitude.
Article
Geochemistry & Geophysics
Charles L. Berube, Frederique Baron
Summary: Mechanistic induced polarization (IP) models describe the relationships between the physical properties of geomaterials and their frequency-dependent complex conductivity. However, practitioners rarely use these models due to uncertainties in estimating petrophysical properties from complex conductivity spectra. We propose a framework using a conditional variational autoencoder (CVAE) to assess the sensitivity and parameter estimation limitations of any IP model. Using synthetic mixtures of metallic mineral inclusions in electrolyte-filled geomaterials, we trained the CVAE and found that certain petrophysical properties play a more critical role in generating spectral IP data. Furthermore, constraining electrochemical properties improved the estimates of metallic inclusion size.
Article
Engineering, Geological
Mingyang Song, Qianting Hu, Huihui Liu, Quangui Li, Yuebing Zhang, Zhifang Hu, Jichuan Liu, Yize Deng, Xuewen Zheng, Mingjie Wang
Summary: Understanding the response mechanism of multiparameter rock fractures is essential for accurate crack diagnosis. This study used three-point bending tests, scanning electron microscopy, and real-time resistivity and acoustic emission data to investigate crack propagation and its correlation with rock resistivity or acoustic emission. The results reveal the influence of crack geometry complexity on circuit connectivity and the relationship between resistivity variation and fracture toughness.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Geochemistry & Geophysics
Gianluca Fiandaca, Per-Ivar Olsson, Pradip Kumar Maurya, Anders Kuhl, Thue Bording, Torleif Dahlin, Esben Auken
Summary: Negative-induced polarization (IP) time-domain transients, currently considered as measurement errors, are actually physically possible and can provide valuable information about the subsurface. Full-waveform IP data processing can help identify these heterodox transients. The subsurface Cole-Cole parameter sensitivities and time-varying IP potential play a significant role in the formation of these transients. Understanding and analyzing them can improve data processing and reduce the resources required for spectral inversion of time-domain data.
Article
Engineering, Environmental
Clemens Moser, Andrew Binley, Adrian Flores Orozco
Summary: There is a growing interest in using 3D configurations in spectral induced polarization (SIP) surveys for characterizing the near-surface environment. This study investigates the enhanced resolution of SIP measurements through true 3D configurations, showing that parallel 2D collinear arrays result in artifacts and loss of resolution in the 3D structure. The findings demonstrate that 3D configurations can better resolve polarizable anomalies and provide a more accurate interpretation of waste composition and quantification of waste volume.
Article
Geochemistry & Geophysics
P-A Duvillard, F. Magnin, A. Revil, A. Legay, L. Ravanel, F. Abdulsamad, A. Coperey
Summary: Knowledge of the thermal state of steep alpine rock faces is crucial for assessing geohazards related to permafrost degradation. This study uses a new petrophysical model with electrical conductivity and normalized chargeability data to infer permafrost distribution, finding that only the NW face of the rock ridge is frozen. By modeling bedrock temperature across the ridge and confirming permafrost presence, a low-cost approach to monitoring temperature distribution in Alpine rock walls is provided in response to climate change.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Chemistry, Multidisciplinary
Peng Shao, Yanjun Shang, Muhammad Hasan, Xuetao Yi, He Meng
Summary: The study highlights the importance of using geophysical methods (ERT, IP, and SP) for investigating hard rock sites. Geophysical methods have advantages over traditional borehole tests, providing wider area coverage. Integration of different geophysical methods can lead to more accurate interpretations of subsurface structures and groundwater flow.
APPLIED SCIENCES-BASEL
(2021)
Article
Plant Sciences
Yehao Zhang, Lan Miao, Qing Peng, Xiaodi Fan, Wenting Song, Bin Yang, Peng Zhang, Guangyu Liu, Jianxun Liu
Summary: The study demonstrates that Parthenolide (PTL) can regulate neuroinflammation and protect against ischemic brain injury by modulating microglial polarization via the RhoA/ROCK pathway.
Article
Chemistry, Physical
Hossein Rezaei, Abolfazl Dehghan Monfared, Aboozar Soleymanzadeh
Summary: Accurate determination of cementation factor (m) is crucial for petrophysical characterization of underground reservoirs. The presence of clay minerals in rock texture affects the evaluation process, but it is often overlooked in existing approaches. This study proposes a modified form of electrical rock typing technique that incorporates the effect of clay minerals to improve the prediction of cementation factor. Comparative studies show the superiority of this methodology compared to classical rock typing approaches.
APPLIED CLAY SCIENCE
(2023)
Article
Engineering, Chemical
Alejandro Fernandez Visentini, Pietro de Anna, Damien Jougnot, Tanguy Le Borgne, Yves Meheust, Niklas Linde
Summary: This study investigates the impact of diffusion-limited mixing on bulk electrical conductivity in a porous medium with layered solute concentration distribution. The results reveal that the electrical data correlate well with time-series of solute mixing descriptors.
TRANSPORT IN POROUS MEDIA
(2023)
Article
Environmental Sciences
Flore Rembert, Damien Jougnot, Linda Luquot, Roger Guerin
Summary: Geochemistry and reactive transport are crucial in various fields. In this study, a new workflow combining geochemistry and geophysics is developed to predict the electrochemical response of the self-potential method.
Article
Environmental Sciences
Mariangeles Soldi, Luis Guarracino, Damien Jougnot
Summary: Water flow in porous media is influenced by the microscale structure of the pore space. A new analytical model is developed to analyze the effect of pore geometry on hydraulic properties under partially saturated conditions. The model shows differences in macroscopic hydraulic properties due to changes in pore geometry, but no variations in relative hydraulic properties.
ENVIRONMENTAL FLUID MECHANICS
(2022)
Article
Environmental Sciences
Lea Enguehard, Nicola Falco, Myriam Schmutz, Michelle E. Newcomer, Joshua Ladau, James B. Brown, Laura Bourgeau-Chavez, Haruko M. Wainwright
Summary: Coastal wetlands in the Great Lakes Region, specifically along Lake Erie, were studied using a machine learning clustering approach to identify spatial regions with co-varied properties. The study found that topography, soil texture, and plant productivity influence the distribution of wetland land covers. Clustering analysis also revealed regions with distinct environmental characteristics and sensitivity to lake-level variations.
Article
Water Resources
Luong Duy Thanh, Nguyen Van Nghia, Phan Van Do, Tran Thi Chung Thuy, Damien Jougnot
Summary: This study proposed a new model to estimate the streaming potential coupling coefficient in porous media based on the Critical Path Analysis method. By comparing experimental and simulated data, it was shown that the model is applicable to porous media with different pore size distributions, and a relationship between the critical pore radius and grain diameter was also identified.
ADVANCES IN WATER RESOURCES
(2022)
Article
Soil Science
P. McLachlan, M. Schmutz, J. Cavailhes, S. S. Hubbard
Summary: This study investigates the ability of the frequency domain electromagnetic induction (EMI) method to generate physicochemical soil maps related to grapevine vigor. By using a flexible clustering approach and the in-phase components of EMI measurements, distinct soil zones with different physicochemical characteristics were successfully identified. It is worth noting that this approach does not rely on prior information or calibration of EMI measurements. Extensive soil texture and physicochemical measurements were used to compare the different zones identified. Additionally, the assessment of grapevine vigor using NDVI data revealed correlations with organic matter, nitrogen, CEC, pH, CaO, and copper concentration in one of the studied sites.
Article
Geochemistry & Geophysics
A. Mendieta, A. Maineult, P. Leroy, D. Jougnot
Summary: We collected a dataset of spectral induced polarization (SIP) of artificial heterogeneous non-consolidated clay samples in order to better understand the influence of heterogeneities on the geo-electrical signature. Comparing the experimental data with classical mixing laws and complex conductance network models, we found that the mixing laws better predict the real conductivity, while the conductance network models better predict the shape of the spectra (presence of polarization peaks at particular frequencies). This study is important for better characterizing heterogeneous clay systems using SIP.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
Luong Duy Thanh, Nguyen Van Nghia, Phan Van Do, Pham Tien Du, Damien Jougnot
Summary: We propose a unified model to describe the permeability, electrical conductivity, and streaming potential coupling coefficient in variably saturated fractured media. By conceptualizing the fractured medium as a partially saturated bundle of parallel capillary slits with varying sizes, we establish a pressure head-saturation relationship based on the fractal scaling law of fracture size distribution. The model explicitly depends on pore water chemistry, interface properties, microstructural parameters of fractured media, and water saturation, and shows good agreement with experimental and simulated data as well as another model from the literature.
GEOPHYSICAL PROSPECTING
(2023)
Article
Geochemistry & Geophysics
Andre Revil, Ahmad Ghorbani, Damien Jougnot, Beatrice Yven
Summary: A petrophysical model has been developed to describe the spectral induced polarization (IP) in clay rocks, particularly accounting for the Maxwell-Wagner polarization. The model establishes a connection between complex conductivity and relative permeability of the material. The model was applied to Callovo-Oxfordian clay rocks, and laboratory experiments were conducted to study the effect of desiccation on the spectral-IP response and to analyze other relevant parameters.
Article
Engineering, Chemical
Santiago G. Solazzi, Damien Jougnot, J. German Rubino, Klaus Holliger
Summary: We propose an analytical model to calculate frequency-dependent relative permeability functions for partially saturated porous media, taking into account viscous coupling effects. By considering the oscillatory motion of two immiscible fluid phases and solving the Navier-Stokes equations at the pore scale, we obtain closed analytical expressions for the complex-valued and frequency- and saturation-dependent relative permeability functions. Our results show that viscous coupling effects significantly impact flow characteristics in the viscous and inertial regimes and may induce two critical frequencies in the dynamic relative permeability curves.
TRANSPORT IN POROUS MEDIA
(2023)
Article
Geochemistry & Geophysics
Kaiyan Hu, Hengxin Ren, Qinghua Huang, Ling Zeng, Karl E. Butler, Damien Jougnot, Niklas Linde, Klaus Holliger
Summary: Recent developments in seismoelectric signals show potential for studying near-surface hydrogeological properties. The proposed Multi-Channel SeismoElectric Spectral Ratios (MC-SESRs) and the broad learning (BL) model can accurately determine permeability and water table depth. The MC-SESRs inversion has potential applications in non-invasive monitoring of shallow porous media.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geochemistry & Geophysics
Haoliang Luo, Damien Jougnot, Anne Jost, Jidong Teng, Luong Duy Thanh
Summary: Determining and monitoring liquid water saturation and permeability in saturated frozen porous media are critical issues in cold regions. This study uses geophysical methods to non-invasively determine and monitor liquid water saturation and permeability in frozen porous media. The proposed model successfully predicts the electrical conductivity of frozen soils using different pore size distributions and provides new possibilities for describing the distribution and dynamics of liquid water in frozen environments using geoelectrical and electromagnetic techniques.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Review
Environmental Sciences
Bertille Loiseau, Simon D. Carriere, Damien Jougnot, Kamini Singha, Benjamin Mary, Nicolas Delpierre, Roger Guerin, Nicolas K. Martin-StPaul
Summary: This review article discusses how geophysical techniques can contribute to the study of forest ecology, providing new insights into root systems, water dynamics, and spatial heterogeneity in subsurface properties. This multidisciplinary approach offers opportunities for quantitative assessment of biophysical properties and understanding forest response to the environment and climate change.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Geosciences, Multidisciplinary
Thomas Hermans, Pascal Goderniaux, Damien Jougnot, Jan H. Fleckenstein, Philip Brunner, Frederic Nguyen, Niklas Linde, Johan Alexander Huisman, Olivier Bour, Jorge Lopez Alvis, Richard Hoffmann, Andrea Palacios, Anne-Karin Cooke, Alvaro Pardo-Alvarez, Lara Blazevic, Behzad Pouladi, Peleg Haruzi, Alejandro Fernandez Visentini, Guilherme E. H. Nogueira, Joel Tirado-Conde, Majken C. Looms, Meruyert Kenshilikova, Philippe Davy, Tanguy Le Borgne
Summary: This paper discusses the interest and potential for monitoring and characterizing spatial and temporal variability in hydrogeological processes, and proposes a classification of processes and applications at different scales based on high-resolution space-time imaging. The authors call for the validation of 4D imaging techniques at highly instrumented observatories and the harmonization of open databases to share hydrogeological data sets in their 4D components.
HYDROLOGY AND EARTH SYSTEM SCIENCES
(2023)
Article
Geosciences, Multidisciplinary
Flore Rembert, Marie Leger, Damien Jougnot, Linda Luquot
Summary: In this study, we monitored the electrical conductivity of two limestone core samples during controlled dissolution experiments to better understand the mechanisms responsible for conduits formation and develop detection methods for these processes. We found that constrictivity is more affected by calcite dissolution compared to tortuosity, and the characteristic Johnson length is a valuable structural witness of calcite dissolution impact linking electrical and hydrological properties.
HYDROLOGY AND EARTH SYSTEM SCIENCES
(2023)
Article
Chemistry, Physical
Nadine J. Kanik, Artur Kuligiewicz, Jeffrey T. Cullen
Summary: This study examined the effects of different pre-treatments on the structural H-isotope composition of clay minerals. The results showed that different pre-treatments had varied impacts on different clay minerals, and the choice of pre-treatment should be based on the specific properties and mineralogy of the samples.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
Lorenzo Lisuzzo, Giuseppe Cavallaro, Stefana Milioto, Giuseppe Lazzara
Summary: This study proposes Pickering emulsions based on wax and halloysite clay nanotubes for coating silk sutures to increase their loading capacity towards eosin. The presence of halloysite/wax microspheres on the surface of silk sutures has also been explored for controlled release of hydrophobic drugs. The influence of the coating on the thermal and mechanical properties of the sutures has been studied using various techniques. In conclusion, the wax/halloysite Pickering emulsions can successfully generate hydrophobic microdomains on the surface of silk sutures, leading to enhanced flexibility and improved loading capacity towards eosin.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
Bruna F. Alves, Rita C. P. Nunes, Luiz C. Bertolino, Elizabete F. Lucas
Summary: Operational problems in the oil industry caused by the precipitation of paraffins can be prevented by using polymeric additives. This article evaluates the use of polymeric nanocomposites as pour point reducers in different types of crude oil and finds that they are more efficient than pure poly(ethylene-covinyl acetate) (EVA) in reducing the pour point. The nanocomposites also modify the wax crystals and reduce the viscosity of the oil samples.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
K. A. Daniels, C. C. Graham, A. C. Wiseall, J. F. Harrington, P. Sellin
Summary: Geological storage with clay buffer is widely preferred for removing hazardous radioactive waste. The impact of fluid salinity and void space on the swelling behavior of barrier bentonites was examined through experiments. The findings suggest that clay swelling is suppressed at higher salinities, which affects the void-filling process.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
N. Werling, A. Kuligiewicz, A. Steudel, R. Schuhmann, F. Dehn, K. Emmerich
Summary: Thermal treatment of clay minerals can be used to produce building materials and environmentally friendly binders. This process involves dehydration, dehydroxylation, breakdown of structure, and recrystallization of high temperature phases. Rehydration and rehydroxylation are important factors to consider for geopolymers and SCM.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
Xuan Wang, Hao Ding, Zhuoqun Xu, Jianmeng Zhang, Yanbin Yao
Summary: Rutile nano-TiO2 was loaded onto the surface of sericite to prepare sericite-rutile composite particles, which were then modified with HDTMS and sprayed onto the substrates to form sericite-rutile/HDTMS composite coatings with UV shielding and superhydrophobic self-cleaning properties. The coating exhibited good UV shielding rate and remained superhydrophobic after UV irradiation. The hierarchical structure of the sericite-rutile composite and the low surface energy of HDTMS contributed to the superhydrophobicity and UV shielding effect of the coating.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
Kailang Sun, Taojun Zhang, Jie Zhou, Yonghong Liu, Minfeng Zeng, Zhen Yang, Ruokun Feng, Xiaorong Ren, Peng Zhang, Baoyi Wang, Xingzhong Cao
Summary: Chitosan-Pd0 nano particles encapsulated in Al, Co-pillared montmorillonite nanocomposites were successfully synthesized using a facile one-pot heat treatment method. The Al, Co pillaring effectively expanded the surface area and generated numerous mesopores in the interlayer space of the MMt. The resultant nanocomposite exhibited similar high comprehensive catalytic performances as the one prepared by the regular divided-multistep method. The encapsulation of CS chains and doping of Co in the Al pillaring also contributed to the improved catalytic performance.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
Nathalie Fagel, Isabel Israde-Alcantara, Reza Safaierad, Marttiina Rantala, Sabine Schmidt, Gilles Lepoint, Pierre Pellenard, Nadine Mattielli, Sarah Metcalfe
Summary: Environmental conditions significantly influence clay minerals, and studying clay sediments in tropical lakes can provide valuable insights into past environmental conditions. In this study, multiproxy records from sediment cores of three crater lakes in central Mexico were analyzed. The results showed that disordered kaolinite, formed through hydrolysis and hydrothermal alteration, was the predominant mineral in the sediments. The abundance of kaolinite varied in relation to organic carbon and organic matter-related elements, and showed opposite trends with lithogenic elements. Geochemical data suggested that the increase in kaolinite abundance is linked to the formation of organo-mineral aggregates and lake level changes in closed basins.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
M. J. Martin-Alfonso, A. Mejia, F. J. Martinez-Boza, P. Partal
Summary: The drilling industry is facing new challenges to develop eco-friendlier drilling fluids. Organic modified sepiolite dispersed in oil can be an excellent additive with suitable rheological properties. This study investigated the effect of alkyl ammonium modifiers on the microstructure and rheological properties of sepiolite-vegetable oil dispersions under high-temperature and high-pressure conditions.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
Weiquan Zhan, Siyuan Yang, Shenxu Bao, Liuyi Ren, Cheng Liu
Summary: The interaction between talc and the depressor CMC was investigated through molecular dynamics simulation and density functional theory calculation. It was found that CMC showed stronger adsorption on the edge plane of talc due to enhanced interactions with polar groups and water molecules. The study also revealed specific interactions between H atoms in CMC and O atoms in the edge plane, as well as between O atoms in CMC and Si, Mg atoms in the edge plane. Hydration shells on the basal and edge planes of talc were examined to explain the phenomenon.
APPLIED CLAY SCIENCE
(2024)
Article
Chemistry, Physical
Pierre Dramou, Yiyang Sun, Xu Ni, Fangqi Wang, Hua He
Summary: In this study, a magnetic nanocomposite was prepared and used for the separation of rutin from real samples through magnetic solid phase extraction (MSPE). The nanocomposite exhibited high specific surface area, chemical and thermal stability, water solubility, and easy separation in aqueous solution. Characterization and experiments confirmed the successful synthesis and efficient enrichment ability of the nanocomposite.
APPLIED CLAY SCIENCE
(2024)
