Article
Chemistry, Physical
Marlene Schmid, Johann Plank
Summary: Polycarboxylate (PCE) comb polymers were investigated as dispersants for suspensions of individual calcined clay samples. Results showed that the methallyl ether (HPEG) based PCE outperformed the methacrylate ester (MPEG) based PCE, but meta illite could not be satisfactorily dispersed.
APPLIED CLAY SCIENCE
(2021)
Article
Soil Science
Thadeu Rodrigues de Melo, Alex Figueiredo, Joao Tavares Filho
Summary: An increase in organic matter content can stabilize macmaggregates in soils, but it can also inhibit the flocculation of suspended clay. When water-stable macroaggregates break down, the released clay may have imbalanced charges, making flocculation unlikely.
SOIL & TILLAGE RESEARCH
(2021)
Article
Chemistry, Physical
Jaber Taheri-Shakib, Mahyar Rajabi-Kochi, Akram Shabani, Ali Esfandiarian, Mohammad Afkhami Karaei, Hamid Sangbor
Summary: This study investigates the effect of four asphaltene samples on the wettability alteration of carbonate reservoir rock. The wettability of each core is evaluated using relative permeability and contact angle. The composition of asphaltene affects the degree of wettability, and sulfur and oxygen play important roles in the adsorption properties of asphaltene. The relationship between surface wettability and electrostatic properties is also explored, and calcium is found to be correlated with the level of surface wettability. Scanning electron microscopy and elemental analysis are used to study the dispersion of elements on the surface after wettability alteration.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Review
Chemistry, Physical
Shiva Mohammadi-Jam, Kristian E. Waters, Richard W. Greenwood
Summary: This article reviews the use of the electroacoustic technique in determining the zeta potential of concentrated aqueous suspensions and emphasizes the importance of identifying the isoelectric points for colloidal stability and processing. The application of the technique in polymer lattices is also summarized.
ADVANCES IN COLLOID AND INTERFACE SCIENCE
(2022)
Article
Chemistry, Physical
Huafu Pei, Siqi Zhang
Summary: This study utilized molecular dynamics to investigate the zeta potential and shear plane position of montmorillonite. The results showed a linear relationship between the zeta potential position and the Debye length, as well as a linear dependence on ionic strength on a logarithmic scale.
APPLIED CLAY SCIENCE
(2021)
Article
Geosciences, Multidisciplinary
Miftah Hidayat, Mohammad Sarmadivaleh, Jos Derksen, David Vega-Maza, Stefan Iglauer, Jan Vinogradov
Summary: The zeta potential of clayey sandstone saturated with NaCl solutions at supercritical CO2 conditions differs significantly from measurements conducted under ambient conditions or with clean sandstones, mainly due to the presence and exposure of clays and feldspars.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Chemistry, Applied
Chadha Mejri, Walid Oueslati, Abdesslem Ben Haj Amara
Summary: The study found that the clay material has an interstratified hydration character for both studied exchangeable cations, described probably by a partial cation exchange process, regardless of the solid/liquid ratio. The theoretical mixed layer structure (MLS) suggests the coexistence of more than one cristallite species saturated by more than one exchangeable cations, indicating a partial saturation of all exchangeable sites. The obtained optimal structural parameter values allowed the researchers to follow the evolution of several intrinsic properties versus the applied constraint strength.
ADSORPTION SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Applied
Chadha Mejri, Walid Oueslati, Abdesslem Ben Haj Amara
Summary: This study aims to explore the interactions of structural changes, hydration stability, and evolution of montmorillonite porosity under external applied constraints.
ADSORPTION SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Physical
Faisal Ur Rahman Awan, Ahmed Al-Yaseri, Hamed Akhondzadeh, Stefan Iglauer, Alireza Keshavarz
Summary: The study explored the zeta-potential of sandstones with different clay contents in the presence of brine, showing that clay-rich sandstone had lower zeta potentials than clay-poor sandstone at tested salinities. Surfactant SDBS was found to reduce zeta potential and increase repulsive forces, making the rock more hydrophilic. Additionally, electrophoretic zeta potentials were higher than streaming zeta potentials in the experiments.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Biochemistry & Molecular Biology
Marek Kosmulski, Marta Kalbarczyk
Summary: A sufficient amount of ionic surfactants can disperse silica particles in water-glycol mixtures with a zeta potential of around 100 mV. The addition of HCl had little effect on the zeta potential, while excess NaOH induced a zeta potential of about -80 mV in 50% EG and less significant effect in 50% PG. Excess CTMABr induced a zeta potential of about +100 mV in both 50% EG and PG, while excess SDS induced a zeta potential of about -80 mV in both 50% EG and PG.
Article
Energy & Fuels
Ato Kwamena Quainoo, Berihun Mamo Negash, Cornelius B. Bavoh, Alamin Idris
Summary: The study showed that Proline had the best inhibitory effect on montmorillonite, reducing swelling by 22.5%, significantly better than KCl's 17.8% reduction. Amino acids improved the base fluid properties and decreased the clay mineral surface hydrophilicity, reducing the attraction between water molecules and the mineral.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Materials Science, Multidisciplinary
Koji Yamamoto, Yoshihiro Miyauchi, Masanari Hirahara, Yasushi Umemura
Summary: The Langmuir film formation behavior of a long hydrocarbon chain trimethylammonium cation (C(30)TMA(+)) was investigated. Methanol was added to weaken the hydrophobic interactions between the hydrocarbon chains. It was found that the surface pressure at the collapse point decreased with increasing methanol concentration, indicating the weakening of the hydrophobic interaction.
Article
Chemistry, Physical
Maryam H. Derkani, Nathan J. Bartlett, Gaone Koma, Laura A. Carter, Daniel A. Geddes, John L. Provis, Brant Walkley
Summary: The influence of different alkali and alkaline earth cations and solution pH on the surface interactions of metakaolin particles with SNSFP was investigated. Ca2+ was found to be the most effective alkaline earth cation mediator in providing a dispersion effect in metakaolin dispersed in aqueous NaOH and SNSFP mixtures, while Mg2+ was the most effective in aqueous KOH and SNSFP mixtures. The study revealed the mechanisms of colloidal stability and fluidity in metakaolin-based materials.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Biochemical Research Methods
Amitava Dutta, Apurba Kumar Santra, Ranjan Ganguly
Summary: This paper presents a numerical analysis of the effects of non-Newtonian background electrolyte (BGE) on temperature gradient focusing (TGF) in a microchannel. The study investigates the influence of wall zeta potential and flow behavior index (n) of BGE on flow, thermal, and species concentration profiles. The results show that the maximum concentration enhancement can reach 134-280-fold when the BGE displays Newtonian rheology.
Article
Construction & Building Technology
My Ngoc-Tra Lam, Duc-Trong Nguyen, Duy-Liem Nguyen
Summary: The study found that the flow spread of mortars made of clay brick waste powder and ceramic waste aggregate decreased, while the compressive strength noticeably improved in the long term.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
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)