Article
Chemistry, Multidisciplinary
Claire Heffernan, Rodrigo Soto, Marko Ukrainczyk, Jacek Zeglinski, Benjamin K. Hodnett, Ake C. Rasmuson
Summary: The study found that the presence of impurities in the solution slows down the growth rate of curcumin spherulites, resulting in rougher and more porous product surfaces. Impurities are incorporated into the solid phase at high impurity concentrations, forming a solid solution.
Article
Environmental Sciences
Younus I. Al-Saady, Manal M. Al-Obaydi, Arsalan Ahmed Othman, Syed E. Hasan
Summary: The text discusses the study of heavy minerals in the sediment of the Lesser Zab River Basin in Iraq, focusing on mineral composition, distribution, origin, and tectonic setting. The sediments are considered immature, consisting mainly of dark and transparent minerals, indicating deposition in an active continental-margin tectonic setting.
ENVIRONMENTAL EARTH SCIENCES
(2021)
Article
Geology
Francois-Xavier Masson, Georges Beaudoin, Denis Laurendeau
Summary: The shape of gold particles can be used to estimate the distance of transport from its primary source, but the classification of gold shape in glacial sediments is currently qualitative and subjective. In this study, microtomography and photogrammetry methods were used to reconstruct the 3D shape of gold particles and accurately quantify shape parameters such as roundness, sphericity, and convexity. Two new shape descriptors were introduced to estimate the ellipticity and sphericity of gold particles.
ORE GEOLOGY REVIEWS
(2022)
Article
Multidisciplinary Sciences
Yong Chen, Satoshi Takeya, Amadeu K. Sum
Summary: Clathrate hydrates are ordered structures stabilized by hydrophobic interactions between water and guest molecules. In this study, an alternative method is proposed to understand the complex structures of clathrate hydrates, revealing the diverse crystalline hydrogen-bonded networks that can be formed. The topological dual relations between clathrate hydrate networks and tetrahedrally close-packed structures provide insights into their nucleation, phase transition, and co-existence mechanisms. Molecular dynamics simulations are employed to explore the intrinsic structural relationships of clathrate hydrates and other unrelated ordered materials.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Ceramics
Omar M. Gomez-Vazquez, Brandon A. Correa-Pina, Luis F. Zubieta-Otero, Angelica M. Castillo-Paz, Sandra M. Londono-Restrepo, Mario E. Rodriguez-Garcia
Summary: In this study, nanometric hydroxyapatite was synthesized by wet chemical precipitation using a calcium hydroxide precursor obtained from eggshells. The synthesized crystals exhibited irregular-spherical morphologies with a diameter ranging from 10 to 90 nm, and contained multiple elements similar to those found in mammalian bones. Commercial synthetic hydroxyapatite, on the other hand, formed micron-sized flakes clusters with only calcium and phosphorus ions present.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Multidisciplinary
Pinqiang Cao, Jianlong Sheng, Henrik Andersen Sveinsson, Jianyang Wu, Fulong Ning
Summary: This study explores the effects of external static electric fields on the structural instability and mechanical properties of methane hydrates using molecular dynamics simulation methods. The results show that strong electric fields can distort and dissociate local water cages in methane hydrates, weakening their mechanical properties. Instability failure modes are attributed to reorientations of water molecules and molecular diffusions.
CRYSTAL GROWTH & DESIGN
(2022)
Article
Chemistry, Multidisciplinary
Burla Sai Kiran, Pinnelli S. R. Prasad
Summary: This study investigates the thermodynamic inhibition capacity of natural biopowders on methane hydrate formation, showing that these biopowders exhibit efficient inhibition at low dosages and play a positive role in the hydrate formation process. The addition of small quantities of biopowders reduces the use of synthetic chemicals and serves to control hydrate formation in real-time applications.
Article
Engineering, Chemical
Yu Wei, Nobuo Maeda
Summary: The memory effect in gas hydrate nucleation refers to the phenomenon that gas hydrates form easier or faster in water with a history of gas hydrate formation. Despite several proposed hypotheses, the cause of the memory effect remains a mystery. This study examines the impact of guest gas supersaturation on the memory effect.
CHEMICAL ENGINEERING SCIENCE
(2023)
Article
Construction & Building Technology
Andreas Picker, Luc Nicoleau, Andre Nonat, Christophe Labbez, Helmut Coelfen
Summary: This work investigates the ongoing processes in the pre- and post-nucleation stage of C-S-H precipitation at pH 12 and pH 13. The presence of calcium induces the condensation of smaller silicate species to larger oligomers during the pre-nucleation stage. By utilizing titration in combination with ion-selective electrodes, the effects of additives on the formation of C-S-H can be monitored and quantified in terms of calcium binding, nucleation times, supersaturation, and post-nucleation behavior, revealing distinct differences between different types of polymers.
CEMENT AND CONCRETE RESEARCH
(2023)
Article
Thermodynamics
Qian Ouyang, Jyoti Shanker Pandey, Nicolas von Solms
Summary: This study investigated the dissociation characteristics of CH4/CO2 hydrates in unconsolidated sediments using slow multistep depressurization. The results showed that CO2 was preferably encaged in hydrate than CH4, especially in unconsolidated sediments. CH4-rich hydrates in unconsolidated sediments could be effectively exploited through multistep depressurization, with higher CH4 recovery at lower depletion pressure.
Article
Engineering, Environmental
M. Fahed Qureshi, Junjie Zheng, Himanshu Khandelwal, Pradeep Venkataraman, Adam Usadi, Timothy A. Barckholtz, Ashish B. Mhadeshwar, Praveen Linga
Summary: This study provides experimental evidence and support for the stability of CO2 hydrates in oceanic sediments, suggesting the possibility of long-term storage of carbon dioxide in this form.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Environmental
Youqiang Liao, Zhiyuan Wang, Xiaohui Sun, Wenqiang Lou, Hui Liu, Baojiang Sun
Summary: The volumetric surface area of hydrates (Ah) in porous media plays a crucial role in hydrate kinetics. This study developed a unified estimation model considering different packing arrangements and structural morphologies to describe the evolution of Ah during hydrate dynamic dissociation. The results showed that sand grain size, packing arrangement, and distance between sand grains affect Ah.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Geochemistry & Geophysics
Joseph A. Graly, Kathy J. Licht, Nicole A. Bader, Christine M. Kassab, David L. Bish, Michael R. Kaplan
Summary: The study analyzes the chemical and mineralogical transformations in Mt Achernar Moraine, finding that salts and carbonate minerals increase with exposure age while clay minerals and amorphous cements break down in smaller proportions. The formation of most minerals is attributed to atmospheric acids reacting with other minerals, and these reactions occur in both subglacial and surface environments.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Materials Science, Multidisciplinary
Tong-yu Liu, Xue Zou, Chao Yang, Ying Pan, Yu-yan Ren, Ying-min Li
Summary: The morphology evolution of primary Mg2Si in Al-Mg2Si composites was investigated using scanning electron microscopy and field emission scanning electron microscope. The results showed that Mg2Si particles only had (100) planes and (111) planes. The faceted Mg2Si had two growing paths, Cube to Truncated Cube and Octahedron to Truncated Octahedron. The surface free energies were determined by First-principle simulation and the validity of the growing path modes was verified.
MATERIALS CHARACTERIZATION
(2022)
Article
Physics, Applied
Abhiram Gundimeda, Mohammadreza Rostami, Martin Frentrup, Alexander Hinz, Menno J. Kappers, David J. Wallis, Rachel A. Oliver
Summary: This study investigated the suitability of Al(x)Ga1-xN nucleation layers (NLs) with varying Al fraction x for the metal organic vapour phase epitaxy of zincblende GaN on (001) 3C-SiC. The results showed that the as-grown NLs exhibited elongated island structures on their surface, which reduced into smaller, more equiaxed islands with increasing AlN composition. High-temperature annealing caused the nucleation islands with low Al fraction to ripen and increase in size, while this effect was less pronounced in samples with higher Al fraction. The compressive biaxial in-plane strain of the NLs increased with increasing AlN composition up to x = 0.29.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Chemistry, Physical
Tandrima Banerjee, Abhijit Samanta, Ajay Mandal
Summary: The rheological behaviors of polymer-surfactant binary mixtures, specifically partially hydrolyzed polyacrylamide (PHPAM) polymer and sodium dodecyl sulfate (SDS) surfactant solutions, were investigated in this study. The addition of salt and alkali was found to have significant effects on the viscosity of these solutions. The findings provide important insights into the understanding of the rheological behaviors of polymer-surfactant mixtures.
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
(2022)
Article
Energy & Fuels
Mohammad Yunus Khan, Ajay Mandal
Summary: The water-alternating-gas (WAG) operating scheme and reservoir permeability heterogeneity are crucial parameters affecting the WAG displacement process. The analytical model developed in this study considers WAG ratio, viscous gravity ratio, and mobility ratio for stratified heterogeneous reservoirs. The study shows that decreasing WAG ratio accelerates incremental oil recovery, especially at high viscous gravity conditions.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Rakesh Kumar Pandey, Anil Kumar Dahiya, Ankesh Kumar Pandey, Ajay Mandal
Summary: An optimized deep learning model has been proposed for automatic interpretation of pressure drawdown tests, achieving high accuracy in predicting parameters from pressure data with minimized manual intervention.
PETROLEUM SCIENCE AND TECHNOLOGY
(2022)
Review
Energy & Fuels
Nilanjan Pal, Xuan Zhang, Muhammad Ali, Ajay Mandal, Hussein Hoteit
Summary: This article reviews the technical advances, challenges, and applicability of CO2 thickeners, particularly for hydrocarbon recovery. Different types of thickeners, including binary co-polymers and small molecule compounds, have been investigated and show promise for CO2 thickening.
Review
Energy & Fuels
Prathibha Pillai, Moumita Maiti, Ajay Mandal
Summary: Ionic liquids are a promising new material for various industrial applications due to their unique structures and properties. This paper reviews the previous research on the application of ionic liquids in the petroleum industry and related processes, including enhanced oil recovery, drilling fluids, gas hydrate, CO2 capture, and flow assurance. The in-depth discussion aims to aid professionals and researchers in understanding the current situation and planning for the future.
Article
Energy & Fuels
Moumita Maiti, Prathibha Pillai, Aniruddha Sharma, Ajoy Kumar Bhaumik, Ajay Mandal
Summary: In this study, the effect of two ionic liquids on the formation and dissociation of hydrates was investigated. The results showed that these ionic liquids were effective in inhibiting hydrate formation both thermodynamically and kinetically. The induction time and formation rate of hydrates were significantly increased in the presence of these ionic liquids compared to pure water. Additionally, the performance of the ionic liquids in hydrate inhibition increased with increasing alkyl chain length.
Article
Chemistry, Physical
Rohit Kumar Saw, Prathibha Pillai, Ajay Mandal
Summary: In recent decades, low salinity water flooding (LSWF) has gained attention for its effectiveness in oil recovery. However, there is a lack of studies in the literature on the potential of using Ionic Liquids (ILs) as candidates for chemical enhanced oil recovery (CEOR) combined with LSWF. This study evaluates the synergistic effect of ILs with varying chain lengths with low saline ion tuned seawater (ITSW) for enhanced oil recovery from carbonate reservoirs. The analysis shows that ILs demonstrate a better synergistic effect with ITSW, reducing interfacial tension, altering rock wettability, and exhibiting less adsorption density at the reservoir temperature. ILs with the longest chain length ([C12mim] [BF4]) show superior properties and significantly increase oil recovery in low saline ITSW.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Energy & Fuels
Dinesh Joshi, Neetish Kumar Maurya, Narendra Kumar, Ajay Mandal
Summary: This study investigates the use of silica nanoparticles, surfactants, and polymers in enhancing oil recovery from oil fields. The synergy of these components is shown to reduce interfacial tension, alter wettability, emulsify, and improve viscosity. Core flooding experiments demonstrate that the nanofluid system provides higher incremental oil recovery, particularly in high permeability cores. Different mechanisms, including wettability alteration and pore plugging, contribute to the increased recovery. This research provides valuable insights into the application of silica nanoparticles with surfactants and polymers as chemical enhanced oil recovery agents.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Chemistry, Physical
Rohit Kumar Saw, Anshuman Singh, Neetish Kumar Maurya, Ajay Mandal
Summary: Low salinity water flooding is cost-effective and environmentally friendly, and the addition of nanoparticles and polymers can significantly increase oil recovery. The viscosity of complex chemical slugs can be increased by adding nanoparticles to polymer solutions. Low salinity water requires a lower concentration of polymer to reach the target viscosity compared to high saline formation water. The addition of nanoparticles reduces interfacial tension and contact angle, leading to higher oil recovery in low salinity water. Injection of low salinity water-based complex fluid results in incremental recovery of OOIP compared to low salinity water and conventional formation water flooding.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Chemistry, Multidisciplinary
Rohit Kumar Saw, Deep Sinojiya, Prathibha Pillai, Shubham Prakash, Ajay Mandal
Summary: This study aims to investigate the synergistic effects of two nonionic surfactants (Tergitol 15-S-12 and PEG 600) on surface properties, including surface tension, interfacial tension (IFT), and wettability alteration, in chemically enhanced oil recovery (EOR). The optimum composition of the surfactant mixture, determined through surface tension measurement, showed a minimum surface tension value of 30.3 mN/m at a concentration of 225 ppm of Tergitol 15-S-12 and 1 wt % of PEG 600. The surfactant mixture exhibited an ultra-low IFT of 0.672 mN/m at optimum salinity. The wettability alteration study revealed a shift in rock wettability from oil-wet to water-wet region through contact angle observations and X-ray diffraction analysis.
Article
Energy & Fuels
Rohit Kumar Saw, Ajay Mandal
Summary: The low salinity water flooding (LSWF) technique is cost-effective and environmentally friendly, but its mechanisms are not yet clear. Recovery in LSWF depends on fluid/fluid and rock/fluid interactions. This study investigated both interactions and found different optimal conditions for improved oil recovery. Rock/fluid interaction showed an incremental recovery of 14%, while fluid/fluid interaction showed an incremental recovery of 7% over simple seawater injection. Results highlight the importance of considering both interactions and wettability alteration in LSWF design.
Article
Chemistry, Physical
Dinesh Joshi, Neetish Kumar Maurya, Ajay Mandal
Summary: The application of graphene oxide nanosheets (GONs) in enhanced oil recovery has been shown to have unique characteristics, including reduction of interfacial tension and alteration of wetting properties. Experimental results demonstrate that GONs can alter the wettability of rock surfaces, leading to increased oil recovery.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Energy & Fuels
Moumita Maiti, Ajoy Kumar Bhaumik, Ajay Mandal
Summary: Hydrate inhibitors are crucial for preventing hydrate growth and ensuring smooth drilling operations. Water-soluble polymers, such as polyvinyl pyrrolidone (PVP K-90), have been found effective in reducing hydrate formation rates. This study investigates the influence of PVP K-90 concentration on hydrate inhibition in predesigned drilling fluids containing methane, ethane, and propane.
GAS SCIENCE AND ENGINEERING
(2023)
Article
Chemistry, Physical
Rohit Kumar Saw, Pranali M. Rane, Dinesh Joshi, Shubham Prakash, Lavisha Jangid, Ajay Mandal
Summary: In recent years, there has been increasing interest in the application of natural surfactants in enhanced oil recovery (EOR) due to environmental concerns. This study introduces a novel non-ionic surfactant synthesized from olive oil and evaluates its properties. The synthesized surfactant showed effective emulsification, wettability modification, and efficient oil displacement. Additionally, the surfactant had a low critical micelle concentration, indicating its ability to reduce interfacial tension.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Energy & Fuels
Moumita Maiti, Prathibha Pillai, Aniruddha Sharma, Ajoy Kumar Bhaumik, Ajay Mandal
Summary: This study investigates the effect of two ionic liquids on the formation and dissociation of gas hydrates and finds that they are effective inhibitors. The inhibition performance of the ionic liquids increases with increasing alkyl chain length.
Article
Engineering, Chemical
Yongxiang Wu, Nguyen Thi Hong Nhung, Deqian Zeng, Nengneng Luo, Akira Otsuki, Gjergj Dodbiba, Toyohisa Fujita
Summary: This study proposed a novel method for synthesizing flower-like vaterite calcium carbonate using nanobubble-containing ethanol and water mixed solution as the solvent and discussed the formation mechanism of vaterite with different shapes. The synthesized vaterite has significant practical interest in the integrated treatment of wastewater contaminated by heavy metals with effective Cd(II) removal, providing a promising field for studying heavy metal and pollutant adsorption in the liquid phase.
ADVANCED POWDER TECHNOLOGY
(2024)
Article
Engineering, Chemical
Jian Gong, Lipo Cheng, Ming Liu, Jie Jiang, Xiaoduo Ou
Summary: This study investigates the effects of particle shape on the collapse of granular columns using the discrete element method. The results show that particle shape has a significant impact on deposition morphology, energy evolution, and mechanical coordination number. Sphericity and angularity are identified as the most important macroscale factors, while roughness has a weaker microscale influence.
ADVANCED POWDER TECHNOLOGY
(2024)
