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
Green & Sustainable Science & Technology
Hongsheng Dong, Jiaqi Wang, Zhuoxue Xie, Bin Wang, Lunxiang Zhang, Quan Shi
Summary: This review discusses the potential applications of gas hydrates in energy and environmental fields, highlighting their advantages in gas storage, gas separation, wastewater treatment, and other areas. Challenges, limitations, and future directions for each application are also explored in the paper.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2021)
Article
Chemistry, Multidisciplinary
Dmitry A. Strukov, Tatyana P. Adamova, Andrey Y. Manakov
Summary: The results of visual studies show that during the growth of methane and carbon dioxide hydrates in acid and alkali solutions, hydrate films form at the water-gas interface and on the walls of the reactor. Additionally, hydrate films also grow on the free walls of the reactor, possibly formed from wetting water films on the walls. This study also observes the growth of relatively large hydrate agglomerates directly from the reactor walls, potentially facilitated by film transfer of water between the hydrate films and the walls.
CRYSTAL GROWTH & DESIGN
(2023)
Article
Energy & Fuels
Yue Ma, Qiang Gao, Jian Guan, Chi Zhang, Jianzhong Zhao
Summary: In this study, experiments were conducted to dissociate mixed CO2 + CH4 hydrates by depressurization and thermal stimulation. The kinetics, fluid production behavior, heat transfer characteristics, and separation factors were examined during the hydrate formation and dissociation processes. The results showed consistent gas consumption and phase saturation, with a stochastic induction time ranging from 38 to 58 minutes. The hydrate exhibited a strong selectivity to CH4 during the gas mixture hydrate formation process, and the gas production increased with decreasing depressurization pressure.
Article
Energy & Fuels
Tianyi Hua, Maisha T. Ahmad, Tenzin Choezin, Ryan L. Hartman
Summary: This study examines the influence of subtle temperature fluctuations on the dynamic stability of methane hydrate deposits, showing that bioreaction kinetics is dominated by endothermic methanogenic metabolism with a fragile tolerance to temperature increases. Feather duster worms stabilize the hydrates by selectively consuming methanotrophs, preventing potential system overtake by their exothermic metabolism. The research suggests that historical ocean temperature records and gas hydrate inventory estimates indicate risks to hydrate deposits as deep as 560 m below sea level, with the stability zone expected to retreat deeper as ocean temperatures rise.
Article
Energy & Fuels
O. S. Gaidukova, V. V. Dorokhov, S. Y. Misyura, V. S. Morozov, N. E. Shlegel, P. A. Strizhak
Summary: The dissociation and combustion of methane hydrate samples were experimentally studied under different thermal conditions. The synergistic effects of simultaneously dissociating methane and carbon dioxide hydrates were analyzed. It was found that ignition of methane hydrate granules was faster than tablets, and increasing the combustion chamber temperature improved the ignition performance of tablets.
Review
Biochemistry & Molecular Biology
Mar'atus Sholihah, Wu-Yang Sean
Summary: Investigations on the structures, formation mechanisms, and dissociation of gas hydrates were conducted using modern instruments and numerical analyses. The characteristics of gas hydrates are multi-phase and multi-component complexes, emphasizing the importance of comprehensive investigations. The interrelationship between parameters such as temperature, pressure, and concentration is crucial for accurate production processes and the recovery of gas hydrates.
Article
Engineering, Environmental
Yu Feng, Yang Zhao, Yuze Han, Yanzhen Liu, Lunxiang Zhang, Jiafei Zhao, Lei Yang, Yongchen Song
Summary: The formation and dissociation behavior of CO2 hydrates in the presence of clay particles were investigated using low-field nuclear magnetic resonance. It was found that montmorillonite particles significantly promoted the conversion of water into hydrate, while illite particles had a weaker promoting effect. According to the DLVO theory, the total interaction potential between montmorillonite particles was much higher than that between illite particles.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Asheesh Kumar, Hari Prakash Veluswamy, Sanat Kumar, Rajnish Kumar, Praveen Linga
Summary: Clathrate hydrate-based sustainable technologies, such as solidified natural gas (SNG) technology, show great potential for storing natural gas. Experiments on mixed hydrates in a seawater environment reveal the promotional effect of seawater on hydrate formation and suggest the economic feasibility of using natural seawater to enhance SNG technology.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Energy & Fuels
Shashika Gajanayake, Ranjith Pathegama Gamage, Pabasara Wanniarachchige
Summary: This study aims to investigate the formation characteristics of hydrate in a porous medium under different confining conditions, focusing on the effect of confining pressure on hydrate nucleation, growth, and saturation. The experimental results demonstrate the random nature of hydrate formation and the direct relationship between pressure decrease and hydrate saturation. Higher confining pressure conditions contribute to greater hydrate saturation within the porous medium.
Article
Thermodynamics
Junghoon Mok, Wonjung Choi, Yongwon Seo
Summary: This study closely investigated the dissociation behavior and time-dependent guest distributions of methane (CH4) hydrate after injecting gaseous N-2 at different temperatures and pressures. Results showed that higher temperature and lower N-2 injecting pressure accelerated the dissociation kinetics of CH4 hydrate. Raman and NMR spectra confirmed the immediate capture of N-2 molecules in hydrate cages at 268.8 K, with N-2 incorporation increasing at higher pressure. C-13 NMR spectra revealed N-2-induced structural transitions in hydrates and the preferential capture of N-2 in small cages. The findings provide insights into the roles of N-2 molecules in inhibitor injection and CH4 - CO2 + N-2 replacement methods for gas hydrate exploitation.
Article
Chemistry, Multidisciplinary
Lihua Wan, Xiaoya Zang, Juan Fu, Xuebing Zhou, Jingsheng Lu, Jinan Guan, Deqing Liang
Summary: Experimental evidence showed that confined methane hydrates in nanosilica gel can dissociate into ultra viscous low-density liquid water and methane gas. The dissociation process depends on the phase state of water.
Article
Multidisciplinary Sciences
Dongliang Jin, Benoit Coasne
Summary: By using advanced molecular modeling techniques and mesoscale thermodynamic approach, the mechanisms involved in the formation/dissociation of methane hydrate confined at the nanometer scale have been unraveled. The phase stability of confined methane hydrate is shown to be restricted to a narrower temperature and pressure domain compared to its bulk counterpart. The findings provide insights into the faster kinetics observed in experiments on confined gas hydrates and offer a means to rationalize and predict methane hydrate formation in any porous media.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Environmental Sciences
D. V. Antonov, I. G. Donskoy, O. S. Gaidukova, S. Ya. Misyura, V. S. Morozov, G. S. Nyashina, P. A. Strizhak
Summary: The dissociation and combustion behavior of double gas hydrates in a tubular muffle furnace were studied to improve combustion efficiency and reduce gas emissions. The experiments and simulations showed that double gas hydrates have more stable combustion and their dissociation rate increases with temperature. The presence of heavy hydrocarbons in double gas hydrates reduces unburned CH4 emissions, but increases CO2 emissions. Furnace temperature and gas hydrate composition also impact anthropogenic gas emissions.
ENVIRONMENTAL RESEARCH
(2022)
Article
Energy & Fuels
Yingmei Wang, Aili Niu, Wenze Jiao, Ji Chen, Peng Zhang, Jinping Li
Summary: Carbon dioxide hydrate formation rate is improved by using different accelerator systems. The combination of nanographite-TBAB and SDS-TBAB shows better performance in reducing the nucleation time. TBAB shows the best nucleation amount, formation rate, and conversion rate among the single acceleration systems.
Article
Chemistry, Physical
Nikita Penkov, Nadezda Penkova
Summary: The study investigates the hydration shells of ATP in water and MgCl2 solutions using terahertz time-domain spectroscopy and dynamic light scattering. It was found that the water structure in the ATP water solution is distorted, indicating tightly bound water molecules due to the hydration of phosphate groups. On the other hand, when ATP binds to Mg2+ ions, an arranged structure with increased hydrogen bond number is observed, leading to a different hydration shell compared to unaltered water. Additionally, the hydrodynamic diameter of ATP increases by 0.5 nm after Mg2+ binding, and there is evidence of the formation of a layer with a refraction coefficient similar to water, suggesting an increased number of hydrogen bonds in the hydration shell.
JOURNAL OF PHYSICAL CHEMISTRY B
(2021)
Article
Chemistry, Multidisciplinary
Nikolai F. Bunkin, Alexey V. Shkirin, Nikita V. Penkov, Mikhail V. Goltayev, Pavel S. Ignatiev, Sergey V. Gudkov, Andrey Yu. Izmailov
Summary: The study investigated the volume number density of ion-stabilized gas nanobubbles (bubstons) and found that it is influenced by the type of gas and the pressure created by the gas in deionized water and saline solution. It was observed that the growth rate of bubston density is controlled by the molecular polarizability of dissolved gases, with the highest densities obtained for gases with dipole moments. Additionally, the addition of external ions at fixed pressure and gas molecular polarizability leads to a sharp increase in bubston content.
FRONTIERS IN CHEMISTRY
(2021)
Article
Medicine, Research & Experimental
Natalia Bobkova, Daria Y. Zhdanova, Natalia Belosludtseva, Nikita Penkov, Galina D. Mironova
Summary: The study showed that intranasal administration of mitochondria improved spatial memory in mice with Alzheimer's type degeneration. Colocalization of allogeneic mitochondria with markers of astrocytes and neurons was observed in hippocampal cell culture.
EXPERIMENTAL BIOLOGY AND MEDICINE
(2022)
Article
Biochemistry & Molecular Biology
Anastasia Shishkina, Alexander A. Ksenofontov, Nikita Penkov, Mikhail V. Vener
Summary: The study of aqueous solutions of sodium diclofenac explores the equilibrium state and spectral characteristics, demonstrating the importance of combining spectroscopic methods with computational simulations. Additionally, a hypothesis regarding the mechanism of action of sodium diclofenac in high dilutions was proposed through the combined application of experimental and calculation methods.
Article
Energy & Fuels
Anatoliy N. Nesterov, Aleksey M. Reshetnikov
Summary: The study investigates the effect of a mixed NaCl + SDS additive on methane hydrate formation and found that the pressure and morphology of the hydrate film in NaCl solution under static condition determine the growth of methane hydrate. Contrary to existing concepts, SDS micelles did not form in the presence of NaCl, but evidence of SDS hydrate formation was observed.
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2022)
Article
Biochemistry & Molecular Biology
Vlada S. Starinets, Dmitriy A. Serov, Nikita Penkov, Natalia Belosludtseva, Mikhail Dubinin, Konstantin N. Belosludtsev
Summary: In this study, the effect of alisporivir on mitochondrial dysfunction in mouse lung endothelial cells under hyperglycemic conditions was investigated. The results showed that alisporivir can restore cell viability, membrane potential, and MPT pore opening activity to normal levels, as well as inhibit mitochondrial autophagy and the upregulation of the Drp1 gene caused by hyperglycemia.
BIOCHEMISTRY-MOSCOW
(2022)
Article
Physics, Multidisciplinary
N. F. Bunkin, P. N. Bolotskova, V. A. Kozlov, M. A. Okuneva, N. Penkov
Summary: The interaction between Nafion polymer membrane and different amino acids was investigated using photoluminescence spectroscopy. It was found that the interaction of amino acids with the membrane surface led to luminescence quenching. Different dynamic modes were observed during Nafion membrane swelling in a suspension of amino acids with different isotopic compositions.
PHYSICS OF WAVE PHENOMENA
(2022)
Article
Physics, Multidisciplinary
N. Penkov, N. A. Penkova, V. Lobyshev
Summary: Based on experimental analysis, it was found that the binding of ATP with Mg2+ or Ca2+ leads to weakened water binding in the hydration shell, while an increased number of hydrogen bonds are formed in the hydration shell of Mg·ATP. The hydrodynamic diameter of Mg·ATP is larger than that of ATP and Ca·ATP.
PHYSICS OF WAVE PHENOMENA
(2022)
Article
Chemistry, Multidisciplinary
Tatyana P. Adamova, Dmitry A. Strukov, Andrey Yu. Manakov, Anatoly N. Nesterov
Summary: It has been found that hydrated crystals of sodium dodecyl sulfate (SDS) can significantly accelerate the nucleation of methane gas hydrate from dilute SDS solutions. This finding provides important details on the mechanisms of hydrate formation from SDS solutions and could potentially lead to the development of a new class of kinetic promoters for hydrate formation.
MENDELEEV COMMUNICATIONS
(2022)
Article
Environmental Sciences
Nikita V. Penkov
Summary: Liquids prepared by sequential multiple dilutions with mechanical action can influence adjacent solutions through infrared emission without direct contact. The magnetic field and mechanical treatment intensity affect the emission of HD antibody solutions and their impact on water. The non-contact effect depends on the magnetic field treatment and the intensity of shaking during preparation. The emission intensity of water changes similarly in the presence of HD antibody and a magnetic field.
Article
Optics
Nikita V. Penkov
Summary: The purpose of this study is to establish the relationship between the parameters of THz dielectric permittivity and the number of free water molecules. A theoretically justified approach for calculating the proportion of free water molecules in solutions is presented, along with the comparisons to other approaches. The study provides a reliable method for determining the number of free water molecules in aqueous solutions.
Article
Biochemistry & Molecular Biology
Natalia V. V. Belosludtseva, Dmitriy A. A. Serov, Vlada S. S. Starinets, Nikita V. V. Penkov, Konstantin N. N. Belosludtsev
Summary: The study investigated the impact of high glucose levels on the morphology of individual mitochondria and the state of mitochondrial networks in primary mouse lung microvascular endotheliocytes and human dermal fibroblasts. The results showed that high glucose induced changes in mitochondria size, number, and connectivity in a cell-specific manner. Furthermore, the gene expression analysis revealed altered expression of proteins associated with mitochondrial biogenesis and mitophagy. These findings are important for the development of mitochondria-targeted therapies for hyperglycemic and diabetic conditions.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Biochemistry & Molecular Biology
Olga A. Krasnova, Vladislav V. Minaychev, Vladimir S. Akatov, Roman S. Fadeev, Anatoly S. Senotov, Margarita I. Kobyakova, Yana V. Lomovskaya, Alexey I. Lomovskiy, Alyona I. Zvyagina, Kirill S. Krasnov, Yuriy V. Shatalin, Nikita V. Penkov, Vitaly K. Zhalimov, Maxim V. Molchanov, Yuliya A. Palikova, Arkady N. Murashev, Eugeny I. Maevsky, Irina S. Fadeeva
Summary: Squalene emulsions containing turpentine oil were prepared by high-pressure homogenization, and the safety and effectiveness of the emulsions were studied. All emulsions showed high safety profiles regardless of turpentine oil concentration. However, the emulsions exhibited dose-dependent effects in terms of efficiency and storage stability, with the squalene emulsion containing 1.0% turpentine oil showing the most pronounced adjuvant and cytokine-stimulating activity as well as stability indicators when stored at room temperature. It can be concluded that the squalene emulsion with 1% turpentine oil is a stable, monomodal, and reliably safe ultradispersed emulsion with potential immunopotentiating properties.
Article
Optics
Nikita V. Penkov
Summary: The phenomenon of microheterogeneities (MHs) in solutions, which are areas of increased concentration of one of the components, has been studied using terahertz time-domain spectroscopy. The hydration characteristics of MHs in aqueous solutions of three sugars were compared, and it was found that MHs have stronger water binding. Moreover, changes in hydrogen bonds and the increase in free water molecules were observed in the fructose solution.
Article
Biochemistry & Molecular Biology
Alexander G. Bobylev, Elmira Yakupova, Liya G. Bobyleva, Nikolay Molochkov, Alexander A. Timchenko, Maria A. Timchenko, Hiroshi Kihara, Alexey D. Nikulin, Azat G. Gabdulkhakov, Tatiana N. Melnik, Nikita Penkov, Michail Y. Lobanov, Alexey S. Kazakov, Miklos Kellermayer, Zsolt Martonfalvi, Oxana Galzitskaya, Ivan M. Vikhlyantsev
Summary: The giant protein titin, found in striated and smooth muscles, undergoes nonspecific amyloid aggregation in vitro. The high-molecular-weight isoform of chicken smooth-muscle titin forms amorphous amyloid aggregates with a quaternary cross-beta structure. These aggregates do not affect the secondary structure of the protein and can partially disaggregate at higher ionic strengths. This study suggests that specific domains/segments of titin are involved in the amyloid aggregation process. Understanding amyloidogenesis could be expanded by studying titin as an object of interest.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
