Article
Energy & Fuels
Nithin B. Kummamuru, Geert Watson, Radu-George Ciocarlan, Sammy W. Verbruggen, Pegie Cool, Pascal Van der Voort, Patrice Perreault
Summary: This study explores the potential of two hydrophobic porous materials in promoting methane clathrate formation. The results show that both materials can facilitate the formation of methane clathrates under mild operating conditions and have high methane storage capacities. Overall, the study concludes that these materials are effective promoters of methane clathrates, making clathrate-based methane storage and transport technology industrially viable.
Article
Thermodynamics
Lifu Zhang, Zhe Wang, Wanjun Lu, Yahui Li
Summary: This paper investigates the mass transfer process of methane in aqueous solution under the effect of temperature gradient using quantitative Raman spectroscopy. It is observed that thermodynamic factors play a dominant role in the diffusion of CH4. The Soret and thermal diffusion coefficients of dissolved CH4 are calculated within a certain range of pressure and temperature. Based on the temperature gradient distribution in a specific geological body, the CH4 solubility distribution is estimated and provides new insights into the formation mechanism of CH4 accumulation, leakage, and related geological disasters.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Energy & Fuels
Xin Zheng, Limin Wang, Zhi Li, Weixin Pang, Qingping Li, Guangjin Chen, Bei Liu
Summary: This study investigated the dissociation and re-formation of methane hydrates in silica-slit and bulk water using molecular dynamics simulations. The results showed that methane hydrates dissociate layer-by-layer with the generation of nanobubbles. The hydrophilic quartz surface was found to facilitate the formation and stable existence of ordered structures of interfacial water molecules. In the process of hydrate regeneration, intact/semi hydrate cages were beneficial for re-formation, while long-time decomposition induced large nano-bubbles that hindered memory effect and prolonged the induction time. The loci of hydrate re-crystallization were determined by the concentration of dissolved methane gas and the diffusion of water molecules.
Article
Energy & Fuels
Zhenchao Li, Yajun Deng, Shihang Rao, Hailong Lu
Summary: Molecular dynamics simulations were used to investigate the formation and distribution of hydrates in kaolinite slit pores with methane gas bubbles adsorbed on one surface. The results indicate that hydrates nucleate in the solution in pores and then grow into hydrate shells around methane gas bubbles, hindering methane diffusion. Additionally, the adsorption of methane on siloxane surfaces promotes its dissolution, benefiting hydrate formation. However, in siloxane-siloxane pores, the strong adsorption of siloxane surface forms layer-like bubbles with low methane concentration, inhibiting hydrate formation.
Article
Chemistry, Physical
Azeezat Ali, Alberto Striolo, David R. Cole
Summary: Geological carbon sequestration in deep saline aquifers is crucial for reducing greenhouse gas emissions, but the solubility of CO2 in water is affected by various factors. Research indicates that the solubility of CO2 is lower in calcite pores and decreases as the pores narrow. Simulation results also suggest that the presence of ions influences the solubility of CO2 in confined water.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Energy & Fuels
Hongyang Zhang, Xiaoming Luo, Donghai Yang, Kouqi Liu, Quan Xie, Rui Diao
Summary: The dissolution of hydrogen in caprock nanopores depends on the pore size and the presence of water molecules. Hydrogen loss mainly occurs in smaller water-saturated pores. The solubility of hydrogen and methane is affected by the presence of brine, with higher salinity reducing hydrogen loss.
Article
Chemistry, Multidisciplinary
Lanyun Wang, Xiaoran Lu, Yongliang Xu
Summary: This study found that adding 5-10% RNS-A can shorten the induction time during CO2 hydrate formation, and 6% RNS-A showed the best gas consumption and reaction time, making it the optimal concentration for CO2 capture and sequestration.
Article
Engineering, Environmental
Wenhui Li, Yiling Nan, Qing You, Zhehui Jin
Summary: This study used molecular dynamics simulations to investigate the effects of salinity and pH on CO2 solubility in brine in silica nanopores under typical geological conditions. It was found that low salinity and low pH conditions are favored for geological CO2 sequestration by solubility trapping in tight formations.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Physical
S. Schneider, M. Brodrecht, H. Breitzke, T. Wissel, G. Buntkowsky, H. S. Varol, R. Brilmayer, A. Andrieu-Brunsen, M. Vogel
Summary: We used nuclear magnetic resonance to investigate the dynamics of LiCl-7H(2)O and LiCl-7D(2)O solutions in silica nanopores. We found that the solution dynamics are slower in functionalized pores compared to pristine pores. Bimodal dynamics of water and lithium ions may be observed when the exchange between different confinement regions is slow at reduced temperatures. We suggested that steric hindrance and electrostatic interactions in functionalized pores interfere with the formation of a defined electric double layer, resulting in overall slower dynamics.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Construction & Building Technology
Maya Harris, Grace Simpson, Karen Scrivener, Paul Bowen
Summary: Various methods have been developed to synthesize C-S-H, but this paper focuses on a reliable method to produce single-phase C-S-H with Ca:Si molar ratios between 1 and 2 by controlling reactant concentrations, temperature, pH, and mixing conditions to ensure homogeneous precipitation. Additionally, guidelines on collection, drying, storage, and handling are provided.
CEMENT AND CONCRETE RESEARCH
(2022)
Article
Biochemical Research Methods
Ang Li, Xiaodong He, Jing Wu, Juan Zhang, Guoyong Xu, Bing Xu, Gang Zhao, Zuojun Shen
Summary: In this study, a ultra thin filtering membrane with slit-shaped pores was developed for highly efficient separation of circulating tumor cells (CTCs) from whole blood. The membrane demonstrated high capture efficiency, high white blood cell depletion, and high viability. Additionally, the microfluidic chip successfully applied to clinical CTC-based liquid biopsy technology.
Article
Engineering, Chemical
Jing-Jing Guo, Wei Xiong, Qiu-Yun Hu, Ye Tian, Xiao He, Lie-Hui Zhang, Yu-Long Zhao, Tao Zhang
Summary: This paper presents a new phase equilibrium calculation framework for confined fluids in nanopores. It solves the nonconvergence problem in two-phase equilibrium calculations and improves the calculation methods for negative pressure and negative roots.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Chemistry, Multidisciplinary
Wenhui Li, Mingshan Zhang, Yiling Nan, Wanying Pang, Zhehui Jin
Summary: This study investigated the effects of kerogen maturity and pore size on CO2 storage mechanism and capacity in water-filled kerogen nanopores using molecular dynamics simulation. The results showed that CO2 storage mechanisms differ in pores of different sizes, with enhanced storage capacity in 1 nm pores due to strong interactions between kerogen and CO2. Additionally, CO2 clusters near the kerogen surface in larger pores increased overall CO2 storage capacity.
Article
Chemistry, Multidisciplinary
Rui Zhang, Shimin Liu, Long Fan, Tomasz P. Blach, Guijie Sang
Summary: This study used contrast-matching small-angle neutron scattering to quantify gas storage mechanisms and capacity in three shale samples at elevated high pressure. The results showed a variation of average adsorbed phase density in open pores over the measured pressure range. This finding is significant for screening potential targeted shale reservoirs and maximizing methane storage and long-term CO2 sequestration.
ENVIRONMENTAL SCIENCE-NANO
(2021)
Article
Engineering, Chemical
Zhixia Deng, Shuanshi Fan, Yanhong Wang, Xuemei Lang, Gang Li
Summary: The addition of stainless steel fiber in the solution for gas storage in hydrates improves the heat removal issue during hydration process, enhances gas storage speed and capacity by increasing nucleation sites. Longer stainless steel fibers show higher gas storage capacity and methane uptake rate compared to shorter fibers. Stainless steel fiber combined with sodium dodecyl sulfate demonstrates excellent gas storage performance with reduced usage amount and increased volume gas storage density.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2022)