Study of Time-Varying Laws of Stability and Wettability of SiO<sub>2</sub>–H<sub>2</sub>O Nanofluids with Different Particle Sizes

Zhao, Jiajia; Tian, Shixiang; Xie, Honggao; Zhang, Xuan

doi:10.1021/acs.iecr.3c02110

Cited by 16 publications

(4 citation statements)

References 60 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The different rates at which the solids sink reflect the difference in the product accumulated in each cycle, with much slower sedimentation for the second cycle compared to the first (0.034 cf 0.29 mm·min –1 ). For particles with similar densities and morphologies, larger particles sink faster than smaller particles . This suggests that in the present reactions, larger particles are accumulated during the first compared to the second sedimentation event and at higher compared to lower concentrations.…”

Section: Resultsmentioning

confidence: 69%

“…For particles with similar densities and morphologies, larger particles sink faster than smaller particles. 31 This suggests that in the present reactions, larger particles are accumulated during the first compared to the second sedimentation event and at higher compared to lower concentrations. In addition to the average, the uniformity of particle sizes can also be determined.…”

Section: ■ Experimental Methodsmentioning

confidence: 66%

See 1 more Smart Citation

Real-Time Multiscale Imaging of Heterogeneous Multistage Reactions: Insights into Nanoscale TiO₂ Synthesis

Sanchez Monserrate,

Beauvais,

Vornholt

et al. 2024

J. Am. Chem. Soc.

View full text Add to dashboard Cite

Hydrothermal methods are widely used to synthesize functional inorganic materials. The interplay between the reactive species, solution chemistry, and the nanoscale product makes it challenging to control the reaction pathway to achieve a uniform product. Here, we resolve the heterogeneity that arises during hydrothermal synthesis across different length scales. We combine spatially resolved in situ X-ray pair distribution function (PDF) and small-angle X-ray scattering analysis, which are sensitive to structure on the atomic and nanoscale, with a novel time-lapse optical imaging strategy that reveals heterogeneity and phase separations across the entire reaction. For TiO 2 synthesis via hydrothermal hydrolysis of TiCl 4 , we identify multiple cycles of TiO 2 formation and separation that contribute to nonuniformity in the polymorphic product. The PDF data show that the characteristics of TiO 2 formed during each formation−separation cycle differ, contributing to the ongoing challenge of precisely identifying reaction controls. The imaging strategy pioneered here provides an efficient in situ means to systematically compare how the reaction evolves under different chemical conditions, thereby advancing our understanding of functional inorganic material synthesis.

show abstract

Section: Resultsmentioning

confidence: 69%

Section: ■ Experimental Methodsmentioning

confidence: 66%

Real-Time Multiscale Imaging of Heterogeneous Multistage Reactions: Insights into Nanoscale TiO₂ Synthesis

Sanchez Monserrate,

Beauvais,

Vornholt

et al. 2024

J. Am. Chem. Soc.

View full text Add to dashboard Cite

show abstract

“…As mentioned above, a lot of research work has been carried out and more results have been achieved on the effect of the moisture content on coal gas desorption and emission characteristics. − Most of the experiments were conducted on coals with the same degree of metamorphism, and no systematic research has been carried out on coals across the rank range. − Based on the existing results, this paper carries out a study on the influence of different moisture contents on the initial velocity of gas emission in the coal body for three different metamorphic degree coal samples (lignite, bituminous coal, and anthracite) to reveal the mechanism of the influence of moisture in depth. The results of the study are of great significance for the prevention and control of gas hazards, outburst prediction, and risk assessments. − …”

Section: Introductionmentioning

confidence: 99%

Investigation on the Gas Emission Law of Water-Containing Coal across the Rank Range

Wang,

Huang,

Liu

et al. 2024

ACS Omega

View full text Add to dashboard Cite

Water commonly occurs in coal reservoirs, and it can block the gas flow channels. This has a significant influence on methane transportation within coal. To reveal the gas emission law of water-containing coal across the rank range, three typical coal samples with different coal ranks covering lignite to anthracite were selected in this work. The initial velocity of gas emission (ΔP) under the effect of moisture was measured, and the combination of scanning electron microscopy and mercury injection method was adopted to study the pores and fracture characteristics within coal. Distribution features of oxygen-containing groups in coal were explored by X-ray photoelectron spectroscopy. The microscopic influence mechanism of the water content on ΔP in coal was also comprehensively elucidated. The experimental results show that the moisture content has an obvious inhibitory effect on the ΔP of coal, but the degree of influence on different coal rank samples was different. As the pore space of anthracite (sample XJ) is developed with numerous gas transportation channels, the ΔP has less changes at the lower moisture content (<4.36%). When the moisture content is >4.36%, a large number of water molecules will band together to form water clusters, hindering the gas release, thus greatly reducing the ΔP. However, the change of lignite (sample SL) shows an inverse trend to that of anthracite. Its ΔP is sensitive to the moisture content due to the small number of pores and low porosity. In addition, a great number of oxygen-containing groups in lignite can also provide good surface hydrophilicity for water molecules, and even a small amount of the moisture content (<3.21%) can block most of the pore and facture channels within coal, leading to the remarkable decrease in ΔP. For bituminous coal (sample ML), the distribution of pores and oxygen-containing groups is the most uniform, and the ΔP decreases linearly with the increase in the moisture content.

show abstract

“…Rockburst in roadways may cause not only serious economic loss and casualties but also extremely negative social impact (Gong et al, 2022;Wang et al, 2022;Liu et al, 2023). In addition, the frequent occurrence of rockburst disasters in roadways in the coal industry is incompatible with the theme for harmonious and stable development of the current society (Zou et al, 2022a;Huang et al, 2023b), which restricts the further development of the coal industry (Tan Y. L. et al, 2023;Zhao et al, 2023b;.…”

Section: Introductionmentioning

confidence: 99%

Energy evolution mechanism during rockburst development in structures of surrounding rocks of deep rockburst-prone roadways in coal mines

Xuan,

Cheng,

et al. 2023

Front. Energy Res.

View full text Add to dashboard Cite

Influenced by the deep high-stress environment, geological structures, and mining disturbance in coal mines, the frequency of rockburst disasters in roadways is increasing. This research analyzed energy evolution characteristics during rockburst development in the elastic bearing zone and energy conversion in the plastic failure zone. The critical energy criteria for structural instability of roadway surrounding rocks were deduced. Numerical software was also applied to simulate the energy evolution during rockburst development in surrounding rocks of rockburst-prone roadways under conditions of different mining depths and coal pillar widths. The occurrence mechanism of rockburst deep in coal mines was analyzed from the perspective of energy in structures of deep roadway surrounding rock in coal mines. The research results show that the critical energy criteria are closely related to the elastic strain energy stored in deep roadway surrounding rocks and the energy absorbed by support systems. The impact energy in roadways is directly proportional to the square of the stress concentration factor k. Moreover, as the mining depth increases, the location of the peak point of maximum energy density gradually shifts to coal ahead of the working face. The larger the mining depth is, the more significantly the energy density is influenced by advanced abutment pressure of the working face and the wider the affected area is. With the increment of the coal pillar width, the distance from the peak point of energy density to the roadway boundary enlarges abruptly at first and then slowly, and the critical coal pillar width for gentle change in the distance is 30 m. Changes in the peak elastic energy density in coal pillars with the coal pillar width can be divided into four stages: the slow increase stage, abrupt increase stage, abrupt decrease stage, and slow decrease stage. The elastic energy density is distributed asymmetrically in deep roadway surrounding rocks in coal mines. Under the action of structures of roadway surrounding rocks, energy evolution in these structures differs greatly during rockburst development under conditions of different coal pillar widths. This research provides an important theoretical basis for the support of rockburst-prone roadways during deep coal mining.

show abstract

Study of Time-Varying Laws of Stability and Wettability of SiO₂–H₂O Nanofluids with Different Particle Sizes

Cited by 16 publications

References 60 publications

Real-Time Multiscale Imaging of Heterogeneous Multistage Reactions: Insights into Nanoscale TiO₂ Synthesis

Real-Time Multiscale Imaging of Heterogeneous Multistage Reactions: Insights into Nanoscale TiO₂ Synthesis

Investigation on the Gas Emission Law of Water-Containing Coal across the Rank Range

Energy evolution mechanism during rockburst development in structures of surrounding rocks of deep rockburst-prone roadways in coal mines

Contact Info

Product

Resources

About

Study of Time-Varying Laws of Stability and Wettability of SiO2–H2O Nanofluids with Different Particle Sizes

Cited by 16 publications

References 60 publications

Real-Time Multiscale Imaging of Heterogeneous Multistage Reactions: Insights into Nanoscale TiO2 Synthesis

Real-Time Multiscale Imaging of Heterogeneous Multistage Reactions: Insights into Nanoscale TiO2 Synthesis

Investigation on the Gas Emission Law of Water-Containing Coal across the Rank Range

Energy evolution mechanism during rockburst development in structures of surrounding rocks of deep rockburst-prone roadways in coal mines

Contact Info

Product

Resources

About

Study of Time-Varying Laws of Stability and Wettability of SiO₂–H₂O Nanofluids with Different Particle Sizes

Real-Time Multiscale Imaging of Heterogeneous Multistage Reactions: Insights into Nanoscale TiO₂ Synthesis

Real-Time Multiscale Imaging of Heterogeneous Multistage Reactions: Insights into Nanoscale TiO₂ Synthesis