Coordination environment of Si in calcium silicate hydrates, silicate minerals, and blast furnace slags: A XANES database

Li, Jiaqi; Zhang, Wenxin; Garbev, Krassimir; Monteiro, Paulo J.M.

doi:10.1016/j.cemconres.2021.106376

Cited by 32 publications

(5 citation statements)

References 73 publications

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“…Si-K XANES analysis indicated that the present samples and reference ¡-quartz showed similar white-line positions, implying that their Si 4+ coordination was four. 28) As in the case of Al 3+ , the fine structures above the white line represent a local environment of Si 4+ . Therefore, the Si 4+ ions in the samples exhibited similar local environments.…”

Section: Resultsmentioning

confidence: 97%

Large-scale production of nano-sized LTA-type zeolite particles by beads-milling and recrystallization method

Yamamoto,

Murata,

Wakihara

et al. 2023

J. Ceram. Soc. Japan

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Large-scale production of nano-sized LTA-type zeolite particles by beads-milling and recrystallization method were demonstrated. The particles were finely milled, and their crystallinity decreased with increasing milling time. The beads-milled particles retained a zeolitic local structure of Al and Si but cause partial amorphization and loss of gas adsorption ability. Recrystallization recovered the long-range order of the zeolite crystal structure and gas adsorption ability. Smaller beads lead to finer particles and inhibit amorphization of the zeolite.

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Section: Resultsmentioning

confidence: 97%

Large-scale production of nano-sized LTA-type zeolite particles by beads-milling and recrystallization method

Yamamoto,

Murata,

Wakihara

et al. 2023

J. Ceram. Soc. Japan

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“…There are also less intense peaks at approximately 1865.0 eV, which can be seen in the case of every sample other than quartz. The presence of these bumps can be interpreted as multiple scattering imposed on Si electronic structure and possible splitting of 3d orbitals [ 47 , 48 ]. In the case of NSP samples, the spectra do not differ much from one to another, and, other than the 1846.9 eV and 1865.0 eV regions, we did not observe any other peaks, so we can conclude that samples are uniform and amorphous.…”

Section: Resultsmentioning

confidence: 99%

Synthetic Opals or Versatile Nanotools—A One-Step Synthesis of Uniform Spherical Silica Particles

Laskowska,

Karczmarska,

Schabikowski

et al. 2023

IJMS

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Synthetic opals, a composition of homogeneous silica spheres in the mesoscale size range, have attracted the attention of scientists due to their favorable chemical and physical properties. Their chemical inertness and stability, biocompatibility, homogeneity, elevated specific surface area, and ease of functionalization of their surfaces make them a versatile nanotool. In the present study, the Stöber process was used to investigate the effect of parameters, such as reagent concentration and synthesis temperature, on the resulting silica particle size and structure. The optimal conditions for successfully obtaining homogeneous particles in the mesoscale range with high reproducibility were investigated. Several synthesis procedures and their dependence on the reaction temperature were presented to allow the selection of the assumed diameter of silica spheres. The numerous samples obtained were examined for size, homogeneity, structure, and specific surface area. On the basis of specific surface area measurements and nuclear magnetic resonance studies, the internal hierarchical structure of the spherical silica was confirmed as consisting of a solid core and layers of secondary spheres covered by a solid shell. Structural studies (X-ray Spectroscopy, X-ray Absorption Near-Edge Structure, and nuclear magnetic resonance), together with infrared vibrational spectroscopy, showed no dependence of the structure of the obtained mesospheres on the concentration of reagents and the size of the obtained particles.

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“…This innovative material boasts superior mechanical properties, enhanced durability, and excellent corrosion and heat resistance while significantly reducing carbon emissions [ 9 ]. Furthermore, geopolymer concrete presents an opportunity to convert diverse wastes into valuable construction materials, thereby diminishing greenhouse gas emissions associated with cement production [ 10 ]. Nonetheless, geopolymer concrete tends to be more brittle than its OPC counterpart, breaking more readily under tensile stress at equivalent strength levels [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Stress–Strain Relationship of PVA-Fiber-Reinforced Engineered Geopolymer Composite

Zhou,

Li,

Liu

et al. 2024

Polymers

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In this study, seven Engineering Geopolymer Composite (EGC) groups with varying proportions were prepared. Rheological, compressive, flexural, and axial tensile tests of the EGC were conducted to study the effects of the water/binder ratio, the cement/sand ratio, and fiber type on its properties. Additionally, a uniaxial tension constitutive model was established. The results indicate that the EGC exhibits early strength characteristics, with the 7-day compressive strength reaching 80% to 92% of the 28-day compressive strength. The EGC demonstrates high compressive strength and tensile ductility, achieving up to 70 MPa and 4%, respectively. The mechanical properties of the EGC improved with an increase in the sand/binder ratio and decreased with an increase in the water/binder ratio. The stress–strain curve of the EGC resembles that of the ECC, displaying a strain-hardening state that can be divided into two stages: before cracking, the matrix primarily bears the stress; after cracking, the slope decreases, and the fiber predominantly bears the stress.

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Coordination environment of Si in calcium silicate hydrates, silicate minerals, and blast furnace slags: A XANES database

Cited by 32 publications

References 73 publications

Large-scale production of nano-sized LTA-type zeolite particles by beads-milling and recrystallization method

Large-scale production of nano-sized LTA-type zeolite particles by beads-milling and recrystallization method

Synthetic Opals or Versatile Nanotools—A One-Step Synthesis of Uniform Spherical Silica Particles

Mechanical Properties and Stress–Strain Relationship of PVA-Fiber-Reinforced Engineered Geopolymer Composite

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