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Silica‐assisted cold sintering of diopside for sustainable cementitious composites.

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Title: Silica‐assisted cold sintering of diopside for sustainable cementitious composites.
Authors: Huang, Wei1,2 (AUTHOR), Yang, Jingjing1,2 (AUTHOR), Li, Boya2 (AUTHOR), Tao, Mingjiang3 (AUTHOR), Zhang, Guoping4 (AUTHOR), Luo, Jian1,2 (AUTHOR) jluo@alum.mit.edu
Source: Journal of the American Ceramic Society. Jan2026, Vol. 109 Issue 1, p1-11. 11p.
Subjects: Diopside, Silica nanoparticles, Cement composites, Vickers hardness, Sustainable buildings, Sintering, X-ray diffraction, Crystallization kinetics
Abstract: This study explores cold sintering of naturally occurring minerals as supplementary cementitious materials (SCM) or cement analogs, which have the potential to transform the traditional high‐energy, high‐emission cement manufacturing pathways. Diopside (MgCaSi2O6), a natural inosilicate, is used as the model system. As diopside is hard for cold sintering directly (by itself), this study demonstrates that the addition of amorphous silica nanoparticles can enable cold sintering of diopside. The cold‐sintered diopside–silica composites are characterized by X‐ray diffraction, scanning electron microscopy, and transmission electron microscopy. The effect of the relative weight percentage of silica added is examined. The relative density of the cold‐sintered composite reaches nearly 90% at 400 MPa and 200°C in 60 min. For specimens with the addition of 30 wt% or more of amorphous SiO2, cold sintering also induces partial crystallization, converting a fraction of amorphous silica to quartz. The crystallization kinetics exhibits a stochastic nature. The Vickers hardness of the cold‐sintered diopside–silica composite increases with increasing amount of silica, whichpromotes cold sintering, reaching ∼3 GPa with 20 wt% or more silica. The diopside–silica composites studied here serve as a model system for metal‐leached silicate mine tailings, which are expected to have nanoporous amorphous silica shells on silicate particles to enable the silica‐assisted cold sintering mechanism discovered in this study. [ABSTRACT FROM AUTHOR]
Copyright of Journal of the American Ceramic Society is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 191210574
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Label: Title
  Group: Ti
  Data: Silica‐assisted cold sintering of diopside for sustainable cementitious composites.
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  Data: <searchLink fieldCode="AR" term="%22Huang%2C+Wei%22">Huang, Wei</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yang%2C+Jingjing%22">Yang, Jingjing</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Li%2C+Boya%22">Li, Boya</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Tao%2C+Mingjiang%22">Tao, Mingjiang</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhang%2C+Guoping%22">Zhang, Guoping</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Luo%2C+Jian%22">Luo, Jian</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> jluo@alum.mit.edu</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+the+American+Ceramic+Society%22">Journal of the American Ceramic Society</searchLink>. Jan2026, Vol. 109 Issue 1, p1-11. 11p.
– Name: Subject
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  Data: <searchLink fieldCode="DE" term="%22Diopside%22">Diopside</searchLink><br /><searchLink fieldCode="DE" term="%22Silica+nanoparticles%22">Silica nanoparticles</searchLink><br /><searchLink fieldCode="DE" term="%22Cement+composites%22">Cement composites</searchLink><br /><searchLink fieldCode="DE" term="%22Vickers+hardness%22">Vickers hardness</searchLink><br /><searchLink fieldCode="DE" term="%22Sustainable+buildings%22">Sustainable buildings</searchLink><br /><searchLink fieldCode="DE" term="%22Sintering%22">Sintering</searchLink><br /><searchLink fieldCode="DE" term="%22X-ray+diffraction%22">X-ray diffraction</searchLink><br /><searchLink fieldCode="DE" term="%22Crystallization+kinetics%22">Crystallization kinetics</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: This study explores cold sintering of naturally occurring minerals as supplementary cementitious materials (SCM) or cement analogs, which have the potential to transform the traditional high‐energy, high‐emission cement manufacturing pathways. Diopside (MgCaSi2O6), a natural inosilicate, is used as the model system. As diopside is hard for cold sintering directly (by itself), this study demonstrates that the addition of amorphous silica nanoparticles can enable cold sintering of diopside. The cold‐sintered diopside–silica composites are characterized by X‐ray diffraction, scanning electron microscopy, and transmission electron microscopy. The effect of the relative weight percentage of silica added is examined. The relative density of the cold‐sintered composite reaches nearly 90% at 400 MPa and 200°C in 60 min. For specimens with the addition of 30 wt% or more of amorphous SiO2, cold sintering also induces partial crystallization, converting a fraction of amorphous silica to quartz. The crystallization kinetics exhibits a stochastic nature. The Vickers hardness of the cold‐sintered diopside–silica composite increases with increasing amount of silica, whichpromotes cold sintering, reaching ∼3 GPa with 20 wt% or more silica. The diopside–silica composites studied here serve as a model system for metal‐leached silicate mine tailings, which are expected to have nanoporous amorphous silica shells on silicate particles to enable the silica‐assisted cold sintering mechanism discovered in this study. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of the American Ceramic Society is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1111/jace.70247
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 11
        StartPage: 1
    Subjects:
      – SubjectFull: Diopside
        Type: general
      – SubjectFull: Silica nanoparticles
        Type: general
      – SubjectFull: Cement composites
        Type: general
      – SubjectFull: Vickers hardness
        Type: general
      – SubjectFull: Sustainable buildings
        Type: general
      – SubjectFull: Sintering
        Type: general
      – SubjectFull: X-ray diffraction
        Type: general
      – SubjectFull: Crystallization kinetics
        Type: general
    Titles:
      – TitleFull: Silica‐assisted cold sintering of diopside for sustainable cementitious composites.
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          Name:
            NameFull: Huang, Wei
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            NameFull: Yang, Jingjing
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            NameFull: Li, Boya
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            NameFull: Tao, Mingjiang
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            NameFull: Zhang, Guoping
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            – D: 01
              M: 01
              Text: Jan2026
              Type: published
              Y: 2026
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              Value: 109
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            – TitleFull: Journal of the American Ceramic Society
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