A three-dimensional image reflecting the dispersion state of ceramic platelets in solvent: Observation of montmorillonite dispersed in silica gel by synchrotron X-ray multiscale tomography

IF 5.3 2区地球科学 Q2 CHEMISTRY, PHYSICAL Applied Clay Science Pub Date : 2023-09-15 DOI:10.1016/j.clay.2023.107025

Shingo Machida , Gaku Okuma , Yutaro Arai , Akihisa Takeuchi , Masayuki Uesugi , Ken-ichi Katsumata , Atsuo Yasumori

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Abstract

Visualizing montmorillonite (MMT) platy particles dispersed in silica gel was firstly demonstrated by synchrotron X-ray multiscale tomography. The silica sol-gel reaction proceeded with the preservation of MMT dispersibility in water, MeOH, and DMF mixture. The 3D image reconstructed using high-resolution X-ray computed (CT) images (i.e., nano-CT) displayed platy particles in the range of 0.5—2.5 μm, which matched that observed in the field-emission microscope image of powder MMT. In addition, some platy particles are assembled by contacting their edge and layered surfaces, suggesting the presence of a house-of-cards structure. Given a decrease in the distance by 30% between platy particles roughly estimated using a decrease in volume by 65% before and after silica gelation, a dispersion state formed by micrometer-sized platy particles did not essentially differ after silica gelation. Therefore, these results indicated that the 3D image of MMT platy particles in silica gel reflected the dispersion state of MMT particles in the solvent.

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反映陶瓷片在溶剂中分散状态的三维图像——同步辐射X射线多尺度层析成像观察蒙脱石在硅胶中的分散

利用同步加速器x射线多尺度断层成像技术首次实现了蒙脱土(MMT)片状颗粒在硅胶中的分散。硅胶溶胶-凝胶反应继续进行，并保持了MMT在水、甲醇和DMF混合物中的分散性。利用高分辨率x射线计算机(CT)图像(即纳米CT)重建的三维图像显示了0.5 ~ 2.5 μm范围内的片状颗粒，与粉末MMT场发射显微镜图像相匹配。此外，一些板状颗粒通过接触它们的边缘和分层表面来组装，这表明存在卡片屋结构。假设在硅胶凝胶化前后，用体积减少65%粗略估算出板状颗粒之间的距离减少了30%，那么在硅胶凝胶化前后，微米级板状颗粒形成的分散状态并没有本质上的不同。因此，这些结果表明，硅胶中MMT板状颗粒的三维图像反映了MMT颗粒在溶剂中的分散状态。

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来源期刊

Applied Clay Science 地学-矿物学

CiteScore

10.30

自引率

10.70%

发文量

289

审稿时长

39 days

期刊介绍： Applied Clay Science aims to be an international journal attracting high quality scientific papers on clays and clay minerals, including research papers, reviews, and technical notes. The journal covers typical subjects of Fundamental and Applied Clay Science such as: • Synthesis and purification • Structural, crystallographic and mineralogical properties of clays and clay minerals • Thermal properties of clays and clay minerals • Physico-chemical properties including i) surface and interface properties; ii) thermodynamic properties; iii) mechanical properties • Interaction with water, with polar and apolar molecules • Colloidal properties and rheology • Adsorption, Intercalation, Ionic exchange • Genesis and deposits of clay minerals • Geology and geochemistry of clays • Modification of clays and clay minerals properties by thermal and physical treatments • Modification by chemical treatments with organic and inorganic molecules(organoclays, pillared clays) • Modification by biological microorganisms. etc...