Yu-Cheng Li , Yong-Gui Chen , Li Liu , Guo-Ping Zhang , Wei-Min Ye , Qiong Wang
{"title":"通过纳米压痕取向薄膜提取蒙脱石准晶体的水力学特性","authors":"Yu-Cheng Li , Yong-Gui Chen , Li Liu , Guo-Ping Zhang , Wei-Min Ye , Qiong Wang","doi":"10.1016/j.clay.2024.107595","DOIUrl":null,"url":null,"abstract":"<div><div>This paper presents the first effort to extract the hydromechanical properties of montmorillonite quasi-crystals via nanoindentation testing of highly oriented montmorillonite thin films with varying degrees of water intercalation. By preparing highly preferentially oriented montmorillonite thin films, the evolution of basal spacing, isothermal adsorption of water, microstructure, and mechanical properties of montmorillonite quasi-crystals equilibrated with different relative humidity (RH) was examined by the grazing incidence X-ray diffraction (GIXRD), sorptometry, environmental scanning electron microscopy (ESEM), and nanoindentation, respectively. Results indicate that the montmorillonite thin films exhibit depth-dependent mechanical properties across different RH. At a 40 % RH, the Young's modulus and hardness of a montmorillonite quasi-crystal consisting of ∼60 platelets are 4.85 and 0.20 GPa, which remain relatively stable upon increasing the RH to 50 % but experienced a remarkable decrease to 3.31 and 0.12 GPa when the RH reaches 65 %. Simultaneous GIXRD and isothermal adsorption results reveal the interlayer swelling as the key factor contributing to the mechanical property variation of montmorillonite quasi-crystal, while the capillarity dominates the mechanical behavior at high RH. This study shed light on the hydromechanical behavior of montmorillonite upon hydration and swelling, and paves a solid foundation for the multiscale modeling of unsaturated compacted bentonites.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"261 ","pages":"Article 107595"},"PeriodicalIF":5.3000,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Extracting hydromechanical properties of montmorillonite quasi-crystals via nanoindentation of oriented thin films\",\"authors\":\"Yu-Cheng Li , Yong-Gui Chen , Li Liu , Guo-Ping Zhang , Wei-Min Ye , Qiong Wang\",\"doi\":\"10.1016/j.clay.2024.107595\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>This paper presents the first effort to extract the hydromechanical properties of montmorillonite quasi-crystals via nanoindentation testing of highly oriented montmorillonite thin films with varying degrees of water intercalation. By preparing highly preferentially oriented montmorillonite thin films, the evolution of basal spacing, isothermal adsorption of water, microstructure, and mechanical properties of montmorillonite quasi-crystals equilibrated with different relative humidity (RH) was examined by the grazing incidence X-ray diffraction (GIXRD), sorptometry, environmental scanning electron microscopy (ESEM), and nanoindentation, respectively. Results indicate that the montmorillonite thin films exhibit depth-dependent mechanical properties across different RH. At a 40 % RH, the Young's modulus and hardness of a montmorillonite quasi-crystal consisting of ∼60 platelets are 4.85 and 0.20 GPa, which remain relatively stable upon increasing the RH to 50 % but experienced a remarkable decrease to 3.31 and 0.12 GPa when the RH reaches 65 %. Simultaneous GIXRD and isothermal adsorption results reveal the interlayer swelling as the key factor contributing to the mechanical property variation of montmorillonite quasi-crystal, while the capillarity dominates the mechanical behavior at high RH. This study shed light on the hydromechanical behavior of montmorillonite upon hydration and swelling, and paves a solid foundation for the multiscale modeling of unsaturated compacted bentonites.</div></div>\",\"PeriodicalId\":245,\"journal\":{\"name\":\"Applied Clay Science\",\"volume\":\"261 \",\"pages\":\"Article 107595\"},\"PeriodicalIF\":5.3000,\"publicationDate\":\"2024-10-16\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Applied Clay Science\",\"FirstCategoryId\":\"89\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0169131724003430\",\"RegionNum\":2,\"RegionCategory\":\"地球科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"CHEMISTRY, PHYSICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Applied Clay Science","FirstCategoryId":"89","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0169131724003430","RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
Extracting hydromechanical properties of montmorillonite quasi-crystals via nanoindentation of oriented thin films
This paper presents the first effort to extract the hydromechanical properties of montmorillonite quasi-crystals via nanoindentation testing of highly oriented montmorillonite thin films with varying degrees of water intercalation. By preparing highly preferentially oriented montmorillonite thin films, the evolution of basal spacing, isothermal adsorption of water, microstructure, and mechanical properties of montmorillonite quasi-crystals equilibrated with different relative humidity (RH) was examined by the grazing incidence X-ray diffraction (GIXRD), sorptometry, environmental scanning electron microscopy (ESEM), and nanoindentation, respectively. Results indicate that the montmorillonite thin films exhibit depth-dependent mechanical properties across different RH. At a 40 % RH, the Young's modulus and hardness of a montmorillonite quasi-crystal consisting of ∼60 platelets are 4.85 and 0.20 GPa, which remain relatively stable upon increasing the RH to 50 % but experienced a remarkable decrease to 3.31 and 0.12 GPa when the RH reaches 65 %. Simultaneous GIXRD and isothermal adsorption results reveal the interlayer swelling as the key factor contributing to the mechanical property variation of montmorillonite quasi-crystal, while the capillarity dominates the mechanical behavior at high RH. This study shed light on the hydromechanical behavior of montmorillonite upon hydration and swelling, and paves a solid foundation for the multiscale modeling of unsaturated compacted bentonites.
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...