{"title":"Diameter and chirality of natural and synthetic imogolite","authors":"","doi":"10.1016/j.clay.2024.107497","DOIUrl":null,"url":null,"abstract":"<div><p>Sixty years after their discovery, the structure of imogolite is still debated. We have carefully characterized natural and synthetic imogolites by Small-Angle X-ray Scattering, Infrared spectroscopy, Nuclear Magnetic Resonance, and cryo-TEM. We show that the natural imogolite has a significantly smaller diameter and is less polydisperse than the synthetic imogolite. Natural imogolite has an average diameter between the (11,0) and (12,0) configurations. However, surprisingly, the configuration closest to this average size and in better agreement with WAXS data is the (11,1) chiral structure. Concerning the synthetic nanotube, its average diameter is between the (13,0) and (14,0) configurations and measurements tend to show that it is most probably a combination of more than two chiralities. Finally, using a theoretical description of the strain energy as a function of the radius, we show that the observed polydispersity could be explained by the role of proto-imogolites in the formation process of imogolite.</p></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":null,"pages":null},"PeriodicalIF":5.3000,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S016913172400245X/pdfft?md5=af3a296213dcaef55f374df691efa959&pid=1-s2.0-S016913172400245X-main.pdf","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Applied Clay Science","FirstCategoryId":"89","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S016913172400245X","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}
引用次数: 0
Abstract
Sixty years after their discovery, the structure of imogolite is still debated. We have carefully characterized natural and synthetic imogolites by Small-Angle X-ray Scattering, Infrared spectroscopy, Nuclear Magnetic Resonance, and cryo-TEM. We show that the natural imogolite has a significantly smaller diameter and is less polydisperse than the synthetic imogolite. Natural imogolite has an average diameter between the (11,0) and (12,0) configurations. However, surprisingly, the configuration closest to this average size and in better agreement with WAXS data is the (11,1) chiral structure. Concerning the synthetic nanotube, its average diameter is between the (13,0) and (14,0) configurations and measurements tend to show that it is most probably a combination of more than two chiralities. Finally, using a theoretical description of the strain energy as a function of the radius, we show that the observed polydispersity could be explained by the role of proto-imogolites in the formation process of imogolite.
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...