{"title":"Preparation and optical properties of one-dimensional magnetically oriented halloysite@Fe3O4 nanomaterials","authors":"Yinfeng Yu , Xiaotong Bu , Jing Qi , Zepeng Zhang , Junming Geng","doi":"10.1016/j.clay.2024.107479","DOIUrl":null,"url":null,"abstract":"<div><p>Clay minerals with composite magnetic particles offer potential as magnetically oriented nanomaterials for application in inorganic liquid crystals. However, the instability of magnetically oriented clay@Fe<sub>3</sub>O<sub>4</sub> materials, caused by the easy detachment of Fe<sub>3</sub>O<sub>4</sub> particles from the clay minerals surfaces and the corrosivity of the HCl dispersant on Fe<sub>3</sub>O<sub>4</sub> particles, has limited their development. In this work, hollow tubular halloysite (Hal) was used as the carrier for Fe<sub>3</sub>O<sub>4</sub> particles to obtain halloysite@Fe<sub>3</sub>O<sub>4</sub> (Hal@Fe<sub>3</sub>O<sub>4</sub>), in which Fe<sub>3</sub>O<sub>4</sub> particles were uniformly coated on the outer surface of Hal and located in the Hal tubular lumen. In addition, LiCl was employed as a dispersant instead of HCl in Hal@Fe<sub>3</sub>O<sub>4</sub> dispersions. They collaboratively enhanced the stability of magnetically oriented Hal@Fe<sub>3</sub>O<sub>4</sub> nanomaterials compared to magnetically oriented palygorskite@Fe<sub>3</sub>O<sub>4</sub> nanomaterials. The stable one-dimensional magnetically oriented Hal@Fe<sub>3</sub>O<sub>4</sub> nanomaterials demonstrated liquid crystal properties that were adjustable by a magnetic field, and photonic crystal properties. As a result, these functional materials could be used in many fields, such as inorganic liquid crystals, photonic crystals, and photonic switches.</p></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":null,"pages":null},"PeriodicalIF":5.3000,"publicationDate":"2024-07-02","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/S0169131724002278","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
Clay minerals with composite magnetic particles offer potential as magnetically oriented nanomaterials for application in inorganic liquid crystals. However, the instability of magnetically oriented clay@Fe3O4 materials, caused by the easy detachment of Fe3O4 particles from the clay minerals surfaces and the corrosivity of the HCl dispersant on Fe3O4 particles, has limited their development. In this work, hollow tubular halloysite (Hal) was used as the carrier for Fe3O4 particles to obtain halloysite@Fe3O4 (Hal@Fe3O4), in which Fe3O4 particles were uniformly coated on the outer surface of Hal and located in the Hal tubular lumen. In addition, LiCl was employed as a dispersant instead of HCl in Hal@Fe3O4 dispersions. They collaboratively enhanced the stability of magnetically oriented Hal@Fe3O4 nanomaterials compared to magnetically oriented palygorskite@Fe3O4 nanomaterials. The stable one-dimensional magnetically oriented Hal@Fe3O4 nanomaterials demonstrated liquid crystal properties that were adjustable by a magnetic field, and photonic crystal properties. As a result, these functional materials could be used in many fields, such as inorganic liquid crystals, photonic crystals, and photonic switches.
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...