Citation: | LIU Mingxian. Structure Tailoring of Halloysite Nanotubes and Their Application in New Materials Area[J]. Conservation and Utilization of Mineral Resources, 2022, 42(4): 11-21. doi: 10.13779/j.cnki.issn1001-0076.2022.04.002 |
The "carbon peaking and carbon neutrality goals" of China has raised more requirements for protection and utilization of non-metallic minerals. Halloysite is one type of kaolin clay with 1 GA6FA 1 aluminosilicate layered structure. Halloysite nanotubes (HNTs) show unique empty lumen morphology, which have advantages such as high aspect ratio, large surface area, high porosity, good adsorption ability, low toxicity, and numerous application fields. In this paper, the physicochemical and morphological properties of HNTs were introduced. The related mineral processing, purification method, structural tailoring, chemical modification, assembly behavior of HNTs were involved. Then, the applications of HNTs in high-performance composites, environmental protection, biomedicine, new energy materials and catalyst were systematically reviewed. Finally, the problems of the research and development of HNTs were pointed out, and the development direction of the tubular clay mineral materials was prospected.
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Crystal structure of halloysite
Appearance of halloysite clay mineral(a); TEM images of mixed morphology of tube and flake in the mineral(b); XRD pattern of purified halloysite(c); TEM image of halloysite(d)
Morphology of halloysite before and after thermal treatment: (a) SEM image of halloysite; (b) TEM image of halloysite; (c) TEM of halloysite after treatment at 600 ℃; (d) TEM of halloysite after treatment at 900 ℃
Grafting modification of halloysite nanotube by ATRP method
TEM images of Au nanoparticles in the lumen of halloysite
Alignment of halloysite in epoxy resin by spray-coating method
Preparation process of D-HNTs/PLLA composite fiber by electrospinning
Synthsis process of NiS2@Ni-Mn-O/HNTs and TEM images of the halloysite before and after modification