Instant formation of AlN whiskers and monocrystalline silicon with the separation of silicon and aluminum elements from 7 Å halloysite during thermite reduction
Source abstract
Abstract
Natural halloysite have attracted great attention owing to their unique hollow tube and strong adsorption capacity. Nevertheless, the straightforward utilization of halloysite without further processing cannot fully discover its potential will lead to the waste of resources. In this study, an environmentally friendly method for the simultaneous separation of silica and aluminum from natural 7 Å halloysite via the aluminum thermal reduction method upon 700 °C under the system of aluminum powder and NaCl in N 2 atmosphere was developed, concurrently occurs with the structural transformation from the raw hollow tubular halloysite to AIN whiskers and monocrystalline silicon droplet tips was observed. The formation of AlN whiskers can be concluded as three steps: (1) the reduction of Si 4+ in Si O tetrahedron into Si 0 atoms; (2) the separation of silicon and aluminum in the 1:1 meta-halloysite layer and the Si 0 atoms transportation to the end of whisker rod to form the monocrystalline silicon microsphere; (3) the formation of AlN whiskers by the replacement of the remaining oxygen atoms in the aluminum‑oxygen octahedra. This in-situ replacement of oxygen atoms by nitrogen atoms in the Al O octahedron of tubular meta-halloysite plays a pivotal role in decreasing the reaction temperature. This work provides a novel idea and opens up a new technical route to prepare aluminum nitride and monocrystalline silicon with green efficiency and low cost.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Clay minerals and soil interactions · Bauxite Residue and Utilization · Advanced ceramic materials synthesis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (51)
Show source-provided references
1. Formation of Ti2AlNx MAX phase by “Hydride Cycle” and SHS methods10.1016/j.ceramint.2022.11.350 ↗
2. Nanomaterials: a review about halloysite nanotubes, properties, and application in the biological field10.3390/ijms231911518 ↗
3. Formation mechanism and photoluminescence of AlN nanowhiskers10.1088/0022-3727/41/2/025101 ↗
4. Clay minerals derived nanostructured silicon with various morphology: controlled synthesis, structural evolution, and enhanced lithium storage properties10.1016/j.jpowsour.2018.10.031 ↗
5. High temperature properties of AlN coatings deposited by chemical vapor deposition for solar central receivers10.1016/j.surfcoat.2019.07.083 ↗
6. Mechanochemical reduction of clay minerals to porous silicon nanoflakes for high-performance lithium-ion battery anodes10.1039/D3CC04403C ↗
7. Development and applications of aluminum nitride thin film technology
8. Growth and characterization of AlN and AlGaN epitaxial films on AlN single crystal substrates10.1149/1.3560527 ↗
9. Dehydroxylation of kaolinite and halloysite-rich samples: an in situ study of the texture and structural evolutions10.3390/min13111418 ↗
10. X-ray photoelectron spectroscopic study on sapphire nitridation for GaN growth by hydride vapor phase epitaxy: nitridation mechanism10.1063/1.1618357 ↗
11. A ferroptosis-targeting ceria anchored halloysite as orally drug delivery system for radiation colitis therapy10.1038/s41467-023-40794-w ↗
12. Microstructure and properties of halloysite nanotubes and modification methods: a comprehensive review10.1016/j.clay.2024.107348 ↗
13. Formation of Si hollow structures as promising anode materials through reduction of silica in AlCl3–NaCl molten salt10.1021/acsnano.8b06528 ↗
14. Nitric oxide releasing halloysite nanotubes for biomedical applications10.1016/j.jcis.2021.01.047 ↗
15. Silicon carbide doping by ion implantation
16. A micro-electromechanical systems based vibration energy harvester with aluminum nitride piezoelectric thin film deposited by pulsed direct-current magnetron sputtering10.1016/j.apenergy.2018.07.001 ↗
17. Preparation of aluminum nitride powder
18. Nano-scale AlN powders and AlN/Al composites by full and partial direct nitridation of aluminum in solid-state10.1016/j.jallcom.2014.12.220 ↗
19. Kohn · 1956
20. Revisiting the preparation progress of nano-structured Si anodes toward industrial application from the perspective of cost and scalability10.1002/aenm.202102181 ↗
21. Enhanced thermal conductivity of epoxy composites with ternary particle size through the use of hybrid polyhedral α-alumina oxide and aluminum nitride10.1016/j.ceramint.2022.08.127 ↗
22. Construction of efficient silicon solar cells through polymetallic oxidation-reduction triggered by thermite reaction10.1016/j.nanoen.2023.108801 ↗
23. A low temperature molten salt process for aluminothermic reduction of silicon oxides to crystalline Si for Li-ion batteries10.1039/C5EE02487K ↗
24. Synthesis mechanism of AlN–SiC solid solution reinforced Al2O3 composite by two-step nitriding of Al–Si3N4–Al2O3 compact at 1500° C10.1016/j.ceramint.2023.04.027 ↗
25. Past, present and future perspectives on halloysite clay minerals10.3390/molecules25204863 ↗
26. XPS analysis of AlN thin films deposited by plasma enhanced atomic layer deposition10.1016/j.apsusc.2014.07.105 ↗
27. Synthesis and characterization of Si/SiO/SiC composites through carbothermic reduction of rice husk-based silica10.1007/s12633-022-02278-2 ↗
28. Fabrication of AlN particles and whiskers via salt-assisted combustion synthesis10.1016/j.ceramint.2014.11.135 ↗
29. High morphological stability and structural transition of halloysite (Hunan, China) in heat treatment10.1016/j.clay.2014.08.010 ↗
30. Radical guided selective loading of silver nanoparticles at interior lumen and out surface of halloysite nanotubes10.1016/j.matdes.2016.07.127 ↗
31. Mineralogy and physico-chemical data of two newly discovered halloysite in China and their contrasts with some typical minerals10.3390/min8030108 ↗
32. Sintering behavior of aluminum nitride powder prepared by self-propagating high-temperature synthesis method10.1007/s12598-015-0582-6 ↗
33. Morphologically tunable nanoarchitectonics of mixed kaolin-halloysite derived nitrogen-doped activated nanoporous carbons for supercapacitor and CO2 capture applications10.1016/j.carbon.2022.02.047 ↗
34. Soft, robust, Li-ion friendly halloysite-based hybrid protective layer for dendrite-free Li metal anode10.1016/j.cej.2021.130326 ↗
35. A self-healing nanocomposite hydrogel electrolyte for rechargeable aqueous Zn-MnO battery10.1016/j.colsurfa.2022.129195 ↗
36. Interconnected silicon nanoparticles originated from halloysite nanotubes through the magnesiothermic reduction: a high-performance anode material for lithium-ion batteries10.1016/j.clay.2018.07.004 ↗
37. Purification, synthesis and structural, optical characterizations of silicon (Si) nano-particles from bentonite mineral: the effect of magnesium-thermic chemical reduction10.1007/s12633-020-00533-y ↗
38. Enhanced thermal conductivity and thermal performance of form-stable composite phase change materials by using β-Aluminum nitride10.1016/j.apenergy.2008.10.020 ↗
39. Reconstructed nano-si assembled microsphere via molten salt-assisted low-temperature aluminothermic reduction of diatomite as high-performance anodes for lithium-ion batteries10.1021/acsaem.1c00938 ↗
40. Xing · 2021
41. A high-strength and ultra-stable halloysite nanotubes-crosslinked polyacrylamide hydrogel electrolyte for flexible zinc-ion batteries10.1016/j.jpowsour.2021.230196 ↗
42. Kaolinite nanoscroll significantly inhibiting polysulfide ions shuttle in lithium sulfur batteries10.1016/j.clay.2022.106516 ↗
43. Electrospun microfiber membranes embedded with drug-loaded clay nanotubes for sustained antimicrobial protection10.1021/nn506255e ↗
44. Preparation and performance of alumina ceramic coating doped with aluminum nitride by micro arc oxidation10.1016/j.ceramint.2020.03.179 ↗
45. Preparation and structure analysis of aluminum oxide/water glass/polyurethane composite grouting material for mining
46. Solution-catalyzed carbothermal reduction of argo-waste SiO2 enables low-temperature and fast synthesis of Si (II)-C anode
47. Applications and interfaces of halloysite nanocomposites10.1016/j.clay.2015.06.034 ↗
48. Manipulating the conversion kinetics of polysulfides by engineering oxygen p-band of halloysite for improved Li-S batteries10.1002/smll.202105661 ↗
49. Gold@Halloysite nanotubes-chitin composite hydrogel with antibacterial and hemostatic activity for wound healing
50. From sand to fast and stable silicon anode: synthesis of hollow Si@ void@ C yolk–shell microspheres by aluminothermic reduction for lithium storage10.1016/j.cclet.2018.08.018 ↗
51. Preparation of AlN under vacuum by the alumina carbothermal reduction nitridation method10.1016/j.ceramint.2019.10.011 ↗