Back to Search
Start Over
Study on the influence mechanism of Mg2+ modification on vermiculite thermal expansion based on molecular dynamics simulation
- Source :
- Ceramics International. 46:6413-6417
- Publication Year :
- 2020
- Publisher :
- Elsevier BV, 2020.
-
Abstract
- The thermal insulating performance of expanded vermiculite is closely related to expansibility. A novel method of Mg2+ modification was proposed to improve the vermiculite expansion ratio. The modification process was characterised by energy dispersive X-Ray spectroscopy, X-ray diffraction, Fourier-transform infrared spectroscopy, thermogravimetric-differential scanning calorimeter and scanning electron microscopy. Moreover, the thermal expansion experiment was performed to investigate the expansion behaviours of Raw-V and Mg–V samples at various temperatures. The result indicated that the introduction of Mg2+ could increase the vermiculite interlayer water content through hydration interaction, and the expansion ratio increased 13.7% under the heating temperature of 900 °C after modification. To explain the interaction of magnesium ion and water molecules, a molecular dynamics model was developed, and the simulation results were validated using the binding energy calculation. The results of this study can provide a new perspective and theoretical guidance for the commercial process of vermiculite expansion.
- Subjects :
- 010302 applied physics
Materials science
Scanning electron microscope
Process Chemistry and Technology
Binding energy
Infrared spectroscopy
02 engineering and technology
Vermiculite
021001 nanoscience & nanotechnology
01 natural sciences
Thermal expansion
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
Expansion ratio
Chemical engineering
0103 physical sciences
Materials Chemistry
Ceramics and Composites
0210 nano-technology
Spectroscopy
Magnesium ion
Subjects
Details
- ISSN :
- 02728842
- Volume :
- 46
- Database :
- OpenAIRE
- Journal :
- Ceramics International
- Accession number :
- edsair.doi...........f73b9bf59195a736b9f9e91697016490