Terahertz time domain detection of imidazolium ionic liquid reactivity in nanohybrid materials based on Kaolinite and Halloysite
| Autor: | Mária Čaplovičová, Annett Steudel, Marián Janek, Tomáš Zacher, Mira Naftaly, Katja Emmerich, Viktor Hronský, Mária Mečiarová |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Electromagnetics
Materials science Inorganic chemistry Intercalation (chemistry) Geology 02 engineering and technology engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Halloysite 0104 chemical sciences chemistry.chemical_compound Chemical engineering chemistry Geochemistry and Petrology Ionic liquid engineering Kaolinite Fourier transform infrared spectroscopy 0210 nano-technology Spectroscopy Powder diffraction |
| Zdroj: | Applied Clay Science. 135:475-484 |
| ISSN: | 0169-1317 |
| DOI: | 10.1016/j.clay.2016.10.036 |
| Popis: | A new nanohybrid material based on kaolinite intercalate with imidazolium ionic liquid (IL) was compared in its physical-chemical behavior with an analogue specimen prepared from halloysite. The intercalation of well-ordered kaolinite and poorly ordered halloysite, was successfully observed by terahertz time-domain spectroscopy (THz-TDS) in the far infra-red region. The prepared specimen showed unique spectral response: e.g. four broadened bands were observed for kaolinite-IL intercalate, whereas only one broadened band was observed for halloysite-IL intercalate. These spectra make it possible to observe intercalation and guest reactivity in this type of materials using THz (far infra-red) spectroscopy. The intercalation reactions were confirmed by independent techniques such as X-ray powder diffraction, Fourier transform infrared spectroscopy, simultaneous thermal analysis with mass spectrometry, and high-resolution solid-state NMR spectroscopy. TEM showed that kaolinite nanolayers upon repeated intercalation with IL preserved their platy morphology. This was in contrast to X-ray powder diffraction data showing transformation of kaolinite to halloysite-like material. Such delaminated kaolinite preserving its platy morphology has a good potential for application in nanocomposite materials with barrier properties. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect