Preparation and characterization of coverage-controlled CaCO3 nanoparticles
| Autor: | Zhong-fu Zhao, Yiu-Ting R. Lau, Chi Ming Chan, Yong Lin, Yang Li |
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| Rok vydání: | 2010 |
| Předmět: |
chemistry.chemical_classification
Thermogravimetric analysis Materials science Analytical chemistry Nanoparticle Surfaces Coatings and Films Electronic Optical and Magnetic Materials Biomaterials chemistry.chemical_compound Colloid and Surface Chemistry chemistry Chemical engineering X-ray photoelectron spectroscopy Stearate Monolayer Surface modification Fourier transform infrared spectroscopy Alkyl |
| Zdroj: | Journal of Colloid and Interface Science. 345:168-173 |
| ISSN: | 0021-9797 |
| DOI: | 10.1016/j.jcis.2010.01.080 |
| Popis: | CaCO 3 nanoparticles were coated with stearate through a salt-exchange procedure. Their coverage had been successfully controlled by extraction in a Soxhlet apparatus, based on which a series of CaCO 3 nanoparticles were obtained with different surface coverages. They were characterized with thermogravimetric analysis, X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy. It was found that free stearate, intercalated stearate and chemically-bonded alkyl chains could be extracted sequentially with the Soxhlet apparatus. Thus, the coverages of CaCO 3 nanoparticles could be adjusted through carefully extracting the stearates from the CaCO 3 nanoparticles with multi-layer coverage. Spectroscopic results revealed that the alkyl chains tended to adopt an extended-chain conformation in the monolayer coverage as well as the bi-layer coverage, but less ordered conformation in partially-coated coverage and random orientation at the outmost surface of the coated nanoparticles. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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