Preparation and Structural Characterization of Novel Nanohybrids by Cationic 3D Silica Nanoparticles Sandwiched between 2D Anionic Montmorillonite Clay through Electrostatic Attraction
| Autor: | Jeng-Yue Wu, Tzu-Fan Tseng |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
Materials science
Silylation Scanning electron microscope Colloidal silica Cationic polymerization respiratory system Grafting Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry.chemical_compound General Energy Montmorillonite chemistry Chemical engineering Transmission electron microscopy Polymer chemistry Physical and Theoretical Chemistry Fourier transform infrared spectroscopy |
| Zdroj: | The Journal of Physical Chemistry C. 113:13036-13044 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/jp9007043 |
| Popis: | In our study, cationic colloidal silica was prepared using a silylation process to modify silica by chemically grafting it with (γ-aminopropyl)trimethoxysilane (APS) under acidic conditions. The silylation of silica by APS grafting was characterized by FTIR and solid 29Si NMR with its ζ potential measured for the confirmation of cationic nature for APS-modified silica (APS-silica). The strong electrostatic attraction of cationic APS-silica toward negatively charged Na+-montmorillonite (MMT) clay resulted in the formation of APS-silica/MMT nanohybrids during the mixing process. The coagulated nanohybrids acquired different charges depending on the weight ratios (WRs) of APS-silica to MMT in the nanohybrids. The surface potential of nanohybrids also varies with the amount of APS-silica imparted when measured using a ζ potential analyzer. Images obtained by transmission electron microscopy and field-emission scanning electron microscopy reveal the supracolloidal structure of the nanohybrids. APS-silica nanop... |
| Databáze: | OpenAIRE |
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