Modification of the Thermally Exfoliated Vermiculite by Sonication and Grafting Methods
Journal Title: Journal of New technology and Materials - Year 2016, Vol 6, Issue 2
Abstract
In the present study, the thermally exfoliated vermiculite has been sonicated in order to grafting with the butyl-imidazolium. A suspension of vermiculite-water with 1% of concentration was sonicated at 20 KHz. This led to the decrease in the size of grains to16 µm after 2 h of treatment. Increasing of sonication time, presence of H2O2, and the increase of the vermiculite concentration have caused an accentuation of sonication effect, this resulted the decreasing of the size to 10 µm. Moreover, a 2% fraction of submicron-sized particles was appeared. The pH of the vermiculite suspensions was increased. The number of the -OH sites was determined by acid-base titration using Gran method. The infrared spectra of the raw and sonicated vermiculites in H2O or containing H2O2 were very similar. In the presence of H2O2, two bands were observed at 1380 and 1460 cm-1. These are due to the presence of carbonates anions formed during sonication in H2O2. XRD spectra showed that the sonication did not affect the vermiculite structure. The grafting was carried out on sonicated samples during 5 h in H2O. This was realized in two steps. In the first step, we grafted 3-chloropropyltrimethoxysilane instead of the –OH sites. In the second step, we conducted a nucleophilic substitution of chlorine with methyl-imidazole. We proved by infrared spectroscopy and Gran method that grafting was real and XRD that this was not an intercalation. Keywords: ;
Authors and Affiliations
S. Terchi, H. Bougherara, B. Kebabi
Keywords
Related Articles
- EP ID EP268336
- DOI -
- Views 108
- Downloads 0
Temperature variation effects in partially depleted SOI n-channel MOSFETs
Silicon-on insulator (SOI) technology has attracted a great attention as a probable alternative candidate for low power, high performances applications. Nowadays electronic is subjected to temperature variations and is,...
Effects of Nickel substitution on crystalline structure and superconducting properties of YBa2Cu3O7- ceramics.
In this study, nickel-substituted Y〖Ba〗_2 (〖Cu〗_(1-x) 〖Ni〗_x )_3 O_(7-δ) ( 0 ≤x ≤4 at.%) superconductor samples were prepared by the conventional solid state reaction method. The effects of Ni substitution on the s...
The effect of excess energy in the simulation of dendritic growth using the phase field model coupled with a CALPHAD database
In this work, we aim to use the Warren-Boettinger model for isothermal solidification to predict the dendritic growth in binary alloys; using the phase field method coupled with a CALPHAD database (CALculation of PHase D...
Developing heat transfer in a solar air channel with arc-shaped baffles: effect of baffle attack angle
The current study illustrates a computational fluid dynamic analysis of 2D steady-state turbulent forced-convection flow and friction loss characteristics through a constant temperature-surfaced rectangular cross section...
Effect of Al doping on the structural and optical properties of SnO2 thin films elaborated by sol-gel technique
In this study, the influence of increasing of the Al concentration on the structural and optical properties of SnO2 thin films were investigated. Pure and aluminum-doped SnO2 thin films were prepared by sol–gel depositio...