Characterization of the Alkyl-Ammonium Adsorption Amount in Organomontmorillonite and its Effect on the Viscosity of Organomontmorillonite Gel
| Periodical | Advanced Materials Research (Volume 158) |
|---|---|
| Main Theme | Powder Technology and Application III |
| Edited by | Xianjun Lu and Jun Qiu |
| Pages | 25-34 |
| DOI | 10.4028/www.scientific.net/AMR.158.25 |
| Citation | Yu Qin Liu et al., 2010, Advanced Materials Research, 158, 25 |
| Online since | November, 2010 |
| Authors | Yu Qin Liu, Xian Jun Lu, Jun Qiu |
| Keywords | Effective Dosage, Gelating Property, Organomontmorillonite, Surface Modification, Thermal Property |
| Price | US$ 28,- |
The structure and thermal property of organomontmorillonite (OM) were studied by X-ray diffraction (XRD), differential thermal analysis (DTA), and thermalgravimetric analysis (TGA).Based on the thermal property of OM, a new method for quantitative characterization of the alkyl-ammonium adsorbed in the layers was established, and the influence of adsorption amount on the viscosity of OM gel was examined. Changes in the basal spacing of OMs and Na-montmorillonite (Na-mont) indicated that alky-ammonium ions intercalated into the montmorillonite layers. TGA results showed that OM and Na-mont had different thermal property, Na-mont held more free water in the layers. The intercalated alkyl-ammonium in OMs decomposed at the temperature of 230~480°C. Effective dosage (DOSeffective) has significant influence on the viscosity of OM gel. Under the optimal DOSeffective(1.1~1.3CEC), the alkyl-ammonium cations can fully cover the exchangeable site in the layers, then the “card-house” structure formed. Structure of the alkyl-ammonium cations determines the intercalation efficiency, the longer the carbon chain, the higher the intercalation efficiency. The intercalation efficiency has no evident correlativity with the viscosity; however, structure of the alkyl-ammonium cations determines their arrangement in the layers.
