Ionic Conductivity in Gelatin-Based Hybrid Solid Electrolytes:The Non-trivial Role of Nanoclay
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2014年第11期
论文作者：Ali Ghadami Nader Taheri Qazvini Nasser Nikfarjam
文章页码：1096 - 1102
摘 要：In this study, the ionic conductivity behavior in hybrid gelatin-based transparent electrolytes including various types of nanoclays with different size, shape and surface properties was characterized. The effects of nanoclay type and nanoclay concentration as well as different experimental conditions, e.g., p H, temperature and crosslinking were also investigated. In general, the impedance spectroscopy results suggested a nontrivial role for nanoclay. Regardless of the nanoclay type, the ionic conductivity slightly increased first and then decreased by increasing the nanoclay concentration. Furthermore, among sodium montmorillonite（Na t MMT）, lithium montmorillonite（Li t MMT）, laponite and hydrotalcite, the hybrid electrolytes prepared by Li t MMT showed higher ionic conductivity. The results also showed that the chemical crosslinking along with sample preparation at optimum p H, where the gelatin chains might be efficiently adsorbed on exfoliated,negatively charged clay nanosheets, plays an important role. In comparison with the ionic conductivity of the neat sample at room temperature（w107S cm1）, a ten-fold increase was observed for the crosslinked sample containing 2 wt% of Li t MMT prepared at optimum p H 3.5. The conductivity behavior as a function of temperature revealed the obedience with the Vogel e Fulcher e Tammann（VFT） model for all samples,suggesting the important role of segmental motions in the ionic conductivity. Finally, a qualitative explanation was presented for the mechanism of the ionic conduction in gelatin-nanoclay hybrid electrolytes.
Ali Ghadami1，Nader Taheri Qazvini1,2，Nasser Nikfarjam1
1. Polymer Division,School of Chemistry,College of Science,University of Tehran2. Biomaterials Research Center (BRC),University of Tehran
摘 要：In this study, the ionic conductivity behavior in hybrid gelatin-based transparent electrolytes including various types of nanoclays with different size, shape and surface properties was characterized. The effects of nanoclay type and nanoclay concentration as well as different experimental conditions, e.g., p H, temperature and crosslinking were also investigated. In general, the impedance spectroscopy results suggested a nontrivial role for nanoclay. Regardless of the nanoclay type, the ionic conductivity slightly increased first and then decreased by increasing the nanoclay concentration. Furthermore, among sodium montmorillonite（Na t MMT）, lithium montmorillonite（Li t MMT）, laponite and hydrotalcite, the hybrid electrolytes prepared by Li t MMT showed higher ionic conductivity. The results also showed that the chemical crosslinking along with sample preparation at optimum p H, where the gelatin chains might be efficiently adsorbed on exfoliated,negatively charged clay nanosheets, plays an important role. In comparison with the ionic conductivity of the neat sample at room temperature（w107S cm1）, a ten-fold increase was observed for the crosslinked sample containing 2 wt% of Li t MMT prepared at optimum p H 3.5. The conductivity behavior as a function of temperature revealed the obedience with the Vogel e Fulcher e Tammann（VFT） model for all samples,suggesting the important role of segmental motions in the ionic conductivity. Finally, a qualitative explanation was presented for the mechanism of the ionic conduction in gelatin-nanoclay hybrid electrolytes.
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