Role of Dielectric Constant on Ion Transport: Reformulated Arrhenius Equation
Role of Dielectric Constant on Ion Transport: Reformulated Arrhenius Equation
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DOI：
10.1155/2016/2527013
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发表时间：
2016-01-01
影响因子：
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通讯作者：
Aziz, Shujahadeen B.
中科院分区：
文献类型：
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作者：
Aziz, Shujahadeen B.
采用溶液浇铸法制备了壳聚糖基固体聚合物电解质和纳米复合聚合物电解质。XRD结果表明壳聚糖（CS）与LiTf盐之间发生了络合作用。纳米复合固体聚合物电解质的衍射图的解卷积表明，随着氧化铝含量增加到4 wt.%，无定形域的增加。进一步掺入氧化铝纳米颗粒（6至10重量% Al 2 O3）导致结晶度增加（大的微晶尺寸）。SEM和EDX分析结果与XRD分析结果吻合较好。直流电导率和介电常数随Al 2 O3浓度的变化趋势相似。TEM图像被用来解释空间电荷和阻塞效应的现象。根据不同温度下直流电导率对介电常数的平滑指数行为，提出了改进的阿克里尼乌斯方程（sigma（（epsilon '，T））= sigma（o）exp（（-Ea/KB epsilon' T）. DC电导率相对于1000/（λ ′ × T）的更线性的行为揭示了介电常数在Arkenius方程中的关键作用。从直流电导率与1000/T的非线性关系可以看出阿克里乌斯方程的缺点。
Solid and nanocomposite polymer electrolytes based on chitosan have been prepared by solution cast technique. The XRD results reveal the occurrence of complexation between chitosan (CS) and the LiTf salt. The deconvolution of the diffractogram of nanocomposite solid polymer electrolytes demonstrates the increase of amorphous domain with increasing alumina content up to 4wt.%. Further incorporation of alumina nanoparticles (6 to 10 wt.% Al2O3) results in crystallinity increase (large crystallite size). The morphological (SEM and EDX) analysis well supported the XRD results. Similar trends of DC conductivity and dielectric constant with Al2O3 concentration were explained. The TEM images were used to explain the phenomena of space charge and blocking effects. The reformulated Arrhenius equation (sigma((epsilon',T)) = sigma(o)exp((-Ea/KB epsilon'T))) was proposed from the smooth exponential behavior of DC conductivity versus dielectric constant at different temperatures. The more linear behavior of DC conductivity versus 1000/(epsilon' x T) reveals the crucial role of dielectric constant in Arrhenius equation. The drawbacks of Arrhenius equation can be understood from the less linear behavior of DC conductivity versus 1000/T The relaxation processes have been interpreted in terms of Argand plots.