Measurement of conductivity and permittivity on samples sealed in nuclear magnetic resonance tubes.
Measurement of conductivity and permittivity on samples sealed in nuclear magnetic resonance tubes.
复制标题
测量密封在核磁共振管中的样品的电导率和介电常数。
DOI：
10.1063/1.4816134
复制
发表时间：
2013
期刊：
影响因子：
--
通讯作者：
R. Richert
中科院分区：
文献类型：
--
作者：
W. Huang;C. Angell;J. Yarger;R. Richert
我们提出了一种宽带阻抗谱仪器，旨在测量电导率和闪烁电容率的样品密封在玻璃管，如标准的5毫米管用于核磁共振实验。的校准和校正所需的提取样品本身的介电特性进行了概述。它表明，良好的直流电导率的值的估计，可以得到即使没有校正的玻璃或空气对整体阻抗的影响。该方法通过比较从密封在核磁共振管中的样品获得的数据与从标准电介质电池，使用甘油和丁基甲基咪唑六氟磷酸盐作为分子和离子液体的各自的例子进行验证。这种仪器和方法可能被证明是有用的介电常数和电导率的其他研究中，接触的金属电极或周围的大气需要避免。
We present a broadband impedance spectroscopy instrument designed to measure conductivity and∕or permittivity for samples that are sealed in glass tubes, such as the standard 5 mm tubes used for nuclear magnetic resonance experiments. The calibrations and corrections required to extract the dielectric properties of the sample itself are outlined. It is demonstrated that good estimates of the value of dc-conductivity can be obtained even without correcting for the effects of glass or air on the overall impedance. The approach is validated by comparing data obtained from samples sealed in nuclear magnetic resonance tubes with those from standard dielectric cells, using glycerol and butylmethylimidazolium-hexafluorophosphate as respective examples of a molecular and an ionic liquid. This instrument and approach may prove useful for other studies of permittivity and conductivity where contact to the metal electrodes or to the ambient atmosphere needs to be avoided.