Lan Aidong, Mukasyan Alexander
Center for Molecularly Engineered Materials, Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556, USA.
J Phys Chem B. 2005 Aug 25;109(33):16011-6. doi: 10.1021/jp052031s.
An accurate gravimetric apparatus based on a contactless magnetic suspension microbalance was developed. This unit was used to measure the hydrogen storage capacity for a variety of carbon nanotubes (CNTs) at room temperature and hydrogen pressures up to 11.5 MPa. The results show that regardless of their synthesis methods, purities, and nanostructures all investigated CNT products possess relatively low hydrogen storage capacities (<0.2 wt %). For comparison, the adsorption characteristics of theses samples were also measured at a pressure of 0.1 MPa and liquid nitrogen temperature (approximately 77 K) by a conventional volumetric approach. The methodological aspects related to the accuracy of the hydrogen uptake measurements are also discussed.
开发了一种基于非接触式磁悬浮微量天平的精确重量分析装置。该装置用于在室温及高达11.5 MPa的氢气压力下测量各种碳纳米管（CNT）的储氢容量。结果表明，无论其合成方法、纯度和纳米结构如何，所有研究的CNT产品的储氢容量都相对较低（<0.2 wt%）。作为比较，还通过传统的体积法在0.1 MPa压力和液氮温度（约77 K）下测量了这些样品的吸附特性。还讨论了与氢气吸收测量准确性相关的方法学方面。
