Rawat D S, Krungleviciute V, Heroux L, Bulut M, Calbi M M, Migone A D
Department of Physics, Southern Illinois University, Carbondale, Illinois 62901, USA.
Langmuir. 2008 Dec 2;24(23):13465-9. doi: 10.1021/la8022002.
We present results for the isothermal adsorption kinetics of methane, hydrogen, and tetrafluoromethane on closed-ended single-walled carbon nanotubes. In these experiments, we monitor the pressure decrease as a function of time as equilibrium is approached, after a dose of gas is added to the cell containing the nanotubes. The measurements were performed at different fractional coverages limited to the first layer. The results indicate that, for a given coverage and temperature, the equilibration time is an increasing function of E/(k(B)T), where E is the binding energy of the adsorbate and k(B)T is the thermal energy. These findings are consistent with recent theoretical predictions and computer simulations results that we use to interpret the experimental measurements.
我们展示了甲烷、氢气和四氟甲烷在封闭端单壁碳纳米管上的等温吸附动力学结果。在这些实验中，在向装有纳米管的容器中加入一定剂量的气体后，我们监测随着接近平衡压力随时间的降低情况。测量是在限于第一层的不同分数覆盖率下进行的。结果表明，对于给定的覆盖率和温度，平衡时间是E/(k(B)T)的增函数，其中E是吸附质的结合能，k(B)T是热能。这些发现与我们用于解释实验测量结果的最近理论预测和计算机模拟结果一致。
