Solid State and Structural Chemistry Unit and §Department of Materials Engineering, Indian Institute of Science , Bangalore 560 012, India.
J Am Chem Soc. 2013 Jun 5;135(22):8121-4. doi: 10.1021/ja402290h. Epub 2013 May 20.
Nanoindentation studies on α,ω-alkanedicarboxylic acids reveal that the elastic modulus, E, shows an odd-even alternation in exactly the same manner as the melting temperature, Tm. These results are consistent with the hypothesis that the strained molecular conformations in the odd diacids are the reasons for these alternations in Tm. The same packing features that lower Tm in the odd acids lead to easy accommodation of the deformation during nanoindentation and hence their low E.
对α，ω-烷二羧酸的纳米压痕研究表明，弹性模量 E 以与熔点 Tm 完全相同的方式呈现奇偶交替。这些结果与以下假设一致，即奇数二羧酸中应变分子构象是导致 Tm 交替的原因。在奇数酸中降低 Tm 的相同堆积特征导致在纳米压痕过程中容易适应变形，从而导致其 E 值较低。
