Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW, 2234, Australia.
School of Chemistry, The University of Sydney, Sydney, NSW, 2006, Australia.
Nat Commun. 2018 Nov 19;9(1):4873. doi: 10.1038/s41467-018-06850-6.
Control of the thermomechanical properties of functional materials is of great fundamental and technological significance, with the achievement of zero or negative thermal expansion behavior being a key goal for various applications. A dynamic, reversible mode of control is demonstrated for the first time in two Prussian blue derivative frameworks whose coefficients of thermal expansion are tuned continuously from negative to positive values by varying the concentration of adsorbed CO. A simple empirical model that captures site-specific guest contributions to the framework expansion is derived, and displays excellent agreement with the observed lattice behaviour.
功能材料的热机械性能的控制具有重要的基础和技术意义，实现零或负热膨胀行为是各种应用的关键目标。本文首次展示了在两个普鲁士蓝衍生物框架中，通过改变吸附的 CO 浓度，连续调节热膨胀系数，从负值到正值，实现了一种动态、可逆的控制模式。本文还推导了一个简单的经验模型，该模型捕获了客体对框架膨胀的特定位置贡献，并与观察到的晶格行为非常吻合。
