Temperature-dependent phonon transport in nanocellulose materials

Nanocellulose-based foams can display super-insulating properties which is proposed to be controlled by interfacial phonons scattering. We propose to use inelastic neutron scattering to probe the phonon density of states (DOS) as a function of temperature and follow the phase transitions related to the hydrogen bonds. Combing the phonon DOS with simulations will help us decipher the dynamics within our samples and clarify the underlying mechanisms behind the phonon transport and the effect temperature has, aiding the future development of super insulating materials.

基于纳米纤维素（Nanocellulose）的泡沫材料可展现超隔热性能，现有研究认为该性能可通过界面声子散射进行调控。本研究拟采用非弹性中子散射（inelastic neutron scattering）技术，探测随温度变化的声子态密度（phonon density of states, DOS），并追踪与氢键相关的相变过程。将声子态密度数据与模拟计算相结合，有助于解析样品内部的动力学行为，阐明声子输运背后的内在机制以及温度的影响效应，从而助力超隔热材料的后续研发。