Abstract
This paper studies the motion of molecules aligned in an smectic phase in a thermotropic liquid crystal using quasi-elastic Mossbauer gamma-ray scattering. They study the diffusion behavior of the molecules and aim to put forward an explanation to connect the microscopic properties with the system macroscopic behavior
Highlights
The unique macroscopic property and function of soft materials originate from the coexistence of structural ordering and dynamical motion on a molecular scale [1,2]
Understanding microscopic molecular dynamics in the layered structures has been getting more important for the purposes of revealing the fundamental layer effect on molecular dynamics [5], the caged molecular dynamics in the Sm phase as a model system of supercooled glass formers [6,7,8], and the mass transportation mechanism in cell and drug delivery systems [9,10]
For many Sm phases, anisotropic mobility has been discussed by the macroscopic diffusion coefficients parallel (D ) and perpendicular (D⊥) to the layer normal vector obtained by using techniques such as nuclear magnetic resonance (NMR) [13]
Summary
The unique macroscopic property and function of soft materials originate from the coexistence of structural ordering and dynamical motion on a molecular scale [1,2]. Direct observation of interlayer molecular translational motion in a smectic phase and determination of the layer order parameter We evaluated the order parameter of the layer structure and explain the macroscopic diffusion coefficient in the microscopic viewpoint.
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