申请人:Marshall Kenneth L.
公开号:US20120025136A1
公开(公告)日:2012-02-02
Switchable gas permeation membranes in which a photo-switchable low-molecular-weight liquid crystalline (LC) material acts as the active element, and a method of making such membranes. Different LC eutectic mixtures were doped with mesogenic azo dyes and infused into track-etched porous membranes with regular cylindrical pores. Photo-induced isothermal phase changes in the imbibed mesogenic material afforded large, reversible changes in the permeability of the photo-switchable membrane to nitrogen. For example, membranes imbibed with a photo-switchable cyanobiphenyl LC material demonstrated low permeability in the nematic state, while the photo-generated isotropic state demonstrated a 16×-greater sorption coefficient. Both states obey a high linear sorption behavior in accordance with Henry's Law. In contrast, membranes imbibed with a photo-switchable phenyl benzoate LC material showed the opposite permeability behavior to the biphenyl-imbibed membrane, along with nonlinear sorption behavior.
可切换气体渗透膜,其中光开关低分子液晶(LC)材料作为活性元素,并制造这种膜的方法。不同的LC共晶混合物掺杂有介向偶氮染料,并注入具有规则圆柱形孔的轨迹刻蚀多孔膜中。吸入的介向材料中的光诱导等温相变导致光开关膜对氮的渗透性发生大的、可逆的变化。例如,注入光开关氰基联苯LC材料的膜在向列相状态下表现出低的渗透性,而光产生的等向相状态表现出16倍更大的吸附系数。两种状态都遵循亨利定律的高线性吸附行为。相比之下,注入光开关苯基苯甲酸酯LC材料的膜表现出与联苯注入膜相反的渗透性行为,以及非线性吸附行为。