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Title: Photo-switchable membrane and method

Abstract

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.times.-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.

Inventors:
;
Issue Date:
Research Org.:
Univ. of Rochester, NY (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1084240
Patent Number(s):
8435333
Application Number:
13/195,508
Assignee:
University of Rochester (Rochester, NY)
Patent Classifications (CPCs):
C - CHEMISTRY C09 - DYES C09K - MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
DOE Contract Number:  
FC52-08NA28302
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Marshall, Kenneth L, and Glowacki, Eric. Photo-switchable membrane and method. United States: N. p., 2013. Web.
Marshall, Kenneth L, & Glowacki, Eric. Photo-switchable membrane and method. United States.
Marshall, Kenneth L, and Glowacki, Eric. Tue . "Photo-switchable membrane and method". United States. https://www.osti.gov/servlets/purl/1084240.
@article{osti_1084240,
title = {Photo-switchable membrane and method},
author = {Marshall, Kenneth L and Glowacki, Eric},
abstractNote = {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.times.-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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2013},
month = {5}
}

Works referenced in this record:

A Polarizer-Free Electro-Optical Switch Using Dye-Doped Liquid Crystal Gels
journal, October 2009