Chiral Templating of Polycarbonate Membranes by Pinene Using the Modified Atomic Layer Deposition Approach

Abstract

In this article, a chiral templating of polycarbonate (PC) membrane by (-)-α-pinene using the atomic layer deposition (ALD) approach is investigated. The templating with enantiomer of (-)α-pinene, used as a case compound, was performed either on the original commercial PC membrane or on the PC membrane with a beforehand deposited Al2O3 layer. The efficiency of the templating was assessed by a difference of membrane ability to adsorb/absorb (-)-α-pinene, (+)α-pinene and their racemic mixture, using a very sensitive gas sorption analyzer. The results clearly show that the solution-diffusion mechanism rather than the sieving mechanism applied for adsorption/absorption of (-/+)-α-pinene enantiomers, which have the same size of the molecule.The PC membrane with the pre-deposited Al2O3 before the (-)-α-pinene templating shows a significantly higher sorption of (-)-α-pinene compared to (+)-α-pinene and racemate, which clearly demonstrates presence of a chiral recognition effect.

Controlling Nanoscale Pore Size and Wall Composition in Polycarbonate Membranes via Atomic Layer Deposition and Sequential Infiltration Synthesis: Implications for High Water Permeance

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Removal of Ibuprofen from Water by Different Types Membranes

“…Accordingly, in order to essentially modify the surface of the PDMS membrane surface, a silane agent was repetitively dosed using a traditional ALD sequence, i.e., pulse and purge steps. This approach, previously presented in a recent work and referred to as a modified ALD approach [ 44 ], led to the desired surface modification of PDMS membranes with silane molecules.…”