Babut Thomas, Semsarilar Mona, Rolland Marc, Quemener Damien
Institut Européen des Membranes, IEM, UMR 5635, Univ Montpellier, ENSCM, CNRS, F-34090 Montpellier, France.
Polymers (Basel). 2021 Nov 18;13(22):3983. doi: 10.3390/polym13223983.
Organize the matter on an increasingly small scale is sought in order to increase the performance of materials. In the case of porous materials, such as filtration membranes, a compromise must be found between the selectivity provided by this nanostructuring and a permeability in particular linked to the existing pore volume. In this work, we propose an innovative waterborne approach consisting in co-assembling peptide amphiphiles (PA) which will provide nanostructuring and polyelectrolytes which will provide them with sufficient mechanical properties to sustain water pressure. C-VAKG-NH PA nanocylinders were synthesized and co-assembled with poly(sodium 4-styrenesulfonate) (PSSNa) into porous nano-fibrous network via electrostatic interactions. The ratio between C-VAKG-NH and PSSNa was studied to optimize the material structure. Since spontaneous gelation between the two precursors does not allow the material to be shaped, various production methods have been studied, in particular via tape casting and spray-coating. Whereas self-supported membranes were mechanically weak, co-assemblies supported onto commercial ultrafiltration membranes could sustain water pressure up to 3 bars while a moderate permeability was measured confirming the existence of a percolated network. The produced membrane material falls into the ultrafiltration range with a pore radius of about 7.6 nm.
为了提高材料的性能，人们试图在越来越小的尺度上组织物质。对于多孔材料，如过滤膜，必须在这种纳米结构提供的选择性与特别是与现有孔体积相关的渗透率之间找到折衷方案。在这项工作中，我们提出了一种创新的水性方法，该方法包括共同组装肽两亲物（PA），其将提供纳米结构，以及聚电解质，其将为它们提供足够的机械性能以承受水压。合成了C-VAKG-NH PA纳米圆柱体，并通过静电相互作用将其与聚（4-苯乙烯磺酸钠）（PSSNa）共同组装成多孔纳米纤维网络。研究了C-VAKG-NH与PSSNa之间的比例以优化材料结构。由于两种前体之间的自发凝胶化不允许材料成型，因此研究了各种生产方法，特别是通过流延铸膜和喷涂。虽然自支撑膜的机械性能较弱，但支撑在商业超滤膜上的共组装体可以承受高达3巴的水压，同时测量到适度的渗透率，证实了存在渗透网络。所生产的膜材料属于超滤范围，孔半径约为7.6纳米。
