Université de Franche-Comté, Institut UTINAM-UMR CNRS 6213, 16 Route de Gray, 25030 Besançon Cedex, France.
J Colloid Interface Sci. 2010 Apr 1;344(1):221-7. doi: 10.1016/j.jcis.2009.12.033. Epub 2009 Dec 24.
Alternate adsorption of polyanions and polycations on a polyethersulfone (PES) membrane was studied by the tangential streaming potential method using a parallel-plate channel to investigate the properties of the outer surface of the membrane. These streaming potential data were complemented by diffusion experiments and by membrane potential measurements in order to characterize the inner surface of the membrane. Tangential streaming potential measurements demonstrated that after completing a bilayer of poly(allylamine hydrochloride) (PAH) and poly(sodium 4-styrene sulfonate) (PSS), periodic variations in the zeta potential between positive and negative values appeared for multilayer films obtained from membrane dipped in polyelectrolyte (PE) solutions at 10 g/L. On the contrary, the zeta potential was always positive when multilayer films were obtained from 1 and 5 g/L polyelectrolyte concentration solutions. Diffusion experiments carried out with unmodified and modified membranes showed a decrease in the solute flux after functionalization of the membrane by several polyelectrolyte bilayers, indicating that the diffusional resistance of the PE layers contributes significantly to the overall resistance to diffusion of the modified membrane. By means of membrane potential measurements the pore walls of the membrane were functionalized since the charge of its pore walls was modified even if it is difficult to discriminate between the contribution of the membrane and that of the multilayer buildup.
通过切向流动电势法，使用平行板通道研究了聚醚砜（PES）膜上聚阴离子和聚阳离子的交替吸附，以研究膜外表面的性质。这些流动电势数据通过扩散实验和膜电位测量得到补充，以表征膜的内表面。切向流动电势测量表明，在完成聚（盐酸烯丙胺）（PAH）和聚（4-苯乙烯磺酸钠）（PSS）的双层之后，对于从在 10 g/L 的聚电解质（PE）溶液中浸渍的膜获得的多层膜，在正和负之间的 ζ 电位出现周期性变化值。相反，当从 1 和 5 g/L 的聚电解质浓度溶液获得多层膜时，ζ 电位始终为正。用未改性和改性膜进行的扩散实验表明，在通过几个聚电解质双层对膜进行功能化后，溶质通量降低，这表明 PE 层的扩散阻力对改性膜的整体扩散阻力有很大贡献。通过膜电位测量，对膜的孔壁进行了功能化，因为即使难以区分膜和多层堆积的贡献，其孔壁的电荷也发生了变化。
