Data underlying the publication: Crosslinking PDADMAC/PSS polyelectrolyte multilayer membranes for stability at high salinity

Dataset for the following publication: Xiao Zhang, Antoine J.B. Kemperman, Henk Miedema, Esra te Brinke, Wiebe M. de Vos. Crosslinking PDADMAC/PSS polyelectrolyte multilayer membranes for stability at high salinity. Journal of Membrane Science, Volume 725, 2025, 124007, ISSN 0376-7388,DOI:https://doi.org/10.1016/j.memsci.2025.124007.(https://www.sciencedirect.com/science/article/pii/S0376738825003205)Data collection: This data was collected at Wetsus ( European centre of excellence for sustainable water technology), Leeuwarden (NL), and the Department of Membrane Science and Technology, University of Twente, Enschede (NL).Funding: This work is part of the project EMPOWER, which has received funding from the European Union’s Horizon 2020 Research &amp; Innovation funding programme under the Marie Skłodowska-Curie Action COFUND, grant agreement No 101034321.<br>The data includes the following datasets:<br>Ellipsometry: For the determination of dry and wet thicknesses of 4.5 bilayers of PDADMAC/PSS multilayer on a silicon wafer.<br>Filtration: Includes experimental results of pure water permeability and BSA (bovine serum albumin) retention of fabricated support membranes. BSA retention was determined based on a calibration curve using BSA concentrations from 1 to 200 ug/mL. Results also include experimental data of permeability (pure water, salt solution) and salt retentions of PDADMAC/PSS coated (non-crosslinked &amp; crosslinked) nanofiltration membranes. Osmotic pressure correction was performed for the permeability during filtration with NaCl solutions with different concentrations.<br>GPC: Includes raw data of PEG concentrations in the feed and permeate samples obtained by GPC (gel permeation chromatography ). Filtration experiments were performed using a feed solution containing PEGs of different molecular weights (MW), feed and permeate samples were then collected and analyzed by GPC. Sieving curves can be obtained by calculating the ratio of permeate concentration/feed concentration of each experiment. Molecular weight cut-off (MWCO) is defined as 10 % sieving (90 % retention) of the PEG with a certain MW.<br>Reflectometry: Includes the absorption of PDADMAC and PSS in 500 mM NaCl onto a silicon wafer as a function of the number of layers (growth curve). And includes the desorption of the coated multilayer (non-crosslinked and crosslinked under different conditions) after flushing with the anionic surfactant SDS (sodium dodecyl sulfate).<br>SEM: Includes the SEM (scanning electron microscope) image of the cross-sections of fabricated support membranes with different polymer concentrations. Membranes were cut in liquid nitrogen to obtain a sharp cross-section for the imaging.

本数据集对应以下发表文献：张晓（Xiao Zhang）、安托万·J·B·坎佩尔曼（Antoine J.B. Kemperman）、亨克·米德马（Henk Miedema）、埃斯拉·特布林克（Esra te Brinke）、维伯·M·德沃斯（Wiebe M. de Vos）。研究论文题为《用于高盐环境稳定的PDADMAC/PSS聚电解质多层膜》，发表于《Journal of Membrane Science》2025年第725卷，文章编号124007，ISSN 0376-7388，DOI：https://doi.org/10.1016/j.memsci.2025.124007（https://www.sciencedirect.com/science/article/pii/S0376738825003205）。
数据采集：本批数据采集于荷兰吕伐登的可持续水技术欧洲卓越中心Wetsus，以及荷兰恩斯赫德特文特大学膜科学与技术系。
资助信息：本研究隶属于EMPOWER项目，该项目获欧盟地平线2020研究与创新框架计划下的玛丽·居里行动COFUND资助，资助协议编号为101034321。
本数据集包含以下子数据集：
1. 椭偏仪（Ellipsometry）数据：用于测定硅片上制备的4.5层PDADMAC/PSS多层膜的干态与湿态厚度。
2. 过滤实验（Filtration）数据：包含制备的支撑膜的纯水渗透率与牛血清白蛋白（BSA, bovine serum albumin）截留率实验结果。BSA截留率基于浓度范围为1~200 μg/mL的BSA校准曲线测定。此外还包含PDADMAC/PSS涂层（未交联与交联）纳滤膜的纯水、盐溶液渗透率与盐截留率实验数据。针对不同浓度NaCl溶液过滤过程中的渗透率进行了渗透压校正。
3. 凝胶渗透色谱（GPC, gel permeation chromatography）数据：包含进料液与渗透液样品中PEG浓度的原始检测数据。实验采用含不同分子量（MW）PEG的进料液进行过滤实验，随后收集进料与渗透液样品并通过GPC分析。通过计算各实验的渗透液浓度/进料液浓度比值，可得到筛分曲线。分子量截留值（MWCO）定义为对特定分子量PEG的10%筛分率（即90%截留率）。
4. 反射仪（Reflectometry）数据：包含500 mM NaCl溶液中PDADMAC与PSS在硅片上的吸附量随层数变化的生长曲线；同时包含经阴离子表面活性剂十二烷基硫酸钠（SDS, sodium dodecyl sulfate）冲洗后，不同条件下制备的未交联与交联多层涂层的解吸附数据。
5. 扫描电子显微镜（SEM, scanning electron microscope）数据：包含不同聚合物浓度下制备的支撑膜横截面SEM图像。实验采用液氮冷冻切割方式获取锐利的膜横截面以用于成像。