Photothermal membrane distillation (PMD) is a promising configuration of membrane distillation (MD), which can overcome the temperature polarization problem and allows using solar thermal energy. However, the effect on wetting of the incorporation of plasmonic nanoparticles (NPs) into a membrane is still unknown. This paper aims supporting the development of photoplasmonic membranes for PMD, by studying their wetting in vacuum MD operation, thanks to two methods recently developed in our group: the ex-situ detection of dissolved tracer intrusion (DDTI) and an in-operando optical method. Different composite membranes with Ag-NPs included in PVDF were elaborated by phase-inversion for checking if the proportion of NPs influences membrane wetting. This study demonstrates the importance of considering wetting in the earlier stages of the development of new membranes. Indeed, whatever the NP load, at global scale partial wetting was detected and the pore wetting ratio increased with the NP load, whereas the PVDF membrane remained un-wetted. Wetting dynamics was highly impacted by the presence of NPs and wetting occurred faster with increasing NP load, thus reducing the duration of the MD operation for the highest load. For limiting short-term wetting, a limited proportion of Ag-NPs (≤25 %) is recommended to membrane manufacturers or developers.

光热膜蒸馏（PMD）是膜蒸馏（MD）的一种很有前途的配置，它可以克服温度极化问题并允许使用太阳能热能。然而，将等离子体纳米粒子（NP）掺入膜中对润湿的影响仍然未知。本文旨在通过研究它们在真空 MD 操作中的润湿性来支持 PMD 的光等离子体膜的开发，这要归功于我们小组最近开发的两种方法：溶解示踪剂侵入 (DDTI) 的异位检测和操作内光学方法. PVDF 中包含 Ag-NPs 的不同复合膜通过相转化法详细说明，以检查 NPs 的比例是否影响膜润湿性。这项研究证明了在新膜开发的早期阶段考虑润湿的重要性。事实上，无论 NP 负载如何，在全球范围内都检测到部分润湿，并且孔润湿率随着 NP 负载的增加而增加，而 PVDF 膜保持未润湿。润湿动力学受到 NP 存在的高度影响，并且随着 NP 负载的增加润湿发生得更快，从而减少了最高负载下 MD 操作的持续时间。为了限制短期润湿，建议膜制造商或开发商使用有限比例的 Ag-NPs (≤25 %)。润湿动力学受到 NP 存在的高度影响，并且随着 NP 负载的增加润湿发生得更快，从而减少了最高负载下 MD 操作的持续时间。为了限制短期润湿，建议膜制造商或开发商使用有限比例的 Ag-NPs (≤25 %)。润湿动力学受到 NP 存在的高度影响，并且随着 NP 负载的增加润湿发生得更快，从而减少了最高负载下 MD 操作的持续时间。为了限制短期润湿，建议膜制造商或开发商使用有限比例的 Ag-NPs (≤25 %)。