Two-dimensional lamellar membranes are promising for efficient molecule transfer, while the underlying transfer mechanism is rarely elucidated. Herein, heterostructured nanosheets are prepared by self-assembling small-sized hydrophilic cyanuric acid melamine and hydrophobic g-C₃N₄ nanosheets. Resultant lamellar membranes show comparable affinity to polar and nonpolar solvents, allowing them to dissolve on membrane surface and diffuse through membrane channels. Results demonstrate that for lamellar membranes with distinct wettability, the permeance difference for polar solvents is originated from dissolution and diffusion processes, while that for nonpolar solvents is stemmed from dissolution process. Accordingly, corresponding equations which are suitable for heterostructured lamellar membranes are established. Importantly, polar solvents are induced to form ordered arrangement in hydrophilic nanodomains and then maintain the ordered state in hydrophobic nanodomains, affording a low-resistance transfer and high acetonitrile permeance of 1025 L m⁻² h⁻¹ bar⁻¹. In contrast, nonpolar solvents with disordered arrangement exhibit lower permeance than that of polar ones.

中文翻译：

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二维异质层状膜中的分子转移机制：溶解和扩散的影响

二维层状膜有望用于有效的分子转移，而基本的转移机制很少被阐明。在此，通过自组装小尺寸亲水性氰尿酸三聚氰胺和疏水性g -C ₃ N _{4制备异质结构纳米片。}纳米片。所得层状膜显示出与极性和非极性溶剂相当的亲和力，使它们能够溶解在膜表面并通过膜通道扩散。结果表明，对于具有不同润湿性的层状膜，极性溶剂的渗透差异源于溶解和扩散过程，而非极性溶剂的渗透差异源于溶解过程。因此，建立了适用于异质结构层状膜的相应方程。^{重要的是，极性溶剂被诱导在亲水纳米域中形成有序排列，然后在疏水纳米域中保持有序状态，从而提供 1025 L m -2}  h ^-1  bar的低电阻转移和高乙腈渗透率^-1。相反，无序排列的非极性溶剂表现出比极性溶剂低的渗透性。