Abstract The crucial challenge of 2D inorganic nanomaterials-filled composite hydrogel with outstanding mechanical properties was concentrated on the surface modification that was capable to access a better interface between 2D inorganic nanomaterials and hydrogel in past. In this paper, for the first time, we extensively studied the application of as-synthesized 2D Ni-Fe MOF nanosheets with natural organic interface and interlayer structure in PVA hydrogel. The morphology and structure of the as-prepared 2D Ni-Fe MOF/PVA composite hydrogels were determined by a series of characterizations. The results indicated that the as-prepared 2D Ni-Fe MOF/PVA composite hydrogel with porous structure exhibited a desirable dispersion due to the existence of the potential interfacial interaction. Furthermore, the swelling, mechanical and tribological properties of the composite hydrogel were intensively investigated. Dramatically, the tensile strength and compression modulus of the as-prepared 2D Ni-Fe MOF/PVA with 0.1 wt.% filling content were increased by 62.5 % and 113 % relative to pure PVA hydrogel, respectively. Owing to the presence of the interlayer structure of 2D Ni-Fe MOF nanosheets, the friction coefficient of the 2D Ni-Fe/PVA composite hydrogel with 0.15 wt.% filling content was reduced by 41 % compared to pure PVA hydrogel.

中文翻译：

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二维 Ni-Fe MOF 纳米片增强的聚乙烯醇水凝胶具有增强的机械和摩擦学性能

摘要 过去，具有优异机械性能的二维无机纳米材料填充复合水凝胶的关键挑战集中在能够在二维无机纳米材料和水凝胶之间获得更好界面的表面改性。在本文中，我们首次广泛研究了具有天然有机界面和层间结构的合成二维 Ni-Fe MOF 纳米片在 PVA 水凝胶中的应用。所制备的二维 Ni-Fe MOF/PVA 复合水凝胶的形态和结构由一系列表征确定。结果表明，由于潜在的界面相互作用的存在，所制备的具有多孔结构的二维 Ni-Fe MOF/PVA 复合水凝胶表现出理想的分散性。此外，肿胀，对复合水凝胶的机械和摩擦学性能进行了深入研究。引人注目的是，相对于纯 PVA 水凝胶，所制备的具有 0.1 wt.% 填充量的二维 Ni-Fe MOF/PVA 的拉伸强度和压缩模量分别增加了 62.5% 和 113%。由于二维 Ni-Fe MOF 纳米片的层间结构的存在，与纯 PVA 水凝胶相比，填充量为 0.15 wt.% 的二维 Ni-Fe/PVA 复合水凝胶的摩擦系数降低了 41%。