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发明公开
CN105315482A 各向异性的纳米纤维素/蒙脱土复合气凝胶及其制备方法 无效 - 驳回

各向异性的纳米纤维素/蒙脱土复合气凝胶及其制备方法
摘要：
本发明公开了一种各向异性的纳米纤维素/蒙脱土复合气凝胶，由纳米纤维素悬浮液与蒙脱土悬浮液混合后冰冻铸造而成。并公开了其制备方法，其步骤包括：(1)分别配制纳米纤维素悬浮液与蒙脱土悬浮液；(2)将蒙脱土悬浮液与纳米纤维素悬浮液混合成均匀分散的纳米纤维素/蒙脱土悬浮液；(3)将纳米纤维素/蒙脱土悬浮液冰冻铸造成纳米纤维素/蒙脱土复合气凝胶。本发明通过添加蒙脱土提高纳米纤维素气凝胶的刚度和耐热性，并通过定向冷淡干燥法制备成一种各向异性的蜂窝状气凝胶，由于此气凝胶的受力主要依靠材料的细胞壁拉伸而非材料自身的弯曲变形，因而其力学性能优于通过普通冷冻干燥法制备的各向同性的泡沫状纳米纤维素/蒙脱土复合气凝胶。
摘要（英）：

The invention discloses anisotropic nano-cellulose/montmorillonite composite aerogel. The aerogel is prepared by mixing a nano-cellulose suspension with a montmorillonite suspension and performing freeze casting. The invention further discloses a preparation method of the aerogel. The method comprises the following steps: (1) respectively preparing nano-cellulose suspension and montmorillonite suspension; (2) mixing the montmorillonite suspension with the nano-cellulose suspension to form uniformly dispersed nano-cellulose/montmorillonite suspension; (3) performing freeze casting on the nano-cellulose/montmorillonite suspension to obtain the nano-cellulose/montmorillonite composite aerogel. The rigidity and heat tolerance of the nano-cellulose aerogel are improved by adding the montmorillonite, and the anisotropic honeycomb shaped aerogel is prepared by means of a directional freeze drying method; and the mechanical performance of the anisotropic nano-cellulose/montmorillonite composite aerogel is superior to that of anisotropic foam-shaped nano-cellulose/montmorillonite composite aerogel prepared by a conventional freeze drying method since the stress of the aerogel mainly depends on cell wall stretching of the material rather than bending deformation of the material.

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