摘要：【中文】本发明公开了一种本征超疏水纳米纤维素气凝胶及其制备方法。制备方法为：在纳米纤维素分散液中加入交联剂得到前驱体溶液，将其进行取向冷冻及干燥，制备三维有序纳米纤维素气凝胶；将气凝胶浸渍于低表面能聚合物/微纳无机颗粒分散液中，经固化及干燥制备本征超疏水纳米纤维素气凝胶。本发明以纳米纤维素纤维分散液为前驱体，冰晶为模板，通过改变温度梯度，调控冰晶成核及生长的速度与方向，通过冷冻干燥去除冰模板，制备三维有序的纳米纤维素气凝胶材料；通过添加聚二甲基硅氧烷和微米/纳米二氧化钛颗粒，构筑低表面能聚合物/微纳粗糙结构的超疏水气凝胶。本发明制备的纳米纤维素气凝胶具有优异的疏水性能，可以应用于保温防寒及吸油领域。 【EN】The invention discloses an intrinsic super-hydrophobic nano cellulose aerogel and a preparation method thereof. The preparation method comprises the following steps: adding a cross-linking agent into the nano-cellulose dispersion liquid to obtain a precursor solution, and performing oriented freezing and drying on the precursor solution to prepare the three-dimensional ordered nano-cellulose aerogel; and (3) soaking the aerogel in a low surface energy polymer/micro-nano inorganic particle dispersion liquid, and curing and drying to prepare the intrinsic super-hydrophobic nano cellulose aerogel. The invention takes nano-cellulose fiber dispersion liquid as a precursor and ice crystals as a template, regulates and controls the nucleation and growth speed and direction of the ice crystals by changing the temperature gradient, and removes the ice template by freeze drying to prepare a three-dimensional ordered nano-cellulose aerogel material; by adding polydimethylsiloxane and micron/nano titanium dioxide particles, the super-hydrophobic aerogel with a low surface energy polymer/micro-nano coarse structure is constructed. The nano-cellulose aerogel prepared by the invention has excellent hydrophobic property, and can be applied to the fields of heat preservation, cold protection and oil absorption.

摘要：【中文】本发明公开了一种轻质保暖柔性壳聚糖/纳米纤维素气凝胶及其制备方法。制备方法为：将纳米纤维素水分散液与壳聚糖溶液共混，加入交联剂，分散均匀，得到均匀的前驱体溶液；将预冷的前驱体溶液置于自制模具中，用液氮冷冻至完全固体；随后置于冷冻干燥器中冷冻干燥，得到壳聚糖/纳米纤维素气凝胶样品。所述壳聚糖/纳米纤维素二元气凝胶具有长程有序的三维网络结构，密度小、热导率低、压缩回弹性能优异，属于气凝胶材料制备领域。本发明利用冰晶成核及生长对溶液中溶质的排挤作用，构筑长程有序的气凝胶三维结构，赋予气凝胶材料质轻、保暖、压缩可回复的特性，可作为保暖防寒材料使用。 【EN】The invention discloses a light warm-keeping flexible chitosan/nano-cellulose aerogel and a preparation method thereof. The preparation method comprises the following steps: blending the nano-cellulose aqueous dispersion and the chitosan solution, adding a cross-linking agent, and uniformly dispersing to obtain a uniform precursor solution; placing the pre-cooled precursor solution into a self-made mold, and freezing the precursor solution to be completely solid by using liquid nitrogen; and then placing the mixture in a freeze dryer for freeze drying to obtain a chitosan/nano cellulose aerogel sample. The chitosan/nano cellulose binary aerogel has a long-range ordered three-dimensional network structure, is small in density, low in heat conductivity and excellent in compression resilience, and belongs to the field of aerogel material preparation. The invention utilizes the displacement effect of ice crystal nucleation and growth on solute in the solution to construct a long-range ordered aerogel three-dimensional structure, endows the aerogel material with the characteristics of light weight, heat preservation and recoverable compression, and can be used as a heat preservation and cold protection material.

摘要：【中文】本发明公开了一种结构有序壳聚糖/纳米纤维素复合气凝胶及其制备方法。所述制备方法为：将壳聚糖溶液与交联剂混合，加热形成水凝胶，将壳聚糖水凝胶取向冷冻至完全固体；随后干燥，得到壳聚糖气凝胶；将壳聚糖气凝胶浸渍于纳米纤维素分散液中，进行冷冻干燥，得到长程有序结构与蜂窝状结构构筑的壳聚糖/纳米纤维素复合气凝胶。所述壳聚糖/纳米纤维素复合气凝胶具有长程有序与蜂窝状网络相结合的有序结构，具有密度小、热导率低、压缩回弹性能优异等性能，属于气凝胶材料制备领域，可应用于保温隔热、组织工程等领域。 【EN】The invention discloses a chitosan/nano-cellulose composite aerogel with an ordered structure and a preparation method thereof. The preparation method comprises the following steps: mixing the chitosan solution with a cross-linking agent, heating to form hydrogel, and directionally freezing the chitosan hydrogel to be completely solid; then drying to obtain chitosan aerogel; and (3) soaking the chitosan aerogel in the nano-cellulose dispersion liquid, and freeze-drying to obtain the chitosan/nano-cellulose composite aerogel constructed by the long-range ordered structure and the honeycomb structure. The chitosan/nano-cellulose composite aerogel has an ordered structure combining long-range order and a honeycomb network, has the performances of small density, low thermal conductivity, excellent compression resilience and the like, belongs to the field of aerogel material preparation, and can be applied to the fields of heat preservation, heat insulation, tissue engineering and the like.