配向セルロースナノファイバーを内包する伸縮性の高引張強度エアロゲル

我们发现了一种新的、简单的、可扩展的和可控的方法来获得任何浓度的纤维素纳米纤维胶体，使用控制冷凝法。所有的压缩CNF材料都是高度均匀的。通过质子化（H+）或配位（Al3+）对缩合后的CNF水凝胶进行进一步凝胶化，可以得到一系列含水量为70-90%的透明和强水凝胶，其抗拉强度和模量分别大于9 MPa和480 MPa。该材料的含水量、强度和模量均接近甚至优于肌肉和软骨，在生物医学领域具有广阔的应用前景。超临界干燥得到了一系列可拉伸率超过20%的CNF气凝胶，抗拉强度和模量分别达到8mpa和100mpa，但导热系数仅为19.3 mW/mK。我们的气凝胶，既强又超绝缘，在Ashby图中建立了一个关于强度和导热性的新区域。我们已经就这个项目提交了专利。相关稿件正在撰写中，并将提交给材料科学的几家主要期刊。

We have discovered a new, facile, scalable and controllable method to get cellulose nanofibril colloids at any concentrations, using controlled condensation method. All of the condensed CNF materials are highly homogeneous. Further gelation of the condensed CNF hydrogels by protonation (H+) or coordination (Al3+) affords a series of transparent and strong hydrogels with water content of 70-90%, which exhibit tensile strength and modulus more than 9 MPa and 480 MPa, respectively. The water content, strength and modulus are very close or even superior to those of muscles and cartilages and would very promising in the biomedical applications. When dried by supercritical method, we obtained a series of CNF aerogels which is stretchable over 20%, with tensile strength and modulus reach 8 MPa and 100 MPa, respectively, yet still possess very low thermal conductivity at 19.3 mW/mK. Our aerogels, both strong and super-insulating, set a new region in the Ashby plots regarding strength and thermal conductivity.We have submitted a patent regarding this project. The related manuscript is now under construction, and will submit to several major journals in materials science.