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Flexible Dry Hydrogel with Lamella-Like Structure Engineered via Dehydration in Poor Solvent
CCS Chemistry ( IF 9.4 ) Pub Date : 2019-11-04 , DOI: 10.31635/ccschem.019.201900007
Feilong Zhang 1, 2 , Jiajia Zhou 3 , Zhen Gu 1 , Man Yang 1 , Siheng Li 1 , Yongyang Song 1 , Jun-Bing Fan 1 , Jingxin Meng 1 , Peiyi Wu 4 , Lei Jiang 1, 2, 3 , Shutao Wang 1, 2
Affiliation  

Hydrogels are among the most promising biologic materials in recent technology with numerous desired applications, including serving as biosensors, drug delivery vehicles, and tissue-engineered products for cell matrices. However, they often dehydrate, and become stiff and brittle in air, causing loss of flexibility and functions. Several layered structures have been proven to increase the strength, toughness, and even flexibility of these materials, which might provide a new clue for the sustenance of the flexibility of drying gels. Herein, we report a novel solvent-dehydrated hydrogel engineering approach, aimed to change the inner structure and keep the flexibility of a dehydrated hydrogel in the air via solvent-induced dehydration, for example, acetonedehydrated polyacrylic acid hydrogel. This flexible dry gel could be folded, twisted, and stretched without any damage due to the assumed lamella-like structures, contrary to dry gels without these microstructures or those with porous structures, which retain brittle consistency. The flexible dry gel also exhibited excellent self-healing capability with the assistance of solvents. Fascinatingly, this flexible gel film displayed strain-visualizing paper writing/ erasing performance properties, with water acting as invisible ink. Thus, this fabricated flexible hydrogel film might function as confidential information storage material. Our current approach is versatile, hence applicable to other hydrogels, and provides insight into the engineering of other functional gels for extended future applications.

中文翻译:

在不良溶剂中通过脱水设计的具有薄片状结构的柔性干水凝胶

水凝胶是最新技术中最有前途的生物材料之一,具有许多所需的应用,包括用作生物传感器,药物运输工具和细胞基质的组织工程化产品。但是,它们经常会脱水,并在空气中变硬变脆,从而导致柔韧性和功能丧失。已经证明了几种分层结构可以提高这些材料的强度,韧性甚至柔韧性,这可能为维持干燥凝胶的柔韧性提供了新的线索。本文中,我们报道了一种新型的溶剂脱水水凝胶工程方法,旨在通过溶剂诱导的脱水来改变脱水水凝胶的内部结构并保持其在空气中的柔韧性,例如丙酮脱水聚丙烯酸酯水凝胶。这种柔软的干凝胶可以折叠,扭曲,与没有这些微结构的干凝胶或具有多孔结构但保留了脆性稠度的干凝胶相反,由于假定的薄片状结构而没有任何损坏。柔性干凝胶在溶剂的辅助下也表现出出色的自愈能力。令人着迷的是,这种柔软的凝胶膜表现出应变可视化的纸张书写/擦除性能,并且水充当了不可见的墨水。因此,这种制造的柔性水凝胶膜可以用作机密信息存储材料。我们当前的方法用途广泛,因此可适用于其他水凝胶,并为扩展未来的应用提供了对其他功能性凝胶工程学的见识。与没有这些微结构的干凝胶或具有多孔结构的干凝胶相反,干凝胶保持脆性。柔性干凝胶在溶剂的辅助下也表现出出色的自愈能力。令人着迷的是,这种柔软的凝胶膜表现出应变可视化的纸张书写/擦除性能,而水充当了不可见的墨水。因此,这种制造的柔性水凝胶膜可以用作机密信息存储材料。我们当前的方法用途广泛,因此可应用于其他水凝胶,并为扩展未来的应用提供了对其他功能性凝胶工程学的见识。与没有这些微结构的干凝胶或具有多孔结构的干凝胶相反,干凝胶保持脆性。柔性干凝胶在溶剂的辅助下也表现出出色的自愈能力。令人着迷的是,这种柔软的凝胶膜表现出应变可视化的纸张书写/擦除性能,而水充当了不可见的墨水。因此,这种制造的柔性水凝胶膜可以用作机密信息存储材料。我们当前的方法用途广泛,因此可应用于其他水凝胶,并为扩展未来的应用提供了对其他功能性凝胶工程学的见识。这种柔软的凝胶膜具有水墨不可见油墨的应变可视化书写/擦除性能。因此,这种制造的柔性水凝胶膜可以用作机密信息存储材料。我们当前的方法用途广泛,因此可应用于其他水凝胶,并为扩展未来的应用提供了对其他功能性凝胶工程学的见识。这种柔软的凝胶膜具有水墨不可见油墨的应变可视化书写/擦除性能。因此,这种制造的柔性水凝胶膜可以用作机密信息存储材料。我们当前的方法用途广泛,因此可适用于其他水凝胶,并为扩展未来的应用提供了对其他功能性凝胶工程学的见识。
更新日期:2020-06-24
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