智能水凝胶材料,以对外界刺激的敏感性而闻名,表现出可逆的动态响应,并在不同领域找到应用,特别是在信息存储方面。尽管在这个领域做出了巨大的努力,开发高分辨率的水凝胶,可重复记录,和强大的信息加密/解密功能仍然是一个挑战。在这项研究中,我们合成了一种聚合物水凝胶,即聚乙烯醇-正异丙基丙烯酰胺-十八烷基聚氧乙烯醚丙烯酸酯水凝胶(PPNS),通过共聚形成多个氢键,通过使用N-异丙基丙烯酰胺,聚乙烯醇,和十八烷基聚氧乙烯醚丙烯酸酯(SGA15)为原料。PPNS水凝胶表现出出色的高分辨率,可重复记录功能,实现可逆记录,加密,以无水乙醇为诱导剂解密信息。改变SGA15单体浓度显示PPNS-2%水凝胶,当浸入无水乙醇和去离子水中时,用2%SGA15制备的水凝胶在信息记录和加密/解密方面优于其他水凝胶。此外,PPNS-2%水凝胶表现出经历多个信息循环的能力,同时即使在25个循环后仍保持优异的机械性能。值得注意的是,乙醇用作专门的墨水,用于在水凝胶表面刻写不同的图案以进行信息记录。记录的信息可以通过水擦拭或乙醇挥发来擦除,实现可逆信息记录,加密,和解密。由于PPNS水凝胶的响应性和动态特性,因此将其定位为有希望的候选物,可用作创新的信息存储平台。
Smart hydrogel materials, known for their sensitivity to external stimuli, exhibit a reversible dynamic response and find applications in diverse fields, particularly in information storage. Despite significant efforts in this domain, developing a hydrogel with high-resolution, repeatable recording, and robust information encryption/decryption capabilities still remains a challenge. In this study, we synthesized a polymer hydrogel, namely polyvinyl alcohol-n-isopropylacrylamide-octadecyl polyoxyethylene ether acrylate hydrogel (PPNS), which features multiple hydrogen bonds through copolymerization, by using N-isopropylacrylamide, polyvinyl alcohol, and octadecyl polyoxyethylene ether acrylate (SGA15) as raw materials. The PPNS hydrogel demonstrated outstanding high-resolution, repeatable recording capabilities, enabling reversible recording, encryption, and decryption of information using anhydrous ethanol as the inducer. Varying the SGA15 monomer concentration revealed that the PPNS-2% hydrogel, prepared with 2% SGA15, outperformed the other hydrogels in terms of information recording and encryption/decryption when immersed in anhydrous ethanol and deionized water. Furthermore, the PPNS-2% hydrogel exhibited the ability to undergo multiple information cycles while maintaining excellent mechanical properties even after 25 cycles. Notably, ethanol served as a specialized ink for inscribing different patterns on the hydrogel surface for information recording. The recorded information could be erased through water wiping or ethanol volatilization, enabling reversible information recording, encryption, and decryption. Due to their responsive and dynamic nature of PPNS hydrogels are positions them as promising candidates for use as innovative information storage platforms.