Researchers achieve higher precision with biocompatible hydrogel photoresist

Hydrogel materials are widely used due to their excellent biocompatibility. However, the micro- and nanofabrication biomaterials, such as small-diameter artificial blood vessels, flexible biomaterial microdevices, minimally invasive tissue adhesives, and organ and tissue engineering stents, still face the challenge of higher precision.

Prof. Zheng Meiling's team from the Technical Institute of Physics and Chemistry of the Chinese Academy of Sciences (CAS) developed a biocompatible hydrogel photoresist. In the new strategy, hyaluronic acid vinyl ester (HAVE) is the monomer, cyclopentanone-based material is initiator, and DL-Dithiothreitol is the thiol-ene click chemical cross-linker.

The proposed two-photon polymerization (TPP) of HAVE photoresist strategy leads to a 22 nm resolution. This work was published in ACS Applied Materials & Interfaces on May 23.

In this study, the researchers extensively investigated the TPP of HAVE hydrogel photoresists, and achieved the 22 nm feature size. The photoresist formulation was optimized and the biocompatibility of 3D hydrogel cell scaffolds was explored. The influence of the focus position on the laser threshold was also comprehensively investigated.

Furthermore, the biocompatible 3D hydrogel scaffold structures were fabricated. The protocol proposed in this study is promising for fabricating complex biocompatible 3D hydrogel structures and exploring the potential applications in microenvironment regulation, tissue engineering, biomedicine, and biomimetic science.