Chitin Nanocrystals as an Eco-friendly and Strong Anisotropic Adhesive

Abstract

To solve the damage to the environment and human body caused by organic solvent adhesives in the utilization process, chitin nanocrystal (ChNC) suspension is explored as a strong anisotropic adhesive, which is an eco-friendly and water-based adhesive with high adhesive strength. ChNCs extracted from crab shells are rod-like nanoparticles with high aspect ratios, which are mainly employed as reinforcing polymer nanocomposites and biomedicine nanomaterials. ChNC suspension sandwiched between substrates forms a long-range ordered superstructure by a self-assembly process. ChNC nanoglue exhibits high anisotropy adhesion strength, i.e., an in-plane shear strength (5.26 MPa) and an out-of-plane shear strength (0.46 MPa) for glass substrates. Moreover, the ChNC nanoglue is suitable to many substrates, such as glass, plastic, wood, metal, paper, etc. The ChNC nanoglue shows high biocompatibility toward the fibroblast cell and rat skin, proving their excellent biosafety. As an eco-friendly and high-performance adhesive, ChNC nanoglue shows promising applications in daily life and industrial fields.

Nanochitin: Chemistry, Structure, Assembly, and Applications

“…380,381 They are mainly responsible for the formation of assemblies upon drying, which are held together in such a way that the interactions surpass the interfacial potential between particles and the substrate, resulting in the assembly of macroscopic materials. 382 In the framework of the Laplace−Young equation, the capillary force can be enhanced by increasing wettability or confinement. 383 Taking advantage of the capillary force in a confined area, evaporation-induced selfassembly (EISA) of ChNCs was achieved, generating strong ChNC superstructures with long-range ordering (Figure 23a1).…”

Gold@Halloysite nanotubes-chitin composite hydrogel with antibacterial and hemostatic activity for wound healing

“…As a wound hemostasis and healing dressing, the biosafety of Au@HNTs-chitin is crucial. Based on previous studies on skin safety, the mouse fibroblast cell line L929 were selected as an in vitro model [ 40 , 41 ]. The cytotoxicity was assessed by exposing L929 mouse fibroblasts in PBS (control group) and different concentrations of Au@HNTs-chitin leaching solution for 24 and 48 h. After treatment, cell viability was detected using Cell Counting Kit-8 (CCK-8) method.…”

Strong, Multifaceted Guanidinium-Based Adhesion of Bioorganic Nanoparticles to Wet Biological Tissue

“…As nanomaterials, they were used as reinforcing fillers for polymeric adhesives without directly exhibiting adhesive properties (Figure S1a). , The use of chitin nanoparticles as adhesives for dry, hard surfaces through long-range, self-assembled structure has also been reported . However, in this system water evaporation is required to induce the self-assembly of chitin nanoparticles, and the adhesion is completely lost upon rehydration, thus not applicable to wet, dynamic surfaces like biological tissue (Figure S1b).…”