Getting glue to adhere in dry conditions is simple. However, maintaining a bond underwater is challenging. Fortunately, there’s a new bio-based glue that not only works underwater but also becomes stronger when submerged.
In a recent study published in ACS Applied Materials & Interfaces, researchers introduced a novel adhesive formula crafted from sustainable, bio-based materials.
Eco-Friendly Innovation: A Plant-Based Adhesive
Purdue University‘s research team led the creation of this proprietary adhesive blend, primarily composed of zein, a corn-derived protein, and tannic acid sourced from oak tree bark galls.
To evaluate its effectiveness, they tested it on various surfaces and exposed it to different water types, including seawater, saline solution, tap water, and deionized water.
When this adhesive is sandwiched between two objects and submerged underwater, it initially forms a delicate skin that can be pierced easily. Once pierced, surrounding water infiltrates the glue, enhancing its bond strength. The optimal bonding occurs at a water temperature of around 30 ºC (86 ºF).
The adhesive developed by the research team is unique because it’s made from affordable, eco-friendly plant-based materials. It can be easily produced in various settings, including outdoors. This non-toxic adhesive has potential applications in construction, manufacturing, and healthcare. It may also aid in coral reef restoration efforts by attaching young coral to underwater structures.
