A research group at Centenary College of Louisiana (USA) has developed a prototype of electrically conductive nail polish, making it easier for users to operate on touch screens.
The project is led by chemistry student Manasi Desai, under the guidance of lecturer Joshua Lawrence.
The idea originated from a familiar problem when many people have difficulty using smartphones or tablets. People with long fingernails, rough fingertips or wearing gloves often cannot operate accurately on touch screens.
To solve this, the research team has created a transparent nail polish that can turn the nail into an electrically conductive touch point, similar to the fingertip.
The nail polish can be applied to natural nails or on colored polish, both ensuring aesthetics and increasing convenience.
According to Desai, the product is not only aimed at beauty but also improves the technology experience in daily life.
In particular, manual workers such as carpenters, instrumentalists or medical staff, who are prone to calluses, can benefit significantly.
Regarding the operating mechanism, modern touch screens operate based on the principle of capacitance. When an electrical conductor such as a finger touches the screen, it will change the electric field, thereby being recognized by the device as a touch operation. However, fingernails are not capable of conducting electricity, so they cannot interact directly.
Previous studies have tried to add conductive materials such as metal or carbon nanotubes to nail polish, but often encountered safety and aesthetic problems.
Desai's group chose a different approach, which is to find a safe, transparent formula that still ensures electrical conductivity.
After testing 13 types of paints and more than 50 additives, the group identified the combination of taurine (an amino acid) and ethanolamine (organic compound) as the most potential solution.
This formula helps the paint layer to be both user-friendly and maintain the ability to interact with the screen.
Although the initial results are quite positive, the product is still in the testing phase. One of the biggest limitations is durability when the conductivity is only maintained for a few hours to a few days, while the goal is to last for weeks.
In addition, aesthetics also need to be improved. Some paint versions have surfaces that are not smooth or have stains, which can affect the user experience.
The research team has applied for a temporary patent, showing the commercial potential of the product in the future.
If completed, this nail polish can become a simple but effective solution, helping touch screen technology become more user-friendly for all user groups.
