This spray-on powder can stop life-threatening bleeding in 1 second

The research team, led by Professor Steve Park of KAIST's Department of Materials Science and Engineering and Professor Sangyong Jon of the Department of Biological Sciences, created a powder type hemostatic agent that quickly transforms into a strong hydrogel barrier when sprayed onto a wound.

Because an Army Major directly participated in the project, the technology was designed with real battlefield conditions in mind. The powder hardens almost instantly, remains stable during storage, and can be deployed quickly even in demanding environments such as combat zones and disaster areas.

Powder Designed for Deep and Complex Wounds

Conventional patch type hemostatic products are widely used in medicine, but their flat design makes them difficult to apply to deep, irregular, or complex wounds. They can also be sensitive to temperature and humidity, creating challenges for storage and field use.

To overcome those limitations, the researchers developed a powder that can conform to wounds of many different shapes and sizes. A single product can be used on deep, large, and uneven injuries, making it more versatile than traditional alternatives.

Most existing hemostatic powders work primarily by absorbing blood and creating a physical barrier. Instead, the KAIST team designed their material to take advantage of natural ionic reactions that occur in blood.

How the AGCL Powder Works

The new material, called 'AGCL powder,' combines several naturally derived, biocompatible ingredients. These include Alginate and Gellan Gum (which react with calcium for ultra-fast gelation and physical sealing) along with Chitosan (which bonds with blood components to enhance chemical and biological hemostasis).

When the powder comes into contact with blood, it reacts with cations such as calcium and transforms into a gel in about one second, rapidly sealing the wound.

Its three dimensional internal structure also allows the powder to absorb more than seven times its own weight in blood (725%). This enables it to quickly block blood flow even during heavy, high pressure bleeding. According to the researchers, the material outperformed commercially available hemostatic agents, achieving an adhesive strength greater than '40kPa,' which is strong enough to withstand firm hand pressure.

Strong Safety and Healing Results

AGCL powder is made entirely from naturally derived materials. Laboratory testing showed a hemolysis rate below 3%, cell viability above 99%, and an antibacterial effect of 99.9%, indicating that it is safe when it comes into contact with blood.

Animal studies also demonstrated rapid wound healing, along with improved regeneration of blood vessels and collagen.

In surgical liver injury experiments, the powder reduced both blood loss and the time required to stop bleeding compared with commercial hemostatic products. Liver function returned to normal within two weeks after surgery, and researchers found no evidence of systemic toxicity.

Another important advantage is durability. The powder maintained its performance for two years under room temperature and high humidity conditions, allowing it to remain ready for immediate use in harsh military or disaster environments.

Potential Beyond the Battlefield

Although the technology was originally developed for national defense, the researchers believe it could have wide ranging applications in emergency medicine. Possible uses include disaster response, healthcare in developing countries, and treatment in medically underserved regions.

The project is considered a representative spin-off case in which defense research has been adapted for civilian use. In addition to emergency battlefield treatment, the technology may also be useful for controlling bleeding during internal surgery. (A spin-off case means expanding or transferring national defense science and technology for use in the private sector. Examples include computers, GPS, microwave ovens, etc.)

The research received recognition for both its scientific innovation and defense value, earning the 2025 KAIST Q-Day President's Award as well as the Minister of National Defense Award at the 2024 KAIST-KNDU National Defense Academic Conference.

Ph.D candidate Kyusoon Park (Army Major), who participated in the research, stated, "The core of modern warfare is minimizing the loss of human life," and added, "I started the research with a sense of mission to save even one more soldier." He continued, "I hope this technology will be used as a life-saving technology in both national defense and private medical fields."

The study was led by KAIST PhD student Kyusoon Park and Ph.D candidate Youngju Son under the guidance of Professor Steve Park and Professor Sangyong Jon. It was published online on October 28, 2025, in the international journal Advanced Functional Materials (IF 19.0), which specializes in chemistry and materials engineering.

The research was supported by the National Research Foundation of Korea (NRF).