In a groundbreaking discovery that challenges our understanding of everyday materials, researchers at Penn State have revealed that ordinary adhesive tape possesses a remarkable ability to store a sequence of mechanical memories. This new class of material memory defies conventional wisdom and opens up exciting possibilities for future applications in mechanical computation and resilient material design. Unlike previously known memory effects that require alternating inputs, adhesive tape demonstrates a unique capacity to record multiple memories through unidirectional manipulation, which can be fine-tuned or erased at will.
The concept of material memory is not new; it describes the ability of physical systems to remember past deformations or inputs, thereby influencing their current behavior. Familiar examples include creases in paper, which persist after folding, and combination locks, which rely on a sequence of rotational positions to function. These systems typically exhibit what scientists call return-point memory, where the sequence of inputs alternates direction, allowing the system to return to exact previous states. For instance, turning a lock’s dial clockwise then counterclockwise enables it to encode combinations accurately.
However, adhesive tape’s memory departs from this well-known return-point paradigm. Nathan Keim, associate professor of physics and lead investigator of the study, explains that unlike combination locks, tape can store sequences of mechanical events without the need for reversing input directions. This ability to accumulate memories strictly through peeling the tape in one direction—and modifying the extent of peeling—represents a novel form of mechanical memory that had not been documented before.
The innovative research employed a custom-built automated apparatus that gently peels a strip of adhesive tape from a surface to predetermined distances before reapplying it. The process exploits the tape’s pressure-sensitive adhesive properties: exerting more pressure strengthens adhesion, while partial peeling alters the local adhesive characteristics. Each time the tape is peeled back partway and pressed down again, a distinct “line” of stronger adhesion forms at the stopping point. These lines serve as physical records of each peeling event, effectively encoding a mechanical history.
To quantify these memories, the team measured the force required to peel the tape. Each previously formed line causes a measurable spike in peel force when it is crossed during subsequent peeling. In this way, the tape’s peeling force profile functions as a readout of the stored mechanical memories. Remarkably, peeling the tape past one of these adhesion lines can erase that particular memory, resetting the tape’s state and preparing it for new memory storage cycles.
Aside from merely demonstrating the storage and retrieval of multiple memories, the researchers also showed that the strength of each memory can be modulated. By adjusting how long the tape is held in a partially peeled state before being reapplied, they can control the adhesive line’s robustness. This tunability allows the mechanical memory to represent different levels of encoded information, much like varying signal strengths in electronic memory systems.
One of the most intriguing findings is the tape’s last-in-first-out (LIFO) memory behavior. The newest memory imprinted by peeling becomes the first one encountered and read when peeling again. This feature underpins a simple mechanical logic analogous to a one-back comparison test used in neuroscience to assess working memory. In this test, subjects compare a current stimulus with the immediately preceding one, mirroring the tape’s ability to mechanically compare successive memories.
This novel understanding of tape’s memory mechanism transcends the simplistic view of adhesive products as merely sticky surfaces. It introduces the possibility that common materials can perform elementary mechanical computations without the need for electrical power, providing a potential avenue for developing robust, energy-efficient mechanical memory devices. While the researchers do not predict that adhesive tape itself will become a foundation for such devices, their work lays the groundwork for exploring new classes of functional materials with embedded mechanical memory.
The implications of this discovery ripple across multiple scientific domains. In materials science, it sheds light on the fundamental mechanics of soft adhesive interfaces and their nonlinear response to deformation. In physics, it offers a fresh perspective on memory formation and retrieval within nonequilibrium systems. Additionally, in engineering and technology, this newfound capability could inspire the design of smart materials with tailored adhesion and memory properties for applications ranging from structural health monitoring to user-friendly mechanical interfaces.
The research team consisted of Nathan Keim, lead investigator from Penn State’s Eberly College of Science; Sebanti Chattopadhyay, a postdoctoral scholar and first author; and Carys Chase-Mayoral, an undergraduate researcher from Dickinson College who contributed significantly during her summer work and earned recognition for her presentation. Funding was provided by the Human Frontier Science Program, and additional support for Chase-Mayoral came from the US National Science Foundation.
Published recently in the New Journal of Physics, this study represents a significant stride toward decoding how seemingly mundane materials like adhesive tape can harbor complex memory mechanisms. It challenges researchers to rethink current paradigms of memory beyond electronics and biology, hinting at a future where mechanical and material sciences converge to uncover novel computational strategies encoded in everyday substances.
As research into mechanical memories in soft matter progresses, the scientific community anticipates new insights that may redefine both fundamental physics and applied materials engineering. From intelligent adhesives that adapt their properties dynamically to mechanical logic gates devoid of electricity, the intersection of adhesion and memory promises an exciting frontier in the quest for sustainable and resilient technologies.
Subject of Research: Not applicable
Article Title: The mechanical latching memory of an adhesive tape
News Publication Date: 9-Mar-2026
Web References: New Journal of Physics DOI: 10.1088/1367-2630/ae4acc
References: New Journal of Physics, DOI 10.1088/1367-2630/ae4acc
Image Credits: Jaydyn Isiminger, Penn State
Keywords
Physical sciences, Physics, Condensed matter physics, Soft matter physics, Materials science, Material properties, Adhesives, Shape memory, Memory formation, Working memory
