Senegalese Scientist Sidy Ndao Develops world's first high-temperature thermal diode

HARARE — Senegalese-born scientist Sidy Ndao is pushing the boundaries of computing after developing a technology that could allow machines to process information using heat rather than electricity, opening new possibilities for computing in some of the harshest environments known to science.

Ndao, a mechanical and materials engineering researcher at the University of Nebraska-Lincoln (UNL), and his research team developed a nano-thermal-mechanical device known as a thermal diode, designed to control the movement of heat at the micro- and nanoscale.

The innovation turns one of computing's traditional enemies, heat ,into a potential source of energy for processing and storing information.

According to UNL, the researchers developed what the university describes as the world's first high-temperature thermal diode, demonstrating thermal rectification using near-field thermal radiation and advanced materials. The technology forms the basis of what Ndao calls NanoThermoMechanical thermal computing.

Unlike conventional computers, which depend on electrical currents and semiconductor components, NanoThermoMechanical devices are designed to use heat to record, store and process data. Ndao's research has also explored thermal logic gates, creating building blocks that could eventually allow computers to perform calculations using heat.

The breakthrough could have important implications for space exploration and other environments where conventional electronics struggle to operate. Ndao's research has specifically considered extreme conditions such as Venus, where temperatures are hot enough to severely challenge conventional electronic systems.

UNL reported that an early version of the thermal diode operated at temperatures approaching 630 degrees Fahrenheit (about 332°C), while Ndao indicated that future versions could potentially operate at temperatures approaching 1,300 degrees Fahrenheit (about 704°C).

Such capabilities could enable computers and sensors to function in environments including planetary exploration, deep geological research and high-temperature industrial operations, where cooling conventional electronics can be difficult or impossible.

The technology could also have implications for energy efficiency. Rather than treating waste heat solely as something that must be removed, thermal computing could potentially harness some of that energy for useful computational work.

From Dakar to the global scientific stage

Born in Dakar, Senegal, Ndao developed an interest in science and engineering from an early age. He later moved to the United States, graduating as valedictorian of his high-school class in 2001 before studying mechanical engineering at City College of New York.

He earned a doctorate in mechanical engineering from Rensselaer Polytechnic Institute in 2010 and subsequently conducted postdoctoral research at the Massachusetts Institute of Technology, where his work included MEMS thermoelectric and thermophotovoltaic power generation and high-temperature photonic crystals.

His scientific work has earned international recognition. Ndao was selected as a Next Einstein Forum Fellow, an initiative that identifies leading African scientists working in fields with the potential to transform the continent and the wider world. His research area was identified as micro- and nanoscale thermal/fluid sciences.

Beyond his laboratory work, Ndao has also invested in nurturing Africa's next generation of scientists and innovators. He founded SenEcole, an organisation focused on promoting STEM education for sustainable development in Africa, and has supported robotics programmes and competitions for young people in Senegal and across the continent.

His research portfolio extends beyond thermal computing to areas including nanoscale heat transfer, thermal-fluid sciences, thermophotovoltaics, MEMS technologies and advanced surface engineering.

His laboratory has also investigated thermal memory and logic systems, including devices capable of performing computational functions through controlled heat transfer.

Additional reporting:The African Folder.