Researchers at the University of Liverpool have developed AI-driven mobile robots that can efficiently conduct chemical synthesis research. 

In a study published in Nature, researchers show how mobile robots that use AI logic to make decisions could perform exploratory chemistry research tasks to the same level as humans but much faster. 

The Liverpool team designed the 1.75-meter-tall mobile robots to tackle three primary problems in exploratory chemistry: performing the reactions, analysing the products, and deciding what to do next based on the data. 

The two robots performed these tasks cooperatively as they addressed problems in three different areas of chemical synthesis: structural diversification chemistry (relevant to drug discovery), supramolecular host-guest chemistry, and photochemical synthesis. 

AI Robots Match Human Chemists in Decision-Making 

The results found that with the AI function, the mobile robots made the same or similar decisions as human researchers, but these decisions were made on a far quicker timescale than a human, which could take hours. 

Professor Andrew Cooper from the University of Liverpool’s Department of Chemistry and Materials Innovation Factory, who led the project, explained: 

“Chemical synthesis research is time-consuming and expensive, both in the physical experiments and the decisions about what experiments to do next, so using intelligent robots provides a way to accelerate this process. 

“When people think about robots and chemistry automation, they tend to think about mixing solutions, heating reactions, etc. That’s part of it, but the decision-making can be at least as time-consuming. This is particularly true for exploratory chemistry, where you’re unsure of the outcome. It involves subtle, contextual decisions about whether something is interesting or not based on multiple datasets. It’s a time-consuming task for research chemists but a tough problem for AI.” 

Decision-making is a critical problem in exploratory chemistry. For example, a researcher might run several trial reactions and then decide to scale up only the ones that give good reaction yields or interesting products. This is hard for AI to do as the question of whether something is ‘interesting’ and worth pursuing can have multiple contexts, such as the novelty of the reaction product or the cost and complexity of the synthetic route. 

Instant Chemical Insights 

Dr Sriram Vijayakrishnan, a former University of Liverpool PhD student and the Postdoctoral Researcher with the Department of Chemistry who led the synthesis work explained: “When I did my PhD, I did many of the chemical reactions by hand. Often, collecting and figuring out the analytical data took just as long as setting up the experiments. This data analysis problem becomes even more severe when you start to automate the chemistry. You can end up drowning in data.” 

“We tackled this here by building an AI logic for the robots. This processes analytical datasets to make an autonomous decision -- for example, whether to proceed to the next step in the reaction. This decision is basically instantaneous, so if the robot does the analysis at 3:00 am, then it will have decided by 3:01 am which reactions to progress. By contrast, it might take a chemist hours to go through the same datasets.” 

Professor Cooper added: “The robots have less contextual breadth than a trained researcher, so it won’t have a “Eureka!” moment in its current form. But for the tasks that we gave it here, the AI logic made more or less the same decisions as a synthetic chemist across these three different chemistry problems, and it makes these decisions in the blink of an eye. There is also huge scope to expand the contextual understanding of the AI, for example, by using large language models to link it directly to relevant scientific literature.” 

The research team stated that they hope to use this technology to discover chemical reactions relevant to pharmaceutical drug synthesis and new materials for applications such as carbon dioxide capture in the future. 

“Two mobile robots were used in this study, but there is no limit to the size of the robot teams that could be used. Hence, this approach could scale to the largest industrial laboratories,” the team added.  

Science daily