What is the fine-grained topic of the following text: Researchers working within PNNL’s Separations Science program succeeded in coupling a highly controlled way of modifying surfaces, called ion soft landing, with a PNNL-designed and built electrochemical cell to achieve precise control over the chemical composition of complex interfaces. Only return the topic.
Coupling Ion Soft Landing with Electrochemical Cell for Precise Control over Chemical Composition of Complex Interfaces