Research support demonstrates the value of academic libraries and librarians. Recent studies have revealed that research support has been evolving from traditional citation analysis to advanced library services such as research field trend/frontiers analysis and talent evaluation. Using a powerful bibliometric tool CiteSpace and "active matter" as an example, co-citation network analysis illustrates how to identify research trends, active research areas, and intellectual turning point publications. Unique features in CiteSpace are discussed, which were absent from case studies of other major science mapping/bibliometric tools used by librarians. Science and engineering librarians should be able to apply this technique to other research fields.