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science advances
Lawrence Livermore National Laboratory researcher Cheng Zhu and former Lab postdoc Wen Chen created inks made of gold and silver microparticles. After printing, the 3D parts were heated to allow the particles to coalesce into a gold-silver alloy. The parts were put into a chemical bath that removed the silver (a process called “dealloying”) to form porous gold within each beam or filament. Credit: Ryan Chen/LLNL