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Scheme detailing the preparation of enantiomeric gold nanoparticle double helices. C12-d-PEPAu and C12-l-PEPAu, when mixed with a gold precursor solution and HEPES buffer, direct the formation of, respectively, right- and left-handed double helices. Each double helix has quantifiable metrics, including nanoparticle size, interparticle distance, pitch, and interhelical distance.
