REDOR determination of amphiphilic and hydrophobic guest locations in amphiphilic nanoparticles
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Water-soluble, amphiphilic polymer nanospheres are synthesized with a hydrophobic polystyrene core and a cross-linked poly(acrylic acid)-polyacrylamide shell. Each core polymer chain is covalently attached to the cross-linked web-like shell. The hydrophilic functionality of the surface can be modified to attract either cations or anions. The entire unit is called a shell cross-linked Knedal (SCK). The use of 13C{13F} and 15N{19F} rotational-echo double resonance to locate amphiphilic 6-fluorotryptophan and hydrophobic 4-trifluoromethyl benzophenon, each of which had been sequestered from a water solution by an 15N-labeled SCK are presented.