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We establish the existence and size of adsorbed polymer layers in miscible dense nanocomposites and their consequences on microstructure and the bulk modulus. Using contrast matching small angle neutron scattering to characterize all partial collective structure factors of polymers, particles and their interface, we demonstrate qualitative failure of the random phase approximation, accuracy of the polymer reference site interaction model theory, ability to deduce the adsorbed polymer layerdoi:10.1103/physrevlett.107.225504 pmid:22182034 fatcat:nqzn6cgr5na4lmpo5l2pd7mwea