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                <term xml:lang="en">Single-crystalline</term>
                <term xml:lang="en">Anisotropy</term>
                <term xml:lang="en">Crystalline materials</term>
                <term xml:lang="en">Gold</term>
                <term xml:lang="en">Interfaces (materials)</term>
                <term xml:lang="en">Nanocrystals</term>
                <term xml:lang="en">Self assembly</term>
                <term xml:lang="en">Transmission electron microscopy</term>
                <term xml:lang="en">Superlattices</term>
                <term xml:lang="en">Transmission electron</term>
                <term xml:lang="en">Size segregation</term>
                <term xml:lang="en">X ray diffraction</term>
                <term xml:lang="en">Single nanocrystals</term>
                <term xml:lang="en">Self-assembling</term>
                <term xml:lang="en">Self-assemble</term>
                <term xml:lang="en">Preferential orientation</term>
                <term xml:lang="en">Potential applications</term>
                <term xml:lang="en">Polycrystalline</term>
                <term xml:lang="en">Orientational orderings</term>
                <term xml:lang="en">Nanocrystallinity</term>
                <term xml:lang="en">Low-frequency Raman scattering</term>
                <term xml:lang="en">Gold nanocrystals</term>
                <term xml:lang="en">facets</term>
                <term xml:lang="en">Crystallinities</term>
                <term xml:lang="en">Colloidal solutions</term>
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              <p>Spontaneous separation of single from polycrystalline 5 nm gold nanocrystals (NCs) is observed in colloidal solution. This segregation takes place upon self-assembling of single crystalline NCs at the air-solvent interface and in precipitated superlattices. Polycrystalline NCs are observed to remain in the suspension. Transmission electron microscopy analysis of the size distribution of NCs issued from the different populations indicates that the NC size does not change from each other, excluding therefore any size segregation in this process. Using both low-frequency Raman scattering and X-ray diffraction provides reliable characterization of nanocrystallinity for each population of NCs, thus confirming the crystallinity segregation. The single crystalline NCs are found by electron diffraction to self-assemble into close-packed superlattices with long-range translational and orientational ordering, while polycrystalline NCs behave like spheres with no preferential orientation. The face-to-face orientational ordering, which is only observed for single crystalline NCs, supports the relevance of the specific crystallinity-related morphologies of these NCs in their better ability to self-assemble. Exploiting this spontaneous segregation would open up a simple alternative to other demanding routes for controlling crystallinity of nanocrystals and optimizing their properties for potential applications.</p>
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