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dc.contributor.authorLiu, Hongweien_US
dc.contributor.authorZheng, Zhanfengen_US
dc.contributor.authorYang, Dongjiangen_US
dc.contributor.authorKe, Xuebinen_US
dc.contributor.authorJaatinen, Esaen_US
dc.contributor.authorZhao, Jin-Caien_US
dc.contributor.authorZhu, Huai Yongen_US
dc.description.abstractNumerous materials are polycrystalline or consist with crystals of different phases. However, materials consisting of crystals on the nanometer scale (nanocrystals) are not simply aggregates of randomly oriented crystals as is generally regarded. We found, that in four different materials that consist of nanocrystals of two different phases and were obtained by different approaches, the nanocrystals of different phases are combined coherently forming interfaces with a close crystallographic registry between adjacent crystals (coherent interfaces). The four materials were fabricated by (i) depositing Ag2O nanoparticles on titanate nanofibers, (ii) phase transition from TiO2(B) nanofibers to the nanofibers of mixed TiO2(B) and anatase phases, (iii) dehydration of the single crystal fibril titanate core coated with anatase nanocrystals, and (iv) attaching zeolite Y nanocrystals on the surface of titanate nanofibers. The finding suggests that preferred orientations and coherent interfaces generally exist in nanocrystal systems, and according to our results, they are largely unaffected by the fabrication process that was used. This is because the preferred orientations require that the engaged crystal planes from two connected crystals have the same basal spacing and that the crystals can interlock tightly at the atomic level to form thermodynamically stable interfaces. Hence it is rational that the preferred orientations and coherent interfaces dominant the nanostructures formed between the different nanocrystals and play a key role in assembling the composite nanostructures. The orientation and interfaces between crystals of different phases in mixed-phase materials are extremely difficult to determine. Nonetheless, the thermodynamic stability of the coherent interfaces allows us to apply phase-transformation invariant line strain theory to predict the preferred orientation (and thus the structure of the coherent interfaces). The theoretical predications agree remarkably with the transmission electron microscopy (TEM) analysis. This implies that we may acquire knowledge of the orientation and the interface structures in the mixed-phase materials without TEM measurement, and the knowledge is essential for comprehensively understanding properties of the many materials and processes that depend on the interfaces.en_US
dc.publisherAmerican Chemical Societyen_US
dc.publisher.placeUnited Statesen_US
dc.relation.ispartofjournalACS Nanoen_US
dc.subject.fieldofresearchMaterials Engineering not elsewhere classifieden_US
dc.titleCoherent Interfaces between Crystals in Nanocrystal Compositesen_US
dc.typeJournal articleen_US
dc.type.descriptionC1 - Peer Reviewed (HERDC)en_US
dc.type.codeC - Journal Articlesen_US
gro.rights.copyrightSelf-archiving of the author-manuscript version is not yet supported by this journal. Please refer to the journal link for access to the definitive, published version or contact the author[s] for more information.en_AU
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