title: Nanoconfinement Inside Molecular Metal Oxide Clusters: Dynamics and Modified Encapsulation Behavior.
abstract: Encapsulation behavior, as well as the presence of internal catalytically active sites, has been spurring the applications of a 3 nm hollow spherical metal oxide cluster {Mo132 } as an encapsulation host and a nanoreactor. Due to its well-defined and tunable cluster structures, and nanoscaled internal void space comparable to the volumes of small molecules, this cluster provides a good model to study the dynamics of materials under nanoconfinement. Neutron scattering studies suggest that bulky internal ligands inside the cluster show slower and limited dynamics compared to their counterparts in the bulk state, revealing the rigid nature of the skeleton of the internal ligands. NMR studies indicate that the rigid internal ligands that partially cover the interfacial pore on the molybdenum oxide shells are able to block some large guest molecules from going inside the capsule cluster, which provides a convincing protocol for size-selective encapsulation and separation.
authors.affiliation: Shull Wollan Center, Neutron Sciences Directorate Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831, USA.|Biology and Soft Matter Division, Neutron Sciences Directorate Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831, USA.
authors.forename: Zhe
authors.identifier: http://orcid.org/0000-0003-4103-0751
authors.initials: Z
authors.lastname: Wang
authors.affiliation: Chemical and Engineering Materials Division, Neutron Sciences Directorate Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831, USA.
authors.forename: Luke L
authors.identifier: http://orcid.org/0000-0003-4103-0751
authors.initials: LL
authors.lastname: Daemen
authors.affiliation: Chemical and Engineering Materials Division, Neutron Sciences Directorate Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831, USA.
authors.forename: Yongqiang
authors.identifier: http://orcid.org/0000-0002-3263-4812
authors.initials: Y
authors.lastname: Cheng
authors.affiliation: Chemical and Engineering Materials Division, Neutron Sciences Directorate Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831, USA.
authors.forename: Eugene
authors.identifier: http://orcid.org/0000-0002-5684-2675
authors.initials: E
authors.lastname: Mamontov
authors.affiliation: Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831, USA.
authors.forename: Peter V
authors.identifier: http://orcid.org/0000-0002-1397-8281
authors.initials: PV
authors.lastname: Bonnesen
authors.affiliation: Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831, USA.
authors.forename: Kunlun
authors.identifier: http://orcid.org/0000-0002-2852-5111
authors.initials: K
authors.lastname: Hong
authors.affiliation: Chemical and Engineering Materials Division, Neutron Sciences Directorate Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831, USA.
authors.forename: Anibal J
authors.identifier: http://orcid.org/0000-0003-1231-0068
authors.initials: AJ
authors.lastname: Ramirez-Cuesta
authors.affiliation: Shull Wollan Center, Neutron Sciences Directorate Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831, USA. yinp@ornl.gov.|Chemical and Engineering Materials Division, Neutron Sciences Directorate Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831, USA. yinp@ornl.gov.
authors.forename: Panchao
authors.identifier: http://orcid.org/0000-0003-2902-8376
authors.initials: P
authors.lastname: Yin
keywords: confinement; dynamics; encapsulation; neutron scattering; polyoxometaltes