ALBERT

Description: The prediction and synthesis of new crystal structures enable the targeted preparation of materials with desired properties. Among porous solids, this has been achieved for metal-organic frameworks, but not for the more widely applicable zeolites, where new materials are usually discovered using exploratory synthesis. Although millions of hypothetical zeolite structures have been proposed, not enough is known about their synthesis mechanism to allow any given structure to be prepared. Here we present an approach that combines structure solution with structure prediction, and inspires the targeted synthesis of new super-complex zeolites. We used electron diffraction to identify a family of related structures and to discover the structural 'coding' within them. This allowed us to determine the complex, and previously unknown, structure of zeolite ZSM-25 (ref. 8), which has the largest unit-cell volume of all known zeolites (91,554 cubic angstroms) and demonstrates selective CO2 adsorption. By extending our method, we were able to predict other members of a family of increasingly complex, but structurally related, zeolites and to synthesize two more-complex zeolites in the family, PST-20 and PST-25, with much larger cell volumes (166,988 and 275,178 cubic angstroms, respectively) and similar selective adsorption properties. Members of this family have the same symmetry, but an expanding unit cell, and are related by hitherto unrecognized structural principles; we call these family members embedded isoreticular zeolite structures.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Guo, Peng -- Shin, Jiho -- Greenaway, Alex G -- Min, Jung Gi -- Su, Jie -- Choi, Hyun June -- Liu, Leifeng -- Cox, Paul A -- Hong, Suk Bong -- Wright, Paul A -- Zou, Xiaodong -- England -- Nature. 2015 Aug 6;524(7563):74-8. doi: 10.1038/nature14575. Epub 2015 Jul 15.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉1] Inorganic and Structural Chemistry, Department of Materials and Environmental Chemistry, Stockholm University, SE-106 91 Stockholm, Sweden [2] Berzelii Centre EXSELENT on Porous Materials, Stockholm University, SE-106 91 Stockholm, Sweden. ; Centre for Ordered Nanoporous Materials Synthesis, School of Environmental Science and Engineering, POSTECH, Pohang 790-784, South Korea. ; EaStCHEM School of Chemistry, University of St Andrews, St Andrews, KY16 9ST, UK. ; School of Pharmacy and Biomedical Sciences, University of Portsmouth, Portsmouth PO1 2DT, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26176918" target="_blank"〉PubMed〈/a〉

Description: Author(s): M. T. Greenaway, A. G. Balanov, and T. M. Fromhold We show theoretically that the dynamics of cold atoms in the lowest-energy band of a stationary optical lattice can be transformed and controlled by a second, weaker, periodic potential moving at a constant speed along the axis of the stationary lattice. The atom trajectories exhibit complex behavio... [Phys. Rev. A 87, 013411] Published Tue Jan 15, 2013

Description: Author(s): N. Alexeeva, M. T. Greenaway, A. G. Balanov, O. Makarovsky, A. Patanè, M. B. Gaifullin, F. Kusmartsev, and T. M. Fromhold We demonstrate, through experiment and theory, enhanced high-frequency current oscillations due to magnetically-induced conduction resonances in superlattices. Strong increase in the ac power originates from complex single-electron dynamics, characterized by abrupt resonant transitions between unbou... [Phys. Rev. Lett. 109, 024102] Published Wed Jul 11, 2012