Research Highlights 2015 - Universität Bremen

MAPEX Research Highlights| 30.11.2015

Unraveling the Dynamic Nanoscale Reducibility (Ce4+ → Ce3+) of CeOx–Ru in Hydrogen Activation

Jan Höcker, Tevfik Onur Mentes, Alessandro Sala, Andrea Locatelli, Thomas Schmidt, Jens Falta, Sanjaya D. Senanayake and Jan Ingo Flege.

Advanced Materials Interfaces (2015) 2, 1500314.

doi:10.1002/admi.201500314

The interaction of molecular hydrogen with ceria is of important relevance for…

MAPEX Research Highlights| 23.10.2015

Tetrahedral Tetraphosphonic Acids. New Building Blocks in Supramolecular Chemistry

Alexandra Schütrumpf, Erdoğan Kirpi, Aysun Bulut, Flavien L. Morel, Marco Ranocchiari, Enno Lork, Yunus Zorlu, Simon Grabowsky, Gündoğ Yücesan, and Jens Beckmann.

ACS Crystal Growth and Design (2015) 15, 4925-4931.

doi:10.1021/acs.cgd.5b00811

The structural characterization of…

MAPEX Research Highlights| 25.09.2015

Water adsorption in SAPO-34: elucidating the role of local heterogeneities and defects using dispersion-corrected DFT calculations

Michael Fischer.

Physical Chemistry Chemical Physics (2015) 17, 25260-25271.

doi:10.1039/C5CP04189A

The chabazite-type silicoaluminophosphate SAPO-34 is a promising adsorbent for applications in thermal energy storage using water adsorption–desorption cycles. In order to develop a microscopic…

MAPEX Research Highlights| 07.09.2015

Tuning emergent magnetism in a Hund's impurity

A. A. Khajetoorians, M. Valentyuk, M. Steinbrecher, T. Schlenk, A. Shick, J. Kolorenc, A. I. Lichtenstein, T. O. Wehling, R. Wiesendanger and J. Wiebe.

Nature Nanotechnology (2015) 10, 958–964.

doi:10.1038/nnano.2015.193

The recently proposed concept of a Hund's metal—a metal in which electron…

MAPEX Research Highlights| 30.08.2015

Nanoscale Origin of Mesoscale Roughening: Real-Time Tracking and Identification of Three Distinct Ruthenium Oxide Phases in Ruthenium Oxidation

Jan Ingo Flege, Benjamin Herd, Jan Goritzka, Herbert Over, Eugene E. Krasovskii and Jens Falta.

ACS Nano (2015) 9, 8468-8473.

doi:10.1021/acsnano.5b03393

The structural modification of the Ru(0001) surface is followed in real-time using low-energy electron microscopy at elevated temperatures…

MAPEX Research Highlights| 30.07.2015

Modulation of Silica Nanoparticle Uptake into Human Osteoblast Cells by Variation of the Ratio of Amino and Sulfonate Surface Groups: Effects of Serum

Shakiba Shahabi, Laura Treccani, Ralf Dringen and Kurosch Rezwan.

ACS Applied Materials & Interfaces (2015) 7, 13821–13833.

doi:10.1021/acsami.5b01900

To study the importance of the surface charge for cellular uptake of silica nanoparticles (NPs), we synthesized five different single- or…

MAPEX Research Highlights| 30.06.2015

Proximity enhanced quantum spin Hall state in graphene

Liangzhi Kou, Feiming Hu, Binghai Yan,Tim Wehling, Claudia Felser, Thomas Frauenheim and Changfeng Chen.

Carbon (2015) 87, 418-423.

doi:10.1016/j.carbon.2015.02.057

Graphene is the first model system of two-dimensional topological insulator (TI), also known as quantum spin Hall (QSH) insulator.…

MAPEX Research Highlights| 30.05.2015

Dinuclear Face-Sharing Bi-octahedral Tungsten(VI) Core and Unusual Thermal Behavior in Complex Th Tungstates

Bin Xiao, Thorsten M. Gesing, Lars Robben, Dirk Bosbach and Evgeny V. Alekseev.

Chemistry – A European Journal (2015) 21, 7746-7754.

doi:10.1002/chem.201500500

Two new thorium tungstates A6Th6(WO4)14O (A=K and Rb) were synthesized by high-temperature solid-state reactions. The structures of both…

MAPEX Research Highlights| 30.04.2015

Phonon-pump extreme-ultraviolet-photoemission probe in graphene: Anomalous heating of dirac carriers by lattice deformation

Isabella Gierz, Matteo Mitrano, Hubertus Bromberger, Cephise Cacho, Richard Chapman, Emma Springate, Stefan Link, Ulrich Starke, Burkhard Sachs, Martin Eckstein, Tim O. Wehling, Mikhail I. Katsnelson, Alexander Lichtenstein and Andrea Cavalleri.

Physical Review Letters (2015) 114, 125503.

doi:10.1…

MAPEX Research Highlights| 31.03.2015

Electron-Induced Hydration of an Alkene: Alternative Reaction Pathways

Jonas Warneke, Ziyan Wang, Petra Swiderek and Jan Hendrik Bredehöft.

Angewandte Chemie International Edition (2015) 54, 4397-4400.

doi:10.1002/anie.201412147

Electron-induced reactions in condensed mixtures of ethylene and water lead to the synthesis of ethanol, as shown by post-irradiation…

MAPEX Research Highlights| 28.02.2015

Robust Two-Dimensional Topological Insulators in Methyl-Functionalized Bismuth, Antimony, and Lead Bilayer Films

Yandong Ma, Ying Dai, Liangzhi Kou, Thomas Frauenheim and Thomas Heine.

Nano Letters (2015) 15, 1083-1089.

doi:10.1021/nl504037u

One of the major obstacles to a wide application range of the quantum spin Hall (QSH) effect is the lack of suitable QSH insulators with a large bulk gap. By means of…

MAPEX Research Highlights| 28.02.2015

Electronic structures and optical properties of partially and fully fluorinated graphene

S. Yuan, M. Roesner, A. Schulz, T. O. Wehling and M. I. Katsnelson.

Physical Review Letters (2015) 114, 047403.

doi:10.1103/PhysRevLett.114.047403

In this Letter, we study the electronic structures and optical properties of partially and fully fluorinated graphene by a combination of ab initio…

MAPEX Research Highlights| 28.02.2015

Two-dimensional Cu2Si monolayer with planar hexacoordinate copper and silicon bonding

L. Yang, V. Bacic, I. A. Popov, A. I. Boldyrev, T. Heine, T. Frauenheim and E. Ganz.

Journal of the American Chemical Society (2015) 137, 2757-2762.

doi:10.1021/ja513209c

Two-dimensional (2D) materials with planar hypercoordinate motifs are extremely rare due to the difficulty in stabilizing the…

MAPEX Research Highlights| 31.01.2015

Bifunctional Submicron Colloidosomes Coassembled from Fluorescent and Superparamagnetic Nanoparticles

T. Bollhorst, S. Shahabi, K. Wörz, C. Petters, R. Dringen, M. Maas and K. Rezwan.

Angewandte Chemie International Edition (2015) 54, 118–123.

doi:10.1002/anie.201408515

Colloidosomes are microcapsules consisting of nanoparticle shells. These microcarriers can be self-assembled from a wide range…

MAPEX Research Highlights| 01.01.2015

Atomic electric fields revealed by a quantum mechanical approach to electron picodiffraction

Knut Müller, Florian F. Krause, Armand Béché, Marco Schowalter, Vincent Galioit, Stefan Löffler, Johan Verbeeck, Josef Zweck, Peter Schattschneider and Andreas Rosenauer.

Nature Communications (2014) 5, 5653.

doi:10.1038/ncomms6653

By focusing electrons on probes with a diameter of 50 pm,…