Phase Separation and Nanostructure Formation in Binary and Ternary Blends of Spiro-Linked Molecular Glasses.

Understanding phase separation phenomena in blends of organic electron acceptor and donor materials is of special interest in the context of organic optoelectronic applications. In this study, we focus on the phase behavior of a special class of spiro-linked compounds, which serve as model systems for morphological control in phase-separated small-molecule electron donor-acceptor blends. Thermal analysis and quantitative image analysis were the key techniques for developing a suitable approach for modeling the phase diagram with minimal material consumption.

Photoinduced sign change of the magnetoresistance in field-effect transistors based on a bipolar molecular glass.

The application of a novel bipolar molecular glass in field-effect transistors leads to devices with photoinduced magnetoresistance (MR) sign change. In darkness a low external magnetic field increases the resistance (positive MR up to +0.1%), while a magnetic-field induced resistance decrease (negative MR up to -6.

Large molecular aggregates: From atmospheric aerosols to drug nanoparticles.

Large molecular aggregates with sizes ranging from subnanometers to microns are ubiquitous. As atmospheric aerosols they influence our climate, in interstellar space they are discussed as reactive sites, and in medicine small particles are considered as promising candidates to achieve a targeted drug delivery. The present contribution is focused on the characterization of the physical-chemical properties of these particles and on their targeted generation.

Unraveling the origin of band shapes in infrared spectra of N2O-12CO2 and 12CO2-13CO2 ice particles.

Band structures in the region of strong infrared absorption bands for different N2O-12CO2 and 12CO2-13CO2 composite particles are investigated by combining quantum mechanical exciton calculations with systematic experimental investigations. The ice particles are generated by collisional cooling and characterized with rapid-scan infrared spectroscopy. The size of the particles lies between approximately 10 and 100 nm.