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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 44: Complex Fluids, Colloids, Micelles and Vesicles (joint session CPP/DY)

CPP 44.8: Talk

Thursday, March 21, 2024, 17:30–17:45, H 0110

Cryo Atom Probe Studies of 5CB, 8CB and Their Mixture — •Kuan Meng, Patrick Stender, Sebastian Eich, and Guido Schmitz — Stuttgart University, Institute for Materials Science, Heisenbergstr. 3, 70569, Stuttgart, Germany

The development of Cryo-FIB enabled studies of various delicate samples of high interest, such as SEI, ferritin and porous borosilicate. Generally, frozen organic materials exhibit complex mass spectra and a high dependence on measurement parameters. Following our earlier measurements on frozen liquids [1], we are studying the evaporation and fragmentation of different liquid crystals. In detail, 5CB (4-Cyano-4’-pentylbiphenyl) and 8CB (4-Cyano-4’-octylbiphenyl) were chosen for investigation due to their relatively simple chemical structure and hydrophobically-induced stability.

Both types of samples, pure 5CB and 8CB, evaporate predominantly as intact molecules, which suits our previous observation in the n-tetradecane study [1]. As a consequence, these two type of molecules can be distinguished even in the mixture, due to their effective mass difference. The dependence of mass spectra on the evaporation conditions and the miscibility of both species will be presented in the talk.

[1] Meng, K., Schwarz, T., Weikum, E., Stender, P., & Schmitz, G. (2022). Frozen n-Tetradecane Investigated by Cryo-Atom Probe Tomography. Microscopy and Microanalysis, 28(4), 1289-1299.

Keywords: Atom Probe Tomography; Cryo-FIB; Organic Liquids