Publications by authors named "M Picher"
Spin-crossover particles of [Fe(Htrz)trz](BF) with sizes of some hundred nanometers are studied by electron microscopy. Despite their high radiation sensitivity, it was possible to analyze the particles by imaging and diffraction so that a detailed analysis of crystallographic defects in individual particles became possible. The presence of one or several tilt boundaries, where the tilt axis is the direction of the polymer chains, is detected in each particle.
View Article and Find Full Text PDFAn unusual expansion dynamics of individual spin crossover nanoparticles is studied by ultrafast transmission electron microscopy. After exposure to nanosecond laser pulses, the particles exhibit considerable length oscillations during and after their expansion. The vibration period of 50-100 ns is of the same order of magnitude as the time that the particles need for a transition from the low-spin to the high-spin state.
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- Thermal decomposition is an effective method for creating nanosized metal oxides with specific properties, especially iron oxide nanoparticles.
- The study examines the nucleation process in this synthesis, finding that it doesn't occur homogeneously but instead within vesicle-like nanoreactors.
- The new mechanism involves steps like melting iron stearate particles, forming a unique crystalline phase, and producing iron oxide nuclei inside these nanoreactors, enhancing control over nanoparticle characteristics.
Spin crossover (SCO) is a promising switching phenomenon when implemented in electronic devices as molecules, thin films or nanoparticles. Among the properties modulated along this phenomenon, optically induced mechanical changes are of tremendous importance as they can work as fast light-induced mechanical switches or allow to investigate and control microstructural strains and fatigability. The development of characterization techniques probing nanoscopic behavior with high spatio-temporal resolution allows to trigger and visualize such mechanical changes of individual nanoscopic objects.
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- Current treatment options for auditory synaptopathies, including genetic hearing disorders, primarily involve hearing aids or cochlear implants, but future gene therapy may offer a more effective solution.
- The genetic hearing impairment DFNB93, linked to mutations in the CABP2 gene, affects inner hair cell function without causing early degeneration, making it a suitable candidate for gene therapy intervention.
- In preclinical studies using viral vectors, researchers successfully restored inner hair cell function and improved hearing in mice with DFNB93, indicating that gene therapy could be a viable treatment option in the future.