Highly resolved fluorescent patterns are generated in an individual silver‐exchanged K‐A zeolite crystal using two‐photon excitation (see figure). The high stability, brightness, and spatial resolution of the patterns are an important advantage over the current state‐of‐the‐art techniques in optical encoding of microcarriers. Therefore, this material shows high potential as a quality and/or safety label to prevent counterfeiting or as an advanced biolabel.

Katalyse in neuem Licht: Mithilfe hochauflösender Fluoreszenzmikroskopie gelang es erstmals, Transportphänomene und deren Rolle in der Katalyse auf Einzelpartikelebene zu kartieren. Der Thiele‐Modul konnte partikelweise in nur einem einzigen Experiment gemessen werden, und er beweist das Vorliegen von Diffusionsbeschränkungen bei der Ti‐MCM‐41‐katalysierten Epoxidierung eines fluoreszierenden Reportermoleküls (siehe Bild; TBHP=tert‐Butylhydroperoxid).

Shedding light on catalysis: For the first time, transport phenomena and their influence on catalysis are directly observed for individual catalytic particles by single‐turnover mapping using high‐resolution fluorescence microscopy. The Thiele modulus could be measured with just one experiment, proving the existence of diffusional limitations for the Ti‐MCM‐41 catalyzed epoxidation of a fluorescent reporter molecule (see picture; TBHP=tert‐butylhydroperoxide).

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Pore mouth hydrogenation of vegetable oil with Pt/ZSM-5 is confirmed by the similar intermediately melting product selectivity for various crystal sizes.