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Mesocrystals: Formation, Structure, Properties for Innovative Nanoparticle Assembly

Explore the formation, structure, and properties of mesocrystals, including influences from various factors like size, shape, and external fields. Collaborate on cutting-edge research leading to functionalized nanoparticles and switchable materials.

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Mesocrystals: Formation, Structure, Properties for Innovative Nanoparticle Assembly

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  1. B1: Mesocrystals – Formation, structure and properties - Results Formation Structure Properties Influencingtheproperties: Annealing in different atmospheres Structurepropertyrelation Fe3O4andAunanoparticlessynthesis: Highly monodisperse, variation of size, faceting and habit Synthesis andStructureofMesocrystal • PS Clusters modelparticles • Monitoring aggregation • Showing time dependendclusterformation Effect of experimental (solvent, additives, external field) and nanoparticle variables (size, shape, surface, solvent, magnetic field, etc.) on mesocrystal structure. Formation of Mesocrystals • Algorithmdevelopment: • Detectingformationofoligomers • Ableto follow particleaggregationandseperation live in situ • Detectionofsmalloligomerspossible

  2. B1: Mesocrystals – Formation, structure and properties - Aims Formation Structure Properties • Ensemble measurements • Measuringelec- tronicbehaviour • Device physics (e.g. resitiveswitching) Experiments to the influence of the Particles: size, faceting, habit Dispersion medium and additives External Field and Temperature Surfactant/surfactant concentration … to the self-assembly Mesocrystal characterization: Reveal crystal structure of the mesocrystals and defects using TEM,ED, EHT, STEM-T, SEM, SAXS, WAXS and CXDI Properties: magnetic, optical, electronic transport • PS Cluster modelparticles • Kineticsof Cluster formationusing PTM data • Supplementary TEM, SEM and DLS forvalidation • Mesocrystal formation • Au-Cubes: simulations, measurements, evaluation • Show mesocrystal formationkinetics in situ • SAXS measurements • Single nanowiremeasurement • Measuring electronic behaviour • Temperaturedependence, etc. Functionalizationof Au NP with Photo-switchable thiols Electricallyconductivethiols andassemblyto mesocrystals Formation of Mesocrystals

  3. B1: Mesocrystals – Formation, structure and properties – Current Collaborations Formation Structure Properties • Project A1: S. Theiß, S. Polarz • SAXS characterisationofmesocrystals • Felizitas Kirner Project B1 • Au particlesynthesisand mesocrystal synthesis • Alexander Wittemann and Simone Plüisch Project A10 • PS modelparticlesand Clusters • Polarz • Melanie Gerigk, Bastian Trepka • Project A5: I. Wimmer, M. Fonin • Magnetic properties of mesocrystals • Project A10: R. Stuckert, A. Wittemann • assembly of 2D mesocrystal in a Langmuir trough • Project B2: J-M. Meijer, G. Maret • Structureof 2D assemblies (Au andAg) • Project Z1: R. Rosenberg, E. Harbalik, B. Bössenecker, S. Polarz • Characterization of NPs and Mesocrystal Formation of Mesocrystals

  4. B1: Mesocrystals – Formation, structure and properties – Outlook until 2020 Functionalization of Au NP with Photo-switchable Thiols Electrically conductive Thiols and assembly to Mesocrystals Light-induced reversible switching of Diarylethene (DAE) molecules DAE switching fragment decorated with thiosemicarbazide (TSC) side-arms (in collaboration with Dr. DmytroSysoiev) Formation of Mesocrystals

  5. B1: Mesocrystals – Formation, structure and properties – Outlook until 2020 Functionalization of Au NP: assembly to Mesocrystals Thermal switching, later photo switching Patterned assembly Formation of Mesocrystals

  6. B1: Mesocrystals – Formation, structure and properties – Outlook after 2020 Photoswitches InterestingSpiropyranebasedphotoswitchesformetals (- SH) ormetaloxides (-silanes) Tanja Gaich Nanoparticles: Au nanorodsandcubes ZnOnanorods Magnetite orothermagneticmaterialsfrom A1 Formation of Mesocrystals

  7. B1: Mesocrystals – Formation, structure and properties – Outlook after 2020 Modular Polymer forMultifunctionalityincludingthermo / photoswitches Huisgenadditionofazidestotriplebond Thio-clickto double bond Multifunctionalandswitchabletoolbox Formation of Mesocrystals

  8. B1: Mesocrystals – Formation, structure and properties – Outlook after 2020 Mesocrystal Primary nanoparticles > 3 nm Temporary Stabilization Collective Properties switched on Whatarethecollective / emergentproperties vs. individual properties ? Mesoscale assembly Useexistingknowledgeof soft assemblytocontrol Forswitchablemolecules, observeassemblyfromnanoparticletocollectiveassembly. Are therulesthe same ? Anisotropiccooperative electronic andopticalproperties Assembly in patterned structures: Formation of switchable networks Individual Properties switched on T, pH, l Systems: Magnetite Zinc Oxide Gold (all asrods) Formation of Mesocrystals

  9. B1: Mesocrystals – Formation, structure and properties – Future Collaborations Formation, structure and Properties ZnOnanorods (A1 Polarz) TheoryofMesocrystalformation (A4 Nielaba) Magneticcharacterizationofswitchablemesocrystals (A5 Fonin) New Projects: Tanja Gaich: Spiropyranphotoswitches Peter Baum: Switchable Au Mesocrystals Johannes Boneberg: Laser writtenphotoswitchablemesocrystals Christina Agudo: AFM forcespectoscopy Polarz, Schmidt-Mende, Leitenstorfer: Barcode Nanowires Formation of Mesocrystals

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