title: Burstable nanostructured micro-raspberries: Towards redispersible nanoparticles from dry powders.
abstract: Despite immense progress in nanoscience and technology, one of the yet unsolved challenges is the redispersion of nanoparticles from dry powders back to the individual, primary particles. Herein, an easy to handle powder consisting of nanostructured micron sized raspberry-like particles is presented. These nanostructured micro-raspberries are composed of individual nanoparticles which are equipped with molecules that introduce a separating effect or "spring" functionality. Thereby, a powder system is obtained that allows for an easy and complete redispersibility of the agglomerates down to the level of individual nanoparticles in solvents and polymers. The mechanism of redispersibility involves mechanic stimuli/force as well as solvent like disintegration aspects ("like dissolves like" effect). Furthermore, by tailoring the degree of spacer-equipped particles, the bursting behavior can also be tuned, yielding different redispersion degrees. The redispersibility of the nanostructured micro-raspberries is demonstrated in solvents and silicone-based nanocomposites.
authors.affiliation: Fraunhofer Institute for Silicate Research, ISC, Neunerplatz 2, D97082 Würzburg, Germany; Chair of Chemical Technology of Materials Synthesis, Department of Chemistry and Pharmacy, University Würzburg, Röntgenring 11, D97070 Würzburg, Germany.
authors.forename: Claudia
authors.initials: C
authors.lastname: Stauch
authors.affiliation: Fraunhofer Institute for Silicate Research, ISC, Neunerplatz 2, D97082 Würzburg, Germany.
authors.forename: Thomas
authors.initials: T
authors.lastname: Ballweg
authors.affiliation: Fraunhofer Institute for Silicate Research, ISC, Neunerplatz 2, D97082 Würzburg, Germany.
authors.forename: Werner
authors.initials: W
authors.lastname: Stracke
authors.affiliation: Chair of Chemical Technology of Materials Synthesis, Department of Chemistry and Pharmacy, University Würzburg, Röntgenring 11, D97070 Würzburg, Germany.
authors.forename: Robert
authors.initials: R
authors.lastname: Luxenhofer
authors.affiliation: Fraunhofer Institute for Silicate Research, ISC, Neunerplatz 2, D97082 Würzburg, Germany; Chair of Chemical Technology of Materials Synthesis, Department of Chemistry and Pharmacy, University Würzburg, Röntgenring 11, D97070 Würzburg, Germany. Electronic address: karl-sebastian.mandel@isc.fraunhofer.de.
authors.forename: Karl
authors.initials: K
authors.lastname: Mandel
keywords: Nano dispersions; Nano powders; Nanostructured micro-raspberries; Redispersible agglomerates; Redispersible nanoparticles