3 research outputs found
Die Wirkung von Yoga auf Reiterinnen
Viele Reiter fühlen sich nicht fit fürs Pferd. Fehlende Beweglichkeit und Kraft können eine Ursache für einen Trainingsstillstand sein.Wie sieben jungen Reiterinnen die regelmäßige Praxis von Yoga zu einem besseren Gefühl im Sattel verhelfen konnte und welche weiteren positiven Effekte das Training auf Körper und Geist hat, zeigt diese Studie im Rahmen einer Bachelorarbeit an der HfWU Nürtingen
Two-Step Delamination of Highly Charged, Vermiculite-like Layered Silicates via Ordered Heterostructures
Because
of strong Coulomb interactions, the delamination of charged
layered materials becomes progressively more difficult with increasing
charge density. For instance, highly charged sodium fluorohectorite
(Na<sub>0.6</sub>Mg<sub>2.4</sub>Li<sub>0.6</sub>Si<sub>4</sub>O<sub>10</sub>F<sub>2</sub>, Na-Hec) cannot be delaminated directly by
osmotic swelling in water because its layer charge exceeds the established
limit for osmotic swelling of 0.55 per formula unit Si<sub>4</sub>O<sub>10</sub>F<sub>2</sub>. Quite surprisingly, we found that this
hectorite at the border of the smectite and vermiculite group can,
however, be utterly delaminated into 1-nm-thick platelets with a high
aspect ratio (24 000) in a two-step process. The hectorite
is first converted by partial ion exchange into a one-dimensionally
ordered, interstratified heterostructure with strictly alternating
Na<sup>+</sup> and <i>n</i>-butylammonium (C4) interlayers.
This heterostructure then spontaneously delaminates into uniform single
layers upon immersion in water whereas neither of the homoionic phases
(Na-Hec and C4-Hec) swells osmotically. The delamination of more highly
charged synthetic layered silicates is a key step to push the aspect
ratio beyond the current limits
Strategies for the selective loading of patchy worm-like micelles with functional nanoparticles
Block copolymer self-assembly in solution paves the way for the construction of well-defined compartmentalized nanostructures. These are excellent templates for the incorporation and stabilisation of nanoparticles (NPs), giving rise to highly relevant applications in the field of catalysis or sensing. However, the regio-selective incorporation of NPs in specific compartments is still an issue, especially concerning the loading with different NP types. Using crystallisation-driven self-assembly (CDSA), functional worm-like crystalline-core micelles (wCCMs) with a tailor-made, nanometre-sized patchy corona were prepared as versatile templates for the incorporation and stabilisation of metal and metal oxide NPs. Different strategies, like ligand exchange or co-precipitation of polymer stabilised NPs with one surface patch, were developed that allow the incorporation of NPs in specific regions of the patchy wCCM corona. Independent of the NP type and the incorporation method, the NPs showed no tendency for agglomeration and were fixed within the corona patches of the wCCMs. The binary loading of patchy micelles with metal and metal oxide NPs was realised by combining different loading strategies, yielding hybrids with homogeneously dispersed NPs guided by the patchy structure of the template