Katrien De Keukeleere

TL;DR: It is found that the addition of amines provides the basic environment in which carboxylic acids can dissociate and replace chloride and results in stable, aggregate-free dispersions of HfO2 nanocrystals, sterically stabilized by carboxylate ligands.

TL;DR: It is argued that this behavior stems from the dissociative adsorption of carboxylic acids at the oxide surface, and both proton and carboxylate moieties must be regarded as X- type ligands yielding a combined X2 binding motif that allows for self-adsorption and exchange for L-type ligands.

TL;DR: In this article, the authors reported on the synthesis of BaZrO3 nanostructures by bottom-up synthesis methods using both conventional and microwave-assisted solvothermal treatments.

Abstract: Although high temperature superconductors are promising for power applications, the production of low-cost coated conductors with high current densitiesat high magnetic fieldsremains challenging. A superior superconducting YBa2Cu3O7- nanocomposite is fabricated via chemical solution deposition (CSD) using preformed nanocrystals (NCs). Preformed, colloidally stable ZrO2 NCs are added to the trifluoroacetic acid based precursor solution and the NCs' stability is confirmed up to 50 mol% for at least 2.5 months. These NCs tend to disrupt the epitaxial growth of YBa2Cu3O7-, unless a thin seed layer is applied. A 10 mol% ZrO2 NC addition proved to be optimal, yielding a critical current density J(C) of 5 MA cm(-2) at 77 K in self-field. Importantly, this new approach results in a smaller magnetic field decay of J(C)(H//c) for the nanocomposite compared to a pristine film. Furthermore, microstructural analysis of the YBa2Cu3O7- nanocomposite films reveals that different strain generation mechanisms may occur compared to the spontaneous segregation approach. Yet, the generated nanostrain in the YBa2Cu3O7- nanocomposite results in an improvement of the superconducting properties similar to the spontaneous segregation approach. This new approach, using preformed NCs in CSD coatings, can be of great potential for high magnetic field applications.

TL;DR: In this paper, a dual amino-functionalized ionic liquid (DAIL)-modified MIL-101(Cr) framework was used as a catalyst for the selective oxidation of benzyl alcohol using TBHP in chloroform.