Size selection was demonstrated to suppress Ostwald ripening of supported catalytic nanoparticles. When the clusters are subnanometer in size and highly fluxional, such as Pt on rutile TiO2(110) surface, this paradigm breaks down, established theory sintering needs a revision. At temperatures characteristic catalysis (i.e. 700 K), sub-nano thermally populate many low-energy metastable isomers. ...

Platinum is known as a catalyst with exceptional reactivity for many important reactions, e.g. the oxygen reduction reaction. To reduce the high cost of pure platinum catalysts, platinum on a carbon support is widely used in industrial fuel cell applications. However, these Pt/C systems suffer from poor stability. As a cost-efficient and more durable alternative, Pt single-atom catalysts on a T...

Background: Chitosan nanoparticles have become of great interest for nanomedicine, biomedical engineering and development of new therapeutic drug release systems with improved bioavailability, increased specificity and sensitivity, and reduced pharmacological toxicity. The aim of the present study is to synthesis and optimization of chitosan nanoparticles for industrial and biomedical applicati...

One of the difficulties in standard growth of metallic nano-clusters on oxide substrates as model catalysts is the strong coupling between clusters size and density. Employing multiple cycles, amorphous solid water-buffer layer assisted growth (ASW-BLAG) procedure, we demonstrate how the size to density coupling can be eliminated under certain conditions. In this study, gold clusters were depos...

The structural changes in electrodeposited palladium (Pd) films with desorption of co-deposited hydrogen were investigated, and the existing states Pd film analyzed. from an alkaline bath consisted (II) chloride, ammonium citric acid. Two pronounced peaks at around 500 K 880 observed thermal spectrum as-deposited film. For lower concentrations, lattice contraction proceeded concurrently room te...

Pure and doped sub-nanoclusters can exhibit superb catalytic activity, which, however, strongly depends on their size, shape, composition, and the nature of the support. This work is about surface-deposited sub-nano Pt-based clusters, which are promising catalysts for the reactions of dehydrogenation. Using density functional theory and ab initio calculations, and an ab initio genetic algorithm...

This paper proposes a first attempt to define a two-scales kinetic theory description of suspensions involving short fibers, nano-fibers or nanotubes. We start revisiting the description of dilute enough suspensions for which microscopic, mesoscopic and macroscopic descriptions are available and all them have been successfully applied for describing the rheology of such suspensions. When the su...