Catalyst composition comprises a mixture of iron and cobalt in any form of oxidation and catalyst support comprising exfoliated vermiculite. Independent claims are included for: (1) synthesizing the catalyst composition, comprising exfoliating the vermiculite by treating vermiculite ore at above 800[deg] C, contacting the exfoliated vermiculite with a solution of a salt of cobalt and iron, and calcining the contacted vermiculite at above 350[deg] C; and (2) synthesizing carbon nanotubes by decomposition of hydrocarbon gas on the catalyst composition, comprising conditioning the catalyst composition in an inert atmosphere, and contacting the catalyst composition with a source of carbon gas at 600-800[deg] C for at least 5 minutes.

The present invention provides a method for producing a particle composition, comprising heating at least one lithium-based compound precursor to form a solid body comprising a lithium-based compound, processing the solid body to form feed particles comprising the lithium-based compound, and milling the feed particles to form a composition including lithium-based compound milled particles having an average particle size of less than 100 nm. Also provided is a method for producing a particle composition, comprising milling a feed material comprising at least one lithium-based compound precursor to form a first milled particle composition including milled particles, forming aggregates including the milled particles, processing the aggregates to form a composition comprising a lithium-based compound, and milling the composition to form a second milled particle composition including milled particles having an average particle size of less than 100 nm.

Multilayered honeycomb panel (5) composed of a honeycomb core (3) and two skins (4) from composite material with glass or carbon fibers in a thermoplastic polymer matrix. The honeycomb core (3) is made from a single tape from the same composite material wound in successive layers thus forming a characteristic grid shape which is composed of equilateral triangles. In the triangular gaps formed by the winding of the longitudinal reinforcement (1) triangular prismatic cells are bonded made from the same material with fiber reinforcement at ±45° to the vertical thus forming the honeycomb core through autogenous bonding. On both flat surfaces of this core two skins (4) made from the same U-D reinforced material are placed and bonded again autogenously forming the desired panel. Further reinforcement of the matrix can be achieved with the insertion of suitably arranged carbon nanotubes. Due to the materials, the geometry and the manufacturing method the proposed panel exhibits higher shear, flexural and compressive strength to weight ratio than the existing panels with similar reinforcement.