Abstract: The present invention relates to the field porous crystalline materials, more particularly to metal organic frameworks (MOFs) and covalent organic frameworks (COFs). According to this invention, micelles are used as nanoreactors for the synthesis and stabilisation of porous crystalline materials in aqueous dispersions. Disclosed are dispersions comprising such porous crystalline materials, the synthesis and use of such dispersions. Further disclosed are novel porous crystalline materials, the synthesis and use of such crystalline materials. Further disclosed are novel inks comprising the dispersions and non-solvent, the synthesis and use of such inks for direct printing, 2D printing and 3D printing.

Abstract: An ?-germanium crystals of lamellar morphology is provided, wherein the crystal has one or more nanosheets of germanium stacked on top of one another, as well as two methods of obtaining the crystals. The invention also provides the powder having the ?-germanium crystals of the invention, dispersions having the ?-germanium crystal of the invention or the powder of the invention, as well as the ink having the dispersions.