Located between the frustoconical needle tip and the cylindrical needle shank of a nozzle needle of a fuel injection valve is a frustoconical needle portion, into which is introduced a peripheral groove. The burner is also provided with means for preventing flame propagation, of the fluid flow splitting type, which comprises at least one substantially tubular body, with relative lateral walls extending at least between the injector and the intake section of the Venturi effect mixer, advantageously consisting of at least one helically wound filiform element. The receptor molecule is different than the surfactant. The liquid crystal layer is disposed in a space between the first alignment film of the first substrate and the coplanar transparent electrode layer of the second substrate.