Table 3.

Zinc‐ NPs syntheses in continuous flow.

Oxide	Reactants	Methodology	Year	T	Shape	Size[a] [nm]	Size distribution [σd/d]	Ref.
ZnO	ZnCl2+NH4(CO2NH2)	FIS	1999	RT	rods	10–15[b]	–	[44]
ZnO	Zn(AcO)2+NaOH	microreactor chip	2014	60 °C	spherical	3–5	–	[45]
ZnO	Zn(AcO)2+TMAOH (w/an organic acid)	convective tangential micromixer+coil reactor	2014	20–80 °C	–	3.7[c]	0.11[c]	[51]
ZnO	Zn(NO3)2+NaOH (microemulsions)	micromixer+coil reactor	2014	40–70 °C	–	10–20[d]	–	[49]
ZnO	Zn(NO3)2+NaOH	microreactor chips	2017	60 °C	spheres	10 nm	–	[46]
					spindles	300–600 nm	–
ZnO	Zn(AcO)2+NaOH	droplet‐based mircroreactor	2017		spherical	49.6	0.16	[50]
ZnO	Zn(NO3)2+NaOH	spiral microreactor	2019	RT	spheres	583	0.21	[47]
					cubes	153	0.24

[a] Calculated by TEM/SEM analysis. [b] Diameter. [c] At 20 °C. [d] The NPs size depended on the employed conditions (flow rate, T, zinc concentration) fairly monodispersed NPs were obtained in single runs.