Figure 1
From: Nanocontainers made of Various Materials with Tunable Shape and Size
Schematics for the new four types of nanopores and nanocontainers.
(a) Fabrication of AAO with funnel-like (i), bottle-like (ii), separating-funnel-like (iii) and dropper-like shaped nanopores (iv). For clarity, pores of different morphologies with their corresponding hexagonal cells18 are shown in different colors. 
is the original anodizing voltage and interfaces of AAO formed at different anodizing voltages are indicated by black dotted lines. (b) The four types of nanocontainers of a nanofunnel, a nanobottle, a nano-separating-funnel and a nanodropper. For each segment of the nanocontainers, the anodizing voltage for its corresponding AAO pore segment is marked on its right.
