Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Recent progress of fabrication, characterization, and applications of
  anodic aluminum oxide (AAO) membrane: A review   The progress of membrane technology with the development of membranes with
controlled parameters led to porous membranes. These membranes can be formed
using different methods and have numerous applications in science and
technology. Anodization of aluminum in this aspect is an electro-synthetic
process that changes the surface of the metal through oxidation to deliver an
anodic oxide layer. This process results in a self-coordinated, exceptional
cluster of round and hollow formed pores with controllable pore widths,
periodicity, and thickness. After the initial introduction, the paper proceeds
with a brief overview of anodizing process. That engages anodic aluminum oxide
(AAO) layers to be used as formats in various nanotechnology applications
without the necessity for expensive lithographical systems. This review article
surveys the current status of the investigation on AAO membranes. A
comprehensive analysis is performed on AAO membranes in applications;
filtration, sensors, drug delivery, template-assisted growth of various
nanostructures. Their multiple usages in nanotechnology have also been
discussed to gather nanomaterials and devices or unite them into specific
applications, such as nano-electronic gadgets, channel layers, and clinical
platforms tissue designing. From this review, the fact that the specified
enhancement of properties of AAO can be done by varying geometric parameters of
AAO has been highlighted. No review paper focused on a detailed discussion of
applications of AAO with prospects and challenges. This review paper represents
the formation, properties, applications with objective consideration of the
prospects and challenges of AAO applications. The prospects may appeal to
researchers to promote the development of unique membranes with
functionalization and controlled geometric parameters and check the feasibility
of the AAO membranes in nano-devices.

20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th
10
The categories of this paper are: q-bio
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
24
The categories of this paper are: dg-ga
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
30
The categories of this paper are: q-alg
6
The categories of this paper are: astro-ph