Preparation and characterization of anodic aluminum oxide films exhibiting microporosity

Salmas, CE; Androutsopoulos, GP

dc.contributor.author	Salmas, CE	en
dc.contributor.author	Androutsopoulos, GP	en
dc.date.accessioned	2014-03-01T01:31:41Z
dc.date.available	2014-03-01T01:31:41Z
dc.date.issued	2009	en
dc.identifier.issn	0098-6445	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/19889
dc.subject	Anodic alumina	en
dc.subject	Inorganic membranes	en
dc.subject	Microporosity	en
dc.subject	Pore tortuosity	en
dc.subject.classification	Engineering, Chemical	en
dc.subject.other	Alumina	en
dc.subject.other	Aluminum sheet	en
dc.subject.other	Catalysis	en
dc.subject.other	Electric batteries	en
dc.subject.other	Film preparation	en
dc.subject.other	Fuel cells	en
dc.subject.other	Membranes	en
dc.subject.other	Microporosity	en
dc.subject.other	Oxide films	en
dc.subject.other	Pore size	en
dc.subject.other	Pore structure	en
dc.subject.other	Porosity	en
dc.subject.other	Secondary emission	en
dc.subject.other	Sorption	en
dc.subject.other	Surfaces	en
dc.subject.other	Anodic alumina	en
dc.subject.other	Anodic aluminas	en
dc.subject.other	Anodic aluminum oxides	en
dc.subject.other	Anodization	en
dc.subject.other	Anodization times	en
dc.subject.other	Applications.	en
dc.subject.other	Catalytic reactions	en
dc.subject.other	Electrochemical applications	en
dc.subject.other	External surfaces	en
dc.subject.other	Gas separations	en
dc.subject.other	Gas sorptions	en
dc.subject.other	High surface areas	en
dc.subject.other	Hydrothermal treatments	en
dc.subject.other	Inorganic membranes	en
dc.subject.other	Nitrogen sorptions	en
dc.subject.other	Pore architectures	en
dc.subject.other	Pore connectivities	en
dc.subject.other	Pore lengths	en
dc.subject.other	Pore size distributions	en
dc.subject.other	Pore tortuosity	en
dc.subject.other	SEM imaging	en
dc.subject.other	SEM micrographs	en
dc.subject.other	Specific surfaces	en
dc.subject.other	Structure changes	en
dc.subject.other	Structure models	en
dc.subject.other	Surface areas	en
dc.subject.other	Gas permeable membranes	en
dc.title	Preparation and characterization of anodic aluminum oxide films exhibiting microporosity	en
heal.type	journalArticle	en
heal.identifier.primary	10.1080/00986440802483913	en
heal.identifier.secondary	http://dx.doi.org/10.1080/00986440802483913	en
heal.language	English	en
heal.publicationDate	2009	en
heal.abstract	Anodic alumina materials exhibiting regular pore structure, microporosity, and extensive surface areas were prepared and characterized. The effects of current density, (J = 12-35 mA/cm2), anodization time (t = 30-150 min), and hydrothermal treatment on pore structure were investigated. Nitrogen sorption hysteresis was simulated using the corrugated pore structure model (CPSM). Pore size distributions, relative specific surface area (SCPSM/Sext = 870-8645), microporosity (max ∼33.0%), pore tortuosity (TCPSM = 3.1-5.7), pore connectivity (c = 3.02-4.85, Seaton's model), and nominal pore length values (i.e., Ns = 3-10, from CPSM, and L = 0.91-1.20, Seaton) were evaluated. Pore sizes dpore > 13 nm deduced via CPSM simulation of gas sorption data were also detected by SEM imaging. A minimum external surface pore density of ∼7.5 × 1010 pores/cm2 was evaluated from the SEM micrograph. Anodization conditions and the following treatment caused a severe pore structure change. Pore tortuosity (TCPSM) changes inversely proportionally to pore connectivity (c), while the nominal pore length (Ns) varies proportionally to the number of pore length (L). It is concluded that materials possessing microporosity, regular pore architectures, and high surface areas can become potential candidate membranes for gas separation and catalytic reaction applications. They can also be used as templates in electrochemical applications (e.g., solar and fuel cells).	en
heal.publisher	TAYLOR & FRANCIS INC	en
heal.journalName	Chemical Engineering Communications	en
dc.identifier.doi	10.1080/00986440802483913	en
dc.identifier.isi	ISI:000260905300001	en
dc.identifier.volume	196	en
dc.identifier.issue	4	en
dc.identifier.spage	407	en
dc.identifier.epage	442	en