Development of an optical model for steady state porous anodic films on aluminium formed in phosphoric acid

Laet, J. De; Terryn, Herman; Vereecken, Jean

doi:10.1016/s0040-6090(97)00741-4

Cited by 46 publications

(27 citation statements)

References 12 publications

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“…The void fraction is directly related to the optical functions of the film in EMA. However, it is important to notice that the AAO film in Ref, [7] has round bottom shape of non-uniform structure as shown in Fig. 1d, while the film in current work has a uniform structure down to the bottom of the film layer as shown in Fig.…”

Section: Isotropic Ema Analysismentioning

confidence: 67%

“…5 shows remarkably improved fit after introduction of anisotropic optical characteristic of AAO film, which was proposed in Ref. [7], using different void fractions along xy and z axis in EMA. The void fraction is directly related to the optical functions of the film in EMA.…”

Section: Isotropic Ema Analysismentioning

confidence: 81%

“…There are a few spectroscopic ellipsometry (SE) studies on round bottom porous AAO films [7,8], which are combined structures of hemispherical bottom and flat cylindrical parts. Therefore, in the analysis of the optical response of these films, there is some uncertainty that any errors in one part could be cancelled out by the contributions from the other part.…”

Section: Introductionmentioning

confidence: 99%

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Ellipsometric analysis of porous anodized aluminum oxide films

et al. 2009

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Section: Isotropic Ema Analysismentioning

confidence: 67%

Section: Isotropic Ema Analysismentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

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Ellipsometric analysis of porous anodized aluminum oxide films

et al. 2009

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“…Obtained experimental dependencies were analyzed using model by Saito and Miyagi [8,9,10]. In this model, for a«b«λ, where a -radius of the pore, b -distance between pore Molecular Crystals and Liquid Crystals 2015.611:132-138. cylinders, λ -wavelength.…”

Section: Methodsmentioning

confidence: 99%

Nanostructures on the Basis of Porous Alumina with Intercalated with Cholesteric Liquid Crystal

Andrushchak

Hotra

Mykytyuk

et al. 2015

Molecular Crystals and Liquid Crystals

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The introduction of liquid crystal materials into the porous material host will help us to get optically active nanocomposites. Nanocomposite based on aluminum oxide host with cholesteric liquid crystal is characterized by a shift of bandwidth wavelength minimum. In case of intercalation of cholesteric liquid crystals into the pores of aluminum oxide host the shift of transmittance minimum into the short wave region are observed. We analyzed the ways, which indicate the deformation of the pitch of the cholesteric helix and showed the role of capillary forces in the deformation of the pitch of cholesteric liquid crystal.

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“…Controlling anodising parameters allows, within some limits, programming the selected functional properties of future upper layers. [3][4][5][6][7][8][9][10][11][12] The above-mentioned method consists of oxidising aluminium and its alloys in three-component electrolytes. Dicarboxylic acid is added to the mixture of sulphuric and oxalic acids.…”

Section: Introductionmentioning

confidence: 99%

The structure and morphology of the surface of duplex layers after saturation of the base layer with carbon

Skoneczny¹

2016

Mater. Tehnol.

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The paper presents a new method of obtaining aluminium-oxide-based, duplex-type layers. In the first stage, the base layer is produced via the hard anodising of aluminium alloys in order to obtain the optimal structural and morphological properties. Following anodising, the samples with an Al2O3 layer are rinsed in distilled water in order to remove the electrolyte. Graphite was introduced into the structure of aluminium oxide during a thermal treatment in a solid medium consisting of graphite dust. Afterwards, the properties of the obtained layers were determined using a scanning electron microscope, a transmission electron microscope and an atomic force microscope (AFM), as well as X-ray diffraction. The structure of the duplex-type layers contains carbon and other precipitates, which are typical for an alloy with additions of Fe, Mn, Cr and other elements. Carbon precipitates have a relatively weak connection with the matrix, as an envelope with numerous discontinuities forms around each carbon precipitate. Carbon precipitates are considerably larger than alloy precipitates, have micrometre dimensions, occur in groups and are composed of small grouped nanometric particles that form larger agglomerates. This means that there are nanometric particles inside the micrometric ones. Keywords: aluminium alloys, nano-layers, SEM, AFM, EDŜ lanek predstavlja novo metodo za izdelavo dupleksne plasti aluminijevega oksida. V prvi stopnji se izdela osnovna plast s trdim anodiziranjem aluminijevih zlitin, da se dobi optimalno strukturo in morfolo{ke lastnosti. Po anodizaciji so vzorci z Al2O3 plastjo potopljeni v destilirano vodo, da se izpere elektrolit. V strukturo aluminijevega oksida se uvede grafit med toplotno obdelavo v trdem mediju, ki je vseboval grafitni prah. Potem so bile dolo~ene lastnosti dobljenih plasti, s pomo~jo vrsti~nega elektronskega mikroskopa, presevnega mikroskopa in mikroskopa na atomsko silo (AFM), kot tudi z rentgensko difrakcijo. Struktura dupleksnih plasti je vsebovala izlo~ke ogljika in druge izlo~ke, ki so zna~ilni za zlitine, z dodatkom Fe, Mn, Cr in drugih elementov. Izlo~ki ogljika imajo relativno {ibko povezavo z osnovo, saj nastaja okrog vsakega izlo~ka ogljika ovojnica s {tevilnimi diskontinuitetami. Izlo~ki ogljika so mnogo ve~ji kot izlo~ki zlitin, imajo mikrometrske dimenzije, se pojavljajo v skupinah in so sestavljeni iz malih gru~nanometri~nih delcev, ki tvorijo ve~je skupke. To pomeni, da so znotraj mikrometrskih delcev prisotni nanometrski delci.

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Development of an optical model for steady state porous anodic films on aluminium formed in phosphoric acid

Cited by 46 publications

References 12 publications

Ellipsometric analysis of porous anodized aluminum oxide films

Ellipsometric analysis of porous anodized aluminum oxide films

Nanostructures on the Basis of Porous Alumina with Intercalated with Cholesteric Liquid Crystal

The structure and morphology of the surface of duplex layers after saturation of the base layer with carbon

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