On The Generation of Interferometric Colors in High Purity and Technical Grade Aluminum: An Alternative Green Process for Metal Finishing Industry

Chen, Yuting; Santos, Abel; Ho, Daena; Wang, Ye; Kumeria, Tushar; Li, Junsheng; Wang, Changhai; Lošić, Dušan

doi:10.1016/j.electacta.2015.06.066

Cited by 43 publications

(38 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For instance, alumina (Al 2 O 3 ) has lower effective refractive index (n Alumina = 1.77) than that of silicon (n Si = 3.48). [28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45] Regardless of these advances, more fundamental studies should be carried out in order to establish rational anodisation approaches aimed to engineer the effective medium of NAA with precision, so that anodisation waves can be directly translated into changes in porosity in NAA. Anodisation (i.e.…”

Section: Introductionmentioning

confidence: 99%

Realisation and advanced engineering of true optical rugate filters based on nanoporous anodic alumina by sinusoidal pulse anodisation

et al. 2016

Self Cite

View full text Add to dashboard Cite

This study is the first realisation of true optical rugate filters (RFs) based on nanoporous anodic alumina (NAA) by sinusoidal waves. An innovative and rationally designed sinusoidal pulse anodisation (SPA) approach in galvanostatic mode is used with the aim of engineering the effective medium of NAA in a sinusoidal fashion. A precise control over the different anodisation parameters (i.e. anodisation period, anodisation amplitude, anodisation offset, number of pulses, anodisation temperature and pore widening time) makes it possible to engineer the characteristic reflection peaks and interferometric colours of NAA-RFs, which can be finely tuned across the UV-visible-NIR spectrum. The effect of the aforementioned anodisation parameters on the photonic properties of NAA-RFs (i.e. characteristic reflection peaks and interferometric colours) is systematically assessed in order to establish for the first time a comprehensive rationale towards NAA-RFs with fully controllable photonic properties. The experimental results are correlated with a theoretical model (Looyenga-Landau-Lifshitz - LLL), demonstrating that the effective medium of these photonic nanostructures can be precisely described by the effective medium approximation. NAA-RFs are also demonstrated as chemically selective photonic platforms combined with reflectometric interference spectroscopy (RIfS). The resulting optical sensing system is used to assess the reversible binding affinity between a model drug (i.e. indomethacin) and human serum albumin (HSA) in real-time. Our results demonstrate that this system can be used to determine the overall pharmacokinetic profile of drugs, which is a critical aspect to be considered for the implementation of efficient medical therapies.

show abstract

Section: Introductionmentioning

confidence: 99%

Realisation and advanced engineering of true optical rugate filters based on nanoporous anodic alumina by sinusoidal pulse anodisation

et al. 2016

Self Cite

View full text Add to dashboard Cite

show abstract

“…[7][8][9][10][11][12][13] This nanoporous material can be produced by a cost-competitive and industrially scalable process, traditionally used by metal finishing industry. [14][15][16] Moreover, NAA is biocompatible and has good mechanical strength, thermal stability, chemical resistance and its nanopores feature a highly controllable and versatile cylindrical geometry. 3,4 In spite of these advantages, the generation of NAA-based photonic structures with precisely engineered optical properties has remained challenging due to the intrinsic limitations of this nanomaterial (i.e.…”

Section: Introductionmentioning

confidence: 99%

Rational engineering of nanoporous anodic alumina optical bandpass filters

et al. 2016

Self Cite

View full text Add to dashboard Cite

Herein, we present a rationally designed advanced nanofabrication approach aiming at producing a new type of optical bandpass filters based on nanoporous anodic alumina photonic crystals. The photonic stop band of nanoporous anodic alumina (NAA) is engineered in depth by means of a pseudo-stepwise pulse anodisation (PSPA) approach consisting in pseudostepwise asymmetric current density pulses. This nanofabrication method makes it possible to tune the transmission bands of NAA at specific wavelengths and bandwidths, which can be broadly modified across the UV-visible-NIR spectrum through the anodisation period (i.e. time between consecutive pulses). First, we establish the effect of the anodisation period as a means of tuning the position and width of the transmission bands of NAA across the UV -visible-NIR spectrum. To this end, a set of nanoporous anodic alumina bandpass filters (NAA-BPFs) are produced with different anodisation periods, ranging from 500 to 1200 s, and their optical properties (i.e. characteristic transmission bands and interferometric colours) are systematically assessed. Then, we demonstrate that the rational combination of stacked NAABPFs consisting of layers of NAA produced with different PSPA periods can be readily used to create a set of unique and highly selective optical bandpass filters with characteristic transmission bands, the position, width and number of which can be precisely engineered by this rational anodisation approach. Finally, as a proof-of-concept, we demonstrate that the superposition of stacked NAA-BPFs produced with slight modifications of the anodisation period enables the fabrication of NAA-BPFs with unprecedented broad transmission bands across the UV-visible-NIR spectrum. The results obtained from our study constitute the first comprehensive rationale towards advanced NAA-BPFs with fully controllable photonic properties. These photonic crystal structures could become a promising alternative to traditional optical bandpass filters based on glass and plastic.

show abstract

“…Typically, the two-step anodization of aluminium is conducted in sulfuric [14,15], oxalic [16,17] and phosphoric [18,19] acid aqueous solution at voltages in the range of [15][16][17][18][19][20][21][22][23][24][25] and 120-195 V, respectively. Depending on the anodization electrolyte, it is possible to obtain AAO membrane with cell diameter in the range of 25-75, 75-125, 375-525 nm in sulphuric, oxalic and phosphoric acid solution as electrolyte, respectively.…”

Section: Introductionmentioning

confidence: 99%

Characterization of nanopores arrangement of anodic alumina layers synthesized on low-(AA1050) and high-purity aluminum by two-step anodizing in sulfuric acid with addition of ethylene glycol at low temperature

2016

View full text Add to dashboard Cite

In this work the anodic aluminum oxide (AAO) was produced by two-step self-organized anodization of two classes purity aluminum in 0.3 M sulfuric acid aqueous solution with addition of ethylene glycol as the solution modifier. The arrangement analysis method based on fast Fourier transforms was applied to characterize the porous arrays ordering. The quality, arrangement, circularity and regularity of nanoporous AAO formed on the low-purity (AA1050) and high-purity aluminum were investigated in details. It was found that the regularity of the nanopores ordering obtained on low-purity aluminum at applied experimental conditions was extraordinarily high while compared to the data published previously. The relation between the structural features of nanopores as well as aluminum concaves ordering obtained in two-step anodization process depending on the step of reaction, was analyzed. It was proven that purity of anodizing aluminum influence the interpore distance, wherein the purer aluminum the smaller interpore distance. The observed phenomenon was discussed in details in accordance with intrinsic mechanism. Furthermore, there are no simple relations between regularity ratio of obtained nanostructures and the step of anodizing.

show abstract

On The Generation of Interferometric Colors in High Purity and Technical Grade Aluminum: An Alternative Green Process for Metal Finishing Industry

Cited by 43 publications

References 45 publications

Realisation and advanced engineering of true optical rugate filters based on nanoporous anodic alumina by sinusoidal pulse anodisation

Realisation and advanced engineering of true optical rugate filters based on nanoporous anodic alumina by sinusoidal pulse anodisation

Rational engineering of nanoporous anodic alumina optical bandpass filters

Characterization of nanopores arrangement of anodic alumina layers synthesized on low-(AA1050) and high-purity aluminum by two-step anodizing in sulfuric acid with addition of ethylene glycol at low temperature

Contact Info

Product

Resources

About