Optically improved aluminum oxide membrane through electroless Ni modification

Durtschi, Jacob D.; Erali, Maria; Herrmann, Mark G.; Elgort, Marc G.; Voelkerding, Karl V.; Smith, R.E.

doi:10.1016/j.memsci.2004.09.024

Cited by 8 publications

(11 citation statements)

References 14 publications

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“…This finding (no significant fluctuations of the Al concentration among different analyzed samples, or also no large increase with higher applied voltages) allows excluding the formation of metallic aluminum (i.e., Al 0 ) inclusions as a possible factor of the anodic alumina darkening. The support for this conclusion can also be found in the earlier report of Durtschi et al, where EDX-studies demonstrated moderate variations of the constituting elements concentrations (e.g., 33.0–37.8 at % for aluminum) in the cross-section of a single PAA sample [ 22 ]. It needs to be mentioned that Durtschi et al analyzed the composition of the commercial Anopore TM membranes (Whatman Inc.( Little Chalfont, UK)), which are initially colorless (whitish), and those authors needed an electroless deposition of nickel-boron nanoparticles into the pores for increasing filter optical absorption and obtaining a black PAA membrane.…”

Section: Resultssupporting

confidence: 73%

A Strategy towards Light-Absorbing Coatings Based on Optically Black Nanoporous Alumina with Tailored Disorder

Pashchanka

Cherkashinin

2021

Materials

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This work provides a conceptually new way of thinking about the light-absorbing mechanism in additive-free black porous anodic alumina (black PAA, or b-PAA) layers obtained via “burning” anodizing regime. The new insight into the controllable photonic effects in PAA allows the implementation of the optical blackening method based on the deliberate randomization of the initially well-ordered nanopore arrangement. The proposed black coloration mechanism rests solely on the destructive interference of light after its multiple scattering. Similar effects have been earlier considered for some natural or artificially created biomimetic structures (e.g., the so-called “moth eye effect”, or the coloration mechanism in the Neurothemis tullia dragonfly wings). Comprehensive analysis confirmed that the chemical composition of b-PAA has only a minor influence on the color changes and the optical density increase, and that the light-absorbing properties most likely result from the structural effects. The new functional 2D materials exhibit strong adhesion to aluminum surface, are cost-effective and suitable for application under harsh thermal or UV-light conditions. They are potentially useful for manufacturing of optical devices or heat-resistant coatings in aerospace technologies, as well as solid supports for biological filtration and fluorescence imaging.

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Section: Resultssupporting

confidence: 73%

A Strategy towards Light-Absorbing Coatings Based on Optically Black Nanoporous Alumina with Tailored Disorder

Pashchanka

Cherkashinin

2021

Materials

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“…AOM membrane filters (Anodisk, 0 . 2 ìm pore size, Whatman) were blackened via the electroless nickelization process patterned after that described previously (Durtschi et al, 2005) The blackening process deposits nickel nanoparticles of approximately 30-50 nm in diameter dispersed along the inner channel walls of the membranes. The final filters retain sample flow rates of the unaltered filters, and few if any nickel particles appear to be deposited on the top surface, on which bacteria are deposited and imaged.…”

Section: Methodsmentioning

confidence: 99%

“…Although not yet commercially available, a low-fluorescence, black AOM filter has been developed as described by Durtschi et al (2005). With its low fluorescence level, the black AOM is a good candidate for a filter-based fluorescence Gram stain.…”

Section: Introductionmentioning

confidence: 99%

Increased sensitivity of bacterial detection in cerebrospinal fluid by fluorescent staining on low-fluorescence membrane filters

Durtschi

Erali

Bromley

et al. 2005

Journal of Medical Microbiology

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A membrane-filter-based, fluorescent Gram stain method for bacterial detection in cerebrospinal fluid samples was developed and evaluated as a rapid, sensitive alternative to standard Gram stain protocols. A recently developed, modified version of the aluminium oxide membrane Anopore with low-fluorescence optical properties showed superior performance in this application. Other aspects of the fluorescent Gram stain system that were evaluated include membrane filter selection, strategies to reduce fluorescence fading and the effect of patient blood cells on bacterial detection in the fluorescently stained cerebrospinal fluid samples. The combination of the membrane filter's bacteria-concentrating ability and absolute retention along with high-contrast, fluorescent Gram discriminating dyes enabled rapid bacterial detection and Gram discrimination, with a 1-1 . 5 order of magnitude increase in the bacterial concentration limit of detection.

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“…The detected contamination level at the top (porous) side was higher than at the bottom (sealed with the barrier layer) side ( Figure 17 A). Durtschi et al examined commercial PAA membranes synthesized in H 3 PO 4 and also reported a non-uniform distribution of the impurity-related elements in the thickness of PAA [ 124 ]. The concentrations of phosphorus at the opposite surfaces of PAA and in the middle of the film cross-section varied by a factor of 3−4 (see the top image in Figure 17 B).…”

Section: Structure and Composition Of Paa Laminasmentioning

confidence: 99%

“…( C ) The results of thermogravimetric analysis (TGA) confirming the successful low-temperature in situ reduction of oxalate and sulfate contamination (approximately by a half) in PAA laminas synthesized using extremely diluted electrolyte solutions (down to 0.05 M) and mild anodizing voltages. Adapted with permissions from [ 57 , 123 , 124 , 125 ]. Copyright 2013 and 2020 American Chemical Society, 2005 Elsevier, and 1989 Nature.…”

Section: Figurementioning

confidence: 99%

Conceptual Progress for Explaining and Predicting Self-Organization on Anodized Aluminum Surfaces

Pashchanka

2021

Nanomaterials

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Over the past few years, researchers have made numerous breakthroughs in the field of aluminum anodizing and faced the problem of the lack of adequate theoretical models for the interpretation of some new experimental findings. For instance, spontaneously formed anodic alumina nanofibers and petal-like patterns, flower-like structures observed under AC anodizing conditions, and hierarchical pores whose diameters range from several nanometers to sub-millimeters could be explained neither by the classical field-assisted dissolution theory nor by the plastic flow model. In addition, difficulties arose in explaining the basic indicators of porous film growth, such as the nonlinear current–voltage characteristics of electrochemical cells or the evolution of hexagonal pore patterns at the early stages of anodizing experiments. Such a conceptual crisis resulted in new multidisciplinary investigations and the development of novel theoretical models, whose evolution is discussed at length in this review work. The particular focus of this paper is on the recently developed electroconvection-based theories that allowed making truly remarkable advances in understanding the porous anodic alumina formation process in the last 15 years. Some explanation of the synergy between electrode reactions and transport processes leading to self-organization is provided. Finally, future prospects for the synthesis of novel anodic architectures are discussed.

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Optically improved aluminum oxide membrane through electroless Ni modification

Cited by 8 publications

References 14 publications

A Strategy towards Light-Absorbing Coatings Based on Optically Black Nanoporous Alumina with Tailored Disorder

A Strategy towards Light-Absorbing Coatings Based on Optically Black Nanoporous Alumina with Tailored Disorder

Increased sensitivity of bacterial detection in cerebrospinal fluid by fluorescent staining on low-fluorescence membrane filters

Conceptual Progress for Explaining and Predicting Self-Organization on Anodized Aluminum Surfaces

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