Duplex nanoporous alumina and polyelectrolyte adsorption: more insights from a combined neutron reflectivity and electron microscopy study

Christoulaki, Anastasia; Chennevière, Alexis; Dubois, Emmanuelle; Jouault, Nicolas

doi:10.1039/c8nr09018a

Cited by 7 publications

(6 citation statements)

References 28 publications

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“…The remaining skeleton oxide in gray corresponds to the bulk in the model. because of the chemical etching during the AAO synthesis (Lee & Park, 2014;Christoulaki et al, 2019). The data fitting was performed using the SasView software (SAS, http:// www.sasview.org/) with homemade programs.…”

Section: Full Sans Interpretation: Fitting Strategymentioning

confidence: 99%

A novel methodology to study nanoporous alumina by small-angle neutron scattering

et al. 2019

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Nanoporous anodic aluminium oxide (AAO) membranes are promising host systems for confinement of condensed matter. Characterizing their structure and composition is thus of primary importance for studying the behavior of confined objects. Here a novel methodology to extract quantitative information on the structure and composition of well defined AAO membranes by combining small-angle neutron scattering (SANS) measurements and scanning electron microscopy (SEM) imaging is reported. In particular, (i) information about the pore hexagonal arrangement is extracted from SEM analysis, (ii) the best SANS experimental conditions to perform reliable measurements are determined and (iii) a detailed fitting method is proposed, in which the probed length in the fitting model is a critical parameter related to the longitudinal pore ordering. Finally, to validate this strategy, it is applied to characterize AAOs prepared under different conditions and it is shown that the experimental SANS data can be fully reproduced by a core/shell model, indicating the existence of a contaminated shell. This original approach, based on a detailed and complete description of the SANS data, can be applied to a variety of confining media and will allow the further investigation of condensed matter under confinement.

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Section: Full Sans Interpretation: Fitting Strategymentioning

confidence: 99%

A novel methodology to study nanoporous alumina by small-angle neutron scattering

et al. 2019

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“…The protein distribution on and in nanoporous materials is thus an important subject to be clarified, and in-situ spectroscopic techniques for protein adsorption have been developed. [4][5][6][7][8][9][10][11][12][13][14][15][16][17] The distribution of adsorbate on a single nanoporous particle has been often observed by microspectroscopy techniques. 4,5 For a nanoporous film on a solid substrate, spectroscopic methods utilizing optical interference [6][7][8][9][10][11][12][13][14] and waveguide mode [15][16][17] are available for the in-situ observation of the molecular adsorption.…”

Section: Introductionmentioning

confidence: 99%

“…In-situ neutron reflectometry (NR) is one useful technique for structural characterization of an adsorption layer at a solid/ liquid interface. [11][12][13][14] The scattering length densities (SLD) of D2O and H2O are quite different (Table 1), and SLD contrast between materials within the nanoporous film and solvent can be easily tuned by adjusting solvent composition of a D2O/H2O mixture. When NR measurement is performed under a series of D2O/H2O mixtures, simultaneous analysis of reflectivity data obtained for the D2O/H2O mixtures can reduce ambiguities while modeling, and facilitates determination of the structural properties of the adsorption layer.…”

Section: Introductionmentioning

confidence: 99%

“…18 The in-situ NR has been applied to characterize lipid membranes assembled at a surfactant-templated mesoporous silica film 12,13 and adsorption of polyelectrolyte at an anodized nanoporous aluminum oxide film. 14 The purpose of this study is application of in-situ NR to clarify whether negatively-charged glucose oxidase (GOD) can penetrate into pores in mesoporous aluminum oxide (MAO) film or not. The MAO film used in this study was prepared by a surfactant-templated method, 19 and contained ordered pores with diameter of ca.…”

Section: Introductionmentioning

confidence: 99%

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In-situ Neutron Reflectometry Study on Adsorption of Glucose Oxidase at Mesoporous Aluminum Oxide Film

2020

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In the present study, the adsorption of glucose oxidase (GOD) to a mesoporous aluminum oxide (MAO) film was examined with in-situ neutron reflectometry (NR) measurements. The MAO film was deposited on a cover glass slip and a Si disc, and its pore structure was characterized by X-ray reflectometry (XRR) and NR. The Si disc with MAO film was applied for an in-situ NR experiment, and its NR profiles before/after adsorption of GOD were continuously measured with a flow cell. The results indicated that the negatively-charged GOD molecules hardly penetrate into the narrow pore channel (pore diameter = ca. 10 nm) with opposite surface charge.

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“…The genesis of this was attributed to several reasons. One of the reasons was the mechanical stress pushing the alumina barrier layer upward and inducing the inversion in curvature [104,107]. The other reason suggested was the dissolution of alumina owing to the local temperature rise [108] or oxygen bubble formation [105].…”

Section: Pore Wall and Barrier Layer Thicknessmentioning

confidence: 99%

Recent Progress in the Fabrication and Optical Properties of Nanoporous Anodic Alumina

et al. 2022

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The fabrication of a thick oxide layer onto an aluminum surface via anodization has been a subject of intense research activity for more than a century, largely due to protective and decorative applications. The capability to create well-defined pores via a cost-effective electrochemical oxidation technique onto the surface has made a major renaissance in the field, as the porous surfaces exhibit remarkably different properties compared to a bulk oxide layer. Amongst the various nanoporous structures being investigated, nanoporous anodic alumina (NAA) with well-organized and highly ordered hexagonal honeycomb-like pores has emerged as the most popular nanomaterial due to its wide range of applications, ranging from corrosion resistance to bacterial repelling surfaces. As compared to conventional nanostructure fabrication, the electrochemical anodization route of NAA with well-controlled pore parameters offers an economical route for fabricating nanoscale materials. The review comprehensively reflects the progress made in the fabrication route of NAA to obtain the material with desired pore properties, with a special emphasis on self-organization and pore growth kinetics. Detailed accounts of the various conditions that can play an important role in pore growth kinetics and pore parameters are presented. Further, recent developments in the field of controlling optical properties of NAA are discussed. A critical outlook on the future trends of the fabrication of NAA and its optical properties on the emerging nanomaterials, sensors, and devices are also outlined.

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Duplex nanoporous alumina and polyelectrolyte adsorption: more insights from a combined neutron reflectivity and electron microscopy study

Abstract: We demonstrate that neutron reflectivity is a powerful technique to characterize duplex nanoporous alumina membranes and to quantify the behavior of confined polyelectrolytes.

Cited by 7 publications

References 28 publications

A novel methodology to study nanoporous alumina by small-angle neutron scattering

A novel methodology to study nanoporous alumina by small-angle neutron scattering

In-situ Neutron Reflectometry Study on Adsorption of Glucose Oxidase at Mesoporous Aluminum Oxide Film

Recent Progress in the Fabrication and Optical Properties of Nanoporous Anodic Alumina

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