scholarly journals Realization of high-quality optical nanoporous gradient-index filters by optimal combination of anodization conditions

Nanoscale ◽  
2020 ◽  
Vol 12 (17) ◽  
pp. 9404-9415 ◽  
Author(s):  
Cheryl Suwen Law ◽  
Siew Yee Lim ◽  
Lina Liu ◽  
Andrew D. Abell ◽  
Lluis F. Marsal ◽  
...  
Keyword(s):  
Anodic Alumina ◽  
Optimal Combination ◽  
Gradient Index ◽  
High Quality ◽  
Nanoporous Anodic Alumina

High-quality nanoporous anodic alumina gradient-index filters are realized by sinusoidal pulse anodization under optimized anodization conditions.

scholarly journals Stacked Nanoporous Anodic Alumina Gradient-Index Filters with Tunable Multispectral Photonic Stopbands as Sensing Platforms

2018 ◽  
Vol 11 (3) ◽  
pp. 3360-3371 ◽  
Author(s):  
Laura K. Acosta ◽  
Francesc Bertó-Roselló ◽  
Elisabet Xifre-Perez ◽  
Abel Santos ◽  
Josep Ferré-Borrull ◽  
...  
Keyword(s):  
Anodic Alumina ◽  
Gradient Index ◽  
Nanoporous Anodic Alumina ◽  
Sensing Platforms

Enhancing Forbidden Light Propagation in Nanoporous Anodic Alumina Gradient-Index Filters by Alcohol Additives

2020 ◽  
Vol 3 (12) ◽  
pp. 12115-12129
Author(s):  
Siew Yee Lim ◽  
Cheryl Suwen Law ◽  
Lin Jiang ◽  
Laura K. Acosta ◽  
Akash Bachhuka ◽  
...  
Keyword(s):  
Light Propagation ◽  
Anodic Alumina ◽  
Gradient Index ◽  
Nanoporous Anodic Alumina

Structural tailoring of nanoporous anodic alumina optical microcavities for enhanced resonant recirculation of light

Nanoscale ◽  
2018 ◽  
Vol 10 (29) ◽  
pp. 14139-14152 ◽  
Author(s):  
Cheryl Suwen Law ◽  
Siew Yee Lim ◽  
Andrew D. Abell ◽  
Lluís F. Marsal ◽  
Abel Santos
Keyword(s):  
Photonic Crystal ◽  
Structural Engineering ◽  
Anodic Alumina ◽  
High Quality ◽  
Nanoporous Anodic Alumina ◽  
Optical Microcavities

A study about the structural engineering of high quality nanoporous anodic alumina optical microcavities (NAA-μCVs) fabricated by rationally designed anodisation strategies to enhance the light-confining capabilities of these photonic crystal (PC) structures is presented.

scholarly journals Optical Platform to Analyze a Model Drug-Loading and Releasing Profile Based on Nanoporous Anodic Alumina Gradient Index Filters

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 730
Author(s):  
Pankaj Kapruwan ◽  
Laura K. Acosta ◽  
Josep Ferré-Borrull ◽  
Lluis F. Marsal
Keyword(s):  
Real Time ◽  
Drug Loading ◽  
Anodic Alumina ◽  
Gradient Index ◽  
Layer By Layer ◽  
Nanoporous Anodic Alumina ◽  
Layer Deposition ◽  
Model Drug ◽  
Surface Modified ◽  
Cargo Molecule

In this work, a methodology that exploits the optical properties of the nanoporous anodic alumina gradient index filters (NAA-GIFs) has been developed and applied to evaluate in real time the release dynamics of a cargo molecule, acting as a model drug, filling the pores. NAA-GIFs with two photonic stopbands (PSBs) were prepared with one of its stop bands in the same absorption wavelength range of the cargo molecule, whereas the second stopband away from this absorption range. Numerical simulation and experiments confirm that the relative height of the high reflectance bands in the reflectance spectra of NAA-GIFs filled with the drug can be related to the relative amount of drug filling the pores. This property has been applied in a flow cell setup to measure in real-time the release dynamics of NAA-GIFs with the inner pore surface modified by layer-by-layer deposition of polyelectrolytes and loaded with the cargo molecule. The methodology developed in this work acts as a tool for the study of drug delivery from porous nanostructures.

scholarly journals Engineering the Slow Photon Effect in Photoactive Nanoporous Anodic Alumina Gradient-Index Filters for Photocatalysis

2018 ◽  
Vol 10 (28) ◽  
pp. 24124-24136 ◽  
Author(s):  
Siew Yee Lim ◽  
Cheryl Suwen Law ◽  
Marijana Markovic ◽  
Jason K. Kirby ◽  
Andrew D. Abell ◽  
...  
Keyword(s):  
Anodic Alumina ◽  
Gradient Index ◽  
Nanoporous Anodic Alumina

Photoswitchable Membranes Based on Peptide‐Modified Nanoporous Anodic Alumina: Toward Smart Membranes for On‐Demand Molecular Transport

2015 ◽  
Vol 27 (19) ◽  
pp. 3019-3024 ◽  
Author(s):  
Tushar Kumeria ◽  
Jingxian Yu ◽  
Mohammed Alsawat ◽  
Mahaveer D. Kurkuri ◽  
Abel Santos ◽  
...  
Keyword(s):  
Molecular Transport ◽  
Anodic Alumina ◽  
Nanoporous Anodic Alumina ◽  
On Demand

New 8-oxo-7,8-2´deoxyguanosine nanoporous anodic alumina aptasensor for colorectal cancer diagnosis in blood and urine

Nanoscale ◽  
2021 ◽  
Author(s):  
Luis Pla ◽  
Felix Sancenón ◽  
M.Carmen Martinez-Bisbal ◽  
Celia Banuls ◽  
Nuria Estañ ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Colorectal Cancer ◽  
Cancer Diagnosis ◽  
Anodic Alumina ◽  
Human Diseases ◽  
Nanoporous Anodic Alumina

Many important human diseases, and specially cancer, have been related to the overproduction of 8-oxo-7,8-dihydro-2´-deoxyguanosine (8-oxo-dG). This molecule is a product of oxidative stress processes over nucleophilic bases in DNA....

Thin nanoporous anodic alumina film on aluminium for passive radiative cooling

Pramana ◽  
2021 ◽  
Vol 95 (1) ◽  
Author(s):  
Jitendra K Pradhan ◽  
Dheeraj Pratap ◽  
S Anantha Ramakrishna
Keyword(s):  
Anodic Alumina ◽  
Radiative Cooling ◽  
Alumina Film ◽  
Nanoporous Anodic Alumina ◽  
Anodic Alumina Film

scholarly journals Spatially Ordered Matrix of Nanostructured Tin–Tungsten Oxides Nanocomposites Formed by Ionic Layer Deposition for Gas Sensing

Sensors ◽  
2021 ◽  
Vol 21 (12) ◽  
pp. 4169
Author(s):  
Gennady Gorokh ◽  
Natalia Bogomazova ◽  
Abdelhafed Taleb ◽  
Valery Zhylinski ◽  
Timur Galkovsky ◽  
...  
Keyword(s):  
Tungsten Oxide ◽  
Gas Sensing ◽  
Oxide Films ◽  
High Sensitivity ◽  
Anodic Alumina ◽  
Film Deposition ◽  
Silicon Substrates ◽  
Layer By Layer ◽  
Gas Sensitivity ◽  
Nanoporous Anodic Alumina

The process of layer-by-layer ionic deposition of tin-tungsten oxide films on smooth silicon substrates and nanoporous anodic alumina matrices has been studied. To achieve the film deposition, solutions containing cationic SnF2 or SnCl2 and anionic Na2WO4 or (NH4)2O·WO3 precursors have been used. The effect of the solution compositions on the films deposition rates, morphology, composition, and properties was investigated. Possible mechanisms of tin-tungsten oxide films deposition into the pores and on the surface of anodic alumina are discussed. The electro-physical and gas-sensitive properties of nanostructured SnxWyOz films have been investigated. The prepared nanocomposites exhibit stable semiconductor properties characterized by high resistance and low temperature coefficient of electrical resistance of about 1.6 × 10−3 K−1. The sensitivity of the SnxWyOz films to 2 and 10 ppm concentrations of ammonia at 523 K was 0.35 and 1.17, respectively. At concentrations of 1 and 2 ppm of nitrogen dioxide, the sensitivity was 0.48 and 1.4, respectively, at a temperature of 473 K. At the temperature of 573 K, the sensitivity of 1.3 was obtained for 100 ppm of ethanol. The prepared nanostructured tin-tungsten oxide films showed promising gas-sensitivity, which makes them a good candidate for the manufacturing of gas sensors with high sensitivity and low power consumption.

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