Kinetics of methylene blue (MB) photocatalyzed reduction and dark regeneration in a colorimetric oxygen sensor

Ollis, David F.; Mills, Andrew; Lawrie, Katherine

doi:10.1016/j.apcatb.2015.11.011

Cited by 21 publications

(12 citation statements)

References 15 publications

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“…The sensor, in the form of 70 µm thick film, was produced by extrusion and changed from dark blue to grey when exposed to UV light. Similar sensors have been reported with variations of sensor components: sacrificial donors (glycerol, DL-threitol, tartaric acid, triethanolamine), photocatalyst (micro- or nanoparticulated TiO 2 ), supporting polymer (zein, cellulose, LDPE), dye (methylene blue, thionine) [8,9,10,11,12,13,14,15,16]. A scheme of the functioning process of the sensor is described in Section 3.2.…”

Section: Introductionsupporting

confidence: 63%

Chromatic Sensor to Determine Oxygen Presence for Applications in Intelligent Packaging

López‐Carballo

Muriel-Galet

Hernández‐Muñoz

et al. 2019

Sensors

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A chromatic sensor has been designed for the detection of oxygen in package headspace. The sensor is based on the redox change of methylene blue (MB) to its leuco form. Its formulation includes the pigment, glycerol, as a sacrificial electron donor, TiO2, as a photocatalyst and ethylene-vinyl alcohol copolymer (EVOH), as a structural polymer matrix. The final sensor design that allows its manufacture by conventional printing and laminating technologies consists of the sensing polymer matrix (MB-EVOH) sandwiched in a suitable transparent multilayer structure. The outer layers protect the sensor from the external atmosphere and allow visualization of the colour. The inner layer is sufficiently opaque to facilitate sensor reading from the outside, is thick enough to avoid direct contact with food (functional barrier), and is oxygen-permeable to expose the sensing material to the internal package atmosphere. In the absence of oxygen, the sensor becomes white by irradiation with halogen lamps in less than 60 s. All components are substances permitted for food contact except the pigment, but specific migration analysis showed no trace of migration thanks to the functional barrier included in the design.

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Section: Introductionsupporting

confidence: 63%

Chromatic Sensor to Determine Oxygen Presence for Applications in Intelligent Packaging

López‐Carballo

Muriel-Galet

Hernández‐Muñoz

et al. 2019

Sensors

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“…As a consequence, any proposed mechanism based on the above kinetic findings may be flawed, since the usually observed zero-order kinetics may actually arise from a distortion of the real kinetics of reaction (2), i.e. a 'kinetic disguise' [18] due to: (a) absorption of the incident UV light by the dye, in oxidised and reduced form, i.e. Dox and Dred, respectively, as it passes through the paii film and (b) competition for reaction with the photogenerated electrons on the photocatalytic film with Rz, by ambient O2 dissolved in the ink film.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of reduction of a resazurin-based photocatalytic activity ink

Mackenzie¹,

MacDonald²,

Mills

et al. 2017

Catalysis Today

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“…Typical changes in the main 1PA band are shown in Figure 5. As follows from the data analyses, photodecomposition of 1−3 in both solvents can be roughly described by first-order photoreactions 55 and no substantial evidence of nascent photoproducts were detected in the first 7 min of irradiation. The values of the corresponding photodecomposition quantum yields Φ ph were determined by the absorption method 46 and are presented in Table 1.…”

Section: ■ Introductionmentioning

confidence: 75%

Dual Emissive Multinuclear Iridium(III) Complexes in Solutions: Linear Photophysical Properties, Two-Photon Absorption Spectra, and Photostability

et al. 2018

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Linear steady-state and time-resolved spectroscopic properties, degenerate two-photon absorption (2PA) spectra, and photochemical stability of Ir III complexes TCQ[Ir III (ppz) 2 ] n , (TCQ = tricycloquinazoline; ppz = 1phenylpyrazole; n = 1 (1), n = 2 (2), and n = 3 (3)) are presented for liquid solutions. The analysis of the linear photophysical properties revealed the nature of the observed dual-component fluorescence−phosphorescence emission of 1−3 at room temperature. The values of 2PA cross sections were determined by open aperture Z-scans using a 1 kHz femtosecond laser system. The specific dependence of the 2PA efficiency on the number of ppz ligand units in 1−3 was determined. The quantum yields, Φ ph , for photochemical decomposition of TCQ[Ir III (ppz) 2 ] n complexes were obtained for the first time using the absorption method [Corredor, C. C.; et al. J. Photoch. Photobio. A 2006, 184, 105−112] with continuous wave laser irradiation, and the highest stability of Φ ph ≈ 4 × 10 −6 was shown for 2 in toluene.

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Kinetics of methylene blue (MB) photocatalyzed reduction and dark regeneration in a colorimetric oxygen sensor

Cited by 21 publications

References 15 publications

Chromatic Sensor to Determine Oxygen Presence for Applications in Intelligent Packaging

Chromatic Sensor to Determine Oxygen Presence for Applications in Intelligent Packaging

Kinetics of reduction of a resazurin-based photocatalytic activity ink

Dual Emissive Multinuclear Iridium(III) Complexes in Solutions: Linear Photophysical Properties, Two-Photon Absorption Spectra, and Photostability

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