Measuring Active Oxygen Species Across a Nonwoven Fabric Using a Pullulan-mixed Methylene Blue Thin Film and Electron Spin Resonance

Yenchit, Saranya; Tadokoro, Yuta; Iwamori, Satoru

doi:10.1541/ieejsmas.139.54

Cited by 8 publications

(7 citation statements)

References 18 publications

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“…We have already discussed the model of OH * production by O 3 and water inside the nonwoven fabric. 42) In addition, an OH * formation reaction by O 3 and water has already been reported. The autolysis reaction of the O 3 under water is as follows: Therefore, O 3 is decomposed into oxygen molecules and OH * radicals are generated in the process.…”

Section: Discussionmentioning

confidence: 93%

Chemical stability of a colorimetric indicator based on sodium alginate thin film and methylene blue dye upon active oxygen species exposure

Yenchit

Yamanaka

Temeeprasertkij

et al. 2020

Jpn. J. Appl. Phys.

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Active oxygen species (AOS) generated in the atmosphere can be applied in various industrial processes owing to their extremely strong oxidative ability. Methylene blue (MB) decolors upon exposure to AOS owing to dye degradation; this property can be used to detect the AOS. To detect AOS with higher oxidative ability, it is necessary to stabilize MB by mixing it with sodium alginate. In our previous work, we showed that the OH* concentration in the AOS increased under the high-humidity condition. Herein, the decolorization mechanism of MB-dyed sodium alginate thin films upon exposure to AOS was elucidated under low- and high-humidity conditions; decolorization was observed only under the latter. We analyzed an MB-dyed sodium alginate thin film indicator to elucidate the chemical reactions occurring as well as the decolorization mechanism generated under the high-humidity condition. We found that the decolorization of the film was caused by MB decomposition upon exposure to the AOS generated under the high-humidity condition.

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Section: Discussionmentioning

confidence: 93%

Chemical stability of a colorimetric indicator based on sodium alginate thin film and methylene blue dye upon active oxygen species exposure

Yenchit

Yamanaka

Temeeprasertkij

et al. 2020

Jpn. J. Appl. Phys.

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“…In a previous study, we examined the chemical reactions and decolorization mechanism associated with the exposure of the optimized MB-pullulan structures to OH* [15][16][17][18]. We show the results that provided insight into possible interaction modes that allow AOS detection under various conditions.…”

Section: Discussionmentioning

confidence: 93%

Molecular Interactions between Methylene Blue and Sodium Alginate Studied by Molecular Orbital Calculations

2021

Self Cite

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A methylene blue (MB) indicator embedded in sodium alginate (SA) film was previously examined for detecting active oxygen species. In a previous study, spectrometry was used to identify and characterize the MB/SA complex. However, the decolorization mechanism was not fully assessed. In this study, our aim is to conduct computational calculations at the B3LYP/6-31G(d) level to clarify the exact types and positions of the interaction that cause the decolorization in MB. The results demonstrate that MB/SA interacts with carboxylates (-COO(superscript)-(superscript)) of SA and the N, C, and S atoms of MB, confirming previous experimental observations.

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“…Pullulan is characterized by its ability to absorb water in addition to excellent adhesive properties that give it e ciency in the formulation of membranes and bers. It is used in various elds such as agriculture, the food industry [7], pharmaceuticals [8], and textiles [9]. Pullulan consists of repeated α-(1,6) maltotriose units) via α- (1,4) glycosidic bonds and has the chemical formula (C6H10O5)n [10].…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Hydrogel Adsorption/Desorption with and without Surfactants

Dhahir,

Braihi,

Habeeb

2024

Preprint

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In this study, the hydrogel (SAP-1) was prepared by grafting acrylic acid-co-acrylamide onto pullulan (Pul-g-Poly (acrylic acid-co-acrylamide)) and the sponge hydrogel (SAP-2) was prepared by adding the surfactant sodium dodecyl benzene. sulfonate (SDBS) by free radical solution polymerization. Several properties were used to determine the efficiency of the prepared hydrogels such as Fourier transform infrared spectroscopy, hydrogen nuclear magnetic resonance (1H NMR), atomic absorption spectroscopy, and field emission scanning electron microscopy (FE-SEM) to further understand the composition and properties of the hydrogels. On the other hand, the absorption kinetics were studied and analyzed with the experimental equilibrium capacities of the prepared hydrogels were determined. The results demonstrated that each of the prepared hydrogels is an effective adsorbent of cadmium (II), copper (II), and nickel (II) ions. SAP-2 gel is characterized by its high ability to absorb cadmium (II) ions at a rate of 190.72 mg/g, followed by SAP-1 gel for absorbing cadmium (II) ions at a rate of 146.9 mg/g and copper (II) ions at a rate of 154 mg/g. The hydrogel (SAP- 2) with its high ability to repeat the adsorption-absorption cycles 3 times for cadmium (II) ions, the absorption capacities were 190.72 mg/g, 100.43 mg/g, and 19.64 mg/g at first, second, and third cycles, respectively. Based on the above results, all the prepared hydrogels are good candidates for adsorption and desorption of cadmium (II), copper (II), and nickel (II) ions.

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Measuring Active Oxygen Species Across a Nonwoven Fabric Using a Pullulan-mixed Methylene Blue Thin Film and Electron Spin Resonance

Cited by 8 publications

References 18 publications

Chemical stability of a colorimetric indicator based on sodium alginate thin film and methylene blue dye upon active oxygen species exposure

Chemical stability of a colorimetric indicator based on sodium alginate thin film and methylene blue dye upon active oxygen species exposure

Molecular Interactions between Methylene Blue and Sodium Alginate Studied by Molecular Orbital Calculations

Comparative Analysis of Hydrogel Adsorption/Desorption with and without Surfactants

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