Halochromic Polymer Nanosensors for Simple Visual Detection of Local pH in Coatings

Theerasilp, Man; Crespy, Daniel

doi:10.1021/acs.nanolett.1c00620

Cited by 25 publications

(19 citation statements)

References 51 publications

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“…Thus, pH-sensitive dyes were employed for detecting corrosion and entrapped in micro- or nanoparticles ,,, and nanofibers . The change of pH value generated a significant change of color, ,− fluorescence intensity, or fluorescence resonance energy transfer . FITC is a dye displaying a pH-dependent fluorescence, which has a high fluorescence quantum yield (Φ 2 f = 0.93 at p K a 6.43) in aqueous solution (see Figure S1a).…”

Section: Resultsmentioning

confidence: 99%

“…In addition, an interesting feature to be introduced in coatings for anticorrosion is corrosion sensing so that metallic structures can be replaced before critical damage. , This has been achieved by encapsulating various dyes in particles ,,,− or fibers that were subsequently embedded in coatings. The coatings displayed then a change of color or an increase/decrease in fluorescence intensity upon change of pH value or the presence of metal ions as a consequence of the corrosion process.…”

Section: Introductionmentioning

confidence: 99%

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Design of Nanostructured Protective Coatings with a Sensing Function

Salaluk

Jiang

Viyanit

et al. 2021

ACS Appl. Mater. Interfaces

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Nanostructured multilayered coatings for metals are prepared to simultaneously provide a function of corrosion mitigation and of corrosion sensing for copper substrates. Silica nanocapsules, embedded in one layer of the coating, are used as a host for a corrosion inhibitor and as a sensor, which detect changes of pH value and release inhibitors via an optical signal. Furthermore, another layer in the coating exists in a nanonetwork loaded with another corrosion inhibitor, which is impregnated with a hydrophobic polymer. We demonstrate that a specific arrangement of layers leads to an optimum anticorrosion and sensing performance while the sensing signal can be prolonged for a long time. It is the first time that the fluorophore detecting corrosion is conjugated to the nanosensor and that nanofibers and nanocapsules are used simultaneously to load and release corrosion inhibitors for anticorrosion applications.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design of Nanostructured Protective Coatings with a Sensing Function

Salaluk

Jiang

Viyanit

et al. 2021

ACS Appl. Mater. Interfaces

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“… 35 Thus, Ru(dppip-NO 2 ) might serve as an active WOC capable of additionally reporting the local pH value in, e.g., polymeric materials. 36 , 37 …”

Section: Discussionmentioning

confidence: 99%

A Ruthenium(II) Water Oxidation Catalyst Containing a pH-Responsive Ligand Framework

et al. 2021

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The synthesis of a new Ru II -based water oxidation catalyst is presented, in which a nitrophenyl group is introduced into the backbone of dpp via a pH-sensitive imidazole bridge (dpp = 2,9-di-(2′-pyridyl)-1,10-phenanthroline). This modification had a pronounced effect on the photophysical properties and led to the appearance of a significant absorption band around 441 nm in the UV–vis spectrum upon formation of the monoprotonated species under neutral conditions. Theoretical investigations could show that the main contributions to this band arise from transitions involving the imidazole and nitrophenyl motif, allowing us to determine the p K a value (6.8 ± 0.1) of the corresponding, twofold protonated conjugated acid. In contrast, the influence of the nitrophenyl group on the electrochemical properties of the catalytic center was negligible. Likewise, the catalytic performance of Ru(dppip-NO 2 ) and its parent complex Ru(dpp) was comparable over the entire investigated pH range (dppip-NO 2 = 2-(4-nitrophenyl)-6,9-di(pyridin-2-yl)-1 H -imidazo[4,5- f ][1,10]phenanthroline). This allowed the original catalytic properties to be retained while additionally featuring a functionalized ligand scaffold, which provides further modification opportunities as well as the ability to report the pH of the catalytic solution via UV–vis spectroscopy.

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“…Over the last few decades, scientists have been working on rewritable paper. Based on molecules and materials that show color change under external stimuli, rewritable paper or materials can be reversibly written and erased under control of pH, − heat, − light, − electricity, − oxidant/reductant, solvents, and mechanical force. − Therefore, recycling of rewritable paper skips the refabrication from pulp and is environmentally friendly and energy efficient.…”

Section: Introductionmentioning

confidence: 99%

Designing of Rewritable Paper by Hydrochromic Donor–Acceptor Stenhouse Adducts

et al. 2021

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Rewritable paper is meaningful to the recyclable and sustainable utilization of environmental resources and thus has been extensively investigated for several decades. In this work, we demonstrated an efficient and convenient strategy to fabricate rewritable paper based on reversible hydrochromism of donor−acceptor Stenhouse adducts (DASAs). The kinetics and efficiency of isomerization could be well-controlled by adjusting the surrounding temperature and humidity. Monocolored rewritable paper was prepared by coating cyclic DASA• xH 2 O on the paper surface. Writing, printing, stamping and patterning were realized on the rewritable paper. The information could be controllably erased by treatment in a humid atmosphere. More importantly, the rewritable paper was upgraded to multicolored by combination of two DASA materials. The color of chirography was switched by controlling the writing speed.

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Halochromic Polymer Nanosensors for Simple Visual Detection of Local pH in Coatings

Cited by 25 publications

References 51 publications

Design of Nanostructured Protective Coatings with a Sensing Function

Design of Nanostructured Protective Coatings with a Sensing Function

A Ruthenium(II) Water Oxidation Catalyst Containing a pH-Responsive Ligand Framework

Designing of Rewritable Paper by Hydrochromic Donor–Acceptor Stenhouse Adducts

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