Encapsulation of Phenolphthalein pH-Indicator into a Sol-Gel Matrix

El‐Nahhal, Issa M.; Zourab, Shehata M.; El‐Ashgar, Nizam M.

doi:10.1081/dis-100107757

Cited by 43 publications

(35 citation statements)

References 10 publications

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“…El-Nahhal and co-workers reported the immobilization of phenolphthalein in a sol-gel matrix for monitoring acid-base reactions. 4 Showing the industrial relevance of this approach, Frankel and co-workers published a patent based on the introduction of a pH indicator in a gel based corrosion sensing coating able to modify its colour as a Scheme 1 Generic chemistry of polyurethane and polyurea.…”

Section: Introductionmentioning

confidence: 99%

Active sensing coating for early detection of corrosion processes

et al. 2014

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A corrosion sensing coating based on specially developed polymeric microcapsules with a pH-indicator is reported. The synthesis of the microcapsules is designed in a way to ensure their optimal compatibility with the polyurethane protective coatings and to allow release of the indicator at higher pH values. The obtained polyurea microcapsules have a regular and microsized morphology and a loading content of 12 wt%. The developed sensing coating applied on aluminium and magnesium alloys is able to indicate initiation of corrosion processes through a pink coating coloration, as a result of local pH increase in the cathodic areas.

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Section: Introductionmentioning

confidence: 99%

Active sensing coating for early detection of corrosion processes

et al. 2014

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“…Important applications include high-performance elastomers, membranes, electrical insulators, water repellent sealants, adhesives, protective coatings, and hydraulic, heat transfer, and dielectric fluids [50,51]. They also find use in other important applications, such as, biomaterials [52][53][54][55][56][57], catalyst supports [40,[58][59][60], chromatography [61][62][63], extraction and uptake of metal ions from aqueous solutions [44][45][46][47][48]64] and encapsulation of organic compounds [65][66][67][68][69][70].…”

Section: Modification Methods Of Functionalized Polysiloxane Xerogelsmentioning

confidence: 99%

A review on polysiloxane-immobilized ligand systems: Synthesis, characterization and applications

El‐Nahhal¹,

El‐Ashgar²

2007

Journal of Organometallic Chemistry

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140

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“…The matrix stability can be controlled by controlling the particle size. Researchers faced the leaching problem when trying to immobilize the dyes into silicabased matrices [12][13][14], probably due to an increased tendency of cracking. To solve this issue, in this study, we propose two types of matrices, titania and silica-titania by sol-gel method at low temperature.…”

Section: Introductionmentioning

confidence: 99%

Sol–gel based optically active phenolphthalein encapsulated nanomatrices for sensing application

Islam

Bidin

Riaz

et al. 2016

J Sol-Gel Sci Technol

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In this work, synthesis and characterization of phenolphthalein-immobilized titania (T-phph) and silicatitania (ST-phph) nanomatrix is reported. The thin films are deposited by sol-gel method at low temperature. The effect of host-guest chemistry in matrices, on the surface structures, optical and sensing activity of the resultant thin films is studied. The phenolphthalein-immobilized fabricated nanoparticles/nanomatrices are analyzed by field emission scanning electron microscope, energy-dispersive X-ray spectroscopy, atomic-force microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, surface analysis, thermogravimetric analysis, and UV-Vis spectroscopy. Thermally stable and high surface area homogeneous nanoparticles, containing nanocrystalline anatase phase with low refractive index (1.58), low roughness (5.5 nm), and high transparency (95 %) are obtained for phenolphthalein-immobilized ST-phph nanomatrix. Moreover, smaller nanoparticles (56-121 nm) with good incorporation of dye and good response of sensing are obtained. The sensor response is optimized at pH 12 with 10.

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Encapsulation of Phenolphthalein pH-Indicator into a Sol-Gel Matrix

Cited by 43 publications

References 10 publications

Active sensing coating for early detection of corrosion processes

Active sensing coating for early detection of corrosion processes

A review on polysiloxane-immobilized ligand systems: Synthesis, characterization and applications

Sol–gel based optically active phenolphthalein encapsulated nanomatrices for sensing application

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