UV-sensitive indicators based on bromophenol blue and chloral hydrate dyed poly(vinyl butyral)

Abdel-Fattah, A.A.; El-Kelany, M.; Abdel-Rehim, F.; Miligy, A. A. El

doi:10.1016/s1010-6030(97)00195-0

Cited by 28 publications

(12 citation statements)

References 13 publications

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“…Distinctively, the introduction of TTF moieties in compound 2 caused a bathochromic shift of 31 nm, compared to compound 1. This could be explained as intramolecular charge transfer between relatively electron-deficient fluorene and electron-rich TTF [18][19][20]. As for P1-P2, they displayed wider absorptions than their components due to the combined systems.…”

Section: Resultsmentioning

confidence: 97%

Fluorescent switch based on the oxidation of tetrathiafulvalene

et al. 2015

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Two copolymers (P1 and P2), bearing 3,4-ethylenedioxythiophene and fluorene moieties, were synthesized via Sonogashira coupling reaction successfully and P2 contains additional tetrathiafulvalene derivatives (TTFs) as pendants. The structures and properties of copolymer P1 and P2 were investigated by Infrared spectra, UV-visible spectra, and fluorescence spectra. Spectra analyses revealed that the fluorescent intensity of P2 was only 2 % compared to that of P1 in solution. The quenched fluorescent intensity of P2 could be recovered after adding defined moles of Fe(ClO 4 ) 3 as an oxidant. The phenomenon was discussed with aid of computational stimulation in Gaussian 03. Herein, it is believed that intramolecular charge transfer occurs between TTF pendants and polymeric backbone in P2. P2 could be treated as a reporting group in fluorescent testing/switching system. Graphical abstract& Yongjia Shen

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Section: Resultsmentioning

confidence: 97%

Fluorescent switch based on the oxidation of tetrathiafulvalene

et al. 2015

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“…Dosimeter ini berubah warnanya dari biru ke hijau dan akhirnya ke kuning setelah diradiasi sinar UV. Warna biru pada bromophenol blue menunjukkan sifat basa dan warna kuning menunjukkan sifat asam dengan dosis tertinggi sampai 9 kGy, dengan pita absorpsi maksimum pada panjang gelombang 421 dan 601 nm dengan menggunakan alat spektrofotometri [6].…”

Section: Pendahuluanunclassified

Serapan Optik Polimer Film Pva-Tca-Mb Yang Diradiasi Sinar Gamma

Verawati¹

2012

J. Pijar MIPA

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Abstrak : Pengaruh radiasi sinar gamma terhadap sifat optik dari poli vinil alkohol (PVA) yang dicampur dengan trichloro acetid acid (TCA) dan pewarna methilen blue (MB) dapat digunakan pada dosimetri dan pengukuran dosis radiasi sinar gamma telah dipelajari dengan menggunakan metode spektrofotometer. dosimeter telah diradiasi sampai dosis 14 kGy dengan menggunakan sinar gamma 60 Co. Polimer film mengalami perubahan warna dari biru keunguan ke kuning akibat radiasi sinar gamma. Perubahan warna ini mengindikasikan terbentuknya asam kuat, dengan kenaikan dosis radiasi banyak ion klorin putus dari rantai karbon TCA dan akibat radiasi menyebabkan ion H + dan OH -menjadi radikal bebas yang dihasilkan dari proses hidrolisis air dari molekul sampel, kemudian berkombinasi dalam bentuk asam. spektrum serapan telah diukur menggunakan spektrofotometer UvVis pada rentang panjang gelombang 200-700 nm, menghasilkan penurunan serapan pada puncak 360 dan 440 nm dengan peningkatan dosis dan kenaikan serapan optik pada puncak 560 nm dengan kenaikan dosis radiasi.Kata kunci: Sifat optik, radiasi sinar gamma, polimer film PVA-TCA-MB, spektrum serapan optik Abstract :The effect of gamma irradiation on optical properties of methylene-blue dyed poly vinyl alcohol (PVA) blended with trichloroacetid acid (TCA) for use in dosimetry and measurement of radiation dose in gamma rays have been studied using Uv-Visible spectrophotometer method. The dosimeters were irradiated for doses up 14 kGy using 60 Co gamma rays source at a constant dose rate. The polymeric films undergo colour change from blue purplish to yellow due to radiation-induced. The changes of this colour indicated strong acid, by the increasing of radiation dose caused more chlorine ions break from carbon of TCA and radiation-induced H + and OH -free radicals are generated from the hydrolysis of water molecules, they then combined to form acid. The absorption spectra were measured using Uv-Visible spectrophotometer in the wavelength range 200-700 nm, resulting in a decrease of the absorbance at 360 and 440 nm band peak with increasing dose and an increases of the absorbance at 560 nm band peak with increasing dose.

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“…Many studies on the fabrication and dosimetric characteristics of dyed polymer films have been reported. For example, Abdel-Fattah et al described the fabrication and evaluation of various dyed polymer films for UV monitoring [2][3][4][5][6][7]. They mainly used polyvinyl alcohol (PVA) as a matrix of UV-responsible dyes.…”

Section: Introductionmentioning

confidence: 99%

Photometric Characteristics of Aqueous Solutions and Polymer Films Containing Bromothymol Blue/Diphenyliodonium Salts Applied for UV Monitoring

Takada

Uchino

Suda

et al. 2015

e-J. Surf. Sci. Nanotech.

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We examined the photometric characteristics of ultraviolet light (UV) measurements of aqueous solution and polyvinyl alcohol (PVA) film containing bromothymol blue (BTB) and diphenyliodonium salts (chloride, nitrate and trifluoromethane sulfonate). The solution and film were initially green (neutral), but were changed to yellow (acidic) by irradiation with 254 nm UV from a mercury lamp. A solution and film containing only BTB did not show the color change, which we concluded was solely induced by the acid generation from the diphenyliodonium salts. Photochemical kinetics of the UV-induced color change are discussed on the basis of experimental results; the color change proceeded obviously according to pseudo-first-order kinetics. This BTB/diphenyliodonium salt system could be used as a low-cost, mobile UV dosimeter.

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UV-sensitive indicators based on bromophenol blue and chloral hydrate dyed poly(vinyl butyral)

Cited by 28 publications

References 13 publications

Fluorescent switch based on the oxidation of tetrathiafulvalene

Fluorescent switch based on the oxidation of tetrathiafulvalene

Serapan Optik Polimer Film Pva-Tca-Mb Yang Diradiasi Sinar Gamma

Photometric Characteristics of Aqueous Solutions and Polymer Films Containing Bromothymol Blue/Diphenyliodonium Salts Applied for UV Monitoring

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