Sol–gel entrapment of bromothymol blue (BTB) indicator in the presence of cationic 16E1Q and 16E1QS surfactants

El‐Nahhal, Issa M.; Zourab, Shehata M.; Kodeh, Fawzi S.; El-Salam, Fatma H. Abd; Baker, Sharbat A.

doi:10.1007/s10971-016-4044-x

Cited by 10 publications

(3 citation statements)

References 24 publications

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“…BTB could present in two forms: acidic form (yellow), with an absorption peak at 431 nm, and basic form (blue), with an absorption peak at 618 nm (Figure S4), owing to p−p* and n−p* transitions, respectively. 34,35 BTB-MGs in a neutral aqueous solution exhibit a color between yellow and blue, appearing green. The addition of Cr 3+ , Al 3+ , Fe 3+ , or Cu 2+ resulted in the loss of acid− base balance and acidity of the solution, thereby causing BTB to indicate yellowing.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Functionalized Ionic Microgel Sensor Array for Colorimetric Detection and Discrimination of Metal Ions

Zhou

Nie

2017

ACS Appl. Mater. Interfaces

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A functional ionic microgel sensor array was developed by using 1-(2-pyridinylazo)-2-naphthaleno (PAN)- and bromothymol blue (BTB)-functionalized ionic microgels, which were designed and synthesized by quaternization reaction and anion-exchange reaction, respectively. The PAN microgels (PAN-MG) and BTB microgels (BTB-MG) were spherical in shape with a narrow size distribution and exhibited characteristic colors in aqueous solution in the presence of various trace-metal ions, which could be visually distinguished by the naked eye. Such microgels could be used for the colorimetric detection of various metal ions in aqueous solution at submicromolar levels, which were lower than the U.S. Environmental Protection Agency standard for the safety limit of metal ions in drinking water. A total of 10 species of metal ions in aqueous solution, Ba, Cr, Mn, Pb, Fe, Co, Zn, Ni, Cu, and Al, were successfully discriminated by the as-constructed microgel sensor array combined with discriminant analysis, agglomerative hierarchical clustering, and leave-one-out cross-validation analysis.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Functionalized Ionic Microgel Sensor Array for Colorimetric Detection and Discrimination of Metal Ions

Zhou

Nie

2017

ACS Appl. Mater. Interfaces

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“…3,4 In particular, they are used in technologies for determining the acidity of natural waters [5][6][7] and soils, [8][9][10] and also form the basis of sensitive elements of fiber optic sensors or devices. [11][12][13][14][15] One of the most common areas of application is the use of bromine derivatives as analytical reagents, including the determination of components in biosamples and pharmaceuticals: antiviral, 16 antiseptic, 17,18 bactericidal, [19][20][21] antitumor, 22 antihypertensive, 23 antitussives 24,25 and others. [26][27][28][29] The effective use of 5,5′-dibromo-o-cresolsulfonphthalein (DBS) in the technologies of recent years is known.…”

Section: Introductionmentioning

confidence: 99%

Association of 5,5′-Dibromo-o-Cresolsulfonphthalein Anions with Dye Cations in Aqueous Solution

Шаповалов¹

2022

ChChT

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The formation of associates in aqueous solutions between single- or double-charged anions of 5,5′-dibromo-o-cresolsulfonphthaleine and single-charged cations of cyanine dyes (quinaldine blue, quinaldine red) has been considered. Based on the spectrophotometric data, the equilibrium constants of the association were analyzed. The energy of cation-anion interactions (standard enthalpy of formation of ions and associates) was determined by the semi-empirical AM1 method and probable structures of associates were set. The consistency between experimental spectrophotometric and calculated quantum chemical data is discussed.

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“…By measuring the variations in optical characteristics, the pH value of the solution can be determined. At present, the more commonly used indicator types are fluorescent acrylamide [ 13 ], thymol blue [ 14 ], cresol red [ 15 ], bromophenol blue [ 16 ], and chlorophenol red [ 17 ], and a new nanometer-based indicator is also under development. In general, the indicator should be immobilized on an organic carrier, such as a polymer, agarose, hydrogel, or cellulose, via methods including adsorption, chemical bonding, and the sol-gel method [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Optimization of Optical pH Sensor Based on Sol-Gel

Zhang

Zhou

2018

Sensors

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Making use of the sol-gel technique, an optical pH sensor was prepared, which was made from an organic carrier with four indictors including congo red, bromophenol blue, cresol red, and chlorophenol red, cross-linked by tetraethyl orthosilicate (TEOS) and cellulose acetate. The actual detection range of the optical pH sensor is 2.5–11.0. The optimal ratio of ethyl orthosilicate, absolute ethanol, deionized water, and hydrochloric acid in glue precursor of the sensor-sensitive membrane was explored. The orthogonal experiment was designed to optimize the dosage of cellulose acetate, N,N-dimethylformamide (DMF), indicator, hydrochloric acid, and precursor glue in preparing the sensor-sensitive membrane. The linearity, measurement accuracy, repeatability, stability, and response time of the prepared pH sensor were tested. The measurement results were analyzed using a support vector machine and linear regression. The experimental results show that the optical pH sensor has a measurement accuracy of up to 0.2 pH and better stability and repeatability than the traditional pH glass electrode.

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Sol–gel entrapment of bromothymol blue (BTB) indicator in the presence of cationic 16E1Q and 16E1QS surfactants

Cited by 10 publications

References 24 publications

Functionalized Ionic Microgel Sensor Array for Colorimetric Detection and Discrimination of Metal Ions

Functionalized Ionic Microgel Sensor Array for Colorimetric Detection and Discrimination of Metal Ions

Association of 5,5′-Dibromo-o-Cresolsulfonphthalein Anions with Dye Cations in Aqueous Solution

Preparation and Optimization of Optical pH Sensor Based on Sol-Gel

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