Leaching in sol–gel-derived silica films for optical pH sensing

Butler, Thomas M.; MacCraith, Brian D.; McDonagh, Colette

doi:10.1016/s0022-3093(97)00481-x

Cited by 118 publications

(68 citation statements)

References 18 publications

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“…Since the first two factors are constants for a thin film when fabricated the only factor that may depend on the pH of the surrounding solution is the solubility of the dye in different pH environments. Similar results were observed by Butler et al [14] for another pH indicator dye, bromophenol blue, in a sol-gel matrix. From this it can be inferred that the leaching of the dye is significant at higher pH.…”

Section: Resultssupporting

confidence: 89%

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A sensitive fibre optic pH sensor using multiple sol-gel coatings

Lee

Gin

Nampoori

et al. 2001

J. Opt. A: Pure Appl. Opt.

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The fabrication and characterization of a fibre optic pH sensor based on evanescent wave absorption is presented. The unclad portion of a multi-mode optical fibre is coated with a pH sensitive dye, which is immobilized by the sol-gel route. The sensitivity of the device has been found to increase when multiple sol-gel coatings are used as the sensing region. The dynamic range and the temporal response of the sensor are investigated for two different dyes, namely bromocresol purple and bromocresol green. The performance of the device is evaluated in terms of the results obtained during actual measurements.

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Section: Resultssupporting

confidence: 89%

“…A 50 W tungsten halogen lamp with a monochromator (McPherson UV 275) and PMT (Oriel) are used to record the EW absorption spectrum of the FOS [14]. The experimental set-up used to calibrate the pH sensor is shown in figure 1.…”

Section: The Experimental Set-upmentioning

confidence: 99%

A sensitive fibre optic pH sensor using multiple sol-gel coatings

Lee

Gin

Nampoori

et al. 2001

J. Opt. A: Pure Appl. Opt.

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“…with H 2 O). Butler et al [25], showed that with lower value of water content, a matrix with amore open structure is produced due toincomplete hydrolysis and, consequently,less cross linking in the sol-gel material. A low water content or high dilution with alcohols (solvents) can lead to a high content of oligomers (soluble or volatile) and adecrease in the yield of SiO 2 .…”

Section: Discussionmentioning

confidence: 99%

Nano-Magnetodielectric Composite Based Substrate for Use in Microwave Planar Devices in X-Band

Phukan¹

2017

IJRET

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“…Optical pH sensors utilizing bromophenol blue as indicator in a sol gel film have been previously reported [25,26]. To find a sol-gel formulation for optical pH measurement of miniscule tear fluid samples with adequate stability and short response time [26][27][28] we tested 12 sol formulations in combination with 2 curing temperatures and 2 curing time periods.…”

Section: Bromophenol Blue Loaded Ph Sensitive Sol-gel Filmsmentioning

confidence: 99%

“…The leakage of bromophenol blue (BPB) was large from sol formulations 1 through 4 [25]. Increasing the phenyltriethoxysilane (PhTEOS) content of the sols and the curing temperature reduced the leaching.…”

Section: Ph Sensitive Sol-gel Film In Capillary Tubesmentioning

confidence: 99%

Ion‐Selective Optodes in a Sampling Capillary for Tear Fluid Analysis

Lindner¹,

Bordelon²,

Kim³

et al. 2011

Electroanalysis

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Plasticized PVC membrane-based potassium or sodium ion-selective optodes were incorporated into sampling capillaries in combination with sol-gel-based hydrogen ion-selective optodes for the sampling and analysis of minute tear fluid samples. The performance characteristic of the K + /pH and Na + /pH sensor arrays were optimized for an adequate dynamic response range, sensitivity, stability, and response time. The precision and accuracy of the combined sampling/measurement system was evaluated both in stopped flow and continuous flow modes using aqueous standard solutions. By using a two point calibration protocol, with pH standards bracketing the sample, the pH of 20 mL pooled human tear samples could be determined with a precision less than AE 0.03 pH units. Errors in the pH measurements have a significant influence on the attainable precision and accuracy of the ion-exchange-based K + and Na + optodes. Nevertheless, the results of the quantitative assessment of the K + and Na + concentrations in "check" standards and pooled human tear fluid samples were within AE 5 % of the nominal values or of the results of the determinations with atomic absorption spectrophotometry. Cationic surfactants in artificial tear drops were found to interfere with the K + and Na + optode responses. No interference was detected in the presence of anionic and nonionic surfactants.

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Leaching in sol–gel-derived silica films for optical pH sensing

Cited by 118 publications

References 18 publications

A sensitive fibre optic pH sensor using multiple sol-gel coatings

A sensitive fibre optic pH sensor using multiple sol-gel coatings

Nano-Magnetodielectric Composite Based Substrate for Use in Microwave Planar Devices in X-Band

Ion‐Selective Optodes in a Sampling Capillary for Tear Fluid Analysis

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