Exploitation of a pH-sensitive hydrogel disk for CO2 detection

Herber, S.; Olthuis, Wouter; Bergveld, Piet; Berg, Albert van den

doi:10.1016/j.snb.2004.04.113

Cited by 52 publications

(42 citation statements)

References 14 publications

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“…It can be used to prepare a stimulus-sensitive material, capable of detecting, for example, pH, temperature, pressure, stress, ionic strength, electric field and light [20,21]. Such gels have been used in various applications including tissue engineering, drug delivery systems or biomedical engineering.…”

Section: Introductionmentioning

confidence: 99%

“…Such gels have been used in various applications including tissue engineering, drug delivery systems or biomedical engineering. It has been applied as a sensor by using a transducer to convert the swelling of the hydrogel to an optical or electrical output [21,22] and used for pollutant sorption of dyes [18] and uranyl ions [23] by being blended with other materials.…”

Section: Introductionmentioning

confidence: 99%

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A cost effective hydrogel test kit for pre and post blast trinitrotoluene

Choodum

Malathong

NicDaéid

et al. 2016

Forensic Science International

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General rightsCopyright and moral rights for the publications made accessible in Discovery Research Portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from Discovery Research Portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain.• You may freely distribute the URL identifying the publication in the public portal. Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. ABSTRACTA cost effective hydrogel test kit was successfully developed for the detection of pre-and post-blast trinitrotoluene (TNT). A polyvinyl alcohol (PVA) hydrogel matrix was used to entrap the potassium hydroxide (KOH) colourimetric reagent. The easily portable test kit was fabricated in-situ in a small tube to which the sample could be added directly. The test kit was used in conjunction with digital image colourimetry (DIC) to demonstrate the rapid quantitative analysis of TNT in a test soil sample. The built-in digital camera of an iPhone was used to capture digital images of the colourimetric products from the test kit. Red-Green-Blue (RGB) colour data from the digital images of TNT standard solutions were used to establish a calibration graph. The validation of the DIC method indicated excellent inter day precision (0.12-3.60%RSD) and accuracy (93-108% relative accuracy). Post-blast soil samples containing TNT were analysed using the test kit and were in good agreement with spectrophotometric analysis. The intensity of the RGB data from the TNT complex deviated by +6.3%, +5.1%, and -4.9% after storage of the test kits in a freezer for 3 months. The test kit was also reusable for up to 12 times with only -5.4%, +0.3%, and +4.0% deviations. The hydrogel test kit was applied in the detection of trace explosive residues at the scene of the recent Bangkok bombing at the Ratchaprasong intersection and produced positive results for TNT demonstrating its operational field application as a rapid and cost effective quantitative tool for explosive residue analysis.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A cost effective hydrogel test kit for pre and post blast trinitrotoluene

Choodum

Malathong

NicDaéid

et al. 2016

Forensic Science International

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“…The use of a thin hydrogel layer instead of fast swelling microspheres was a deliberate choice. Preliminary research learned that hydrogel microspheres are difficult to handle and give unreliable responses compared to a thin hydrogel layer (Herber et al, , 2004a.…”

Section: Introductionmentioning

confidence: 99%

A Miniaturized Carbon Dioxide Gas Sensor Based on Sensing of pH-Sensitive Hydrogel Swelling with a Pressure Sensor

Herber

Bomer

Olthuis

et al. 2005

Biomed Microdevices

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A measurement concept has been realized for the detection of carbon dioxide, where the CO(2) induced pressure generation by an enclosed pH-sensitive hydrogel is measured with a micro pressure sensor. The application of the sensor is the quantification of the partial pressure of CO(2) (Pco(2)) in the stomach as diagnosis for gastrointestinal ischemia. The principle is put to the proof by examining the sensor response to changes in Pco(2). Furthermore, the response time, temperature-sensitivity and resolution are determined. The sensor responds well to changes in Pco(2) with a maximum pressure generation of 0.29 x 10(5) Pa at 20 kPa CO(2). The 90% response time varies between 1.5 and 4.5 minutes at 37( composite function)C. The sensor shows a linear temperature-sensitivity which can easily be compensated for, and enables detection of Pco(2) changes as small as 0.5 kPa CO(2).

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“…Trinh et al, 2006) Herber et al presented a sensor based on a pH-sensitive hydrogel for the detection of carbon dioxide gas inside the stomach, in order to diagnose gastrointestinal ischemia. (Herber et al, 2003(Herber et al, , 2004(Herber et al, , 2005a(Herber et al, , 2005b Further, a novel hydrogel piezoresistive sensor array has been developed for in vitro monitoring of pH, ionic strength, and glucose concentration. The sensor consists of three components: hydroxypropyl methacrylate (HPMA), N,N-dimethylaminoethyl methacrylate (DMA) and the crosslinker tetra-ethyleneglycol dimethacrylate (TEGDMA) hydrogel.…”

Section: Smart Polymers As Sensorsmentioning

confidence: 99%