Controlled deposition of sol–gel sensor material using hemiwicking

Mikkelsen, Morten Bo Lindholm; Marie, Rodolphe; Hansen, Jan; Wencel, Dorota; McDonagh, Colette; Nielsen, Hans Ole; Kristensen, Anders

doi:10.1088/0960-1317/21/11/115008

Cited by 21 publications

(19 citation statements)

References 19 publications

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“…This mixture was then deposited onto a 4 mmØ micro-structured polycarbonate substrate. 70 After curing (110℃, 3 h) and conditioning in HEPES buffer (20 mM, 1 h), the new pH sensor spot was ready to use.…”

Section: Sensor Materials Synthesismentioning

confidence: 99%

Incorporating Fluorescent Nanomaterials in Organically Modified Sol-Gel Materials – Creating Single Composite Optical pH Sensors

Bartos¹,

Rewers²,

Wang³

et al. 2021

Preprint

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<br><br>Optical sensors hold the promise of providing the coupling between the tangible and the digital world that we are currently experiencing with physical sensors. The core of optical sensor development lies in materials development, where specific requirements of opposing physicochemical properties create a significant obstacle. The sensor material must provide dye retention, while ensuring porosity for analyte transport. The sensor material must provide hydrophobic pockets for dyes to ensure high signal intensity, while remaining fully hydrophobic to measure in water. We have previously reported optical sensors, where we compromised on sensor manufacturing by using a double-layer composite. Here, we report a composite organically modified sol-gel (ORMOSIL) polymer, where polystyrene (PS) nanoparticles (NPs) have been incorporated. This allows all the opposing requirements on optical sensor materials to be fulfilled, and by introducing a hydrophobic reference dye in the fully hydrophobic compartments of the sensor material we show that we can incorporate any hydrophobic fluorophore in this material, even those which are suffering from quenching in water. In this work, PS NPs with 1,13-dimethoxyquinacridinium (DMQA) were immobilized in a composite sol-gel material with pH responsive diazaoxatriangulenium (DAOTA) dyes prior to curing. The multicomponent sensor composite was cured on a polycarbonate hemiwicking substrate, and the resulting fluorescence intensity ratiometric optical pH sensor was shown to have excellent performance. We expect that this type of composite sensor materials will allow the creation of next generation industrial chemosensors.<br><br>

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Section: Sensor Materials Synthesismentioning

confidence: 99%

Incorporating Fluorescent Nanomaterials in Organically Modified Sol-Gel Materials – Creating Single Composite Optical pH Sensors

Bartos¹,

Rewers²,

Wang³

et al. 2021

Preprint

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“…Sensor spots are produced by deposition of a small amount (microliters) of sensor material sol–gel on a micropillar structured polycarbonate substrate using the hemiwicking method. [15g,20] The full procedure is described in the Supporting Information. A sensor spot is 6 mm in diameter and contains 4 micromoles sol–gel and 0.6 nanomoles fluorescent dye.…”

Section: Sensor Characteristics For Optodes Made From the Methyl‐sulfmentioning

confidence: 99%

A Fluorescence Intensity Ratiometric Fiber Optics–Based Chemical Sensor for Monitoring pH

Rosenberg

Laursen

Frankær

et al. 2018

Adv Materials Technologies

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Accurate determination of pH is essential, yet a single technology is relied upon for almost all pH measurements. Here, a new optical pH sensor is described. Two highly photostable fluorescent dyes with a polymerizable side chain are incorporated into a composite polymer that allows for fast transport of protons. A pH‐responsive dye and a reference dye with limited response to pH are used, thus allowing for determining pH using a ratiometric fluorescence intensity response. The sensor material—dyes covalently attached in the composite polymer—is deposited on a polycarbonate hemiwicking substrate, and immobilized on the inside of a shaker flask. In this manner, two robust pH optodes with pKa values of 5.30 and 6.11 are prepared. The pH‐responsive composite materials are addressed using fiber optics, and the response is recorded on a fiber spectrometer. The optodes are shown to have low drift, fast response time, no leachables, and the sensor is shown to work in heterogeneous media exemplified with coffee, beer, and cola.

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“…Microdroplets with designer geometries can be utilized for a variety of applications, including droplet transport and splitting,1–3 3D microgel synthesis,4 liquid‐assisted molding,5, 6 self‐alignment,7, 8 dried droplet solute deposition4, 9, 10 and humidity extraction 11. Patterned areas for microdroplets have also evolved in nature (e.g., in the water‐collecting apparatus of a desert beetle) 12.…”

Section: Advancing Contact Angles Of Water and Octanol On Different Smentioning

confidence: 99%

Multiphase Designer Droplets for Liquid‐Liquid Extraction

2012

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Controlled deposition of sol–gel sensor material using hemiwicking

Cited by 21 publications

References 19 publications

Incorporating Fluorescent Nanomaterials in Organically Modified Sol-Gel Materials – Creating Single Composite Optical pH Sensors

Incorporating Fluorescent Nanomaterials in Organically Modified Sol-Gel Materials – Creating Single Composite Optical pH Sensors

A Fluorescence Intensity Ratiometric Fiber Optics–Based Chemical Sensor for Monitoring pH

Multiphase Designer Droplets for Liquid‐Liquid Extraction

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