Potassium-ion-selective sensing based on selective reflection of cholesteric liquid crystal membranes

Kado, Shinpei; Takeshima, Yuuhei; Nakahara, Yoshio; Kimura, Kazuhiro

doi:10.1007/s10847-011-9970-1

Cited by 17 publications

(15 citation statements)

References 13 publications

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“…The same technique could be applied to almost any responsive CLCs. For example, the CLCs have been made sensitive to pH [29], metal ions [30][31][32], amino acids [33], etc. This makes it feasible to design and develop novel CLC materials for the application in remote sensing of a variety of physical and chemical parameters.…”

Section: Resultsmentioning

confidence: 99%

Remote and autonomous temperature measurement based on 3D liquid crystal microlasers

Pirnat¹,

Humar²,

Muševič³

2018

Opt. Express

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We demonstrate non-contact temperature measurement with one tenth of a kelvin precision at distances of several meters using omnidirectional laser emission from dye-doped cholesteric liquid crystal droplets freely floating in a fluid medium. Upon the excitation with a pulsed laser the liquid crystal droplet emits laser light due to 3D Bragg lasing in all directions. The spectral position of the lasing is highly dependent on temperature, which enables remote and contact-less temperature measurement with high precision. Both laser excitation and collection of light emitted by microlasers is performed through a wide telescope aperture optics at a distance of up to several meters. The optical excitation volume, where the droplets are excited and emitting the laser light is of the order of ten cubic millimeters. The measurement is performed with ten second accumulation time, when several droplets pass through the excitation volume due to their motion. The time of measurement could easily be shortened to less than a second by increasing the rate of the excitation laser. Since the method is based solely on measuring the spectral position of a single and strong laser line, it is quite insensitive to scattering, absorption and background signals, such as autofluorescence. This enables a wide use in science and industry, with a detection range exceeding tens of meters.

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Section: Resultsmentioning

confidence: 99%

Remote and autonomous temperature measurement based on 3D liquid crystal microlasers

Pirnat¹,

Humar²,

Muševič³

2018

Opt. Express

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“…Liquid crystal Bragg onion lasers had a linear temperature dependence in the lasing wavelengths, offering the possibility of temperature sensing, but can be made also temperature insensitive by polymerizing into solid spheres [30,31]. The periodicity of polymerized cholesteric liquid crystals can be made sensitive to a variety of analytes including metal ions [32,33], amino acids [34] and pH [35], for chemical and biomolecular sensing applications. In this work synthetic dyes were employed as gain material, but other biocompatible materials could be used, for example fluorescent proteins [36,37], vitamins [15] and medically approved dyes (fluorescein and indocyanine green).…”

Section: Discussionmentioning

confidence: 99%

Biomaterial microlasers implantable in the cornea, skin, and blood

Humar

Dobravec

Zhao

et al. 2017

Optica

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Stand-alone laser particles that are implantable into biological tissues have potential to enable novel optical imaging, diagnosis and therapy. Here we demonstrate several types of biocompatible microlasers and their lasing action within biological systems. Dye-doped polystyrene beads were embedded in the cornea and optically pumped to generate narrowband emission. We fabricated microbeads with poly(lactic-co-glycolic acid) and poly(lactic acid)—substances approved for medical use—and demonstrate lasing from within tissues and whole blood. Furthermore, we demonstrate biocompatible cholesterol-derivative microdroplet lasers via self-assembly to an onion-like radially-resonant photonic crystal structure.

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“…As a rule, complexation of such compounds leads to increasing the helical pitch and, as a consequence, shifts the selective light reflection to the long wavelengths. Unfortunately, the authors of these works14–17 did not present a plausible explanation of the observed effects. Moreover, the major disadvantage of such systems is still their liquid state that makes difficult to use them for sensor films or coatings preparation.…”

Section: Introductionmentioning

confidence: 97%

“…There are different approaches to realize this task. One of them consists of chemical linkage of crown ethers with molecules responsible for cholesteric mesophase formation 14–17. As a rule, complexation of such compounds leads to increasing the helical pitch and, as a consequence, shifts the selective light reflection to the long wavelengths.…”

Section: Introductionmentioning

confidence: 99%

A Novel Type of Crown Ether‐Containing Metal Ions Optical Sensors Based on Polymer‐Stabilized Cholesteric Liquid Crystalline Films

Stroganov

Ryabchun

Bobrovsky

et al. 2012

Macromol. Rapid Commun.

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For the first time, the films based on polymer-stabilized cholesteric composites containing crown ether fragments with the optical properties sensitive to the complexation with potassium and barium ions were obtained. The complexation with these ions leads to blue spectral shift of the selective light reflection of planar cholesteric texture of composite films. Peculiarities of spectral changes and kinetics of selective light reflection shift were studied. The proposed approach can be used for the creation of the effective and selective sensor materials for different ions or groups of ions.

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Potassium-ion-selective sensing based on selective reflection of cholesteric liquid crystal membranes

Cited by 17 publications

References 13 publications

Remote and autonomous temperature measurement based on 3D liquid crystal microlasers

Remote and autonomous temperature measurement based on 3D liquid crystal microlasers

Biomaterial microlasers implantable in the cornea, skin, and blood

A Novel Type of Crown Ether‐Containing Metal Ions Optical Sensors Based on Polymer‐Stabilized Cholesteric Liquid Crystalline Films

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