Urea sensing materials via solidified crystalline colloidal arrays

Zeng, Fang; Wu, Shuizhu; Sun, Zhaohua; Xi, Hongyuan; Li, Ruifeng; Hou, Zhilin

doi:10.1016/s0925-4005(01)00965-0

Cited by 14 publications

(8 citation statements)

References 14 publications

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“…These materials change their volume, mass and elasticity reversibly in response to a change in the properties of the liquid phase such as temperature [10], pH value [11], solvent composition [12], or salt contents [13]. Specially polymerized hydrogels are sensitive to a number of chemical and biochemical species, for example, metal ions [14], surfactants [15,16], urea [17], specific antigens [18], and glucose [19]. Smart hydrogels, utilized as actuator-sensor systems can be used for the automatic regulation of a liquid flow.…”

Section: Introductionmentioning

confidence: 99%

Characterization of a microgravimetric sensor based on pH sensitive hydrogels

Richter

Bund

Keller

et al. 2004

Sensors and Actuators B: Chemical

144

118

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Section: Introductionmentioning

confidence: 99%

Characterization of a microgravimetric sensor based on pH sensitive hydrogels

Richter

Bund

Keller

et al. 2004

Sensors and Actuators B: Chemical

144

118

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“…Shifting from CCA hydrogel composites sensitive to ions to materials being able to recognize small molecules, we again find various strategies being employed that integrate and transform the recognition and further processing to a swelling effect readily recorded as shifts in the reflection. Examples of molecules being detected by this approach include, e.g., glucose [ 145 , 146 ], urea [ 147 ], ethanol [ 148 ], creatinine [ 149 ], or ammonia [ 150 ]. For glucose, phenylboronic acid (PBA) groups are introduced in the hydrogel network and the CCA embedded hydrogel becomes sensitive to this analyte (and other bearing cis-hydroxyls) in a concentration-dependent manner.…”

Section: Nanoparticles As Tools For Studying and Monitoring Hydrogmentioning

confidence: 99%

Nanoparticle-Hydrogel Composites: From Molecular Interactions to Macroscopic Behavior

2019

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Hydrogels are materials used in a variety of applications, ranging from tissue engineering to drug delivery. The incorporation of nanoparticles to yield composite hydrogels has gained substantial momentum over the years since these afford tailor-making and extend material mechanical properties far beyond those achievable through molecular design of the network component. Here, we review different procedures that have been used to integrate nanoparticles into hydrogels; the types of interactions acting between polymers and nanoparticles; and how these underpin the improved mechanical and optical properties of the gels, including the self-healing ability of these composite gels, as well as serving as the basis for future development. In a less explored approach, hydrogels have been used as dispersants of nanomaterials, allowing a larger exposure of the surface of the nanomaterial and thus a better performance in catalytic and sensor applications. Furthermore, the reporting capacity of integrated nanoparticles in hydrogels to assess hydrogel properties, such as equilibrium swelling and elasticity, is highlighted.

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“…The change in the reflection can be measured through the skin or by an optical fiber with reflection spectrometer and correlated with the concentration [95]. Photonic crystals can be functionalized to become sensitive to a wide range of physiologically relevant analytes such as Pb 2+ ions [96,97], urea [98], glucose [99], creatinine [100], and ammonia [101] and pH in the physiological range (4.5-9.0) [102,103]. Glucose sensing with photonic crystals has been demonstrated with a detection limit of~100 µM in the solution [104] and tear fluid [105].…”

Section: Photonic Crystalsmentioning

confidence: 99%

Toward biomaterial-based implantable photonic devices

et al. 2017

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Optical technologies are essential for the rapid and efficient delivery of health care to patients. Efforts have begun to implement these technologies in miniature devices that are implantable in patients for continuous or chronic uses. In this review, we discuss guidelines for biomaterials suitable for use in vivo. Basic optical functions such as focusing, reflection, and diffraction have been realized with biopolymers. Biocompatible optical fibers can deliver sensing or therapeutic-inducing light into tissues and enable optical communications with implanted photonic devices. Wirelessly powered, light-emitting diodes (LEDs) and miniature lasers made of biocompatible materials may offer new approaches in optical sensing and therapy. Advances in biotechnologies, such as optogenetics, enable more sophisticated photonic devices with a high level of integration with neurological or physiological circuits. With further innovations and translational development, implantable photonic devices offer a pathway to improve health monitoring, diagnostics, and light-activated therapies.

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Urea sensing materials via solidified crystalline colloidal arrays

Cited by 14 publications

References 14 publications

Characterization of a microgravimetric sensor based on pH sensitive hydrogels

Characterization of a microgravimetric sensor based on pH sensitive hydrogels

Nanoparticle-Hydrogel Composites: From Molecular Interactions to Macroscopic Behavior

Toward biomaterial-based implantable photonic devices

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