Hybrid organic-inorganic sensors

Bescher, Eric P.; Mackenzie, John D.

doi:10.1016/s0928-4931(98)00039-3

Cited by 60 publications

(30 citation statements)

References 45 publications

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“…In recent years, organic-inorganic hybrids have been developed as potential solutions to a wide array of problems including sensors 1 and lasers 2,3 . Organically modified silicas (ormosils) are one type of organic-inorganic hybrid 1 .…”

Section: Introductionmentioning

confidence: 99%

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Organic−Inorganic Hybrid Nanoparticles: Surface Characteristics and Interactions with a Polyester Resin

et al. 2006

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Organic-inorganic hybrid nano-particles, derived from silica precursors with different organic functionalities (methyl, ethyl, vinyl and phenyl) synthesized via a modified Stöber method have been investigated. These particles are intended as modifiers for polymers and polymer matrix composites.Therefore the characteristics of a polyester matrix have also been determined and the likely interactions with the particles have been proposed. Particles have been characterized using inverse gas chromatography (IGC), x-ray photoelectron spectroscopy (XPS) and infra-red spectroscopy (FT-IR).The particles show two different sets of characteristics, with methyl, ethyl, and vinyl modified silicas showing one type of behavior and the phenyl modified silica behaving rather differently. The methyl, ethyl and vinyl groups exhibit the appearance of uniform coverage, as they are comparatively small and tightly packed, which will prevent interaction of matrix resin with retained silanol groups. The phenyl group, which is comparatively large, is not able to pack as closely, which results in a reduction of the presence and availability of silanol groups, compared to an unmodified fumed silica, but not complete inaccessibility as far as the matrix resin is concerned.

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Section: Introductionmentioning

confidence: 99%

“…Organically modified silicas (ormosils) are one type of organic-inorganic hybrid 1 . Work is currently underway to determine the efficacy of a range of ormosils (in nano-particulate form) as modifiers for polymers and polymer matrix composites [4][5][6][7] .…”

Section: Introductionmentioning

confidence: 99%

Organic−Inorganic Hybrid Nanoparticles: Surface Characteristics and Interactions with a Polyester Resin

et al. 2006

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“…In recent years, organic-inorganic hybrids have been developed as potential solutions to a wide array of problems including sensors 1 and dye lasers 2 .…”

Section: Introductionmentioning

confidence: 99%

“…ORganically MOdified SILicaS (ormosils) are one type of organic-inorganic hybrid 1 . Work is currently underway to determine the efficacy of a range of ormosils (in nano-particulate form) as modifiers for polymers and polymer matrix composites.…”

Section: Introductionmentioning

confidence: 99%

Organic–inorganic hybrid nanoparticles: adsorption characteristics of polyester resins

Jesson

Abel

Arkhireeva

et al. 2004

Surface & Interface Analysis

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The adsorption of polyester onto organically modified silicas (ormosils) and (commercial) fumed silica has been compared utilising ToF-SIMS. The thermodynamics of each system was examined by constructing adsorption isotherm plots which indicated that the adsorption of polyester onto one of the modified silicas used may be a two stage process. Adsorption onto the fumed silica is in accord with the Langmuir model.

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“…Las propiedades de la fluoresceína han permitido que se utilice como marcador óptico en biología [4] y que actualmente se pretenda explotar como indicador óptico (absorción y luminiscencia) de pH [2,3,5]. En el desarrollo de sensores ópticos, la incorporación de moléculas orgánicas a una matriz porosa de tipo sol-gel [6][7][8] resulta ventajosa, ya que se evitan o disminuyen algunos de los inconvenientes de su uso en disolución, tales como procesos de contaminación y degradación de la molécula, procesos no radiativos, etc., además de ofrecer la posibilidad de ser reutilizados. Otras ventajas que presentan los recubrimientos sol-gel son la relativa facilidad de preparación, el bajo coste, la gran resistencia química, la buena adherencia mecánica, y la aptitud del sol para recubrir muchos tipos de superficies.…”

Section: Introductionunclassified

Estudio de las propiedades ópticas de recubrimientos Sol-Gel dopados con fluoresceína en función de la concentración y del pH

García¹,

Montero²,

Broncano³

2004

Bol. Soc. Esp. Ceram. Vidr.

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Se investiga la variación con el pH de las propiedades ópticas (absorción y luminiscencia) de moléculas de fluoresceína incorporadas a recubrimientos porosos sol-gel en un intervalo de concentraciones comprendido entre 0,5 y 3, % en peso. Los espectros de absorción de los recubrimientos presentan bandas principales en 435 nm y 47 nm para pH ácido y básico, respectivamente. Al comparar con los espectros de las disoluciones, la posición de ambos máximos se desplaza hacia el rojo y aparecen en 43 nm y 492 nm. La dependencia de la absorción de la fluoresceína en recubrimientos y disoluciones se ajusta a la ley de Lambert-Beer. Al excitar los recubrimientos y las disoluciones con fotones de la región en que la absorción es importante, los espectros de fotoluminiscencia muestran una banda ancha principal en 520 nm, tanto para pH ácido como para básico. En este caso y contrariamente a lo observado en los espectros en disolución, la intensidad a 520 nm decrece con el pH al aumentar éste desde 2 a 12. Palabras clave: fluoresceína, pH, recubrimientos sol-gel, absorción, fotoluminiscencia Study of optical properties of fluorescein-doped sol-gel coatings as a function of concentration and pHOptical properties (absorption and luminescence) of fluorescein molecules encapsulated in porous sol-gel coatings for concentrations ranging from 0.5 to 3. wt % are investigated as a function of pH. Absorption spectra of the coatings show main bands at 435 nm and 47 nm for acid and basic pH, respectively. Both peaks appear in the solutions of fluorescein redshifted at 43 nm and 492 nm. However, the dependence in intensity of both peaks as a function of pH is found essentially similar between coatings and solutions. In both cases, the absorption dependence on concentration can be fitted to the Lambert-Beer law. On the other way, photoluminescent spectra of coatings and solutions upon excitation in the peak absorption region, show a dominant broad band peaked at 520 nm for both acid and basic pH. The intensity of the 520 nm-coating band displays a decreasing behaviour with increasing pH from 2 to 12, in contrast with those found for the same peak when the corresponding solutions were analysed.

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Hybrid organic-inorganic sensors

Cited by 60 publications

References 45 publications

Organic−Inorganic Hybrid Nanoparticles: Surface Characteristics and Interactions with a Polyester Resin

Organic−Inorganic Hybrid Nanoparticles: Surface Characteristics and Interactions with a Polyester Resin

Organic–inorganic hybrid nanoparticles: adsorption characteristics of polyester resins

Estudio de las propiedades ópticas de recubrimientos Sol-Gel dopados con fluoresceína en función de la concentración y del pH

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