Electrical sensing properties of silica aerogel thin films to humidity

Wang, Chien-Tsung; Wu, Chun-Lung

doi:10.1016/j.tsf.2005.09.001

Cited by 63 publications

(30 citation statements)

References 22 publications

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“…[1][2][3][4][5] The distinctive pore structure and the charged surface of the aerogel especially facilitates the adsorption of polar molecules and cations. [6][7][8] This generated increasing demand for thorough description of the kinetics and thermodynamics of the adsorption processes on these advanced materials.…”

Section: Introductionmentioning

confidence: 99%

The pore network and the adsorption characteristics of mesoporous silica aerogel: adsorption kinetics on a timescale of seconds

et al. 2015

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Abstract. Mesoporous silica aerogel particles of ca. 5 µm in diameter can be conveniently produced by grinding in aqueous phosphate buffer at pH 7. The pores in the suspended aerogel particles are spherical and their diameter is 18 -20 nm, as measured by NMR cryoporometry.NMR diffusiometry revealed that diffusion of water is hindered inside the pores of the aerogel. In spite of steric hindrance, bulk water and pore water exchange rapidly on the millisecond timescale in the suspension, indicating a highly interconnected pore network. The adsorption of methylene blue (MB), as a model compound, was studied on the silica aerogel particles. The process was followed by on-line UV-Vis spectrophotometry after injecting the dye into the aerogel suspension. Biphasic kinetics was observed with the first process complete in ca. 80 s and the second in ca. 600 s. A detailed kinetic model was developed for the interpretation of the results. It postulates a relatively fast adsorption process with Langmuir-type kinetics, and the aggregation of aerogel particles covered by the dye on the longer timescale. The aggregates are involved in a reversible sedimentation process which actually remove MB from the suspension.

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Section: Introductionmentioning

confidence: 99%

The pore network and the adsorption characteristics of mesoporous silica aerogel: adsorption kinetics on a timescale of seconds

et al. 2015

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“…6 Among the different ceramic systems, the type of conduction might be electronic or ionic. [7][8][9][10] In any case, a matrix with a high specific surface area is required to support the sensing component as for example, infiltrated silica. 11 In this sense, the use of nanostructured materials improves the sensibility of the different sensors because they present a higher specific surface area.…”

Section: Introductionmentioning

confidence: 99%

Iron-oxide nanoparticles supported on sepiolite as a novel humidity sensor

Esteban‐Cubillo

Tulliani

Pecharromán

et al. 2007

Journal of the European Ceramic Society

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“…Various porous metal oxide-silica nanocomposite films with enhanced gas-sensitive properties have been proposed for gas sensors [1][2][3][4][5][6][7][8][9]. The porosity of matrix provides a path for the gas molecules to reach the functional oxide nanoparticles and the films show reversible change in resistance and/or optical transmittance in the VIS-NIR range when exposed to gases.…”

Section: Introductionmentioning

confidence: 99%