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Wittouck, Nadine; Schryver, Frans De; Snijkers-Hendrickx, I.

doi:10.1023/a:1018379317478

Cited by 5 publications

(6 citation statements)

References 12 publications

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“…Similar results were obtained by Wittouck et al 42 when probing the polarity of hybrid TEOS and MeTEOS thin films. They also found a blue shift of the fluorescence band on adding increasing amount of MeTEOS.…”

Section: 32supporting

confidence: 88%

“…24,[33][34][35][36][37][38] In the second method, pyranine, a highly fluorescing compound whose excited state is very sensitive to the microenvironment, is used to probe the local polarity changes via its interaction with the pore surface and with interstitial water. [39][40][41][42][43] 3.3.1. Near IR vibrational spectroscopy.…”

Section: Probing the Pore Polaritymentioning

confidence: 99%

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Chemical sensors of monocyclic aromatic hydrocarbons based on sol–gel materials: synthesis, structural characterization and molecular interactions

et al. 2002

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Low cost materials based on hybrid organic-inorganic sol-gel systems have been developed for use in the trapping and detection of monocyclic aromatic hydrocarbon contaminants emitted into the atmosphere. To this end, two strategies are followed; the first one aims at tailoring the pore size in order to selectively trap and discriminate benzene and toluene. The second is to decrease the pore polarity in order to eliminate the main interfering gas of the atmosphere, water vapor. The results of these strategies are reported in this paper. After describing the synthesis of silicon hybrid xerogels and thin films and the characterisation of their structural properties, we report the study of the local polarity of the pores, of the porosity and optical properties of the materials. These characterisation data will enable us to define the materials suited for hosting benzene and toluene.

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Section: 32supporting

confidence: 88%

Section: Probing the Pore Polaritymentioning

confidence: 99%

Chemical sensors of monocyclic aromatic hydrocarbons based on sol–gel materials: synthesis, structural characterization and molecular interactions

et al. 2002

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“…The dissociation equilibrium of pyranine is highly dependent on the surrounding environment during the gel-xerogel transition 26,27 and, as the surface of the pore now has a large population of alkyl groups that do not interact readily with the protonated dye, the fluorescence emission at 515 nm associated with the deprotonated state becomes more prominent. 28 The deprotonated form of the dye is also more stable within water rich environments, as the proton acceptor capabilities of water allow the deprotonated dye to dominate. In solvents with low proton acceptor capabilities, such as ethanol, the protonated dye will prevail.…”

Section: Introductionmentioning

confidence: 99%

Dye-doped organically modified silica glass for fluorescence based carbon dioxide gas detection

Malins

MacCraith²

1998

Analyst

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“…[1][2][3][4][5][6] Hydrolysis and condensation of tetraalkoxysilanes can be done in the presence of either a dispersed additive such as an organic polymer, producing a Class I material, [7][8][9][10][11] or along with an organosilane, leading to Class II materials with covalently anchored functional groups. 7,10,12,13 Incorporation of both dispersed and anchored organic groups is also possible, leading to Class I/II nanocomposite materials.…”

Section: Introductionmentioning

confidence: 99%

Fluorescence and physical characterization of sol–gel-derived nanocomposite films suitable for the entrapment of biomolecules

Goring

Brennan

2002

J. Mater. Chem.

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Thin films (100-500 nm thick) of Class I, Class II and Class I/II organic-inorganic hybrid silicates were prepared by casting mixtures of tetraethyl orthosilicate, methyltriethoxysilane and/or dimethyldimethoxysilane that were first hydrolyzed via sonication using acid catalysis, followed by induction of gelation using added buffer solutions containing no polymer or 3% w/v of poly(ethylene glycol). In some cases, the fluorescent probe 6-propionyl-2-dimethylaminonaphthalene (PRODAN) or the protein human serum albumin (HSA) were also added to the buffer solution, which permitted the fluorescence probing of the internal environment and biological activity within the various silicate films, respectively. Parameters such as the type and level of organosilane precursor, polymer level, casting speed, and aging time were varied to determine how such factors affected the thickness, morphology, and internal environment of the resulting films that were formed by this two-step process. The results show that composite films evolve in two stages: (1) rapid drying during the initial 1-2 h after casting of the film, followed by (2) a slower aging process that continues for many months. The aging of these thin films is different to that of bulk materials and the final state of the films can be quite different from that obtained for bulk materials. Preliminary studies of HSA-doped films show that the entrapped protein adopts a partially expanded conformation, but in most cases is still able to bind to ligands.

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Untitled

Cited by 5 publications

References 12 publications

Chemical sensors of monocyclic aromatic hydrocarbons based on sol–gel materials: synthesis, structural characterization and molecular interactions

Chemical sensors of monocyclic aromatic hydrocarbons based on sol–gel materials: synthesis, structural characterization and molecular interactions

Dye-doped organically modified silica glass for fluorescence based carbon dioxide gas detection

Fluorescence and physical characterization of sol–gel-derived nanocomposite films suitable for the entrapment of biomolecules

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