A general one-pot process leading to highly functionalised ordered mesoporous silica films

Cagnol, Florence; Grosso, David; Sánchez, Clément

doi:10.1039/b403753g

Cited by 84 publications

(90 citation statements)

References 12 publications

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“…Cagnol et al [9] reported a general route for the direct synthesis of functionalized CTAB-templated silica thin films, using eleven organotrialkoxysilanes, differing by their physical-chemical properties. Brinkers group [10] used the one-pot method to prepared ordered aminopropyl functionalized silica thin films as pH sensors.…”

Section: Introductionmentioning

confidence: 99%

Thiol‐Functionalized Silica Thin Film Modified Electrode in Determination of Mercury Ions in Natural Water

Cesarino

Cavalheiro

2008

Electroanalysis

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The use of a thin thiol-functionalized silica film modified glassy carbon electrode in the determination of Hg(II) ions in a natural water sample is described. A typical measurement involves two successive steps: a glassy carbon electrode coated with a thin mesoporous silica film containing 10% of mercaptopropyl groups, according to the MPTMS/TEOS ratio in the starting sol-gel, was first immersed into the accumulation medium for 15 min, then removed, and finally transferred into a detection solution containing KCl 1.0 mol L À1 where detection was performed by anodic stripping voltammetry. In this medium the previously accumulated Hg 2þ species complexed by the thiol groups in an open circuit preconcentration step is then directly reduced at À 0.6 V during 60 s prior to be quantified by a differential pulse anodic scan from À 0.6 to 0.3 V (vs. Ag/AgCl). A stripping peak appeared at about À 0.01 V, which is directly proportional to the quantity of the analyte previously accumulated into the film. The best results were obtained under the following conditions: 100 mV pulse amplitude and 10 mV s À1 scan rate in 1.0 mol L À1 KCl solution pH 2.0. Using such parameters a linear dynamic range from 1.00 to 10.0 Â 10 À8 mol L À1 Hg(II) was observed with a limit of detection of 4.3 nmol L À1 for an accumulation time of 15 min. Hg(II) spiked in a natural water sample was determined between 97.0 and 101.4% mean recovery at 10 À8 mol L À1 level. The results indicate that this electrode is sensitive and selective for the Hg(II)determination.

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Section: Introductionmentioning

confidence: 99%

Thiol‐Functionalized Silica Thin Film Modified Electrode in Determination of Mercury Ions in Natural Water

Cesarino

Cavalheiro

2008

Electroanalysis

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“…It also allows the use of extraction as the only method for surfactant removal, as calcination could destroy organic compounds. After pioneering works of the groups of Mann and co-workers [33] and MacQuarrie [34], many different organically modified mesoporous silicas have been prepared by co-condensation, including those modified with alkyl, thiol, vinyl/allyl [35], amino, cyano/isocyano [36], alkoxy [37], organophosphine, and aromatic groups [38]. Periodic mesoporous organosilicas (PMOs) are materials with modified matrices but preserved organized pore system and narrow pore size distribution.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of hydrogen peroxide on functionalized mesoporous silica surfaces

2014

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MCM-41 and MSU-H mesoporous silicas were successfully functionalized with hydrogen bonds forming organic moieties, which have been proven by elemental analysis. Both moieties, based on oxygen and nitrogen containing groups, were introduced with high efficiencythe amount of carbon in all cases exceeded 10 % and the elemental ratios suggest binding to the surface through two or three Si-O-Si bonds. Hydrogen peroxide adsorption was conducted in its aqueous solutions and the amount adsorbed was determined using the ferric thiocyanate method. Results are presented as a function of hydrogen peroxide concentration in aqueous solution from 5 to 30 %. Both functionalized silicas show increased adsorption capacity when compared with that of their unfunctionalized analogues. The surface modified with nitrogen-based organic moiety revealed better adsorption properties as well as higher resistance against oxidation. MSU-H silica, due to its larger pore diameter, provides more space to bind hydrogen peroxide molecules and thus was found to have higher adsorption capacity: it adsorbed up to four times more hydrogen peroxide than MCM-41.

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“…1,2 The mesoporous structure is particularly useful for sensing applications, where short diffusion times and easy access of the target analyte towards the sensing species are required. 3 Regarding sensors, mesoporous materials have so far been mainly applied to electrodes 4,5 and to quartz-crystalmicrobalance (QCM) 6,7 sensors.…”

Section: Introductionmentioning

confidence: 99%

A Fast-Response pH Optode Based on a Fluoroionophore Immobilized to a Mesoporous Silica Thin Film

et al. 2010

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A general one-pot process leading to highly functionalised ordered mesoporous silica films

Abstract: Various organic moieties are homogeneously introduced in high quantities into mesostructured porous silica films through a general co-condensation process, which influences the self-assembly mechanism, depending on the physico-chemical properties of each function.

Cited by 84 publications

References 12 publications

Thiol‐Functionalized Silica Thin Film Modified Electrode in Determination of Mercury Ions in Natural Water

Thiol‐Functionalized Silica Thin Film Modified Electrode in Determination of Mercury Ions in Natural Water

Adsorption of hydrogen peroxide on functionalized mesoporous silica surfaces

A Fast-Response pH Optode Based on a Fluoroionophore Immobilized to a Mesoporous Silica Thin Film

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