A method for the preparation of transparent mesoporous silica sol–gel monoliths containing grafted organic functional groups

Clavier, Cheri W.; Rodman, David; Sinski, Joseph F.; Allain, Leonardo R.; Im, Hee‐Jung; Yang, Yue-De; Clark, Joseph Y.; Chen, Xue-Tai

doi:10.1039/b417014h

Cited by 27 publications

(33 citation statements)

References 58 publications

(5 reference statements)

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“…Many sensing techniques that are capable of portability are electrochemical in nature [60,61] , but some optical techniques have also been reported [25] . We have explored the use of ligand grafted sol-gel monoliths for the detection of Cu 2+ and chromate ions using optical signal transduction [23,24,26] . The determination of Cu 2+ ions is based on the formation of Cu 2+ -amine complexes between the Cu 2+ ions and amine ligands that are imprint-grafted on sol-gel monoliths [62][63][64][65] .…”

Section: Optical Metal Sensing Using Sol-gel Monolithsmentioning

confidence: 99%

“…Our work on metal ion sensing using sol-gel monoliths removes these shortcomings by: (1) extending the pathlengths from μm-thick thin films to the ~4-5 mm; (2) coupling diffusion of the analyte to the binding sites and complexation of the analyte with the grafted ligands. The preparation of blank and amine grafted monoliths for the detection of Cu 2+ is shown in Scheme 4 [23] . These monoliths are crack-free, optically transparent, and have mesosized pores.…”

Section: Optical Metal Sensing Using Sol-gel Monolithsmentioning

confidence: 99%

“…Such materials have been used for catalysts in green chemistry [55] , separation stationary phases [56] , sensors [4,23,24,45] , electrochemistry [31,32,57,58] , and organic synthesis [59] . Several welldeveloped techniques exist for the detection of metal ions including atomic absorption or emission (AAS, or ICP-OES) and mass spectrometry (ICP-MS).…”

Section: Optical Metal Sensing Using Sol-gel Monolithsmentioning

confidence: 99%

“…One of the most important features for optical sensing is that they are transparent in the visible region [13] . Sol-gels have found applications in the optical monitoring of pH [3,5,8,9,[14][15][16][17][18][19][20][21][22] , metal ions [23][24][25][26][27] , and various other analytes [28][29][30] . Sol-gels have also found use in electrochemical [31 -38] and spectroelectrochemical [39] sensing applications.…”

Section: Introductionmentioning

confidence: 99%

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Optical and electrochemical sol-gel sensors for inorganic species

Dansby-Sparks

Ouyang

Chen

2009

Sci. China Ser. B-Chem.

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The use of sol-gels as a sensing matrix for the development of unique sensing strategies is discussed. Sol-gels offer almost limitless possibilities for sensing substrates due to the variety of physical properties that can be obtained by altering a number of discussed fabrication conditions and techniques. By careful consideration of the sensing requirements, novel detection methods have been developed for a variety of analytes and applications. Here, sol-gels have been used to monitor pH at the extreme ends of the scale ([H + ] = 1-11 M and [OH − ] = 1-10 M) and in mixed solvent/solute systems using dual sensing approaches. The use of ligand-grafted sol-gel monoliths for optical determination of metal ion species is also discussed. The electrochemical determination of Cr(Ⅵ) by electrodeposited sol-gel modified electrodes is also presented.sol-gel, organofunctional, acid, base, metal ions

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Section: Optical Metal Sensing Using Sol-gel Monolithsmentioning

confidence: 99%

Section: Optical Metal Sensing Using Sol-gel Monolithsmentioning

confidence: 99%

Section: Optical Metal Sensing Using Sol-gel Monolithsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Optical and electrochemical sol-gel sensors for inorganic species

Dansby-Sparks

Ouyang

Chen

2009

Sci. China Ser. B-Chem.

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“…Amounts of chemicals to obtain silica monolith named SG-M were used as described in [8], i.e. 5 ml of TMOS was mixed with 5 ml of methanol (POCH, Poland) and 2.5 ml of 0.06 M NaOH.…”

Section: Methodsmentioning

confidence: 99%

Porosity of Silica Monoliths with Tailored Mesopores of Ink-Bottle Shape Determined by Nitrogen Adsorption and Positron Annihilation Lifetime Spectroscopy

et al. 2017

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The comparison of pore size distributions obtained with the use of two porosimetric methods: low temperature nitrogen sorption (LN2) and positron annihilation lifetime spectroscopy (PALS), was performed for porous silica monoliths. Four investigated samples were prepared under various synthesis conditions. Nitrogen sorption showed the presence of bottle-shaped pores in all investigated samples. In addition, it seems that the presence of methanol during synthesis influences porosity to a greater extent than organic additives. Quite good agreement between the LN2 and PALS results was observed only for the silica monolith synthesized with β-cyclodextrins as pore directing agent. The biggest discrepancy in the results obtained from these two techniques was observed for the silica gel synthesized with no additives. The origin of such discrepancies, taking into account the shape of pore size distribution and deficiencies of data analysis techniques, is discussed.

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