New procedure of silica gel surface modification

Świtaj-Zawadka, A.; Konieczka, Piotr; Szczygelska-Tao, Jolanta; Biernat, Jan F.; Namieśnik, Jacek

doi:10.1016/j.chroma.2004.01.025

Cited by 11 publications

(7 citation statements)

References 21 publications

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“…24 Another proposed application of functionalized silica particles is the generation of methyl chloride for calibration of instruments dealing with environmental monitoring. 25…”

Section: Introductionmentioning

confidence: 99%

Sulfur-Functionalization of Porous Silica Particles and Application to Mercury Vapor Sorption

Meeks

Rankin

Bhattacharyya

2010

Ind. Eng. Chem. Res.

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Silanol (SiOH) groups on silica particle surfaces undergo silylation reactions with organosilane molecules to give functionalized particles, which are used in many applications. The determination of the extent of this reaction is important for proper design of functionalized materials, depending upon the application. Two types of porous silica particles (206 and 484 m2 g−1; 9.6 and 2.9 nm average pore diameter, respectively), and colloidal silica (Ludox) with a nonporous base particle of 22 nm diameter, were functionalized with sulfur-containing silanes, 3-mercaptopropyl trimethoxy silane (MPTMS), and bis[3-(triethoxysilyl) propyl]-tetrasulfide (S4). Maximum extent of functionalization was determined with S4 using Fourier transform infrared spectrometry (FTIR), thermogravimetric analysis (TGA), and total S analysis. For the two types of porous silica particles, FTIR indicated that 54 and 17% of the silanol groups were functionalized with S4, and TGA indicated that the functionalized particles were 12 and 11 mass % MPTMS, respectively. These results were independently confirmed with total sulfur analysis. Extents of functionalization were determined for varying the silane structure on the same silica particle. MPTMS reacted with 38% of functional groups, while S4 reacted with 17%; the mass % of silane is the same regardless of silane structure on the same silica particle. Characterization by DSC indicated a glass transition occurs in the silane layer of the S4-functionalized silica at about 85 °C, but not in the MPTMS functionalized particles. Finally, mercury sorption breakthrough curves indicate the pore characteristics of the S4 functionalized samples.

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“…24 Another proposed application of functionalized silica particles is the generation of methyl chloride for calibration of instruments dealing with environmental monitoring. 25…”

Section: Introductionmentioning

confidence: 99%

Sulfur-Functionalization of Porous Silica Particles and Application to Mercury Vapor Sorption

Meeks

Rankin

Bhattacharyya

2010

Ind. Eng. Chem. Res.

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“…The solution based on using thermal decom-position of immobilized compounds for the generation of standard mixtures of toxic, reactive and malodorous analytes seems to be an interesting approach to this problem. So far, this technique has been used for the preparation of standard gaseous mixtures containing the following analytes [11][12][13][14]: acetone, acetaldehyde, amines, ammonia, methyl chloride, ethene, thiols, isothiocyanates, carbon monoxide and/or dioxide.…”

Section: Methodsmentioning

confidence: 99%

“…1. Thus far, silica gel, porous glass, glass rods coated with silica gel and glass fibers have been as support for immobilized compounds [11,[13][14][15][16].…”

Section: Methodsmentioning

confidence: 99%

Production of gaseous matrix-free reference materials

Świtaj-Zawadka

Konieczka

Biernat

et al. 2006

J Therm Anal Calorim

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Reference materials are used in every laboratory in order to assure the appropriate quality of analytical results. The production of reference materials is not an easy task especially in the case of gaseous, toxic and malodorous compounds. Thermal decomposition of immobilized compounds is a convenient way for the generation of those kinds of mixtures. Temperature is an important variable in this process. In this case, thermoanalytical techniques (thermogravimetry and differential scanning calorimetry (TG-DSC)) and scanning electron microscopy (SEM) were used for checking the temperature range which had been previously determined using thermal desorber-gas chromatograph-flame ionization detector (TD-GC-FID) system.

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“…Among static and dynamic techniques available for the preparation of standard gas mixtures, thermal decomposition of a surface compound has recently become popular [8–11]. …”

Section: Introductionmentioning

confidence: 99%

“…Better carriers are now being sought to reduce the laborious and time-consuming modification of carrier surfaces, to eliminate errors that arise during weighing of the silica gel, and to eliminate adsorption of contaminants by the surface [11–13]. …”

Section: Introductionmentioning

confidence: 99%

New matrix-free reference material for ethene in the form of optical fibres

2012

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Reference materials are indispensable in the quality control and quality assurance of analytical measurements. One novel approach to the generation of standard gaseous mixtures of toxic, reactive, volatile, labile, and malodorous substances involves thermal decomposition or rearrangement, under defined temperature conditions, of compounds immobilized, by chemical bonding, on the surface of an appropriate carrier to release specific amounts of a volatile compound. In this technique the type of support used to immobilize the compound is extremely important, because the amount of analyte released depends directly on the choice of material. In this paper we report the novel preparation of a matrix-free ethene standard in the form of glass fibres coated with a thin layer of aluminium, the surface of which is modified by reaction with a specific compound. As a result of thermal decomposition of this compound, gaseous ethene is formed. In this paper we present the results obtained from tests of stability and homogeneity, two properties of crucial importance in the preparation of reference materials, by comparison of a series of results obtained for randomly chosen samples of the reference material. Interlaboratory comparative studies resulted in determination of a reference value for the ethene formed after thermal decomposition of the surface compound ((2.12 ± 0.14) ng per fibre).

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New procedure of silica gel surface modification

Cited by 11 publications

References 21 publications

Sulfur-Functionalization of Porous Silica Particles and Application to Mercury Vapor Sorption

Sulfur-Functionalization of Porous Silica Particles and Application to Mercury Vapor Sorption

Production of gaseous matrix-free reference materials

New matrix-free reference material for ethene in the form of optical fibres

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