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Structural dependence of the efficiency of functionalization of silica-coated FeO x magnetic nanoparticles studied by ATR-IR

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Title: Structural dependence of the efficiency of functionalization of silica-coated FeO x magnetic nanoparticles studied by ATR-IR
Authors: Vargas, Angelo1, Shnitko, Ivan1, Teleki, Alexandra2, Weyeneth, Stephen3, Pratsinis, Sotiris E.2, Baiker, Alfons1 baiker@chem.ethz.ch
Source: Applied Surface Science. Jan2011, Vol. 257 Issue 7, p2861-2869. 9p.
Subjects: Silica, Iron oxides, Nanoparticles, Infrared spectroscopy, Precipitation (Chemistry), Aerosols, Propanols
Abstract: Abstract: The efficiency of propylamino functionalization of magnetic silica-coated FeO x nanoparticles prepared by different methods, including coprecipitation and flame aerosol synthesis, has been evaluated by attenuated total reflection infrared spectroscopy (ATR-IR) combined with a specific surface reaction, thus revealing the availability of the grafted functional groups. Large differences in the population of reactive groups were observed for the investigated materials, underlining the tight relation between the structure of nanoparticles and their suitability for organic functionalization. The materials possessed different core structure, surface area, and porosity, as evidenced by transmission electron microscopy and nitrogen adsorption–desorption isotherms. Grafting of aminopropyl groups using a standard procedure based on reaction with (3-aminopropyl)trimethoxysilane as source of the propylamino groups was performed, followed by classical dry analysis methods to determine the specific concentration of the organic functional groups (in mmolg−1 of material). ATR-IR spectroscopy in a specially constructed reactor cell was applied as wet methodology to determine the chemically available amount of such functional groups, showing that the materials possess largely different loading capacity, with a variability of up to 70% in the chemical availability of the organic functional group. The amount of (3-aminopropyl)trimethoxysilane used for functionalization was optimized, thus reaching a saturation limit characteristic of the material. [Copyright &y& Elsevier]
Copyright of Applied Surface Science is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 57296445
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PubTypeId: academicJournal
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  Label: Title
  Group: Ti
  Data: Structural dependence of the efficiency of functionalization of silica-coated FeO<subscript> x </subscript> magnetic nanoparticles studied by ATR-IR
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  Data: <searchLink fieldCode="AR" term="%22Vargas%2C+Angelo%22">Vargas, Angelo</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Shnitko%2C+Ivan%22">Shnitko, Ivan</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Teleki%2C+Alexandra%22">Teleki, Alexandra</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Weyeneth%2C+Stephen%22">Weyeneth, Stephen</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Pratsinis%2C+Sotiris+E%2E%22">Pratsinis, Sotiris E.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Baiker%2C+Alfons%22">Baiker, Alfons</searchLink><relatesTo>1</relatesTo><i> baiker@chem.ethz.ch</i>
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  Data: <searchLink fieldCode="JN" term="%22Applied+Surface+Science%22">Applied Surface Science</searchLink>. Jan2011, Vol. 257 Issue 7, p2861-2869. 9p.
– Name: Subject
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  Data: <searchLink fieldCode="DE" term="%22Silica%22">Silica</searchLink><br /><searchLink fieldCode="DE" term="%22Iron+oxides%22">Iron oxides</searchLink><br /><searchLink fieldCode="DE" term="%22Nanoparticles%22">Nanoparticles</searchLink><br /><searchLink fieldCode="DE" term="%22Infrared+spectroscopy%22">Infrared spectroscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Precipitation+%28Chemistry%29%22">Precipitation (Chemistry)</searchLink><br /><searchLink fieldCode="DE" term="%22Aerosols%22">Aerosols</searchLink><br /><searchLink fieldCode="DE" term="%22Propanols%22">Propanols</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: Abstract: The efficiency of propylamino functionalization of magnetic silica-coated FeO x nanoparticles prepared by different methods, including coprecipitation and flame aerosol synthesis, has been evaluated by attenuated total reflection infrared spectroscopy (ATR-IR) combined with a specific surface reaction, thus revealing the availability of the grafted functional groups. Large differences in the population of reactive groups were observed for the investigated materials, underlining the tight relation between the structure of nanoparticles and their suitability for organic functionalization. The materials possessed different core structure, surface area, and porosity, as evidenced by transmission electron microscopy and nitrogen adsorption–desorption isotherms. Grafting of aminopropyl groups using a standard procedure based on reaction with (3-aminopropyl)trimethoxysilane as source of the propylamino groups was performed, followed by classical dry analysis methods to determine the specific concentration of the organic functional groups (in mmolg−1 of material). ATR-IR spectroscopy in a specially constructed reactor cell was applied as wet methodology to determine the chemically available amount of such functional groups, showing that the materials possess largely different loading capacity, with a variability of up to 70% in the chemical availability of the organic functional group. The amount of (3-aminopropyl)trimethoxysilane used for functionalization was optimized, thus reaching a saturation limit characteristic of the material. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of Applied Surface Science is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1016/j.apsusc.2010.10.081
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      – Code: eng
        Text: English
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        PageCount: 9
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      – SubjectFull: Silica
        Type: general
      – SubjectFull: Iron oxides
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      – SubjectFull: Nanoparticles
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      – SubjectFull: Precipitation (Chemistry)
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      – SubjectFull: Aerosols
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      – SubjectFull: Propanols
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      – TitleFull: Structural dependence of the efficiency of functionalization of silica-coated FeO x magnetic nanoparticles studied by ATR-IR
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              Text: Jan2011
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              Y: 2011
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              Value: 257
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