Gold nanoparticles in melting gels

S. Kallontzi, Laura Fabris, M. Jitianu, A. Hernandez, A. Jitianu, L. C. Klein

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Abstract: Melting gels were prepared by the sol–gel process from methyltriethoxysilane (MTES) and dimethyldiethoxysilane (DMDES). Two compositions, 75 mol% MTES-25 mol% DMDES and 65 mol% MTES–35 mol% DMDES, were compared. Citrate-capped gold nanospheres were added to the melting gels during the synthesis process in five concentrations 8, 10, 12, 14, and 18 nM. The doped melting gels were studied both before and after their consolidation into hybrid glasses. Oscillatory rheometry and differential scanning calorimetry were employed to determine glass transition temperatures of the gels. According to oscillatory rheometry performed at constant frequency, the gels initially behave as viscous fluids and this continues as temperature is decreased, while recording the evolution of both storage G’(t,ω 0 ) and loss G” (t,ω 0 ) moduli with temperature. Glass transition temperature was determined as the moduli crossover point. Viscosity was dependent on temperature, but showed little variation with stress. As a general trend, viscosity decreased in the doped gels when compared to the undoped gel. UV–Vis spectra were collected to verify the presence of the gold nanospheres and to monitor their size. For the consolidated samples the position of the plasmon peak reflected the interaction between the gold nanospheres and the hybrid glass matrix. [Figure not available: see fulltext.].

Original languageEnglish
JournalJournal of Sol-Gel Science and Technology
DOIs
Publication statusPublished - Jan 1 2019

Fingerprint

Gold
Melting
Gels
melting
gels
gold
Nanoparticles
nanoparticles
Nanospheres
glass transition temperature
Viscosity
viscosity
Glass
glass
consolidation
viscous fluids
citrates
Citric Acid
Consolidation
Temperature

Keywords

  • Doped-hybrid glasses
  • Gold nanoparticles
  • Gold nanospheres
  • Melting gels
  • Plasmon resonance
  • Rotational viscometry

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Chemistry(all)
  • Biomaterials
  • Condensed Matter Physics
  • Materials Chemistry

Cite this

Gold nanoparticles in melting gels. / Kallontzi, S.; Fabris, Laura; Jitianu, M.; Hernandez, A.; Jitianu, A.; Klein, L. C.

In: Journal of Sol-Gel Science and Technology, 01.01.2019.

Research output: Contribution to journalArticle

Kallontzi, S. ; Fabris, Laura ; Jitianu, M. ; Hernandez, A. ; Jitianu, A. ; Klein, L. C. / Gold nanoparticles in melting gels. In: Journal of Sol-Gel Science and Technology. 2019.
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AB - Abstract: Melting gels were prepared by the sol–gel process from methyltriethoxysilane (MTES) and dimethyldiethoxysilane (DMDES). Two compositions, 75 mol% MTES-25 mol% DMDES and 65 mol% MTES–35 mol% DMDES, were compared. Citrate-capped gold nanospheres were added to the melting gels during the synthesis process in five concentrations 8, 10, 12, 14, and 18 nM. The doped melting gels were studied both before and after their consolidation into hybrid glasses. Oscillatory rheometry and differential scanning calorimetry were employed to determine glass transition temperatures of the gels. According to oscillatory rheometry performed at constant frequency, the gels initially behave as viscous fluids and this continues as temperature is decreased, while recording the evolution of both storage G’(t,ω 0 ) and loss G” (t,ω 0 ) moduli with temperature. Glass transition temperature was determined as the moduli crossover point. Viscosity was dependent on temperature, but showed little variation with stress. As a general trend, viscosity decreased in the doped gels when compared to the undoped gel. UV–Vis spectra were collected to verify the presence of the gold nanospheres and to monitor their size. For the consolidated samples the position of the plasmon peak reflected the interaction between the gold nanospheres and the hybrid glass matrix. [Figure not available: see fulltext.].

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