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Measurement of Particle Size Distribution in Turbid Solutions by Dynamic Light Scattering Microscopy
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Monitoring Silane Sol-Gel Kinetics with In-Situ Optical Turbidity Scanning and Dynamic Light Scattering.

Abul Bashar Mohammad Giasuddin1, David W Britt2

  • 1Department of Biological Engineering, Utah State University, Logan, UT 84322-4105, USA.

Molecules (Basel, Switzerland)
|August 16, 2019
PubMed
Summary
This summary is machine-generated.

Organosilane hydrolysis and condensation kinetics were studied using phase separation and turbidity scanning. Fluorinated organosilanes exhibit distinct reaction pathways compared to their non-fluorinated counterparts due to electronic effects.

Keywords:
ORMOSILTurbiscanaqueous sol-gel synthesisfluorosilanehydrophobic nanoparticleorganosilane

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Polymer Chemistry

Background:

  • Organosilanes offer hydrophobic properties for coatings, gels, and particles.
  • The R' group on organosilanes influences reaction kinetics and assembly mechanisms.
  • Understanding these properties is crucial for designing advanced materials.

Purpose of the Study:

  • To investigate the hydrolysis and condensation of n-propyltrimethoxy silane (nPM) and 3,3,3-trifluoropropyl trimethoxy silane (3F).
  • To compare the reaction kinetics of nPM and 3F under varying pH conditions.
  • To explore the impact of fluorination on organosilane assembly.

Main Methods:

  • Utilized macroscopic phase separation of silanes from aqueous solutions.
  • Employed Turbiscan instrument for in-situ monitoring of hydrolysis and condensation via turbidity.
  • Applied dynamic light scattering to confirm particle aggregation and condensation processes.

Main Results:

  • Phase separation enabled controlled reaction kinetics by manipulating interfacial area.
  • Distinct hydrolysis and condensation rates were observed for nPM and 3F.
  • Differences in kinetics were attributed to the electron-withdrawing (3F) and electron-donating (nPM) side chains.

Conclusions:

  • Macroscopic phase separation is an effective method for controlling organosilane reaction kinetics.
  • Fluorination significantly alters the hydrolysis and condensation pathways of organosilanes.
  • The electronic nature of the R' group is a key determinant of organosilane assembly behavior.