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Updated: May 23, 2026

High Resolution Physical Characterization of Single Metallic Nanoparticles
Published on: June 28, 2019
Quantitative structural characterization of POSS and octavinyl-POSS nanocomposites by solid state NMR
Huipeng Zhao1, Jie Shu, Qun Chen
1Shanghai Key Laboratory of Magnetic Resonance, Department of Physics, East China Normal University, Shanghai 200062, China.
Quantitative cross polarization (QCP) in solid-state NMR accurately determines silicon ratios in Polyhedral Oligomeric Silsesquioxane (POSS). This efficient NMR method also quantifies vinyl groups in POSS nanocomposites.
Area of Science:
- Materials Science
- Analytical Chemistry
- Solid-State NMR Spectroscopy
Background:
- Polyhedral Oligomeric Silsesquioxane (POSS) is a versatile nanomaterial with tunable properties.
- Accurate characterization of silicon-containing structures is crucial for material development.
- Existing methods for quantifying specific functional groups in POSS can be time-consuming or indirect.
Purpose of the Study:
- To develop and validate an efficient solid-state NMR method for quantitative analysis of POSS.
- To determine the ratio of different silicon (29Si) atoms in chloromethylphenyl isobutyl POSS.
- To accurately quantify reacted vinyl groups in octavinyl-POSS nanocomposites.
Main Methods:
- Quantitative Cross Polarization (QCP) solid-state NMR was employed.
- Optimized cross-polarization and depolarization with reciprocity relations were utilized for (29)Si/(1)H spin systems.
- The method was applied to both neat POSS and POSS-perfluoropolyether nanocomposites.
Main Results:
- The ratio of different (29)Si atoms in chloromethylphenyl isobutyl POSS was accurately determined.
- The average number of reacted vinyl groups in octavinyl-POSS nanocomposites was directly and accurately derived.
- The QCP method demonstrated significant time savings compared to direct polarization NMR experiments.
Conclusions:
- Quantitative Cross Polarization (QCP) solid-state NMR is a valuable technique for the precise characterization of silicon-based materials.
- This NMR approach offers a more direct and efficient alternative to conventional methods for analyzing POSS structures and functionalization.
- The developed method has broad applicability for quantitative analysis of silicon-related structures in bulk materials.
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