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Interfacial Activity of Amine‐Functionalized Polyhedral Oligomeric Silsesquioxanes (POSS): A Simple Strategy To Structure Liquids

Journal Article · · Angewandte Chemie
 [1];  [1];  [2];  [3];  [2];  [2];  [4];  [5]
  1. School of Chemistry &, Chemical Engineering State Key Laboratory for Metal Matrix Composite Materials Shanghai Jiao Tong University Shanghai 200240 China, Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA, Polymer Science and Engineering Department University of Massachusetts Amherst MA 01003 USA
  2. School of Chemistry &, Chemical Engineering State Key Laboratory for Metal Matrix Composite Materials Shanghai Jiao Tong University Shanghai 200240 China
  3. Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
  4. Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA, The Molecular Foundry Lawrence Berkeley National Laboratory One Cyclotron Road Berkeley CA 94720 USA
  5. Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA, Polymer Science and Engineering Department University of Massachusetts Amherst MA 01003 USA, Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology Beijing 100029 China
Abstract

Amine‐functionalized polyhedral oligomeric silsesquioxane (POSS), the smallest, monodisperse cage‐shaped silica cubic nanoparticle, is exceptionally interfacially active and can form assemblies that jam the toluene/water interface, locking in non‐equilibrium shapes of one liquid phase in another. The packing density of the amine‐functionalized POSS assembly at the water/toluene interface can be tuned by varying the concentration, the pH value, and the degree of POSS functionalization. Functionalized POSS gives a higher interface coverage, and hence a lower interfacial tension, than nanoparticle surfactants formed by interactions between functionalized nanoparticles and polymeric ligands. Hydrogen‐bonded POSS surfactants are more stable at the interface, offering some unique advantages for generating Pickering emulsions over typical micron‐sized colloidal particles and ligand‐stabilized nanoparticle surfactants.

Sponsoring Organization:
USDOE
OSTI ID:
1560218
Journal Information:
Angewandte Chemie, Journal Name: Angewandte Chemie Journal Issue: 30 Vol. 131; ISSN 0044-8249
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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