Skip to main content
eScholarship
Open Access Publications from the University of California

Uniform Concave Polystyrene-Carbon Core-Shell Nanospheres by a Swelling Induced Buckling Process

  • Author(s): Liu, D
  • Peng, X
  • Wu, B
  • Zheng, X
  • Chuong, TT
  • Li, J
  • Sun, S
  • Stucky, GD
  • et al.

Published Web Location

http://dx.doi.org/10.1021/jacs.5b05027
No data is associated with this publication.
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Public License
Abstract

© 2015 American Chemical Society. We have developed a facile procedure that can create asymmetrical building blocks by uniformly deforming nanospheres into C∞ν symmetry at low cost and high quality. Concave polystyrene@carbon (PS@C) core-shell nanospheres were produced by a very simple microwave-assisted alcohol thermal treatment of spherical PS@C nanoparticles. The dimensions and ratio of the concave part can be precisely controlled by temperature and solvents. The concavity is created by varying the alcohol-thermal treatment to tune the swelling properties that lead to the mechanical deformation of the PS@C core-shell structure. The driving force is attributed to the significant volume increase that occurs upon polystyrene core swelling with the incorporation of solvent. We propose a mechanism adapted from published models for the depression of soft capsules. An extrapolation from this model predicts that the rigid shell is used to generate a cavity in the unbuckled shell, which is experimentally confirmed. This swelling and deformation route is flexible and should be applicable to other polymeric nanoparticles to produce asymmetrical nanoparticles.

Many UC-authored scholarly publications are freely available on this site because of the UC Academic Senate's Open Access Policy. Let us know how this access is important for you.

Item not freely available? Link broken?
Report a problem accessing this item