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Journal of Nanomaterials
Volume 2012, Article ID 980541, 15 pages
Research Article

Preparation, Properties, and Self-Assembly Behavior of PTFE-Based Core-Shell Nanospheres

1Dipartimento di Scienze dell’ Ambiente e della Vita, Università del Piemonte Orientale “A. Avogadro”, INSTM, UdR Alessandria, Via G. Bellini 25 g, 15100 Alessandria, Italy
2Dipartimento di Biochimica “G. Moruzzi”, Università di Bologna, INSTM, CNRNANO-S3, Via Irnerio 48, 40126 Bologna, Italy
3NanoFacility Piemonte, Electromagnetism Division, Istituto Nazionale di Ricerca Metrologica Strada delle Cacce 91, 10135 Torino, Italy
4Dipartimento di Chimica e Chimica Industriale, Università degli Studi di Genova, Via Dodecaneso 31, 16146 Genova, Italy

Received 2 August 2011; Revised 17 October 2011; Accepted 24 October 2011

Academic Editor: Hai-Sheng Qian

Copyright © 2012 Katia Sparnacci et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Nanosized PTFE-based core-shell particles can be prepared by emulsifier-free seed emulsion polymerization technique starting from spherical or rod-like PTFE seeds of different size. The shell can be constituted by the relatively high Tg polystyrene and polymethylmethacrylate as well as by low Tg polyacrylic copolymers. Peculiar thermal behavior of the PTFE component is observed due to the high degree of PTFE compartmentalization. A very precise control over the particle size can be exerted by properly adjusting the ratio between the monomers and the PTFE seed. In addition, the particle size distribution self-sharpens as the ratio monomer/PTFE increases. Samples with uniformity ratios suited to build 2D and 3D colloidal crystals are easily prepared. In particular, 2D colloidal crystal of spheres leads to very small 2D nanostructuration, useful for the preparation of masks with a combination of nanosphere lithography and reactive ion etching. 3D colloidal crystals were also obtained featuring excellent opal quality, which is a direct consequence of the monodispersity of colloids used for their growth.